use itertools::Itertools;
mod metadata;
mod serde_verbatim;
mod settings;
mod source_dist;
mod wheel;

pub use metadata::{PyProjectToml, check_direct_build};
pub use settings::{BuildBackendSettings, WheelDataIncludes};
pub use source_dist::{build_source_dist, list_source_dist};
use uv_warnings::warn_user_once;
pub use wheel::{build_editable, build_wheel, list_wheel, metadata};

use rustc_hash::FxHashSet;
use std::collections::HashSet;
use std::ffi::OsStr;
use std::io;
use std::path::{Path, PathBuf};
use std::str::FromStr;
use thiserror::Error;
use tracing::debug;

use uv_fs::{Simplified, normalize_path};
use uv_globfilter::PortableGlobError;
use uv_normalize::PackageName;
use uv_pypi_types::{Identifier, IdentifierParseError};

use crate::metadata::ValidationError;
use crate::settings::ModuleName;

#[derive(Debug, Error)]
pub enum Error {
    #[error(transparent)]
    Io(#[from] io::Error),
    #[error("Failed to persist temporary file to {}", _0.user_display())]
    Persist(PathBuf, #[source] io::Error),
    #[error("Invalid metadata format in: {}", _0.user_display())]
    Toml(PathBuf, #[source] toml::de::Error),
    #[error("Failed to serialize pyproject.toml")]
    TomlSerialize(#[source] toml::ser::Error),
    #[error("Invalid project metadata")]
    Validation(#[from] ValidationError),
    #[error("Invalid module name: {0}")]
    InvalidModuleName(String, #[source] IdentifierParseError),
    #[error("Unsupported glob expression in: {field}")]
    PortableGlob {
        field: String,
        #[source]
        source: PortableGlobError,
    },
    /// <https://github.com/BurntSushi/ripgrep/discussions/2927>
    #[error("Glob expressions caused to large regex in: {field}")]
    GlobSetTooLarge {
        field: String,
        #[source]
        source: globset::Error,
    },
    #[error("`pyproject.toml` must not be excluded from source distribution build")]
    PyprojectTomlExcluded,
    #[error("Failed to walk source tree: {}", root.user_display())]
    WalkDir {
        root: PathBuf,
        #[source]
        err: walkdir::Error,
    },
    #[error("Failed to write wheel zip archive")]
    AsyncZip(#[from] async_zip::error::ZipError),
    #[error("Failed to write RECORD file")]
    Csv(#[from] csv::Error),
    #[error("Failed to write JSON metadata file")]
    Json(#[source] serde_json::Error),
    #[error("Expected a Python module at: {}", _0.user_display())]
    MissingInitPy(PathBuf),
    #[error("For namespace packages, `__init__.py[i]` is not allowed in parent directory: {}", _0.user_display())]
    NotANamespace(PathBuf),
    /// Either an absolute path or a parent path through `..`.
    #[error("Module root must be inside the project: {}", _0.user_display())]
    InvalidModuleRoot(PathBuf),
    /// Either an absolute path or a parent path through `..`.
    #[error("The path for the data directory {} must be inside the project: {}", name, path.user_display())]
    InvalidDataRoot { name: String, path: PathBuf },
    #[error("Virtual environments must not be added to source distributions or wheels, remove the directory or exclude it from the build: {}", _0.user_display())]
    VenvInSourceTree(PathBuf),
    #[error("Inconsistent metadata between prepare and build step: {0}")]
    InconsistentSteps(&'static str),
    #[error("Failed to write to {}", _0.user_display())]
    TarWrite(PathBuf, #[source] io::Error),
}

impl uv_errors::Hint for Error {
    fn hints(&self) -> uv_errors::Hints<'_> {
        match self {
            Self::PortableGlob { source, .. } => uv_errors::Hint::hints(source),
            _ => uv_errors::Hints::none(),
        }
    }
}

/// Dispatcher between writing to a directory, writing to a zip, writing to a `.tar.gz` and
/// listing files.
///
/// All paths are string types instead of path types since wheels are portable between platforms.
///
/// Contract: You must call close before dropping to obtain a valid output (dropping is fine in the
/// error case).
trait DirectoryWriter {
    /// Add a file with the given content.
    ///
    /// Files added through the method are considered generated when listing included files.
    fn write_bytes(&mut self, path: &str, bytes: &[u8]) -> Result<(), Error>;

    /// Add a local file.
    fn write_file(&mut self, path: &str, file: &Path) -> Result<(), Error>;

    /// Create a directory.
    fn write_directory(&mut self, directory: &str) -> Result<(), Error>;

    /// Write the `RECORD` file and if applicable, the central directory.
    fn close(self, dist_info_dir: &str) -> Result<(), Error>;
}

fn write_directory_once(
    writer: &mut impl DirectoryWriter,
    directories: &mut FxHashSet<PathBuf>,
    directory: &Path,
) -> Result<(), Error> {
    if directories.insert(directory.to_path_buf()) {
        debug!("Adding directory: {}", directory.user_display());
        writer.write_directory(&directory.portable_display().to_string())?;
    }
    Ok(())
}

fn write_file_with_directories(
    writer: &mut impl DirectoryWriter,
    directories: &mut FxHashSet<PathBuf>,
    prefix: &Path,
    relative: &Path,
    source: &Path,
) -> Result<(), Error> {
    if let Some(parent) = relative.parent() {
        let mut directory = PathBuf::new();
        for component in parent.components() {
            directory.push(component);
            write_directory_once(writer, directories, &prefix.join(&directory))?;
        }
    }

    let entry_path = prefix.join(relative).portable_display().to_string();
    writer.write_file(&entry_path, source)
}

/// Name of the file in the archive and path outside, if it wasn't generated.
pub(crate) type FileList = Vec<(String, Option<PathBuf>)>;

/// A dummy writer to collect the file names that would be included in a build.
pub(crate) struct ListWriter<'a> {
    files: &'a mut FileList,
}

impl<'a> ListWriter<'a> {
    /// Convert the writer to the collected file names.
    pub(crate) fn new(files: &'a mut FileList) -> Self {
        Self { files }
    }
}

impl DirectoryWriter for ListWriter<'_> {
    fn write_bytes(&mut self, path: &str, _bytes: &[u8]) -> Result<(), Error> {
        self.files.push((path.to_string(), None));
        Ok(())
    }

    fn write_file(&mut self, path: &str, file: &Path) -> Result<(), Error> {
        self.files
            .push((path.to_string(), Some(file.to_path_buf())));
        Ok(())
    }

    fn write_directory(&mut self, _directory: &str) -> Result<(), Error> {
        Ok(())
    }

    fn close(self, _dist_info_dir: &str) -> Result<(), Error> {
        Ok(())
    }
}

/// PEP 517 requires that the metadata directory from the prepare metadata call is identical to the
/// build wheel call. This method performs a prudence check that `METADATA` and `entry_points.txt`
/// match.
fn check_metadata_directory(
    source_tree: &Path,
    metadata_directory: Option<&Path>,
    pyproject_toml: &PyProjectToml,
) -> Result<(), Error> {
    let Some(metadata_directory) = metadata_directory else {
        return Ok(());
    };

    debug!(
        "Checking metadata directory {}",
        metadata_directory.user_display()
    );

    // `METADATA` is a mandatory file.
    let current = pyproject_toml
        .to_metadata(source_tree)?
        .core_metadata_format();
    let previous = fs_err::read_to_string(metadata_directory.join("METADATA"))?;
    if previous != current {
        return Err(Error::InconsistentSteps("METADATA"));
    }

    // `entry_points.txt` is not written if it would be empty.
    let entrypoints_path = metadata_directory.join("entry_points.txt");
    match pyproject_toml.to_entry_points()? {
        None => {
            if entrypoints_path.is_file() {
                return Err(Error::InconsistentSteps("entry_points.txt"));
            }
        }
        Some(entrypoints) => {
            if fs_err::read_to_string(&entrypoints_path)? != entrypoints {
                return Err(Error::InconsistentSteps("entry_points.txt"));
            }
        }
    }

    Ok(())
}

/// Returns the list of module names without names which would be included twice
///
/// In normal cases it should do nothing:
///
/// * `["aaa"] -> ["aaa"]`
/// * `["aaa", "bbb"] -> ["aaa", "bbb"]`
///
/// Duplicate elements are removed:
///
/// * `["aaa", "aaa"] -> ["aaa"]`
/// * `["bbb", "aaa", "bbb"] -> ["aaa", "bbb"]`
///
/// Names with more specific paths are removed in favour of more general paths:
///
/// * `["aaa.foo", "aaa"] -> ["aaa"]`
/// * `["bbb", "aaa", "bbb.foo", "ccc.foo", "ccc.foo.bar", "aaa"] -> ["aaa", "bbb.foo", "ccc.foo"]`
///
/// This does not preserve the order of the elements.
fn prune_redundant_modules(mut names: Vec<String>) -> Vec<String> {
    names.sort();
    let mut pruned = Vec::with_capacity(names.len());
    for name in names {
        if let Some(last) = pruned.last() {
            if name == *last {
                continue;
            }
            // This is a more specific (narrow) module name than what came before
            if name
                .strip_prefix(last)
                .is_some_and(|suffix| suffix.starts_with('.'))
            {
                continue;
            }
        }
        pruned.push(name);
    }
    pruned
}

/// Wraps [`prune_redundant_modules`] with a conditional warning when modules are ignored
fn prune_redundant_modules_warn(names: &[String], show_warnings: bool) -> Vec<String> {
    let pruned = prune_redundant_modules(names.to_vec());
    if show_warnings && names.len() != pruned.len() {
        let mut pruned: HashSet<_> = pruned.iter().collect();
        let ignored: Vec<_> = names.iter().filter(|name| !pruned.remove(name)).collect();
        let s = if ignored.len() == 1 { "" } else { "s" };
        warn_user_once!(
            "Ignoring redundant module name{s} in `tool.uv.build-backend.module-name`: `{}`",
            ignored.into_iter().join("`, `")
        );
    }
    pruned
}

/// Returns the source root and the module path(s) with the `__init__.py[i]`  below to it while
/// checking the project layout and names.
///
/// Some target platforms have case-sensitive filesystems, while others have case-insensitive
/// filesystems. We always lower case the package name, our default for the module, while some
/// users want uppercase letters in their module names. For example, the package name is `pil_util`,
/// but the module `PIL_util`. To make the behavior as consistent as possible across platforms as
/// possible, we require that an upper case name is given explicitly through
/// `tool.uv.build-backend.module-name`.
///
/// By default, the dist-info-normalized package name is the module name. For
/// dist-info-normalization, the rules are lowercasing, replacing `.` with `_` and
/// replace `-` with `_`. Since `.` and `-` are not allowed in identifiers, we can use a string
/// comparison with the module name.
///
/// While we recommend one module per package, it is possible to declare a list of modules.
fn find_roots(
    source_tree: &Path,
    pyproject_toml: &PyProjectToml,
    relative_module_root: &Path,
    module_name: Option<&ModuleName>,
    namespace: bool,
    show_warnings: bool,
) -> Result<(PathBuf, Vec<PathBuf>), Error> {
    let relative_module_root = normalize_path(relative_module_root);
    // Check that even if a path contains `..`, we only include files below the module root.
    let src_root = source_tree.join(&relative_module_root);
    if !normalize_path(&src_root).starts_with(normalize_path(source_tree)) {
        return Err(Error::InvalidModuleRoot(relative_module_root.to_path_buf()));
    }
    debug!("Source root: {}", src_root.user_display());

    if namespace {
        // `namespace = true` disables module structure checks.
        let modules_relative = if let Some(module_name) = module_name {
            match module_name {
                ModuleName::Name(name) => {
                    vec![name.split('.').collect::<PathBuf>()]
                }
                ModuleName::Names(names) => prune_redundant_modules_warn(names, show_warnings)
                    .into_iter()
                    .map(|name| name.split('.').collect::<PathBuf>())
                    .collect(),
            }
        } else {
            vec![PathBuf::from(
                pyproject_toml.name().as_dist_info_name().to_string(),
            )]
        };
        for module_relative in &modules_relative {
            debug!("Namespace module path: {}", module_relative.user_display());
        }
        return Ok((src_root, modules_relative));
    }

    let modules_relative = if let Some(module_name) = module_name {
        match module_name {
            ModuleName::Name(name) => vec![module_path_from_module_name(&src_root, name)?],
            ModuleName::Names(names) => prune_redundant_modules_warn(names, show_warnings)
                .into_iter()
                .map(|name| module_path_from_module_name(&src_root, &name))
                .collect::<Result<_, _>>()?,
        }
    } else {
        vec![find_module_path_from_package_name(
            &src_root,
            pyproject_toml.name(),
        )?]
    };
    for module_relative in &modules_relative {
        debug!("Module path: {}", module_relative.user_display());
    }
    Ok((src_root, modules_relative))
}

/// Infer stubs packages from package name alone.
///
/// There are potential false positives if someone had a regular package with `-stubs`.
/// The `Identifier` checks in `module_path_from_module_name` are here covered by the `PackageName`
/// validation.
fn find_module_path_from_package_name(
    src_root: &Path,
    package_name: &PackageName,
) -> Result<PathBuf, Error> {
    if let Some(stem) = package_name.to_string().strip_suffix("-stubs") {
        debug!("Building stubs package instead of a regular package");
        let module_name = PackageName::from_str(stem)
            .expect("non-empty package name prefix must be valid package name")
            .as_dist_info_name()
            .to_string();
        let module_relative = PathBuf::from(format!("{module_name}-stubs"));
        let init_pyi = src_root.join(&module_relative).join("__init__.pyi");
        if !init_pyi.is_file() {
            return Err(Error::MissingInitPy(init_pyi));
        }
        Ok(module_relative)
    } else {
        // This name is always lowercase.
        let module_relative = PathBuf::from(package_name.as_dist_info_name().to_string());
        let init_py = src_root.join(&module_relative).join("__init__.py");
        if !init_py.is_file() {
            return Err(Error::MissingInitPy(init_py));
        }
        Ok(module_relative)
    }
}

/// Determine the relative module path from an explicit module name.
fn module_path_from_module_name(src_root: &Path, module_name: &str) -> Result<PathBuf, Error> {
    // This name can be uppercase.
    let module_relative = module_name.split('.').collect::<PathBuf>();

    // Check if we have a regular module or a namespace.
    let (root_name, namespace_segments) =
        if let Some((root_name, namespace_segments)) = module_name.split_once('.') {
            (
                root_name,
                namespace_segments.split('.').collect::<Vec<&str>>(),
            )
        } else {
            (module_name, Vec::new())
        };

    // Check if we have an implementation or a stubs package.
    // For stubs for a namespace, the `-stubs` prefix must be on the root.
    let stubs = if let Some(stem) = root_name.strip_suffix("-stubs") {
        // Check that the stubs belong to a valid module.
        Identifier::from_str(stem)
            .map_err(|err| Error::InvalidModuleName(module_name.to_string(), err))?;
        true
    } else {
        Identifier::from_str(root_name)
            .map_err(|err| Error::InvalidModuleName(module_name.to_string(), err))?;
        false
    };

    // For a namespace, check that all names below the root is valid.
    for segment in namespace_segments {
        Identifier::from_str(segment)
            .map_err(|err| Error::InvalidModuleName(module_name.to_string(), err))?;
    }

    // Check that an `__init__.py[i]` exists for the module.
    let init_py =
        src_root
            .join(&module_relative)
            .join(if stubs { "__init__.pyi" } else { "__init__.py" });
    if !init_py.is_file() {
        return Err(Error::MissingInitPy(init_py));
    }

    // For a namespace, check that the directories above the lowest are namespace directories.
    for namespace_dir in module_relative.ancestors().skip(1) {
        if src_root.join(namespace_dir).join("__init__.py").exists()
            || src_root.join(namespace_dir).join("__init__.pyi").exists()
        {
            return Err(Error::NotANamespace(src_root.join(namespace_dir)));
        }
    }

    Ok(module_relative)
}

/// Error if we're adding a venv to a distribution.
pub(crate) fn error_on_venv(file_name: &OsStr, path: &Path) -> Result<(), Error> {
    // On 64-bit Unix, `lib64` is a (compatibility) symlink to lib. If we traverse `lib64` before
    // `pyvenv.cfg`, we show a generic error for symlink directories instead.
    if !(file_name == "pyvenv.cfg" || file_name == "lib64") {
        return Ok(());
    }

    let Some(parent) = path.parent() else {
        return Ok(());
    };

    if parent.join("bin").join("python").is_symlink()
        || parent.join("Scripts").join("python.exe").is_file()
    {
        return Err(Error::VenvInSourceTree(parent.to_path_buf()));
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use async_zip::base::read::mem::ZipFileReader;
    use flate2::bufread::GzDecoder;
    use fs_err::File;
    use futures_lite::{StreamExt, future::block_on};
    use indoc::indoc;
    use insta::assert_snapshot;
    use itertools::Itertools;
    use regex::Regex;
    use sha2::Digest;
    use std::io::BufReader;
    use std::iter;
    use std::pin::Pin;
    use tempfile::TempDir;
    use uv_distribution_filename::{SourceDistFilename, WheelFilename};
    use uv_errors::{ErrorWithHints, Hint};
    use uv_fs::{copy_dir_all, relative_to};
    use uv_preview::PreviewFeature;

    use crate::source_dist::SyncReader;

    const MOCK_UV_VERSION: &str = "1.0.0+test";

    fn format_err(err: &Error) -> String {
        let context = iter::successors(std::error::Error::source(&err), |&err| err.source())
            .map(|err| format!("  Caused by: {err}"))
            .join("\n");
        let formatted = err.to_string() + "\n" + &context;
        let formatted = ErrorWithHints::new(formatted, err.hints()).to_string();
        anstream::adapter::strip_str(&formatted).to_string()
    }

    #[test]
    fn format_err_renders_portable_glob_hints() {
        let err = Error::PortableGlob {
            field: "tool.uv.build-backend.source-include".to_string(),
            source: uv_globfilter::PortableGlobParser::Uv
                .parse("**/@test")
                .unwrap_err(),
        };

        assert_snapshot!(format_err(&err), @r#"
        Unsupported glob expression in: tool.uv.build-backend.source-include
          Caused by: Invalid character `@` at position 3 in glob: `**/@test`

        hint: Characters can be escaped with a backslash
        "#);
    }

    /// File listings, generated archives and archive contents for both a build with
    /// source tree -> wheel
    /// and a build with
    /// source tree -> source dist -> wheel.
    #[derive(Debug, PartialEq, Eq)]
    struct BuildResults {
        source_dist_list_files: FileList,
        source_dist_filename: SourceDistFilename,
        source_dist_contents: Vec<String>,
        wheel_list_files: FileList,
        wheel_filename: WheelFilename,
        wheel_contents: Vec<String>,
    }

    /// Run both a direct wheel build and an indirect wheel build through a source distribution,
    /// while checking that directly built wheel and indirectly built wheel are the same.
    fn build(source_root: &Path, dist: &Path) -> Result<BuildResults, Error> {
        // Build a direct wheel, capture all its properties to compare it with the indirect wheel
        // latest and remove it since it has the same filename as the indirect wheel.
        let (_name, direct_wheel_list_files) = list_wheel(source_root, MOCK_UV_VERSION, false)?;
        let direct_wheel_filename = build_wheel(source_root, dist, None, MOCK_UV_VERSION, false)?;
        let direct_wheel_path = dist.join(direct_wheel_filename.to_string());
        let direct_wheel_contents = wheel_contents(&direct_wheel_path);
        let direct_wheel_hash = sha2::Sha256::digest(fs_err::read(&direct_wheel_path)?);
        fs_err::remove_file(&direct_wheel_path)?;

        // Build a source distribution.
        let (_name, source_dist_list_files) =
            list_source_dist(source_root, MOCK_UV_VERSION, false)?;
        // TODO(konsti): This should run in the unpacked source dist tempdir, but we need to
        // normalize the path.
        let (_name, wheel_list_files) = list_wheel(source_root, MOCK_UV_VERSION, false)?;
        let source_dist_filename = build_source_dist(source_root, dist, MOCK_UV_VERSION, false)?;
        let source_dist_path = dist.join(source_dist_filename.to_string());
        let source_dist_contents = sdist_contents(&source_dist_path);

        // Unpack the source distribution and build a wheel from it.
        let sdist_tree = TempDir::new()?;
        unpack_sdist(&source_dist_path, sdist_tree.path())?;
        let sdist_top_level_directory = sdist_tree.path().join(format!(
            "{}-{}",
            source_dist_filename.name.as_dist_info_name(),
            source_dist_filename.version
        ));
        let wheel_filename = build_wheel(
            &sdist_top_level_directory,
            dist,
            None,
            MOCK_UV_VERSION,
            false,
        )?;
        let wheel_contents = wheel_contents(&dist.join(wheel_filename.to_string()));

        // Check that direct and indirect wheels are identical.
        assert_eq!(direct_wheel_filename, wheel_filename);
        assert_eq!(direct_wheel_contents, wheel_contents);
        assert_eq!(direct_wheel_list_files, wheel_list_files);
        assert_eq!(
            direct_wheel_hash,
            sha2::Sha256::digest(fs_err::read(dist.join(wheel_filename.to_string()))?)
        );

        Ok(BuildResults {
            source_dist_list_files,
            source_dist_filename,
            source_dist_contents,
            wheel_list_files,
            wheel_filename,
            wheel_contents,
        })
    }

    fn build_err(source_root: &Path) -> String {
        let dist = TempDir::new().unwrap();
        let build_err = build(source_root, dist.path()).unwrap_err();
        let err_message: String = format_err(&build_err)
            .replace(&source_root.user_display().to_string(), "[TEMP_PATH]")
            .replace('\\', "/");
        err_message
    }

    fn sdist_contents(source_dist_path: &Path) -> Vec<String> {
        let sdist_reader = BufReader::new(File::open(source_dist_path).unwrap());
        let mut source_dist =
            tokio_tar::Archive::new(SyncReader::new(GzDecoder::new(sdist_reader)));
        let mut source_dist_contents = block_on(async {
            let mut entries = source_dist.entries().unwrap();
            let mut entries = Pin::new(&mut entries);
            let mut contents = Vec::new();
            while let Some(entry) = entries.next().await {
                contents.push(
                    entry
                        .unwrap()
                        .path()
                        .unwrap()
                        .to_str()
                        .unwrap()
                        .replace('\\', "/"),
                );
            }
            contents
        });
        source_dist_contents.sort();
        source_dist_contents
    }

    fn unpack_sdist(source_dist_path: &Path, target: &Path) -> Result<(), Error> {
        let sdist_reader = BufReader::new(File::open(source_dist_path)?);
        let mut source_dist =
            tokio_tar::Archive::new(SyncReader::new(GzDecoder::new(sdist_reader)));
        tokio::runtime::Builder::new_current_thread()
            .enable_all()
            .build()?
            .block_on(source_dist.unpack(target))?;
        Ok(())
    }

    fn wheel_contents(direct_output_dir: &Path) -> Vec<String> {
        let wheel = block_on(read_wheel(direct_output_dir));
        let mut wheel_contents: Vec<_> = wheel
            .file()
            .entries()
            .iter()
            .map(|entry| {
                entry
                    .filename()
                    .as_str()
                    .expect("wheel filenames should be UTF-8")
                    .replace('\\', "/")
            })
            .collect();
        wheel_contents.sort_unstable();
        wheel_contents
    }

    fn wheel_entry(wheel_path: &Path, filename: &str) -> String {
        block_on(async {
            let wheel = read_wheel(wheel_path).await;
            let index = wheel
                .file()
                .entries()
                .iter()
                .position(|entry| {
                    entry
                        .filename()
                        .as_str()
                        .is_ok_and(|entry_filename| entry_filename == filename)
                })
                .expect("wheel entry should exist");

            let mut reader = wheel
                .reader_with_entry(index)
                .await
                .expect("wheel entry should be readable");
            let mut contents = String::new();
            reader
                .read_to_string_checked(&mut contents)
                .await
                .expect("wheel entry should be valid UTF-8");
            contents
        })
    }

    async fn read_wheel(wheel_path: &Path) -> ZipFileReader {
        ZipFileReader::new(fs_err::read(wheel_path).expect("wheel should be readable"))
            .await
            .expect("wheel should be valid")
    }

    fn format_file_list(file_list: FileList, src: &Path) -> String {
        file_list
            .into_iter()
            .map(|(path, source)| {
                let path = path.replace('\\', "/");
                if let Some(source) = source {
                    let source = relative_to(source, src)
                        .unwrap()
                        .portable_display()
                        .to_string();
                    format!("{path} ({source})")
                } else {
                    format!("{path} (generated)")
                }
            })
            .join("\n")
    }

    /// Tests that builds are stable and include the right files and.
    ///
    /// Tests that both source tree -> source dist -> wheel and source tree -> wheel include the
    /// right files. Also checks that the resulting archives are byte-by-byte identical
    /// independent of the build path or platform, with the caveat that we cannot serialize an
    /// executable bit on Window. This ensures reproducible builds and best-effort
    /// platform-independent deterministic builds.
    #[test]
    fn built_by_uv_building() {
        let _preview = uv_preview::test::with_features(&[]);
        let built_by_uv = Path::new("../../test/packages/built-by-uv");
        let src = TempDir::new().unwrap();
        for dir in [
            "src",
            "tests",
            "data-dir",
            "third-party-licenses",
            "assets",
            "header",
            "scripts",
        ] {
            copy_dir_all(built_by_uv.join(dir), src.path().join(dir)).unwrap();
        }
        for filename in [
            "pyproject.toml",
            "README.md",
            "uv.lock",
            "LICENSE-APACHE",
            "LICENSE-MIT",
        ] {
            fs_err::copy(built_by_uv.join(filename), src.path().join(filename)).unwrap();
        }

        // Clear executable bit on Unix to build the same archive between Unix and Windows.
        // This is a caveat to the determinism of the uv build backend: When a file has the
        // executable in the source repository, it only has the executable bit on Unix, as Windows
        // does not have the concept of the executable bit.
        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let path = src.path().join("scripts").join("whoami.sh");
            let metadata = fs_err::metadata(&path).unwrap();
            let mut perms = metadata.permissions();
            perms.set_mode(perms.mode() & !0o111);
            fs_err::set_permissions(&path, perms).unwrap();
        }

        // Redact the uv_build version to keep the hash stable across releases
        let pyproject_toml = fs_err::read_to_string(src.path().join("pyproject.toml")).unwrap();
        let current_requires =
            Regex::new(r#"requires = \["uv_build>=[0-9.]+,<[0-9.]+"\]"#).unwrap();
        let mocked_requires = r#"requires = ["uv_build>=1,<2"]"#;
        let pyproject_toml = current_requires.replace(pyproject_toml.as_str(), mocked_requires);
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml.as_bytes()).unwrap();

        // Add some files to be excluded
        let module_root = src.path().join("src").join("built_by_uv");
        fs_err::create_dir_all(module_root.join("__pycache__")).unwrap();
        File::create(module_root.join("__pycache__").join("compiled.pyc")).unwrap();
        File::create(module_root.join("arithmetic").join("circle.pyc")).unwrap();
        fs_err::create_dir_all(module_root.join("empty")).unwrap();
        fs_err::create_dir_all(module_root.join("stale").join("__pycache__")).unwrap();
        File::create(
            module_root
                .join("stale")
                .join("__pycache__")
                .join("compiled.pyc"),
        )
        .unwrap();

        // Perform both the direct and the indirect build.
        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();

        let source_dist_path = dist.path().join(build.source_dist_filename.to_string());
        assert_eq!(
            build.source_dist_filename.to_string(),
            "built_by_uv-0.1.0.tar.gz"
        );
        // Check that the source dist is reproducible across platforms.
        assert_snapshot!(
            format!("{:x}", sha2::Sha256::digest(fs_err::read(&source_dist_path).unwrap())),
            @"8bed1f7a8059064bcbeedb61a867cca7f63a474306011d0114280de631ac705e"
        );
        // Check both the files we report and the actual files
        assert_snapshot!(format_file_list(build.source_dist_list_files, src.path()), @"
        built_by_uv-0.1.0/PKG-INFO (generated)
        built_by_uv-0.1.0/LICENSE-APACHE (LICENSE-APACHE)
        built_by_uv-0.1.0/LICENSE-MIT (LICENSE-MIT)
        built_by_uv-0.1.0/README.md (README.md)
        built_by_uv-0.1.0/assets/data.csv (assets/data.csv)
        built_by_uv-0.1.0/header/built_by_uv.h (header/built_by_uv.h)
        built_by_uv-0.1.0/pyproject.toml (pyproject.toml)
        built_by_uv-0.1.0/scripts/whoami.sh (scripts/whoami.sh)
        built_by_uv-0.1.0/src/built_by_uv/__init__.py (src/built_by_uv/__init__.py)
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/__init__.py (src/built_by_uv/arithmetic/__init__.py)
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/circle.py (src/built_by_uv/arithmetic/circle.py)
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/pi.txt (src/built_by_uv/arithmetic/pi.txt)
        built_by_uv-0.1.0/src/built_by_uv/build-only.h (src/built_by_uv/build-only.h)
        built_by_uv-0.1.0/src/built_by_uv/cli.py (src/built_by_uv/cli.py)
        built_by_uv-0.1.0/third-party-licenses/PEP-401.txt (third-party-licenses/PEP-401.txt)
        ");
        assert_snapshot!(build.source_dist_contents.iter().join("\n"), @"
        built_by_uv-0.1.0/
        built_by_uv-0.1.0/LICENSE-APACHE
        built_by_uv-0.1.0/LICENSE-MIT
        built_by_uv-0.1.0/PKG-INFO
        built_by_uv-0.1.0/README.md
        built_by_uv-0.1.0/assets
        built_by_uv-0.1.0/assets/data.csv
        built_by_uv-0.1.0/header
        built_by_uv-0.1.0/header/built_by_uv.h
        built_by_uv-0.1.0/pyproject.toml
        built_by_uv-0.1.0/scripts
        built_by_uv-0.1.0/scripts/whoami.sh
        built_by_uv-0.1.0/src
        built_by_uv-0.1.0/src/built_by_uv
        built_by_uv-0.1.0/src/built_by_uv/__init__.py
        built_by_uv-0.1.0/src/built_by_uv/arithmetic
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/__init__.py
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/circle.py
        built_by_uv-0.1.0/src/built_by_uv/arithmetic/pi.txt
        built_by_uv-0.1.0/src/built_by_uv/build-only.h
        built_by_uv-0.1.0/src/built_by_uv/cli.py
        built_by_uv-0.1.0/third-party-licenses
        built_by_uv-0.1.0/third-party-licenses/PEP-401.txt
        ");

        let wheel_path = dist.path().join(build.wheel_filename.to_string());
        assert_eq!(
            build.wheel_filename.to_string(),
            "built_by_uv-0.1.0-py3-none-any.whl"
        );
        // Check that the wheel is reproducible across platforms.
        assert_snapshot!(
            format!("{:x}", sha2::Sha256::digest(fs_err::read(&wheel_path).unwrap())),
            @"9e8d80fef76be79a7fe73a2ccac3bdd0132b10fdcff7271ca8b868c99061b8ce"
        );
        assert_snapshot!(build.wheel_contents.join("\n"), @"
        built_by_uv-0.1.0.data/data/
        built_by_uv-0.1.0.data/data/data.csv
        built_by_uv-0.1.0.data/headers/
        built_by_uv-0.1.0.data/headers/built_by_uv.h
        built_by_uv-0.1.0.data/scripts/
        built_by_uv-0.1.0.data/scripts/whoami.sh
        built_by_uv-0.1.0.dist-info/
        built_by_uv-0.1.0.dist-info/METADATA
        built_by_uv-0.1.0.dist-info/RECORD
        built_by_uv-0.1.0.dist-info/WHEEL
        built_by_uv-0.1.0.dist-info/entry_points.txt
        built_by_uv-0.1.0.dist-info/licenses/
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-APACHE
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-MIT
        built_by_uv-0.1.0.dist-info/licenses/third-party-licenses/
        built_by_uv-0.1.0.dist-info/licenses/third-party-licenses/PEP-401.txt
        built_by_uv/
        built_by_uv/__init__.py
        built_by_uv/arithmetic/
        built_by_uv/arithmetic/__init__.py
        built_by_uv/arithmetic/circle.py
        built_by_uv/arithmetic/pi.txt
        built_by_uv/cli.py
        ");
        assert_snapshot!(format_file_list(build.wheel_list_files, src.path()), @"
        built_by_uv/__init__.py (src/built_by_uv/__init__.py)
        built_by_uv/arithmetic/__init__.py (src/built_by_uv/arithmetic/__init__.py)
        built_by_uv/arithmetic/circle.py (src/built_by_uv/arithmetic/circle.py)
        built_by_uv/arithmetic/pi.txt (src/built_by_uv/arithmetic/pi.txt)
        built_by_uv/cli.py (src/built_by_uv/cli.py)
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-APACHE (LICENSE-APACHE)
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-MIT (LICENSE-MIT)
        built_by_uv-0.1.0.dist-info/licenses/third-party-licenses/PEP-401.txt (third-party-licenses/PEP-401.txt)
        built_by_uv-0.1.0.data/headers/built_by_uv.h (header/built_by_uv.h)
        built_by_uv-0.1.0.data/scripts/whoami.sh (scripts/whoami.sh)
        built_by_uv-0.1.0.data/data/data.csv (assets/data.csv)
        built_by_uv-0.1.0.dist-info/WHEEL (generated)
        built_by_uv-0.1.0.dist-info/entry_points.txt (generated)
        built_by_uv-0.1.0.dist-info/METADATA (generated)
        ");

        let record = wheel_entry(&wheel_path, "built_by_uv-0.1.0.dist-info/RECORD");
        assert_snapshot!(record, @"
        built_by_uv/__init__.py,sha256=AJ7XpTNWxYktP97ydb81UpnNqoebH7K4sHRakAMQKG4,44
        built_by_uv/arithmetic/__init__.py,sha256=x2agwFbJAafc9Z6TdJ0K6b6bLMApQdvRSQjP4iy7IEI,67
        built_by_uv/arithmetic/circle.py,sha256=FYZkv6KwrF9nJcwGOKigjke1dm1Fkie7qW1lWJoh3AE,287
        built_by_uv/arithmetic/pi.txt,sha256=-4HqoLoIrSKGf0JdTrM8BTTiIz8rq-MSCDL6LeF0iuU,8
        built_by_uv/cli.py,sha256=Jcm3PxSb8wTAN3dGm5vKEDQwCgoUXkoeggZeF34QyKM,44
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-APACHE,sha256=QwcOLU5TJoTeUhuIXzhdCEEDDvorGiC6-3YTOl4TecE,11356
        built_by_uv-0.1.0.dist-info/licenses/LICENSE-MIT,sha256=F5Z0Cpu8QWyblXwXhrSo0b9WmYXQxd1LwLjVLJZwbiI,1077
        built_by_uv-0.1.0.dist-info/licenses/third-party-licenses/PEP-401.txt,sha256=KN-KAx829G2saLjVmByc08RFFtIDWvHulqPyD0qEBZI,270
        built_by_uv-0.1.0.data/headers/built_by_uv.h,sha256=p5-HBunJ1dY-xd4dMn03PnRClmGyRosScIp8rT46kg4,144
        built_by_uv-0.1.0.data/scripts/whoami.sh,sha256=T2cmhuDFuX-dTkiSkuAmNyIzvv8AKopjnuTCcr9o-eE,20
        built_by_uv-0.1.0.data/data/data.csv,sha256=7z7u-wXu7Qr2eBZFVpBILlNUiGSngv_1vYqZHVWOU94,265
        built_by_uv-0.1.0.dist-info/WHEEL,sha256=JBpLtoa_WBz5WPGpRsAUTD4Dz6H0KkkdiKWCkfMSS1U,84
        built_by_uv-0.1.0.dist-info/entry_points.txt,sha256=-IO6yaq6x6HSl-zWH96rZmgYvfyHlH00L5WQoCpz-YI,50
        built_by_uv-0.1.0.dist-info/METADATA,sha256=m6EkVvKrGmqx43b_VR45LHD37IZxPYC0NI6Qx9_UXLE,474
        built_by_uv-0.1.0.dist-info/RECORD,,
        ");
    }

    /// Test that `license = { file = "LICENSE" }` is supported.
    #[test]
    fn license_file_pre_pep639() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
            [project]
            name = "pep-pep639-license"
            version = "1.0.0"
            license = { file = "license.txt" }

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
        "#
            },
        )
        .unwrap();
        fs_err::create_dir_all(src.path().join("src").join("pep_pep639_license")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("pep_pep639_license")
                .join("__init__.py"),
        )
        .unwrap();
        fs_err::write(
            src.path().join("license.txt"),
            "Copy carefully.\nSincerely, the authors",
        )
        .unwrap();

        // Build a wheel from a source distribution
        let output_dir = TempDir::new().unwrap();
        build_source_dist(src.path(), output_dir.path(), "0.5.15", false).unwrap();
        let sdist_tree = TempDir::new().unwrap();
        let source_dist_path = output_dir.path().join("pep_pep639_license-1.0.0.tar.gz");
        unpack_sdist(&source_dist_path, sdist_tree.path()).unwrap();
        build_wheel(
            &sdist_tree.path().join("pep_pep639_license-1.0.0"),
            output_dir.path(),
            None,
            "0.5.15",
            false,
        )
        .unwrap();
        let wheel = output_dir
            .path()
            .join("pep_pep639_license-1.0.0-py3-none-any.whl");
        let metadata = wheel_entry(&wheel, "pep_pep639_license-1.0.0.dist-info/METADATA");

        assert_snapshot!(metadata, @"
        Metadata-Version: 2.3
        Name: pep-pep639-license
        Version: 1.0.0
        License: Copy carefully.
                 Sincerely, the authors
        ");
    }

    /// Test that `build_wheel` works after the `prepare_metadata_for_build_wheel` hook.
    #[test]
    fn prepare_metadata_then_build_wheel() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
            [project]
            name = "two-step-build"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
        "#
            },
        )
        .unwrap();
        fs_err::create_dir_all(src.path().join("src").join("two_step_build")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("two_step_build")
                .join("__init__.py"),
        )
        .unwrap();

        // Prepare the metadata.
        let metadata_dir = TempDir::new().unwrap();
        let dist_info_dir = metadata(src.path(), metadata_dir.path(), "0.5.15").unwrap();
        let metadata_prepared =
            fs_err::read_to_string(metadata_dir.path().join(&dist_info_dir).join("METADATA"))
                .unwrap();

        // Build the wheel, using the prepared metadata directory.
        let output_dir = TempDir::new().unwrap();
        build_wheel(
            src.path(),
            output_dir.path(),
            Some(&metadata_dir.path().join(&dist_info_dir)),
            "0.5.15",
            false,
        )
        .unwrap();
        let wheel = output_dir
            .path()
            .join("two_step_build-1.0.0-py3-none-any.whl");
        let metadata_wheel = wheel_entry(&wheel, "two_step_build-1.0.0.dist-info/METADATA");

        assert_eq!(metadata_prepared, metadata_wheel);

        assert_snapshot!(metadata_wheel, @"
        Metadata-Version: 2.3
        Name: two-step-build
        Version: 1.0.0
        ");
    }

    /// Check that non-normalized paths for `module-root` work with the glob inclusions.
    #[test]
    fn test_glob_path_normalization() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
            [project]
            name = "two-step-build"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"

            [tool.uv.build-backend]
            module-root = "./"
            "#
            },
        )
        .unwrap();

        fs_err::create_dir_all(src.path().join("two_step_build")).unwrap();
        File::create(src.path().join("two_step_build").join("__init__.py")).unwrap();

        let dist = TempDir::new().unwrap();
        let build1 = build(src.path(), dist.path()).unwrap();

        assert_snapshot!(build1.source_dist_contents.join("\n"), @"
        two_step_build-1.0.0/
        two_step_build-1.0.0/PKG-INFO
        two_step_build-1.0.0/pyproject.toml
        two_step_build-1.0.0/two_step_build
        two_step_build-1.0.0/two_step_build/__init__.py
        ");

        assert_snapshot!(build1.wheel_contents.join("\n"), @"
        two_step_build-1.0.0.dist-info/
        two_step_build-1.0.0.dist-info/METADATA
        two_step_build-1.0.0.dist-info/RECORD
        two_step_build-1.0.0.dist-info/WHEEL
        two_step_build/
        two_step_build/__init__.py
        ");

        // A path with a parent reference.
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
            [project]
            name = "two-step-build"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"

            [tool.uv.build-backend]
            module-root = "two_step_build/.././"
            "#
            },
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build2 = build(src.path(), dist.path()).unwrap();
        assert_eq!(build1, build2);
    }

    /// Check that upper case letters in module names work.
    #[test]
    fn test_camel_case() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "camelcase"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"

            [tool.uv.build-backend]
            module-name = "camelCase"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();

        fs_err::create_dir_all(src.path().join("src").join("camelCase")).unwrap();
        File::create(src.path().join("src").join("camelCase").join("__init__.py")).unwrap();

        let dist = TempDir::new().unwrap();
        let build1 = build(src.path(), dist.path()).unwrap();

        assert_snapshot!(build1.wheel_contents.join("\n"), @"
        camelCase/
        camelCase/__init__.py
        camelcase-1.0.0.dist-info/
        camelcase-1.0.0.dist-info/METADATA
        camelcase-1.0.0.dist-info/RECORD
        camelcase-1.0.0.dist-info/WHEEL
        ");

        // Check that an explicit wrong casing fails to build.
        fs_err::write(
            src.path().join("pyproject.toml"),
            pyproject_toml.replace("camelCase", "camel_case"),
        )
        .unwrap();
        let build_err = build(src.path(), dist.path()).unwrap_err();
        let err_message = format_err(&build_err)
            .replace(&src.path().user_display().to_string(), "[TEMP_PATH]")
            .replace('\\', "/");
        assert_snapshot!(
            err_message,
            @"Expected a Python module at: [TEMP_PATH]/src/camel_case/__init__.py"
        );
    }

    /// Test that no partial files are left in dist directory when build fails.
    #[test]
    fn no_partial_files_on_build_failure() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();

        // Create a minimal pyproject.toml without __init__.py (will fail)
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
                [project]
                name = "failing-build"
                version = "1.0.0"

                [build-system]
                requires = ["uv_build>=0.5.15,<0.6.0"]
                build-backend = "uv_build"
            "#},
        )
        .unwrap();

        let dist = TempDir::new().unwrap();

        // Source dist build should fail
        let sdist_result = build_source_dist(src.path(), dist.path(), MOCK_UV_VERSION, false);
        assert!(sdist_result.is_err());

        // Wheel build should fail
        let wheel_result = build_wheel(src.path(), dist.path(), None, MOCK_UV_VERSION, false);
        assert!(wheel_result.is_err());

        // dist directory should be empty (no partial files)
        let dist_contents: Vec<_> = fs_err::read_dir(dist.path()).unwrap().collect();
        assert!(
            dist_contents.is_empty(),
            "Expected empty dist directory, but found: {dist_contents:?}"
        );
    }

    /// Test that pre-existing files in the dist directory are deleted before build starts.
    #[test]
    fn existing_files_deleted_on_build_failure() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();

        // Create a minimal pyproject.toml without __init__.py (will fail)
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
                [project]
                name = "failing-build"
                version = "1.0.0"

                [build-system]
                requires = ["uv_build>=0.5.15,<0.6.0"]
                build-backend = "uv_build"
            "#},
        )
        .unwrap();

        let dist = TempDir::new().unwrap();

        // Create pre-existing files in dist directory
        let sdist_path = dist.path().join("failing_build-1.0.0.tar.gz");
        let wheel_path = dist.path().join("failing_build-1.0.0-py3-none-any.whl");
        let old_content = b"old content";
        fs_err::write(&sdist_path, old_content).unwrap();
        fs_err::write(&wheel_path, old_content).unwrap();

        // Build should fail and delete existing files
        let sdist_result = build_source_dist(src.path(), dist.path(), MOCK_UV_VERSION, false);
        assert!(sdist_result.is_err());

        let wheel_result = build_wheel(src.path(), dist.path(), None, MOCK_UV_VERSION, false);
        assert!(wheel_result.is_err());

        // Verify pre-existing files were deleted
        assert!(
            !sdist_path.exists(),
            "Pre-existing sdist should have been deleted"
        );
        assert!(
            !wheel_path.exists(),
            "Pre-existing wheel should have been deleted"
        );
    }

    /// Test that existing files are overwritten on successful build.
    #[test]
    fn existing_files_overwritten_on_success() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();

        // Create a valid project
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
                [project]
                name = "overwrite-test"
                version = "1.0.0"

                [build-system]
                requires = ["uv_build>=0.5.15,<0.6.0"]
                build-backend = "uv_build"
            "#},
        )
        .unwrap();
        fs_err::create_dir_all(src.path().join("src").join("overwrite_test")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("overwrite_test")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();

        // Create pre-existing files in dist directory with known content
        let sdist_path = dist.path().join("overwrite_test-1.0.0.tar.gz");
        let wheel_path = dist.path().join("overwrite_test-1.0.0-py3-none-any.whl");
        let old_content = b"old content";
        fs_err::write(&sdist_path, old_content).unwrap();
        fs_err::write(&wheel_path, old_content).unwrap();

        // Build should succeed and overwrite existing files
        build_source_dist(src.path(), dist.path(), MOCK_UV_VERSION, false).unwrap();
        build_wheel(src.path(), dist.path(), None, MOCK_UV_VERSION, false).unwrap();

        // Verify files were overwritten (content should be different)
        assert_ne!(
            &fs_err::read(&sdist_path).unwrap()[..],
            &old_content[..],
            "Source dist should have been overwritten"
        );
        assert_ne!(
            &fs_err::read(&wheel_path).unwrap()[..],
            &old_content[..],
            "Wheel should have been overwritten"
        );

        // Verify the new files are valid archives
        assert!(
            !sdist_contents(&sdist_path).is_empty(),
            "sdist should be a valid archive"
        );
        assert!(
            !wheel_contents(&wheel_path).is_empty(),
            "wheel should be a valid archive"
        );
    }

    #[test]
    fn invalid_stubs_name() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "camelcase"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"

            [tool.uv.build-backend]
            module-name = "django@home-stubs"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();

        let dist = TempDir::new().unwrap();
        let build_err = build(src.path(), dist.path()).unwrap_err();
        let err_message = format_err(&build_err);
        assert_snapshot!(
            err_message,
            @"
        Invalid module name: django@home-stubs
          Caused by: Invalid character `@` at position 7 for identifier `django@home`, expected an underscore or an alphanumeric character
        "
        );
    }

    /// Stubs packages use a special name and `__init__.pyi`.
    #[test]
    fn stubs_package() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "stuffed-bird-stubs"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("stuffed_bird-stubs")).unwrap();
        // That's the wrong file, we're expecting a `__init__.pyi`.
        let regular_init_py = src
            .path()
            .join("src")
            .join("stuffed_bird-stubs")
            .join("__init__.py");
        File::create(&regular_init_py).unwrap();

        let dist = TempDir::new().unwrap();
        let build_err = build(src.path(), dist.path()).unwrap_err();
        let err_message = format_err(&build_err)
            .replace(&src.path().user_display().to_string(), "[TEMP_PATH]")
            .replace('\\', "/");
        assert_snapshot!(
            err_message,
            @"Expected a Python module at: [TEMP_PATH]/src/stuffed_bird-stubs/__init__.pyi"
        );

        // Create the correct file
        fs_err::remove_file(regular_init_py).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("stuffed_bird-stubs")
                .join("__init__.pyi"),
        )
        .unwrap();

        let build1 = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build1.wheel_contents.join("\n"), @"
        stuffed_bird-stubs/
        stuffed_bird-stubs/__init__.pyi
        stuffed_bird_stubs-1.0.0.dist-info/
        stuffed_bird_stubs-1.0.0.dist-info/METADATA
        stuffed_bird_stubs-1.0.0.dist-info/RECORD
        stuffed_bird_stubs-1.0.0.dist-info/WHEEL
        ");

        // Check that setting the name manually works equally.
        let pyproject_toml = indoc! {r#"
            [project]
            name = "stuffed-bird-stubs"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"

            [tool.uv.build-backend]
            module-name = "stuffed_bird-stubs"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();

        let build2 = build(src.path(), dist.path()).unwrap();
        assert_eq!(build1.wheel_contents, build2.wheel_contents);
    }

    /// A simple namespace package with a single root `__init__.py`.
    #[test]
    fn simple_namespace_package() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "simple-namespace-part"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = "simple_namespace.part"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("simple_namespace").join("part"))
            .unwrap();

        assert_snapshot!(
            build_err(src.path()),
            @"Expected a Python module at: [TEMP_PATH]/src/simple_namespace/part/__init__.py"
        );

        // Create the correct file
        File::create(
            src.path()
                .join("src")
                .join("simple_namespace")
                .join("part")
                .join("__init__.py"),
        )
        .unwrap();

        // For a namespace package, there must not be an `__init__.py` here.
        let bogus_init_py = src
            .path()
            .join("src")
            .join("simple_namespace")
            .join("__init__.py");
        File::create(&bogus_init_py).unwrap();
        assert_snapshot!(
            build_err(src.path()),
            @"For namespace packages, `__init__.py[i]` is not allowed in parent directory: [TEMP_PATH]/src/simple_namespace"
        );
        fs_err::remove_file(bogus_init_py).unwrap();

        let dist = TempDir::new().unwrap();
        let build1 = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build1.source_dist_contents.join("\n"), @"
        simple_namespace_part-1.0.0/
        simple_namespace_part-1.0.0/PKG-INFO
        simple_namespace_part-1.0.0/pyproject.toml
        simple_namespace_part-1.0.0/src
        simple_namespace_part-1.0.0/src/simple_namespace
        simple_namespace_part-1.0.0/src/simple_namespace/part
        simple_namespace_part-1.0.0/src/simple_namespace/part/__init__.py
        ");
        assert_snapshot!(build1.wheel_contents.join("\n"), @"
        simple_namespace/
        simple_namespace/part/
        simple_namespace/part/__init__.py
        simple_namespace_part-1.0.0.dist-info/
        simple_namespace_part-1.0.0.dist-info/METADATA
        simple_namespace_part-1.0.0.dist-info/RECORD
        simple_namespace_part-1.0.0.dist-info/WHEEL
        ");

        // Check that `namespace = true` works too.
        let pyproject_toml = indoc! {r#"
            [project]
            name = "simple-namespace-part"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = "simple_namespace.part"
            namespace = true

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();

        let build2 = build(src.path(), dist.path()).unwrap();
        assert_eq!(build1, build2);
    }

    /// A complex namespace package with a multiple root `__init__.py`.
    #[test]
    fn complex_namespace_package() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "complex-namespace"
            version = "1.0.0"

            [tool.uv.build-backend]
            namespace = true

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(
            src.path()
                .join("src")
                .join("complex_namespace")
                .join("part_a"),
        )
        .unwrap();
        File::create(
            src.path()
                .join("src")
                .join("complex_namespace")
                .join("part_a")
                .join("__init__.py"),
        )
        .unwrap();
        fs_err::create_dir_all(
            src.path()
                .join("src")
                .join("complex_namespace")
                .join("part_b"),
        )
        .unwrap();
        File::create(
            src.path()
                .join("src")
                .join("complex_namespace")
                .join("part_b")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build1 = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build1.wheel_contents.join("\n"), @"
        complex_namespace-1.0.0.dist-info/
        complex_namespace-1.0.0.dist-info/METADATA
        complex_namespace-1.0.0.dist-info/RECORD
        complex_namespace-1.0.0.dist-info/WHEEL
        complex_namespace/
        complex_namespace/part_a/
        complex_namespace/part_a/__init__.py
        complex_namespace/part_b/
        complex_namespace/part_b/__init__.py
        ");

        // Check that setting the name manually works equally.
        let pyproject_toml = indoc! {r#"
            [project]
            name = "complex-namespace"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = "complex_namespace"
            namespace = true

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();

        let build2 = build(src.path(), dist.path()).unwrap();
        assert_eq!(build1, build2);
    }

    /// Stubs for a namespace package.
    #[test]
    fn stubs_namespace() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "cloud.db.schema-stubs"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = "cloud-stubs.db.schema"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(
            src.path()
                .join("src")
                .join("cloud-stubs")
                .join("db")
                .join("schema"),
        )
        .unwrap();
        File::create(
            src.path()
                .join("src")
                .join("cloud-stubs")
                .join("db")
                .join("schema")
                .join("__init__.pyi"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build.wheel_contents.join("\n"), @"
        cloud-stubs/
        cloud-stubs/db/
        cloud-stubs/db/schema/
        cloud-stubs/db/schema/__init__.pyi
        cloud_db_schema_stubs-1.0.0.dist-info/
        cloud_db_schema_stubs-1.0.0.dist-info/METADATA
        cloud_db_schema_stubs-1.0.0.dist-info/RECORD
        cloud_db_schema_stubs-1.0.0.dist-info/WHEEL
        ");
    }

    /// A package with multiple modules, one a regular module and two namespace modules.
    #[test]
    fn multiple_module_names() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "simple-namespace-part"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = ["foo", "simple_namespace.part_a", "simple_namespace.part_b"]

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("foo")).unwrap();
        fs_err::create_dir_all(
            src.path()
                .join("src")
                .join("simple_namespace")
                .join("part_a"),
        )
        .unwrap();
        fs_err::create_dir_all(
            src.path()
                .join("src")
                .join("simple_namespace")
                .join("part_b"),
        )
        .unwrap();

        // Most of these checks exist in other tests too, but we want to ensure that they apply
        // with multiple modules too.

        // The first module is missing an `__init__.py`.
        assert_snapshot!(
            build_err(src.path()),
            @"Expected a Python module at: [TEMP_PATH]/src/foo/__init__.py"
        );

        // Create the first correct `__init__.py` file
        File::create(src.path().join("src").join("foo").join("__init__.py")).unwrap();

        // The second module, a namespace, is missing an `__init__.py`.
        assert_snapshot!(
            build_err(src.path()),
            @"Expected a Python module at: [TEMP_PATH]/src/simple_namespace/part_a/__init__.py"
        );

        // Create the other two correct `__init__.py` files
        File::create(
            src.path()
                .join("src")
                .join("simple_namespace")
                .join("part_a")
                .join("__init__.py"),
        )
        .unwrap();
        File::create(
            src.path()
                .join("src")
                .join("simple_namespace")
                .join("part_b")
                .join("__init__.py"),
        )
        .unwrap();

        // For the second module, a namespace, there must not be an `__init__.py` here.
        let bogus_init_py = src
            .path()
            .join("src")
            .join("simple_namespace")
            .join("__init__.py");
        File::create(&bogus_init_py).unwrap();
        assert_snapshot!(
            build_err(src.path()),
            @"For namespace packages, `__init__.py[i]` is not allowed in parent directory: [TEMP_PATH]/src/simple_namespace"
        );
        fs_err::remove_file(bogus_init_py).unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build.source_dist_contents.join("\n"), @"
        simple_namespace_part-1.0.0/
        simple_namespace_part-1.0.0/PKG-INFO
        simple_namespace_part-1.0.0/pyproject.toml
        simple_namespace_part-1.0.0/src
        simple_namespace_part-1.0.0/src/foo
        simple_namespace_part-1.0.0/src/foo/__init__.py
        simple_namespace_part-1.0.0/src/simple_namespace
        simple_namespace_part-1.0.0/src/simple_namespace/part_a
        simple_namespace_part-1.0.0/src/simple_namespace/part_a/__init__.py
        simple_namespace_part-1.0.0/src/simple_namespace/part_b
        simple_namespace_part-1.0.0/src/simple_namespace/part_b/__init__.py
        ");
        assert_snapshot!(build.wheel_contents.join("\n"), @"
        foo/
        foo/__init__.py
        simple_namespace/
        simple_namespace/part_a/
        simple_namespace/part_a/__init__.py
        simple_namespace/part_b/
        simple_namespace/part_b/__init__.py
        simple_namespace_part-1.0.0.dist-info/
        simple_namespace_part-1.0.0.dist-info/METADATA
        simple_namespace_part-1.0.0.dist-info/RECORD
        simple_namespace_part-1.0.0.dist-info/WHEEL
        ");
    }

    /// `prune_redundant_modules` should remove modules which are already
    /// included (either directly or via their parent)
    #[test]
    fn test_prune_redundant_modules() {
        fn check(input: &[&str], expect: &[&str]) {
            let input = input.iter().map(|s| (*s).to_string()).collect();
            let expect: Vec<_> = expect.iter().map(|s| (*s).to_string()).collect();
            assert_eq!(prune_redundant_modules(input), expect);
        }

        // Basic cases
        check(&[], &[]);
        check(&["foo"], &["foo"]);
        check(&["foo", "bar"], &["bar", "foo"]);

        // Deshadowing
        check(&["foo", "foo.bar"], &["foo"]);
        check(&["foo.bar", "foo"], &["foo"]);
        check(
            &["foo.bar.a", "foo.bar.b", "foo.bar", "foo", "foo.bar.a.c"],
            &["foo"],
        );
        check(
            &["bar.one", "bar.two", "baz", "bar", "baz.one"],
            &["bar", "baz"],
        );

        // Potential false positives
        check(&["foo", "foobar"], &["foo", "foobar"]);
        check(
            &["foo", "foobar", "foo.bar", "foobar.baz"],
            &["foo", "foobar"],
        );
        check(&["foo.bar", "foo.baz"], &["foo.bar", "foo.baz"]);
        check(&["foo", "foo", "foo.bar", "foo.bar"], &["foo"]);

        // Everything
        check(
            &[
                "foo.inner",
                "foo.inner.deeper",
                "foo",
                "bar",
                "bar.sub",
                "bar.sub.deep",
                "foobar",
                "baz.baz.bar",
                "baz.baz",
                "qux",
            ],
            &["bar", "baz.baz", "foo", "foobar", "qux"],
        );
    }

    /// A package with duplicate module names.
    #[test]
    fn duplicate_module_names() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();
        let pyproject_toml = indoc! {r#"
            [project]
            name = "duplicate"
            version = "1.0.0"

            [tool.uv.build-backend]
            module-name = ["foo", "foo", "bar.baz", "bar.baz.submodule"]

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
            "#
        };
        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("foo")).unwrap();
        File::create(src.path().join("src").join("foo").join("__init__.py")).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("bar").join("baz")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("bar")
                .join("baz")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();
        assert_snapshot!(build.source_dist_contents.join("\n"), @"
        duplicate-1.0.0/
        duplicate-1.0.0/PKG-INFO
        duplicate-1.0.0/pyproject.toml
        duplicate-1.0.0/src
        duplicate-1.0.0/src/bar
        duplicate-1.0.0/src/bar/baz
        duplicate-1.0.0/src/bar/baz/__init__.py
        duplicate-1.0.0/src/foo
        duplicate-1.0.0/src/foo/__init__.py
        ");
        assert_snapshot!(build.wheel_contents.join("\n"), @"
        bar/
        bar/baz/
        bar/baz/__init__.py
        duplicate-1.0.0.dist-info/
        duplicate-1.0.0.dist-info/METADATA
        duplicate-1.0.0.dist-info/RECORD
        duplicate-1.0.0.dist-info/WHEEL
        foo/
        foo/__init__.py
        ");
    }

    /// Check that JSON metadata files are present.
    #[test]
    fn metadata_json_preview() {
        let _preview = uv_preview::test::with_features(&[PreviewFeature::MetadataJson]);
        let src = TempDir::new().unwrap();
        fs_err::write(
            src.path().join("pyproject.toml"),
            indoc! {r#"
            [project]
            name = "metadata-json-preview"
            version = "1.0.0"

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
        "#
            },
        )
        .unwrap();
        fs_err::create_dir_all(src.path().join("src").join("metadata_json_preview")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("metadata_json_preview")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();

        assert_snapshot!(build.wheel_contents.join("\n"), @"
        metadata_json_preview-1.0.0.dist-info/
        metadata_json_preview-1.0.0.dist-info/METADATA
        metadata_json_preview-1.0.0.dist-info/METADATA.json
        metadata_json_preview-1.0.0.dist-info/RECORD
        metadata_json_preview-1.0.0.dist-info/WHEEL
        metadata_json_preview-1.0.0.dist-info/WHEEL.json
        metadata_json_preview/
        metadata_json_preview/__init__.py
        ");
    }

    /// Test that nested `pyproject.toml` files in subdirectories are preserved in the sdist and
    /// not accidentally skipped by the root-level TOML rewriting logic.
    #[test]
    fn nested_pyproject_toml_preserved() {
        let _preview =
            uv_preview::test::with_features(&[PreviewFeature::TomlBackwardsCompatibility]);
        let tmp_dir = TempDir::new().unwrap();

        fs_err::write(
            tmp_dir.path().join("pyproject.toml"),
            indoc! {r#"
                [project]
                name = "nested-pyproject"
                version = "1.0.0"

                [build-system]
                requires = ["uv_build>=0.5.15,<0.6.0"]
                build-backend = "uv_build"

                [tool.uv.build-backend]
                source-include = ["subproject/**"]
            "#},
        )
        .unwrap();

        let nested_pyproject = tmp_dir.path().join("src").join("nested_pyproject");
        fs_err::create_dir_all(&nested_pyproject).unwrap();
        File::create(nested_pyproject.join("__init__.py")).unwrap();

        // Create a nested pyproject.toml in a subdirectory
        fs_err::write(
            nested_pyproject.join("pyproject.toml"),
            indoc! {r#"
                [project]
                name = "subproject"
                version = "0.1.0"
            "#},
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let source_dist_filename =
            build_source_dist(tmp_dir.path(), dist.path(), MOCK_UV_VERSION, false).unwrap();
        let source_dist_path = dist.path().join(source_dist_filename.to_string());
        let contents = sdist_contents(&source_dist_path);

        // The nested `pyproject.toml` should be present, and not being rewritten
        // with a `pyproject.toml.orig`.
        assert!(
            contents
                .iter()
                .any(|f| f.contains("nested_pyproject/pyproject.toml")),
        );
        assert!(
            !contents
                .iter()
                .any(|f| f.contains("nested_pyproject/pyproject.toml.orig")),
        );
    }

    /// Test that TOML 1.1 features in pyproject.toml are rewritten to TOML 1.0 for backward
    /// compatibility with older tools. The original file is preserved as pyproject.toml.orig.
    #[test]
    fn toml_1_1_backward_compatibility() {
        let _preview =
            uv_preview::test::with_features(&[PreviewFeature::TomlBackwardsCompatibility]);
        let src = TempDir::new().unwrap();

        // A `pyproject.toml` with a TOML 1.1 feature, trailing commas in inline tables.
        let pyproject_toml = indoc! {r#"
            [project]
            name = "toml11-project"
            version = "0.1.0"
            description = "A test package using TOML 1.1 features"
            requires-python = ">=3.12"
            # TOML 1.1 feature: Trailing comma in inline table
            authors = [
                { name = "Ferris", email = "ferris@example.com", },
                { name = "Platypus", email = "platypus@example.com", },
            ]

            [tool.foo]
            when = 1969-06-20T20:17Z

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
        "#};

        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("toml11_project")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("toml11_project")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();

        // Check that both `pyproject.toml` and `pyproject.toml.orig` are in the sdist.
        assert_snapshot!(build.source_dist_contents.join("\n"), @"
        toml11_project-0.1.0/
        toml11_project-0.1.0/PKG-INFO
        toml11_project-0.1.0/pyproject.toml
        toml11_project-0.1.0/pyproject.toml.orig
        toml11_project-0.1.0/src
        toml11_project-0.1.0/src/toml11_project
        toml11_project-0.1.0/src/toml11_project/__init__.py
        ");

        // Extract the sdist to verify the contents of both files.
        let source_dist_path = dist.path().join(build.source_dist_filename.to_string());
        let sdist_tree = TempDir::new().unwrap();
        unpack_sdist(&source_dist_path, sdist_tree.path()).unwrap();
        let sdist_top_level_directory = sdist_tree.path().join(format!(
            "{}-{}",
            build.source_dist_filename.name.as_dist_info_name(),
            build.source_dist_filename.version
        ));
        let pyproject_toml_content =
            fs_err::read_to_string(sdist_top_level_directory.join("pyproject.toml")).unwrap();
        let pyproject_toml_orig_content =
            fs_err::read_to_string(sdist_top_level_directory.join("pyproject.toml.orig")).unwrap();

        assert_eq!(pyproject_toml_orig_content, pyproject_toml);
        assert_snapshot!(pyproject_toml_content, @r#"
        [project]
        name = "toml11-project"
        version = "0.1.0"
        description = "A test package using TOML 1.1 features"
        requires-python = ">=3.12"

        [[project.authors]]
        name = "Ferris"
        email = "ferris@example.com"

        [[project.authors]]
        name = "Platypus"
        email = "platypus@example.com"

        [tool.foo]
        when = 1969-06-20T20:17:00Z

        [build-system]
        requires = ["uv_build>=0.5.15,<0.6.0"]
        build-backend = "uv_build"
        "#);
    }

    /// Test that TOML 1.1 features in pyproject.toml trigger auto-detection and rewrite to TOML
    /// 1.0, even without explicitly enabling `PreviewFeature::TomlBackwardsCompatibility`.
    #[test]
    fn toml_1_1_backward_compatibility_auto_detection() {
        let _preview = uv_preview::test::with_features(&[]);
        let src = TempDir::new().unwrap();

        // A `pyproject.toml` with a TOML 1.1 feature, trailing commas in inline tables.
        let pyproject_toml = indoc! {r#"
            [project]
            name = "toml11-project"
            version = "0.1.0"
            description = "A test package using TOML 1.1 features"
            requires-python = ">=3.12"
            # TOML 1.1 feature: Trailing comma in inline table
            authors = [
                { name = "Ferris", email = "ferris@example.com", },
                { name = "Platypus", email = "platypus@example.com", },
            ]

            [tool.foo]
            when = 1969-06-20T20:17Z

            [build-system]
            requires = ["uv_build>=0.5.15,<0.6.0"]
            build-backend = "uv_build"
        "#};

        fs_err::write(src.path().join("pyproject.toml"), pyproject_toml).unwrap();
        fs_err::create_dir_all(src.path().join("src").join("toml11_project")).unwrap();
        File::create(
            src.path()
                .join("src")
                .join("toml11_project")
                .join("__init__.py"),
        )
        .unwrap();

        let dist = TempDir::new().unwrap();
        let build = build(src.path(), dist.path()).unwrap();

        // Check that both `pyproject.toml` and `pyproject.toml.orig` are in the sdist.
        assert_snapshot!(build.source_dist_contents.join("\n"), @"
        toml11_project-0.1.0/
        toml11_project-0.1.0/PKG-INFO
        toml11_project-0.1.0/pyproject.toml
        toml11_project-0.1.0/pyproject.toml.orig
        toml11_project-0.1.0/src
        toml11_project-0.1.0/src/toml11_project
        toml11_project-0.1.0/src/toml11_project/__init__.py
        ");

        // Extract the sdist to verify the contents of both files.
        let source_dist_path = dist.path().join(build.source_dist_filename.to_string());
        let sdist_tree = TempDir::new().unwrap();
        unpack_sdist(&source_dist_path, sdist_tree.path()).unwrap();
        let sdist_top_level_directory = sdist_tree.path().join(format!(
            "{}-{}",
            build.source_dist_filename.name.as_dist_info_name(),
            build.source_dist_filename.version
        ));
        let pyproject_toml_content =
            fs_err::read_to_string(sdist_top_level_directory.join("pyproject.toml")).unwrap();
        let pyproject_toml_orig_content =
            fs_err::read_to_string(sdist_top_level_directory.join("pyproject.toml.orig")).unwrap();

        assert_eq!(pyproject_toml_orig_content, pyproject_toml);
        assert_snapshot!(pyproject_toml_content, @r#"
        [project]
        name = "toml11-project"
        version = "0.1.0"
        description = "A test package using TOML 1.1 features"
        requires-python = ">=3.12"

        [[project.authors]]
        name = "Ferris"
        email = "ferris@example.com"

        [[project.authors]]
        name = "Platypus"
        email = "platypus@example.com"

        [tool.foo]
        when = 1969-06-20T20:17:00Z

        [build-system]
        requires = ["uv_build>=0.5.15,<0.6.0"]
        build-backend = "uv_build"
        "#);
    }
}
