use super::{resolve_repo, run_git, run_git_task};
use serde::Serialize;
use std::path::{Component, Path, PathBuf};

#[derive(Debug, Serialize)]
pub struct GitSubmodule {
    pub name: String,
    pub path: String,
    pub owner_path: String,
    pub relative_path: String,
    pub full_path: String,
    pub url: String,
    pub branch: Option<String>,
    pub recorded_commit: String,
    pub local_commit: Option<String>,
    pub dirty: bool,
    pub conflicted: bool,
    pub depth: usize,
}

fn safe_path(repo: &Path, path: &str) -> Result<PathBuf, String> {
    if path.is_empty()
        || path.starts_with('-')
        || !Path::new(path)
            .components()
            .all(|c| matches!(c, Component::Normal(_)))
    {
        return Err("Submodule path must be a relative path inside the repository.".into());
    }
    let root = repo.canonicalize().map_err(|e| e.to_string())?;
    let target = root.join(path);
    let mut parent = target.as_path();
    while !parent.exists() {
        parent = parent.parent().ok_or("Invalid submodule path")?;
    }
    if !parent
        .canonicalize()
        .map_err(|e| e.to_string())?
        .starts_with(&root)
    {
        return Err("Submodule path points outside the repository.".into());
    }
    Ok(target)
}

fn config(repo: &Path, key: &str) -> Option<String> {
    run_git(repo, ["config", "--file", ".gitmodules", "--get", key])
        .ok()
        .map(|b| String::from_utf8_lossy(&b).trim().to_owned())
}

fn collect(
    repo: &Path,
    prefix: &str,
    depth: usize,
    recursive: bool,
    result: &mut Vec<GitSubmodule>,
) -> Result<(), String> {
    if depth > 32 {
        return Err("Submodules exceed the maximum nesting depth (32).".into());
    }
    let index = run_git(repo, ["ls-files", "--stage", "-z"])?;
    let mut links = std::collections::BTreeMap::new();
    for entry in index.split(|b| *b == 0).filter(|e| !e.is_empty()) {
        let Some(tab) = entry.iter().position(|b| *b == b'\t') else {
            continue;
        };
        let metadata = String::from_utf8_lossy(&entry[..tab]);
        let fields: Vec<_> = metadata.split_whitespace().collect();
        if fields.len() != 3 || fields[0] != "160000" {
            continue;
        }
        let path = String::from_utf8(entry[tab + 1..].to_vec())
            .map_err(|_| "Submodule path is not UTF-8")?;
        links.insert(path, (fields[1].to_owned(), fields[2] != "0"));
    }
    let paths = if repo.join(".gitmodules").exists() {
        let output = super::git_command()
            .arg("-C")
            .arg(repo)
            .args([
                "config",
                "-z",
                "--file",
                ".gitmodules",
                "--get-regexp",
                "^submodule\\..*\\.path$",
            ])
            .output()
            .map_err(|e| e.to_string())?;
        if !output.status.success() && output.status.code() != Some(1) {
            return Err(super::command_output_details(&output));
        }
        output.stdout
    } else {
        Vec::new()
    };
    let names: std::collections::BTreeMap<_, _> = paths
        .split(|b| *b == 0)
        .filter_map(|entry| {
            let text = String::from_utf8_lossy(entry);
            let (key, value) = text.split_once('\n')?;
            Some((
                value.to_owned(),
                key.strip_prefix("submodule.")?
                    .strip_suffix(".path")?
                    .to_owned(),
            ))
        })
        .collect();
    for (relative_path, (recorded_commit, conflicted)) in links {
        let full = safe_path(repo, &relative_path)?;
        let name = names
            .get(&relative_path)
            .cloned()
            .unwrap_or_else(|| relative_path.clone());
        // A directory without its own .git would otherwise resolve to the parent's HEAD.
        let initialized = full.join(".git").exists();
        let local_commit = if initialized {
            Some(
                String::from_utf8_lossy(&run_git(&full, ["rev-parse", "HEAD"])?)
                    .trim()
                    .to_owned(),
            )
        } else {
            None
        };
        let dirty = initialized
            && !run_git(
                &full,
                [
                    "status",
                    "--porcelain=v1",
                    "--untracked-files=normal",
                    "--ignore-submodules=none",
                ],
            )?
            .is_empty();
        let path = format!("{prefix}{relative_path}");
        result.push(GitSubmodule {
            name,
            path: path.clone(),
            owner_path: repo.to_string_lossy().into_owned(),
            relative_path: relative_path.clone(),
            full_path: full.to_string_lossy().into_owned(),
            url: config(
                repo,
                &format!(
                    "submodule.{}.url",
                    names.get(&relative_path).unwrap_or(&relative_path)
                ),
            )
            .unwrap_or_default(),
            branch: if initialized {
                run_git(&full, ["symbolic-ref", "--quiet", "--short", "HEAD"])
                    .ok()
                    .map(|b| String::from_utf8_lossy(&b).trim().to_owned())
            } else {
                None
            },
            recorded_commit,
            local_commit,
            dirty,
            conflicted,
            depth,
        });
        if recursive && initialized {
            collect(&full, &format!("{path}/"), depth + 1, true, result)?;
        }
    }
    Ok(())
}

fn list(repo: &Path, recursive: bool) -> Result<Vec<GitSubmodule>, String> {
    let mut result = Vec::new();
    collect(repo, "", 0, recursive, &mut result)?;
    Ok(result)
}

#[tauri::command]
pub async fn list_submodules(path: String, recursive: bool) -> Result<Vec<GitSubmodule>, String> {
    run_git_task("Could not load submodules", move || {
        list(&resolve_repo(&path)?, recursive)
    })
    .await
}

#[cfg(test)]
fn operate(repo: &Path, module_path: &str, action: &str, recursive: bool) -> Result<(), String> {
    operate_authenticated(repo, module_path, action, recursive, None, None)
}

fn operate_authenticated(
    repo: &Path,
    module_path: &str,
    action: &str,
    recursive: bool,
    username: Option<&str>,
    password: Option<&str>,
) -> Result<(), String> {
    let module = list(repo, true)?
        .into_iter()
        .find(|m| m.path == module_path)
        .ok_or("Submodule no longer exists. Refresh the list.")?;
    if module.conflicted {
        return Err("Resolve the submodule conflict before continuing.".into());
    }
    let owner = Path::new(&module.owner_path);
    match action {
        "update" | "initialize" => {
            // A delayed prompt must never reset an already initialized module.
            if action == "initialize" && module.local_commit.is_some() {
                return Ok(());
            }
            if module.dirty {
                return Err("Commit or stash local submodule changes before checking out the recorded commit.".into());
            }
            let mut args = vec![
                "--literal-pathspecs",
                "submodule",
                "update",
                "--init",
                "--checkout",
            ];
            if recursive {
                args.push("--recursive");
            }
            args.extend(["--", module.relative_path.as_str()]);
            submodule_git(owner, &args, username, password)?;
        }
        "fetch" => {
            if module.local_commit.is_none() {
                return Err("Initialize the submodule first.".into());
            }
            submodule_git(
                Path::new(&module.full_path),
                &["fetch", "--tags"],
                username,
                password,
            )?;
        }
        "stage" => {
            if module.local_commit.is_none() {
                return Err("Initialize the submodule first.".into());
            }
            run_git(
                owner,
                ["--literal-pathspecs", "add", "--", &module.relative_path],
            )?;
        }
        "sync" => {
            let mut args = vec!["--literal-pathspecs", "submodule", "sync"];
            if recursive {
                args.push("--recursive");
            }
            args.extend(["--", module.relative_path.as_str()]);
            submodule_git(owner, &args, username, password)?;
        }
        _ => return Err("Unknown submodule action.".into()),
    }
    Ok(())
}

#[tauri::command]
pub async fn submodule_action(
    path: String,
    module_path: String,
    action: String,
    recursive: bool,
    username: Option<String>,
    password: Option<String>,
) -> Result<(), String> {
    run_git_task("Could not update submodule", move || {
        operate_authenticated(
            &resolve_repo(&path)?,
            &module_path,
            &action,
            recursive,
            username.as_deref(),
            password.as_deref(),
        )
    })
    .await
}

fn checkout_revision(
    repo: &Path,
    module_path: &str,
    revision: &str,
    kind: &str,
) -> Result<(), String> {
    let module = list(repo, true)?
        .into_iter()
        .find(|m| m.path == module_path)
        .ok_or("Submodule no longer exists. Refresh the list.")?;
    if module.local_commit.is_none() {
        return Err("Initialize the submodule first.".into());
    }
    if module.dirty || module.conflicted {
        return Err("Commit or stash local changes and resolve conflicts before changing the submodule revision.".into());
    }
    let target = Path::new(&module.full_path);
    let revision = revision.trim();
    let reference = match kind {
        "commit"
            if (4..=64).contains(&revision.len())
                && revision.bytes().all(|c| c.is_ascii_hexdigit()) =>
        {
            revision.to_owned()
        }
        "tag" => {
            let reference = format!("refs/tags/{revision}");
            run_git(target, ["check-ref-format", &reference])?;
            reference
        }
        _ => return Err("Choose a tag or enter a valid commit hash.".into()),
    };
    let hash = run_git(
        target,
        [
            "rev-parse",
            "--verify",
            "--end-of-options",
            &format!("{reference}^{{commit}}"),
        ],
    )
    .map_err(|_| "Commit or tag was not found locally. Fetch tags and commits first.".to_owned())?;
    let hash = String::from_utf8_lossy(&hash);
    run_git(
        target,
        [
            "checkout",
            "--detach",
            "--no-recurse-submodules",
            hash.trim(),
        ],
    )?;
    Ok(())
}

#[tauri::command]
pub async fn checkout_submodule_revision(
    path: String,
    module_path: String,
    revision: String,
    kind: String,
) -> Result<(), String> {
    run_git_task("Could not change submodule revision", move || {
        checkout_revision(&resolve_repo(&path)?, &module_path, &revision, &kind)
    })
    .await
}

#[cfg(test)]
fn add(repo: &Path, url: &str, destination: &str, branch: Option<&str>) -> Result<(), String> {
    add_authenticated(repo, url, destination, branch, None, None)
}

fn add_authenticated(
    repo: &Path,
    url: &str,
    destination: &str,
    branch: Option<&str>,
    username: Option<&str>,
    password: Option<&str>,
) -> Result<(), String> {
    safe_path(repo, destination)?;
    if url.trim().is_empty() || url.starts_with('-') {
        return Err("Enter a valid repository URL.".into());
    }
    let mut args = vec!["submodule", "add"];
    if let Some(branch) = branch.filter(|b| !b.is_empty()) {
        run_git(repo, ["check-ref-format", "--branch", branch])?;
        args.extend(["--branch", branch]);
    }
    args.extend(["--", url, destination]);
    submodule_git(repo, &args, username, password)?;
    Ok(())
}

fn submodule_git(
    repo: &Path,
    args: &[&str],
    username: Option<&str>,
    password: Option<&str>,
) -> Result<(), String> {
    if let (Some(username), Some(password)) = (username, password) {
        return super::run_git_authenticated(repo, args, username, password).map(|_| ());
    }
    let output = super::git_command()
        .arg("-C")
        .arg(repo)
        .args(args)
        .env("GIT_TERMINAL_PROMPT", "0")
        .output()
        .map_err(|e| e.to_string())?;
    if output.status.success() {
        Ok(())
    } else {
        let details = super::command_output_details(&output);
        if super::is_auth_error(&details) {
            Err(format!("AUTH_FAILED:{details}"))
        } else {
            Err(details)
        }
    }
}

#[tauri::command]
pub async fn add_submodule(
    path: String,
    url: String,
    destination: String,
    branch: Option<String>,
    username: Option<String>,
    password: Option<String>,
) -> Result<(), String> {
    run_git_task("Could not add submodule", move || {
        add_authenticated(
            &resolve_repo(&path)?,
            &url,
            &destination,
            branch.as_deref(),
            username.as_deref(),
            password.as_deref(),
        )
    })
    .await
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::{
        fs,
        sync::atomic::{AtomicU64, Ordering},
    };
    static NEXT: AtomicU64 = AtomicU64::new(0);
    struct Fixture(PathBuf);
    impl Drop for Fixture {
        fn drop(&mut self) {
            let _ = fs::remove_dir_all(&self.0);
        }
    }
    fn git(repo: &Path, args: &[&str]) {
        run_git(repo, args).unwrap();
    }
    fn fixture() -> Fixture {
        let path = std::env::temp_dir().join(format!(
            "gitlite-submodules-{}-{}",
            std::process::id(),
            NEXT.fetch_add(1, Ordering::Relaxed)
        ));
        fs::create_dir_all(&path).unwrap();
        for name in ["parent", "child"] {
            let repo = path.join(name);
            fs::create_dir(&repo).unwrap();
            git(&repo, &["init", "-q"]);
            git(&repo, &["config", "user.name", "Test"]);
            git(&repo, &["config", "user.email", "test@example.com"]);
            fs::write(repo.join("file.txt"), "first\n").unwrap();
            git(&repo, &["add", "."]);
            git(&repo, &["commit", "-qm", "initial"]);
        }
        let parent = path.join("parent");
        let child = path.join("child");
        git(
            &parent,
            &[
                "-c",
                "protocol.file.allow=always",
                "submodule",
                "add",
                "--",
                child.to_str().unwrap(),
                "libs/with spaces",
            ],
        );
        git(&parent, &["commit", "-qam", "submodule"]);
        Fixture(path)
    }
    #[test]
    #[cfg(unix)]
    fn submodules_authenticated_commands_receive_askpass_credentials() {
        let f = fixture();
        let repo = f.0.join("parent");
        let probe = r#"alias.auth-probe=!test "$("$GIT_ASKPASS" Username)" = 'fixture-user' && test "$("$GIT_ASKPASS" Password)" = 'fixture-token'"#;
        submodule_git(
            &repo,
            &["-c", probe, "auth-probe"],
            Some("fixture-user"),
            Some("fixture-token"),
        )
        .unwrap();
    }

    #[test]
    #[cfg(unix)]
    fn submodules_auth_failures_are_classified_for_the_login_dialog() {
        let f = fixture();
        let repo = f.0.join("parent");
        let probe = "alias.auth-probe=!echo 'fatal: could not read Username: terminal prompts disabled' >&2; exit 1";
        let error = submodule_git(&repo, &["-c", probe, "auth-probe"], None, None).unwrap_err();
        assert!(error.starts_with("AUTH_FAILED:"));
        let error = submodule_git(
            &repo,
            &["-c", probe, "auth-probe"],
            Some("user"),
            Some("token"),
        )
        .unwrap_err();
        assert!(error.starts_with("AUTH_FAILED:"));
        let error = submodule_git(&repo, &["not-a-command"], None, None).unwrap_err();
        assert!(!error.starts_with("AUTH_FAILED:"));
    }

    #[test]
    fn submodules_checkout_tags_and_commits_without_staging_parent() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        let original = list(&repo, true).unwrap()[0].recorded_commit.clone();
        git(&child, &["tag", "v1.0"]);
        fs::write(child.join("file.txt"), "version two\n").unwrap();
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "version two",
            ],
        );
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "tag",
                "-a",
                "v2.0",
                "-m",
                "version two",
            ],
        );
        let latest = list(&repo, true).unwrap()[0].local_commit.clone().unwrap();
        checkout_revision(&repo, "libs/with spaces", "v1.0", "tag").unwrap();
        assert_eq!(
            list(&repo, true).unwrap()[0].local_commit.as_deref(),
            Some(original.as_str())
        );
        checkout_revision(&repo, "libs/with spaces", "v2.0", "tag").unwrap();
        let module = list(&repo, true).unwrap().remove(0);
        assert_eq!(module.local_commit.as_deref(), Some(latest.as_str()));
        assert_eq!(module.recorded_commit, original);
        assert!(module.branch.is_none());
        checkout_revision(&repo, "libs/with spaces", &original[..8], "commit").unwrap();
        assert_eq!(
            list(&repo, true).unwrap()[0].local_commit.as_deref(),
            Some(original.as_str())
        );
    }

    #[test]
    fn submodules_revision_rejects_unknown_refs_options_and_local_changes() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        let before = list(&repo, true).unwrap()[0].local_commit.clone();
        for (revision, kind) in [
            ("--force", "commit"),
            ("HEAD~1", "commit"),
            ("../bad", "tag"),
            ("missing", "tag"),
            ("deadbeef", "commit"),
            ("main", "branch"),
        ] {
            assert!(checkout_revision(&repo, "libs/with spaces", revision, kind).is_err());
        }
        assert_eq!(list(&repo, true).unwrap()[0].local_commit, before);
        git(&child, &["tag", "valid"]);
        fs::write(child.join("file.txt"), "local changes\n").unwrap();
        assert!(
            checkout_revision(&repo, "libs/with spaces", "valid", "tag")
                .unwrap_err()
                .contains("stash")
        );
        assert_eq!(
            fs::read_to_string(child.join("file.txt")).unwrap(),
            "local changes\n"
        );
    }

    #[test]
    fn submodules_list_clean_and_uninitialized() {
        let f = fixture();
        let repo = f.0.join("parent");
        let modules = list(&repo, true).unwrap();
        assert_eq!(modules.len(), 1);
        assert_eq!(modules[0].path, "libs/with spaces");
        assert_eq!(
            modules[0].local_commit.as_deref(),
            Some(modules[0].recorded_commit.as_str())
        );
        assert!(!modules[0].dirty);
        git(&repo, &["submodule", "deinit", "--", "libs/with spaces"]);
        assert!(list(&repo, true).unwrap()[0].local_commit.is_none());
        operate(&repo, "libs/with spaces", "initialize", true).unwrap();
        assert!(list(&repo, true).unwrap()[0].local_commit.is_some());
    }
    #[test]
    fn submodules_dirty_checkout_is_rejected_and_reference_can_be_staged() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        fs::write(child.join("file.txt"), "changed\n").unwrap();
        assert!(list(&repo, true).unwrap()[0].dirty);
        assert!(
            operate(&repo, "libs/with spaces", "update", true)
                .unwrap_err()
                .contains("stash")
        );
        assert_eq!(
            fs::read_to_string(child.join("file.txt")).unwrap(),
            "changed\n"
        );
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "new commit",
            ],
        );
        let before = list(&repo, false).unwrap();
        assert_ne!(
            before[0].local_commit.as_deref(),
            Some(before[0].recorded_commit.as_str())
        );
        operate(&repo, "libs/with spaces", "stage", false).unwrap();
        let after = list(&repo, false).unwrap();
        assert_eq!(
            after[0].local_commit.as_deref(),
            Some(after[0].recorded_commit.as_str())
        );
    }
    #[test]
    fn submodules_detect_new_uninitialized_module_after_pull() {
        let f = fixture();
        let upstream = f.0.join("parent");
        let clone = f.0.join("clone");
        git(
            &f.0,
            &[
                "-c",
                "protocol.file.allow=always",
                "clone",
                "--recurse-submodules",
                upstream.to_str().unwrap(),
                clone.to_str().unwrap(),
            ],
        );
        assert!(
            list(&clone, true)
                .unwrap()
                .iter()
                .all(|module| module.local_commit.is_some())
        );
        git(
            &upstream,
            &[
                "-c",
                "protocol.file.allow=always",
                "submodule",
                "add",
                "--",
                f.0.join("child").to_str().unwrap(),
                "libs/new-module",
            ],
        );
        git(&upstream, &["commit", "-am", "Add new module"]);
        git(&clone, &["pull", "--ff-only"]);
        let modules = list(&clone, true).unwrap();
        let missing: Vec<_> = modules
            .iter()
            .filter(|module| module.local_commit.is_none())
            .collect();
        assert_eq!(missing.len(), 1);
        assert_eq!(missing[0].path, "libs/new-module");
    }

    #[test]
    fn submodules_initialize_does_not_reset_existing_commits_or_changes() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        fs::write(child.join("file.txt"), "new commit\n").unwrap();
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "new commit",
            ],
        );
        fs::write(child.join("file.txt"), "local edits\n").unwrap();
        let before = list(&repo, true).unwrap()[0].local_commit.clone();
        operate(&repo, "libs/with spaces", "initialize", true).unwrap();
        assert_eq!(list(&repo, true).unwrap()[0].local_commit, before);
        assert_eq!(
            fs::read_to_string(child.join("file.txt")).unwrap(),
            "local edits\n"
        );
    }

    #[test]
    fn submodules_checkout_restores_recorded_commit() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        fs::write(child.join("file.txt"), "changed\n").unwrap();
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "new commit",
            ],
        );
        operate(&repo, "libs/with spaces", "update", false).unwrap();
        assert_eq!(
            fs::read_to_string(child.join("file.txt")).unwrap(),
            "first\n"
        );
    }
    #[test]
    fn submodules_nested_discovery_and_stage_use_parent_repository() {
        let f = fixture();
        let repo = f.0.join("parent");
        let child = repo.join("libs/with spaces");
        git(
            &child,
            &[
                "-c",
                "protocol.file.allow=always",
                "submodule",
                "add",
                "--",
                f.0.join("child").to_str().unwrap(),
                "nested",
            ],
        );
        assert_eq!(list(&repo, false).unwrap().len(), 1);
        let modules = list(&repo, true).unwrap();
        assert_eq!(modules.len(), 2);
        assert_eq!(modules[1].depth, 1);
        let nested = child.join("nested");
        fs::write(nested.join("file.txt"), "nested change\n").unwrap();
        git(
            &nested,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "nested",
            ],
        );
        operate(&repo, "libs/with spaces/nested", "stage", true).unwrap();
        let modules = list(&repo, true).unwrap();
        assert_eq!(
            modules[1].local_commit.as_deref(),
            Some(modules[1].recorded_commit.as_str())
        );
    }
    #[test]
    fn submodules_add_existing_clone_and_handle_literal_pathspecs() {
        let f = fixture();
        let repo = f.0.join("parent");
        let source = f.0.join("child");
        git(
            &repo,
            &["clone", "--", source.to_str().unwrap(), "libs/[sdk]"],
        );
        add(&repo, source.to_str().unwrap(), "libs/[sdk]", None).unwrap();
        let modules = list(&repo, false).unwrap();
        let added = modules.iter().find(|m| m.path == "libs/[sdk]").unwrap();
        assert_eq!(added.url, source.to_string_lossy());
        let child = repo.join("libs/[sdk]");
        fs::write(child.join("file.txt"), "new version\n").unwrap();
        git(
            &child,
            &[
                "-c",
                "user.name=Test",
                "-c",
                "user.email=test@example.com",
                "commit",
                "-qam",
                "new version",
            ],
        );
        operate(&repo, "libs/[sdk]", "update", false).unwrap();
        assert_eq!(
            fs::read_to_string(child.join("file.txt")).unwrap(),
            "first\n"
        );
        operate(&repo, "libs/[sdk]", "sync", false).unwrap();
        let staged = run_git(&repo, &["diff", "--cached", "--name-only"]).unwrap();
        assert!(String::from_utf8_lossy(&staged).contains(".gitmodules"));
    }

    #[test]
    fn submodules_reject_invalid_paths_and_unknown_actions() {
        let f = fixture();
        let repo = f.0.join("parent");
        for path in ["", "../child", "/tmp/outside", "-option"] {
            assert!(safe_path(&repo, path).is_err());
        }
        assert!(operate(&repo, "missing", "stage", false).is_err());
        assert!(operate(&repo, "libs/with spaces", "invalid", false).is_err());
        assert!(add(&repo, "-option", "libs/new", None).is_err());
        #[cfg(unix)]
        {
            std::os::unix::fs::symlink(f.0.join("child"), repo.join("outside")).unwrap();
            assert!(safe_path(&repo, "outside/new").is_err());
        }
    }
}