leviath-cli 0.3.8

//! `lev pack` - Bundle an agent project for distribution.

use clap::Args;
use leviath_package::AgentBundler;
use std::path::{Path, PathBuf};

use leviath_core::manifest::parse_manifest;

/// Arguments for `lev pack`.
#[derive(Args)]
pub struct PackArgs {
    /// Path to agent project (default: current directory)
    #[arg(value_name = "PATH")]
    pub path: Option<String>,

    /// Output file path (default: {name}-{version}.leviath-bundle)
    #[arg(short, long)]
    pub output: Option<String>,
}

/// Run `lev pack`: build a distributable bundle from an agent directory.
pub async fn execute(args: PackArgs) -> anyhow::Result<()> {
    execute_with_bundle(args, &|dir| AgentBundler::new().bundle(dir)).await
}

/// [`execute`] with an injectable bundling operation.
///
/// The `bundle` closure is a trait object so its failure arm (`bundler.bundle`
/// erroring) can be exercised on every platform. Reaching that arm through the
/// real bundler requires the directory walk itself to fail, which is only
/// possible OS-agnostically via injection inside `leviath-package`; here the
/// simpler seam is to inject the whole bundle step. Production always passes
/// the real `AgentBundler`.
async fn execute_with_bundle(
    args: PackArgs,
    bundle: &dyn Fn(&Path) -> anyhow::Result<Vec<u8>>,
) -> anyhow::Result<()> {
    let path = args.path.unwrap_or_else(|| ".".to_string());
    let project_path = Path::new(&path);

    tracing::info!("Packing agent");

    // Find and parse agent.leviath to get name + version
    let manifest_path = find_manifest(project_path)?;
    let manifest_content = std::fs::read_to_string(&manifest_path)
        .map_err(|e| anyhow::anyhow!("Failed to read manifest: {}", e))?;
    let blueprint = parse_manifest(&manifest_content)?;

    println!("Packing agent: {} v{}", blueprint.name, blueprint.version);

    // Determine output path
    let output_path =
        determine_output_path(args.output.as_deref(), &blueprint.name, &blueprint.version);

    // Bundle the project
    let project_dir = manifest_path.parent().unwrap_or(Path::new("."));

    let data = bundle(project_dir)?;
    let bundle_size = data.len();

    std::fs::write(&output_path, &data).map_err(|e| {
        anyhow::anyhow!(
            "Failed to write bundle to '{}': {}",
            output_path.display(),
            e
        )
    })?;

    // Print summary
    println!("Bundle written to: {}", output_path.display());
    println!("Bundle size: {}", format_size(bundle_size));

    // List contents summary
    println!("\nContents:");
    let file_count = count_files(project_dir);
    println!("  {} files bundled", file_count);
    println!("  Manifest: agent.leviath");

    let scripts_dir = project_dir.join("scripts");
    if scripts_dir.exists() {
        let script_count = count_files(&scripts_dir);
        println!("  Scripts: {} files", script_count);
    }

    let tests_dir = project_dir.join("tests");
    if tests_dir.exists() {
        let test_count = count_files(&tests_dir);
        println!("  Tests: {} files", test_count);
    }

    println!("\nDone! Install with: lev add {}", output_path.display());

    Ok(())
}

/// Resolves the bundle output path.
fn determine_output_path(output: Option<&str>, name: &str, version: &str) -> PathBuf {
    match output {
        Some(out) => PathBuf::from(out),
        None => PathBuf::from(format!("{}-{}.leviath-bundle", name, version)),
    }
}

fn find_manifest(project_path: &Path) -> anyhow::Result<PathBuf> {
    find_manifest_with_cwd(project_path, &std::env::current_dir().unwrap_or_default())
}

fn find_manifest_with_cwd(project_path: &Path, cwd: &Path) -> anyhow::Result<PathBuf> {
    if project_path.is_file()
        && project_path.file_name() == Some(std::ffi::OsStr::new("agent.leviath"))
    {
        return Ok(project_path.to_path_buf());
    }

    if project_path.is_dir() {
        let manifest = project_path.join("agent.leviath");
        if manifest.exists() {
            return Ok(manifest);
        }
    }

    let current_manifest = cwd.join("agent.leviath");
    if current_manifest.exists() {
        return Ok(current_manifest);
    }

    anyhow::bail!(
        "Could not find agent.leviath in {} or current directory",
        project_path.display()
    )
}

fn format_size(bytes: usize) -> String {
    if bytes < 1024 {
        format!("{} B", bytes)
    } else if bytes < 1024 * 1024 {
        format!("{:.1} KB", bytes as f64 / 1024.0)
    } else {
        format!("{:.1} MB", bytes as f64 / (1024.0 * 1024.0))
    }
}

/// The real directory reader used in production. A named function (rather than
/// an inline closure) so tests that need to pass a reader which their code path
/// never actually invokes don't introduce an uncovered closure-body region.
fn real_read_dir(p: &Path) -> std::io::Result<std::fs::ReadDir> {
    std::fs::read_dir(p)
}

/// Count files in `dir` recursively; returns 0 on I/O errors.
fn count_files(dir: &Path) -> usize {
    count_files_with(dir, &real_read_dir)
}

/// [`count_files`] with an injectable directory reader so the "read_dir failed
/// on an existing directory -> return the count so far" arm can be exercised
/// deterministically on every platform. That arm is otherwise only reachable
/// via a `chmod 0o000` directory (Unix-only). A trait object (not `impl Fn`)
/// keeps every caller sharing one monomorphization. Production always passes
/// `std::fs::read_dir`.
fn count_files_with(
    dir: &Path,
    read_dir: &dyn Fn(&Path) -> std::io::Result<std::fs::ReadDir>,
) -> usize {
    let mut count = 0;
    if dir.is_dir()
        && let Ok(entries) = read_dir(dir)
    {
        for entry in entries.filter_map(|e| e.ok()) {
            count += count_path(&entry.path(), read_dir);
        }
    }
    count
}

/// Count the files contributed by a single walked path: 1 for a regular file,
/// the recursive count for a directory, and 0 for anything else (a broken
/// symlink, a special file, or a path that vanished mid-walk). Split out so the
/// "neither a file nor a directory" arm is testable OS-agnostically (a
/// nonexistent path is neither), rather than only via a Unix broken symlink.
fn count_path(path: &Path, read_dir: &dyn Fn(&Path) -> std::io::Result<std::fs::ReadDir>) -> usize {
    if path.is_file() {
        1
    } else if path.is_dir() {
        count_files_with(path, read_dir)
    } else {
        0
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_support::with_tracing;

    // ─── tracing subscriber ────────────────────────────────────────────────
    //
    // Without a registered subscriber, `tracing::info!`'s macro expansion
    // short-circuits field evaluation before the "is level enabled" check
    // runs, so field-expression lines show as uncovered even though the
    // surrounding branch executes. Each test below calls `with_tracing(|| {})`
    // once as a bare statement (rather than wrapping the whole test body) to
    // install the shared `AlwaysOnSubscriber` (see `crate::test_support`) as
    // the process-wide default before the rest of the test runs.

    // ─── format_size ───────────────────────────────────────────────────────

    #[test]
    fn format_size_bytes() {
        assert_eq!(format_size(0), "0 B");
        assert_eq!(format_size(512), "512 B");
        assert_eq!(format_size(1023), "1023 B");
    }

    #[test]
    fn format_size_kilobytes() {
        assert_eq!(format_size(1024), "1.0 KB");
        assert_eq!(format_size(2048), "2.0 KB");
        assert_eq!(format_size(1536), "1.5 KB");
    }

    #[test]
    fn format_size_megabytes() {
        assert_eq!(format_size(1024 * 1024), "1.0 MB");
        assert_eq!(format_size(5 * 1024 * 1024), "5.0 MB");
    }

    // ─── count_files ───────────────────────────────────────────────────────

    #[test]
    fn count_files_empty_dir() {
        let dir = tempfile::tempdir().unwrap();
        assert_eq!(count_files(dir.path()), 0);
    }

    #[test]
    fn count_files_with_files() {
        let dir = tempfile::tempdir().unwrap();
        std::fs::write(dir.path().join("a.txt"), "a").unwrap();
        std::fs::write(dir.path().join("b.txt"), "b").unwrap();
        assert_eq!(count_files(dir.path()), 2);
    }

    #[test]
    fn count_files_nested() {
        let dir = tempfile::tempdir().unwrap();
        std::fs::write(dir.path().join("top.txt"), "t").unwrap();
        std::fs::create_dir_all(dir.path().join("sub")).unwrap();
        std::fs::write(dir.path().join("sub/nested.txt"), "n").unwrap();
        assert_eq!(count_files(dir.path()), 2);
    }

    #[test]
    fn count_files_non_directory_returns_zero() {
        let dir = tempfile::tempdir().unwrap();
        let file = dir.path().join("a.txt");
        std::fs::write(&file, "hello").unwrap();
        assert_eq!(count_files(&file), 0);
    }

    #[test]
    fn count_files_read_dir_error_returns_zero() {
        // An injected `read_dir` that fails on an existing directory exercises
        // the "read_dir errored -> keep the count so far" arm deterministically
        // on every platform.
        let dir = tempfile::tempdir().unwrap();
        let result = count_files_with(dir.path(), &|_| {
            Err(std::io::Error::other("simulated read_dir failure"))
        });
        assert_eq!(result, 0);
    }

    #[test]
    fn count_path_neither_file_nor_dir_counts_zero() {
        // A nonexistent path is neither a file nor a directory, so `count_path`
        // contributes 0 - covering the `else` arm on every platform.
        let dir = tempfile::tempdir().unwrap();
        let missing = dir.path().join("does-not-exist");
        assert_eq!(count_path(&missing, &real_read_dir), 0);
    }

    // ─── find_manifest ─────────────────────────────────────────────────────

    #[test]
    fn find_manifest_in_directory() {
        let dir = tempfile::tempdir().unwrap();
        let manifest = dir.path().join("agent.leviath");
        std::fs::write(&manifest, "name = \"test\"").unwrap();
        let result = find_manifest(dir.path());
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), manifest);
    }

    #[test]
    fn find_manifest_direct_file() {
        let dir = tempfile::tempdir().unwrap();
        let manifest = dir.path().join("agent.leviath");
        std::fs::write(&manifest, "name = \"test\"").unwrap();
        let result = find_manifest(&manifest);
        assert!(result.is_ok());
        assert_eq!(result.unwrap(), manifest);
    }

    #[test]
    fn find_manifest_not_found_errors() {
        let dir = tempfile::tempdir().unwrap();
        let result = find_manifest(dir.path());
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("agent.leviath"));
    }

    // ─── find_manifest_with_cwd ────────────────────────────────────────────

    #[test]
    fn find_manifest_with_cwd_finds_in_directory() {
        let dir = tempfile::tempdir().unwrap();
        let manifest = dir.path().join("agent.leviath");
        std::fs::write(&manifest, "name = \"test\"").unwrap();
        let cwd = tempfile::tempdir().unwrap();
        let result = find_manifest_with_cwd(dir.path(), cwd.path());
        assert_eq!(result.unwrap(), manifest);
    }

    #[test]
    fn find_manifest_with_cwd_finds_direct_file() {
        let dir = tempfile::tempdir().unwrap();
        let manifest = dir.path().join("agent.leviath");
        std::fs::write(&manifest, "name = \"test\"").unwrap();
        let cwd = tempfile::tempdir().unwrap();
        let result = find_manifest_with_cwd(&manifest, cwd.path());
        assert_eq!(result.unwrap(), manifest);
    }

    #[test]
    fn find_manifest_with_cwd_falls_back_to_cwd() {
        let empty_dir = tempfile::tempdir().unwrap();
        let cwd_dir = tempfile::tempdir().unwrap();
        let cwd_manifest = cwd_dir.path().join("agent.leviath");
        std::fs::write(&cwd_manifest, "name = \"test\"").unwrap();
        let result = find_manifest_with_cwd(empty_dir.path(), cwd_dir.path());
        assert_eq!(result.unwrap(), cwd_manifest);
    }

    #[test]
    fn find_manifest_with_cwd_errors_when_not_found() {
        let empty_project = tempfile::tempdir().unwrap();
        let empty_cwd = tempfile::tempdir().unwrap();
        let result = find_manifest_with_cwd(empty_project.path(), empty_cwd.path());
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("agent.leviath"));
    }

    // ─── output path determination ─────────────────────────────────────────

    #[test]
    fn output_path_from_args() {
        let output_path =
            determine_output_path(Some("my-output.leviath-bundle"), "my-agent", "1.0.0");
        assert_eq!(output_path, PathBuf::from("my-output.leviath-bundle"));
    }

    #[test]
    fn output_path_default() {
        let output_path = determine_output_path(None, "my-agent", "1.0.0");
        assert_eq!(output_path, PathBuf::from("my-agent-1.0.0.leviath-bundle"));
    }

    // ─── format_size edge cases ───────────────────────────────────────────

    #[test]
    fn format_size_boundary_kb() {
        assert_eq!(format_size(1023), "1023 B");
        assert_eq!(format_size(1024), "1.0 KB");
    }

    #[test]
    fn format_size_boundary_mb() {
        assert_eq!(format_size(1024 * 1024 - 1), "1024.0 KB");
        assert_eq!(format_size(1024 * 1024), "1.0 MB");
    }

    #[test]
    fn format_size_fractional_kb() {
        assert_eq!(format_size(1536), "1.5 KB");
        assert_eq!(format_size(2560), "2.5 KB");
    }

    // ─── count_files edge cases ───────────────────────────────────────────

    #[test]
    fn count_files_nested_multiple_levels() {
        let dir = tempfile::tempdir().unwrap();
        std::fs::create_dir_all(dir.path().join("a/b/c")).unwrap();
        std::fs::write(dir.path().join("root.txt"), "r").unwrap();
        std::fs::write(dir.path().join("a/level1.txt"), "1").unwrap();
        std::fs::write(dir.path().join("a/b/level2.txt"), "2").unwrap();
        std::fs::write(dir.path().join("a/b/c/level3.txt"), "3").unwrap();
        assert_eq!(count_files(dir.path()), 4);
    }

    // ─── find_manifest edge cases ─────────────────────────────────────────

    #[test]
    fn find_manifest_nonexistent_path_errors() {
        let result = find_manifest(Path::new("/tmp/nonexistent-leviath-test-dir"));
        assert!(result.is_err());
    }

    // ─── output path generation ───────────────────────────────────────────

    #[test]
    fn output_path_with_special_chars() {
        let output_path = determine_output_path(None, "my-agent", "1.0.0-beta.1");
        assert_eq!(
            output_path,
            PathBuf::from("my-agent-1.0.0-beta.1.leviath-bundle")
        );
    }

    // ─── execute ─────────────────────────────────────────────────────────

    fn make_project_dir(with_scripts: bool, with_tests: bool) -> tempfile::TempDir {
        let dir = tempfile::tempdir().unwrap();
        std::fs::write(
            dir.path().join("agent.leviath"),
            "[agent]\nname = \"packed-agent\"\nversion = \"1.0.0\"\ndescription = \"d\"\n",
        )
        .unwrap();
        if with_scripts {
            std::fs::create_dir_all(dir.path().join("scripts")).unwrap();
            std::fs::write(dir.path().join("scripts/run.sh"), "#!/bin/sh\n").unwrap();
        }
        if with_tests {
            std::fs::create_dir_all(dir.path().join("tests")).unwrap();
            std::fs::write(dir.path().join("tests/test1.txt"), "test").unwrap();
        }
        dir
    }

    #[tokio::test]
    async fn execute_packs_project_to_explicit_output() {
        with_tracing(|| {});
        let project = make_project_dir(false, false);
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        execute(args).await.unwrap();
        assert!(output_path.exists());
        assert!(std::fs::metadata(&output_path).unwrap().len() > 0);
    }

    #[tokio::test]
    async fn execute_with_scripts_and_tests_dirs() {
        with_tracing(|| {});
        let project = make_project_dir(true, true);
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        execute(args).await.unwrap();
        assert!(output_path.exists());
    }

    #[tokio::test]
    async fn execute_missing_manifest_errors() {
        with_tracing(|| {});
        let project = tempfile::tempdir().unwrap();
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        let err = execute(args).await.unwrap_err();
        assert!(err.to_string().contains("Could not find agent.leviath"));
    }

    #[tokio::test]
    async fn execute_unwritable_output_path_errors() {
        with_tracing(|| {});
        let project = make_project_dir(false, false);
        let output_path = project
            .path()
            .join("nonexistent-subdir")
            .join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        let err = execute(args).await.unwrap_err();
        assert!(err.to_string().contains("Failed to write bundle"));
    }

    #[tokio::test]
    async fn execute_with_path_none_falls_back_to_dot() {
        // args.path = None triggers the unwrap_or_else closure on line 21.
        with_tracing(|| {});
        let args = PackArgs {
            path: None,
            output: None,
        };
        let err = execute(args).await.unwrap_err();
        assert!(err.to_string().contains("agent.leviath"));
    }

    #[tokio::test]
    async fn execute_invalid_manifest_toml_errors() {
        // Manifest exists but is invalid TOML - covers parse_manifest ? on line 30.
        with_tracing(|| {});
        let project = tempfile::tempdir().unwrap();
        std::fs::write(project.path().join("agent.leviath"), "not valid toml ][").unwrap();
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        execute(args).await.unwrap_err();
    }

    #[tokio::test]
    async fn execute_unreadable_manifest_errors() {
        // `agent.leviath` exists but is a *directory*: `find_manifest` returns
        // it (exists() passes), then `read_to_string` fails on every platform,
        // covering the "Failed to read manifest" map_err arm.
        with_tracing(|| {});
        let project = tempfile::tempdir().unwrap();
        std::fs::create_dir_all(project.path().join("agent.leviath")).unwrap();
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        let e = execute(args).await.unwrap_err();
        assert!(e.to_string().contains("Failed to read manifest"));
    }

    #[tokio::test]
    async fn execute_bundle_error_propagated() {
        // Inject a bundling op that fails, covering the `bundle(project_dir)?`
        // error arm on every platform.
        with_tracing(|| {});
        let project = make_project_dir(false, false);
        let output_dir = tempfile::tempdir().unwrap();
        let output_path = output_dir.path().join("out.leviath-bundle");
        let args = PackArgs {
            path: Some(project.path().to_str().unwrap().to_string()),
            output: Some(output_path.to_str().unwrap().to_string()),
        };
        let result =
            execute_with_bundle(args, &|_| Err(anyhow::anyhow!("simulated bundle failure"))).await;
        let e = result.unwrap_err();
        assert!(e.to_string().contains("simulated bundle failure"));
    }
}