bijux-cli 0.3.4

#![forbid(unsafe_code)]
//! Mutable installation state helpers.

use std::io::Write as _;
use std::path::{Path, PathBuf};
use std::{fs, io};

use super::compatibility::CompatibilityError;
use super::io::atomic_write_text;

/// Acquire process lock for mutable state operations.
pub fn acquire_state_lock(lock_path: &Path) -> Result<StateLockGuard, CompatibilityError> {
    if let Some(parent) = lock_path.parent() {
        fs::create_dir_all(parent)?;
    }

    match fs::OpenOptions::new().create_new(true).write(true).open(lock_path) {
        Ok(mut file) => {
            file.write_all(b"bijux-cli lock\n")?;
            file.sync_all()?;
            Ok(StateLockGuard { path: lock_path.to_path_buf() })
        }
        Err(error) if error.kind() == io::ErrorKind::AlreadyExists => {
            Err(CompatibilityError::LockHeld(lock_path.to_path_buf()))
        }
        Err(error) => Err(CompatibilityError::Io(error)),
    }
}

/// Guard that removes the lock path when dropped.
#[derive(Debug)]
pub struct StateLockGuard {
    path: PathBuf,
}

impl Drop for StateLockGuard {
    fn drop(&mut self) {
        let _ = fs::remove_file(&self.path);
    }
}

/// Ensure history file exists and parent directory is present.
pub fn ensure_history_file(path: &Path) -> Result<(), CompatibilityError> {
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent)?;
    }

    match fs::symlink_metadata(path) {
        Ok(metadata) => {
            if metadata.file_type().is_symlink() && fs::metadata(path).is_err() {
                return Err(CompatibilityError::Io(io::Error::new(
                    io::ErrorKind::InvalidInput,
                    format!("history path is a broken symlink: {}", path.display()),
                )));
            }
            if !metadata.file_type().is_file() {
                return Err(CompatibilityError::Io(io::Error::new(
                    io::ErrorKind::InvalidInput,
                    format!("history path is not a regular file: {}", path.display()),
                )));
            }
        }
        Err(error) if error.kind() == io::ErrorKind::NotFound => {
            let mut file = fs::OpenOptions::new().create_new(true).write(true).open(path)?;
            file.write_all(b"[]\n")?;
            file.sync_all()?;
        }
        Err(error) => return Err(CompatibilityError::Io(error)),
    }

    if fs::metadata(path)?.len() == 0 {
        let mut file =
            fs::OpenOptions::new().write(true).truncate(true).create(false).open(path)?;
        file.write_all(b"[]\n")?;
        file.sync_all()?;
    }

    Ok(())
}

/// Ensure plugin directory exists.
pub fn ensure_plugins_dir(path: &Path) -> Result<(), CompatibilityError> {
    fs::create_dir_all(path)?;
    Ok(())
}

/// Apply deterministic compatibility migrations to config text.
pub fn run_config_migrations(
    config_path: &Path,
    current_version: u32,
) -> Result<(), CompatibilityError> {
    if current_version == 0 || !config_path.exists() {
        return Ok(());
    }

    let text = fs::read_to_string(config_path)?;
    let mut migrated = text.clone();

    // Normalize UTF-8 BOM and mixed line endings to keep parser behavior stable.
    if let Some(stripped) = migrated.strip_prefix('\u{feff}') {
        migrated = stripped.to_string();
    }
    migrated = migrated.replace("\r\n", "\n").replace('\r', "\n");

    if migrated != text {
        atomic_write_text(config_path, &migrated)?;
    }

    Ok(())
}

#[cfg(test)]
mod tests {
    use std::fs;
    use std::path::PathBuf;
    use std::time::{SystemTime, UNIX_EPOCH};

    use super::super::compatibility::CompatibilityError;
    use super::{acquire_state_lock, ensure_history_file, run_config_migrations};

    fn make_temp_dir(name: &str) -> PathBuf {
        let nanos = SystemTime::now().duration_since(UNIX_EPOCH).expect("clock").as_nanos();
        let path = std::env::temp_dir().join(format!("bijux-install-state-{name}-{nanos}"));
        fs::create_dir_all(&path).expect("mkdir");
        path
    }

    #[test]
    fn lock_contention_reports_lock_held_and_unlocks_on_drop() {
        let temp = make_temp_dir("lock-contention");
        let lock_path = temp.join("state.lock");

        let guard = acquire_state_lock(&lock_path).expect("first lock");
        assert!(lock_path.exists(), "lock file should be created");
        let content = fs::read_to_string(&lock_path).expect("lock content");
        assert!(content.contains("bijux-cli lock"));
        let err = acquire_state_lock(&lock_path).expect_err("second lock should fail");
        assert!(matches!(err, CompatibilityError::LockHeld(_)));

        drop(guard);
        assert!(!lock_path.exists(), "lock file should be removed on drop");

        let _guard2 = acquire_state_lock(&lock_path).expect("lock should be reusable after drop");
    }

    #[test]
    fn config_migrations_normalize_line_endings_and_bom() {
        let temp = make_temp_dir("config-migrations");
        let path = temp.join("config.env");
        fs::write(&path, "\u{feff}BIJUXCLI_ALPHA=1\r\nBIJUXCLI_BETA=2\r").expect("seed");

        run_config_migrations(&path, 1).expect("migrate");

        let migrated = fs::read_to_string(&path).expect("read migrated");
        assert_eq!(migrated, "BIJUXCLI_ALPHA=1\nBIJUXCLI_BETA=2\n");
    }

    #[test]
    fn ensure_history_file_rejects_directory_paths() {
        let temp = make_temp_dir("history-dir-shape");
        let path = temp.join("history");
        fs::create_dir_all(&path).expect("seed directory");
        let err = ensure_history_file(&path).expect_err("must fail");
        assert!(matches!(err, CompatibilityError::Io(_)));
    }

    #[test]
    fn ensure_history_file_initializes_empty_files() {
        let temp = make_temp_dir("history-empty");
        let path = temp.join("history.json");
        fs::write(&path, "").expect("seed empty");
        ensure_history_file(&path).expect("ensure");
        let text = fs::read_to_string(path).expect("read");
        assert_eq!(text, "[]\n");
    }

    #[cfg(unix)]
    #[test]
    fn ensure_history_file_rejects_broken_symlink_paths() {
        use std::os::unix::fs::symlink;

        let temp = make_temp_dir("history-broken-link");
        let path = temp.join("history.json");
        symlink("/tmp/does-not-exist-bijux-history-install", &path).expect("symlink");
        let err = ensure_history_file(&path).expect_err("must fail");
        assert!(matches!(err, CompatibilityError::Io(_)));
    }
}