mod api;
mod capture;
mod local;
mod manager;
mod schroot;
mod ssh;
mod unshare;

pub use api::{Context, ContextCommand, ContextConfig, LineSink, Stream};
pub use manager::ContextManager;
use std::sync::Arc;

/// Obtain global context manager
pub fn manager() -> &'static ContextManager {
    &manager::MANAGER
}

/// Obtain current context
pub fn current() -> Arc<Context> {
    manager::MANAGER.current()
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs;
    use tempfile::NamedTempFile;

    #[test]
    fn test_ensure_available_local() {
        let temp_dir = tempfile::tempdir().unwrap();
        let src_file = temp_dir.path().join("src.txt");
        fs::write(&src_file, "local").unwrap();

        let ctx = Context::new(ContextConfig::Local);
        let dest = ctx.ensure_available(&src_file, "/tmp").unwrap();

        // Should return a path that exists and has the same content
        assert!(dest.exists());
        let content = fs::read_to_string(&dest).unwrap();
        assert_eq!(content, "local");

        // The dest should be in the /tmp directory
        assert!(dest.starts_with("/tmp"));
    }

    #[test]
    fn test_context_manager_crud() {
        let temp_file = NamedTempFile::new().unwrap();
        let path = temp_file.path().to_path_buf();

        let mgr = ContextManager::with_path(path.clone());

        // Add
        let ssh_cfg = ContextConfig::Ssh {
            host: "10.0.0.1".into(),
            user: Some("admin".into()),
            port: Some(2222),
        };
        mgr.add_context("myserver", ssh_cfg.clone()).unwrap();

        assert!(mgr.list_contexts().contains(&"myserver".to_string()));

        // List
        let list = mgr.list_contexts();
        assert!(list.contains(&"myserver".to_string()));

        // Set Current
        mgr.set_current("myserver").unwrap();
        assert_eq!(mgr.current_name(), "myserver".to_string());

        // Remove
        mgr.remove_context("myserver").unwrap();
        assert!(!mgr.list_contexts().contains(&"myserver".to_string()));
    }

    #[test]
    fn test_persistence() {
        let temp_dir = tempfile::tempdir().unwrap();
        let config_path = temp_dir.path().join("contexts.json");

        {
            let mgr = ContextManager::with_path(config_path.clone());
            mgr.add_context("persistent", ContextConfig::Local).unwrap();
            mgr.set_current("persistent").unwrap();
        }

        let content = fs::read_to_string(&config_path).unwrap();
        let loaded_config: super::manager::Config = serde_json::from_str(&content).unwrap();

        assert_eq!(loaded_config.context, "persistent".to_string());
        assert!(loaded_config.contexts.contains_key("persistent"));
    }

    #[test]
    fn test_context_fallback_on_removal() {
        let temp_file = NamedTempFile::new().unwrap();
        let path = temp_file.path().to_path_buf();
        let mgr = ContextManager::with_path(path);

        // 1. Add and set a context
        mgr.add_context("temp", ContextConfig::Local).unwrap();
        mgr.set_current("temp").unwrap();
        assert_eq!(mgr.current_name(), "temp");

        // 2. Remove it
        mgr.remove_context("temp").unwrap();

        // 3. Should have fallen back to local
        assert_eq!(mgr.current_name(), "local");
        assert!(mgr.list_contexts().contains(&"local".to_string()));
    }

    #[test]
    fn test_context_file_ops() {
        let temp_dir = tempfile::tempdir().unwrap();
        let ctx = Context::new(ContextConfig::Local);

        let file_path = temp_dir.path().join("test.txt");
        let content = "hello world";

        // 1. Write file
        ctx.write_file(&file_path, content).unwrap();

        // 2. Read file
        let read_content = ctx.read_file(&file_path).unwrap();
        assert_eq!(read_content, content);

        // 3. Copy path
        let dest_path = temp_dir.path().join("test_copy.txt");
        ctx.copy_path(&file_path, &dest_path).unwrap();
        let copied_content = ctx.read_file(&dest_path).unwrap();
        assert_eq!(copied_content, content);

        // 4. Recursive copy
        let subdir = temp_dir.path().join("subdir");
        std::fs::create_dir_all(&subdir).unwrap();
        let subfile = subdir.join("subfile.txt");
        ctx.write_file(&subfile, "subcontent").unwrap();

        let subdir_copy = temp_dir.path().join("subdir_copy");
        ctx.copy_path(&subdir, &subdir_copy).unwrap();

        assert!(subdir_copy.exists());
        assert!(subdir_copy.join("subfile.txt").exists());
        assert_eq!(
            ctx.read_file(&subdir_copy.join("subfile.txt")).unwrap(),
            "subcontent"
        );
    }

    /// Copying a tree containing a dangling symlink must reproduce the link
    /// itself rather than failing to follow it (which previously surfaced as
    /// a bare "No such file or directory (os error 2)").
    #[test]
    fn test_context_copy_preserves_dangling_symlink() {
        use std::os::unix::fs::symlink;
        let temp_dir = tempfile::tempdir().unwrap();
        let ctx = Context::new(ContextConfig::Local);

        let src_dir = temp_dir.path().join("src");
        std::fs::create_dir_all(&src_dir).unwrap();
        // A regular file alongside the symlink, to ensure normal copies still work.
        std::fs::write(src_dir.join("real.txt"), "data").unwrap();
        // A dangling symlink pointing to a non-existent target.
        symlink("/nonexistent/target", src_dir.join("dangling")).unwrap();

        let dest_dir = temp_dir.path().join("dest");
        ctx.copy_path(&src_dir, &dest_dir).unwrap();

        // The regular file was copied.
        assert_eq!(ctx.read_file(&dest_dir.join("real.txt")).unwrap(), "data");
        // The symlink was reproduced as a symlink (not followed).
        let meta = std::fs::symlink_metadata(dest_dir.join("dangling")).unwrap();
        assert!(meta.file_type().is_symlink());
        assert_eq!(
            std::fs::read_link(dest_dir.join("dangling")).unwrap(),
            std::path::Path::new("/nonexistent/target")
        );
    }
}