//! CLI view over the unified Maestro config at `~/.config/maestro/config.toml`.
//!
//! Reads `[shared].registry_url` (registry HTTP base) and `[cli].cookie`
//! (persisted `maestro_session` JWT). All other sections in the file are
//! preserved on write.

use std::path::{Path, PathBuf};

use maestro_config::MaestroConfigFile;

pub use maestro_config::CONFIG_PATH_ENV;

/// `~/.config/maestro/config.toml` (XDG-aware).
pub fn default_config_path() -> Result<PathBuf, ConfigError> {
    Ok(maestro_config::default_config_path()?)
}

/// `$MAESTRO_CONFIG` if set, else [`default_config_path`].
pub fn resolve_config_path() -> Result<PathBuf, ConfigError> {
    Ok(maestro_config::resolve_config_path()?)
}

#[derive(Debug, thiserror::Error)]
pub enum ConfigError {
    #[error(transparent)]
    Inner(#[from] maestro_config::ConfigError),
    #[error(
        "no registry URL configured — pass --registry-url, set \
         MAESTRO_REGISTRY_URL, or run `maestro set-registry <url>`"
    )]
    NoRegistryUrl,
}

/// Resolved CLI config — the subset of the unified file that this binary
/// actually consumes.
#[derive(Debug, Clone, Default, PartialEq, Eq)]
pub struct CliConfig {
    pub registry_url: Option<String>,
    pub cookie: Option<String>,
}

impl CliConfig {
    /// Load `[shared].registry_url` + `[cli].cookie` from the unified file.
    /// Returns an empty config if the file is missing — the CLI tolerates a
    /// missing file so `maestro set-registry <url>` can bootstrap it.
    pub fn load(path: &Path) -> Result<Self, ConfigError> {
        let file = MaestroConfigFile::load_or_default(path)?;
        Ok(Self {
            registry_url: file.shared.registry_url,
            cookie: file.cli.cookie,
        })
    }

    /// Persist `[shared].registry_url`. Read-modify-write — preserves
    /// any other sections already in the file (`[daemon]`, `[registry]`,
    /// existing `[cli].cookie`).
    pub fn save_registry_url(path: &Path, url: &str) -> Result<(), ConfigError> {
        let mut file = MaestroConfigFile::load_or_default(path)?;
        file.shared.registry_url = Some(url.to_string());
        file.save(path)?;
        Ok(())
    }

    /// Persist `[cli].cookie`. Same read-modify-write semantics as
    /// [`save_registry_url`]; in particular this does not touch
    /// `[shared].registry_url`.
    pub fn save_cookie(path: &Path, cookie: &str) -> Result<(), ConfigError> {
        let mut file = MaestroConfigFile::load_or_default(path)?;
        file.cli.cookie = Some(cookie.to_string());
        file.save(path)?;
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use maestro_config::SharedSection;

    fn write_file(path: &Path, body: &str) {
        std::fs::write(path, body).unwrap();
    }

    #[test]
    fn missing_file_returns_empty() {
        let dir = tempfile::tempdir().unwrap();
        let cfg = CliConfig::load(&dir.path().join("config.toml")).unwrap();
        assert_eq!(cfg, CliConfig::default());
    }

    #[test]
    fn load_reads_shared_registry_url_and_cli_cookie() {
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("config.toml");
        write_file(
            &path,
            r#"
[shared]
registry_url = "https://r.example"

[cli]
cookie = "eyJ..."
"#,
        );
        let cfg = CliConfig::load(&path).unwrap();
        assert_eq!(cfg.registry_url.as_deref(), Some("https://r.example"));
        assert_eq!(cfg.cookie.as_deref(), Some("eyJ..."));
    }

    #[test]
    fn save_registry_url_preserves_other_sections() {
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("config.toml");
        write_file(
            &path,
            r#"
[shared]
token = "abc"

[daemon]
daemon_url = "ws://laptop:7070"
"#,
        );
        CliConfig::save_registry_url(&path, "https://new.example/").unwrap();
        let after = MaestroConfigFile::load(&path).unwrap();
        assert_eq!(
            after.shared.registry_url.as_deref(),
            Some("https://new.example/")
        );
        assert_eq!(after.shared.token.as_deref(), Some("abc"));
        assert_eq!(after.daemon.daemon_url.as_deref(), Some("ws://laptop:7070"));
    }

    #[test]
    fn save_cookie_does_not_touch_registry_url() {
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("config.toml");
        write_file(
            &path,
            r#"
[shared]
registry_url = "https://r.example"
"#,
        );
        CliConfig::save_cookie(&path, "eyJ.new").unwrap();
        let after = MaestroConfigFile::load(&path).unwrap();
        assert_eq!(
            after.shared.registry_url.as_deref(),
            Some("https://r.example")
        );
        assert_eq!(after.cli.cookie.as_deref(), Some("eyJ.new"));
    }

    #[test]
    fn save_creates_file_if_missing() {
        let dir = tempfile::tempdir().unwrap();
        let path = dir.path().join("nested/config.toml");
        CliConfig::save_registry_url(&path, "https://x").unwrap();
        assert!(path.exists());
        let after = MaestroConfigFile::load(&path).unwrap();
        assert_eq!(
            after,
            MaestroConfigFile {
                shared: SharedSection {
                    registry_url: Some("https://x".into()),
                    token: None,
                },
                ..Default::default()
            }
        );
    }
}