//! Paths to locations used by Zed.

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

pub use util::paths::home_dir;

/// Returns the relative path to the zed_server directory on the ssh host.
pub fn remote_server_dir_relative() -> &'static Path {
    Path::new(".zed_server")
}

/// Returns the path to the configuration directory used by Zed.
pub fn config_dir() -> &'static PathBuf {
    static CONFIG_DIR: OnceLock<PathBuf> = OnceLock::new();
    CONFIG_DIR.get_or_init(|| {
        if cfg!(target_os = "windows") {
            return dirs::config_dir()
                .expect("failed to determine RoamingAppData directory")
                .join("Zed");
        }

        if cfg!(target_os = "linux") {
            return if let Ok(flatpak_xdg_config) = std::env::var("FLATPAK_XDG_CONFIG_HOME") {
                flatpak_xdg_config.into()
            } else {
                dirs::config_dir().expect("failed to determine XDG_CONFIG_HOME directory")
            }
            .join("zed");
        }

        home_dir().join(".config").join("zed")
    })
}

/// Returns the path to the support directory used by Zed.
pub fn support_dir() -> &'static PathBuf {
    static SUPPORT_DIR: OnceLock<PathBuf> = OnceLock::new();
    SUPPORT_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            return home_dir().join("Library/Application Support/Zed");
        }

        if cfg!(target_os = "linux") {
            return if let Ok(flatpak_xdg_data) = std::env::var("FLATPAK_XDG_DATA_HOME") {
                flatpak_xdg_data.into()
            } else {
                dirs::data_local_dir().expect("failed to determine XDG_DATA_HOME directory")
            }
            .join("zed");
        }

        if cfg!(target_os = "windows") {
            return dirs::data_local_dir()
                .expect("failed to determine LocalAppData directory")
                .join("Zed");
        }

        config_dir().clone()
    })
}

/// Returns the path to the temp directory used by Zed.
pub fn temp_dir() -> &'static PathBuf {
    static TEMP_DIR: OnceLock<PathBuf> = OnceLock::new();
    TEMP_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            return dirs::cache_dir()
                .expect("failed to determine cachesDirectory directory")
                .join("Zed");
        }

        if cfg!(target_os = "windows") {
            return dirs::cache_dir()
                .expect("failed to determine LocalAppData directory")
                .join("Zed");
        }

        if cfg!(target_os = "linux") {
            return if let Ok(flatpak_xdg_cache) = std::env::var("FLATPAK_XDG_CACHE_HOME") {
                flatpak_xdg_cache.into()
            } else {
                dirs::cache_dir().expect("failed to determine XDG_CACHE_HOME directory")
            }
            .join("zed");
        }

        home_dir().join(".cache").join("zed")
    })
}

/// Returns the path to the logs directory.
pub fn logs_dir() -> &'static PathBuf {
    static LOGS_DIR: OnceLock<PathBuf> = OnceLock::new();
    LOGS_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            home_dir().join("Library/Logs/Zed")
        } else {
            support_dir().join("logs")
        }
    })
}

/// Returns the path to the Zed server directory on this SSH host.
pub fn remote_server_state_dir() -> &'static PathBuf {
    static REMOTE_SERVER_STATE: OnceLock<PathBuf> = OnceLock::new();
    REMOTE_SERVER_STATE.get_or_init(|| support_dir().join("server_state"))
}

/// Returns the path to the `Zed.log` file.
pub fn log_file() -> &'static PathBuf {
    static LOG_FILE: OnceLock<PathBuf> = OnceLock::new();
    LOG_FILE.get_or_init(|| logs_dir().join("Zed.log"))
}

/// Returns the path to the `Zed.log.old` file.
pub fn old_log_file() -> &'static PathBuf {
    static OLD_LOG_FILE: OnceLock<PathBuf> = OnceLock::new();
    OLD_LOG_FILE.get_or_init(|| logs_dir().join("Zed.log.old"))
}

/// Returns the path to the database directory.
pub fn database_dir() -> &'static PathBuf {
    static DATABASE_DIR: OnceLock<PathBuf> = OnceLock::new();
    DATABASE_DIR.get_or_init(|| support_dir().join("db"))
}

/// Returns the path to the crashes directory, if it exists for the current platform.
pub fn crashes_dir() -> &'static Option<PathBuf> {
    static CRASHES_DIR: OnceLock<Option<PathBuf>> = OnceLock::new();
    CRASHES_DIR.get_or_init(|| {
        cfg!(target_os = "macos").then_some(home_dir().join("Library/Logs/DiagnosticReports"))
    })
}

/// Returns the path to the retired crashes directory, if it exists for the current platform.
pub fn crashes_retired_dir() -> &'static Option<PathBuf> {
    static CRASHES_RETIRED_DIR: OnceLock<Option<PathBuf>> = OnceLock::new();
    CRASHES_RETIRED_DIR.get_or_init(|| crashes_dir().as_ref().map(|dir| dir.join("Retired")))
}

/// Returns the path to the `settings.json` file.
pub fn settings_file() -> &'static PathBuf {
    static SETTINGS_FILE: OnceLock<PathBuf> = OnceLock::new();
    SETTINGS_FILE.get_or_init(|| config_dir().join("settings.json"))
}

/// Returns the path to the `keymap.json` file.
pub fn keymap_file() -> &'static PathBuf {
    static KEYMAP_FILE: OnceLock<PathBuf> = OnceLock::new();
    KEYMAP_FILE.get_or_init(|| config_dir().join("keymap.json"))
}

/// Returns the path to the `tasks.json` file.
pub fn tasks_file() -> &'static PathBuf {
    static TASKS_FILE: OnceLock<PathBuf> = OnceLock::new();
    TASKS_FILE.get_or_init(|| config_dir().join("tasks.json"))
}

/// Returns the path to the extensions directory.
///
/// This is where installed extensions are stored.
pub fn extensions_dir() -> &'static PathBuf {
    static EXTENSIONS_DIR: OnceLock<PathBuf> = OnceLock::new();
    EXTENSIONS_DIR.get_or_init(|| support_dir().join("extensions"))
}

/// Returns the path to the themes directory.
///
/// This is where themes that are not provided by extensions are stored.
pub fn themes_dir() -> &'static PathBuf {
    static THEMES_DIR: OnceLock<PathBuf> = OnceLock::new();
    THEMES_DIR.get_or_init(|| config_dir().join("themes"))
}

/// Returns the path to the contexts directory.
///
/// This is where the saved contexts from the Assistant are stored.
pub fn contexts_dir() -> &'static PathBuf {
    static CONTEXTS_DIR: OnceLock<PathBuf> = OnceLock::new();
    CONTEXTS_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            config_dir().join("conversations")
        } else {
            support_dir().join("conversations")
        }
    })
}

/// Returns the path to the contexts directory.
///
/// This is where the prompts for use with the Assistant are stored.
pub fn prompts_dir() -> &'static PathBuf {
    static PROMPTS_DIR: OnceLock<PathBuf> = OnceLock::new();
    PROMPTS_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            config_dir().join("prompts")
        } else {
            support_dir().join("prompts")
        }
    })
}

/// Returns the path to the prompt templates directory.
///
/// This is where the prompt templates for core features can be overridden with templates.
///
/// # Arguments
///
/// * `dev_mode` - If true, assumes the current working directory is the Zed repository.
pub fn prompt_overrides_dir(repo_path: Option<&Path>) -> PathBuf {
    if let Some(path) = repo_path {
        let dev_path = path.join("assets").join("prompts");
        if dev_path.exists() {
            return dev_path;
        }
    }

    static PROMPT_TEMPLATES_DIR: OnceLock<PathBuf> = OnceLock::new();
    PROMPT_TEMPLATES_DIR
        .get_or_init(|| {
            if cfg!(target_os = "macos") {
                config_dir().join("prompt_overrides")
            } else {
                support_dir().join("prompt_overrides")
            }
        })
        .clone()
}

/// Returns the path to the semantic search's embeddings directory.
///
/// This is where the embeddings used to power semantic search are stored.
pub fn embeddings_dir() -> &'static PathBuf {
    static EMBEDDINGS_DIR: OnceLock<PathBuf> = OnceLock::new();
    EMBEDDINGS_DIR.get_or_init(|| {
        if cfg!(target_os = "macos") {
            config_dir().join("embeddings")
        } else {
            support_dir().join("embeddings")
        }
    })
}

/// Returns the path to the languages directory.
///
/// This is where language servers are downloaded to for languages built-in to Zed.
pub fn languages_dir() -> &'static PathBuf {
    static LANGUAGES_DIR: OnceLock<PathBuf> = OnceLock::new();
    LANGUAGES_DIR.get_or_init(|| support_dir().join("languages"))
}

/// Returns the path to the Copilot directory.
pub fn copilot_dir() -> &'static PathBuf {
    static COPILOT_DIR: OnceLock<PathBuf> = OnceLock::new();
    COPILOT_DIR.get_or_init(|| support_dir().join("copilot"))
}

/// Returns the path to the Supermaven directory.
pub fn supermaven_dir() -> &'static PathBuf {
    static SUPERMAVEN_DIR: OnceLock<PathBuf> = OnceLock::new();
    SUPERMAVEN_DIR.get_or_init(|| support_dir().join("supermaven"))
}

/// Returns the path to the default Prettier directory.
pub fn default_prettier_dir() -> &'static PathBuf {
    static DEFAULT_PRETTIER_DIR: OnceLock<PathBuf> = OnceLock::new();
    DEFAULT_PRETTIER_DIR.get_or_init(|| support_dir().join("prettier"))
}

/// Returns the path to the remote server binaries directory.
pub fn remote_servers_dir() -> &'static PathBuf {
    static REMOTE_SERVERS_DIR: OnceLock<PathBuf> = OnceLock::new();
    REMOTE_SERVERS_DIR.get_or_init(|| support_dir().join("remote_servers"))
}

/// Returns the relative path to a `.zed` folder within a project.
pub fn local_settings_folder_relative_path() -> &'static Path {
    Path::new(".zed")
}

/// Returns the relative path to a `settings.json` file within a project.
pub fn local_settings_file_relative_path() -> &'static Path {
    Path::new(".zed/settings.json")
}

/// Returns the relative path to a `tasks.json` file within a project.
pub fn local_tasks_file_relative_path() -> &'static Path {
    Path::new(".zed/tasks.json")
}

/// Returns the relative path to a `.vscode/tasks.json` file within a project.
pub fn local_vscode_tasks_file_relative_path() -> &'static Path {
    Path::new(".vscode/tasks.json")
}

/// A default editorconfig file name to use when resolving project settings.
pub const EDITORCONFIG_NAME: &str = ".editorconfig";