//! OpenIDEA desktop shell: wires the backend crates into Tauri.
//!
//! This crate is glue only. Each `commands/<domain>.rs` is a thin, typed
//! adapter from IPC to a backend crate; no domain logic lives here.

mod commands;
mod events;
mod logging;
mod menu;
mod shell_env;
mod state;
mod windows;

use state::AppState;
use tauri::{Emitter, Manager};
use windows::WindowsState;

/// Builds the tauri-specta builder holding every command and exported type.
/// Also used by `export_bindings` (tests) to regenerate `src/bindings.ts`.
pub fn specta_builder() -> tauri_specta::Builder<tauri::Wry> {
    commands::builder().typ::<ide_core::IdeEvent>().dangerously_cast_bigints_to_number()
}

pub fn export_bindings(builder: &tauri_specta::Builder<tauri::Wry>) {
    builder
        .export(
            specta_typescript::Typescript::default().header("// @ts-nocheck\n/* eslint-disable */\n// Generated by tauri-specta. Do not edit; run `pnpm gen:bindings`."),
            concat!(env!("CARGO_MANIFEST_DIR"), "/../src/bindings.ts"),
        )
        .expect("failed to export TypeScript bindings");
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    ide_workspace::process::mark_start();
    let context = tauri::generate_context!();
    logging::init(&context.config().identifier);

    let refresh_shell_path = shell_env::inherit_login_shell_path(&context.config().identifier);
    // Managed LSP/DAP installs; must run before other threads start and before PATH is cached.
    if let Some(data) = dirs::data_dir() {
        ide_tools::extend_process_path(&data.join(&context.config().identifier));
        ide_dap::adapter::set_tools_root(ide_tools::tools_dir(&data.join(&context.config().identifier)));
    }
    if let Some(refresh) = refresh_shell_path {
        refresh();
    }

    let builder = specta_builder();
    #[cfg(debug_assertions)]
    export_bindings(&builder);

    let app = tauri::Builder::default();
    // Single instance first: a second launch focuses this one and opens its path argument.
    // Release only, so a dev build can run beside an installed release (same identifier).
    #[cfg(not(debug_assertions))]
    let app = app.plugin(tauri_plugin_single_instance::init(windows::on_second_instance));
    let app = app
        .plugin(tauri_plugin_opener::init())
        .plugin(tauri_plugin_dialog::init())
        .plugin(
            tauri_plugin_window_state::Builder::default()
                .with_state_flags(window_state_flags())
                // One remembered geometry shared by every project's settings window.
                .map_label(|l| if windows::is_settings_window(l) { "settings" } else { l })
                .build(),
        )
        // Inert until an endpoint is configured (see `commands::window::app_check_update`).
        .plugin(tauri_plugin_updater::Builder::new().build());
    // E2E automation bridge (Tauri MCP), debug builds only, localhost only.
    #[cfg(debug_assertions)]
    let app = app.plugin(tauri_plugin_mcp_bridge::Builder::new().bind_address("127.0.0.1").build());

    app.invoke_handler(builder.invoke_handler())
        .setup(move |app| {
            builder.mount_events(app);
            let state = AppState::new(app.handle().clone())?;
            let windows = WindowsState::default();
            if let Ok(cwd) = std::env::current_dir()
                && let Some(path) = windows::cli_path(&std::env::args().collect::<Vec<_>>(), &cwd)
            {
                windows.set_launch("main", windows::Launch { project: Some(path.into()), ..Default::default() });
            }
            let menu_state = menu::MenuState::default();
            menu::install(app.handle(), &menu_state, &state.recent.list());
            app.manage(state);
            app.manage(windows);
            app.manage(menu_state);
            app.on_menu_event(on_menu_event);
            windows::create_main_window(app.handle())?;
            Ok(())
        })
        .on_window_event(|window, event| match event {
            tauri::WindowEvent::Focused(true) => {
                if let Some(w) = window.try_state::<WindowsState>() {
                    w.focused(window.label());
                }
            }
            tauri::WindowEvent::Destroyed => {
                if let Some(settings) = window.app_handle().get_webview_window(&windows::settings_label(window.label()))
                {
                    let _ = settings.destroy();
                }
                if let Some(state) = window.try_state::<AppState>() {
                    state.close_project(window.label());
                }
                if let Some(w) = window.try_state::<WindowsState>() {
                    w.forget(window.label());
                }
            }
            _ => {}
        })
        .build(context)
        .expect("error while running OpenIDEA")
        .run(|app, event| {
            // Quit after installing an update (`app_install_update`): relaunch.
            if let tauri::RunEvent::Exit = event
                && app.try_state::<WindowsState>().is_some_and(|w| w.restart_requested())
            {
                tauri::process::restart(&app.env());
            }
        });
}

fn window_state_flags() -> tauri_plugin_window_state::StateFlags {
    use tauri_plugin_window_state::StateFlags;
    StateFlags::SIZE | StateFlags::POSITION | StateFlags::MAXIMIZED | StateFlags::FULLSCREEN
}

/// Routes IDE menu items to the focused window's frontend (`executeAction`).
fn on_menu_event(app: &tauri::AppHandle, event: tauri::menu::MenuEvent) {
    let id = event.id().as_ref();
    let Some(route) = menu::route(&menu::spec(menu::Os::current()), id) else { return };
    match windows::target_window(app) {
        Some(w) => {
            // Settings is modal for its project window: only app-level items get through, to the parent.
            let label = match windows::settings_parent(w.label()) {
                Some(parent)
                    if matches!(route.action.as_str(), "app.quit" | "file.settings" | "file.newProjectsSettings") =>
                {
                    parent
                }
                Some(_) => return,
                None => w.label(),
            };
            if let Err(e) = app.emit_to(label, menu::MENU_EVENT, &route) {
                tracing::warn!("failed to deliver menu event {id}: {e}");
            }
        }
        // No window left (macOS keeps the menu bar): handle the few that make sense.
        None => match route.action.as_str() {
            "app.quit" => app.exit(0),
            "window.new" | "file.openProject" => windows::spawn_window(app, None),
            menu::OPEN_RECENT_ACTION => windows::spawn_window(app, route.arg.map(Into::into)),
            _ => {}
        },
    }
}