//! 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 application_focus;
mod commands;
#[cfg(debug_assertions)]
mod dev;
mod events;
#[cfg(any(target_os = "linux", test))]
mod linux_window_state;
mod logging;
#[cfg(target_os = "macos")]
mod macos;
mod menu;
mod plugin_web;
mod remote_dev;

mod state;
mod theme_frame;
#[cfg(target_os = "macos")]
mod titlebar;
mod window_groups;
#[cfg(any(windows, test))]
mod window_work_area;
mod windows;

use parking_lot::Mutex;
use state::AppState;
use std::path::PathBuf;
use std::sync::Arc;
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!();
    #[cfg(debug_assertions)]
    let context = dev::configure(context);
    logging::init(&context.config().identifier);

    let refresh_shell_path = ide_host::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_local_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)));
        ide_sdk::java::add_jdk_root(&ide_tools::jdk::jdks_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.
    // Debug builds have a separate identifier per worktree.
    let app = app.plugin(tauri_plugin_single_instance::init(windows::on_second_instance));
    // Install before window-state restores maximized geometry during window creation.
    #[cfg(windows)]
    let app = app.plugin(window_work_area::init());
    let app = app.plugin(tauri_plugin_opener::init()).plugin(tauri_plugin_dialog::init());
    #[cfg(target_os = "linux")]
    let app = app.plugin(linux_window_state::plugin());
    #[cfg(not(target_os = "linux"))]
    let app = app.plugin(
        tauri_plugin_window_state::Builder::default()
            .with_state_flags(window_state_flags())
            // One remembered geometry per kind of auxiliary window (all projects' settings windows share one).
            .map_label(windows::state_key)
            .build(),
    );
    let app = app
        // Inert until an endpoint is configured (see `commands::window::app_check_update`).
        .plugin(tauri_plugin_updater::Builder::new().build());
    // Files of plugins' web views, for their sandboxed frames.
    let app = app.register_asynchronous_uri_scheme_protocol(plugin_web::SCHEME, plugin_web::handle);
    // 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());

    // Paths macOS asked to open (Finder's Open With, the Dock) before setup ran: the first window takes them.
    let early_opens: Arc<Mutex<Option<Vec<PathBuf>>>> = Arc::default();
    let setup_opens = early_opens.clone();
    let typed_invoke = builder.invoke_handler();
    // Raw Response is not a JSON/Specta type; keep the binary command out of generated bindings.
    let raw_invoke: fn(tauri::ipc::Invoke) -> bool = tauri::generate_handler![commands::fonts::user_font_data];
    let invoke = Arc::new(move |request: tauri::ipc::Invoke| {
        if request.message.command() == "user_font_data" { raw_invoke(request) } else { typed_invoke(request) }
    });
    app.invoke_handler(move |request| {
        let webview = request.message.webview_ref();
        if let Some(state) = webview.try_state::<AppState>() {
            let label = AppState::owner_window(webview.label());
            if let Some(connection) = state.remote_dev.get(label) {
                let label = label.to_owned();
                let command = request.message.command().to_owned();
                let invoke = invoke.clone();
                let app = webview.app_handle().clone();
                tauri::async_runtime::spawn(async move {
                    match connection.authorize_command(&label, &command).await {
                        Ok(()) => {
                            let resolver = request.resolver.clone();
                            // Sync commands must run on the main thread, as they do in local windows.
                            if let Err(error) = app.run_on_main_thread(move || {
                                invoke(request);
                            }) {
                                resolver.reject(ide_core::IdeError::internal(format!(
                                    "failed to dispatch command on the main thread: {error}"
                                )));
                            }
                        }
                        Err(error) => request.resolver.reject(error),
                    }
                });
                return true;
            }
            if let Err(error) = state.host.authorize_command(webview.label(), request.message.command()) {
                request.resolver.reject(error);
                return true;
            }
        }
        invoke(request)
    })
    .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::remember_cli_position(&windows, &std::env::args().collect::<Vec<_>>(), &path);
            windows.set_launch("main", windows::path_launch(path));
        }
        let menu_state = menu::MenuState::default();
        menu::install(app.handle(), &menu_state, &state.recent.list());
        app.manage(state);
        app.manage(windows);
        app.manage(application_focus::ApplicationFocus::default());
        #[cfg(target_os = "macos")]
        application_focus::observe(app.handle());
        app.manage(menu_state);
        if let Some(paths) = setup_opens.lock().take() {
            windows::open_paths_at_launch(app.handle(), paths);
        }
        app.on_menu_event(on_menu_event);
        windows::create_main_window(app.handle())?;
        Ok(())
    })
    .on_window_event(|window, event| match event {
        #[cfg(target_os = "linux")]
        tauri::WindowEvent::CloseRequested { .. } => linux_window_state::save_before_close(window.app_handle()),
        tauri::WindowEvent::Focused(true) => {
            application_focus::changed(window.app_handle(), true);
            if let Some(w) = window.try_state::<WindowsState>() {
                w.focused(window.label());
            }
        }
        tauri::WindowEvent::Focused(false) => application_focus::changed(window.app_handle(), false),
        tauri::WindowEvent::Destroyed => {
            #[cfg(target_os = "macos")]
            {
                titlebar::forget(window);
                macos::forget_fullscreen(window.label());
            }
            if windows::auxiliary_parent(window.label()).is_none() {
                window_groups::destroyed(window.app_handle(), window.label());
                windows::close_auxiliary_windows(window.app_handle(), window.label());
                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());
            }
            if windows::auxiliary_parent(window.label()).is_none() {
                windows::continue_quit(window.app_handle(), Some(window.label()));
            }
        }
        _ => {}
    })
    .build(context)
    .expect("error while running OpenIDEA")
    .run(move |app, event| {
        #[cfg(target_os = "macos")]
        if let tauri::RunEvent::Opened { urls } = &event {
            let paths = windows::opened_paths(urls);
            if app.try_state::<WindowsState>().is_some() {
                windows::open_paths(app, paths);
            } else {
                early_opens.lock().get_or_insert_default().extend(paths);
            }
        }
        #[cfg(not(target_os = "macos"))]
        let _ = &early_opens;
        if let tauri::RunEvent::Exit = event {
            if let Some(state) = app.try_state::<AppState>() {
                state.host.clear_workspace_edit_history_on_exit();
                state.host.shutdown_notebooks_on_exit();
            }
            // Cleanup must finish before update/restart replaces this process.
            if app.try_state::<WindowsState>().is_some_and(|w| w.restart_requested()) {
                tauri::process::restart(&app.env());
            }
        }
    });
}

#[cfg(not(target_os = "linux"))]
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) => {
            // App-level items of an auxiliary window go to its project window. Settings is modal for it:
            // nothing else gets through. Others handle their own items; Close Tab closes the window.
            let label = match windows::auxiliary(w.label()) {
                Some((_, parent))
                    if matches!(route.action.as_str(), "app.quit" | "file.settings" | "file.newProjectsSettings") =>
                {
                    parent
                }
                Some((kind, _)) if kind.modal() => return,
                Some(_) if route.action == "editor.closeTab" => {
                    let _ = w.close();
                    return;
                }
                _ => 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)),
            _ => {}
        },
    }
}