import AppKit

// AppDelegate is the app "traffic controller".
// It wires up:
// - the status bar overlay window (Status Bar mode)
// - the regular main window (Application Window mode)
// - the global hotkey Cmd+Opt+Shift+P to toggle modes
// - the top application menu (Prole → Show/Hide, Refresh, Quit)
//
// Tip for learners:
// In macOS apps, NSApplication + NSApp.run() starts the event loop.
// AppDelegate receives lifecycle callbacks like applicationDidFinishLaunching.

final class AppDelegate: NSObject, NSApplicationDelegate {
    private var overlayWindowController: OverlayWindowController!
    private var mainWindowController: MainWindowController!
    private var dbStatusWindowController: DBStatusWindowController!
    private var ircWindowController: IRCWindowController!
    private var hotKeyManager: HotKeyManager!
    private var serviceChecker: ServiceChecker!
    private var statusItemController: StatusItemController!
    // Splash screen removed — keep no reference
    private var appMenuToggleStatusBarItem: NSMenuItem?
    // Port-forwarding is now managed by a user LaunchAgent. Keep a small helper.
    private let launchAgentManager = LaunchAgentManager()
    private var preferencesWindowController: PreferencesWindowController?

    // We keep the app in one of two simple modes.
    // - statusBar: shows the thin overlay near the macOS menu bar
    // - appWindow: shows the regular resizable window
    private enum Mode { case statusBar, appWindow }
    private var mode: Mode = .appWindow

    func applicationDidFinishLaunching(_ notification: Notification) {
        dlog("applicationDidFinishLaunching")
        // Bootstrap PROLE_HOME directories and config/log files
        ProleEnv.bootstrap()
        Logger.shared.info("Prole Tools starting up")
        // We'll start in Application Window mode and use regular activation policy
        // .regular = normal app with menu bar and windows
        // .accessory = utility app without a Dock icon/menu bar (good for status‑bar utilities)
        NSApp.setActivationPolicy(.regular)
        dlog("Activation policy set to .regular (starting in App Window mode)")

        // Splash removed: start directly

        // No more helper script bundling. All shell commands go via $PROLE_HOME/env.sh.

        // ServiceChecker does the lightweight TCP checks on a background timer
        serviceChecker = ServiceChecker()
        dlog("ServiceChecker created")
        // Note: In-app port-forward supervision has been removed.
        // Port-forwards are handled by LaunchAgents. Nothing to start here.

        // Overlay (Status Bar mode) — a thin, mostly click‑through window near the top
        overlayWindowController = OverlayWindowController(serviceChecker: serviceChecker, pfManager: nil)
        dlog("OverlayWindowController created; computing initial frame/visibility")
        overlayWindowController.showIfMenuBarVisible()

        // Main window (Application Window mode) — vertical, simple status view
        mainWindowController = MainWindowController(serviceChecker: serviceChecker, actions: .init(
            onRefresh: { [weak self] in self?.refreshNow() },
            onMinimizeToStatusBar: { [weak self] in self?.switchToStatusBarMode() }
        ), pfManager: nil)
        dlog("MainWindowController created")

        // Database status window — positioned slightly down and left of main window
        dbStatusWindowController = DBStatusWindowController(actions: .init(
            onMinimizeToStatusBar: { [weak self] in self?.switchToStatusBarMode() }
        ))
        dlog("DBStatusWindowController created")

        // IRC window — short vertically, long horizontally, positioned below Prole Status
        ircWindowController = IRCWindowController()
        dlog("IRCWindowController created")

        // Create status bar item with icon and click handler
        // Status bar item with a monospaced "P" and its own right‑click menu
        statusItemController = StatusItemController(actions: .init(
            onLeftClick: { [weak self] in
                guard let self = self else { return }
                switch self.mode {
                case .statusBar: self.overlayWindowController.showOverlayNow()
                case .appWindow: self.mainWindowController.show()
                }
            },
            onToggleStatusBar: { [weak self] in self?.toggleStatusBarVisibility() },
            onToggleAppWindow: { [weak self] in self?.toggleAppWindowVisibility() },
            onRefresh: { [weak self] in self?.refreshNow() },
            onQuit: { NSApp.terminate(nil) }
        ))
        dlog("Status bar item created")

        // Register the global hotkey: Cmd+Opt+Shift+P → toggle modes
        hotKeyManager = HotKeyManager()
        hotKeyManager.registerGlobalHotKey(modifiers: [.command, .option, .shift], key: .p) { [weak self] in
            self?.toggleMode()
        }
        dlog("Global hotkey registered (Cmd+Opt+Shift+P) — toggle modes")

        // Observe screen/space/menu bar visibility changes
        // (So the overlay can reposition itself correctly.)
        DistributedNotificationCenter.default().addObserver(self, selector: #selector(handleConfigChange), name: NSNotification.Name("com.apple.HIToolbox.inputSourceChanged"), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(handleConfigChange), name: NSApplication.didChangeScreenParametersNotification, object: nil)
        NSWorkspace.shared.notificationCenter.addObserver(self, selector: #selector(spaceChanged), name: NSWorkspace.activeSpaceDidChangeNotification, object: nil)
        // Observe request to show main window from overlay maximize button
        NotificationCenter.default.addObserver(self, selector: #selector(showMainWindowRequested), name: .showMainWindow, object: nil)
        // Observe toggle mode request (simulate Cmd+Opt+Shift+P)
        NotificationCenter.default.addObserver(self, selector: #selector(menuToggleMode), name: .toggleMode, object: nil)

        // Check status every 30 seconds
        // (Learner tweak: change this interval to refresh more/less often.)
        dlog("Starting ServiceChecker timer (interval: 30s)")
        serviceChecker.start(interval: 30)

        // No splash controller to release

        // Build application menu (shown when activation policy is .regular)
        setupApplicationMenu()

        // Observe config changes: refresh status on save
        NotificationCenter.default.addObserver(self, selector: #selector(menuRefresh), name: Config.didChangeNotification, object: nil)

        // Start in Application Window mode by default
        // Ensure main window is positioned at the left and visible immediately
        if let mainWin = mainWindowController.window { MainWindowController.positionWindowAtLeftEdge(mainWin) }
        switchToAppWindowMode()
        // Ensure menu reflects current visibility
        statusItemController.setState(statusBarVisible: statusItemController.isVisible, appWindowVisible: mainWindowController.isVisible)
        updateApplicationMenuTitles()
    }

    @objc private func handleConfigChange() {
        dlog("handleConfigChange → recomputeFrameAndVisibility")
        if mode == .statusBar { overlayWindowController.recomputeFrameAndVisibility() }
    }

    @objc private func spaceChanged() {
        dlog("spaceChanged → recomputeFrameAndVisibility")
        if mode == .statusBar { overlayWindowController.recomputeFrameAndVisibility() }
    }

    // MARK: - Mode and Actions
    private func toggleMode() {
        // Simple 2‑state switch
        switch mode {
        case .statusBar:
            switchToAppWindowMode()
        case .appWindow:
            switchToStatusBarMode()
        }
    }

    private func switchToStatusBarMode() {
        mode = .statusBar
        mainWindowController.hide()
        dbStatusWindowController.hide()
        ircWindowController.hide()
        overlayWindowController.showOverlayNow()
        NSApp.setActivationPolicy(.accessory)
        // Ensure the status bar icon is visible while in minimized scrolling status bar mode
        statusItemController.showStatusItem()
        statusItemController.setState(statusBarVisible: statusItemController.isVisible, appWindowVisible: false)
        dlog("Switched to Status Bar mode")
        updateApplicationMenuTitles()
    }

    private func switchToAppWindowMode() {
        mode = .appWindow
        overlayWindowController.hideOverlay()
        mainWindowController.show()
        // Position database status window slightly down and to the left of the main window
        if let ref = mainWindowController.window { dbStatusWindowController.position(relativeTo: ref) }
        dbStatusWindowController.show()
        // Position IRC window below the main window and show it
        if let ref = mainWindowController.window { ircWindowController.position(below: ref) }
        ircWindowController.show()
        NSApp.setActivationPolicy(.regular)
        // Hide the status bar icon while the main window UI is active (optional per requirements)
        statusItemController.hideStatusItem()
        statusItemController.setState(statusBarVisible: statusItemController.isVisible, appWindowVisible: true)
        dlog("Switched to Application Window mode")
        updateApplicationMenuTitles()
    }

    private func toggleStatusBarVisibility() {
        if statusItemController.isVisible {
            statusItemController.hideStatusItem()
        } else {
            statusItemController.showStatusItem()
        }
        statusItemController.setState(statusBarVisible: statusItemController.isVisible, appWindowVisible: (mode == .appWindow && mainWindowController.isVisible))
        updateApplicationMenuTitles()
    }

    private func toggleAppWindowVisibility() {
        if mainWindowController.isVisible {
            mainWindowController.hide()
            dbStatusWindowController.hide()
            ircWindowController.hide()
            if mode == .appWindow { mode = .statusBar }
        } else {
            mainWindowController.show()
            if let ref = mainWindowController.window {
                dbStatusWindowController.position(relativeTo: ref)
                ircWindowController.position(below: ref)
            }
            dbStatusWindowController.show()
            ircWindowController.show()
            mode = .appWindow
            overlayWindowController.hideOverlay()
        }
        statusItemController.setState(statusBarVisible: statusItemController.isVisible, appWindowVisible: mainWindowController.isVisible)
    }

    private func refreshNow() {
        // Broadcast a notification; ServiceChecker listens and forces a check.
        NotificationCenter.default.post(name: ServiceChecker.forceRefreshNotification, object: nil)
    }

    // MARK: - Application Menu
    private func setupApplicationMenu() {
        // Build a minimal menu programmatically to keep the project small
        let mainMenu = NSMenu(title: "MainMenu")
        let appMenuItem = NSMenuItem()
        mainMenu.addItem(appMenuItem)

        let appMenu = NSMenu(title: "Prole Tools")
        // Toggle between Application Window and Status Bar modes (same as Cmd+Opt+Shift+P)
        // Title updates dynamically via updateApplicationMenuTitles()
        let toggle = NSMenuItem(title: "Show Status Bar", action: #selector(menuToggleMode), keyEquivalent: "p")
        toggle.keyEquivalentModifierMask = [.command, .option, .shift]
        toggle.target = self
        appMenu.addItem(toggle)
        self.appMenuToggleStatusBarItem = toggle

        // Preferences…
        let prefs = NSMenuItem(title: "Preferences…", action: #selector(menuPreferences), keyEquivalent: ",")
        prefs.keyEquivalentModifierMask = [.command]
        prefs.target = self
        appMenu.addItem(prefs)

        appMenu.addItem(NSMenuItem.separator())

        // Restart Port Forwards (delegates to etc/init-port-fowards.sh)
        let resetPF = NSMenuItem(title: "Restart Port Forwards", action: #selector(menuResetPortForwards), keyEquivalent: "")
        resetPF.target = self
        appMenu.addItem(resetPF)
        appMenu.addItem(NSMenuItem.separator())

        // Refresh
        let refresh = NSMenuItem(title: "Refresh Now", action: #selector(menuRefresh), keyEquivalent: "r")
        refresh.target = self
        appMenu.addItem(refresh)

        appMenu.addItem(NSMenuItem.separator())

        // Quit
        let quit = NSMenuItem(title: "Quit Prole Tools", action: #selector(NSApp.terminate(_:)), keyEquivalent: "q")
        appMenu.addItem(quit)

        appMenuItem.submenu = appMenu

        // Add a standard Edit menu so Copy/Select All route to the first responder (e.g., our NSTextView)
        let editMenuItem = NSMenuItem()
        mainMenu.addItem(editMenuItem)
        let editMenu = NSMenu(title: "Edit")
        // Standard items; targets left nil so they go to first responder
        let copy = NSMenuItem(title: "Copy", action: #selector(NSText.copy(_:)), keyEquivalent: "c")
        copy.keyEquivalentModifierMask = [.command]
        editMenu.addItem(copy)
        let selectAll = NSMenuItem(title: "Select All", action: #selector(NSText.selectAll(_:)), keyEquivalent: "a")
        selectAll.keyEquivalentModifierMask = [.command]
        editMenu.addItem(selectAll)
        editMenuItem.submenu = editMenu

        NSApp.mainMenu = mainMenu
    }

    private func updateApplicationMenuTitles() {
        if let item = appMenuToggleStatusBarItem {
            // When we're showing the app window, offer to "Show Status Bar" (i.e., switch to status bar mode)
            // When we're in status bar mode, offer to "Show Main Window" (i.e., switch to app window mode)
            item.title = (mode == .appWindow) ? "Show Status Bar" : "Show Main Window"
        }
    }

    @objc private func menuToggleMode() { toggleMode() }
    @objc private func menuRefresh() { refreshNow() }
    @objc private func menuResetPortForwards() {
        // User-triggered restart remains available, but we do not auto-run it anywhere else.
        _ = PFScriptBridge.restart()
    }
    @objc private func menuPreferences() {
        if preferencesWindowController == nil {
            preferencesWindowController = PreferencesWindowController()
        }
        preferencesWindowController?.showWindow(nil)
        NSApp.activate(ignoringOtherApps: true)
    }

    // Invoked by overlay maximize button
    @objc private func showMainWindowRequested() {
        dlog("AppDelegate: showMainWindowRequested notification received")
        switchToAppWindowMode()
        // Maximize (zoom) the window to ensure it's fully visible/readable
        mainWindowController.window?.zoom(nil)
    }
}