import Cocoa

/// 菜单栏控制器：管理状态栏图标和菜单
final class MenuBarController: NSObject {

    private let statusItem: NSStatusItem
    private let menu = NSMenu()
    private var languageMenuItems: [NSMenuItem] = []

    // 子菜单引用
    private let llmSubmenu = NSMenu()
    private let llmEnabledItem: NSMenuItem
    private let settingsWindow = SettingsWindow()

    override init() {
        statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)

        // LLM 启用/禁用
        llmEnabledItem = NSMenuItem(
            title: "Enable LLM Refinement",
            action: #selector(toggleLLM),
            keyEquivalent: ""
        )

        super.init()

        configureStatusItem()
        buildMenu()
    }

    private func configureStatusItem() {
        if let button = statusItem.button {
            button.image = NSImage(
                systemSymbolName: "mic.fill",
                accessibilityDescription: "Voice Input"
            )
            button.toolTip = "Voice Input — 按住 Fn 键录音"
        }
    }

    private func buildMenu() {
        // 当前语言显示
        let currentLanguageItem = NSMenuItem(
            title: "Language: \(Config.shared.language.displayName)",
            action: nil,
            keyEquivalent: ""
        )
        currentLanguageItem.isEnabled = false
        menu.addItem(currentLanguageItem)
        menu.addItem(.separator())

        // 语言选择子菜单
        let languageMenu = NSMenu()
        for lang in RecognitionLanguage.allCases {
            let item = NSMenuItem(
                title: lang.displayName,
                action: #selector(selectLanguage(_:)),
                keyEquivalent: ""
            )
            item.representedObject = lang
            item.state = lang == Config.shared.language ? .on : .off
            languageMenu.addItem(item)
            languageMenuItems.append(item)
        }

        let languageSubmenuItem = NSMenuItem()
        languageSubmenuItem.title = "Language"
        languageSubmenuItem.submenu = languageMenu
        menu.addItem(languageSubmenuItem)

        menu.addItem(.separator())

        // LLM 子菜单
        llmSubmenu.addItem(llmEnabledItem)
        llmEnabledItem.target = self
        llmEnabledItem.action = #selector(toggleLLM)
        updateLLMMenuState()

        let settingsItem = NSMenuItem(
            title: "LLM Settings...",
            action: #selector(openSettings),
            keyEquivalent: ","
        )
        settingsItem.target = self
        llmSubmenu.addItem(settingsItem)

        let llmSubmenuItem = NSMenuItem()
        llmSubmenuItem.title = "LLM Refinement"
        llmSubmenuItem.submenu = llmSubmenu
        menu.addItem(llmSubmenuItem)

        menu.addItem(.separator())

        // 退出
        let quitItem = NSMenuItem(
            title: "Quit",
            action: #selector(quit),
            keyEquivalent: "q"
        )
        quitItem.target = self
        menu.addItem(quitItem)

        statusItem.menu = menu
    }

    private func updateLLMMenuState() {
        llmEnabledItem.state = Config.shared.llmEnabled ? .on : .off
    }

    private func updateLanguageMenuState() {
        for item in languageMenuItems {
            guard let lang = item.representedObject as? RecognitionLanguage else { continue }
            item.state = lang == Config.shared.language ? .on : .off
        }
        // 更新第一项的显示
        if let first = menu.items.first {
            first.title = "Language: \(Config.shared.language.displayName)"
        }
    }

    @objc private func selectLanguage(_ sender: NSMenuItem) {
        guard let lang = sender.representedObject as? RecognitionLanguage else { return }
        Config.shared.language = lang
        updateLanguageMenuState()
        print("[Menu] Language switched to: \(lang.displayName)")
    }

    @objc private func toggleLLM() {
        Config.shared.llmEnabled.toggle()
        updateLLMMenuState()
        print("[Menu] LLM Refinement: \(Config.shared.llmEnabled ? "ON" : "OFF")")
    }

    @objc private func openSettings() {
        settingsWindow.makeKeyAndOrderFront(nil)
        NSApp.activate(ignoringOtherApps: true)
    }

    @objc private func quit() {
        NSApp.terminate(nil)
    }
}