import Cocoa

/// 应用主控制器，协调按键监听、语音识别、LLM 纠错和文本注入
final class AppDelegate: NSObject, NSApplicationDelegate {

    private let keyMonitor = KeyMonitor()
    private let speechRecognizer = SpeechRecognizer()
    private let audioMonitor = AudioLevelMonitor()
    private let recordingPanel = RecordingPanel()
    private let menuBarController = MenuBarController()
    private let llmRefiner = LLMRefiner()

    private var isRecording = false
    private var finalTranscription: String = ""

    func applicationDidFinishLaunching(_ notification: Notification) {
        NSApp.setActivationPolicy(.accessory)

        // 启动按键监听
        let started = keyMonitor.start()
        if !started {
            showPermissionAlert()
        }

        keyMonitor.onFnDown = { [weak self] in
            self?.startRecording()
        }

        keyMonitor.onFnUp = { [weak self] in
            self?.stopRecording()
        }

        print("[App] Ready")
    }

    // MARK: - Recording

    private func startRecording() {
        guard !isRecording else { return }
        isRecording = true
        finalTranscription = ""

        recordingPanel.showAnimated()
        recordingPanel.updateText("Listening...")

        let language = Config.shared.language.rawValue

        Task { @MainActor in
            // 启动音频电平监测
            let audioOK = audioMonitor.start()
            if audioOK {
                audioMonitor.onLevelUpdate = { [weak self] level in
                    self?.recordingPanel.waveformView.updateLevel(level)
                }
            }

            // 启动语音识别
            let speechOK = await speechRecognizer.start(language: language)
            if !speechOK {
                recordingPanel.updateText("Recognition error")
                DispatchQueue.main.asyncAfter(deadline: .now() + 1.5) { [weak self] in
                    self?.cancelRecording()
                }
                return
            }

            speechRecognizer.onResult = { [weak self] text in
                guard let self = self, self.isRecording else { return }
                self.finalTranscription = text
                self.recordingPanel.updateText(text)
            }

            speechRecognizer.onError = { [weak self] error in
                print("[App] Speech error: \(error)")
                self?.recordingPanel.updateText("Error: \(error.localizedDescription)")
            }

            speechRecognizer.onStateChange = { [weak self] isActive in
                if !isActive, self?.isRecording == true {
                    // 识别意外停止
                }
            }
        }
    }

    private func stopRecording() {
        guard isRecording else { return }
        isRecording = false

        // 停止音频和识别
        audioMonitor.stop()
        _ = speechRecognizer.stop()

        let text = finalTranscription.trimmingCharacters(in: .whitespacesAndNewlines)

        // 如果 LLM 启用且已配置
        if Config.shared.llmEnabled && Config.shared.isLLMConfigured && !text.isEmpty {
            recordingPanel.showRefining()

            Task { @MainActor in
                do {
                    let result = try await llmRefiner.refine(text: text, config: Config.shared)
                    recordingPanel.hideAnimated {
                        TextInjector.inject(result.refinedText)
                    }
                } catch {
                    print("[App] LLM error: \(error)")
                    // LLM 失败，回退到原始文本
                    recordingPanel.hideAnimated {
                        TextInjector.inject(text)
                    }
                }
            }
        } else if !text.isEmpty {
            recordingPanel.hideAnimated {
                TextInjector.inject(text)
            }
        } else {
            recordingPanel.hideAnimated()
        }

        finalTranscription = ""
    }

    private func cancelRecording() {
        audioMonitor.stop()
        speechRecognizer.cancel()
        recordingPanel.hideAnimated()
        isRecording = false
        finalTranscription = ""
    }

    // MARK: - Permissions

    private func showPermissionAlert() {
        let alert = NSAlert()
        alert.messageText = "Accessibility Permission Required"
        alert.informativeText = """
        Voice Input needs Accessibility permission to detect the Fn key globally.

        Please go to System Settings > Privacy & Security > Accessibility
        and enable Voice Input.
        """
        alert.alertStyle = .warning
        alert.addButton(withTitle: "Open System Settings")
        alert.addButton(withTitle: "Later")

        if alert.runModal() == .alertFirstButtonReturn {
            NSWorkspace.shared.open(URL(string: "x-apple.systempreferences:com.apple.preference.security?Privacy_Accessibility")!)
        }
    }

    func applicationWillTerminate(_ notification: Notification) {
        keyMonitor.stop()
        audioMonitor.stop()
        speechRecognizer.cancel()
        recordingPanel.close()
    }
}