import Cocoa
import AVFoundation
import ApplicationServices

public final class AppDelegate: NSObject, NSApplicationDelegate {
    private var statusBarController: StatusBarController!
    private var audioRecorder = AudioRecorder()
    private var activeSession: SonioxLiveSession?
    private var isBusyFinalizing = false
    private var currentAudioLevel: Float = 0.0
    private var latestPartialText: String? = nil
    private var pendingStopWorkItem: DispatchWorkItem? = nil
    private var isNetworkDegraded: Bool = false
    private var lastRecordedAudio: Data = Data()
    
    public func applicationDidFinishLaunching(_ notification: Notification) {
        if UserDefaults.standard.object(forKey: "SonioxPlaySounds") == nil {
            UserDefaults.standard.set(true, forKey: "SonioxPlaySounds")
        }
        
        statusBarController = StatusBarController()
        statusBarController.onToggleRecording = { [weak self] in
            self?.toggleRecording()
        }
        
        // Setup Hotkey manager callbacks (Push-To-Talk & Toggle)
        HotkeyManager.shared.onHotkeyPressed = { [weak self] in
            guard let self = self else { return }
            self.pendingStopWorkItem?.cancel()
            self.pendingStopWorkItem = nil
            if HotkeyManager.shared.currentMode == .pushToTalk {
                if !self.audioRecorder.isRecording {
                    self.startRecording()
                }
            } else {
                self.toggleRecording()
            }
        }
        
        HotkeyManager.shared.onHotkeyReleased = { [weak self] in
            guard let self = self else { return }
            if HotkeyManager.shared.currentMode == .pushToTalk {
                if self.audioRecorder.isRecording {
                    self.pendingStopWorkItem?.cancel()
                    let workItem = DispatchWorkItem { [weak self] in
                        guard let self = self else { return }
                        if self.audioRecorder.isRecording {
                            self.stopRecording()
                        }
                    }
                    self.pendingStopWorkItem = workItem
                    // Trailing grace period: 0.5s (500ms) buffer so trailing words/syllables are never clipped
                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.50, execute: workItem)
                }
            }
        }
        
        HotkeyManager.shared.registerHotkeys()
        
        // Listen to live audio levels & update HUD
        audioRecorder.onAudioLevelUpdate = { [weak self] level in
            guard let self = self else { return }
            self.currentAudioLevel = level
            if self.audioRecorder.isRecording {
                HUDOverlayController.shared.show(state: .recording(level: level, liveText: self.latestPartialText, isLagging: self.isNetworkDegraded))
            }
        }
        
        // Stream audio chunk live directly to active Soniox session in real-time
        audioRecorder.onAudioChunkAvailable = { [weak self] chunk in
            self?.activeSession?.sendAudioChunk(chunk)
        }
        
        // Pre-warm the background WebSocket session for 0ms startup delay
        SonioxSessionPool.shared.prewarmNextSession()
        
        // Check permissions on start
        checkInitialPermissions()
    }
    
    private func checkInitialPermissions() {
        // 1. Microphone
        audioRecorder.requestMicrophonePermission { granted in
            if !granted {
                print("Microphone permission not granted yet.")
            }
        }
        
        // 2. Accessibility
        if !AXIsProcessTrusted() {
            let options = [kAXTrustedCheckOptionPrompt.takeUnretainedValue() as String: true] as CFDictionary
            AXIsProcessTrustedWithOptions(options)
        }
    }
    
    private func playSystemSound(name: String) {
        if SonioxSettings.shared.playSounds {
            NSSound(named: NSSound.Name(name))?.play()
        }
    }
    
    public func toggleRecording() {
        if audioRecorder.isRecording {
            stopRecording()
        } else {
            startRecording()
        }
    }
    
    public func startRecording() {
        if audioRecorder.isRecording || isBusyFinalizing { return }
        
        latestPartialText = nil
        isNetworkDegraded = false
        lastRecordedAudio.removeAll()
        
        // 1. Find or focus an input box in the active window before user starts speaking
        InputBoxManager.shared.ensureFocusedInputBox()
        
        // 2. Acquire pre-warmed / fast-connected WebSocket session
        let session = SonioxSessionPool.shared.acquireSession()
        self.activeSession = session
        
        // Handle network degradation / packet loss warning
        session.onNetworkDegraded = { [weak self] degraded in
            guard let self = self else { return }
            self.isNetworkDegraded = degraded
            if self.audioRecorder.isRecording {
                HUDOverlayController.shared.show(state: .recording(level: self.currentAudioLevel, liveText: self.latestPartialText, isLagging: degraded))
            }
        }
        
        // Handle streaming delta text (incremental committed words)
        session.onCommittedDelta = { [weak self] delta in
            guard let self = self else { return }
            // If it's an executive slash command, do NOT type it into the input box
            if SonioxSettings.shared.voiceCommands && VoiceCommandExecutor.shared.isSlashCommand(text: delta) {
                return
            }
            InputBoxManager.shared.streamDelta(text: delta)
        }
        
        session.onPartialText = { [weak self] partial in
            guard let self = self else { return }
            self.latestPartialText = partial
            if self.audioRecorder.isRecording {
                HUDOverlayController.shared.show(state: .recording(level: self.currentAudioLevel, liveText: partial, isLagging: self.isNetworkDegraded))
            }
        }
        
        session.onFinalResult = { [weak self] result in
            DispatchQueue.main.async {
                guard let self = self else { return }
                self.handleFinalResult(result)
            }
        }
        
        do {
            try audioRecorder.startRecording()
            playSystemSound(name: "Tink")
            statusBarController.updateIcon(state: .recording)
            statusBarController.buildMenu(isRecording: true)
            HUDOverlayController.shared.show(state: .recording(level: 0.1, liveText: nil, isLagging: false))
        } catch {
            print("Failed to start audio recording:", error)
            activeSession?.cancel()
            activeSession = nil
            HUDOverlayController.shared.show(state: .error(message: "عدم دسترسی به میکروفون"))
        }
    }
    
    public func stopRecording() {
        guard audioRecorder.isRecording else { return }
        
        let pcmData = audioRecorder.stopRecording()
        self.lastRecordedAudio = pcmData
        
        playSystemSound(name: "Pop")
        statusBarController.updateIcon(state: .transcribing)
        statusBarController.buildMenu(isRecording: false)
        HUDOverlayController.shared.show(state: .transcribing)
        
        isBusyFinalizing = true
        
        // Safety timeout watchdog: finalize must complete within 4.0s
        DispatchQueue.main.asyncAfter(deadline: .now() + 4.0) { [weak self] in
            guard let self = self, self.isBusyFinalizing else { return }
            print("AppDelegate: Finalize safety watchdog triggered — recovering transcript.")
            self.activeSession?.completeWithCurrentText()
        }
        
        activeSession?.finalizeStream()
    }
    
    private func handleFinalResult(_ result: Result<String, Error>) {
        self.activeSession = nil
        self.statusBarController.updateIcon(state: .idle)
        
        var rawText = ""
        switch result {
        case .success(let text):
            rawText = text.trimmingCharacters(in: .whitespacesAndNewlines)
        case .failure(let error):
            print("Soniox primary finalize error:", error)
        }
        
        // Check if smart audio recovery is needed:
        // If text is empty or we experienced network failure, and we captured substantial audio (> 0.8s)
        let needsRetry = (rawText.isEmpty || self.isNetworkDegraded) && self.lastRecordedAudio.count > 25600
        
        if needsRetry {
            print("AppDelegate: Network drop or truncated output detected. Triggering Smart Audio Recovery with \(self.lastRecordedAudio.count) bytes...")
            HUDOverlayController.shared.show(state: .retrying(message: "اینترنت ضعیف... در حال بازیابی صوت"))
            
            let audioCopy = self.lastRecordedAudio
            let hints = SonioxSettings.shared.language.hints
            
            SonioxLiveSession.retryFullBufferedAudio(pcmData: audioCopy, languageHints: hints, onProgress: { progress in
                HUDOverlayController.shared.show(state: .recording(level: 0.2, liveText: progress, isLagging: true))
            }) { [weak self] retryResult in
                guard let self = self else { return }
                self.isBusyFinalizing = false
                
                switch retryResult {
                case .success(let recoveredText):
                    let trimmed = recoveredText.trimmingCharacters(in: .whitespacesAndNewlines)
                    let finalText = trimmed.isEmpty ? rawText : trimmed
                    self.deliverOutputText(finalText)
                case .failure:
                    self.deliverOutputText(rawText)
                }
            }
            return
        }
        
        self.isBusyFinalizing = false
        deliverOutputText(rawText)
    }
    
    private func deliverOutputText(_ text: String) {
        guard !text.isEmpty else {
            HUDOverlayController.shared.hide()
            return
        }
        
        // 1. Check for Executive Voice Slash Commands
        if SonioxSettings.shared.voiceCommands && VoiceCommandExecutor.shared.isSlashCommand(text: text) {
            HUDOverlayController.shared.show(state: .success(text: "دستور صوتی"))
            VoiceCommandExecutor.shared.execute(rawText: text)
            return // STRICT: Slash commands are executed, never pasted!
        }
        
        // 2. Normal dictation processing & paste
        let processed = TextProcessor.shared.process(text: text)
        if !processed.isEmpty {
            VoiceCommandLogger.shared.logDictation(rawSpeech: text, processed: processed)
            HistoryManager.shared.addEntry(processed)
            InputBoxManager.shared.commitFinalText(processedText: processed, addTrailingSpace: SonioxSettings.shared.addTrailingSpace)
            HUDOverlayController.shared.show(state: .success(text: processed))
        } else {
            HUDOverlayController.shared.hide()
        }
    }
    
    public func applicationWillTerminate(_ notification: Notification) {
        HotkeyManager.shared.unregisterHotkeys()
    }
}