import UIKit
import Flutter
import AVFoundation

@main
@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    // Configure the iOS AVAudioSession for voice chat BEFORE Flutter
    // starts the audio engine. The category + mode combination tells
    // iOS to:
    //   * route via the receiver/speaker like a phone call
    //     (`.playAndRecord` + `.voiceChat`)
    //   * engage hardware AEC / NS where the device supports it
    //   * default the speaker output (so the user doesn't have to
    //     hold the phone to their ear)
    //   * permit Bluetooth headsets (so AirPods et al. just work)
    //
    // SRS-197 covers the iOS audio routing contract; this is the
    // matching iOS-side implementation. Failures are logged but do
    // not block app launch — the audio engine will still come up,
    // just at the iOS default playback route.
    do {
      let session = AVAudioSession.sharedInstance()
      try session.setCategory(
        .playAndRecord,
        mode: .voiceChat,
        options: [.defaultToSpeaker, .allowBluetooth, .allowBluetoothA2DP]
      )
      try session.setActive(true, options: [])
      NSLog("chanora_flutter: AVAudioSession configured (playAndRecord/voiceChat)")
    } catch {
      NSLog("chanora_flutter: AVAudioSession setup failed: \(error)")
    }

    // Request microphone access on first launch rather than waiting
    // for the user's first voice-channel join. The latter is
    // surprising: the user has only tapped "connect to server" and
    // suddenly iOS pops the permission prompt because joining a
    // text channel happens to trigger audio engine startup. Asking
    // up-front matches user expectations for a voice-chat client.
    //
    // The request is asynchronous and non-blocking. If the user
    // denies, voice_join will surface a clearer error later when
    // the audio engine fails to open the input device. The
    // permission state is cached by iOS so subsequent launches
    // skip the prompt.
    //
    // Deferred ~1 s so iOS finishes initialising the keyboard /
    // text-input subsystem before the permission alert appears.
    // Firing the alert too early steals focus from the not-yet-
    // ready text-input layer, with the symptom that the first tap
    // on a TextField does nothing (the second tap works because
    // by then iOS has caught up). DispatchQueue.main.asyncAfter
    // keeps everything on the main thread; the permission API
    // itself must be called there too.
    DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
      AVAudioSession.sharedInstance().requestRecordPermission { granted in
        NSLog("chanora_flutter: microphone permission granted=\(granted)")
      }
    }

    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
  }
}