import 'dart:async';
import 'dart:developer';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:test_sa/modules/cx_module/chat/call/call_error_handler.dart';

/// Production-ready permission helper for audio/video calls
/// Handles all permission requests with proper error handling and user feedback
class CallPermissionHelper {
  CallPermissionHelper._();

  /// Check and request microphone permission for audio calls
  /// Returns true if permission is granted, false otherwise
  static Future<bool> requestMicrophonePermission(BuildContext context) async {
    try {
      log('🎤 [PERMISSION] Checking microphone permission...', name: 'CallPermissionHelper');

      // Check current status
      final status = await Permission.microphone.status;
      log('   Current status: ${status.name}', name: 'CallPermissionHelper');

      if (status.isGranted) {
        log('✅ [PERMISSION] Microphone already granted', name: 'CallPermissionHelper');
        return true;
      }

      // If denied permanently, show settings dialog
      if (status.isPermanentlyDenied) {
        log('⚠️ [PERMISSION] Microphone permanently denied - showing settings dialog', name: 'CallPermissionHelper');
        if (context.mounted) {
          await _showPermissionDeniedDialog(
            context,
            'Microphone Permission Required',
            'This app needs microphone access to make calls. Please enable it in settings.',
            Permission.microphone,
          );
        }
        return false;
      }

      // Request permission
      log('📤 [PERMISSION] Requesting microphone permission...', name: 'CallPermissionHelper');
      final result = await Permission.microphone.request();
      log('   Result: ${result.name}', name: 'CallPermissionHelper');

      if (result.isGranted) {
        log('✅ [PERMISSION] Microphone permission granted', name: 'CallPermissionHelper');
        return true;
      }

      if (result.isPermanentlyDenied) {
        log('❌ [PERMISSION] Microphone permanently denied', name: 'CallPermissionHelper');
        if (context.mounted) {
          await _showPermissionDeniedDialog(
            context,
            'Microphone Permission Required',
            'This app needs microphone access to make calls. Please enable it in settings.',
            Permission.microphone,
          );
        }
        return false;
      }

      // User denied
      log('❌ [PERMISSION] Microphone permission denied by user', name: 'CallPermissionHelper');
      if (context.mounted) {
        CallErrorHandler.showMicrophonePermissionDenied(context);
      }
      return false;
    } catch (e, stackTrace) {
      log('❌ [PERMISSION] Error requesting microphone permission: $e\nStack: $stackTrace',
          name: 'CallPermissionHelper');
      if (context.mounted) {
        CallErrorHandler.showGenericError(context, 'Failed to request microphone permission');
      }
      return false;
    }
  }

  /// Check and request camera permission for video calls
  /// Returns true if permission is granted, false otherwise
  static Future<bool> requestCameraPermission(BuildContext context) async {
    try {
      log('📹 [PERMISSION] Checking camera permission...', name: 'CallPermissionHelper');

      // Check current status
      final status = await Permission.camera.status;
      log('   Current status: ${status.name}', name: 'CallPermissionHelper');

      if (status.isGranted) {
        log('✅ [PERMISSION] Camera already granted', name: 'CallPermissionHelper');
        return true;
      }

      // If denied permanently, show settings dialog
      if (status.isPermanentlyDenied) {
        log('⚠️ [PERMISSION] Camera permanently denied - showing settings dialog', name: 'CallPermissionHelper');
        if (context.mounted) {
          await _showPermissionDeniedDialog(
            context,
            'Camera Permission Required',
            'This app needs camera access for video calls. Please enable it in settings.',
            Permission.camera,
          );
        }
        return false;
      }

      // Request permission
      log('📤 [PERMISSION] Requesting camera permission...', name: 'CallPermissionHelper');
      final result = await Permission.camera.request();
      log('   Result: ${result.name}', name: 'CallPermissionHelper');

      if (result.isGranted) {
        log('✅ [PERMISSION] Camera permission granted', name: 'CallPermissionHelper');
        return true;
      }

      if (result.isPermanentlyDenied) {
        log('❌ [PERMISSION] Camera permanently denied', name: 'CallPermissionHelper');
        if (context.mounted) {
          await _showPermissionDeniedDialog(
            context,
            'Camera Permission Required',
            'This app needs camera access for video calls. Please enable it in settings.',
            Permission.camera,
          );
        }
        return false;
      }

      // User denied
      log('❌ [PERMISSION] Camera permission denied by user', name: 'CallPermissionHelper');
      if (context.mounted) {
        CallErrorHandler.showCameraPermissionDenied(context);
      }
      return false;
    } catch (e, stackTrace) {
      log('❌ [PERMISSION] Error requesting camera permission: $e\nStack: $stackTrace',
          name: 'CallPermissionHelper');
      if (context.mounted) {
        CallErrorHandler.showGenericError(context, 'Failed to request camera permission');
      }
      return false;
    }
  }

  /// Request all permissions required for audio calls (microphone only)
  /// Returns true if all permissions are granted, false otherwise
  static Future<bool> requestAudioCallPermissions(BuildContext context) async {
    log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
    log('🎵 [PERMISSION] Requesting audio call permissions...', name: 'CallPermissionHelper');

    final micGranted = await requestMicrophonePermission(context);

    if (!micGranted) {
      log('❌ [PERMISSION] Audio call permissions denied', name: 'CallPermissionHelper');
      log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
      return false;
    }

    log('✅ [PERMISSION] All audio call permissions granted', name: 'CallPermissionHelper');
    log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
    return true;
  }

  /// Request all permissions required for video calls (microphone + camera)
  /// Returns true if all permissions are granted, false otherwise
  static Future<bool> requestVideoCallPermissions(BuildContext context) async {
    log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
    log('📹 [PERMISSION] Requesting video call permissions...', name: 'CallPermissionHelper');

    // Request both permissions
    final micGranted = await requestMicrophonePermission(context);
    if (!micGranted) {
      log('❌ [PERMISSION] Video call permissions denied (microphone)', name: 'CallPermissionHelper');
      log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
      return false;
    }

    final cameraGranted = await requestCameraPermission(context);
    if (!cameraGranted) {
      log('❌ [PERMISSION] Video call permissions denied (camera)', name: 'CallPermissionHelper');
      log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
      return false;
    }

    log('✅ [PERMISSION] All video call permissions granted', name: 'CallPermissionHelper');
    log('═══════════════════════════════════════════', name: 'CallPermissionHelper');
    return true;
  }

  /// Check if microphone permission is granted (without requesting)
  static Future<bool> isMicrophoneGranted() async {
    final status = await Permission.microphone.status;
    return status.isGranted;
  }

  /// Check if camera permission is granted (without requesting)
  static Future<bool> isCameraGranted() async {
    final status = await Permission.camera.status;
    return status.isGranted;
  }

  /// Show dialog when permission is permanently denied, with option to open settings
  static Future<void> _showPermissionDeniedDialog(
    BuildContext context,
    String title,
    String message,
    Permission permission,
  ) async {
    if (!context.mounted) return;

    return showDialog(
      context: context,
      barrierDismissible: false,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text(title),
          content: Text(message),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(context).pop(),
              child: const Text('Cancel'),
            ),
            TextButton(
              onPressed: () async {
                Navigator.of(context).pop();
                await openAppSettings();
              },
              child: const Text('Open Settings'),
            ),
          ],
        );
      },
    );
  }

  /// Handle permission denial during an active call
  /// Shows error and optionally ends the call
  static Future<void> handlePermissionDeniedDuringCall(
    BuildContext context,
    String permissionName, {
    required Function() onEndCall,
    int delaySeconds = 2,
  }) async {
    if (!context.mounted) return;

    log('❌ [PERMISSION] $permissionName denied during active call', name: 'CallPermissionHelper');
    log('   Showing error and ending call in ${delaySeconds}s...', name: 'CallPermissionHelper');

    CallErrorHandler.showGenericError(
      context,
      '$permissionName permission is required for this call.',
    );

    // Give user time to see the error
    await Future.delayed(Duration(seconds: delaySeconds));

    if (context.mounted) {
      onEndCall();
    }
  }
}