import 'dart:async';
import 'dart:developer';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:provider/provider.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:test_sa/extensions/context_extension.dart';
import 'package:test_sa/extensions/int_extensions.dart';
import 'package:test_sa/extensions/text_extensions.dart';
import 'package:test_sa/extensions/widget_extensions.dart';
import 'package:test_sa/modules/cx_module/chat/chat_provider.dart';
import 'package:test_sa/modules/cx_module/chat/model/call_session.dart';
import 'package:test_sa/new_views/app_style/app_color.dart';
import 'package:test_sa/new_views/app_style/app_themes.dart';
import 'package:test_sa/modules/cx_module/chat/call/widgets/draggable_local_preview.dart';

class VideoCallPage extends StatefulWidget {
  const VideoCallPage({Key? key}) : super(key: key);

  @override
  State<VideoCallPage> createState() => _VideoCallPageState();
}

class _VideoCallPageState extends State<VideoCallPage> {
  Timer? _streamCheckTimer;
  bool _isLocalVideoFullscreen = false;

  @override
  void initState() {
    super.initState();

    if (kDebugMode) {
      log('🎬 [VIDEO CALL PAGE] Page initialized', name: 'VideoCallPage');
    }

    WidgetsBinding.instance.addPostFrameCallback((_) {
      final chatProvider = context.read<ChatProvider>();

      // Add listener to detect when call ends
      chatProvider.addListener(_checkCallStatus);

      // Start periodic check to ensure remote stream gets assigned
      _startStreamCheckTimer();
    });
  }

  void _startStreamCheckTimer() {
    // Check every 500ms if remote stream needs to be assigned
    _streamCheckTimer = Timer.periodic(const Duration(milliseconds: 500), (timer) {
      final chatProvider = context.read<ChatProvider>();
      final webrtc = chatProvider.webrtcService;

      if (webrtc == null || !mounted) {
        timer.cancel();
        return;
      }

      // If we have remote stream but renderer doesn't have it, assign it
      if (webrtc.remoteStream != null &&
          webrtc.remoteRenderer != null &&
          webrtc.remoteRenderer!.srcObject == null) {
        try {
          webrtc.remoteRenderer!.srcObject = webrtc.remoteStream;

          // Force UI rebuild
          if (mounted) {
            setState(() {});
          }
        } catch (e) {
          if (kDebugMode) {
            log('⚠️ [VIDEO CALL PAGE] Stream assignment failed: $e', name: 'VideoCallPage');
          }
        }
      }

      // If call is connected and remote stream is assigned, slow down checks
      if (chatProvider.callStatus == CallStatus.connected &&
          webrtc.remoteRenderer?.srcObject != null) {
        timer.cancel();

        // Switch to slower monitoring (every 5 seconds)
        Timer.periodic(const Duration(seconds: 5), (slowTimer) {
          if (!mounted) {
            slowTimer.cancel();
          }
        });
      }
    });
  }

  void _checkCallStatus() {
    final chatProvider = context.read<ChatProvider>();

    // If call ended, navigate back
    if (chatProvider.callStatus == CallStatus.idle && mounted) {
      chatProvider.removeListener(_checkCallStatus);
      Navigator.of(context).pop();
    }
  }

  @override
  void dispose() {
    // Cancel stream check timer
    _streamCheckTimer?.cancel();
    _streamCheckTimer = null;

    // Clean up listener
    try {
      context.read<ChatProvider>().removeListener(_checkCallStatus);
    } catch (e) {
      // Provider might already be disposed
      if (kDebugMode) {
        log('⚠️ [VIDEO CALL PAGE] Error removing listener: $e', name: 'VideoCallPage');
      }
    }
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColor.backgroundTabBarDark,
      body: SafeArea(
        top: false,
        child: Selector<ChatProvider, CallSession?>(
          selector: (_, provider) => provider.currentCall,
          builder: (context, session, _) {
            if (session == null) {
              return const Center(
                child: Text(
                  'No active call',
                  style: TextStyle(color: Colors.white),
                ),
              );
            }

            return Stack(
              children: [
                // Background video (fullscreen)
                _isLocalVideoFullscreen ? _buildFullscreenLocalVideo(context) : _buildRemoteVideo(context),

                // Small preview video (top-right corner)
                _isLocalVideoFullscreen ? _buildSmallRemoteVideo(context) : _buildLocalVideo(context),

                _buildTopBar(context, session),
                _buildBottomControls(context, session),
              ],
            );
          },
        ),
      ),
    );
  }

  // Fullscreen local video (when tapped)
  Widget _buildFullscreenLocalVideo(BuildContext context) {
    final chatProvider = context.read<ChatProvider>();

    return Positioned.fill(
      child: GestureDetector(
        onTap: () {
          setState(() {
            _isLocalVideoFullscreen = false; // Switch back to remote fullscreen
          });
        },
        child: Consumer<ChatProvider>(
          builder: (context, chatProvider, _) {
            if (!chatProvider.isCameraOn) {
              // Show avatar when camera is off
              return Container(
                color: Colors.grey[800],
                child: const Center(
                  child: Icon(
                    Icons.videocam_off,
                    color: Colors.white,
                    size: 64,
                  ),
                ),
              );
            }

            if (chatProvider.webrtcService?.localRenderer != null) {
              return RTCVideoView(
                chatProvider.webrtcService!.localRenderer!,
                objectFit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
                mirror: true,
              );
            }

            return Container(
              color: Colors.black,
              child: const Center(
                child: CircularProgressIndicator(color: Colors.white54),
              ),
            );
          },
        ),
      ),
    );
  }

  // Small remote video (when local is fullscreen)
  Widget _buildSmallRemoteVideo(BuildContext context) {
    return Positioned(
      top: MediaQuery.of(context).padding.top + 80,
      right: 16,
      child: GestureDetector(
        onTap: () {
          setState(() {
            _isLocalVideoFullscreen = false; // Switch back to remote fullscreen
          });
        },
        child: Consumer<ChatProvider>(
          builder: (context, chatProvider, _) {
            final remoteStream = chatProvider.webrtcService?.remoteStream;
            final remoteRenderer = chatProvider.webrtcService?.remoteRenderer;

            if (!chatProvider.isPeerCameraOn) {
              // Show avatar placeholder
              return Container(
                width: 120,
                height: 160,
                decoration: BoxDecoration(
                  color: AppColor.backgroundTabBarDark,
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: Colors.white, width: 2),
                ),
                child: Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Icon(Icons.videocam_off, color: Colors.white, size: 32),
                      8.height,
                      Text(
                        chatProvider.currentCall?.peerName.split(' ').first ?? '',
                        style: AppTextStyles.bodyText2.copyWith(
                          color: Colors.white,
                          fontSize: 12,
                        ),
                        textAlign: TextAlign.center,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    ],
                  ),
                ),
              );
            }

            if (remoteRenderer != null && remoteStream != null && remoteRenderer.srcObject != null) {
              return Container(
                width: 120,
                height: 160,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: Colors.white, width: 2),
                ),
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(12),
                  child: RTCVideoView(
                    remoteRenderer,
                    objectFit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
                    mirror: false,
                  ),
                ),
              );
            }

            return Container(
              width: 120,
              height: 160,
              decoration: BoxDecoration(
                color: Colors.black,
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: Colors.white, width: 2),
              ),
              child: const Center(
                child: CircularProgressIndicator(color: Colors.white54, strokeWidth: 2),
              ),
            );
          },
        ),
      ),
    );
  }

  Widget _buildRemoteVideo(BuildContext context) {
    return Positioned.fill(
      child: GestureDetector(
        onTap: () {
          setState(() {
            _isLocalVideoFullscreen = true; // Switch to local fullscreen
          });
        },
        child: Consumer<ChatProvider>(
          builder: (context, chatProvider, _) {
            final remoteRenderer = chatProvider.webrtcService?.remoteRenderer;
            final remoteStream = chatProvider.webrtcService?.remoteStream;

            if (remoteRenderer != null) {
              if (remoteRenderer.srcObject == null && remoteStream != null) {
                // Renderer exists but srcObject is null, assign it
                WidgetsBinding.instance.addPostFrameCallback((_) {
                  final renderer = chatProvider.webrtcService?.remoteRenderer;
                  final stream = chatProvider.webrtcService?.remoteStream;
                  if (renderer != null && stream != null && renderer.srcObject == null) {
                    renderer.srcObject = stream;
                    // Force UI rebuild
                    if (mounted) {
                      setState(() {});
                    }
                  }
                });
              }

              // If renderer has stream OR we just assigned it, show the video view
              final hasRendererStream = remoteRenderer.srcObject != null;

              if (hasRendererStream) {
                return RTCVideoView(
                  remoteRenderer,
                  objectFit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
                  mirror: false,
                );
              }
            }

            // Fallback while waiting for remote stream
            return Container(
              color: Colors.black,
              child: const Center(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    CircularProgressIndicator(color: Colors.white54),
                    SizedBox(height: 16),
                    Text(
                      'Waiting for video...',
                      style: TextStyle(color: Colors.white54),
                    ),
                  ],
                ),
              ),
            );
          },
        ),
      ),
    );
  }

  Widget _buildRemoteAvatarPlaceholder(BuildContext context) {
    return Selector<ChatProvider, CallSession?>(
      selector: (_, provider) => provider.currentCall,
      builder: (context, session, _) {
        if (session == null) return const SizedBox.shrink();

        return Container(
            color: AppColor.backgroundTabBarDark,
            child: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Stack(
                    alignment: Alignment.center,
                    children: [
                      Container(
                        padding: const EdgeInsets.all(14),
                        decoration: BoxDecoration(
                          shape: BoxShape.circle,
                          color: AppColor.whiteF8d,
                          border: Border.all(color: AppColor.white10.withAlpha(51), width: 1),
                        ),
                        child: ClipOval(
                          child: session.peerAvatar != null
                              ? CachedNetworkImage(
                                  imageUrl: session.peerAvatar!,
                                  fit: BoxFit.cover,
                                  placeholder: (context, url) => Center(
                                    child: CircularProgressIndicator(
                                      color: Colors.white.withAlpha(128),
                                    ),
                                  ),
                                  errorWidget: (context, url, error) => 'call_user_avatar'.toSvgAsset(height: 48, width: 48),
                                )
                              : 'call_user_avatar'.toSvgAsset(height: 48, width: 48),
                        ),
                      ),
                      // Show mute indicator badge when peer is muted
                      Selector<ChatProvider, bool>(
                        selector: (_, provider) => provider.isPeerMuted,
                        builder: (context, isPeerMuted, _) {
                          if (!isPeerMuted) return const SizedBox.shrink();

                          return Positioned(
                            bottom: 0,
                            right: 0,
                            child: Container(
                              padding: const EdgeInsets.all(8),
                              decoration: BoxDecoration(
                                color: AppColor.red30,
                                shape: BoxShape.circle,
                                border: Border.all(color: AppColor.white10, width: 2),
                              ),
                              child: 'mic_disable'.toSvgAsset(
                                width: 16,
                                height: 16,
                                color: AppColor.white10,
                              ),
                            ),
                          );
                        },
                      ),
                    ],
                  ),
                  24.height,
                  Text(
                    session.peerName,
                    style: AppTextStyles.heading2.copyWith(
                      color: Colors.white,
                      fontWeight: FontWeight.w600,
                    ),
                    textAlign: TextAlign.center,
                  ),
                  8.height,
                  Text(
                    'Camera is off',
                    style: AppTextStyles.heading5.copyWith(
                      color: AppColor.neutral100,
                      fontWeight: FontWeight.w400,
                    ),
                  ),
                  // Show mute status when peer is muted
                  Selector<ChatProvider, bool>(
                    selector: (_, provider) => provider.isPeerMuted,
                    builder: (context, isPeerMuted, _) {
                      if (!isPeerMuted) return const SizedBox.shrink();

                      return Column(
                        children: [
                          8.height,
                          Container(
                            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                            decoration: BoxDecoration(
                              color: AppColor.red30.withOpacity(0.3),
                              borderRadius: BorderRadius.circular(12),
                            ),
                            child: Row(
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                'mic_disable'.toSvgAsset(
                                  width: 14,
                                  height: 14,
                                  color: AppColor.white10,
                                ),
                                6.width,
                                Text(
                                  'Microphone is off',
                                  style: AppTextStyles.bodyText2.copyWith(
                                    color: AppColor.white10,
                                    fontSize: 12,
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ],
                      );
                    },
                  ),
                ],
              ),
            ));
      },
    );
  }

  Widget _buildLocalVideo(BuildContext context) {
    final chatProvider = context.read<ChatProvider>();

    return Positioned(
      top: MediaQuery.of(context).padding.top + 80,
      right: 16,
      child: GestureDetector(
        onTap: () {
          setState(() {
            _isLocalVideoFullscreen = true; // Make local video fullscreen
          });
        },
        child: Selector<ChatProvider, bool>(
          selector: (_, provider) => provider.isCameraOn,
          builder: (context, isCameraOn, _) {
            if (!isCameraOn) {
              return Container(
                width: 120,
                height: 160,
                decoration: BoxDecoration(
                  color: Colors.grey[800],
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: Colors.white, width: 2),
                ),
                child: const Icon(
                  Icons.videocam_off,
                  color: Colors.white,
                  size: 32,
                ),
              );
            }

            if (chatProvider.webrtcService?.localRenderer != null) {
              return Container(
                width: 120,
                height: 160,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: Colors.white, width: 2),
                ),
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(12),
                  child: RTCVideoView(
                    chatProvider.webrtcService!.localRenderer!,
                    objectFit: RTCVideoViewObjectFit.RTCVideoViewObjectFitCover,
                    mirror: true,
                  ),
                ),
              );
            }

            return Container(
              width: 120,
              height: 160,
              decoration: BoxDecoration(
                color: Colors.black,
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: Colors.white, width: 2),
              ),
              child: const Center(
                child: CircularProgressIndicator(color: Colors.white54, strokeWidth: 2),
              ),
            );
          },
        ),
      ),
    );
  }

  Widget _buildTopBar(BuildContext context, CallSession session) {
    return Positioned(
      top: 0,
      left: 0,
      right: 0,
      child: Container(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            colors: [
              Colors.black.withOpacity(0.7),
              Colors.transparent,
            ],
          ),
        ),
        padding: EdgeInsets.only(
          top: MediaQuery.of(context).padding.top + 8,
          left: 16,
          right: 16,
          bottom: 24,
        ),
        child: Row(
          children: [
            IconButton(
              icon: const Icon(Icons.arrow_back, color: Colors.white),
              onPressed: () => Navigator.pop(context),
            ),
            Expanded(
              child: Column(
                children: [
                  Text(
                    session.peerName,
                    style: AppTextStyles.bodyText2.copyWith(
                      color: Colors.white,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  4.height,
                  _buildCallStatusAndDuration(),
                ],
              ),
            ),
            const SizedBox(width: 48),
          ],
        ),
      ),
    );
  }

  Widget _buildCallStatusAndDuration() {
    return Selector<ChatProvider, Duration>(
      selector: (_, provider) => provider.callDuration,
      builder: (context, duration, _) {
        if (duration.inSeconds == 0) {
          return Selector<ChatProvider, CallStatus>(
            selector: (_, provider) => provider.callStatus,
            builder: (context, status, _) {
              String statusText;
              switch (status) {
                case CallStatus.outgoingRinging:
                  statusText = 'Calling...';
                  break;
                case CallStatus.connecting:
                  statusText = 'Connecting...';
                  break;
                default:
                  statusText = '';
              }
              return Text(
                statusText,
                style: AppTextStyles.bodyText.copyWith(
                  color: Colors.white70,
                ),
              );
            },
          );
        }

        String twoDigits(int n) => n.toString().padLeft(2, '0');
        final minutes = twoDigits(duration.inMinutes.remainder(60));
        final seconds = twoDigits(duration.inSeconds.remainder(60));

        return Text(
          '$minutes:$seconds',
          style: AppTextStyles.bodyText.copyWith(
            color: Colors.white,
            fontFeatures: [const FontFeature.tabularFigures()],
          ),
        );
      },
    );
  }

  Widget _buildBottomControls(BuildContext context, CallSession session) {
    final chatProvider = context.read<ChatProvider>();
    return Positioned(
      bottom: 0,
      left: 0,
      right: 0,
      child: Container(
        decoration: BoxDecoration(
          gradient: const LinearGradient(
            begin: Alignment.centerLeft,
            end: Alignment.centerRight,
            colors: [
              Color.fromRGBO(65, 67, 82, 0.7),
              Color.fromRGBO(105, 109, 133, 0.7),
              Color.fromRGBO(65, 67, 82, 0.7),
            ],
            stops: [0.0, 0.5, 1.0],
          ),
          borderRadius: BorderRadius.circular(10),
          border: Border.all(color: AppColor.white10.withAlpha(51)),
        ),
        padding: const EdgeInsets.all(16),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            // Name with mute indicator on the right
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  session.peerName,
                  style: AppTextStyles.heading2.copyWith(
                    color: Colors.white,
                    fontWeight: FontWeight.w600,
                  ),
                  textAlign: TextAlign.center,
                ),
                // Mute indicator badge (top-right of name)
                Selector<ChatProvider, bool>(
                  selector: (_, provider) => provider.isPeerMuted,
                  builder: (context, isPeerMuted, _) {
                    if (!isPeerMuted) return const SizedBox.shrink();

                    return Padding(
                      padding: const EdgeInsets.only(left: 8),
                      child: Container(
                        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                        decoration: BoxDecoration(
                          color: AppColor.red30,
                          borderRadius: BorderRadius.circular(12),
                          border: Border.all(color: AppColor.white10.withOpacity(0.3), width: 1),
                        ),
                        child: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            'mic_disable'.toSvgAsset(
                              width: 14,
                              height: 14,
                              color: AppColor.white10,
                            ),
                            4.width,
                            Text(
                              'Muted',
                              style: AppTextStyles.bodyText2.copyWith(
                                color: AppColor.white10,
                                fontSize: 12,
                                fontWeight: FontWeight.w600,
                              ),
                            ),
                          ],
                        ),
                      ),
                    );
                  },
                ),
              ],
            ),
            16.height,
            _buildCallStatusOrDuration(context),
            16.height,
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                Selector<ChatProvider, bool>(
                  selector: (_, provider) => provider.isMuted,
                  builder: (context, isMuted, _) {
                    return _buildVideoControlButton(
                      icon: isMuted ? 'mic_disable' : 'mic_enable',
                      isActive: isMuted,
                      onPressed: () => chatProvider.toggleMute(),
                    );
                  },
                ),

                // Camera toggle
                Selector<ChatProvider, bool>(
                  selector: (_, provider) => provider.isCameraOn,
                  builder: (context, isCameraOn, _) {
                    return _buildVideoControlButton(
                      icon: isCameraOn ? 'video_enable' : 'video_disable',
                      isActive: !isCameraOn,
                      onPressed: () => chatProvider.toggleCamera(),
                    );
                  },
                ),

                // Switch camera
                _buildVideoControlButton(
                  icon: 'toggle_camera',
                  isActive: false,
                  onPressed: () => chatProvider.switchCamera(),
                ),

                // Speaker
                Selector<ChatProvider, bool>(
                  selector: (_, provider) => provider.isSpeakerOn,
                  builder: (context, isSpeakerOn, _) {
                    return _buildVideoControlButton(
                      icon: 'speaker_enable',
                      isActive: isSpeakerOn,
                      onPressed: () => chatProvider.toggleSpeaker(),
                    );
                  },
                ),
                _buildVideoControlButton(
                  icon: 'end_call',
                  isHangUp: true,
                  showBorder: false,
                  onPressed: () {
                    chatProvider.hangUp();
                    // Removed Navigator.pop() - automatic listener will handle navigation
                  },
                ),
              ],
            ),
          ],
        ),
      ).paddingOnly(bottom: 16, start: 16, end: 16),
    );
  }

  Widget _buildCallStatusOrDuration(BuildContext context) {
    return Selector<ChatProvider, CallStatus>(
      selector: (_, provider) => provider.callStatus,
      builder: (context, status, _) {
        String statusText;
        switch (status) {
          case CallStatus.outgoingRinging:
            statusText = 'Calling...';
            break;
          case CallStatus.incomingRinging:
            statusText = 'Incoming call...';
            break;
          case CallStatus.connecting:
            statusText = 'Connecting...';
            break;
          case CallStatus.connected:
            return _buildDuration(context);
          default:
            statusText = '';
        }
        return Text(
          statusText,
          style: AppTextStyles.heading5.copyWith(
            color: AppColor.neutral100,
            fontWeight: FontWeight.w400,
          ),
        );
      },
    );
  }

  Widget _buildDuration(BuildContext context) {
    return Selector<ChatProvider, Duration>(
      selector: (_, provider) => provider.callDuration,
      builder: (context, duration, _) {
        if (duration.inSeconds == 0) {
          return const SizedBox.shrink();
        }

        String twoDigits(int n) => n.toString().padLeft(2, '0');
        final minutes = twoDigits(duration.inMinutes.remainder(60));
        final seconds = twoDigits(duration.inSeconds.remainder(60));

        return Text(
          '$minutes:$seconds',
          style: AppTextStyles.heading5.copyWith(
            color: AppColor.neutral100,
            fontWeight: FontWeight.w400,
            fontFeatures: [const FontFeature.tabularFigures()],
          ),
        );
      },
    );
  }

  Widget _buildVideoControlButton({
    required String icon,
    bool? isActive,
    bool isHangUp = false,
    bool showBorder = true,
    required VoidCallback onPressed,
  }) {
    return Container(
      padding: const EdgeInsets.all(18),
      decoration: BoxDecoration(
          color: isHangUp
              ? AppColor.red30
              : isActive != null && isActive
                  ? AppColor.primary10
                  : AppColor.black2E,
          shape: BoxShape.circle,
          border: showBorder ? BoxBorder.all(color: AppColor.white10.withOpacity(0.2)) : null),
      child: icon.toSvgAsset(width: 24, height: 24, color: AppColor.white10),
    ).onPress(() {
      onPressed();
    });
  }
}