import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:test_sa/border_beam/src/beam_style.dart';
import 'package:test_sa/border_beam/src/border_beam.dart';
import 'package:test_sa/controllers/providers/api/user_provider.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/new_views/app_style/app_color.dart';
import 'package:test_sa/new_views/common_widgets/default_app_bar.dart';
import 'package:test_sa/thinking_orbs/src/thinking_orb.dart';
import '../controller/copilot_provider.dart';
import '../widgets/copilot_message_bubble.dart';

/// Push-to-Talk realtime voice screen for Copilot.
class CopilotPushToTalkPage extends StatefulWidget {
  const CopilotPushToTalkPage({Key? key}) : super(key: key);

  @override
  State<CopilotPushToTalkPage> createState() => _CopilotPushToTalkPageState();
}

class _CopilotPushToTalkPageState extends State<CopilotPushToTalkPage> with WidgetsBindingObserver {
  final ScrollController _scrollController = ScrollController();
  CopilotProvider? _provider;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _provider = context.read<CopilotProvider>();
  }

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      final provider = context.read<CopilotProvider>();
      provider.startNewPttConversation();
      provider.connectPushToTalkHub().catchError((_) {});
    });
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.paused) {
      // OS suspends sockets/mic in background; stop any in-progress turn.
      _provider?.cancelPushToTalk().catchError((_) {});
    } else if (state == AppLifecycleState.resumed) {
      _provider?.ensurePushToTalkConnected().catchError((_) {});
    }
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    _scrollController.dispose();
    _provider?.cancelPushToTalk().catchError((_) {});
    _provider?.disconnectPushToTalkHub().catchError((_) {});
    super.dispose();
  }

  void _scrollToBottom() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (_scrollController.hasClients) {
        _scrollController.animateTo(
          _scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 250),
          curve: Curves.easeOut,
        );
      }
    });
  }

  String _statusLabel(PttStatus status) {
    switch (status) {
      case PttStatus.idle:
        return "Hold the mic and speak";
      case PttStatus.connecting:
        return "Connecting…";
      case PttStatus.recording:
        return "Listening…";
      case PttStatus.thinking:
        return "Thinking…";
      case PttStatus.playingAudio:
        return "Speaking…";
      case PttStatus.error:
        return "Something went wrong";
    }
  }

  /// Shown in place of the mic while the socket is connecting / disconnected.
  Widget _buildConnectionPlaceholder(BuildContext context, CopilotProvider provider) {
    // Treat "disconnected without an error" as connecting (e.g. the first frame
    // before the connection attempt kicks off).
    final isConnecting = provider.pttHubState == PttHubState.connecting || provider.pttErrorMessage == null;
    return SizedBox(
      height: 148,
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        mainAxisSize: MainAxisSize.min,
        children: [
          if (isConnecting) ...[
            const SizedBox(height: 28, width: 28, child: CircularProgressIndicator(strokeWidth: 2.5)),
            12.height,
            Text(
              "Connecting…",
              style: AppTextStyles.bodyText2.copyWith(color: AppColor.lightTextColor(context)),
            ),
          ] else
            TextButton.icon(
              onPressed: () => provider.ensurePushToTalkConnected().catchError((_) {}),
              icon: const Icon(Icons.refresh_rounded),
              label: const Text("Retry connection"),
            ),
        ],
      ),
    ).paddingOnly(top: 8, bottom: 8);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: const DefaultAppBar(title: "Push to Talk"),
      body: Column(
        children: [
          Expanded(
            child: Consumer<CopilotProvider>(
              builder: (context, provider, _) {
                if (provider.pttMessages.isEmpty) {
                  return Column(
                    crossAxisAlignment: CrossAxisAlignment.center,
                    spacing: 24,
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      "atoms_logo".toSvgAsset(width: 54),
                      Text(
                        "Press and hold the mic to talk",
                        overflow: TextOverflow.ellipsis,
                        maxLines: 1,
                        style: AppTextStyles.heading6.copyWith(color: AppColor.lightTextColor(context), fontWeight: FontWeight.w500),
                      ),
                    ],
                  ).center;
                }

                _scrollToBottom();
                final messages = provider.pttMessages;
                return ListView.builder(
                  controller: _scrollController,
                  padding: const EdgeInsets.all(16),
                  itemCount: messages.length,
                  itemBuilder: (context, index) {
                    final currentMessage = messages[index];
                    final bool showHeader = index == 0 || currentMessage.role != messages[index - 1].role;
                    return CopilotMessageBubble(
                      message: currentMessage,
                      showHeader: showHeader,
                      userAvatar: Provider.of<UserProvider>(context, listen: false).user?.profilePhotoName,
                    );
                  },
                );
              },
            ),
          ),
          Consumer<CopilotProvider>(
            builder: (context, provider, _) {
              if (provider.pttErrorMessage == null) return const SizedBox();
              return Container(
                width: double.infinity,
                color: Colors.red.withValues(alpha: 0.1),
                padding: const EdgeInsets.all(8),
                child: Text(provider.pttErrorMessage!, style: const TextStyle(color: Colors.red)),
              );
            },
          ),
          SafeArea(
            child: Consumer<CopilotProvider>(
              builder: (context, provider, _) {
                // Hide the mic until the socket connection is established.
                if (provider.pttHubState != PttHubState.connected) {
                  return _buildConnectionPlaceholder(context, provider);
                }
                final status = provider.pttStatus;
                final isRecording = status == PttStatus.recording;
                final isBusy = status == PttStatus.connecting || status == PttStatus.thinking || status == PttStatus.playingAudio;

                return Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(
                      _statusLabel(status),
                      style: AppTextStyles.bodyText2.copyWith(color: AppColor.lightTextColor(context)),
                    ),
                    16.height,
                    Container(
                      height: 100,
                      alignment: Alignment.center,
                      child: Container(
                        padding: const EdgeInsets.all(0),
                        decoration: BoxDecoration(color: AppColor.background(context), shape: BoxShape.circle, border: Border.all(color: Colors.transparent)),
                        child: BorderBeam(
                          size: BeamSize.pulseOutside,
                          colorVariant: BeamColorVariant.colorful,
                          reserveGlowSpace: false,
                          borderRadius: 50,
                          strength: 0.7,
                          child: GestureDetector(
                            onLongPressStart: isBusy
                                ? null
                                : (_) {
                                    context.read<CopilotProvider>().beginPushToTalk(context.settingProvider.language!).catchError((_) {});
                                  },
                            onLongPressEnd: (_) {
                              context.read<CopilotProvider>().endPushToTalk().catchError((_) {});
                            },
                            onLongPressCancel: () {
                              context.read<CopilotProvider>().endPushToTalk().catchError((_) {});
                            },
                            child: AnimatedContainer(
                              duration: const Duration(milliseconds: 150),
                              height: isRecording ? 96 : 80,
                              width: isRecording ? 96 : 80,
                              child: isBusy
                                  ? Padding(
                                      padding: const EdgeInsets.all(12),
                                      child: ThinkingOrb(
                                        size: 48,
                                        state: ThinkingOrbState.working,
                                        theme: context.isDark ? ThinkingOrbTheme.dark : ThinkingOrbTheme.light,
                                      ),
                                    )
                                  : Icon(Icons.mic_rounded, color: AppColor.icon2Color(context), size: isRecording ? 44 : 36),
                            ),
                          ),
                          // "atoms_logo".toSvgAsset().paddingAll(16),
                        ),
                      ),
                    ),
                    24.height,
                  ],
                ).paddingOnly(top: 8, bottom: 8);
              },
            ),
          ),
        ],
      ),
    );
  }
}