import "dart:async";

import "package:bus_running_record/models/channels/base_channel.dart";
import "package:bus_running_record/models/channels/operations_channel.dart";
import "package:bus_running_record/models/channels/text_channel.dart";
import "package:bus_running_record/pages/home/channels/operations_channel_view.dart";
import "package:bus_running_record/pages/home/channels/text_channel_view.dart";
import "package:bus_running_record/pages/home/widgets/swiper.dart";
import "package:bus_running_record/pages/home/widgets/channel_header.dart";
import "package:bus_running_record/pages/home/widgets/home_left_sidebar.dart";
import "package:bus_running_record/provider/collaboration_state.dart";
import "package:bus_running_record/provider/supabase_state.dart";
import "package:go_router/go_router.dart";
import "package:provider/provider.dart";
import "package:shadcn_flutter/shadcn_flutter.dart";

class HomePage extends StatefulWidget {
  static GoRoute rootRoute = GoRoute(
    path: "/",
    builder: (context, state) => const HomePage(),
  );

  static GoRoute channelRoute = GoRoute(
    path: "/channel/:orgId/:channelId",
    builder: (context, state) => HomePage(
      organizationId: state.pathParameters["orgId"],
      channelId: state.pathParameters["channelId"],
    ),
  );

  const HomePage({this.organizationId, this.channelId, super.key});

  final String? organizationId;
  final String? channelId;

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  String? _lastSyncedRouteKey;

  Future<void> _syncRouteSelection() async {
    final orgId = widget.organizationId;
    final channelId = widget.channelId;
    if (orgId == null || channelId == null) return;

    final routeKey = "$orgId/$channelId";
    if (_lastSyncedRouteKey == routeKey) return;
    _lastSyncedRouteKey = routeKey;

    final collab = context.read<CollaborationProvider>();
    if (collab.selectedOrganizationId != orgId) {
      await collab.selectOrganization(orgId);
    }

    final channels = collab.channelsForOrganization(orgId);
    if (channels.any((channel) => channel.id == channelId)) {
      collab.selectChannel(channelId);
    }
  }

  @override
  Widget build(BuildContext context) {
    if (widget.organizationId != null && widget.channelId != null) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (!mounted) return;
        unawaited(_syncRouteSelection());
      });
    } else {
      _lastSyncedRouteKey = null;
    }

    final isMobile = MediaQuery.of(context).size.width < 600;

    if (isMobile) {
      return const SidebarSwiper(
        sidebar: HomeLeftSidebar(),
        child: Scaffold(
          child: Row(children: [Expanded(child: _HomeChannelPane())]),
        ),
      );
    }

    return const Scaffold(
      child: Row(
        children: [
          HomeLeftSidebar(),
          VerticalDivider(),
          Expanded(child: _HomeChannelPane()),
        ],
      ),
    );
  }
}

class _HomeChannelPane extends StatelessWidget {
  const _HomeChannelPane();

  ChannelSummary? _findChannel(
    CollaborationProvider collab,
    String? organizationId,
    String? channelId,
  ) {
    if (organizationId == null || channelId == null) return null;
    final channels = collab.channelsForOrganization(organizationId);
    for (final channel in channels) {
      if (channel.id == channelId) {
        return channel;
      }
    }
    return null;
  }

  BaseChannel? _buildChannelModel(
    BuildContext context,
    ChannelSummary? selectedChannel,
  ) {
    if (selectedChannel == null) return null;
    final client = context.read<SupabaseProvider>().client;

    if (selectedChannel.type == "operations") {
      return OperationsChannel(
        client: client,
        id: selectedChannel.id,
        organizationId: selectedChannel.organizationId,
        name: selectedChannel.name,
        description: selectedChannel.description,
        slug: selectedChannel.slug,
        isPrivate: selectedChannel.isPrivate,
        position: selectedChannel.position,
      );
    }

    return TextChannel(
      client: client,
      id: selectedChannel.id,
      organizationId: selectedChannel.organizationId,
      name: selectedChannel.name,
      description: selectedChannel.description,
      slug: selectedChannel.slug,
      isPrivate: selectedChannel.isPrivate,
      position: selectedChannel.position,
    );
  }

  Widget _buildChannelContent({
    required BaseChannel? channel,
  }) {
    if (channel == null) {
      return Center(
        child: Text("Pick a channel to start chatting.").small.muted,
      );
    }

    if (channel is OperationsChannel) {
      return OperationsChannelView(channel: channel);
    }

    final textChannel = channel as TextChannel;
    return TextChannelView(
      key: ValueKey("text-channel-${textChannel.id}"),
      channel: textChannel,
    );
  }

  @override
  Widget build(BuildContext context) {
    final collab = context.watch<CollaborationProvider>();
    final selectedOrg = collab.selectedOrganizationId;
    final selectedChannelId = collab.selectedChannelId;
    final selectedChannel = _findChannel(
      collab,
      selectedOrg,
      selectedChannelId,
    );
    final channel = _buildChannelModel(context, selectedChannel);
    final channelBody = _buildChannelContent(
      channel: channel,
    );

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        if (channel != null) ...[
          ChannelHeader(channel: channel),
        ],
        Expanded(child: channelBody),
      ],
    );
  }
}