import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_zoom_drawer/flutter_zoom_drawer.dart';
import 'package:provider/provider.dart';
import 'package:transitioned_indexed_stack/transitioned_indexed_stack.dart';
import 'package:veilid_support/veilid_support.dart';

import '../../account_manager/account_manager.dart';
import '../../chat/chat.dart';
import '../../theme/theme.dart';
import '../../tools/tools.dart';
import 'drawer_menu/drawer_menu.dart';
import 'home_account_invalid.dart';
import 'home_account_locked.dart';
import 'home_account_missing.dart';
import 'home_account_ready/home_account_ready.dart';
import 'home_no_active.dart';

class HomeScreen extends StatefulWidget {
  const HomeScreen({super.key});

  @override
  HomeScreenState createState() => HomeScreenState();

  static HomeScreenState? of(BuildContext context) =>
      context.findAncestorStateOfType<HomeScreenState>();
}

class HomeScreenState extends State<HomeScreen>
    with SingleTickerProviderStateMixin {
  @override
  void initState() {
    // Chat animation setup (open in phone mode)
    _chatAnimationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 250),
    );
    _chatAnimation = Tween<Offset>(
      begin: const Offset(1, 0),
      end: Offset.zero,
    ).animate(CurvedAnimation(
      parent: _chatAnimationController,
      curve: Curves.easeInOut,
    ));

    // Account animation setup

    super.initState();
  }

  @override
  void dispose() {
    _chatAnimationController.dispose();
    super.dispose();
  }

  Widget _buildAccountReadyDeviceSpecific(BuildContext context) {
    if (responsiveVisibility(
        context: context,
        tablet: false,
        tabletLandscape: false,
        desktop: false)) {
      return BlocConsumer<ActiveChatCubit, TypedKey?>(
          listener: (context, activeChat) {
            final hasActiveChat = activeChat != null;
            if (hasActiveChat) {
              _chatAnimationController.forward();
            } else {
              _chatAnimationController.reset();
            }
          },
          builder: (context, activeChat) => Stack(
                children: <Widget>[
                  const HomeAccountReadyMain(),
                  Offstage(
                      offstage: activeChat == null,
                      child: SlideTransition(
                          position: _chatAnimation,
                          child: const HomeAccountReadyChat())),
                ],
              ));
    }
    return const HomeAccountReadyMain();
  }

  Widget _buildAccountPage(
      BuildContext context,
      TypedKey superIdentityRecordKey,
      PerAccountCollectionState perAccountCollectionState) {
    switch (perAccountCollectionState.accountInfo.status) {
      case AccountInfoStatus.accountInvalid:
        return const HomeAccountInvalid();
      case AccountInfoStatus.accountLocked:
        return const HomeAccountLocked();
      case AccountInfoStatus.accountUnlocked:
        // Are we ready to render?
        if (!perAccountCollectionState.isReady) {
          return waitingPage();
        }

        // Re-export all ready blocs to the account display subtree
        return perAccountCollectionState.provide(
            child: Builder(builder: _buildAccountReadyDeviceSpecific));
    }
  }

  Widget _buildAccountPageView(BuildContext context) {
    final localAccounts = context.watch<LocalAccountsCubit>().state;
    final activeLocalAccount = context.watch<ActiveLocalAccountCubit>().state;
    final perAccountCollectionBlocMapState =
        context.watch<PerAccountCollectionBlocMapCubit>().state;

    final activeIndex = localAccounts
        .indexWhere((x) => x.superIdentity.recordKey == activeLocalAccount);
    if (activeIndex == -1) {
      return const HomeNoActive();
    }

    final accountPages = <Widget>[];

    for (var i = 0; i < localAccounts.length; i++) {
      final superIdentityRecordKey = localAccounts[i].superIdentity.recordKey;
      final perAccountCollectionState =
          perAccountCollectionBlocMapState.get(superIdentityRecordKey);
      if (perAccountCollectionState == null) {
        return HomeAccountMissing(key: ValueKey(superIdentityRecordKey));
      }
      final accountPage = _buildAccountPage(
          context, superIdentityRecordKey, perAccountCollectionState);
      accountPages.add(KeyedSubtree.wrap(accountPage, i));
    }

    return SlideIndexedStack(
      index: activeIndex,
      beginSlideOffset: const Offset(1, 0),
      children: accountPages,
    );
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final scale = theme.extension<ScaleScheme>()!;

    final gradient = LinearGradient(
        begin: Alignment.topCenter,
        end: Alignment.bottomCenter,
        colors: [
          scale.tertiaryScale.subtleBackground,
          scale.tertiaryScale.appBackground,
        ]);

    return SafeArea(
        child: DecoratedBox(
            decoration: BoxDecoration(gradient: gradient),
            child: ZoomDrawer(
              controller: _zoomDrawerController,
              //menuBackgroundColor: Colors.transparent,
              menuScreen: Builder(builder: (context) {
                final zoomDrawer = ZoomDrawer.of(context);
                zoomDrawer!.stateNotifier.addListener(() {
                  if (zoomDrawer.isOpen()) {
                    FocusManager.instance.primaryFocus?.unfocus();
                  }
                });
                return const DrawerMenu();
              }),
              mainScreen: Provider<ZoomDrawerController>.value(
                  value: _zoomDrawerController,
                  child: Builder(builder: _buildAccountPageView)),
              borderRadius: 24,
              //showShadow: false,
              angle: 0,
              drawerShadowsBackgroundColor: theme.shadowColor,
              mainScreenOverlayColor: theme.shadowColor.withAlpha(0x3F),
              openCurve: Curves.fastEaseInToSlowEaseOut,
              // duration: const Duration(milliseconds: 250),
              // reverseDuration: const Duration(milliseconds: 250),
              menuScreenTapClose: true,
              mainScreenTapClose: true,
              //disableDragGesture: false,
              mainScreenScale: .25,
              slideWidth: min(360, MediaQuery.of(context).size.width * 0.9),
            )));
  }

  ////////////////////////////////////////////////////////////////////////////

  final _zoomDrawerController = ZoomDrawerController();
  late final Animation<Offset> _chatAnimation;
  late final AnimationController _chatAnimationController;
}