import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../core/auth/auth_notifier.dart';
import '../../core/status/status_notifier.dart';
import '../../core/chat/chat_request_notifier.dart';
import '../../core/theme/halo_tokens.dart';
import '../../core/theme/widgets/widgets.dart';
import '../undangan/undangan_screen.dart' show undanganTabProvider;

/// Bestie Home (mitra). Mirrors
/// `figma-bestie/project/screens/v4.jsx::BestieHome` (online variant) +
/// `figma-bestie/project/screens/v5.jsx::BestieHomeOffline` (offline variant).
///
/// Lives inside the Home branch of the shell (`router.dart`), so the
/// `BestieTabBar` is rendered by `ShellScreen` — this screen owns body
/// content only.
class HomeScreen extends ConsumerWidget {
  const HomeScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final authState = ref.watch(mitraAuthProvider);
    final authData = authState.valueOrNull;
    final displayName = authData is MitraAuthAuthenticatedData
        ? (authData.profile['display_name'] as String? ?? 'Bestie')
        : 'Bestie';

    final statusState = ref.watch(onlineStatusProvider);
    final isOnline = statusState is StatusLoadedData && statusState.isOnline;

    // Boot chat-request listener whenever mitra is online (existing logic).
    if (statusState is StatusLoadedData && statusState.isOnline) {
      final requestState = ref.watch(chatRequestProvider);
      if (requestState is ChatRequestIdleData) {
        Future.microtask(() {
          ref.read(chatRequestProvider.notifier).startListening();
          ref.read(chatRequestProvider.notifier).loadPendingRequests();
        });
      }
    }

    ref.listen(onlineStatusProvider, (prev, next) {
      if (next is StatusLoadedData && next.isOnline) {
        ref.read(chatRequestProvider.notifier).startListening();
        ref.read(chatRequestProvider.notifier).loadPendingRequests();
      } else if (next is StatusLoadedData && !next.isOnline) {
        ref.read(chatRequestProvider.notifier).stopListening();
      }
    });

    return Scaffold(
      backgroundColor: HaloTokens.bg,
      body: SafeArea(
        child: isOnline
            ? _OnlineHome(displayName: displayName)
            : _OfflineHome(displayName: displayName),
      ),
    );
  }
}

// ─── Online variant — matches v4.jsx:417 ──────────────────────────────
class _OnlineHome extends StatelessWidget {
  final String displayName;
  const _OnlineHome({required this.displayName});

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: const EdgeInsets.fromLTRB(20, 20, 20, 28),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          _Header(displayName: displayName, isOnline: true),
          const SizedBox(height: 18),
          const _TilesGrid(),
          const SizedBox(height: 14),
          const _StatusCard(isOnline: true),
          const SizedBox(height: 10),
          const _GantiStatusButton(),
          const SizedBox(height: 22),
          const _Pengingat(),
        ],
      ),
    );
  }
}

// ─── Offline variant — matches v5.jsx:188 ─────────────────────────────
class _OfflineHome extends StatelessWidget {
  final String displayName;
  const _OfflineHome({required this.displayName});

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: const EdgeInsets.fromLTRB(20, 20, 20, 28),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          _Header(displayName: displayName, isOnline: false),
          const SizedBox(height: 28),
          Container(
            padding: const EdgeInsets.all(24),
            decoration: BoxDecoration(
              color: const Color(0xFFFCE8E8),
              borderRadius: HaloRadius.lg,
              border: Border.all(color: const Color(0xFFF5B5B5), width: 1.5),
            ),
            child: const Column(
              children: [
                Text('😴', style: TextStyle(fontSize: 44)),
                SizedBox(height: 10),
                Text(
                  'Kamu lagi OFFLINE',
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    fontFamily: HaloTokens.fontDisplay,
                    fontSize: 17,
                    fontWeight: FontWeight.w700,
                    color: Color(0xFF7A2828),
                  ),
                ),
                SizedBox(height: 10),
                SizedBox(
                  width: 260,
                  child: Text(
                    'Gak terima curhat dulu. Istirahat dulu ya — nyalain ONLINE kalo udah siap lagi 💛',
                    textAlign: TextAlign.center,
                    style: TextStyle(
                      fontFamily: HaloTokens.fontBody,
                      fontSize: 13,
                      height: 1.5,
                      color: Color(0xFF9C4040),
                    ),
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 16),
          const _GantiStatusButton(offlineLabel: 'Nyalain Status (Online)'),
        ],
      ),
    );
  }
}

/// Home header — greeting block. Logout moved to Profil tab in Stage 4
/// (was a `more_horiz` bottom-sheet menu here pre-Stage-4).
class _Header extends StatelessWidget {
  final String displayName;
  final bool isOnline;
  const _Header({required this.displayName, required this.isOnline});

  @override
  Widget build(BuildContext context) {
    final greetingSuffix = isOnline ? '🌸' : '🌙';
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Hei,',
          style: TextStyle(
            fontFamily: HaloTokens.fontBody,
            fontSize: 13,
            color: HaloTokens.inkSoft,
          ),
        ),
        Text(
          'Bestie $displayName $greetingSuffix',
          style: const TextStyle(
            fontFamily: HaloTokens.fontDisplay,
            fontSize: 24,
            fontWeight: FontWeight.w700,
            color: HaloTokens.brandDark,
            letterSpacing: -0.4,
          ),
        ),
      ],
    );
  }
}

class _TilesGrid extends ConsumerWidget {
  const _TilesGrid();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    ref.watch(chatRequestProvider);
    final undanganCount =
        ref.read(chatRequestProvider.notifier).activeRequestCount;
    final shell = StatefulNavigationShell.of(context);

    // Both tiles route to the Chat tab's Undangan screen, differing only in
    // which sub-tab they pre-select via `undanganTabProvider`. Tiles must
    // stay tappable even at count=0 (destination shows its empty state).
    return Row(
      children: [
        Expanded(
          child: _DarkTile(
            icon: '📨',
            label: 'Undangan',
            subtitle:
                undanganCount > 0 ? 'Menunggu: $undanganCount' : 'Belum ada',
            badgeCount: undanganCount,
            onTap: () {
              ref.read(undanganTabProvider.notifier).state = 0;
              shell.goBranch(1);
            },
          ),
        ),
        const SizedBox(width: 10),
        // Perpanjang tile — `MitraExtension` notifier holds per-flow state
        // only (idle/responding/...), no pending-list. Keep static "Belum ada"
        // until backend exposes a pending-extension count.
        // TODO(stage-2): wire extension count when extension_notifier
        // exposes it (or once a dedicated pending-extensions provider exists).
        Expanded(
          child: _DarkTile(
            icon: '⚡',
            label: 'Perpanjang',
            subtitle: 'Belum ada',
            badgeCount: 0,
            onTap: () {
              ref.read(undanganTabProvider.notifier).state = 1;
              shell.goBranch(1);
            },
          ),
        ),
      ],
    );
  }
}

class _DarkTile extends StatelessWidget {
  final String icon;
  final String label;
  final String subtitle;
  final int badgeCount;
  final VoidCallback? onTap;

  const _DarkTile({
    required this.icon,
    required this.label,
    required this.subtitle,
    required this.badgeCount,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    final card = Container(
      padding: const EdgeInsets.all(14),
      decoration: const BoxDecoration(
        color: Color(0xFF2A1820),
        borderRadius: HaloRadius.lg,
      ),
      child: Stack(
        children: [
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(icon, style: const TextStyle(fontSize: 18)),
              const SizedBox(height: 6),
              Text(
                label,
                style: const TextStyle(
                  fontFamily: HaloTokens.fontBody,
                  fontSize: 14,
                  fontWeight: FontWeight.w700,
                  color: Colors.white,
                ),
              ),
              const SizedBox(height: 2),
              Text(
                subtitle,
                style: const TextStyle(
                  fontFamily: HaloTokens.fontBody,
                  fontSize: 11,
                  color: Color(0xB3FFFFFF),
                ),
              ),
            ],
          ),
          if (badgeCount > 0)
            Positioned(
              top: 0,
              right: 0,
              child: Container(
                width: 18,
                height: 18,
                alignment: Alignment.center,
                decoration: const BoxDecoration(
                  color: Color(0xFFFF4D6A),
                  shape: BoxShape.circle,
                ),
                child: Text(
                  '$badgeCount',
                  style: const TextStyle(
                    fontFamily: HaloTokens.fontBody,
                    color: Colors.white,
                    fontSize: 11,
                    fontWeight: FontWeight.w700,
                  ),
                ),
              ),
            ),
        ],
      ),
    );

    return Material(
      color: Colors.transparent,
      child: InkWell(
        borderRadius: HaloRadius.lg,
        onTap: onTap,
        child: card,
      ),
    );
  }
}

class _StatusCard extends StatelessWidget {
  final bool isOnline;
  const _StatusCard({required this.isOnline});

  @override
  Widget build(BuildContext context) {
    final bgColor = isOnline ? const Color(0xFFE8F7EE) : const Color(0xFFFCE8E8);
    final borderColor =
        isOnline ? const Color(0xFF9DD9B1) : const Color(0xFFF5B5B5);
    final titleColor =
        isOnline ? const Color(0xFF1F6B3B) : const Color(0xFF7A2828);
    final subColor =
        isOnline ? const Color(0xFF3F8956) : const Color(0xFF9C4040);
    final dot = isOnline ? '🟢' : '🔴';

    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: bgColor,
        borderRadius: HaloRadius.md,
        border: Border.all(color: borderColor),
      ),
      child: Row(
        children: [
          Text(dot, style: const TextStyle(fontSize: 14)),
          const SizedBox(width: 10),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Kamu lagi ${isOnline ? 'ONLINE' : 'OFFLINE'}',
                  style: TextStyle(
                    fontFamily: HaloTokens.fontBody,
                    fontSize: 13,
                    fontWeight: FontWeight.w700,
                    color: titleColor,
                  ),
                ),
                Text(
                  isOnline
                      ? 'siap menerima curhat baru'
                      : 'gak terima curhat dulu',
                  style: TextStyle(
                    fontFamily: HaloTokens.fontBody,
                    fontSize: 11,
                    color: subColor,
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class _GantiStatusButton extends ConsumerWidget {
  /// Optional label override for the offline variant (v5.jsx uses
  /// "Nyalain Status (Online)"). Defaults to "Ganti Status" for the online
  /// variant (v4.jsx).
  final String? offlineLabel;
  const _GantiStatusButton({this.offlineLabel});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final statusState = ref.watch(onlineStatusProvider);
    final isOnline = statusState is StatusLoadedData && statusState.isOnline;
    final isLoading = statusState is StatusLoadingData;

    final label = isLoading
        ? 'memproses...'
        : (isOnline ? 'Ganti Status' : (offlineLabel ?? 'Ganti Status'));

    return HaloButton(
      label: label,
      fullWidth: true,
      onPressed: isLoading
          ? null
          : () {
              final notifier = ref.read(onlineStatusProvider.notifier);
              if (isOnline) {
                notifier.toggleOffline();
              } else {
                notifier.toggleOnline();
              }
            },
    );
  }
}

class _Pengingat extends StatelessWidget {
  const _Pengingat();

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Padding(
          padding: EdgeInsets.only(bottom: 8),
          child: Text(
            'Pengingat',
            style: TextStyle(
              fontFamily: HaloTokens.fontBody,
              fontSize: 13,
              fontWeight: FontWeight.w700,
              color: HaloTokens.brandDark,
            ),
          ),
        ),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: const BoxDecoration(
            color: Color(0xFFEEE7F5),
            borderRadius: HaloRadius.md,
          ),
          child: const Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('💜', style: TextStyle(fontSize: 16)),
              SizedBox(width: 10),
              Expanded(
                child: Text.rich(
                  TextSpan(
                    style: TextStyle(
                      fontFamily: HaloTokens.fontBody,
                      fontSize: 12.5,
                      color: HaloTokens.ink,
                      height: 1.45,
                    ),
                    children: [
                      TextSpan(
                        text: 'Opening protocol: ',
                        style: TextStyle(fontWeight: FontWeight.w700),
                      ),
                      TextSpan(
                        text:
                            'selalu mulai dengan pertanyaan terbuka yang hangat ya, Bestie.',
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}