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';

/// Bestie Home (mitra). Mirrors `figma-bestie/project/screens/v4.jsx::BestieHome`
/// + `v5.jsx::BestieHomeOffline`. Bottom nav (BestieTabBar) is deferred until
/// the Profil + Chat tabs have screen implementations.
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;

    // Load pending requests if mitra is already 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: SingleChildScrollView(
          padding: const EdgeInsets.fromLTRB(20, 20, 20, 28),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              _Header(displayName: displayName, isOnline: isOnline),
              const SizedBox(height: 18),
              const _TilesGrid(),
              const SizedBox(height: 14),
              _StatusCard(isOnline: isOnline),
              const SizedBox(height: 10),
              const _GantiStatusButton(),
              const SizedBox(height: 22),
              const _Pengingat(),
              const SizedBox(height: 16),
              // Functional shortcuts (no figma equivalent — kept until the
              // Chat tab is built so the user can still reach sessions /
              // history pages from home).
              const _ShortcutTile(
                icon: Icons.chat_bubble_outline,
                title: 'Sesi Aktif',
                route: '/sessions',
              ),
              const SizedBox(height: 8),
              const _ShortcutTile(
                icon: Icons.history,
                title: 'Riwayat Chat',
                route: '/chat/history',
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class _Header extends ConsumerWidget {
  final String displayName;
  final bool isOnline;
  const _Header({required this.displayName, required this.isOnline});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final greetingSuffix = isOnline ? '🌸' : '🌙';
    return Row(
      children: [
        Expanded(
          child: 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,
                ),
              ),
            ],
          ),
        ),
        IconButton(
          icon: const Icon(Icons.more_horiz, color: HaloTokens.ink),
          style: IconButton.styleFrom(
            backgroundColor: HaloTokens.surface,
            shape: const CircleBorder(),
          ),
          onPressed: () => _showMenu(context, ref),
        ),
      ],
    );
  }

  Future<void> _showMenu(BuildContext context, WidgetRef ref) {
    return showModalBottomSheet<void>(
      context: context,
      builder: (ctx) => SafeArea(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            ListTile(
              leading: const Icon(Icons.logout, color: HaloTokens.danger),
              title: const Text(
                'Keluar',
                style: TextStyle(
                  fontFamily: HaloTokens.fontBody,
                  fontWeight: FontWeight.w600,
                ),
              ),
              onTap: () async {
                Navigator.of(ctx).pop();
                await ref.read(mitraAuthProvider.notifier).logout();
              },
            ),
          ],
        ),
      ),
    );
  }
}

class _TilesGrid extends ConsumerWidget {
  const _TilesGrid();

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

    return Row(
      children: [
        Expanded(
          child: _DarkTile(
            icon: '📨',
            label: 'Undangan',
            subtitle:
                undanganCount > 0 ? 'Menunggu: $undanganCount' : 'Belum ada',
            badgeCount: undanganCount,
            onTap: () => context.push('/chat/requests/history'),
          ),
        ),
        const SizedBox(width: 10),
        // Perpanjang tile — backend wiring (extension request count) isn't
        // exposed to the home yet, so render the static "Belum ada" state to
        // match the figma. Wire to the same notifier once an extension-count
        // provider exists.
        const Expanded(
          child: _DarkTile(
            icon: '⚡',
            label: 'Perpanjang',
            subtitle: 'Belum ada',
            badgeCount: 0,
            onTap: null,
          ),
        ),
      ],
    );
  }
}

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: BoxDecoration(
        color: const 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 {
  const _GantiStatusButton();

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

    return HaloButton(
      label: isLoading ? 'memproses...' : 'Ganti Status',
      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: BoxDecoration(
            color: const 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.',
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

class _ShortcutTile extends StatelessWidget {
  final IconData icon;
  final String title;
  final String route;
  const _ShortcutTile({
    required this.icon,
    required this.title,
    required this.route,
  });

  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.transparent,
      child: InkWell(
        borderRadius: HaloRadius.lg,
        onTap: () => context.push(route),
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
          decoration: BoxDecoration(
            color: HaloTokens.surface,
            borderRadius: HaloRadius.lg,
            border: Border.all(color: HaloTokens.border),
          ),
          child: Row(
            children: [
              Icon(icon, color: HaloTokens.brandDark, size: 20),
              const SizedBox(width: 12),
              Expanded(
                child: Text(
                  title,
                  style: const TextStyle(
                    fontFamily: HaloTokens.fontBody,
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: HaloTokens.ink,
                  ),
                ),
              ),
              const Icon(Icons.chevron_right,
                  color: HaloTokens.inkMuted, size: 20),
            ],
          ),
        ),
      ),
    );
  }
}