import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:provider/provider.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'package:supplements/providers/supplement_provider.dart';
import 'package:supplements/services/notification_debug_store.dart';
import 'package:supplements/services/simple_notification_service.dart';

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

  @override
  State<DebugNotificationsScreen> createState() => _DebugNotificationsScreenState();
}

class _DebugNotificationsScreenState extends State<DebugNotificationsScreen> {
  bool _loading = true;
  List<PendingNotificationRequest> _pending = const [];
  List<NotificationLogEntry> _logEntries = const [];
  final Map<int, String> _supplementNameCache = {};

  @override
  void initState() {
    super.initState();
    _load();
  }

  Future<void> _load() async {
    setState(() {
      _loading = true;
    });

    // Fetch pending from plugin
    final pending = await SimpleNotificationService.instance.getPendingNotifications();

    // Fetch log from local store
    final logs = await NotificationDebugStore.instance.getAll();

    // Optionally resolve supplement names for single payloads
    await _resolveSupplementNames(pending, logs);

    if (!mounted) return;
    setState(() {
      _pending = pending;
      _logEntries = logs.reversed.toList(); // newest first
      _loading = false;
    });
  }

  Future<void> _resolveSupplementNames(
    List<PendingNotificationRequest> pending,
    List<NotificationLogEntry> logs,
  ) async {
    final ctx = context;
    if (!mounted) return;
    final provider = Provider.of<SupplementProvider>(ctx, listen: false);
    // Use existing list; attempt load if empty
    if (provider.supplements.isEmpty) {
      try {
        await provider.loadSupplements();
      } catch (_) {
        // ignore
      }
    }

    // Collect potential IDs
    final Set<int> ids = {};
    for (final p in pending) {
      final id = _extractSingleIdFromPayload(p.payload);
      if (id != null) ids.add(id);
    }
    for (final e in logs) {
      if (e.singleId != null) ids.add(e.singleId!);
    }

    // Build cache
    for (final id in ids) {
      try {
        final s = provider.supplements.firstWhere((el) => el.id == id);
        _supplementNameCache[id] = s.name;
      } catch (_) {
        // leave missing
      }
    }
  }

  int? _extractSingleIdFromPayload(String? payload) {
    if (payload == null || payload.isEmpty) return null;
    try {
      final map = jsonDecode(payload);
      if (map is Map && map['type'] == 'single') {
        final v = map['id'];
        if (v is int) return v;
      }
    } catch (_) {
      // ignore
    }
    return null;
  }

  String? _extractGroupTimeFromPayload(String? payload) {
    if (payload == null || payload.isEmpty) return null;
    try {
      final map = jsonDecode(payload);
      if (map is Map && map['type'] == 'group') {
        final v = map['time'];
        if (v is String) return v;
      }
    } catch (_) {
      // ignore
    }
    return null;
  }

  String _extractKindFromPayload(String? payload) {
    if (payload == null || payload.isEmpty) return 'unknown';
    try {
      final map = jsonDecode(payload);
      if (map is Map) {
        final meta = map['meta'];
        if (meta is Map && meta['kind'] is String) return meta['kind'] as String;
      }
    } catch (_) {}
    return 'unknown';
  }

  DateTime? _estimateScheduledAtFromPayload(String? payload) {
    // For snooze with meta.createdAt/delayMin we can compute when.
    if (payload == null || payload.isEmpty) return null;
    try {
      final map = jsonDecode(payload);
      if (map is Map) {
        final meta = map['meta'];
        if (meta is Map) {
          final kind = meta['kind'];
          if (kind == 'snooze') {
            final createdAt = meta['createdAt'];
            final delayMin = meta['delayMin'];
            if (createdAt is int && delayMin is int) {
              return DateTime.fromMillisecondsSinceEpoch(createdAt)
                  .add(Duration(minutes: delayMin));
            }
          }
        }
        // For daily group we can compute next HH:mm
        if (map['type'] == 'group' && map['time'] is String) {
          final timeKey = map['time'] as String;
          final parts = timeKey.split(':');
          if (parts.length == 2) {
            final hour = int.tryParse(parts[0]) ?? 0;
            final minute = int.tryParse(parts[1]) ?? 0;
            final now = DateTime.now();
            DateTime sched = DateTime(now.year, now.month, now.day, hour, minute);
            if (!sched.isAfter(now)) {
              sched = sched.add(const Duration(days: 1));
            }
            return sched;
          }
        }
      }
    } catch (_) {}
    return null;
  }

  Future<void> _cancelId(int id) async {
    await SimpleNotificationService.instance.cancelById(id);
    await _load();
    if (!mounted) return;
    ShadSonner.of(context).show(
      ShadToast(
        title: Text('Canceled notification $id'),
      ),
    );
  }

  Future<void> _cancelAll() async {
    await SimpleNotificationService.instance.cancelAll();
    await _load();
    if (!mounted) return;
    ShadSonner.of(context).show(
      const ShadToast(
        title: Text('Canceled all notifications'),
      ),
    );
  }

  Future<void> _clearLog() async {
    await NotificationDebugStore.instance.clear();
    await _load();
    if (!mounted) return;
    ShadSonner.of(context).show(
      const ShadToast(
        title: Text('Cleared debug log'),
      ),
    );
  }

  void _copyToClipboard(String text) {
    Clipboard.setData(ClipboardData(text: text));
    ShadSonner.of(context).show(
      const ShadToast(
        title: Text('Copied to clipboard'),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
      final pendingIds = _pending.map((e) => e.id).toSet();

    return Scaffold(
      appBar: AppBar(
        title: const Text('Debug Notifications'),
        actions: [
          IconButton(
            tooltip: 'Refresh',
            onPressed: _load,
            icon: const Icon(Icons.refresh),
          ),
          IconButton(
            tooltip: 'Cancel All',
            onPressed: _cancelAll,
            icon: const Icon(Icons.cancel_schedule_send),
          ),
          IconButton(
            tooltip: 'Clear Log',
            onPressed: _clearLog,
            icon: const Icon(Icons.delete_sweep),
          ),
        ],
      ),
      body: _loading
          ? const Center(child: CircularProgressIndicator())
          : ListView(
              padding: const EdgeInsets.all(12),
              children: [
                _buildPendingSection(),
                const SizedBox(height: 16),
                _buildTestSnoozeSection(), // Add the test snooze section
                const SizedBox(height: 16),
                _buildLogSection(pendingIds),
              ],
            ),
    );
  }

  Widget _buildPendingSection() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Pending (${_pending.length})', style: Theme.of(context).textTheme.titleMedium),
            const SizedBox(height: 8),
            if (_pending.isEmpty)
              const Text('No pending notifications'),
            for (final p in _pending) _buildPendingTile(p),
          ],
        ),
      ),
    );
  }

  Widget _buildTestSnoozeSection() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Test Snooze', style: Theme.of(context).textTheme.titleMedium),
            const SizedBox(height: 8),
            ElevatedButton(
              onPressed: () async {
                // Trigger a test snooze notification with snooze actions
                await SimpleNotificationService.instance.showInstant(
                  title: 'Test Snooze Notification',
                  body: 'This is a test notification for snooze.',
                  payload: jsonEncode({
                    "type": "single",
                    "id": 1, // Use a dummy ID for testing
                    "meta": {"kind": "daily"} // Simulate a daily notification
                  }),
                  includeSnoozeActions: true, // Include snooze actions
                  isSingle: true, // This is a single notification
                );
                if (!mounted) return;
                ShadSonner.of(context).show(
                  const ShadToast(
                    title: Text('Test snooze notification sent!'),
                  ),
                );
              },
              child: const Text('Send Test Snooze Notification'),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildPendingTile(PendingNotificationRequest p) {
    final kind = _extractKindFromPayload(p.payload);
    final singleId = _extractSingleIdFromPayload(p.payload);
    final groupTime = _extractGroupTimeFromPayload(p.payload);
    final schedAt = _estimateScheduledAtFromPayload(p.payload);

    final forStr = singleId != null
        ? (_supplementNameCache[singleId] != null
            ? '${_supplementNameCache[singleId]} (id=$singleId)'
            : 'Supplement id=$singleId')
        : (groupTime != null ? 'Time $groupTime' : 'unknown');

    // Build a clearer subtitle with scheduled time prominently displayed
    String subtitle = 'Kind: $kind • For: $forStr';
    if (schedAt != null) {
      final now = DateTime.now();
      final diff = schedAt.difference(now);
      String whenStr;
      if (diff.isNegative) {
        whenStr = 'Overdue (${schedAt.toLocal().toString().substring(0, 16)})';
      } else if (diff.inDays > 0) {
        whenStr = 'In ${diff.inDays}d ${diff.inHours % 24}h (${schedAt.toLocal().toString().substring(0, 16)})';
      } else if (diff.inHours > 0) {
        whenStr = 'In ${diff.inHours}h ${diff.inMinutes % 60}m (${schedAt.toLocal().toString().substring(11, 16)})';
      } else if (diff.inMinutes > 0) {
        whenStr = 'In ${diff.inMinutes}m (${schedAt.toLocal().toString().substring(11, 16)})';
      } else {
        whenStr = 'Very soon (${schedAt.toLocal().toString().substring(11, 16)})';
      }
      subtitle = '$subtitle\n🕒 $whenStr';
    }
    // Removed the "else" block that displayed "Schedule time unknown"

    return ListTile(
      dense: true,
      title: Text('ID ${p.id} — ${p.title ?? "(no title)"}'),
      subtitle: Text(subtitle),
      trailing: Wrap(
        spacing: 4,
        children: [
          IconButton(
            tooltip: 'Copy payload',
            icon: const Icon(Icons.copy),
            onPressed: () => _copyToClipboard(p.payload ?? ''),
          ),
          IconButton(
            tooltip: 'Cancel',
            icon: const Icon(Icons.cancel),
            onPressed: () => _cancelId(p.id),
          ),
        ],
      ),
    );
  }

  Widget _buildLogSection(Set<int> pendingIds) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('Schedule Log (${_logEntries.length})', style: Theme.of(context).textTheme.titleMedium),
            const SizedBox(height: 8),
            if (_logEntries.isEmpty)
              const Text('No log entries'),
            for (final e in _logEntries) _buildLogTile(e, pendingIds),
          ],
        ),
      ),
    );
  }

  Widget _buildLogTile(NotificationLogEntry e, Set<int> pendingIds) {
    final inQueue = pendingIds.contains(e.id);
    String forStr = 'unknown';
    if (e.type == 'single') {
      if (e.singleId != null) {
        final name = _supplementNameCache[e.singleId!];
        forStr = name != null ? '$name (id=${e.singleId})' : 'id=${e.singleId}';
      }
    } else if (e.type == 'group') {
      if (e.timeKey != null) {
        forStr = 'Time ${e.timeKey}';
      }
    }

    final scheduledAt = DateTime.fromMillisecondsSinceEpoch(e.whenEpochMs).toLocal();
    final createdAt = DateTime.fromMillisecondsSinceEpoch(e.createdAtEpochMs).toLocal();
    
    // Format times more clearly
    final scheduledStr = scheduledAt.toString().substring(0, 16);
    final createdStr = createdAt.toString().substring(0, 16);
    
    // Show status and timing info
    final statusStr = inQueue ? '🟡 Pending' : '✅ Completed/Canceled';
    
    return ListTile(
      dense: true,
      leading: Icon(inQueue ? Icons.pending : Icons.check, color: inQueue ? Colors.amber : Colors.green),
      title: Text('[${e.kind}] ${e.title} (ID ${e.id})'),
      subtitle: Text('$statusStr • Type: ${e.type} • For: $forStr\n🕒 Scheduled: $scheduledStr\n📝 Created: $createdStr'),
      trailing: Wrap(
        spacing: 4,
        children: [
          IconButton(
            tooltip: 'Copy payload',
            icon: const Icon(Icons.copy),
            onPressed: () => _copyToClipboard(e.payload),
          ),
          if (inQueue)
            IconButton(
              tooltip: 'Cancel',
              icon: const Icon(Icons.cancel),
              onPressed: () => _cancelId(e.id),
            ),
        ],
      ),
    );
  }
}