import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';
import '../../core/theme/app_theme.dart';
import '../../data/models/session.dart';
import '../../data/models/target_type.dart';
import '../../data/repositories/session_repository.dart';
import 'session_detail_screen.dart';
import 'widgets/session_list_item.dart';
import 'widgets/history_chart.dart';

class HistoryScreen extends StatefulWidget {
  final int refreshTick;

  const HistoryScreen({super.key, this.refreshTick = 0});

  @override
  State<HistoryScreen> createState() => _HistoryScreenState();
}

class _HistoryScreenState extends State<HistoryScreen> {
  List<Session> _sessions = [];
  bool _isLoading = true;
  TargetType? _filterType;
  DateTimeRange? _selectedDateRange;

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

  @override
  void didUpdateWidget(HistoryScreen oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.refreshTick != widget.refreshTick) {
      _loadSessions();
    }
  }

  Future<void> _loadSessions() async {
    if (!mounted) return;
    setState(() => _isLoading = true);

    try {
      final repository = context.read<SessionRepository>();
      final sessions = await repository.getAllSessions();

      if (mounted) {
        setState(() {
          _sessions = sessions;

          if (_filterType != null) {
            _sessions = _sessions
                .where((s) => s.analyses.any((a) => a.targetType == _filterType))
                .toList();
          }

          if (_selectedDateRange != null) {
            _sessions = _sessions.where((s) {
              final sessionDate = DateTime(
                s.createdAt.year,
                s.createdAt.month,
                s.createdAt.day,
              );
              final startDate = DateTime(
                _selectedDateRange!.start.year,
                _selectedDateRange!.start.month,
                _selectedDateRange!.start.day,
              );
              final endDate = DateTime(
                _selectedDateRange!.end.year,
                _selectedDateRange!.end.month,
                _selectedDateRange!.end.day,
              );

              return sessionDate.isAtSameMomentAs(startDate) ||
                  sessionDate.isAtSameMomentAs(endDate) ||
                  (sessionDate.isAfter(startDate) &&
                      sessionDate.isBefore(endDate));
            }).toList();
          }
          _isLoading = false;
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isLoading = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Erreur: $e'),
            backgroundColor: AppTheme.errorColor,
          ),
        );
      }
    }
  }

  Future<void> _pickDateRange() async {
    final picked = await showDateRangePicker(
      context: context,
      initialDateRange: _selectedDateRange,
      firstDate: DateTime(2020),
      lastDate: DateTime.now().add(const Duration(days: 1)),
      locale: const Locale('fr', 'FR'),
    );

    if (picked != null) {
      setState(() => _selectedDateRange = picked);
      _loadSessions();
    }
  }

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;

    return Scaffold(
      extendBody: true,
      appBar: AppBar(
        title: const Text('Carnet de Tir'),
        actions: [
          IconButton(
            icon: Icon(
              Icons.date_range_outlined,
              color: _selectedDateRange != null ? AppTheme.primaryColor : null,
            ),
            tooltip: 'Filtrer par date',
            onPressed: _pickDateRange,
          ),
          const SizedBox(width: 8),
        ],
      ),
      body: Column(
        children: [
          _buildFilterChips(isDark),
          Expanded(
            child: _isLoading
                ? const Center(child: CircularProgressIndicator())
                : _sessions.isEmpty
                    ? _buildEmptyState(isDark)
                    : _buildContent(isDark),
          ),
          if (_selectedDateRange != null) _buildActivePeriodBanner(isDark),
        ],
      ),
    );
  }

  Widget _buildFilterChips(bool isDark) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
      decoration: BoxDecoration(
        color: isDark ? AppTheme.darkBackground : AppTheme.lightBackground,
        border: Border(
          bottom: BorderSide(
            color: isDark ? AppTheme.darkBorder : AppTheme.lightBorder,
            width: 1,
          ),
        ),
      ),
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: Row(
          children: [
            _buildTypeFilterChip('Toutes les cibles', null),
            const SizedBox(width: 8),
            _buildTypeFilterChip(
              'Cibles 1-10',
              TargetType.concentric,
            ),
            const SizedBox(width: 8),
            _buildTypeFilterChip(
              'Silhouettes',
              TargetType.silhouette,
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildTypeFilterChip(String label, TargetType? type) {
    final isSelected = _filterType == type;
    return ChoiceChip(
      label: Text(label),
      selected: isSelected,
      onSelected: (selected) {
        if (selected) {
          setState(() => _filterType = type);
          _loadSessions();
        }
      },
    );
  }

  Widget _buildActivePeriodBanner(bool isDark) {
    final start = DateFormat('dd/MM/yy').format(_selectedDateRange!.start);
    final end = DateFormat('dd/MM/yy').format(_selectedDateRange!.end);

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
      decoration: BoxDecoration(
        color: isDark ? AppTheme.darkSurface : AppTheme.lightSurface,
        border: Border(
          top: BorderSide(
            color: isDark ? AppTheme.darkBorder : AppTheme.lightBorder,
          ),
        ),
      ),
      child: SafeArea(
        top: false,
        child: Row(
          children: [
            const Icon(Icons.event, size: 18, color: AppTheme.primaryColor),
            const SizedBox(width: 8),
            Text(
              'Période : $start - $end',
              style: TextStyle(
                fontSize: 13,
                fontWeight: FontWeight.w600,
                color: isDark ? AppTheme.darkTextPrimary : AppTheme.lightTextPrimary,
              ),
            ),
            const Spacer(),
            InkWell(
              onTap: () {
                setState(() => _selectedDateRange = null);
                _loadSessions();
              },
              borderRadius: BorderRadius.circular(6),
              child: Padding(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                child: Row(
                  children: [
                    Text(
                      'Effacer',
                      style: TextStyle(
                        fontSize: 12,
                        fontWeight: FontWeight.w600,
                        color: AppTheme.errorColor,
                      ),
                    ),
                    const SizedBox(width: 4),
                    const Icon(Icons.close, size: 14, color: AppTheme.errorColor),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildEmptyState(bool isDark) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              padding: const EdgeInsets.all(24),
              decoration: BoxDecoration(
                color: isDark ? AppTheme.darkSurface : AppTheme.lightSurfaceVariant,
                shape: BoxShape.circle,
                border: Border.all(
                  color: isDark ? AppTheme.darkBorder : AppTheme.lightBorder,
                ),
              ),
              child: Icon(
                Icons.history_toggle_off,
                size: 56,
                color: isDark ? AppTheme.darkTextMuted : AppTheme.lightTextMuted,
              ),
            ),
            const SizedBox(height: 18),
            Text(
              'Aucune session trouvée',
              style: TextStyle(
                fontSize: 17,
                fontWeight: FontWeight.w700,
                color: isDark ? AppTheme.darkTextPrimary : AppTheme.lightTextPrimary,
              ),
            ),
            const SizedBox(height: 6),
            Text(
              _selectedDateRange != null || _filterType != null
                  ? 'Essayez de réinitialiser vos filtres de recherche.'
                  : 'Vos sessions enregistrées apparaîtront ici.',
              textAlign: TextAlign.center,
              style: TextStyle(
                fontSize: 13,
                color: isDark ? AppTheme.darkTextSecondary : AppTheme.lightTextSecondary,
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildContent(bool isDark) {
    return RefreshIndicator(
      onRefresh: _loadSessions,
      color: AppTheme.primaryColor,
      child: CustomScrollView(
        slivers: [
          if (_sessions.length >= 2 && _selectedDateRange == null)
            SliverToBoxAdapter(
              child: Padding(
                padding: const EdgeInsets.fromLTRB(16, 16, 16, 8),
                child: HistoryChart(sessions: _sessions),
              ),
            ),
          SliverPadding(
            padding: const EdgeInsets.fromLTRB(16, 8, 16, 100),
            sliver: SliverList(
              delegate: SliverChildBuilderDelegate(
                (context, index) {
                  final session = _sessions[index];
                  return SessionListItem(
                    session: session,
                    onTap: () => _openSessionDetail(session),
                    onDelete: () => _deleteSession(session),
                  );
                },
                childCount: _sessions.length,
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _openSessionDetail(Session session) async {
    await Navigator.push(
      context,
      MaterialPageRoute(builder: (_) => SessionDetailScreen(session: session)),
    );
    _loadSessions();
  }

  Future<void> _deleteSession(Session session) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Supprimer la session'),
        content: Text(
          'Voulez-vous supprimer définitivement la session du ${DateFormat('dd/MM/yyyy à HH:mm').format(session.createdAt)} ?',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Annuler'),
          ),
          ElevatedButton(
            onPressed: () => Navigator.pop(context, true),
            style: ElevatedButton.styleFrom(
              backgroundColor: AppTheme.errorColor,
              foregroundColor: Colors.white,
            ),
            child: const Text('Supprimer'),
          ),
        ],
      ),
    );

    if (confirmed == true && mounted) {
      try {
        final repository = context.read<SessionRepository>();
        await repository.deleteSession(session.id);
        _loadSessions();
      } catch (e) {
        debugPrint('Erreur suppression: $e');
      }
    }
  }
}