import 'dart:io';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';
import '../../core/constants/app_constants.dart';
import '../../core/theme/app_theme.dart';
import '../../data/models/session.dart';
import '../../data/models/target_analysis.dart';
import '../../data/models/target_type.dart';
import '../../data/repositories/session_repository.dart';
import '../../services/score_calculator_service.dart';
import '../../services/grouping_analyzer_service.dart';
import '../analysis/widgets/target_overlay.dart';
import '../analysis/widgets/score_card.dart';
import '../analysis/widgets/grouping_stats.dart';
import '../statistics/statistics_screen.dart';

class SessionDetailScreen extends StatefulWidget {
  final Session session;

  const SessionDetailScreen({
    super.key,
    required this.session,
  });

  @override
  State<SessionDetailScreen> createState() => _SessionDetailScreenState();
}

class _SessionDetailScreenState extends State<SessionDetailScreen> {
  int _currentTargetIndex = 0;

  @override
  Widget build(BuildContext context) {
    final scoreCalculator = context.read<ScoreCalculatorService>();
    final groupingAnalyzer = context.read<GroupingAnalyzerService>();
    
    final currentAnalysis = widget.session.analyses[_currentTargetIndex];

    final scoreResult = scoreCalculator.calculateScores(
      shots: currentAnalysis.shots,
      targetType: currentAnalysis.targetType,
      targetCenterX: currentAnalysis.targetCenterX ?? 0.5,
      targetCenterY: currentAnalysis.targetCenterY ?? 0.5,
      targetRadius: currentAnalysis.targetRadius ?? 0.4,
    );

    final groupingResult = groupingAnalyzer.analyzeGrouping(currentAnalysis.shots);

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.session.weapon),
        actions: [
          IconButton(
            icon: const Icon(Icons.analytics),
            onPressed: () => Navigator.push(
              context,
              MaterialPageRoute(
                builder: (_) => StatisticsScreen(singleSession: widget.session),
              ),
            ),
            tooltip: 'Statistiques',
          ),
          IconButton(
            icon: const Icon(Icons.delete),
            onPressed: () => _confirmDelete(context),
            tooltip: 'Supprimer',
          ),
        ],
      ),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Weapon and session overview
            _buildSessionHeader(context),

            // Target selector if multiple targets
            if (widget.session.targetCount > 1)
              _buildTargetSelector(),

            // Target image with overlay
            AspectRatio(
              aspectRatio: 1,
              child: Stack(
                fit: StackFit.expand,
                children: [
                  if (File(currentAnalysis.imagePath).existsSync())
                    Image.file(
                      File(currentAnalysis.imagePath),
                      fit: BoxFit.cover,
                    )
                  else
                    Container(
                      color: Colors.grey[200],
                      child: const Center(
                        child: Icon(Icons.image_not_supported, size: 64),
                      ),
                    ),
                  TargetOverlay(
                    shots: currentAnalysis.shots,
                    targetCenterX: currentAnalysis.targetCenterX ?? 0.5,
                    targetCenterY: currentAnalysis.targetCenterY ?? 0.5,
                    targetRadius: currentAnalysis.targetRadius ?? 0.4,
                    targetType: currentAnalysis.targetType,
                    groupingCenterX: currentAnalysis.groupingCenterX,
                    groupingCenterY: currentAnalysis.groupingCenterY,
                    groupingDiameter: currentAnalysis.groupingDiameter,
                  ),
                ],
              ),
            ),

            Padding(
              padding: const EdgeInsets.all(AppConstants.defaultPadding),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  // Analysis Info
                  _buildAnalysisInfo(context, currentAnalysis),
                  const SizedBox(height: 12),

                  // Score card for current target
                  ScoreCard(
                    totalScore: currentAnalysis.totalScore,
                    shotCount: currentAnalysis.shotCount,
                    scoreResult: scoreResult,
                    targetType: currentAnalysis.targetType,
                  ),
                  const SizedBox(height: 12),

                  // Grouping stats for current target
                  if (currentAnalysis.shotCount > 1)
                    GroupingStats(
                      groupingResult: groupingResult,
                      targetCenterX: currentAnalysis.targetCenterX ?? 0.5,
                      targetCenterY: currentAnalysis.targetCenterY ?? 0.5,
                    ),

                  // Notes for current target
                  if (currentAnalysis.notes != null && currentAnalysis.notes!.isNotEmpty) ...[
                    const SizedBox(height: 12),
                    _buildNotesCard(context, currentAnalysis.notes!),
                  ],

                  // Session notes
                  if (widget.session.notes != null && widget.session.notes!.isNotEmpty) ...[
                    const SizedBox(height: 12),
                    _buildNotesCard(context, widget.session.notes!, title: 'Notes de session'),
                  ],
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildSessionHeader(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      color: AppTheme.primaryColor.withValues(alpha: 0.1),
      child: Column(
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    DateFormat('EEEE dd MMMM yyyy', 'fr_FR').format(widget.session.createdAt),
                    style: const TextStyle(fontWeight: FontWeight.bold),
                  ),
                  Text(
                    DateFormat('HH:mm').format(widget.session.createdAt),
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                ],
              ),
              Column(
                crossAxisAlignment: CrossAxisAlignment.end,
                children: [
                  Text(
                    'Score Total: ${widget.session.totalScore}',
                    style: const TextStyle(fontWeight: FontWeight.bold, color: AppTheme.primaryColor),
                  ),
                  Text(
                    '${widget.session.totalShots} tirs au total',
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                ],
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildTargetSelector() {
    return Container(
      height: 50,
      margin: const EdgeInsets.symmetric(vertical: 8),
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        padding: const EdgeInsets.symmetric(horizontal: 16),
        itemCount: widget.session.targetCount,
        itemBuilder: (context, index) {
          final isSelected = _currentTargetIndex == index;
          return Padding(
            padding: const EdgeInsets.only(right: 8),
            child: ChoiceChip(
              label: Text('Cible ${index + 1}'),
              selected: isSelected,
              onSelected: (selected) {
                if (selected) {
                  setState(() => _currentTargetIndex = index);
                }
              },
            ),
          );
        },
      ),
    );
  }

  Widget _buildAnalysisInfo(BuildContext context, TargetAnalysis analysis) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Row(
          children: [
            Icon(
              analysis.targetType == TargetType.concentric ? Icons.track_changes : Icons.person,
              color: AppTheme.primaryColor,
            ),
            const SizedBox(width: 12),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    analysis.targetType.displayName,
                    style: const TextStyle(fontWeight: FontWeight.bold),
                  ),
                  Text(
                    'Cible ${_currentTargetIndex + 1} sur ${widget.session.targetCount}',
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildNotesCard(BuildContext context, String notes, {String title = 'Notes'}) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(AppConstants.defaultPadding),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.notes, color: AppTheme.primaryColor, size: 20),
                const SizedBox(width: 8),
                Text(
                  title,
                  style: const TextStyle(fontWeight: FontWeight.bold),
                ),
              ],
            ),
            const Divider(),
            Text(notes),
          ],
        ),
      ),
    );
  }

  Future<void> _confirmDelete(BuildContext context) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('Supprimer'),
        content: const Text('Voulez-vous vraiment supprimer cette session entière ?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Annuler'),
          ),
          TextButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text(
              'Supprimer',
              style: TextStyle(color: AppTheme.errorColor),
            ),
          ),
        ],
      ),
    );

    if (confirmed == true && context.mounted) {
      try {
        final repository = context.read<SessionRepository>();
        await repository.deleteSession(widget.session.id);
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(content: Text('Session supprimée')),
          );
          Navigator.pop(context);
        }
      } catch (e) {
        if (context.mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Erreur: $e'), backgroundColor: AppTheme.errorColor),
          );
        }
      }
    }
  }
}