/// Graphique d'évolution des scores.
///
/// Affiche un graphique linéaire montrant l'évolution des scores
/// sur les 10 dernières sessions. Utilise fl_chart pour le rendu.
library;

import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:intl/intl.dart';
import '../../../core/constants/app_constants.dart';
import '../../../core/theme/app_theme.dart';
import '../../../data/models/session.dart';

class HistoryChart extends StatelessWidget {
  final List<Session> sessions;

  const HistoryChart({
    super.key,
    required this.sessions,
  });

  @override
  Widget build(BuildContext context) {
    if (sessions.length < 2) {
      return const SizedBox.shrink();
    }

    // Sort sessions by date and take last 10
    final sortedSessions = List<Session>.from(sessions)
      ..sort((a, b) => a.createdAt.compareTo(b.createdAt));
    final displaySessions = sortedSessions.length > 10
        ? sortedSessions.sublist(sortedSessions.length - 10)
        : sortedSessions;

    return Card(
      child: Padding(
        padding: const EdgeInsets.all(AppConstants.defaultPadding),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                const Icon(Icons.show_chart, color: AppTheme.primaryColor),
                const SizedBox(width: 8),
                Text(
                  'Evolution des scores',
                  style: Theme.of(context).textTheme.titleMedium?.copyWith(
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ],
            ),
            const SizedBox(height: 16),
            SizedBox(
              height: 200,
              child: LineChart(
                LineChartData(
                  gridData: FlGridData(
                    show: true,
                    drawVerticalLine: false,
                    horizontalInterval: 20,
                    getDrawingHorizontalLine: (value) {
                      return FlLine(
                        color: Colors.grey[300],
                        strokeWidth: 1,
                      );
                    },
                  ),
                  titlesData: FlTitlesData(
                    show: true,
                    bottomTitles: AxisTitles(
                      sideTitles: SideTitles(
                        showTitles: true,
                        reservedSize: 30,
                        interval: 1,
                        getTitlesWidget: (value, meta) {
                          final index = value.toInt();
                          if (index < 0 || index >= displaySessions.length) {
                            return const SizedBox.shrink();
                          }
                          return Padding(
                            padding: const EdgeInsets.only(top: 8),
                            child: Text(
                              DateFormat('dd/MM').format(displaySessions[index].createdAt),
                              style: const TextStyle(fontSize: 10),
                            ),
                          );
                        },
                      ),
                    ),
                    leftTitles: AxisTitles(
                      sideTitles: SideTitles(
                        showTitles: true,
                        reservedSize: 40,
                        interval: 20,
                        getTitlesWidget: (value, meta) {
                          return Text(
                            value.toInt().toString(),
                            style: const TextStyle(fontSize: 10),
                          );
                        },
                      ),
                    ),
                    topTitles: const AxisTitles(
                      sideTitles: SideTitles(showTitles: false),
                    ),
                    rightTitles: const AxisTitles(
                      sideTitles: SideTitles(showTitles: false),
                    ),
                  ),
                  borderData: FlBorderData(
                    show: true,
                    border: Border(
                      bottom: BorderSide(color: Colors.grey[300]!),
                      left: BorderSide(color: Colors.grey[300]!),
                    ),
                  ),
                  minX: 0,
                  maxX: (displaySessions.length - 1).toDouble(),
                  minY: 0,
                  maxY: _getMaxY(displaySessions),
                  lineBarsData: [
                    // Score line
                    LineChartBarData(
                      spots: displaySessions.asMap().entries.map((entry) {
                        return FlSpot(
                          entry.key.toDouble(),
                          entry.value.totalScore.toDouble(),
                        );
                      }).toList(),
                      isCurved: true,
                      color: AppTheme.primaryColor,
                      barWidth: 3,
                      isStrokeCapRound: true,
                      dotData: FlDotData(
                        show: true,
                        getDotPainter: (spot, percent, barData, index) {
                          return FlDotCirclePainter(
                            radius: 4,
                            color: AppTheme.primaryColor,
                            strokeWidth: 2,
                            strokeColor: Colors.white,
                          );
                        },
                      ),
                      belowBarData: BarAreaData(
                        show: true,
                        color: AppTheme.primaryColor.withValues(alpha: 0.1),
                      ),
                    ),
                  ],
                  lineTouchData: LineTouchData(
                    touchTooltipData: LineTouchTooltipData(
                      getTooltipItems: (touchedSpots) {
                        return touchedSpots.map((spot) {
                          final session = displaySessions[spot.x.toInt()];
                          return LineTooltipItem(
                            'Score: ${session.totalScore}\n${session.shotCount} tirs',
                            const TextStyle(
                              color: Colors.white,
                              fontWeight: FontWeight.bold,
                            ),
                          );
                        }).toList();
                      },
                    ),
                  ),
                ),
              ),
            ),
            const SizedBox(height: 8),
            _buildLegend(context, displaySessions),
          ],
        ),
      ),
    );
  }

  double _getMaxY(List<Session> sessions) {
    double maxScore = 0;
    for (final session in sessions) {
      if (session.totalScore > maxScore) {
        maxScore = session.totalScore.toDouble();
      }
    }
    return (maxScore * 1.2).ceilToDouble();
  }

  Widget _buildLegend(BuildContext context, List<Session> displaySessions) {
    final avgScore = displaySessions.fold<int>(0, (sum, s) => sum + s.totalScore) /
        displaySessions.length;

    final trend = displaySessions.length >= 2
        ? displaySessions.last.totalScore - displaySessions.first.totalScore
        : 0;

    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: [
        _buildLegendItem(
          context,
          'Moyenne',
          avgScore.toStringAsFixed(1),
          Icons.analytics,
          AppTheme.primaryColor,
        ),
        _buildLegendItem(
          context,
          'Tendance',
          trend >= 0 ? '+$trend' : '$trend',
          trend >= 0 ? Icons.trending_up : Icons.trending_down,
          trend >= 0 ? AppTheme.successColor : AppTheme.errorColor,
        ),
        _buildLegendItem(
          context,
          'Sessions',
          '${displaySessions.length}',
          Icons.list,
          Colors.grey,
        ),
      ],
    );
  }

  Widget _buildLegendItem(
    BuildContext context,
    String label,
    String value,
    IconData icon,
    Color color,
  ) {
    return Column(
      children: [
        Icon(icon, size: 16, color: color),
        const SizedBox(height: 4),
        Text(
          value,
          style: TextStyle(
            fontWeight: FontWeight.bold,
            color: color,
          ),
        ),
        Text(
          label,
          style: Theme.of(context).textTheme.bodySmall,
        ),
      ],
    );
  }
}