import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:intl/intl.dart';
import '../../../../shared/theme/app_theme.dart';
import '../../../../shared/theme/design_system.dart';

/// Graphique en barres professionnel avec animations et interactions
class ProfessionalBarChart extends StatefulWidget {
  const ProfessionalBarChart({
    super.key,
    required this.data,
    required this.title,
    this.subtitle,
    this.showGrid = true,
    this.showValues = true,
    this.animationDuration = const Duration(milliseconds: 1500),
    this.barColor,
    this.gradientColors,
  });

  final List<BarDataPoint> data;
  final String title;
  final String? subtitle;
  final bool showGrid;
  final bool showValues;
  final Duration animationDuration;
  final Color? barColor;
  final List<Color>? gradientColors;

  @override
  State<ProfessionalBarChart> createState() => _ProfessionalBarChartState();
}

class _ProfessionalBarChartState extends State<ProfessionalBarChart>
    with SingleTickerProviderStateMixin {
  late AnimationController _animationController;
  late Animation<double> _animation;
  int _touchedIndex = -1;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      duration: widget.animationDuration,
      vsync: this,
    );
    
    _animation = Tween<double>(
      begin: 0.0,
      end: 1.0,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: DesignSystem.animationCurve,
    ));
    
    _animationController.forward();
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _buildHeader(),
        SizedBox(height: DesignSystem.spacingLg),
        Expanded(
          child: _buildChart(),
        ),
      ],
    );
  }

  Widget _buildHeader() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          widget.title,
          style: DesignSystem.titleLarge.copyWith(
            fontWeight: FontWeight.w700,
          ),
        ),
        if (widget.subtitle != null) ...[
          SizedBox(height: DesignSystem.spacingXs),
          Text(
            widget.subtitle!,
            style: DesignSystem.bodyMedium.copyWith(
              color: AppTheme.textSecondary,
            ),
          ),
        ],
      ],
    );
  }

  Widget _buildChart() {
    return AnimatedBuilder(
      animation: _animation,
      builder: (context, child) {
        return BarChart(
          BarChartData(
            alignment: BarChartAlignment.spaceAround,
            maxY: _getMaxY() * 1.2,
            barTouchData: BarTouchData(
              touchTooltipData: BarTouchTooltipData(
                tooltipBgColor: AppTheme.textPrimary.withOpacity(0.9),
                tooltipRoundedRadius: DesignSystem.radiusSm,
                tooltipPadding: EdgeInsets.all(DesignSystem.spacingSm),
                getTooltipItem: (group, groupIndex, rod, rodIndex) {
                  return BarTooltipItem(
                    '${widget.data[groupIndex].label}\n${rod.toY.toInt()}',
                    DesignSystem.labelMedium.copyWith(
                      color: Colors.white,
                      fontWeight: FontWeight.w600,
                    ),
                  );
                },
              ),
              touchCallback: (FlTouchEvent event, barTouchResponse) {
                setState(() {
                  if (!event.isInterestedForInteractions ||
                      barTouchResponse == null ||
                      barTouchResponse.spot == null) {
                    _touchedIndex = -1;
                    return;
                  }
                  _touchedIndex = barTouchResponse.spot!.touchedBarGroupIndex;
                });
              },
            ),
            titlesData: FlTitlesData(
              show: true,
              rightTitles: const AxisTitles(
                sideTitles: SideTitles(showTitles: false),
              ),
              topTitles: const AxisTitles(
                sideTitles: SideTitles(showTitles: false),
              ),
              bottomTitles: AxisTitles(
                sideTitles: SideTitles(
                  showTitles: true,
                  getTitlesWidget: _buildBottomTitles,
                  reservedSize: 42,
                ),
              ),
              leftTitles: AxisTitles(
                sideTitles: SideTitles(
                  showTitles: true,
                  getTitlesWidget: _buildLeftTitles,
                  reservedSize: 40,
                ),
              ),
            ),
            borderData: FlBorderData(show: false),
            gridData: FlGridData(
              show: widget.showGrid,
              drawVerticalLine: false,
              horizontalInterval: _getMaxY() / 5,
              getDrawingHorizontalLine: (value) {
                return FlLine(
                  color: AppTheme.borderColor.withOpacity(0.3),
                  strokeWidth: 1,
                );
              },
            ),
            barGroups: _buildBarGroups(),
          ),
        );
      },
    );
  }

  List<BarChartGroupData> _buildBarGroups() {
    return widget.data.asMap().entries.map((entry) {
      final index = entry.key;
      final data = entry.value;
      final isTouched = index == _touchedIndex;
      
      return BarChartGroupData(
        x: index,
        barRods: [
          BarChartRodData(
            toY: data.value * _animation.value,
            color: _getBarColor(index, isTouched),
            width: isTouched ? 24 : 20,
            borderRadius: BorderRadius.only(
              topLeft: Radius.circular(DesignSystem.radiusXs),
              topRight: Radius.circular(DesignSystem.radiusXs),
            ),
            gradient: widget.gradientColors != null ? LinearGradient(
              begin: Alignment.bottomCenter,
              end: Alignment.topCenter,
              colors: widget.gradientColors!,
            ) : null,
          ),
        ],
        showingTooltipIndicators: isTouched ? [0] : [],
      );
    }).toList();
  }

  Color _getBarColor(int index, bool isTouched) {
    if (widget.barColor != null) {
      return isTouched 
        ? widget.barColor!
        : widget.barColor!.withOpacity(0.8);
    }
    
    final colors = DesignSystem.chartColors;
    final color = colors[index % colors.length];
    return isTouched ? color : color.withOpacity(0.8);
  }

  Widget _buildBottomTitles(double value, TitleMeta meta) {
    if (value.toInt() >= widget.data.length) return const SizedBox.shrink();
    
    final data = widget.data[value.toInt()];
    return SideTitleWidget(
      axisSide: meta.axisSide,
      child: Padding(
        padding: EdgeInsets.only(top: DesignSystem.spacingXs),
        child: Text(
          data.label,
          style: DesignSystem.labelSmall.copyWith(
            color: AppTheme.textSecondary,
            fontWeight: FontWeight.w500,
          ),
          textAlign: TextAlign.center,
        ),
      ),
    );
  }

  Widget _buildLeftTitles(double value, TitleMeta meta) {
    return SideTitleWidget(
      axisSide: meta.axisSide,
      child: Text(
        value.toInt().toString(),
        style: DesignSystem.labelSmall.copyWith(
          color: AppTheme.textSecondary,
        ),
      ),
    );
  }

  double _getMaxY() {
    if (widget.data.isEmpty) return 10;
    return widget.data.map((e) => e.value).reduce((a, b) => a > b ? a : b);
  }
}

/// Modèle de données pour le graphique en barres
class BarDataPoint {
  const BarDataPoint({
    required this.label,
    required this.value,
    this.color,
  });

  final String label;
  final double value;
  final Color? color;
}