import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';

class WeightChart extends StatelessWidget {
  final List<FlSpot> dataPoints;
  final double targetWeight;
  final String title;
  final Color lineColor;
  final Color gradientStartColor;
  final Color gradientEndColor;
  final String unit;

  const WeightChart({
    super.key,
    required this.dataPoints,
    required this.targetWeight,
    this.title = 'Berat Real-time',
    this.lineColor = Colors.blue,
    this.gradientStartColor = Colors.blue,
    this.gradientEndColor = Colors.cyan,
    this.unit = 'g',
  });

  @override
  Widget build(BuildContext context) {
    // Filter data yang valid untuk ditampilkan (ganti nilai 0 dengan nilai sebelumnya)
    List<FlSpot> displayPoints = [];
    double? lastValidValue;
    
    for (var spot in dataPoints) {
      if (spot.y > 10) {
        // Data valid, gunakan nilai asli
        displayPoints.add(spot);
        lastValidValue = spot.y;
      } else if (lastValidValue != null) {
        // Data invalid (0), gunakan nilai terakhir yang valid
        displayPoints.add(FlSpot(spot.x, lastValidValue));
      }
    }
    
    // Jika masih kosong setelah filter, gunakan data asli
    if (displayPoints.isEmpty) {
      displayPoints = dataPoints;
    }
    
    // Hitung min dan max Y berdasarkan data yang akan ditampilkan
    double minY = 0;
    double maxY = 200;
    
    if (displayPoints.isNotEmpty) {
      // Cari nilai min dan max dari data yang akan ditampilkan
      double dataMin = displayPoints.map((e) => e.y).reduce((a, b) => a < b ? a : b);
      double dataMax = displayPoints.map((e) => e.y).reduce((a, b) => a > b ? a : b);
      
      // Jika ada target, sertakan dalam perhitungan
      if (targetWeight > 0) {
        dataMin = dataMin < targetWeight ? dataMin : targetWeight;
        dataMax = dataMax > targetWeight ? dataMax : targetWeight;
      }
      
      // Pastikan minY tidak negatif dan ada padding yang cukup
      double range = dataMax - dataMin;
      double padding = range > 0 ? range * 0.25 : 50; // 25% padding atau minimal 50
      
      minY = (dataMin - padding).clamp(0, double.infinity);
      maxY = dataMax + padding;
      
      // Pastikan ada range minimal 100
      if (maxY - minY < 100) {
        double center = (maxY + minY) / 2;
        minY = (center - 50).clamp(0, double.infinity);
        maxY = center + 50;
      }
      
      // Debug log
      print('📊 Weight Chart: min=$minY, max=$maxY, dataMin=$dataMin, dataMax=$dataMax, displayPoints=${displayPoints.length}/${dataPoints.length}');
      
    } else if (targetWeight > 0) {
      // Kalau belum ada data, gunakan target
      minY = 0;
      maxY = (targetWeight * 1.5).clamp(100, double.infinity);
    } else {
      // Fallback default
      minY = 0;
      maxY = 200;
    }

    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: lineColor.withOpacity(0.1),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Icon(Icons.scale, color: lineColor, size: 20),
              ),
              const SizedBox(width: 10),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      title,
                      style: const TextStyle(
                        fontSize: 14,
                        fontWeight: FontWeight.bold,
                        color: Colors.black87,
                      ),
                    ),
                    Row(
                      children: [
                        Text(
                          dataPoints.isNotEmpty 
                              ? '${dataPoints.last.y.toStringAsFixed(0)} $unit'
                              : '-- $unit',
                          style: TextStyle(
                            fontSize: 12,
                            color: Colors.grey.shade600,
                          ),
                        ),
                        const SizedBox(width: 8),
                        Icon(Icons.arrow_forward, size: 12, color: Colors.grey.shade400),
                        const SizedBox(width: 4),
                        Text(
                          '${targetWeight.toStringAsFixed(0)} $unit',
                          style: TextStyle(
                            fontSize: 12,
                            fontWeight: FontWeight.bold,
                            color: Colors.green.shade600,
                          ),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                decoration: BoxDecoration(
                  color: lineColor.withOpacity(0.1),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Row(
                  children: [
                    Icon(
                      Icons.fiber_manual_record,
                      color: lineColor,
                      size: 8,
                    ),
                    const SizedBox(width: 4),
                    const Text(
                      'LIVE',
                      style: TextStyle(
                        fontSize: 10,
                        fontWeight: FontWeight.bold,
                        color: Colors.black54,
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          SizedBox(
            height: 200, // Naik dari 180 jadi 200 biar lebih lapang
            child: dataPoints.isEmpty
                ? Center(
                    child: Text(
                      'Menunggu data...',
                      style: TextStyle(
                        fontSize: 12,
                        color: Colors.grey.shade400,
                      ),
                    ),
                  )
                : Padding(
                    padding: const EdgeInsets.only(left: 8, right: 8), // Tambah padding kiri kanan
                    child: LineChart(
                      LineChartData(
                      gridData: FlGridData(
                        show: true,
                        drawVerticalLine: false,
                        horizontalInterval: 50,
                        getDrawingHorizontalLine: (value) {
                          // Garis target lebih tebal
                          if ((value - targetWeight).abs() < 5) {
                            return FlLine(
                              color: Colors.green.shade300,
                              strokeWidth: 2,
                              dashArray: [5, 5],
                            );
                          }
                          return FlLine(
                            color: Colors.grey.shade200,
                            strokeWidth: 1,
                          );
                        },
                      ),
                      titlesData: FlTitlesData(
                        show: true,
                        rightTitles: const AxisTitles(
                          sideTitles: SideTitles(showTitles: false),
                        ),
                        topTitles: const AxisTitles(
                          sideTitles: SideTitles(showTitles: false),
                        ),
                        bottomTitles: AxisTitles(
                          sideTitles: SideTitles(
                            showTitles: true,
                            reservedSize: 30,
                            interval: 5,
                            getTitlesWidget: (value, meta) {
                              return Padding(
                                padding: const EdgeInsets.only(top: 8.0),
                                child: Text(
                                  '${value.toInt()}s',
                                  style: const TextStyle(
                                    fontSize: 10,
                                    color: Colors.grey,
                                  ),
                                ),
                              );
                            },
                          ),
                        ),
                        leftTitles: AxisTitles(
                          sideTitles: SideTitles(
                            showTitles: true,
                            interval: 50,
                            reservedSize: 50, // Turun ke 50, karena masalahnya bukan disini
                            getTitlesWidget: (value, meta) {
                              // Tandai target dengan warna hijau
                              final isTarget = (value - targetWeight).abs() < 5;
                              return Text(
                                '${value.toInt()}$unit',
                                style: TextStyle(
                                  fontSize: 10,
                                  color: isTarget ? Colors.green : Colors.grey,
                                  fontWeight: isTarget ? FontWeight.bold : FontWeight.normal,
                                ),
                              );
                            },
                          ),
                        ),
                      ),
                      borderData: FlBorderData(
                        show: true,
                        border: Border(
                          bottom: BorderSide(color: Colors.grey.shade300),
                          left: BorderSide(color: Colors.grey.shade300),
                        ),
                      ),
                      minX: displayPoints.isNotEmpty
                          ? displayPoints.first.x
                          : 0,
                      maxX: displayPoints.isNotEmpty
                          ? displayPoints.last.x
                          : 10,
                      minY: minY,
                      maxY: maxY,
                      extraLinesData: ExtraLinesData(
                        horizontalLines: [
                          HorizontalLine(
                            y: targetWeight,
                            color: Colors.green.shade400,
                            strokeWidth: 2,
                            dashArray: [8, 4],
                            label: HorizontalLineLabel(
                              show: true,
                              alignment: Alignment.topRight,
                              padding: const EdgeInsets.only(right: 5, bottom: 5),
                              style: TextStyle(
                                color: Colors.green.shade700,
                                fontSize: 10,
                                fontWeight: FontWeight.bold,
                              ),
                              labelResolver: (line) => 'Target',
                            ),
                          ),
                        ],
                      ),
                      lineBarsData: [
                        LineChartBarData(
                          spots: displayPoints,
                          isCurved: true,
                          curveSmoothness: 0.3,
                          color: lineColor,
                          barWidth: 3,
                          isStrokeCapRound: true,
                          dotData: FlDotData(
                            show: true,
                            getDotPainter: (spot, percent, barData, index) {
                              // Hanya tampilkan dot di titik terakhir
                              if (index == displayPoints.length - 1) {
                                return FlDotCirclePainter(
                                  radius: 5,
                                  color: Colors.white,
                                  strokeWidth: 3,
                                  strokeColor: lineColor,
                                );
                              }
                              return FlDotCirclePainter(
                                radius: 0,
                                color: Colors.transparent,
                              );
                            },
                          ),
                          belowBarData: BarAreaData(
                            show: true,
                            gradient: LinearGradient(
                              colors: [
                                gradientStartColor.withOpacity(0.3),
                                gradientEndColor.withOpacity(0.1),
                                Colors.transparent,
                              ],
                              begin: Alignment.topCenter,
                              end: Alignment.bottomCenter,
                            ),
                          ),
                        ),
                      ],
                      lineTouchData: LineTouchData(
                        touchTooltipData: LineTouchTooltipData(
                          getTooltipColor: (touchedSpot) => Colors.black87,
                          tooltipRoundedRadius: 8,
                          fitInsideHorizontally: true,
                          fitInsideVertically: true,
                          tooltipPadding: const EdgeInsets.all(8),
                          tooltipMargin: 8,
                          getTooltipItems: (List<LineBarSpot> touchedSpots) {
                            return touchedSpots.map((LineBarSpot touchedSpot) {
                              final remaining = touchedSpot.y - targetWeight;
                              return LineTooltipItem(
                                '${touchedSpot.y.toStringAsFixed(0)} $unit\n',
                                const TextStyle(
                                  color: Colors.white,
                                  fontWeight: FontWeight.bold,
                                  fontSize: 12,
                                ),
                                children: [
                                  TextSpan(
                                    text: remaining > 0
                                        ? 'Sisa ${remaining.toStringAsFixed(0)} $unit'
                                        : 'Target tercapai!',
                                    style: TextStyle(
                                      color: remaining > 0
                                          ? Colors.orange.shade200
                                          : Colors.green.shade200,
                                      fontSize: 10,
                                    ),
                                  ),
                                ],
                              );
                            }).toList();
                          },
                        ),
                        handleBuiltInTouches: true,
                      ),
                    ),
                  ),
                ),
          ),
        ],
      ),
    );
  }
}