import 'package:flutter/material.dart';
import 'package:fl_chart/fl_chart.dart';
import 'package:vbvs_app/common/util/FitTool.dart';
import 'dart:math';

import 'package:vbvs_app/common/util/MyUtils.dart';

class TimeSeriesChart extends StatelessWidget {
  final int startTime;
  final int endTime;
  final double yMin;
  final double yMax;
  final List<TimeSeriesPoint> dataPoints;

  TimeSeriesChart({
    required this.startTime,
    required this.endTime,
    required this.yMin,
    required this.yMax,
    required this.dataPoints,
  });

  @override
  Widget build(BuildContext context) {
    final midValue = (yMax + yMin) / 2;
    final xLabels = _generateXLabels();

    // Prepare spots and segments
    List<FlSpot> spots = [];
    List<Color> lineColors = [];

    for (int i = 0; i < dataPoints.length; i++) {
      final point = dataPoints[i];
      final xValue = _convertTimeToXValue(point.timestamp);
      final yValue = point.value;

      spots.add(FlSpot(xValue, yValue));
      if (yValue >= yMin && yValue <= yMax) {
        lineColors.add(Colors.green); // Color for points within range
      } else {
        lineColors.add(Colors.red); // Color for points outside range
      }
    }

    return AspectRatio(
      aspectRatio: 2,
      child: LineChart(
        LineChartData(
          lineTouchData: LineTouchData(
            touchTooltipData: LineTouchTooltipData(
              getTooltipItems: (List<LineBarSpot> touchedSpots) {
                return touchedSpots.map((spot) {
                  final time = DateTime.fromMillisecondsSinceEpoch(
                    _convertXValueToTime(spot.x),
                  );
                  return LineTooltipItem(
                    '${time.hour.toString().padLeft(2, '0')}:${time.minute.toString().padLeft(2, '0')}\n${spot.y.toStringAsFixed(0)}',
                    const TextStyle(color: Colors.black),
                  );
                }).toList();
              },
            ),
          ),
          gridData: FlGridData(
            show: true,
            drawVerticalLine: false,
            getDrawingHorizontalLine: (value) {
              if (value == 0) {
                return FlLine(
                  color: themeController.currentColor.sc4,
                  strokeWidth: 1,
                );
              } else if (value == yMin) {
                return FlLine(
                  color: themeController.currentColor.sc9,
                  strokeWidth: 1,
                  dashArray: [5, 5],
                );
              } else if (value == yMax) {
                return FlLine(
                  color: themeController.currentColor.sc9,
                  strokeWidth: 1,
                  dashArray: [5, 5],
                );
              } else if (value == midValue) {
                return FlLine(
                  color: themeController.currentColor.sc4,
                  strokeWidth: 1,
                  dashArray: [5, 5],
                );
              }
              return FlLine(
                color: Colors.grey.withOpacity(0.1),
                strokeWidth: 1,
              );
            },
          ),
          titlesData: FlTitlesData(
            show: true,
            rightTitles: AxisTitles(
              sideTitles: SideTitles(showTitles: false),
            ),
            topTitles: AxisTitles(
              sideTitles: SideTitles(showTitles: false),
            ),
            bottomTitles: AxisTitles(
              sideTitles: SideTitles(
                showTitles: true,
                reservedSize: 30,
                getTitlesWidget: (value, meta) {
                  final index = value.toInt();
                  if (index >= 0 && index < xLabels.length) {
                    return Padding(
                      padding: const EdgeInsets.only(top: 8.0),
                      child: Text(
                        xLabels[index].label,
                        style: TextStyle(
                          fontSize: 10,
                          color: Colors.grey,
                        ),
                      ),
                    );
                  }
                  return const Text('');
                },
              ),
            ),
            leftTitles: AxisTitles(
              sideTitles: SideTitles(
                showTitles: true,
                getTitlesWidget: (value, meta) {
                  if (value == 0) {
                    return Padding(
                      padding: EdgeInsets.only(right: 14.rpx),
                      child: Text(
                        value.toStringAsFixed(0),
                        style: TextStyle(
                          fontSize: 18.rpx,
                          color: themeController.currentColor.sc4,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        textAlign: TextAlign.right,
                      ),
                    );
                  } else if (value == yMin) {
                    return Padding(
                      padding: EdgeInsets.only(right: 14.rpx),
                      child: Text(
                        yMin.toStringAsFixed(0),
                        style: TextStyle(
                          fontSize: 18.rpx,
                          color: themeController.currentColor.sc4,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        textAlign: TextAlign.right,
                      ),
                    );
                  } else if (value == midValue) {
                    return Padding(
                      padding: EdgeInsets.only(right: 14.rpx),
                      child: Text(
                        midValue.toStringAsFixed(0),
                        style: TextStyle(
                          fontSize: 18.rpx,
                          color: themeController.currentColor.sc4,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        textAlign: TextAlign.right,
                      ),
                    );
                  } else if (value == yMax) {
                    return Padding(
                      padding: EdgeInsets.only(right: 14.rpx),
                      child: Text(
                        yMax.toStringAsFixed(0),
                        style: TextStyle(
                          fontSize: 18.rpx,
                          color: themeController.currentColor.sc4,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        textAlign: TextAlign.right,
                      ),
                    );
                  }
                  return const Text('');
                },
                reservedSize: 40,
              ),
            ),
          ),
          borderData: FlBorderData(
            show: false,
            border: Border.all(color: Colors.grey.withOpacity(0.3)),
          ),
          minX: 0,
          maxX: xLabels.length - 1,
          minY: min(0, yMin) - (yMax - yMin) * 0.2,
          maxY: yMax + (yMax - yMin) * 0.2,
          lineBarsData: [
            LineChartBarData(
              spots: spots,
              isCurved: false,
              color: themeController.currentColor.sc2,
              barWidth: 2,
              isStrokeCapRound: true,
              dotData: FlDotData(show: false), // Disable dots
              belowBarData: BarAreaData(show: false),
            ),
          ],
        ),
      ),
    );
  }

  List<XLabel> _generateXLabels() {
    final labels = <XLabel>[];
    final startDate = DateTime.fromMillisecondsSinceEpoch(startTime);
    final endDate = DateTime.fromMillisecondsSinceEpoch(endTime);

    labels.add(XLabel(
      time: startTime,
      label:
          '${startDate.hour.toString().padLeft(2, '0')}:${startDate.minute.toString().padLeft(2, '0')}',
    ));

    DateTime current = DateTime(
      startDate.year,
      startDate.month,
      startDate.day,
      startDate.hour + 1,
    );

    while (current.isBefore(endDate)) {
      labels.add(XLabel(
        time: current.millisecondsSinceEpoch,
        label: current.hour.toString(),
      ));
      current = current.add(Duration(hours: 1));
    }

    labels.add(XLabel(
      time: endTime,
      label:
          '${endDate.hour.toString().padLeft(2, '0')}:${endDate.minute.toString().padLeft(2, '0')}',
    ));

    return labels;
  }

  double _convertTimeToXValue(int timestamp) {
    final totalDuration = endTime - startTime;
    final pointDuration = timestamp - startTime;
    final xLabels = _generateXLabels();
    return (pointDuration / totalDuration) * (xLabels.length - 1);
  }

  int _convertXValueToTime(double xValue) {
    final xLabels = _generateXLabels();
    final totalDuration = endTime - startTime;
    final ratio = xValue / (xLabels.length - 1);
    return startTime + (totalDuration * ratio).round();
  }
}

class TimeSeriesPoint {
  final int timestamp;
  final double value;

  TimeSeriesPoint(this.timestamp, this.value);
}

class XLabel {
  final int time;
  final String label;

  XLabel({required this.time, required this.label});
}