using UnityEngine;
using EasyChart;
using System.Collections.Generic;

/// <summary>
/// 判定偏移直方图：用 EasyChart 可视化判定偏移分布。
/// 从 ScoreManager.OffsetSamples 读取数据并绘制直方图。
/// 供后续快速接入（需你指定在何处显示此组件）。
/// </summary>
[RequireComponent(typeof(ChartElement))]
public class JudgeOffsetHistogram : MonoBehaviour
{
    [Header("数据源")]
    [SerializeField] private ScoreManager scoreManager;

    [Header("直方图配置")]
    [SerializeField] private int binCount = 20; // 分箱数（横轴分段）
    [SerializeField] private float rangeMin = -200f; // ms
    [SerializeField] private float rangeMax = 200f;  // ms
    [SerializeField] private Color barColor = new Color(0.2f, 0.6f, 1f, 0.8f);

    [Header("标签")]
    [SerializeField] private string chartTitle = "Judge Offset Distribution";
    [SerializeField] private string xAxisLabel = "Offset (ms)";
    [SerializeField] private string yAxisLabel = "Count";

    private ChartElement chartElement;
    private ChartData chartData;

    private void Awake()
    {
        chartElement = GetComponent<ChartElement>();
        if (chartElement == null)
        {
            Debug.LogError("[JudgeOffsetHistogram] ChartElement component not found!");
            return;
        }

        // 自动查找 ScoreManager（如果未手动赋值）
        if (scoreManager == null)
        {
            scoreManager = FindObjectOfType<ScoreManager>();
        }
    }

    /// <summary>
    /// 刷新直方图：从 ScoreManager.offsetSamples 读取数据并绘制。
    /// 在结算页显示时调用。
    /// </summary>
    public void RefreshHistogram()
    {
        if (scoreManager == null)
        {
            Debug.LogWarning("[JudgeOffsetHistogram] ScoreManager not assigned.");
            return;
        }

        // 读取偏移样本（ms）
        IReadOnlyList<float> samples = scoreManager.OffsetSamples;
        if (samples == null || samples.Count == 0)
        {
            Debug.LogWarning("[JudgeOffsetHistogram] No offset samples available.");
            return;
        }

        // 分箱统计
        int[] bins = new int[binCount];
        float binWidth = (rangeMax - rangeMin) / binCount;

        foreach (float offset in samples)
        {
            if (offset < rangeMin || offset >= rangeMax) continue; // 超出范围忽略

            int binIndex = Mathf.FloorToInt((offset - rangeMin) / binWidth);
            binIndex = Mathf.Clamp(binIndex, 0, binCount - 1);
            bins[binIndex]++;
        }

        // 构建 EasyChart ChartData
        BuildChartData(bins, binWidth);

        // 应用到 ChartElement
        if (chartElement != null && chartData != null)
        {
            chartElement.SetData(chartData);
            Debug.Log($"[JudgeOffsetHistogram] Refreshed with {samples.Count} samples, {binCount} bins.");
        }
    }

    private void BuildChartData(int[] bins, float binWidth)
    {
        chartData = new ChartData();

        // 配置坐标系为笛卡尔2D
        chartData.CoordinateSystem = CoordinateSystemType.Cartesian2D;
        chartData.XAxisId = AxisId.XBottom;
        chartData.YAxisId = AxisId.YLeft;

        // X 轴配置（类目轴，显示偏移区间）
        var xAxis = new AxisConfig
        {
            id = AxisId.XBottom,
            axisType = AxisType.Category,
            labels = new List<string>()
        };
        for (int i = 0; i < binCount; i++)
        {
            float binCenter = rangeMin + (i + 0.5f) * binWidth;
            xAxis.labels.Add($"{binCenter:F0}");
        }

        // Y 轴配置（数值轴，显示计数）
        var yAxis = new AxisConfig
        {
            id = AxisId.YLeft,
            axisType = AxisType.Value,
            minValue = 0f,
            autoRangeMin = true,
            autoRangeMax = true
        };

        chartData.Axes = new List<AxisConfig> { xAxis, yAxis };

        // 创建柱状图系列
        var serie = new Serie
        {
            name = chartTitle,
            type = SerieType.Bar,
            seriesData = new List<SeriesData>()
        };

        // 填充数据点
        for (int i = 0; i < binCount; i++)
        {
            serie.seriesData.Add(new SeriesData
            {
                x = i,
                value = bins[i]
            });
        }

        // 配置柱状图样式（可选）
        var barSettings = new BarSettings();
        if (barSettings.textureFill == null)
        {
            barSettings.textureFill = new TextureFillSettings { color = barColor };
        }
        else
        {
            barSettings.textureFill.color = barColor;
        }
        serie.settings = barSettings;

        chartData.Series = new List<Serie> { serie };
    }

    /// <summary>
    /// 清空直方图。
    /// </summary>
    public void ClearHistogram()
    {
        if (chartElement != null)
        {
            chartElement.SetData(null);
        }
    }

    // 供 Inspector 测试用的按钮方法
    [ContextMenu("Test Refresh Histogram")]
    private void TestRefresh()
    {
        RefreshHistogram();
    }
}