using ChartAndGraph;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.EventSystems;
using WI;
using TMPro;
using static ChartAndGraph.GraphChartBase;

public class UI_GraphChart : UIBase, IPointerClickHandler
{
    public GraphChart Graph;
    private UI_DateTime prf_dateTime;
    private RectTransform Content_DateTime;

    public UI_GraphChartData chartDetailData;
    private TextMeshProUGUI GraphName;

    public string graphName;
    public int targetCount;
    public int startIndex;
    public float offsetY;
    public bool isMainChart;
    public Action<string> onClickChart;

    private List<float> graphChartData = new List<float>();
    private List<string> graphDateTimeData = new List<string>();
    private Dictionary<int, Vector3> labelPos = new();

    private TextMeshProUGUI MinValue;
    private TextMeshProUGUI MaxValue;
    private TextMeshProUGUI AveValue;

    private float min;
    private float max;
    private float ave;

    public override void AfterAwake()
    {
        Graph = GetComponentInChildren<GraphChart>();
        prf_dateTime = Resources.Load<UI_DateTime>("Prefabs/UI/PRF_UI_DateTime");
        chartDetailData = GetComponentInChildren<UI_GraphChartData>(true);
    }
    public void Update()
    {
        if (!isMainChart)
            return;

        if (Input.GetMouseButtonDown(0))
        {
            if (RectTransformUtility.RectangleContainsScreenPoint(chartDetailData.rectTransform, Input.mousePosition))
            {
                return;
            }
                
            chartDetailData.SetActive(false);
        }
    }
    public void OnPointerClick(PointerEventData eventData)
    {
        if (!isMainChart)
        {
            onClickChart?.Invoke(graphName);
        }
    }

    public void OnClickItem(GraphEventArgs args)
    {
        chartDetailData.SetData(graphName, graphChartData[args.Index], graphDateTimeData[args.Index], args.Position);
    }
    public void SetChartData(string graphName, GraphChartData graphData)
    {
        this.graphName = graphName;

        SetDataValue(graphData);

        graphChartData.Clear();
        graphDateTimeData.Clear();

        Graph.DataSource.VerticalViewSize = max * 2f;
        Graph.DataSource.ClearCategory("WorkConditionsData");
        Graph.DataSource.StartBatch();
        
        for (int i = 0; i < graphData.chartData.Count; i++)
        {
            Graph.DataSource.AddPointToCategory("WorkConditionsData", i, graphData.chartData[i]);
            graphChartData.Add(graphData.chartData[i]);
            graphDateTimeData.Add(graphData.timeData[i]);
        }
        Graph.DataSource.EndBatch();

        if (isMainChart)
        {
            Graph.OnRedraw.AddListener(SetChartLabels);
        }
    }
    private void SetDataValue(GraphChartData graphData)
    {
        min = graphData.chartData.Min();
        max = graphData.chartData.Max();
        ave = graphData.chartData.Average();

        AveValue.SetText(DecimalPointCalculate(ave));

        if (isMainChart)
        {
            MinValue.SetText(DecimalPointCalculate(min));
            MaxValue.SetText(DecimalPointCalculate(max));
        }
        else
        {
            GraphName.SetText(this.graphName);
        }
    }
    private void SetChartLabels()
    {
        ClearLabels();
        this.labelPos.Clear();

        for (int i = 0; i < graphChartData.Count; i++)
        {
            Graph.PointToWorldSpace(out var worldSpace, i, graphChartData[i], "WorkConditionsData");
            this.labelPos.Add(i, worldSpace);
        }
        var labelPos = DownSampleToFixedCount(this.labelPos, targetCount, startIndex);

        foreach(var index in labelPos.Keys)
        {
            var date = Instantiate(prf_dateTime, Content_DateTime);
            date.transform.position = new Vector3(labelPos[index].x, offsetY, 0);
            date.SetDateTime(graphDateTimeData[index]);
        }
    }
    private void ClearLabels()
    {
        if (Content_DateTime.childCount <= 0)
            return;

        for (int i = 0; i < Content_DateTime.childCount; i++)
        {
            Destroy(Content_DateTime.transform.GetChild(i).gameObject);
        }
    }
    private Dictionary<int, Vector3> DownSampleToFixedCount(Dictionary<int, Vector3> labelPos, int targetCount, int startIndex)
    {
        Dictionary<int, Vector3> sampledData = new Dictionary<int, Vector3>();

        if (labelPos.Count <= targetCount || targetCount <= 0)
            return new Dictionary<int, Vector3>(labelPos);

        if (startIndex < 0) 
            startIndex = 0;

        List<int> keys = labelPos.Keys.OrderBy(k => k).ToList();
        int totalCount = keys.Count;

        if (startIndex >= totalCount)
            startIndex = totalCount - 1;

        int availableCount = totalCount - startIndex;
        double interval = (double)(availableCount - 1) / (targetCount - 1);

        for (int i = 0; i < targetCount; i++)
        {
            int indexInKeys = (int)Math.Round(startIndex + i * interval);
            if (i == targetCount - 1)
                indexInKeys = totalCount - 1;

            if (indexInKeys >= totalCount)
                indexInKeys = totalCount - 1;

            int key = keys[indexInKeys];

            if (!sampledData.ContainsKey(key))
                sampledData.Add(key, labelPos[key]);
        }
        return sampledData;
    }
    private string DecimalPointCalculate(float value)
    {
        var floatValue = Mathf.Round(value * 10f) / 10f;

        return floatValue.ToString();
    }
}