/******************************************/
/*                                        */
/*     Copyright (c) 2018 monitor1394     */
/*     https://github.com/monitor1394     */
/*                                        */
/******************************************/
using UnityEngine;
using UnityEngine.UI;

namespace XCharts
{
    internal static class SerieHelper
    {
        internal static Color GetItemBackgroundColor(Serie serie, SerieData serieData, ThemeInfo theme, int index, bool highlight, bool useDefault = true)
        {
            var color = Color.clear;
            if (highlight)
            {
                var itemStyleEmphasis = GetItemStyleEmphasis(serie, serieData);
                if (itemStyleEmphasis != null && !ChartHelper.IsClearColor(itemStyleEmphasis.backgroundColor))
                {
                    color = itemStyleEmphasis.backgroundColor;
                    color.a *= itemStyleEmphasis.opacity;
                    return color;
                }
            }
            var itemStyle = GetItemStyle(serie, serieData);
            if (!ChartHelper.IsClearColor(itemStyle.backgroundColor))
            {
                color = itemStyle.backgroundColor;
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
            else if (useDefault)
            {
                color = (Color)theme.GetColor(index);
                if (highlight) color *= color;
                color.a = 0.2f;
                return color;
            }
            return color;
        }

        internal static Color GetItemColor(Serie serie, SerieData serieData, ThemeInfo theme, int index, bool highlight)
        {
            if (highlight)
            {
                var itemStyleEmphasis = GetItemStyleEmphasis(serie, serieData);
                if (itemStyleEmphasis != null && !ChartHelper.IsClearColor(itemStyleEmphasis.color))
                {
                    var color = itemStyleEmphasis.color;
                    color.a *= itemStyleEmphasis.opacity;
                    return color;
                }
            }
            var itemStyle = GetItemStyle(serie, serieData);
            if (!ChartHelper.IsClearColor(itemStyle.color))
            {
                var color = itemStyle.color;
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
            else
            {
                var color = (Color)theme.GetColor(index);
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
        }

        internal static Color GetItemToColor(Serie serie, SerieData serieData, ThemeInfo theme, int index, bool highlight)
        {
            if (highlight)
            {
                var itemStyleEmphasis = GetItemStyleEmphasis(serie, serieData);
                if (itemStyleEmphasis != null && !ChartHelper.IsClearColor(itemStyleEmphasis.toColor))
                {
                    var color = itemStyleEmphasis.toColor;
                    color.a *= itemStyleEmphasis.opacity;
                    return color;
                }
            }
            var itemStyle = GetItemStyle(serie, serieData, highlight);
            if (itemStyle == null) itemStyle = serieData.itemStyle;
            if (!ChartHelper.IsClearColor(itemStyle.toColor))
            {
                var color = itemStyle.toColor;
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
            if (!ChartHelper.IsClearColor(itemStyle.color))
            {
                var color = itemStyle.color;
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
            else
            {
                var color = (Color)theme.GetColor(index);
                if (highlight) color *= color;
                color.a *= itemStyle.opacity;
                return color;
            }
        }

        public static bool IsDownPoint(Serie serie, int index)
        {
            var dataPoints = serie.dataPoints;
            if (dataPoints.Count < 2) return false;
            else if (index > 0 && index < dataPoints.Count - 1)
            {
                var lp = dataPoints[index - 1];
                var np = dataPoints[index + 1];
                var cp = dataPoints[index];
                var dot = Vector3.Cross(np - lp, cp - np);
                return dot.z < 0;
            }
            else if (index == 0)
            {
                return dataPoints[0].y < dataPoints[1].y;
            }
            else if (index == dataPoints.Count - 1)
            {
                return dataPoints[index].y < dataPoints[index - 1].y;
            }
            else
            {
                return false;
            }
        }

        public static ItemStyle GetItemStyle(Serie serie, SerieData serieData, bool highlight = false)
        {
            if (highlight)
            {
                var style = GetItemStyleEmphasis(serie, serieData);
                if (style == null) return GetItemStyle(serie, serieData, false);
                else return style;
            }
            else if (serie.IsPerformanceMode()) return serie.itemStyle;
            else if (serieData != null && serieData.enableItemStyle) return serieData.itemStyle;
            else return serie.itemStyle;
        }

        public static ItemStyle GetItemStyleEmphasis(Serie serie, SerieData serieData)
        {
            if (!serie.IsPerformanceMode() && serieData != null && serieData.enableEmphasis && serieData.emphasis.show)
                return serieData.emphasis.itemStyle;
            else if (serie.emphasis.show) return serie.emphasis.itemStyle;
            else return null;
        }

        public static SerieLabel GetSerieLabel(Serie serie, SerieData serieData, bool highlight = false)
        {
            if (highlight)
            {
                if (!serie.IsPerformanceMode() && serieData.enableEmphasis && serieData.emphasis.show)
                    return serieData.emphasis.label;
                else if (serie.emphasis.show) return serie.emphasis.label;
                else return serie.label;
            }
            else
            {
                if (!serie.IsPerformanceMode() && serieData.enableLabel) return serieData.label;
                else return serie.label;
            }
        }

        public static Color GetAreaColor(Serie serie, ThemeInfo theme, int index, bool highlight)
        {
            var areaStyle = serie.areaStyle;
            var color = !ChartHelper.IsClearColor(areaStyle.color) ? areaStyle.color : (Color)theme.GetColor(index);
            if (highlight)
            {
                if (!ChartHelper.IsClearColor(areaStyle.highlightColor)) color = areaStyle.highlightColor;
                else color *= color;
            }
            color.a *= areaStyle.opacity;
            return color;
        }

        public static Color GetAreaToColor(Serie serie, ThemeInfo theme, int index, bool highlight)
        {
            var areaStyle = serie.areaStyle;
            if (!ChartHelper.IsClearColor(areaStyle.toColor))
            {
                var color = areaStyle.toColor;
                if (highlight)
                {
                    if (!ChartHelper.IsClearColor(areaStyle.highlightToColor)) color = areaStyle.highlightToColor;
                    else color *= color;
                }
                color.a *= areaStyle.opacity;
                return color;
            }
            else
            {
                return GetAreaColor(serie, theme, index, highlight);
            }
        }

        public static Color GetLineColor(Serie serie, ThemeInfo theme, int index, bool highlight)
        {
            var color = Color.clear;
            if (highlight)
            {
                var itemStyleEmphasis = GetItemStyleEmphasis(serie, null);
                if (itemStyleEmphasis != null && !ChartHelper.IsClearColor(itemStyleEmphasis.color))
                {
                    color = itemStyleEmphasis.color;
                    color.a *= itemStyleEmphasis.opacity;
                    return color;
                }
            }
            if (!ChartHelper.IsClearColor(serie.lineStyle.color)) color = serie.lineStyle.GetColor();
            else if (!ChartHelper.IsClearColor(serie.itemStyle.color)) color = serie.itemStyle.GetColor();
            if (ChartHelper.IsClearColor(color))
            {
                color = (Color)theme.GetColor(index);
                color.a = serie.lineStyle.opacity;
            }
            if (highlight) color *= color;
            return color;
        }

        public static float GetSymbolBorder(Serie serie, SerieData serieData, bool highlight, bool useLineWidth = true)
        {
            var itemStyle = GetItemStyle(serie, serieData, highlight);
            if (itemStyle != null && itemStyle.borderWidth != 0) return itemStyle.borderWidth;
            else if (serie.lineStyle.width != 0 && useLineWidth) return serie.lineStyle.width;
            else return 0;
        }

        public static float[] GetSymbolCornerRadius(Serie serie, SerieData serieData, bool highlight)
        {
            var itemStyle = GetItemStyle(serie, serieData, highlight);
            if (itemStyle != null) return itemStyle.cornerRadius;
            else return null;
        }

        /// <summary>
        /// 更新运行时中心点和半径
        /// </summary>
        /// <param name="chartWidth"></param>
        /// <param name="chartHeight"></param>
        internal static void UpdateCenter(Serie serie, Vector3 chartPosition, float chartWidth, float chartHeight)
        {
            if (serie.center.Length < 2) return;
            var centerX = serie.center[0] <= 1 ? chartWidth * serie.center[0] : serie.center[0];
            var centerY = serie.center[1] <= 1 ? chartHeight * serie.center[1] : serie.center[1];
            serie.runtimeCenterPos = chartPosition + new Vector3(centerX, centerY);
            var minWidth = Mathf.Min(chartWidth, chartHeight);
            serie.runtimeInsideRadius = serie.radius[0] <= 1 ? minWidth * serie.radius[0] : serie.radius[0];
            serie.runtimeOutsideRadius = serie.radius[1] <= 1 ? minWidth * serie.radius[1] : serie.radius[1];
        }

        /// <summary>
        /// 获得指定维数的最大最小值
        /// </summary>
        /// <param name="dimension"></param>
        /// <param name="dataZoom"></param>
        /// <returns></returns>
        public static void GetDimensionMinMaxData(Serie serie, int dimension, int ceilRate = 0, DataZoom dataZoom = null)
        {
            var dataList = serie.GetDataList(dataZoom);
            float max = float.MinValue;
            float min = float.MaxValue;
            for (int i = 0; i < dataList.Count; i++)
            {
                var serieData = dataList[i];
                if (serieData.show && serieData.data.Count > dimension)
                {
                    var value = serieData.data[dimension];
                    if (value > max) max = value;
                    if (value < min) min = value;
                }
            }
            serie.runtimeDataMin = ChartHelper.GetMinDivisibleValue(min, ceilRate);
            serie.runtimeDataMax = ChartHelper.GetMaxDivisibleValue(max, ceilRate);
        }

        public static void GetAllMinMaxData(Serie serie, int ceilRate = 0, DataZoom dataZoom = null)
        {
            var dataList = serie.GetDataList(dataZoom);
            float max = float.MinValue;
            float min = float.MaxValue;
            for (int i = 0; i < dataList.Count; i++)
            {
                var serieData = dataList[i];
                if (serieData.show)
                {
                    var count = serie.showDataDimension > serieData.data.Count ? serieData.data.Count : serie.showDataDimension;
                    for (int j = 0; j < count; j++)
                    {
                        var value = serieData.data[j];
                        if (value > max) max = value;
                        if (value < min) min = value;
                    }
                }
            }
            serie.runtimeDataMin = ChartHelper.GetMinDivisibleValue(min, ceilRate);
            serie.runtimeDataMax = ChartHelper.GetMaxDivisibleValue(max, ceilRate);
        }
    }
}