using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.UI;

namespace XCharts
{
    /// <summary>
    /// VisualMap component.
    /// 视觉映射组件。用于进行『视觉编码』，也就是将数据映射到视觉元素（视觉通道）。
    /// </summary>
    [System.Serializable]
    public class VisualMap
    {
        /// <summary>
        /// 类型。分为连续型和分段型。
        /// </summary>
        public enum Type
        {
            /// <summary>
            /// 连续型。
            /// </summary>
            Continuous,
            /// <summary>
            /// 分段型。
            /// </summary>
            Piecewise
        }

        /// <summary>
        /// 选择模式
        /// </summary>
        public enum SelectedMode
        {
            /// <summary>
            /// 多选。
            /// </summary>
            Multiple,
            /// <summary>
            /// 单选。
            /// </summary>
            Single
        }

        [SerializeField] private bool m_Enable = false;
        [SerializeField] private bool m_Show = true;
        [SerializeField] private Type m_Type = Type.Continuous;
        [SerializeField] private SelectedMode m_SelectedMode = SelectedMode.Multiple;
        [SerializeField] private float m_Min = 0;
        [SerializeField] private float m_Max = 100f;

        [SerializeField] private float[] m_Range = new float[2] { 0, 100f };
        [SerializeField] private string[] m_Text = new string[2] { "", "" };
        [SerializeField] private float[] m_TextGap = new float[2] { 10f, 10f };
        [SerializeField] private int m_SplitNumber = 5;
        [SerializeField] private bool m_Calculable = false;
        [SerializeField] private bool m_Realtime = true;
        [SerializeField] private float m_ItemWidth = 20f;
        [SerializeField] private float m_ItemHeight = 140f;
        [SerializeField] private float m_BorderWidth = 0;
        [SerializeField] private int m_Dimension = 0;
        [SerializeField] private bool m_HoverLink = true;
        [SerializeField] private Orient m_Orient = Orient.Horizonal;
        [SerializeField] private Location m_Location = Location.defaultLeft;
        [SerializeField] private List<Color> m_InRange = new List<Color>();
        [SerializeField] private List<Color> m_OutOfRange = new List<Color>();

        /// <summary>
        /// 是否开启组件功能。
        /// </summary>
        public bool enable { get { return m_Enable; } set { m_Enable = value; } }
        /// <summary>
        /// 是否显示组件。如果设置为 false，不会显示，但是数据映射的功能还存在。
        /// </summary>
        public bool show { get { return m_Show; } set { m_Show = value; } }
        /// <summary>
        /// 组件类型。
        /// </summary>
        public Type type { get { return m_Type; } set { m_Type = value; } }
        /// <summary>
        /// 选择模式。
        /// </summary>
        public SelectedMode selectedMode { get { return m_SelectedMode; } set { m_SelectedMode = value; } }
        /// <summary>
        /// 允许的最小值。'min' 必须用户指定。[visualMap.min, visualMap.max] 形成了视觉映射的『定义域』。
        /// </summary>
        public float min { get { return m_Min; } set { m_Min = value; } }
        /// <summary>
        /// 允许的最大值。'max' 必须用户指定。[visualMap.min, visualMax.max] 形成了视觉映射的『定义域』。
        /// </summary>
        public float max { get { return m_Max; } set { m_Max = value < min ? min + 1 : value; } }
        /// <summary>
        /// 指定手柄对应数值的位置。range 应在 min max 范围内。
        /// </summary>
        public float[] range { get { return m_Range; } }
        /// <summary>
        /// 两端的文本，如 ['High', 'Low']。
        /// </summary>
        public string[] text { get { return m_Text; } }
        /// <summary>
        /// 两端文字主体之间的距离，单位为px。
        /// </summary>
        public float[] textGap { get { return m_TextGap; } }
        /// <summary>
        /// 对于连续型数据，自动平均切分成几段，默认为0时自动匹配inRange颜色列表大小。
        /// </summary>
        /// <value></value>
        public int splitNumber { get { return m_SplitNumber; } set { m_SplitNumber = value; } }
        /// <summary>
        /// 是否显示拖拽用的手柄（手柄能拖拽调整选中范围）。
        /// </summary>
        public bool calculable { get { return m_Calculable; } set { m_Calculable = value; } }
        /// <summary>
        /// 拖拽时，是否实时更新。
        /// </summary>
        public bool realtime { get { return m_Realtime; } set { m_Realtime = value; } }
        /// <summary>
        /// 图形的宽度，即颜色条的宽度。
        /// </summary>
        public float itemWidth { get { return m_ItemWidth; } set { m_ItemWidth = value; } }
        /// <summary>
        /// 图形的高度，即颜色条的高度。
        /// </summary>
        public float itemHeight { get { return m_ItemHeight; } set { m_ItemHeight = value; } }
        /// <summary>
        /// 边框线宽，单位px。
        /// </summary>
        public float borderWidth { get { return m_BorderWidth; } set { m_BorderWidth = value; } }
        /// <summary>
        /// 指定用数据的『哪个维度』，映射到视觉元素上。『数据』即 series.data。从1开始，默认为0取 data 中最后一个维度。
        /// </summary>
        public int dimension { get { return m_Dimension; } set { m_Dimension = value; } }
        /// <summary>
        /// 打开 hoverLink 功能时，鼠标悬浮到 visualMap 组件上时，鼠标位置对应的数值 在 图表中对应的图形元素，会高亮。
        /// 反之，鼠标悬浮到图表中的图形元素上时，在 visualMap 组件的相应位置会有三角提示其所对应的数值。
        /// </summary>
        /// <value></value>
        public bool hoverLink { get { return m_HoverLink; } set { m_HoverLink = value; } }
        /// <summary>
        /// Specify whether the layout of component is horizontal or vertical. 
        /// 布局方式是横还是竖。
        /// </summary>
        public Orient orient { get { return m_Orient; } set { m_Orient = value; } }
        /// <summary>
        /// The location of component.
        /// 组件显示的位置。
        /// </summary>
        public Location location { get { return m_Location; } set { m_Location = value; } }
        /// <summary>
        /// 定义 在选中范围中 的视觉颜色。
        /// </summary>
        public List<Color> inRange { get { return m_InRange; } set { if (value != null) m_InRange = value; } }
        /// <summary>
        /// 定义 在选中范围外 的视觉颜色。
        /// </summary>
        public List<Color> outOfRange { get { return m_OutOfRange; } set { if (value != null) m_OutOfRange = value; } }

        /// <summary>
        /// 鼠标悬停选中的index
        /// </summary>
        /// <value></value>
        public int rtSelectedIndex { get; set; }
        public float rtSelectedValue { get; set; }
        /// <summary>
        /// the current pointer position.
        /// 当前鼠标位置。
        /// </summary>
        public Vector2 pointerPos { get; set; }
        public bool isVertical { get { return orient == Orient.Vertical; } }
        public float rangeMin
        {
            get
            {
                if (m_Range[0] < min || m_Range[0] > max) return min;
                else return m_Range[0];
            }
            set
            {
                if (value >= min && value <= m_Range[1]) m_Range[0] = value;
            }
        }

        public float rangeMax
        {
            get
            {
                if (m_Range[1] >= m_Range[0] && m_Range[1] < max) return m_Range[1];
                else return max;
            }
            set
            {
                if (value >= m_Range[0] && value <= max) m_Range[1] = value;
            }
        }

        public int rtSplitNumber
        {
            get
            {
                if (splitNumber > 0 && splitNumber <= m_InRange.Count) return splitNumber;
                else return inRange.Count;
            }
        }

        public float rangeMinHeight { get { return (rangeMin - min) / (max - min) * itemHeight; } }
        public float rangeMaxHeight { get { return (rangeMax - min) / (max - min) * itemHeight; } }

        private List<Color> m_RtInRange = new List<Color>();
        public List<Color> rtInRange
        {
            get
            {
                if (splitNumber == 0 || m_InRange.Count >= splitNumber || m_InRange.Count < 1) return m_InRange;
                else
                {
                    if (m_RtInRange.Count != rtSplitNumber)
                    {
                        m_RtInRange.Clear();
                        var total = max - min;
                        var diff1 = total / (m_InRange.Count - 1);
                        var diff2 = total / splitNumber;

                        var inCount = 0;
                        var inValue = min;
                        var rtValue = min;


                        for (int i = 0; i < splitNumber; i++)
                        {
                            rtValue += diff2;
                            if (rtValue > inValue + diff1)
                            {
                                inValue += diff1;
                                inCount++;
                            }
                            if (i == splitNumber - 1)
                            {
                                m_RtInRange.Add(m_InRange[m_InRange.Count - 1]);
                            }
                            else
                            {
                                var rate = (rtValue - inValue) / diff1;
                                m_RtInRange.Add(Color.Lerp(m_InRange[inCount], m_InRange[inCount + 1], rate));
                            }
                        }
                    }
                    return m_RtInRange;
                }
            }
        }

        public Color GetColor(float value)
        {
            int splitNumber = rtInRange.Count;
            if (splitNumber <= 0) return Color.clear;
            value = Mathf.Clamp(value, min, max);

            var diff = (max - min) / (splitNumber - 1);
            var index = GetIndex(value);
            var nowMin = min + index * diff;
            var rate = (value - nowMin) / diff;
            if (index == splitNumber - 1) return rtInRange[index];
            else return Color.Lerp(rtInRange[index], rtInRange[index + 1], rate);
        }

        public int GetIndex(float value)
        {
            int splitNumber = rtInRange.Count;
            if (splitNumber <= 0) return -1;
            value = Mathf.Clamp(value, min, max);

            var diff = (max - min) / (splitNumber - 1);
            var index = -1;
            for (int i = 0; i < splitNumber; i++)
            {
                if (value <= min + (i + 1) * diff)
                {
                    index = i;
                    break;
                }
            }
            return index;
        }

        public bool IsInSelectedValue(float value)
        {
            if (rtSelectedIndex < 0) return true;
            else
            {
                return rtSelectedIndex == GetIndex(value);
            }
        }

        public float GetValue(Vector3 pos, float chartWidth, float chartHeight)
        {
            var centerPos = location.GetPosition(chartWidth, chartHeight);
            var pos1 = centerPos + (isVertical ? Vector3.down : Vector3.left) * itemHeight / 2;
            var pos2 = centerPos + (isVertical ? Vector3.up : Vector3.right) * itemHeight / 2;
            if (isVertical)
            {
                if (pos.y < pos1.y) return min;
                else if (pos.y > pos2.y) return max;
                else return min + (pos.y - pos1.y) / (pos2.y - pos1.y) * (max - min);
            }
            else
            {
                if (pos.x < pos1.x) return min;
                else if (pos.x > pos2.x) return max;
                else return min + (pos.x - pos1.x) / (pos2.x - pos1.x) * (max - min);
            }
        }

        public bool IsInRect(Vector3 local, float chartWidth, float chartHeight, float triangleLen = 20)
        {
            var centerPos = location.GetPosition(chartWidth, chartHeight);
            var diff = calculable ? triangleLen : 0;
            if (local.x >= centerPos.x - itemWidth / 2 - diff && local.x <= centerPos.x + itemWidth / 2 + diff &&
                local.y >= centerPos.y - itemHeight / 2 - diff && local.y <= centerPos.y + itemHeight / 2 + diff)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        public bool IsInRangeRect(Vector3 local, float chartWidth, float chartHeight)
        {
            var centerPos = location.GetPosition(chartWidth, chartHeight);
            if (orient == Orient.Vertical)
            {
                var pos1 = centerPos + Vector3.down * itemHeight / 2;
                return local.x >= centerPos.x - itemWidth / 2 && local.x <= centerPos.x + itemWidth / 2 &&
                local.y >= pos1.y + rangeMinHeight && local.y <= pos1.y + rangeMaxHeight;
            }
            else
            {
                var pos1 = centerPos + Vector3.left * itemHeight / 2;
                return local.x >= pos1.x + rangeMinHeight && local.x <= pos1.x + rangeMaxHeight &&
                local.y >= centerPos.y - itemWidth / 2 && local.y <= centerPos.y + itemWidth / 2;
            }
        }

        public bool IsInRangeMinRect(Vector3 local, float chartWidth, float chartHeight, float triangleLen)
        {
            var centerPos = location.GetPosition(chartWidth, chartHeight);
            if (orient == Orient.Vertical)
            {
                var radius = triangleLen / 2;
                var pos1 = centerPos + Vector3.down * itemHeight / 2;
                var cpos = new Vector3(pos1.x + itemWidth / 2 + radius, pos1.y + rangeMinHeight - radius);

                return local.x >= cpos.x - radius && local.x <= cpos.x + radius &&
                local.y >= cpos.y - radius && local.y <= cpos.y + radius;
            }
            else
            {
                var radius = triangleLen / 2;
                var pos1 = centerPos + Vector3.left * itemHeight / 2;
                var cpos = new Vector3(pos1.x + rangeMinHeight, pos1.y + itemWidth / 2 + radius);
                return local.x >= cpos.x - radius && local.x <= cpos.x + radius &&
                local.y >= cpos.y - radius && local.y <= cpos.y + radius;
            }
        }

        public bool IsInRangeMaxRect(Vector3 local, float chartWidth, float chartHeight, float triangleLen)
        {
            var centerPos = location.GetPosition(chartWidth, chartHeight);
            if (orient == Orient.Vertical)
            {
                var radius = triangleLen / 2;
                var pos1 = centerPos + Vector3.down * itemHeight / 2;
                var cpos = new Vector3(pos1.x + itemWidth / 2 + radius, pos1.y + rangeMaxHeight + radius);

                return local.x >= cpos.x - radius && local.x <= cpos.x + radius &&
                local.y >= cpos.y - radius && local.y <= cpos.y + radius;
            }
            else
            {
                var radius = triangleLen / 2;
                var pos1 = centerPos + Vector3.left * itemHeight / 2;
                var cpos = new Vector3(pos1.x + rangeMaxHeight + radius, pos1.y + itemWidth / 2 + radius);
                return local.x >= cpos.x - radius && local.x <= cpos.x + radius &&
                local.y >= cpos.y - radius && local.y <= cpos.y + radius;
            }
        }
    }
}