using UnityEngine;
using System.Collections;
using UnityEngine.UI;
namespace MetaClient
{
    public class ColorPick : MonoBehaviour
    {

        public Image Saturation;
        public Image Hue;
        public Image Paint;
        public RectTransform Point_Stauration;
        public RectTransform Point_Hue;
        private Sprite Saturation_Sprite;
        private Sprite Hue_Sprite;
        private Color32 currentHue = Color.red;
        public Text colorText;
        public UICustom uICustom;
        private void Awake()
        {
        }
        private void Start()
        {
            UpdateStauration();
            UpdateHue();
        }
        float sWidth = 200, sHeight = 200;
        //更新饱和度
        private void UpdateStauration()
        {
            Saturation_Sprite = Sprite.Create(new Texture2D((int)sWidth, (int)sHeight), new Rect(0, 0, sWidth, sHeight), new Vector2(0, 0));
            for (int y = 0; y <= sHeight; y++)
            {
                for (int x = 0; x < sWidth; x++)
                {
                    var pixColor = GetSaturation(currentHue, x / sWidth, y / sHeight);
                    Saturation_Sprite.texture.SetPixel(x, ((int)sHeight - y), pixColor);
                }
            }
            Saturation_Sprite.texture.Apply();
            Saturation.sprite = Saturation_Sprite;
        }
        //更新色泽度
        private void UpdateHue()
        {
            float w = 50, h = 50;
            Hue_Sprite = Sprite.Create(new Texture2D((int)w, (int)h), new Rect(0, 0, w, h), new Vector2(0, 0));
            for (int y = 0; y <= h; y++)
            {
                for (int x = 0; x < w; x++)
                {
                    var pixColor = GetHue(y / h);
                    Hue_Sprite.texture.SetPixel(x, ((int)h - y), pixColor);
                }
            }
            Hue_Sprite.texture.Apply();
            Hue.sprite = Hue_Sprite;
        }
        private Vector2 clickPoint = Vector2.zero;
        public void OnStaurationClick(ColorPickClick sender)
        {
            var size2 = Saturation.rectTransform.sizeDelta / 2;
            var pos = Vector2.zero;
            pos.x = Mathf.Clamp(sender.ClickPoint.x, -size2.x, size2.x);
            pos.y = Mathf.Clamp(sender.ClickPoint.y, -size2.y, size2.y);
            Point_Stauration.anchoredPosition = clickPoint = pos;

            UpdateColor();
        }
        public void UpdateColor()
        {
            var size2 = Saturation.rectTransform.sizeDelta / 2;
            var pos = clickPoint;
            pos += size2;
            var color = GetSaturation(currentHue, pos.x / Saturation.rectTransform.sizeDelta.x, 1 - pos.y / Saturation.rectTransform.sizeDelta.y);
            Paint.color = color;
            int r = Mathf.RoundToInt(color.r * 255.0f);
            int g = Mathf.RoundToInt(color.g * 255.0f);
            int b = Mathf.RoundToInt(color.b * 255.0f);
            int a = Mathf.RoundToInt(color.a * 255.0f);
            string theHexColor = string.Format("{0:X2}{1:X2}{2:X2}{3:X2}", r, g, b, a);
            colorText.text = theHexColor + "";
            uICustom.ColorChange(new Vector3(color.r, color.g, color.b));
        }
        






        public void OnHueClick(ColorPickClick sender)
        {
            var h = Hue.rectTransform.sizeDelta.y / 2.0f;
            var y = Mathf.Clamp(sender.ClickPoint.y, -h, h);
            Point_Hue.anchoredPosition = new Vector2(0, y);
            y += h;
            currentHue = GetHue(1 - y / Hue.rectTransform.sizeDelta.y);
            UpdateStauration();
            UpdateColor();
        }
        private static Color GetSaturation(Color color, float x, float y)
        {
            Color newColor = Color.white;
            for (int i = 0; i < 3; i++)
            {
                if (color[i] != 1)
                {
                    newColor[i] = (1 - color[i]) * (1 - x) + color[i];
                }
            }
            newColor *= (1 - y);
            newColor.a = 1;
            return newColor;
        }
        //B,r,G,b,R,g //大写是升，小写是降
        private readonly static int[] hues = new int[] { 2, 0, 1, 2, 0, 1 };
        private readonly static Color[] colors = new Color[] { Color.red, Color.blue, Color.blue, Color.green, Color.green, Color.red };
        private readonly static float c = 1.0f / hues.Length;
        private static Color GetHue(float y)
        {
            y = Mathf.Clamp01(y);
            var index = (int)(y / c);
            var h = hues[index];
            var newColor = colors[index];
            float less = (y - index * c) / c;
            newColor[h] = index % 2 == 0 ? less : 1 - less;
            return newColor;
        }
    }
}