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

namespace game
{
    public class ScratchCardUtils
    {
        public static void UpdateTexture2D(Texture2D texture2D, RenderTexture renderTexture, int width, int height)
        {
            RenderTexture tmp = RenderTexture.active;
            RenderTexture.active = renderTexture;
            texture2D.ReadPixels(new Rect(0, 0, width, height), 0, 0);
            RenderTexture.active = tmp;
            texture2D.Apply();
        }

        public static Texture2D GetReadableCopy(RenderTexture renderTexture, TextureFormat format = TextureFormat.ARGB32, bool mipMaps = false, int width = 0, int height = 0)
        {
            var newTexture = default(Texture2D);

            if (renderTexture != null)
            {
                if (width <= 0)
                {
                    width = renderTexture.width;
                }

                if (height <= 0)
                {
                    height = renderTexture.height;
                }

                if (CanReadPixels(format) == true)
                {
                    newTexture = new Texture2D(width, height, format, mipMaps, false);

                    var tmp = RenderTexture.active;
                    RenderTexture.active = renderTexture;
                    newTexture.ReadPixels(new Rect(0, 0, width, height), 0, 0);
                    RenderTexture.active = tmp;

                    newTexture.Apply();
                }
            }

            return newTexture;
        }

        public static RenderTexture ReleaseRenderTexture(RenderTexture renderTexture)
        {
            return ReleaseTemporary(renderTexture);
        }

        public static RenderTexture ReleaseTemporary(RenderTexture renderTexture)
        {
            if (renderTexture != null)
            {
                renderTexture.DiscardContents();

                RenderTexture.ReleaseTemporary(renderTexture);
            }

            return null;
        }

        public static bool CanReadPixels(TextureFormat format)
        {
            if (format == TextureFormat.RGBA32 || format == TextureFormat.ARGB32 || format == TextureFormat.RGB24 || format == TextureFormat.RGBAFloat || format == TextureFormat.RGBAHalf)
            {
                return true;
            }

            return false;
        }

        public static RenderTexture GetRenderTexture(RenderTextureDescriptor desc, bool sRGB)
        {
            desc.sRGB = sRGB;

            return GetTemporary(desc, "ScratchCardUtils GetRenderTexture");
        }

        public static RenderTexture GetTemporary(RenderTextureDescriptor desc, string title)
        {
            var renderTexture = RenderTexture.GetTemporary(desc);

            // TODO: For some reason RenderTexture.GetTemporary ignores the useMipMap flag?!
            if (renderTexture.useMipMap != desc.useMipMap)
            {
                renderTexture.Release();

                renderTexture.descriptor = desc;

                renderTexture.Create();
            }

            return renderTexture;
        }
    }
}