using UnityEngine;
using UVC.Log;

namespace UVC.Extension
{
    /// <summary>
    /// RenderTexture È®Àå ¸Þ¼­µå¸¦ Á¦°øÇϴ Ŭ·¡½ºÀÔ´Ï´Ù.
    /// </summary>
    public static class RenderTextureEx
    {
        /// <summary>
        /// RenderTexture¸¦ Texture2D·Î º¯È¯ÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="renderTexture">º¯È¯ÇÒ RenderTexture °´Ã¼</param>
        /// <returns>º¯È¯µÈ Texture2D °´Ã¼</returns>
        /// <example>
        /// »ç¿ë ¿¹½Ã:
        /// <code>
        /// // RenderTexture »ý¼º
        /// RenderTexture renderTexture = new RenderTexture(256, 256, 24);
        /// 
        /// // Ä«¸Þ¶ó¿¡¼­ renderTexture¿¡ ·»´õ¸µ
        /// Camera.main.targetTexture = renderTexture;
        /// Camera.main.Render();
        /// 
        /// // RenderTexture¸¦ Texture2D·Î º¯È¯
        /// Texture2D texture2D = renderTexture.ToTexture2D();
        /// 
        /// // »ç¿ë ÈÄ Á¤¸®
        /// Camera.main.targetTexture = null;
        /// Camera.main.ResetAspect();
        /// </code>
        /// </example>
        public static Texture2D ToTexture2D(this RenderTexture renderTexture)
        {
            Texture2D texture2D = new Texture2D(renderTexture.width, renderTexture.height);
            RenderTexture.active = renderTexture;
            texture2D.ReadPixels(new UnityEngine.Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
            texture2D.Apply();
            return texture2D;
        }

        /// <summary>
        /// RenderTexture¸¦ ¹ÙÀÌÆ® ¹è¿­·Î º¯È¯ÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="renderTexture">º¯È¯ÇÒ RenderTexture °´Ã¼</param>
        /// <param name="format">À̹ÌÁö Çü½Ä (±âº»°ª: PNG)</param>
        /// <returns>¹ÙÀÌÆ® ¹è¿­</returns>
        /// <example>
        /// »ç¿ë ¿¹½Ã:
        /// <code>
        /// RenderTexture rt = new RenderTexture(256, 256, 24);
        /// byte[] bytes = rt.ToBytes();
        /// File.WriteAllBytes("screenshot.png", bytes);
        /// </code>
        /// </example>
        public static byte[] ToBytes(this RenderTexture renderTexture, TextureFormat format = TextureFormat.RGBA32)
        {
            Texture2D texture2D = renderTexture.ToTexture2D();
            byte[] bytes = texture2D.EncodeToPNG();
            Object.Destroy(texture2D);
            return bytes;
        }

        /// <summary>
        /// RenderTexture¸¦ ÁöÁ¤µÈ °æ·Î¿¡ PNG ÆÄÀÏ·Î ÀúÀåÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="renderTexture">ÀúÀåÇÒ RenderTexture °´Ã¼</param>
        /// <param name="filePath">ÀúÀåÇÒ ÆÄÀÏ °æ·Î</param>
        /// <returns>¼º°ø ¿©ºÎ</returns>
        /// <example>
        /// »ç¿ë ¿¹½Ã:
        /// <code>
        /// RenderTexture rt = new RenderTexture(256, 256, 24);
        /// Camera.main.targetTexture = rt;
        /// Camera.main.Render();
        /// bool success = rt.SaveToPNG("Assets/Screenshots/screenshot.png");
        /// Camera.main.targetTexture = null;
        /// </code>
        /// </example>
        public static bool SaveToPNG(this RenderTexture renderTexture, string filePath)
        {
            try
            {
                byte[] bytes = renderTexture.ToBytes();
                System.IO.File.WriteAllBytes(filePath, bytes);
                return true;
            }
            catch (System.Exception e)
            {
                ULog.Error($"RenderTexture¸¦ PNG·Î ÀúÀåÇÏ´Â µ¥ ½ÇÆÐÇß½À´Ï´Ù: {e.Message}", e);
                return false;
            }
        }

        /// <summary>
        /// RenderTextureÀÇ Å©±â¸¦ Á¶Á¤ÇÕ´Ï´Ù.
        /// </summary>
        /// <param name="renderTexture">¿øº» RenderTexture</param>
        /// <param name="width">»õ ³Êºñ</param>
        /// <param name="height">»õ ³ôÀÌ</param>
        /// <returns>Å©±â°¡ Á¶Á¤µÈ »õ·Î¿î RenderTexture</returns>
        /// <example>
        /// »ç¿ë ¿¹½Ã:
        /// <code>
        /// RenderTexture originalRT = new RenderTexture(1024, 1024, 24);
        /// RenderTexture resizedRT = originalRT.Resize(512, 512);
        /// // »ç¿ë ÈÄ Á¤¸®
        /// resizedRT.Release();
        /// originalRT.Release();
        /// </code>
        /// </example>
        public static RenderTexture Resize(this RenderTexture renderTexture, int width, int height)
        {
            RenderTexture resized = new RenderTexture(width, height, renderTexture.depth);
            Graphics.Blit(renderTexture, resized);
            return resized;
        }
    }
}