using System.Collections.Generic;
using System.IO;
using Data;
using UnityEngine;

namespace Managers
{
    public class PackagesImageManager : Utils.Singleton<PackagesImageManager>
    {
        public Dictionary<string, Texture2D> packagesImages = new();
        public Dictionary<string, Sprite> sprites = new();

        public void Init()
        {
            if (packagesImages.Count > 0)
                return;
            var imageDef = Managers.DefineManager.Instance.QueryDefinesByType<ImageDef>();
            foreach (var ima in imageDef)
            {
                if (ima.path == null)
                    continue;
                var pack = Managers.DefineManager.Instance.GetDefinePackage(ima);
                var path = Path.Combine(pack.packRootPath, ima.path);
                var texture = Configs.ConfigProcessor.LoadTextureByIO(path);
                if (texture == null)
                   	continue;
                packagesImages.Add(ima.name, texture);
                SplitTextureIntoSprites(ima.name, texture, ima.hCount, ima.wCount, ima.pixelsPerUnit);
            }
        }

        void SplitTextureIntoSprites(string name, Texture2D texture, int rows, int cols, int pixelsPerUnit)
        {
            if (texture == null || rows <= 0 || cols <= 0)
            {
                Debug.LogError("Invalid parameters for splitting texture.");
                return;
            }

            var textureWidth = texture.width;
            var textureHeight = texture.height;

            var tileWidth = textureWidth / cols;
            var tileHeight = textureHeight / rows;

            // 确保纹理可以被整除
            if (tileWidth * cols != textureWidth || tileHeight * rows != textureHeight)
            {
                Debug.LogError("Texture dimensions are not divisible by the specified rows and columns.");
                return;
            }

            // 遍历每一行和每一列
            for (var row = 0; row < rows; row++)
            {
                for (var col = 0; col < cols; col++)
                {
                    // 计算当前小块的矩形区域
                    var spriteRect = new Rect(col * tileWidth, row * tileHeight, tileWidth, tileHeight);

                    // 创建Sprite
                    var sprite = Sprite.Create(texture, (Rect)spriteRect, new Vector2(0.5f, 0.5f), pixelsPerUnit);

                    var index = (rows - row - 1) * cols + col;
                    sprites[name + $"_{index}"] = sprite;
                }
            }
        }

        public void Reload()
        {
            packagesImages.Clear();
            Init();
        }

        public Sprite GetSprite(string name)
        {
            return sprites.GetValueOrDefault(name, null);
        }

        public Sprite GetSprite(string name, int index)
        {
            name += $"_{index}";
            return GetSprite(name);
        }
    }
}