using Godot;
using System;
using System.Collections.Generic;

public partial class TexLoader
{
    private static TexLoader _instance;

    public static TexLoader Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = new TexLoader();
            }
            return _instance;
        }
    }

    public class LoadedTexture
    {
        public ImageTexture tex;
        public int texWidth;
        public int texHeight;
        public IntPtr texPtr => (IntPtr)tex.GetRid().Id;
    }

    public Dictionary<string, LoadedTexture> loadedTextures = new Dictionary<string, LoadedTexture>();

    public (IntPtr texPtr, int texWidth, int texHeight) GetPng(string path)
    {
        IntPtr texPtr;
        int texWidth, texHeight;

        if (loadedTextures.ContainsKey(path) && loadedTextures.TryGetValue(path, out LoadedTexture loadedTexture))
        {
            texPtr = loadedTexture.texPtr;
            texWidth = loadedTexture.texWidth;
            texHeight = loadedTexture.texHeight;
        }
        else
        {
            texPtr = 0;
            texWidth = 0;
            texHeight = 0;
        }

        return (texPtr, texWidth, texHeight);
    }

    public bool LoadPng(string path)
    {
        GD.Print("Attempting to load png: " + path);

        if (loadedTextures.ContainsKey(path))
        {
            return true;
        }

        try
        {
            LoadedTexture loadedTex;

            Image img = new Image();
            var err = img.Load(path);
            if (err != Error.Ok)
            {
                // Provide a dummy texture instead as a fallback
                loadedTextures.Add(path, new LoadedTexture()
                {
                    texWidth = 0,
                    texHeight = 0,
                    tex = new ImageTexture()
                });

                return false;
            }

            // Create a Godot texture
            ImageTexture tex = ImageTexture.CreateFromImage(img);

            loadedTex = new LoadedTexture
            {
                tex = tex,
                texWidth = img.GetWidth(),
                texHeight = img.GetHeight()
            };

            loadedTextures[path] = loadedTex;

            return true;
        }
        catch (Exception ex)
        {
            GD.PrintErr("Failed to load png: " + ex.Message);
            loadedTextures.Add(path, new LoadedTexture()
            {
                texWidth = 0,
                texHeight = 0,
                tex = new ImageTexture()
            });

            return false;
        }
    }
}