using Godot;
using System;

public partial class World : Node2D
{
    public enum GeneratorAlgorithm
    {
        RANDOM,
        FAST_NOISE_LITE
    }
    
    
    Vector2I darkGras = new Vector2I(0, 0);
    Vector2I brightGras = new Vector2I(1, 0);
    Vector2I flower = new Vector2I(2, 0);
    TileMapLayer tileMapLayer;
        
    Vector2 screenSize;
    float worldWidth;
    float worldHeight;
    
    [Export] GeneratorAlgorithm algorithm = GeneratorAlgorithm.RANDOM;
    
    public override void _Ready()
    {
        screenSize = GetViewportRect().Size;
        worldWidth = screenSize.X;
        worldHeight = screenSize.Y;
        
        tileMapLayer = GetNode<TileMapLayer>("TileMapLayer");
        
        GD.Randomize();
        GenerateWorld();
    }

    private void GenerateWorld()
    {
        switch (algorithm)
        {
            case GeneratorAlgorithm.RANDOM:
                GenerateWorldRandom();
                break;
            case GeneratorAlgorithm.FAST_NOISE_LITE:
                GenerateWorldSimplexNoise();
                break;
            default:
                break;
        }
    }

    private void GenerateWorldRandom()
    {
        for (int y = 0; y < worldHeight; y++)
        {
            for (int x = 0; x < worldWidth; x++)
            {
                float rnd = GD.Randf();
                
                if (rnd < .7f)
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, darkGras);
                else if (rnd < .9f)
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, brightGras);
                else 
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, flower);
            }
        }
    }

    private void GenerateWorldSimplexNoise()
    {
        var noise = new FastNoiseLite();

        noise.Seed = GD.RandRange(int.MinValue, int.MaxValue);
        noise.FractalOctaves = 2;
        
        for (int y = 0; y < worldHeight; y++)
        {
            for (int x = 0; x < worldWidth; x++)
            {
                var rnd = noise.GetNoise2D(x, y);
                
                if (rnd < .3f)
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, darkGras);
                else if (rnd < .6f)
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, brightGras);
                else 
                    tileMapLayer.SetCell(new Vector2I(x, y), 0, flower);
            }
        }
    }
}