using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Tilemaps;
using UnityEngine.UIElements;

public class GenerateTileMap : MonoBehaviour
{
    public int? seed;
    public int width = 256;
    public int height = 256;
    private float scale;
    private float offsetX;
    private float offsetY;
    Tilemap tilemap;
    public RuleTile forestRuleTile;
    public TileBase borderTile;
    //public List<TileBase> tiles;

    private void Awake()
    {
        tilemap = GetComponent<Tilemap>();
#if DEBUG
        //seed = 0123456789;
#endif
        if (seed == null)
        {
            seed = GenerateSeed(9);
        }

        SetSettingsFromSeed(seed.Value);
    }

    public void SetSettingsFromSeed(int seed)
    {
        UnityEngine.Random.State randomState = UnityEngine.Random.state;

        UnityEngine.Random.InitState(seed);
        scale = UnityEngine.Random.Range(17f, 23f);
        offsetX = UnityEngine.Random.Range(-10000f, 10000f);
        offsetY = UnityEngine.Random.Range(-10000f, 10000f);

        UnityEngine.Random.state = randomState;

    }

    private int GenerateSeed(int size)
    {
        System.Random rand = new System.Random();
        string seedNumbers = "0123456789";
        char[] chars = new char[size];
        for (int i = 0; i < size; i++)
        {
            chars[i] = seedNumbers[rand.Next(seedNumbers.Length)];
        }
        return int.Parse(new string(chars));
    }

    public IEnumerator GenerateTiles(Action finishedCallback, List<Vector3Int> destroyedTiles)
    {
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                float xPerlin = ((float)x / width) * scale + offsetX;
                float yPerlin = ((float)y / height) * scale + offsetY;
                float perlinNoise = Mathf.PerlinNoise(xPerlin, yPerlin);

                if (perlinNoise >= 0.3f)
                {
                    if (!destroyedTiles.Contains(new Vector3Int(x, y, 0)))
                    {
                        tilemap.SetTile(new Vector3Int(x, y), forestRuleTile);
                    }
                }

            }

            // Update UI every 8 lines
            if ((x % 8) == 0)
            {
                yield return null;
            }
        }
        finishedCallback();
    }
}