using System;
using FOU.Scripts.Elements;
using Godot;

namespace FOU.Scripts;

public class Level {
    public int SizeX;
    public int SizeY;
    private Image mImage;
    private int _frame;

    private Element[,] _elements;
    private Level _this;

    public Level(int x, int y) {
        GD.Print($"Generating level ({x}:{y})");
        _this = this;

        SizeX = x;
        SizeY = y;

        _elements = new Element[x, y];
        for (int i = 0; i < SizeX; i++) {
            for (int j = 0; j < SizeY; j++) {
                _elements[i,j] = new Element(i, j, ref _this);
            }
        }

        mImage = Image.Create(SizeX, SizeY, false, Image.Format.Rgb8);
        mImage.Fill(Colors.Black);
    }

    public void Update() {
        for (int x = 0; x < SizeX; x++) {
            for (int y = 0; y < SizeY; y++) {
                if (_elements[x,y] != null)
                    _elements[x,y].Update(_frame);
            }
        }
        _frame++;
    }

    public void WritePixel(int x, int y, int size) {
        int halfsize = size/2;

        for (int i = -halfsize; i <= halfsize; i++) {
            for (int j = -halfsize; j <= halfsize; j++) {
                int X = Mathf.Clamp(x + i, 0, SizeX-1);
                int Y = Mathf.Clamp(y + j, 0, SizeY-1);
                _elements[X,Y] = new Dirt(X, Y, ref _this);
            }
        }
    }

    public Image DrawLevel() {
        for (int x = 0; x < SizeX; x++) {
            for (int y = 0; y < SizeY; y++) {
                // if (_elements[x,y] == null) continue;

                mImage.SetPixel(x,y, _elements[x,y].Color);
            }
        }
        return mImage;
    }

    public void Swap(Element what, Vector2I swapTo) {
        Element old = Get(swapTo);
        Set(old, what.Position);
        Set(what, swapTo);
    }


    public Element Get(Vector2I where) {
        if (where.X < 0 || where.X >= SizeX) return null;
        if (where.Y < 0 || where.Y >= SizeY) return null;

        return _elements[where.X, where.Y];
    }

    public Element Get(int x, int y) {
        if (x < 0 || x >= SizeX) return null;
        if (y < 0 || y >= SizeY) return null;

        return _elements[x,y];
    }

    private void Set(Element what, Vector2I where) {
        if (what == null) return;

        what.Position = where;
        _elements[where.X, where.Y] = what;
    }
}