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

public partial class TileMapping : Node
{
    /// <summary>
    /// From tile coordinates to pixel coordinates. If null, use the offset instead.
    /// </summary>
    private Dictionary<Vector2I, Vector2I> pixelMap;
    /// <summary>
    /// If pixelMap is null, use this offset to convert tile coordinates to pixel coordinates.
    /// </summary>
    private Vector2I pixelOffset;
    private Rect2I tileRect;

    public TileMapping(Dictionary<Vector2I, Vector2I> map) {
        pixelMap = map;
        pixelOffset = new Vector2I(-int.MaxValue, -int.MaxValue);
    }

    public TileMapping(Vector2I offset, Rect2I rect) {
        pixelMap = null;
        pixelOffset = offset;
        tileRect = rect;
    }

    public void Apply(TileMapLayer layer) {
        // if pixelMap is not null, use all the pairs in pixelMap to set the tiles.
        if (pixelMap != null) {
            var sourceId = layer.GetCellSourceId(pixelMap.Keys.First());
            foreach (var pair in pixelMap) {
                layer.SetCell(pair.Key, sourceId, pair.Value);
            }
        } else {
            var sourceId = layer.GetCellSourceId(tileRect.Position);
            GD.Print(tileRect);
            for (int x = tileRect.Position.X; x < tileRect.End.X; x++) {
                for (int y = tileRect.Position.Y; y < tileRect.End.Y; y++) {
                    var pos = new Vector2I(x, y);
                    layer.SetCell(pos, sourceId, pos + pixelOffset);
                }
            }
        }
    }
}