using Unity.Mathematics;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public struct TileRect
    {
        public static readonly TileRect Empty = new(int2.zero, int2.zero);

        public static readonly TileRect Everything = new(int.MinValue, int.MaxValue);

        private int2 _min;

        private int2 _max;

        public int2 Min
        {
            readonly get => _min;
            set
            {
                _min = value;
                _max = math.max(_min, _max);
            }
        }

        public int2 Max
        {
            readonly get => _max;
            set
            {
                _max = value;
                _min = math.min(_min, _max);
            }
        }

        public int Width => _max.x - _min.x + 1;

        public int Height => _max.y - _min.y + 1;

        public int2 Center => (_min + _max) / 2;

        public TileRect(int2 min, int2 max)
        {
            _min = math.min(min, max);
            _max = math.max(min, max);
        }

        public TileRect(int2 min, int width, int height) : this(min, min + new int2(width - 1, height - 1))
        {
        }

        public readonly bool Contains(int2 tile)
        {
            return tile.x >= Min.x && tile.x <= Max.x && tile.y >= Min.y && tile.y <= Max.y;
        }

        public readonly bool Intersects(TileRect other)
        {
            return !(other.Max.x < Min.x || other.Min.x > Max.x || other.Max.y < Min.y || other.Min.y > Max.y);
        }

        public readonly TileRect Inflate(int amount)
        {
            return amount == int.MaxValue ? Everything : new TileRect(Min - amount, Max + amount);
        }

        public static TileRect OneTile(int2 tile)
        {
            return new TileRect(tile, 1, 1);
        }
    }
}