using System.Collections.Generic;

using Syntriax.Engine.Core;

namespace Syntriax.Engine.Physics2D.Primitives;

public record AABB(Vector2D LowerBoundary, Vector2D UpperBoundary)
{
    public static AABB FromVector2Ds(IList<Vector2D> vectors)
    {
        if (vectors.Count < 2)
            throw new System.ArgumentException($"Parameter {nameof(vectors)} must have at least 2 items.");

        Vector2D lowerBoundary = vectors[0];
        Vector2D upperBoundary = vectors[0];

        for (int i = 1; i < vectors.Count; i++)
        {
            Vector2D vector = vectors[i];
            lowerBoundary = Vector2D.Min(lowerBoundary, vector);
            upperBoundary = Vector2D.Max(upperBoundary, vector);
        }

        return new(lowerBoundary, upperBoundary);
    }

    public static bool ApproximatelyEquals(AABB left, AABB right)
        => left.LowerBoundary.ApproximatelyEquals(right.LowerBoundary) && left.UpperBoundary.ApproximatelyEquals(right.UpperBoundary);
}

public static class AABBExtensions
{
    public static AABB ToAABB(this IList<Vector2D> vectors) => AABB.FromVector2Ds(vectors);

    public static bool ApproximatelyEquals(this AABB left, AABB right) => AABB.ApproximatelyEquals(left, right);
}