using System;
using UnityEngine;
using UnityEngine.TestTools;

namespace BracerLib.Utility
{
    [ExcludeFromCoverage]
    public static class Vector3Extensions
    {
        public static Vector3 With(this Vector3 vector, float? x = null, float? y = null, float? z = null) => new(x ?? vector.x, y ?? vector.y, z ?? vector.z);

        public static Vector3 Add(this Vector3 vector, float? x = null, float? y = null, float? z = null)
            => new(
                x != null ? vector.x + x.Value : vector.x,
                y != null ? vector.y + y.Value : vector.y,
                z != null ? vector.z + z.Value : vector.z
            );
        /// <summary>
        /// Take an existing Vector3 and truncate all its values to a certain number of decimal places.
        /// </summary>
        public static Vector3 Truncate(this Vector3 value, int decimalPlaces = 3)
        {
            double adjust = 0.5f / Mathf.Pow(10, decimalPlaces);

            return new Vector3(
                (float)Math.Round(value.x - adjust, decimalPlaces),
                (float)Math.Round(value.y - adjust, decimalPlaces),
                (float)Math.Round(value.z - adjust, decimalPlaces)
            );
        }

        public static Vector3 Floor(this Vector3 value)
        {
            return new Vector3(Mathf.Floor(value.x), Mathf.Floor(value.y), Mathf.Floor(value.z));
        }

        public static Vector3 Ceiling(this Vector3 value)
        {
            return new Vector3(Mathf.Ceil(value.x), Mathf.Ceil(value.y), Mathf.Ceil(value.z));
        }

        public static Vector3 ProjectToLine(this Vector3 point, Vector3 lineStart, Vector3 lineEnd)
        {
            return Vector3.Project(point - lineStart, lineEnd - lineStart) + lineStart;
        }
    }
}