using System;
using UnityEngine;

namespace FIMSpace
{
    /// <summary>
    /// FM: Class which contains many helpful methods which operates on Vectors
    /// </summary>
    public static class FVectorMethods
    {
        /// <summary>
        /// Creating vector with random values in each axis
        /// </summary>
        public static Vector3 RandomVector(float rangeA, float rangeB)
        {
            return new Vector3(UnityEngine.Random.Range(rangeA, rangeB), UnityEngine.Random.Range(rangeA, rangeB), UnityEngine.Random.Range(rangeA, rangeB));
        }


        /// <summary>
        /// Just summing all vector's axes values
        /// </summary>
        public static float VectorSum(Vector3 vector)
        {
            return vector.x + vector.y + vector.z;
        }


        /// <summary>
        /// Creating vector with random values in each axis but leaving y axis at 0f
        /// </summary>
        public static Vector3 RandomVectorNoY(float rangeA, float rangeB)
        {
            return new Vector3(UnityEngine.Random.Range(rangeA, rangeB), 0f, UnityEngine.Random.Range(rangeA, rangeB));
        }


        /// <summary>
        /// Creating vector with random values in each axis with min - max random ranges values
        /// </summary>
        public static Vector3 RandomVectorMinMax(float min, float max)
        {
            float mul1 = 1f;
            if (UnityEngine.Random.Range(0, 2) == 1) mul1 = -1f;

            float mul2 = 1f;
            if (UnityEngine.Random.Range(0, 2) == 1) mul2 = -1f;

            float mul3 = 1f;
            if (UnityEngine.Random.Range(0, 2) == 1) mul3 = -1f;

            return new Vector3(UnityEngine.Random.Range(min, max) * mul1, UnityEngine.Random.Range(min, max) * mul2, UnityEngine.Random.Range(min, max) * mul3);
        }


        /// <summary>
        /// Creating vector with random values in each axis with min - max random ranges values, but leaving y value to 0f
        /// </summary>
        public static Vector3 RandomVectorNoYMinMax(float min, float max)
        {
            float mul1 = 1f;
            if (UnityEngine.Random.Range(0, 2) == 1) mul1 = -1f;

            float mul2 = 1f;
            if (UnityEngine.Random.Range(0, 2) == 1) mul2 = -1f;

            return new Vector3(UnityEngine.Random.Range(min, max) * mul1, 0f, UnityEngine.Random.Range(min, max) * mul2);
        }


        /// <summary>
        /// Returning position on screen for UI element in reference to position in world 3D space, the 'z' will be negative if text is behind camera
        /// </summary>
        public static Vector3 GetUIPositionFromWorldPosition(Vector3 position, Camera camera, RectTransform canvas)
        {
            Vector3 uiPosition = camera.WorldToViewportPoint(position);

            uiPosition.x *= canvas.sizeDelta.x;
            uiPosition.y *= canvas.sizeDelta.y;

            uiPosition.x -= canvas.sizeDelta.x * canvas.pivot.x;
            uiPosition.y -= canvas.sizeDelta.y * canvas.pivot.y;

            return uiPosition;
        }


        public static Vector2 XOZ(this Vector3 toBeFlattened)
        {
            return new Vector2(toBeFlattened.x, toBeFlattened.z);
        }
        public static Vector3 XOZ(this Vector3 toBeFlattened, float yValue = 0f)
        {
            return new Vector3(toBeFlattened.x, yValue, toBeFlattened.z);
        }

        public static float DistanceTopDown(Vector3 from, Vector3 to)
        {
            return Vector2.Distance(XOZ(from), XOZ(to));
        }


        public static float DistanceTopDownManhattan(Vector3 from, Vector3 to)
        {
            return Mathf.Abs(from.x - to.x) + Mathf.Abs(from.z - to.z);
        }


        public static float BoundsSizeOnAxis(this Bounds bounds, Vector3 normalized)
        {
            return Vector3.Scale(bounds.size, normalized).magnitude;
        }

        public static Vector3 ChooseDominantAxis(Vector3 axis)
        {
            Vector3 abs = new Vector3(Mathf.Abs(axis.x), Mathf.Abs(axis.y), Mathf.Abs(axis.z));

            if (abs.x > abs.y)
            {
                if (abs.z > abs.x)
                    return new Vector3(0f, 0f, axis.z > 0f ? 1f : -1f);
                else
                    return new Vector3(axis.x > 0f ? 1f : -1f, 0f, 0f);
            }
            else
                if (abs.z > abs.y) return new Vector3(0f, 0f, axis.z > 0f ? 1f : -1f);
            else
                return new Vector3(0f, axis.y > 0f ? 1f : -1f, 0f);
        }


        public static Vector3 GetRounded(Vector3 dir)
        {
            return new Vector3(Mathf.Round(dir.x), Mathf.Round(dir.y), Mathf.Round(dir.z));
        }


        public static Vector3 GetCounterAxis(Vector3 axis)
        {
            return new Vector3(axis.z, axis.x, axis.y);
        }


        public static Color GetAxisColor(Vector3 axis, float alpha = 0.75f)
        {
            return new Color(axis.z, axis.x, axis.y, alpha);
        }


        public static Vector3 FlattenVector(Vector3 v, float to = 90f)
        {
            //Vector3 moved = v;

            v.x = Mathf.Round(v.x / to) * to;
            v.y = Mathf.Round(v.y / to) * to;
            v.z = Mathf.Round(v.z / to) * to;

            //float modulo = to % 2;
            //if (modulo > 0f && modulo < 1f)
            //{
            //    moved = v - moved;
            //    Vector3 offset = Vector3.zero;
            //    if (moved.x != 0f) offset.x = Mathf.Sign(moved.x) * modulo;
            //    if (moved.y != 0f) offset.y = Mathf.Sign(moved.y) * modulo;
            //    if (moved.z != 0f) offset.z = Mathf.Sign(moved.z) * modulo;

            //    v += offset;
            //    UnityEngine.Debug.Log("modulo " + modulo + " moved " + moved + " offset by " + offset);
            //}

            return v;
        }

        public static Vector3 FlattenVectorFlr(Vector3 v, float to = 90f)
        {
            v.x = Mathf.Floor(v.x / to) * to;
            v.y = Mathf.Floor(v.y / to) * to;
            v.z = Mathf.Floor(v.z / to) * to;
            return v;
        }

        public static Vector3 FlattenVectorCeil(Vector3 v, float to = 90f)
        {
            v.x = Mathf.Ceil(v.x / to) * to;
            v.y = Mathf.Ceil(v.y / to) * to;
            v.z = Mathf.Ceil(v.z / to) * to;
            return v;
        }

        public static Vector3 FlattenVector(Vector3 v, Vector3 to)
        {
            v.x = Mathf.Round(v.x / to.x) * to.x;
            v.y = Mathf.Round(v.y / to.y) * to.y;
            v.z = Mathf.Round(v.z / to.z) * to.z;
            return v;
        }

#if UNITY_2018_4_OR_NEWER
        public static Vector3Int V3toV3Int(Vector3 v)
        {
            return new Vector3Int(Mathf.RoundToInt(v.x), Mathf.RoundToInt(v.y), Mathf.RoundToInt(v.z));
        }
#endif

        public static Vector3 FlattenNormal(Quaternion orientation, Vector3? forward = null, float to = 90f)
        {
            Vector3 f = forward == null ? Vector3.forward : forward.Value;
            var vec = FlattenVector(orientation.eulerAngles, to);
            return Quaternion.Euler(vec) * f;
        }


        public static Vector3 EqualVector(float valueAll)
        {
            return new Vector3(valueAll, valueAll, valueAll);
        }


        public static Quaternion FlattenRotation(Quaternion orientation, float to = 90f)
        {
            var vec = FlattenVector(orientation.eulerAngles, to);
            return Quaternion.Euler(vec);
        }

    }
}