#if UNITY_EDITOR

using UnityEditor;
using UnityEngine;

namespace FIMSpace.FEditor
{

    public static class FGUI_Handles
    {

        public static void DrawArrow( Vector3 position, Quaternion direction, float scale = 1f, float width = 5f, float stripeLength = 1f )
        {
            Vector3[] points = new Vector3[8];

            // Low base dots
            points[0] = new Vector3( -0.12f, 0f, 0f );
            points[1] = new Vector3( 0.12f, 0f, 0f );

            // Pre tip right triangle dot
            points[2] = new Vector3( 0.12f, 0f, 0.4f + 1 * stripeLength );
            // Tip right side
            points[3] = new Vector3( 0.4f, 0f, 0.32f + 1 * stripeLength );
            // Tip
            points[4] = new Vector3( 0.0f, 0f, 1f + 1 * stripeLength );
            // Tip left side
            points[5] = new Vector3( -0.4f, 0f, 0.32f + 1 * stripeLength );
            // Pre tip left triangle dot
            points[6] = new Vector3( -0.12f, 0f, 0.4f + 1 * stripeLength );
            points[7] = points[0];


            Matrix4x4 rotation = Matrix4x4.TRS( Vector3.zero, direction, Vector3.one * scale );

            for( int i = 0; i < points.Length; i++ )
            {
                points[i] = rotation.MultiplyPoint( points[i] );
                points[i] += position;
            }

            if( width <= 0f )
                Handles.DrawPolyLine( points );
            else
                Handles.DrawAAPolyLine( width, points );
        }

        public static void DrawBoneHandle( Vector3 from, Vector3 to, Vector3 forward, float fatness = 1f, float width = 1f, float arrowOffset = 1f, float lineWidth = 1f, float fillAlpha = 0f )
        {
            Vector3 dir = ( to - from );
            float ratio = dir.magnitude / 7f; ratio *= fatness;
            float baseRatio = ratio * 0.75f * arrowOffset;
            ratio *= width;
            Quaternion rot = ( dir == Vector3.zero ? rot = Quaternion.identity : rot = Quaternion.LookRotation( dir, forward ) );
            dir.Normalize();

            Vector3 p = from + dir * baseRatio;

            if( lineWidth <= 1f )
            {
                Handles.DrawLine( from, to );
                Handles.DrawLine( to, p + rot * Vector3.right * ratio );
                Handles.DrawLine( from, p + rot * Vector3.right * ratio );
                Handles.DrawLine( to, p - rot * Vector3.right * ratio );
                Handles.DrawLine( from, p - rot * Vector3.right * ratio );
            }
            else
            {
                Handles.DrawAAPolyLine( lineWidth, from, to );
                Handles.DrawAAPolyLine( lineWidth, to, p + rot * Vector3.right * ratio );
                Handles.DrawAAPolyLine( lineWidth, from, p + rot * Vector3.right * ratio );
                Handles.DrawAAPolyLine( lineWidth, to, p - rot * Vector3.right * ratio );
                Handles.DrawAAPolyLine( lineWidth, from, p - rot * Vector3.right * ratio );
            }

            if ( fillAlpha > 0f)
            {
                Color preC = Handles.color;
                Handles.color = new Color( preC.r, preC.g, preC.b, fillAlpha * preC.a );
                Handles.DrawAAConvexPolygon( from, p + rot * Vector3.right * ratio, to, p - rot * Vector3.right * ratio, from );
                Handles.color = preC;
            }
        }

        public static void DrawBoneHandle( Vector3 from, Vector3 to, float fatness = 1f, bool faceCamera = false, float width = 1f, float arrowOffset = 1f, float lineWidth = 1f, float fillAlpha = 0f )
        {
            Vector3 forw = ( to - from ).normalized;

            if( faceCamera )
            {
                if( SceneView.lastActiveSceneView != null )
                    if( SceneView.lastActiveSceneView.camera )
                        forw = ( to - SceneView.lastActiveSceneView.camera.transform.position ).normalized;
            }

            DrawBoneHandle( from, to, forw, fatness, width, arrowOffset, lineWidth, fillAlpha );
        }

        public static void DrawRay( Vector3 pos, Vector3 dir )
        {
            Handles.DrawLine( pos, pos + dir );
        }

        public static void DrawDottedRay( Vector3 pos, Vector3 dir, float scale = 2f )
        {
            Handles.DrawDottedLine( pos, pos + dir, scale );
        }

    }

}

#endif