using StgSharp.Control;
using StgSharp.Linear;
using StgSharp.Math;
using System;
using System.Collections.Generic;
using System.Text;

namespace StgSharp.Geometries
{
    public class Rectangle : IPlainGeometry
    {
        internal Point _basePoint;
        internal Point _center;
        internal Point _vertex1;
        internal Point _vertex2;
        internal RenderMode _renderMode;
        internal readonly uint bornTick;

        public override sealed Point RefOrigin => _basePoint;
        public override sealed Point RefPoint=>_center;

        public override sealed Point RefVec01 => _vertex1;

        public override sealed Point RefVec02 => _vertex2;

        public override RenderMode renderMode => _renderMode;

        public Rectangle(uint bornTime) : base(bornTime)
        {
            bornTick = bornTime;
        }

        public Rectangle(Counter<uint> tickCounter) : base(tickCounter)
        {
            bornTick = tickCounter._value;
        }

        internal override sealed void OnRender(uint tick)
        {
            tick-=bornTick;
            CalcVec01(tick);
            switch (renderMode)
            {
                case RenderMode.BasePoint:
                    CalcVec02(_basePoint._position,tick);
                    CalcVec03(_basePoint._position,tick);
                    break;
                case RenderMode.RefPoint:
                    CalcVec02(_center._position, tick);
                    CalcVec03(_center._position, tick);
                    break;
                default:
                    break;
            }
        }

        public override sealed float SetArrayX()
        {
            throw new NotImplementedException();
        }

        public override sealed float SetArrayY()
        {
            throw new NotImplementedException();
        }

        internal override void CalcVec01(uint tick)
        {
            _center._position = _basePoint._position + MovCenter(tick);
        }

        /// <summary>
        /// 计算长方形第一条对角线的一半的矢量表示
        /// </summary>
        /// <param name="vec">作为参考的矢量，根据计算模式可以分为参考原点
        /// 和参考中心点两种</param>
        /// <param name="tick">当前游戏刻</param>
        internal override void CalcVec02(vec3d vec, uint tick)
        {
            _vertex1._position = vec + UpdateCTC1(tick);
        }

        /// <summary>
        /// 计算长方形第二条对角线一半的矢量表示
        /// </summary>
        /// <param name="vec">作为参考的矢量，根据计算模式可以分为参考原点
        /// 和参考中心点两种</param>
        /// <param name="tick">当前游戏刻</param>
        /// <exception cref="ArgumentException">计算出的第二条对角线长与第一条不相等</exception>
        internal override void CalcVec03(vec3d vec, uint tick)
        {
            _vertex2._position = vec + UpdateCTC2(tick);
            if (_vertex1._position.GetLength() 
                == _vertex2._position.GetLength())
            {
                throw new ArgumentException("Cannot form a triangle, " +
                    "two crossing lines are not equal!");
            }
        }

        /// <summary>
        /// 计算中心点相对于参考原点的位移
        /// </summary>
        /// <param name="tick">当前游戏刻</param>
        /// <returns></returns>
        public virtual vec3d MovCenter(uint tick)=>default(vec3d);

        /// <summary>
        /// 计算一个顶点相对于
        /// </summary>
        /// <param name="tick"></param>
        /// <returns></returns>
        public virtual vec3d UpdateCTC1(uint tick) => default(vec3d);

        public virtual vec3d UpdateCTC2(uint tick) => default(vec3d);

        public override Line[] GetAllSides()
        {

            Line[] sides = new Line[4]
                {
                    new Line(GameTimeLine.tickCounter),
                    new Line(GameTimeLine.tickCounter),
                    new Line(GameTimeLine.tickCounter),
                    new Line(GameTimeLine.tickCounter),
                };


            sides[0]._basePoint = this._vertex1;
            sides[0]._beginPoint = this._vertex1;
            sides[0]._endPoint = this._vertex2;

            sides[1]._basePoint = this._vertex2;
            sides[1]._beginPoint = this._vertex2;
            sides[1]._endPoint = new Point() { _position = GetVertex3(GameTimeLine.tickCounter) };
            sides[1].movEnd += this.GetVertex3;

            sides[2]._basePoint = sides[1]._endPoint;
            sides[2]._beginPoint = sides[2]._basePoint;
            sides[2]._endPoint = new Point() { _position = this.GetVertex4(GameTimeLine.tickCounter) };
            sides[2].movEnd += this.GetVertex4;

            sides[3]._beginPoint = sides[2]._endPoint;
            sides[3]._endPoint = this._vertex1;

            return sides;
        }

        public override Plain GetPlain()
        {
            return new Plain(this._center, this._vertex1,this._vertex2);
        }

        protected vec3d GetVertex3(Counter<uint> tick)
        {
            return 2 * this._center._position - this._vertex1._position;
        }

        protected vec3d GetVertex4(Counter<uint> tick)
        {
            return 2 * this._center._position - this._vertex2._position;
        }
    }
}