using System.Collections.Generic;
using System.Linq;

namespace DrawGraph
{
    public class CommandManage
    {
        public bool CtrlDown = false; //CTRL键被按下
        public bool MouseLeftDown = false; //CTRL键被按下
        public global::DrawGraph.AreaManageBase AreaManage;

        private List<Command> CmdList = new List<Command>();
        private int CurrentCmdIndex = 0; //当前命令的索
        private int CmdCount = 6; //默认缓存50条命令

        private CommandManage() { }

        private static readonly CommandManage singleInstance = new CommandManage();

        public static CommandManage GetInstance
        {
            get
            {
                return singleInstance;
            }
        }
        /// <summary>
        /// 增加一个命令
        /// </summary>
        /// <param name="cmd"></param>
        public void AddCommand(Command cmd)
        {
            if (CurrentCmdIndex == 0) this.CurrentCmdIndex = this.CmdList.Count;

            int count = this.CmdList.Count - this.CurrentCmdIndex;
            if (count > 0)
            {
                this.CmdList.RemoveRange(this.CurrentCmdIndex, count);
            }

            this.CurrentCmdIndex++;
            this.CmdList.Add(cmd);
            if (this.CmdList.Count > this.CmdCount)
            {
                this.CmdList.RemoveAt(0);
                this.CurrentCmdIndex -= 1;
            }
        }
        public bool CtrlZCommand()
        {
            bool val = false;
            if (this.CurrentCmdIndex == 0)
            {
                val = false;
            }
            else
            {
                this.CurrentCmdIndex--;
                val = this.CmdList[CurrentCmdIndex].CtrlZ();
            }
            return val;
        }
        public void Clear()
        {
            CurrentCmdIndex = 0;
            CmdList.Clear();
        }
        public bool CtrlYCommand()
        {
            bool val = false;
            if (this.CurrentCmdIndex >= this.CmdList.Count)
            {
                val = false;
            }
            else
            {
                val = this.CmdList[this.CurrentCmdIndex].CtrlY();
                this.CurrentCmdIndex++;
            }
            return val;
        }
        /// <summary>
        /// 组件横向居中命令
        /// </summary>
        public void HCenterCmd(PackObjBase selectPoB)
        {
            HCenterCmd cmd = new HCenterCmd(AreaManage, selectPoB);
            cmd.Execute();
            AddCommand(cmd);
        }
        /// <summary>
        /// 组件垂直居中命令
        /// </summary>
        /// <param name="packObjBase"></param>
        public void VCenterCmd(PackObjBase selectPoB) {
            VCenterCmd cmd = new VCenterCmd(AreaManage, selectPoB);
            cmd.Execute();
            AddCommand(cmd);

        }
        public void TopAlignCmd(PackObjBase selectPoB)
        {
            TopAlignCmd cmd = new TopAlignCmd(AreaManage, selectPoB);
            cmd.Execute();
            AddCommand(cmd);
        }

        public void LeftAlignCmd(PackObjBase selectPoB)
        {
            LeftAlignCmd cmd = new LeftAlignCmd(AreaManage, selectPoB);
            cmd.Execute();
            AddCommand(cmd);
        }

        public void AlignCmdOfPack(PackObjBase selectPoB, PackObjBase jZPack, string alignType)
        {
            float x = 0, y = 0;
            if (alignType == "上") {
                x = 0;
                y = jZPack.Y - selectPoB.Y;
            }
            if(alignType == "左") {
                x = jZPack.X - selectPoB.X;
                y = 0;
            }
            if (alignType == "等宽")
            {
                x = jZPack.X - selectPoB.X;
                y = 0;
            }
            MovePackObjCommand cmd = new MovePackObjCommand(AreaManage, selectPoB);
            cmd.PreExecute();
            cmd.Execute(x, y);
            cmd.LastExecute();
            AddCommand(cmd);
        }
        /// <summary>
        /// 设置相同宽度 
        /// </summary>
        /// <param name="selectPoB">选中要变的控件</param>
        /// <param name="jZPack">基准控件</param>
        public void SameWidthCmd(PackObjBase selectPoB, PackObjBase jZPack) {
            MovePackObjCommand cmd = new MovePackObjCommand(AreaManage, selectPoB);
            cmd.PreExecute();

            //selectPoB.X = jZPack.X;
            selectPoB.EndX = selectPoB.X + jZPack.Width;

            selectPoB.Draw();
            cmd.LastExecute();
            AddCommand(cmd);
        }        
        /// <summary>
        /// 设置相同高度 
        /// </summary>
        /// <param name="selectPoB">选中要变的控件</param>
        /// <param name="jZPack">基准控件</param>
        public void SameHeightCmd(PackObjBase selectPoB, PackObjBase jZPack)
        {
            MovePackObjCommand cmd = new MovePackObjCommand(AreaManage, selectPoB);
            cmd.PreExecute();

            //selectPoB.X = jZPack.X;
            selectPoB.EndY = selectPoB.Y + jZPack.Height;

            selectPoB.Draw();
            cmd.LastExecute();
            AddCommand(cmd);
        }
        /// <summary>
        /// 设置右对齐 
        /// </summary>
        /// <param name="selectPoB">选中要变的控件</param>
        /// <param name="jZPack">基准控件</param>
        public void SameRightCmd(PackObjBase selectPoB, PackObjBase jZPack)
        {
            MovePackObjCommand cmd = new MovePackObjCommand(AreaManage, selectPoB);
            cmd.PreExecute();

            //Endx变动的距离
            float selPackEndx = jZPack.EndX - selectPoB.EndX;
            
            selectPoB.EndX = jZPack.EndX;
            selectPoB.X += selPackEndx;

            selectPoB.Draw();
            cmd.LastExecute();
            AddCommand(cmd);
        }
        
    }

    public class Command {
        protected PackObjBase selPack = null;
        protected AreaManageBase area = null;

        protected List<PackObjBase> ZList = new List<PackObjBase>();
        protected List<PackObjBase> YList = new List<PackObjBase>();
        public Command(AreaManageBase _area, PackObjBase packObj) {
            selPack = packObj;
            area = _area;
        }
        public virtual void Execute() { }

        /// <summary>
        /// 命令执行前执行的内容
        /// </summary>
        public virtual void PreExecute() { }
        public virtual void Execute(float moveSpanX, float moveSpanY) { }
        /// <summary>
        /// 命令执行后执行的内容
        /// </summary>
        public virtual void LastExecute() { }

        public bool CtrlZ()
        {
            bool val = false;
            if (ZList.Count > 0)
            {
                area.PackManage.ListPob.Clear();
                area.PackManage.ListPob.AddRange(ZList);
                val = true;
            }
            return val;
        }

        public bool CtrlY()
        {
            bool val = false;
            if (ZList.Count > 0)
            {
                area.PackManage.ListPob.Clear();
                area.PackManage.ListPob.AddRange(YList);
                val = true;
            }
            return val;
        }

        /// <summary>
        /// 不记入命令集合的对象移动方法
        /// </summary>
        /// <param name="selectPoB"></param>
        /// <param name="x">要移动的值</param>
        /// <param name="y">要移动的值</param>
        public void PackObjMove(PackObjBase selectPoB, float x, float y)
        {
            if (selectPoB is BorderPackObj) return;
            selectPoB.X += x;
            selectPoB.Y += y;

            selectPoB.EndX += x;
            selectPoB.EndY += y;

            selectPoB.Draw();
            if (selectPoB.IsCascadeUnderpinning == EIsBool.True && area != null)
            {
                List<PackObjBase> subPack = area.GetPackObjeOfParentName(selectPoB.PackName);
                foreach (PackObjBase packT in subPack)
                {
                    PackObjMove(packT, x, y);
                }
            }
        }
        /// <summary>
        /// 对象移动方法
        /// </summary>
        /// <param name="selectPoB"></param>
        /// <param name="x">要移到的值</param>
        /// <param name="y">要移到的值</param>
        public void PackObjMoveTo(PackObjBase selectPoB, float x, float y, bool isTop = true)
        {
            if (selectPoB is BorderPackObj) return;
            if (isTop)
            {
                float spanY = y - selectPoB.Y;
                selectPoB.Y = y;
                selectPoB.EndY += spanY;
                selectPoB.Draw();
            }
            else {

                float spanX = x - selectPoB.X;
                selectPoB.X = x;
                selectPoB.EndX += spanX;
                selectPoB.Draw();
            }


            if (selectPoB.IsCascadeUnderpinning == EIsBool.True && area != null)
            {
                List<PackObjBase> subPack = area.GetPackObjeOfParentName(selectPoB.PackName);
                foreach (PackObjBase packT in subPack)
                {
                    PackObjMoveTo(packT, x, y, isTop);
                }
            }
        }

    }

    /// <summary>
    /// 以父组件顶部对齐类
    /// </summary>
    public class TopAlignCmd : Command
    {
        public TopAlignCmd(AreaManageBase _area, PackObjBase packObj) : base(_area, packObj)
        {

        }
        public override void Execute()
        {
            if (selPack == null) return;

            ZList = area.PackManage.Clone();
            PackObjMoveTo(selPack, selPack.X, selPack.Y);
            YList = area.PackManage.Clone();
        }
    }
    /// <summary>
    /// 以父组件左对齐类
    /// </summary>
    public class LeftAlignCmd : Command
    {
        public LeftAlignCmd(AreaManageBase _area, PackObjBase packObj) : base(_area, packObj)
        {

        }
        public override void Execute()
        {
            if (selPack == null) return;

            ZList = area.PackManage.Clone();
            PackObjMoveTo(selPack, selPack.X, selPack.Y, false);
            YList = area.PackManage.Clone();
        }
    }
    /// <summary>
    /// 
    /// </summary>
    public class HCenterCmd : Command
    {
        public HCenterCmd(AreaManageBase _area, PackObjBase packObj) : base(_area, packObj)
        {

        }
        public override void Execute()
        {
            if (selPack == null) return;

            float parentWidth = 0;
            float parentStartX = 0;
            PackObjBase parentPack = null;

            parentPack = area.PackManage.ListPob.FirstOrDefault<PackObjBase>(s => s.PackName == selPack.ParentName);
            if (parentPack != null)
            {

                ZList = area.PackManage.Clone();

                if (parentPack is BorderPackObj)
                {
                    parentWidth = 1;
                    parentStartX = 0;
                }
                else
                {
                    parentWidth = parentPack.Width;
                    parentStartX = parentPack.X;
                }
                float startX = parentStartX + (parentWidth - selPack.Width) / 2;
                float startY = selPack.Y;
                float moveSpanX = startX - selPack.X;
                float moveSpanY = startY - selPack.Y;
                PackObjMove(selPack, moveSpanX, moveSpanY);

                YList = area.PackManage.Clone();
            }
        }
    }

    /// <summary>
    /// 
    /// </summary>
    public class VCenterCmd : Command
    {
        public VCenterCmd(AreaManageBase _area, PackObjBase packObj) : base(_area, packObj)
        {

        }
        public override void Execute()
        {
            if (selPack == null) return;
            float parentHeight = 0;
            float parentStartY = 0;
            PackObjBase parentPack = null;

            parentPack = area.PackManage.ListPob.FirstOrDefault<PackObjBase>(s => s.PackName == selPack.ParentName);
            if (parentPack != null)
            {

                ZList = area.PackManage.Clone();

                if (parentPack is BorderPackObj)
                {
                    parentHeight = 1;
                    parentStartY = 0;
                }
                else
                {
                    parentHeight = parentPack.Height;
                    parentStartY = parentPack.Y;
                }
                float startX = selPack.X;
                float startY = parentStartY + (parentHeight - selPack.Height) / 2;
                float moveSpanX = startX - selPack.X;
                float moveSpanY = startY - selPack.Y;
                PackObjMove(selPack, moveSpanX, moveSpanY);

                YList = area.PackManage.Clone();
            }
        }

    }

    public class MovePackObjCommand : Command
    {
        public MovePackObjCommand(AreaManageBase _area, PackObjBase packObj):base(_area, packObj)
        {

        }
        public override void PreExecute()
        {
            ZList = area.PackManage.Clone();
        }
        public override void Execute(float moveSpanX, float moveSpanY)
        {
            PackObjMove(selPack, moveSpanX, moveSpanY);
        }
        public override void LastExecute()
        {
            YList = area.PackManage.Clone();
        }
    }

}