using Microsoft.AspNetCore.Components;
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Threading.Tasks;

namespace wispro.sp.winClient
{
    public partial class FlowChart
    {
        [Parameter]
        public double TitleHeight { get; set; } = 100;


        [Parameter]
        public double ChartWidth { get; set; } = 1200;
        [Parameter]
        public double ChartHeight { get; set; } = 900;
        [Parameter]
        public double rectWidth { get; set; } = 150;

        [Parameter]
        public double rectHeight { get; set; } = 60;
        [Parameter]
        public double initRadius { get; set; } = 25;
        [Parameter]
        public double EndRadius { get; set; } = 25;
        [Parameter]
        public double hSeparation { get; set; } = 40;

        int rectFontSize { get; set; } = 18;

        
        public List<entity.workflowDefine.Step> Steps { get; set; }

        
        public List<entity.workflowDefine.TrasferCondition> Transfers { get; set; }

        
        public List<entity.workflowDefine.Action> Actions { get; set; }

        
        public entity.workflowDefine.Workflow workflow { get; set; }

        internal class shapeNode
        {
            public int InCount { get; set; }

            public int OutCount { get; set; }
            public double x { get; set; }

            public double y { get; set; }

            public double width { get; set; }

            public double height { get; set; }

            /// <summary>
            /// 形状类型
            /// 0：圆
            /// 1：矩形
            /// 3: 虚拟
            /// </summary>
            public int Type { get; set; }

            public int Level { get; set; } = 1;

            public dynamic NodeObject { get; set; }

            public List<shapeNode> Childrens { get; set; }

            public List<shapeNode> Parents { get; set; }

        }

        private List<shapeNode> shapeTrees = null;

        private shapeNode FindNode(int stepId, out int Level, List<shapeNode> lstNodes)
        {

            Level = 1;
            foreach (var sNode in lstNodes)
            {
                if (sNode.NodeObject is entity.workflowDefine.Step && sNode.NodeObject.Id == stepId)
                {
                    return sNode;
                }
                else
                {
                    if (sNode.Childrens != null)
                    {
                        Level += 1;

                        var retObj = FindNode(stepId, out Level, sNode.Childrens);

                        if (retObj != null)
                        {
                            return retObj;
                        }
                    }

                }
            }

            return null;
        }

        private void GetShapeLevelNodes(Dictionary<int, List<shapeNode>> levelNodes, List<shapeNode> TreeNodes)
        {
            if (TreeNodes != null)
            {
                foreach (var sNode in TreeNodes)
                {
                    List<shapeNode> nodes = new List<shapeNode>();
                    if (levelNodes.ContainsKey(sNode.Level))
                    {
                        nodes = levelNodes[sNode.Level];
                        nodes.Add(sNode);
                    }
                    else
                    {
                        nodes.Add(sNode);
                        levelNodes.Add(sNode.Level, nodes);
                    }

                    GetShapeLevelNodes(levelNodes, sNode.Childrens);
                }
            }
        }

        shapeNode startNode;
        shapeNode InitShape;
        shapeNode endNode;
        Dictionary<int, List<shapeNode>> LevelNodes = new Dictionary<int, List<shapeNode>>();

        private void initShapeTree()
        {
            shapeTrees = new List<shapeNode>();
            LevelNodes = new Dictionary<int, List<shapeNode>>();
            startNode = new shapeNode()
            {
                //NodeObject = workflow.InitAction,
                InCount = 0,
                OutCount = 0,
                width = 2 * initRadius,
                height = 2 * initRadius,
                Level = 0
            };
            InitShape = new shapeNode()
            {
                NodeObject = workflow.InitAction,
                InCount = 0,
                OutCount = 0,
                Type = 1,
                Level = 1
            };

            startNode.Childrens = new List<shapeNode>();
            startNode.Childrens.Add(InitShape);

            InitShape.Parents = new List<shapeNode>();
            InitShape.Parents.Add(startNode);

            endNode = new shapeNode()
            {
                InCount = 0,
                OutCount = 0,
                height = 2 * EndRadius,
                width = 2 * EndRadius
            };

            shapeTrees.Add(startNode);
            

            #region 将步骤对象生成形状Node并添加到列表中
            if (Steps == null || Steps.Count == 0 || Steps.FirstOrDefault(s => s.Id == workflow.EndStepId) == null)
            {
                InitShape.Childrens = new List<shapeNode>();
                InitShape.Childrens.Add(endNode);
                InitShape.OutCount += 1;
                endNode.Parents = new List<shapeNode>();
                endNode.Parents.Add(InitShape);
                endNode.InCount += 1;
                endNode.Level = InitShape.Level + 1;
            }
            
                foreach (var step in Steps)
                {
                    var temNode = new shapeNode() { NodeObject = step, InCount = 0, OutCount = 0, Type = 1 };

                    if (workflow.EndStepId == step.Id)
                    {
                        temNode.Childrens = new List<shapeNode>();
                        temNode.Childrens.Add(endNode);
                        endNode.Parents = new List<shapeNode>();
                        endNode.Parents.Add(temNode);
                    }

                    shapeTrees.Add(temNode);
                }
            #endregion

            #region 遍历转移条件，生成流程树
            if (Transfers != null)
            {
                foreach (var transfer in Transfers)
                {
                    var FromNode = InitShape;
                    int FromLevel = 0;

                    if (transfer.StepId != null)
                    {
                        FromNode = FindNode(transfer.StepId.Value, out FromLevel, shapeTrees);
                    }

                    int ToLevel = 0;
                    var ToNode = FindNode(transfer.nextStepId, out ToLevel, shapeTrees);

                    if (FromNode.Childrens == null)
                    {
                        FromNode.Childrens = new List<shapeNode>();
                    }
                    FromNode.Childrens.Add(ToNode);

                    if (ToNode.Parents == null)
                    {
                        ToNode.Parents = new List<shapeNode>();
                    }
                    ToNode.Parents.Add(FromNode);

                    FromNode.OutCount += 1;
                    ToNode.InCount += 1;

                    if (FromNode.Level >= ToLevel)
                    {
                        ToNode.Level = FromNode.Level + 1;
                    }

                    if (shapeTrees.Contains(ToNode))
                    {

                        shapeTrees.Remove(ToNode);
                    }
                }

                endNode.Level = endNode.Parents[0].Level + 1;
            }
            #endregion



            GetShapeLevelNodes(LevelNodes, shapeTrees);

            #region 添加跨层连接的中间层的虚拟节点
            //foreach (int level in LevelNodes.Keys)
            //{
            //    foreach (var temNode in LevelNodes[level])
            //    {
            //        if (temNode.Childrens != null)
            //        {
            //            foreach (var temChildrenNode in temNode.Childrens)
            //            {
            //                if ((temChildrenNode.Level - temNode.Level) > 1)
            //                {
            //                    temNode.Childrens.Remove(temChildrenNode);
            //                    temChildrenNode.Parents.Remove(temNode);

            //                    var parentNode = temNode;

            //                    for (int iLevel = temNode.Level + 1; iLevel < temChildrenNode.Level; iLevel++)
            //                    {
            //                        var xnNode = new shapeNode() { Type = 3, Parents = new List<shapeNode>(), Childrens = new List<shapeNode>() };
            //                        parentNode.Childrens.Add(xnNode);
            //                        xnNode.Parents = new List<shapeNode>();
            //                        xnNode.Parents.Add(parentNode);
            //                        parentNode = xnNode;
            //                    }

            //                    parentNode.Childrens.Add(temChildrenNode);
            //                    temChildrenNode.Parents.Add(parentNode);
            //                }
            //            }
            //        }
            //    }
            //}
            #endregion

            int MaxNodeLevel = 0;
            int NodeCount = 0;


            foreach (int level in LevelNodes.Keys)
            {
                if (level > 1)
                {
                    int temLevelCount = 0;

                    foreach (var temNode in LevelNodes[level])
                    {
                        int graterInOrOut = (temNode.OutCount > temNode.InCount) ? temNode.OutCount : temNode.InCount;
                        if (graterInOrOut <= 1)
                        {
                            temLevelCount += 1;
                        }
                        else
                        {
                            temLevelCount += graterInOrOut;
                        }
                    }

                    if (temLevelCount > MaxNodeLevel)
                    {
                        MaxNodeLevel = level;
                        NodeCount = temLevelCount;
                    }
                }
            }

            #region 每层节点排序
            // 2.1. sort out each layer by looking at where it connects from
            for (var i = 1; i < LevelNodes.Count; ++i)
            {
                var top_layer = LevelNodes[i - 1];

                LevelNodes[i] = LevelNodes[i].OrderBy(node =>
                {
                    // calculate average position based on connected nodes in top layer
                    if (node.Parents == null)
                    {
                        return 0;
                    }

                    var connected_nodes = node.Parents
                        .Where(l => l.Level == (i - 1)).ToList();

                    if (!connected_nodes.Any())
                    {
                        return 0;
                    }
                    var average_index = connected_nodes.Select(cn => { var i = top_layer.IndexOf(cn); return i; }).Average();
                    return average_index;
                }).ToList();
            }

            // 2.2. now that all but the first layer are layed out, let's deal with the first
            if (LevelNodes.Count > 1)
            {
                LevelNodes[0] = LevelNodes[0].OrderBy(node =>
                {
                    // calculate average position based on connected nodes in top layer
                    var connected_nodes = node.Childrens
                        .Where(l => l.Level == 1)
                        .ToList();

                    if (!connected_nodes.Any())
                    {
                        return 0;
                    }
                    var average_index = connected_nodes.Select(cn => { var i = LevelNodes[1].IndexOf(cn); return i; }).Average();
                    return average_index;
                }).ToList();
            }
            #endregion

            ArrangeNodesInRows(LevelNodes);

            
        }

        private void ArrangeNodesInRows(Dictionary<int, List<shapeNode>> LevelNodes)
        {


            double preBotton = TitleHeight;
            for (int iLevel = 0; iLevel < LevelNodes.Count; iLevel++)
            {
                int iCount = 0;
                foreach (var node in LevelNodes[iLevel])
                {
                    int max = (node.InCount > node.OutCount) ? node.InCount : node.OutCount;
                    if (max == 0)
                    {
                        max = 1;
                    }
                    iCount += max;
                }

                double onNodeWidth = ChartWidth / (iCount + 1);

                iCount = 0;
                double maxHeight = 0;
                foreach (var node in LevelNodes[iLevel])
                {


                    int max = (node.InCount > node.OutCount) ? node.InCount : node.OutCount;
                    if (max == 0)
                    {
                        max = 1;
                    }

                    node.x = onNodeWidth * (iCount + 1) + (max - 1) * onNodeWidth / 2;
                    if (node.Type == 0)
                    {
                        node.width = 2 * initRadius;
                        node.height = 2 * initRadius;
                    }
                    else
                    {
                        node.width = rectWidth;
                        node.height = rectHeight;
                    }
                    iCount += max;

                    if (node.height > maxHeight)
                    {
                        maxHeight = node.height;
                    }
                }

                foreach (var node in LevelNodes[iLevel])
                {
                    node.y = preBotton + hSeparation + maxHeight / 2;
                }

                preBotton = preBotton + hSeparation + maxHeight;
            }


        }

        public dynamic GetLineParater(entity.workflowDefine.TrasferCondition trasferCondition)
        {
            int level = 0;
            var startNode = InitShape;
            if (trasferCondition.StepId != null)
            {
                startNode = FindNode(trasferCondition.StepId.Value, out level, shapeTrees);
            }
            var endNode = FindNode(trasferCondition.nextStepId, out level, shapeTrees);

            dynamic ret = new ExpandoObject();
            ret.x1 = startNode.x;
            ret.y1 = startNode.y + startNode.height / 2;

            ret.x2 = endNode.x;
            ret.y2 = endNode.y - endNode.height / 2;

            return ret;
        }

        public dynamic GetEndStepLine()
        {
            var startNode = endNode.Parents[0];
            dynamic ret = new ExpandoObject();
            ret.x1 = startNode.x;
            ret.y1 = startNode.y + startNode.height / 2;

            ret.x2 = endNode.x;
            ret.y2 = endNode.y - endNode.height / 2;

            return ret;
        }

        

        public void Refresh()
        {
            System.Text.Json.JsonSerializer.Serialize(Actions);
            initShapeTree();
            
        }

        void ClickStep(entity.workflowDefine.Step step)
        {

        }

        void ClickTrasfer(entity.workflowDefine.TrasferCondition trasferCondition)
        {

        }

        void InitAction()
        {

        }

        void ClickNode(shapeNode node)
        {

        }


    }

}