using Autodesk.Revit.DB;
using FWindSoft.Revit.Common;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FWindSoft.Revit
{
    public static class ConnectorSearchUtils
    {
        #region 获取直接相连接的元素
        /// <summary>
        /// 获取与connector相连接的元素，不包括自身
        /// </summary>
        /// <param name="connector"></param>
        /// <param name="allowConnector"></param>
        /// <returns></returns>
        public static List<Element> GetJoinElements(Connector connector,Predicate<Connector> allowConnector)
        {
            List<Element> joinElements = new List<Element>();
            Element element = connector.Owner;
            ConnectorSearchOptions options = new ConnectorSearchOptions() { AllowConnector = allowConnector };
            if (connector.Searchable())
            {
                ConnectorSet conSet = connector.AllRefs;
                foreach (var con in conSet.ToList())
                {
                    if (con.Owner.Id == element.Id)
                        continue;
                    if(options.ConnectorUsable(con))
                    {
                        joinElements.Add(con.Owner);
                    }
                }
            }
            return joinElements;
        }
        /// <summary>
        /// 获取与connector相连接的元素，不包括自身
        /// </summary>
        /// <param name="connector"></param>
        /// <returns></returns>
        public static List<Element> GetJoinElements(Connector connector)
        {
            return GetJoinElements(connector,null);
        }
        /// <summary>
        /// 获取关联元素
        /// </summary>
        /// <param name="sourceElement"></param>
        /// <param name="allowConnector"></param>
        /// <returns></returns>
        public static List<Element> GetJoinElements(Element sourceElement, Predicate<Connector> allowConnector)
        {
            IEnumerable<Element> joinElements = new List<Element>();
            Element element = sourceElement;
            ConnectorSearchOptions options = new ConnectorSearchOptions() { AllowConnector = allowConnector };
            var connectors = sourceElement.GetAllConnectors();
            foreach (var baseConnector in connectors)
            {
                if (!options.ConnectorUsable(baseConnector))
                {
                    continue;
                }
                var childJoinElements = GetJoinElements(baseConnector, allowConnector);
                joinElements=joinElements.Intersect(childJoinElements, new ElementEqualityComparer());
            }
            return joinElements.ToList();
        }
        /// <summary>
        /// 获取关联元素
        /// </summary>
        /// <param name="sourceElement"></param>
        public static List<Element> GetJoinElements(Element sourceElement)
        {
            return GetJoinElements(sourceElement, null);
        }
        #endregion
        #region 通过连接关系，找到满足条件的元素
        /// <summary>
        /// 根据连接关系，获取满足条件的元素
        /// </summary>
        /// <param name="inputElement"></param>
        /// <param name="inputConnector"></param>
        /// <param name="allowConnector"></param>
        /// <param name="endPredicate"></param>
        /// <returns></returns>
        public static List<Element> GetFirstMatchElements(Element inputElement, Connector inputConnector, Predicate<Connector> allowConnector, Predicate<Element> endPredicate)
        {
            var startElement = inputElement;
            ConnectorSearchOptions options = new ConnectorSearchOptions() { AllowConnector = allowConnector, AllowElement = endPredicate };
            List<Element> result = new List<Element>();
            List<Element> reference = new List<Element>();
            reference.Add(startElement);
            for (int i = 0; i < reference.Count; i++)
            {
                var currrentElement = reference[i];
                #region 获取可用连接件
                List<Connector> connectors = currrentElement.GetAllConnectors().ToList();
                if (inputConnector != null && i == 0)
                {
                    connectors = new List<Connector> { inputConnector };
                }
                else
                {
                    connectors = currrentElement.GetAllConnectors().ToList();
                }
                #endregion
                foreach (var con in connectors)
                {
                    if (!con.Searchable() || !options.ConnectorUsable(con))
                    {
                        continue;
                    }
                    List<Element> elements = GetJoinElements(con, allowConnector);
                    foreach (var element in elements)
                    {
                        if (options.ElementUsable(element))
                        {
                            if (result.All(e => e.Id != element.Id))
                            {
                                result.Add(element);
                            }
                        }
                        else
                        {
                            if (reference.All(e => e.Id != element.Id))
                            {
                                reference.Add(element);
                            }
                        }
                    }
                }
            }
            result.RemoveAll(r => r.Id.IntegerValue == startElement.Id.IntegerValue);
            return result;
        }
        /// <summary>
        /// 根据连接关系，获取满足条件的元素
        /// </summary>
        /// <param name="connector"></param>
        /// <param name="allowConnector"></param>
        /// <param name="endPredicate"></param>
        /// <returns></returns>
        public static List<Element> GetFirstMatchElements(Connector connector, Predicate<Connector> allowConnector, Predicate<Element> endPredicate)
        {
            return GetFirstMatchElements(connector.Owner, connector, allowConnector, endPredicate);
        }
        /// <summary>
        /// 根据连接关系，获取满足条件的元素
        /// </summary>
        /// <param name="inputElement"></param>
        /// <param name="allowConnector"></param>
        /// <param name="endPredicate"></param>
        /// <returns></returns>
        public static List<Element> GetFirstMatchElements(Element inputElement, Predicate<Connector> allowConnector, Predicate<Element> endPredicate)
        {
            return GetFirstMatchElements(inputElement,null, allowConnector, endPredicate);
        }

        /// <summary>
        /// 根据连接关系，获取指定类型的元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="startElement"></param>
        /// <param name="startConnector"></param>
        /// <returns></returns>
        public static List<T> GetFirstMatchElements<T>(this Element startElement,Connector startConnector = null) where T : Element
        {
            return GetFirstMatchElements(startElement, startConnector, null, e => e is T).OfType<T>().ToList();
        }

        #endregion

        #region 获取所有连接元素
        /// <summary>
        /// 获取与指定元素关联的所有元素
        /// </summary>
        /// <param name="element"></param>
        /// <returns></returns>
        public static List<Element> GetAllJoinElements(this Element element)
        {
            List<Element> elements = new List<Element>();
            element.GetAllJoinElements(ref elements, null);
            return elements;
        }
        public static List<Element> GetAllJoinElements(this Element element, Predicate<Element> ignoredElement)
        {
            List<Element> elements = new List<Element>();
            element.GetAllJoinElements(ref elements, ignoredElement);
            return elements;
        }
        /// <summary>
        /// 获取与元素通过connector相连接的元素
        /// </summary>
        /// <param name="sourceElement"></param>
        /// <param name="reference"></param>
        /// <param name="ignoredElement"></param>
        private static void GetAllJoinElements(this Element sourceElement, ref List<Element> reference, Predicate<Element> ignoredElement)
        {
            //就这样使用引用类型传入，不使用返回值形式，是避免数据转来转去拖慢算法速度
            reference.Add(sourceElement);
            var elements = GetJoinElements(sourceElement);
            foreach (var element in elements)
            {
                if (reference.Contains(element, new ElementEqualityComparer()))
                    continue;
                if (ignoredElement != null && ignoredElement(element))
                    continue;
                element.GetAllJoinElements(ref reference, ignoredElement);
            }
        }
        #endregion

        //以上为最终完善代码


        /// <summary>
        /// 获取单线Path
        /// </summary>
        /// <param name="startElement">起始元素</param>
        /// <param name="startConnector">指定元素上一点</param>
        /// <param name="breakCondition">断开约束条件</param>
        /// <returns></returns>
        public static List<Element> GetPathElements(this Element startElement, Connector startConnector, Predicate<Element> breakCondition)
        {
            /*
             * 获取元素以指定Connector开始的Path,单点相连情况，不分叉
             */
            return GetPathElements(startElement, startConnector, null, breakCondition);
        }
        /// <summary>
        /// 获取单线Path
        /// </summary>
        /// <param name="startElement">起始元素</param>
        /// <param name="startConnector">指定元素上一点</param>
        /// <param name="ignoredElement">忽略点位</param>
        /// <param name="breakCondition">断开约束条件</param>
        /// <returns></returns>
        public static List<Element> GetPathElements(this Element startElement, Connector startConnector, Predicate<Element> ignoredElement, Predicate<Element> breakCondition)
        {
            List<Element> useElements = new List<Element>() { startElement };
            Connector useConnector = startConnector;
            while (useConnector != null)
            {
                var joinElements = GetJoinElements(useConnector);
                if (joinElements.Count != 1)
                {
                    break;
                }
                var nextElement = joinElements[0];
                if (ignoredElement != null && ignoredElement(nextElement))
                {
                    break;
                }
                useElements.Add(nextElement);
                //如果原始集合中存在，如环路情况。则收尾元素相等；【理论上是只可能和第一个元素相等】
                if (startElement.Id == nextElement.Id)
                {
                    break;
                }
                if (breakCondition != null && breakCondition(nextElement))
                {
                    break;
                }
                var connectors = nextElement.GetAllConnectors();
                if (connectors.Count != 2)
                {
                    break;
                }
                var preElement = useConnector.Owner;
                useConnector = null;
                for (int i = 0; i < connectors.Count; i++)
                {
                    var element = connectors[i].GetJoinConnector()?.Owner;
                    if (element != null && element.Id != preElement.Id)
                    {
                        useConnector = connectors[i];
                        break;
                    }
                }
            }
            return useElements;
        }



        #region 元素之间路由相关
        /// <summary>
        /// 获取到指定条件的全部路径
        /// </summary>
        /// <param name="element"></param>
        /// <param name="endPedicate"></param>
        /// <returns></returns>
        public static List<ElementPath> GetRouteElements(this Element element, Predicate<Element> endPedicate)
        {
            List<Element> temp = new List<Element>();
            List<ElementPath> routed = new List<ElementPath>();
            routed = element.GetRouteElements(null, endPedicate, routed, ref temp);
            return routed;
        }
        /// <summary>
        /// 获取与指定connector连接的所有分支信息
        /// </summary>
        /// <param name="element"></param>
        /// <param name="connectorSpecify"></param>
        /// <returns></returns>
        public static List<ElementPath> GetRouteElements(this Element element, Connector connectorSpecify, Predicate<Element> endPedicate)
        {
            List<Element> temp = new List<Element>();
            List<ElementPath> routed = new List<ElementPath>();
            routed = element.GetRouteElements(null, endPedicate, routed, ref temp);
            return routed;
        }
        private static List<ElementPath> AppendElementPath(List<ElementPath> source, List<Element> elements)
        {
            ElementPath elementPath = new ElementPath();
            elementPath.AddRange(elements);
            if (source == null)
            {
                source = new List<ElementPath>();
            }
            if (!source.Any(rp => rp.Count == elementPath.Count && rp.IsMatch(elementPath)))
            {
                source.Add(elementPath);
            }
            return source;
        }

        private static List<ElementPath> GetRouteElements(this Element element, Connector connectorSpecify, Predicate<Element> endPedicate,
            List<ElementPath> oldElementRoutes, ref List<Element> result)
        {
            #region 描述

            /*
             * 遍历结束条件：1、指定的条件
             *                             2、最后端头点
             *                             3、遍历找回到自身
             *
             *返回新的路径值
            */

            #endregion
            var isEnd = result.Contains(element, new ElementEqualityComparer());
            result.Add(element);
            if (isEnd ||
                (result.Count > 1 && endPedicate != null && endPedicate.Invoke(element)))
            {
                //结束;如果result中只有一个元素，则为开始元素。开始元素满足限定的条件时，不退出遍历
                oldElementRoutes = AppendElementPath(oldElementRoutes, result);
            }
            else
            {
                //如果没有向下，递归项，则同样判定为路由寻址结束
                bool hasNext = false;
                Element preElement = null;
                if (result.Count > 1)
                {
                    preElement = result[result.Count - 2];//.LastOrDefault();
                }
                #region 连接点处理
                List<Connector> useConnectors = new List<Connector>();
                if (connectorSpecify != null)
                {
                    useConnectors.Add(connectorSpecify);
                }
                else
                {
                    useConnectors.AddRange(element.GetAllConnectors());
                }
                #endregion
                foreach (var connector in useConnectors)
                {
                    var elements = GetJoinElements(connector);
                    foreach (var joinElement in elements)
                    {
                        if (joinElement.Id == element.Id || (preElement != null && joinElement.Id == preElement.Id))
                            continue;
                        if (!hasNext)
                        {
                            hasNext = true;
                        }

                        joinElement.GetRouteElements(null, endPedicate, oldElementRoutes, ref result);
                        result.RemoveRange(result.Count - 1, 1);
                    }
                }
                if (!hasNext)
                {
                    oldElementRoutes = AppendElementPath(oldElementRoutes, result);
                }
            }
            return oldElementRoutes;
        }
        #endregion
    }
}