using System.Linq;
using System.Text;

using Autodesk.Revit.DB;

using EPPlus.Core.Extensions.Attributes;

namespace Szmedi.RvKits.ModelManager
{
    // ==========================================
    // 1. 数据模型定义 (Models)
    // ==========================================

    public enum DiffType { Added, Deleted, Modified }

    public class LocationDetail
    {
        public string OldValue { get; set; } // 修改前的坐标 (新增时为null)
        public string NewValue { get; set; } // 修改后的坐标 / 新增时的当前坐标
    }

    public class ParamDetail
    {
        public string ParamName { get; set; }
        public string OldValue { get; set; }
        public string NewValue { get; set; }

        public ParamDetail(string name, string oldVal, string newVal)
        {
            ParamName = name;
            OldValue = oldVal;
            NewValue = newVal;
        }
    }
    /// <summary>
    /// 构件状态快照 (对应 Excel 表格中的半边数据)
    /// </summary>
    public class ComponentState
    {
        public string ElementId { get; set; } = "无";
        public string TypeName { get; set; } = "无";
        public string DesignProps { get; set; } = "无";  // 设计属性 (多行文本)
        public string QuantityProps { get; set; } = "无"; // 出量属性 (体积/面积)
        public string Coordinates { get; set; } = "无";  // 坐标 (X/Y/Z)

        public bool IsEmpty => ElementId == "无";
    }

    /// <summary>
    /// 报表行数据
    /// </summary>
    public class ReportRow
    {
        public int Index { get; set; }
        public string ChangeType { get; set; } // 新增/删除/修改
        public ComponentState After { get; set; } = new ComponentState();  // 变更后
        public ComponentState Before { get; set; } = new ComponentState(); // 变更前
    }
    public class ElementDiffInfo
    {
        [ExcelTableColumn("图元ID")]
        public ElementId ElementId { get; set; }
        public string UniqueId { get; set; }
        public string CategoryName { get; set; }
        [ExcelTableColumn("类型")]
        public string Name { get; set; } // 族名称或类型名称
        [ExcelTableColumn("修改类型")]
        public DiffType Status { get; set; }

        // 位置变更详情 (新增或修改)
        [ExcelTableColumn("坐标")]
        public LocationDetail LocationChange { get; set; }

        [ExcelTableColumn("设计属性")]
        // 参数变更详情列表
        public List<ParamDetail> ParamChanges { get; set; } = new List<ParamDetail>();
        [ExcelTableColumn("出量属性")]
        public string CalculatedParameter { get; set; }
        public bool HasChanges => LocationChange != null || ParamChanges.Count > 0;
    }

    // ==========================================
    // 2. 核心对比逻辑 (ProjectComparer)
    // ==========================================

    public class ProjectComparerTest
    {
        private List<string> _targetParams;
        private const double Tolerance = 0.0001; // 几何容差 (英尺)

        public ProjectComparerTest(List<string> targetParams)
        {
            _targetParams = targetParams;
        }

        public List<ElementDiffInfo> CompareDocuments(Document oldDoc, Document newDoc)
        {
            var results = new List<ElementDiffInfo>();

            // 1. 获取构件字典，使用 UniqueId 进行匹配
            var oldMap = GetElementMap(oldDoc);
            var newMap = GetElementMap(newDoc);

            // 2. 遍历新文档 -> 检查 [新增] 和 [修改]
            foreach (var kvp in newMap)
            {
                string uid = kvp.Key;
                Element newElem = kvp.Value;

                if (!oldMap.ContainsKey(uid))
                {
                    // ================= [新增] =================
                    var diffInfo = new ElementDiffInfo
                    {
                        ElementId = newElem.Id,
                        UniqueId = uid,
                        CategoryName = newElem.Category?.Name,
                        Name = newElem.Name,
                        Status = DiffType.Added
                    };

                    // 获取坐标：优先定位点，其次包围盒底部中心
                    string locStr = GetSmartCoordinate(newElem);
                    if (!string.IsNullOrEmpty(locStr))
                    {
                        // 新增时，将坐标存入 NewValue
                        diffInfo.LocationChange = new LocationDetail
                        {
                            OldValue = null,
                            NewValue = locStr
                        };
                    }

                    results.Add(diffInfo);
                }
                else
                {
                    // ================= [修改] =================
                    Element oldElem = oldMap[uid];

                    // A. 检查位置 (仅检查 LocationPoint 类型的变化)
                    LocationDetail locDiff = CheckPointLocationChange(oldElem, newElem);

                    // B. 检查参数 (包含 Name 和 用户自定义参数)
                    List<ParamDetail> paramDiffs = CheckParamChanges(oldElem, newElem);

                    // 只有当 位置变了 或 参数变了 时才记录
                    if (locDiff != null || paramDiffs.Count > 0)
                    {
                        results.Add(new ElementDiffInfo
                        {
                            ElementId = newElem.Id,
                            UniqueId = uid,
                            CategoryName = newElem.Category?.Name,
                            Name = newElem.Name,
                            Status = DiffType.Modified,
                            LocationChange = locDiff, // 包含 OldValue 和 NewValue
                            ParamChanges = paramDiffs
                        });
                    }
                }
            }

            // 3. 遍历旧文档 -> 检查 [删除]
            foreach (var kvp in oldMap)
            {
                if (!newMap.ContainsKey(kvp.Key))
                {
                    // ================= [删除] =================
                    results.Add(new ElementDiffInfo
                    {
                        ElementId = kvp.Value.Id,
                        UniqueId = kvp.Key,
                        CategoryName = kvp.Value.Category?.Name,
                        Name = kvp.Value.Name,
                        Status = DiffType.Deleted
                    });
                }
            }

            return results;
        }

        // --------------------------------------------------------
        // 辅助方法区域
        // --------------------------------------------------------

        /// <summary>
        /// 智能获取构件坐标 (用于新增构件的定位描述)
        /// </summary>
        private string GetSmartCoordinate(Element elem)
        {
            XYZ p = null;

            // 策略1: 如果是基于点的构件 (柱、门、窗、家具等)
            if (elem.Location is LocationPoint lp)
            {
                p = lp.Point;
            }
            // 策略2: 如果是基于线或轮廓的构件 (墙、梁、楼板)，取包围盒底部中心
            else
            {
                BoundingBoxXYZ box = elem.get_BoundingBox(null);
                if (box != null)
                {
                    double cx = (box.Min.X + box.Max.X) / 2.0;
                    double cy = (box.Min.Y + box.Max.Y) / 2.0;
                    double cz = box.Min.Z; // 底部 Z
                    p = new XYZ(cx, cy, cz);
                }
            }

            return p != null ? FormatPoint(p) : "";
        }

        /// <summary>
        /// 检查位置变化 (严格模式：仅检查 Point 类型)
        /// </summary>
        private LocationDetail CheckPointLocationChange(Element oldElem, Element newElem)
        {
            // 只有当两个版本都是 LocationPoint 时才对比位置
            // 避免对比墙体等 LocationCurve 导致的复杂性
            if (oldElem.Location is LocationPoint lpOld && newElem.Location is LocationPoint lpNew)
            {
                // 1. 比较坐标
                bool posChanged = !lpOld.Point.IsAlmostEqualTo(lpNew.Point, Tolerance);

                // 2. 比较旋转 (如果不关心旋转可注释掉)
                bool rotChanged = Math.Abs(lpOld.Rotation - lpNew.Rotation) > Tolerance;

                if (posChanged || rotChanged)
                {
                    return new LocationDetail
                    {
                        OldValue = FormatPoint(lpOld.Point),
                        NewValue = FormatPoint(lpNew.Point)
                    };
                }
            }
            return null; // 无变化或不支持的定位类型
        }

        /// <summary>
        /// 检查参数变化 (包含构件名和自定义参数)
        /// </summary>
        private List<ParamDetail> CheckParamChanges(Element oldElem, Element newElem)
        {
            var list = new List<ParamDetail>();

            // 1. 检查构件名 (Name)
            if (oldElem.Name != newElem.Name)
            {
                list.Add(new ParamDetail("构件名", oldElem.Name, newElem.Name));
            }

            // 2. 检查自定义参数
            foreach (var paramName in _targetParams)
            {
                string vOld = GetParamValueString(oldElem, paramName);
                string vNew = GetParamValueString(newElem, paramName);

                if (vOld != vNew)
                {
                    list.Add(new ParamDetail(paramName, vOld, vNew));
                }
            }

            return list;
        }

        /// <summary>
        /// 获取参数值的安全字符串形式
        /// </summary>
        private string GetParamValueString(Element elem, string paramName)
        {
            Parameter p = elem.LookupParameter(paramName);
            if (p == null) return "<null>"; // 或者返回 ""

            // 优先返回用户可见的格式化字符串 (如 "1200 mm")
            if (p.StorageType == StorageType.String)
                return p.AsString() ?? "";

            string val = p.AsValueString();
            if (!string.IsNullOrEmpty(val)) return val;

            // 如果 AsValueString 为空，读取底层数据
            switch (p.StorageType)
            {
                case StorageType.Integer: return p.AsInteger().ToString();
                case StorageType.Double: return p.AsDouble().ToString("F2");
                case StorageType.ElementId: return p.AsElementId().ToString();
                default: return "";
            }
        }

        /// <summary>
        /// 获取需要对比的构件集合
        /// </summary>
        private Dictionary<string, Element> GetElementMap(Document doc)
        {
            // 过滤规则：非类型、非视图相关、有材质(通常代表实体)
            return new FilteredElementCollector(doc)
                .WhereElementIsNotElementType()
                .WhereElementIsViewIndependent()
                .Where(e => e.Category != null && e.Category.HasMaterialQuantities)
                .ToDictionary(e => e.UniqueId);
        }

        /// <summary>
        /// 统一坐标格式化
        /// </summary>
        private string FormatPoint(XYZ p)
        {
            // 内部单位是英尺，如需毫米显示请在此处转换
            // 例如: double x = p.X * 304.8;
            return $"({p.X:F1}, {p.Y:F1}, {p.Z:F1})";
        }
    }

    public class ProjectComparer
    {
        public ProjectComparer(List<string> designParams, List<string> quantityParams)
        {
            this.designParams = designParams;
            this.quantityParams = quantityParams;
        }

        //设计参数
        private readonly List<string> designParams;


        // 配置：需要在“出量属性”栏显示的参数
        private readonly List<string> quantityParams;

        public List<ReportRow> CompareDocuments(Document oldDoc, Document newDoc)
        {
            var rows = new List<ReportRow>();
            var oldMap = GetElementMap(oldDoc);
            var newMap = GetElementMap(newDoc);

            int indexCounter = 1;

            // --- A. 遍历新文档 (查找 [新增] 和 [修改]) ---
            foreach (var kvp in newMap)
            {
                string uid = kvp.Key;
                Element newElem = kvp.Value;

                if (!oldMap.ContainsKey(uid))
                {
                    // === 新增构件 ===
                    rows.Add(new ReportRow
                    {
                        Index = indexCounter++,
                        ChangeType = "新增构件",
                        After = ExtractState(newElem),
                        Before = new ComponentState { ElementId = "无" } // 空状态
                    });
                }
                else
                {
                    // === 修改构件 ===
                    Element oldElem = oldMap[uid];

                    // 判断是否有实质性修改 (参数或位置)
                    if (IsElementModified(oldElem, newElem))
                    {
                        rows.Add(new ReportRow
                        {
                            Index = indexCounter++,
                            ChangeType = "修改构件",
                            After = ExtractState(newElem),
                            Before = ExtractState(oldElem)
                        });
                    }
                }
            }

            // --- B. 遍历旧文档 (查找 [删除]) ---
            foreach (var kvp in oldMap)
            {
                if (!newMap.ContainsKey(kvp.Key))
                {
                    // === 删除构件 ===
                    rows.Add(new ReportRow
                    {
                        Index = indexCounter++,
                        ChangeType = "删除构件",
                        After = new ComponentState { ElementId = "无" }, // 空状态
                        Before = ExtractState(kvp.Value)
                    });
                }
            }

            return rows;
        }

        // --- 提取构件信息为状态对象 ---
        private ComponentState ExtractState(Element e)
        {
            var state = new ComponentState
            {
                ElementId = e.Id.ToString(),
                TypeName = e.Name // 这里的Name通常是族类型名称
            };

            // 1. 提取设计属性 (拼接成换行字符串)
            var sbDesign = new StringBuilder();
            foreach (var paramName in designParams)
            {
                string val = GetParamValue(e, paramName);
                if (!string.IsNullOrEmpty(val))
                {
                    // Excel 单元格内换行使用 Environment.NewLine
                    sbDesign.AppendLine($"{paramName}: {val}");
                }
            }
            state.DesignProps = sbDesign.Length > 0 ? sbDesign.ToString().TrimEnd() : "";

            // 2. 提取出量属性
            var sbQty = new StringBuilder();
            foreach (var paramName in quantityParams)
            {
                string val = GetParamValue(e, paramName);
                // 排除 0.00 的情况
                if (!string.IsNullOrEmpty(val) && val != "0.00" && val != "0")
                {
                    sbQty.AppendLine($"{paramName}: {val}");
                }
            }
            state.QuantityProps = sbQty.Length > 0 ? sbQty.ToString().TrimEnd() : "";

            // 3. 提取坐标 (竖排显示)
            state.Coordinates = GetFormattedCoordinates(e);

            return state;
        }

        // --- 辅助：坐标格式化 (核心逻辑：有定位点取点，没点取包围盒) ---
        private string GetFormattedCoordinates(Element e)
        {
            XYZ p = null;

            // 策略1: 基于点 (柱、门、窗、家具)
            if (e.Location is LocationPoint lp)
            {
                p = lp.Point;
            }
            // 策略2: 基于线或形状 (墙、梁、板) -> 取包围盒底部中心
            else
            {
                var box = e.get_BoundingBox(null);
                if (box != null)
                {
                    double cx = (box.Min.X + box.Max.X) / 2.0;
                    double cy = (box.Min.Y + box.Max.Y) / 2.0;
                    double cz = box.Min.Z;
                    p = new XYZ(cx, cy, cz);
                }
            }

            if (p == null) return "无";

            // 格式化为 Excel 竖排效果，并转换单位 (英尺 -> 毫米)
            double toMm = 304.8;
            return $"X: {(p.X * toMm):F2}\nY: {(p.Y * toMm):F2}\nZ: {(p.Z * toMm):F2}";
        }

        // --- 辅助：判断是否修改 ---
        private bool IsElementModified(Element oldE, Element newE)
        {
            // 1. 名字变了
            if (oldE.Name != newE.Name) return true;

            // 2. 坐标变了
            if (GetFormattedCoordinates(oldE) != GetFormattedCoordinates(newE)) return true;

            // 3. 关键参数变了 (可选：遍历 _designParams 检查)
            // 这里简单示例：如果提取出的设计属性字符串不一致，就算修改
            // 实际为了性能，建议在这里写单独的参数对比循环
            var s1 = ExtractState(oldE).DesignProps;
            var s2 = ExtractState(newE).DesignProps;
            if (s1 != s2) return true;

            return false;
        }

        // --- 辅助：获取参数值 ---
        private string GetParamValue(Element e, string name)
        {
            Parameter p = e.LookupParameter(name);
            if (p == null) return "";
            if (p.StorageType == StorageType.String) return p.AsString();
            return p.AsValueString(); // AsValueString 会带单位
        }

        // --- 辅助：获取元素字典 ---
        private Dictionary<string, Element> GetElementMap(Document doc)
        {
            return new FilteredElementCollector(doc)
                .WhereElementIsNotElementType()
                .WhereElementIsViewIndependent()
                .Where(e => e.Category != null && e.Category.HasMaterialQuantities) // 简单的实体过滤
                .ToDictionary(e => e.UniqueId);
        }
    }
}