using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using EPPlus.Core.Extensions;

using OfficeOpenXml;
using OfficeOpenXml.Style;

namespace Szmedi.RvKits.ModelManager
{
    public static class ReportGenerator
    {
        public static string Generate(List<ElementDiffInfo> results)
        {
            if (results == null || results.Count == 0) return "未发现构件差异。";

            StringBuilder sb = new StringBuilder();
            sb.AppendLine("=== Revit 版本对比报告 ===");

            // 1. 新增
            var added = results.Where(r => r.Status == DiffType.Added).ToList();
            if (added.Any())
            {
                sb.AppendLine($"\n【新增构件】: {added.Count}");
                foreach (var item in added)
                {
                    sb.Append($"  [+] ID:{item.ElementId} | {item.CategoryName}: {item.Name}");

                    // 如果 LocationChange 不为空，说明计算出了坐标
                    if (item.LocationChange != null && !string.IsNullOrEmpty(item.LocationChange.NewValue))
                    {
                        sb.Append($" @ {item.LocationChange.NewValue}");
                    }
                    sb.AppendLine();
                }
            }

            // 2. 修改
            var modified = results.Where(r => r.Status == DiffType.Modified).ToList();
            if (modified.Any())
            {
                sb.AppendLine($"\n【修改构件】: {modified.Count}");
                foreach (var item in modified)
                {
                    sb.AppendLine($"  [*] ID:{item.ElementId} | {item.CategoryName}: {item.Name}");

                    // 显示位置移动
                    if (item.LocationChange != null)
                    {
                        sb.AppendLine($"      [位置移动]");
                        sb.AppendLine($"          原: {item.LocationChange.OldValue}");
                        sb.AppendLine($"          新: {item.LocationChange.NewValue}");
                    }

                    // 显示参数变化
                    foreach (var p in item.ParamChanges)
                    {
                        sb.AppendLine($"      > {p.ParamName}: \"{p.OldValue}\" -> \"{p.NewValue}\"");
                    }
                    sb.AppendLine();
                }
            }

            // 3. 删除
            var deleted = results.Where(r => r.Status == DiffType.Deleted).ToList();
            if (deleted.Any())
            {
                sb.AppendLine($"\n【删除构件】: {deleted.Count}");
                foreach (var item in deleted)
                {
                    sb.AppendLine($"  [-] ID:{item.ElementId} | {item.CategoryName}: {item.Name}");
                }
            }

            return sb.ToString();
        }


        public static void ToExcel(string excelPath, List<ElementDiffInfo> infos)
        {
            FileInfo fi = new(excelPath);
            ExcelPackage package = infos.ToWorksheet("构件数量变动对比表")
                                           .WithConfiguration(cfg => cfg.WithColumnConfiguration(c => c.AutoFit()))
                                           .ToExcelPackage();

            package.SaveAs(fi);
        }

        public static void Export(List<ReportRow> data, string filePath)
        {
            var file = new FileInfo(filePath);
            if (file.Exists)
            {
                try { file.Delete(); }
                catch { throw new Exception("无法覆盖文件，请确保Excel已关闭。"); }
            }

            using (var package = new ExcelPackage(file))
            {
                var ws = package.Workbook.Worksheets.Add("构件对比表");

                // --- 1. 设置表头 (模仿图片样式) ---

                // 设置列宽
                ws.Column(1).Width = 6;  // 序号
                ws.Column(2).Width = 10; // 变更类型

                // 变更后 (3-7)
                ws.Column(3).Width = 10; // ID
                ws.Column(4).Width = 15; // 类型
                ws.Column(5).Width = 25; // 设计属性
                ws.Column(6).Width = 12; // 出量
                ws.Column(7).Width = 12; // 坐标

                // 变更前 (8-12)
                ws.Column(8).Width = 10;
                ws.Column(9).Width = 15;
                ws.Column(10).Width = 25;
                ws.Column(11).Width = 12;
                ws.Column(12).Width = 12;

                // 第一行：合并的大标题
                ws.Cells[1, 1].Value = "序号"; ws.Cells[1, 1, 2, 1].Merge = true;
                ws.Cells[1, 2].Value = "变更\n类型"; ws.Cells[1, 2, 2, 2].Merge = true;

                ws.Cells[1, 3].Value = "变更后构件"; ws.Cells[1, 3, 1, 7].Merge = true;
                ws.Cells[1, 8].Value = "变更前构件"; ws.Cells[1, 8, 1, 12].Merge = true;

                // 第二行：子标题
                string[] headers = { "图元ID", "类型", "设计属性", "出量属性", "坐标" };
                for (int i = 0; i < 5; i++)
                {
                    ws.Cells[2, 3 + i].Value = headers[i];
                    ws.Cells[2, 8 + i].Value = headers[i];
                }

                // 表头样式
                using (var range = ws.Cells[1, 1, 2, 12])
                {
                    range.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
                    range.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
                    range.Style.Font.Bold = true;
                    range.Style.Fill.PatternType = ExcelFillStyle.Solid;
                    range.Style.Fill.BackgroundColor.SetColor(Color.LightGray);
                    range.Style.Border.Top.Style = ExcelBorderStyle.Thin;
                    range.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
                    range.Style.Border.Left.Style = ExcelBorderStyle.Thin;
                    range.Style.Border.Right.Style = ExcelBorderStyle.Thin;
                    range.Style.WrapText = true; // 允许表头换行
                }

                // --- 2. 填充数据 ---
                int rowIdx = 3;

                foreach (var item in data)
                {
                    // 序号 & 类型
                    ws.Cells[rowIdx, 1].Value = item.Index;
                    ws.Cells[rowIdx, 2].Value = item.ChangeType;

                    // 设置变更类型颜色
                    var typeCell = ws.Cells[rowIdx, 2];
                    if (item.ChangeType.Contains("新增")) typeCell.Style.Font.Color.SetColor(Color.Green);
                    else if (item.ChangeType.Contains("删除")) typeCell.Style.Font.Color.SetColor(Color.Red);
                    else typeCell.Style.Font.Color.SetColor(Color.Blue);

                    // --- 变更后数据 (After) ---
                    if (item.After.IsEmpty)
                    {
                        // 如果为空，合并5列显示“无”
                        ws.Cells[rowIdx, 3].Value = "无";
                        ws.Cells[rowIdx, 3, rowIdx, 7].Merge = true;
                    }
                    else
                    {
                        FillData(ws, rowIdx, 3, item.After);
                    }

                    // --- 变更前数据 (Before) ---
                    if (item.Before.IsEmpty)
                    {
                        // 如果为空，合并5列显示“无”
                        ws.Cells[rowIdx, 8].Value = "无";
                        ws.Cells[rowIdx, 8, rowIdx, 12].Merge = true;
                    }
                    else
                    {
                        FillData(ws, rowIdx, 8, item.Before);
                    }

                    rowIdx++;
                }

                // --- 3. 全局样式调整 ---
                if (data.Count > 0)
                {
                    var dataRange = ws.Cells[3, 1, rowIdx - 1, 12];

                    // 边框
                    dataRange.Style.Border.Top.Style = ExcelBorderStyle.Thin;
                    dataRange.Style.Border.Bottom.Style = ExcelBorderStyle.Thin;
                    dataRange.Style.Border.Left.Style = ExcelBorderStyle.Thin;
                    dataRange.Style.Border.Right.Style = ExcelBorderStyle.Thin;

                    // 对齐
                    dataRange.Style.VerticalAlignment = ExcelVerticalAlignment.Center;
                    dataRange.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;

                    // 特殊列左对齐 (属性列)
                    ws.Cells[3, 5, rowIdx - 1, 5].Style.HorizontalAlignment = ExcelHorizontalAlignment.Left; // After Props
                    ws.Cells[3, 10, rowIdx - 1, 10].Style.HorizontalAlignment = ExcelHorizontalAlignment.Left; // Before Props
                    ws.Cells[3, 7, rowIdx - 1, 7].Style.HorizontalAlignment = ExcelHorizontalAlignment.Left; // After Coords
                    ws.Cells[3, 12, rowIdx - 1, 12].Style.HorizontalAlignment = ExcelHorizontalAlignment.Left; // Before Coords

                    // 开启自动换行 (关键，否则 \n 不生效)
                    dataRange.Style.WrapText = true;
                }

                package.Save();
            }
        }

        private static void FillData(ExcelWorksheet ws, int row, int col, ComponentState s)
        {
            ws.Cells[row, col].Value = s.ElementId;
            ws.Cells[row, col + 1].Value = s.TypeName;
            ws.Cells[row, col + 2].Value = s.DesignProps;
            ws.Cells[row, col + 3].Value = s.QuantityProps;
            ws.Cells[row, col + 4].Value = s.Coordinates;
        }

    }
}