parking-webapi/WebApi_data_value/Services/ExcelGenerationService.cs

using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using ClosedXML.Excel;
using Microsoft.EntityFrameworkCore;
using Parking_space_WebAPI.Models;

namespace Parking_space_WebAPI.Services
{
    public class ExcelGenerationService
    {
        private readonly SqlContext _context;
        private readonly string _excelDirectory;

        public ExcelGenerationService(SqlContext context)
        {
            _context = context;
            _excelDirectory = @"C:\Users\ste92\Desktop\parking-e\excel"; // 設定 Excel 檔案存儲路徑
        }

        public async Task GenerateDailyExcel()
        {
            DateTime today = DateTime.Today;

            // 查詢當天的停車紀錄，按小時分組
            var parkingLogs = await _context.ParkingLogs
                .Where(p => p.Timestamp.Date == today)
                .GroupBy(p => new { p.Timestamp.Year, p.Timestamp.Month, p.Timestamp.Day, p.Timestamp.Hour })
                .Select(g => new
                {
                    Timestamp = new DateTime(g.Key.Year, g.Key.Month, g.Key.Day, g.Key.Hour, 0, 0),
                    TotalParkingSpaces = g.First().TotalParkingSpaces, // 取每小時第一筆的總車位
                    RemainingSpaces = g.First().RemainingSpaces,       // 取每小時第一筆的剩餘車位
                    MonthlyRentSpaces = g.First().MonthlyRentSpaces,   // 取每小時第一筆的月租車位
                    TemporaryRentSpaces = g.First().TemporaryRentSpaces // 取每小時第一筆的臨停車位
                })
                .ToListAsync();

            if (parkingLogs.Count == 0)
            {
                // 如果當天沒有紀錄，可以選擇不生成檔案或進行其他處理
                return;
            }

            using (var workbook = new XLWorkbook())
            {
                var worksheet = workbook.Worksheets.Add("當天停車紀錄");
                worksheet.Cell(1, 1).Value = "時間";
                worksheet.Cell(1, 2).Value = "總車位";
                worksheet.Cell(1, 3).Value = "剩餘車位";
                worksheet.Cell(1, 4).Value = "月租車位";
                worksheet.Cell(1, 5).Value = "臨停車位";
                worksheet.Cell(1, 6).Value = "生成日期";
                worksheet.Cell(2, 6).Value = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss dddd"); // 填入當前生成時間

                for (int i = 0; i < parkingLogs.Count; i++)
                {
                    var log = parkingLogs[i];
                    worksheet.Cell(i + 2, 1).Value = log.Timestamp.ToString("yyyy/MM/dd HH:mm:ss");
                    worksheet.Cell(i + 2, 2).Value = log.TotalParkingSpaces;
                    worksheet.Cell(i + 2, 3).Value = log.RemainingSpaces;
                    worksheet.Cell(i + 2, 4).Value = log.MonthlyRentSpaces;
                    worksheet.Cell(i + 2, 5).Value = log.TemporaryRentSpaces;
                }

                // 設定欄位寬度
                worksheet.Column(1).Width = 25;
                worksheet.Column(2).Width = 15;
                worksheet.Column(3).Width = 15;
                worksheet.Column(4).Width = 15;
                worksheet.Column(5).Width = 15;
                worksheet.Column(6).Width = 25;

                // 生成檔案名稱
                string fileName = $"整天車位數-{today:yyyy-MM-dd-dddd}.xlsx";

                // 儲存檔案
                var filePath = Path.Combine(_excelDirectory, fileName);
                workbook.SaveAs(filePath);
            }
        }


    }
}