ProjectLib/ProjectLibrary/Reports/TableReport.cs

using Microsoft.Extensions.Logging;
using ProjectLibrary.Entities;
using ProjectLibrary.Repositories;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ProjectLibrary.Reports;
    
public class TableReport
{
    private readonly IOrderRepository _orderRepository;
    private readonly ILogger<TableReport> _logger;
    internal static readonly string[] item = ["Id заказа","Дата заказа", "Дата возврата", "Книга", "Количество"];


    public TableReport(IOrderRepository orderRepository, ILogger<TableReport> logger)
    {
        _orderRepository = orderRepository ?? throw new ArgumentNullException(nameof(orderRepository));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    public bool CreateTable(string filePath, DateTime startDate, DateTime endDate)
    {
        try
        {
            new ExcelBuilder(filePath)
            .AddHeader("Сводка по движению книг", 0, 5)
            .AddParagraph("за период", 0)
            .AddTable([10, 10, 10, 15, 15], GetData(startDate, endDate))
            .Build();
            return true;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Ошибка при формировании документа");
            return false;
        }
    }

    private List<string[]> GetData(DateTime startDate, DateTime endDate)
    {
        var data = _orderRepository
            .ReadOrders()
            .Where(x => x.OrderDate >= startDate && x.OrderDate <= endDate && x.BookOrders.Any(y => y.OrderID == x.Id))
            .Select(x => new
            {
                x.Id,
                DateOrder = x.OrderDate,
                DateReturn = x.ReturnDate,
                Book = (int?)x.BookOrders.First(y => y.OrderID == x.Id).BookID,
                Count = (int?)x.BookOrders.First(y => y.OrderID == x.Id).Count
            })
            .OrderBy(x => x.DateOrder);
        return
        new List<string[]>() { item }
        .Union(
            data
            .Select(x => new string[] {  x.Id.ToString(), x.DateOrder.ToString(), x.DateReturn.ToString(),
                x.Book?.ToString() ?? string.Empty,  x.Count?.ToString() ?? string.Empty}))
        .Union([["Всего", "", "", "", data.Sum(x => x.Count ?? 0).ToString()]])
        .ToList();
    }
}