using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Dynamic.Core;
using System.Threading.Tasks;
using SqlSugar;
using Tiobon.Core.Common;
using Tiobon.Core.Common.DB;
using Tiobon.Core.Common.Extensions;
using Tiobon.Core.Model.Models;
namespace Tiobon.Core.DataAccess;

/// <summary>
/// 报表辅助类
/// </summary>
public static class ReportHelper
{

    #region 文件下载
    /// <summary>
    /// 生成文件，并通知用户下载(IQueryable)
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="list"></param>
    /// <param name="modelName">导出模块名称(JobSetting.xxx)</param>
    /// <param name="exportFields"></param>
    /// <param name="exportFieldsWidth"></param>
    /// <param name="user"></param>
    /// <param name="sort"></param>
    /// <param name="headText"></param>
    /// <param name="totalText"></param>
    /// <param name="isNeedItemNo"></param>
    public static async Task<long> SendFile<T>(IQueryable<T> list, string modelName, List<string> exportFields, List<int> exportFieldsWidth, string sort = null, string headText = "", string totalText = "", bool isNeedItemNo = false) where T : class
    {

        if (list == null)
            throw new Exception("生成文件失败");
        //生成文件至文件服务器
        var fid = SnowFlakeSingle.Instance.NextId();
        var path = $"{$"{Environment.CurrentDirectory}{Path.DirectorySeparatorChar}wwwroot{Path.DirectorySeparatorChar}files{Path.DirectorySeparatorChar}export{Path.DirectorySeparatorChar}{fid}{Path.DirectorySeparatorChar}"}";
        if (!Directory.Exists(path))
            Directory.CreateDirectory(path);
        var fname = $"{modelName}.xlsx";

        list = string.IsNullOrEmpty(sort) ? list : list.OrderBy(sort);
        list.IntoFileFromLinqExcel(path + fname, ",", exportFields, exportFieldsWidth, headText, totalText, isNeedItemNo);

        using var _context = ContextFactory.CreateContext();

        Ghre_Attachment fileAttachment = new Ghre_Attachment();
        fileAttachment.Id = fid;
        fileAttachment.AttachFileName = fname;
        fileAttachment.CreateBy = App.User.ID;
        fileAttachment.CreateTime = DateTime.Now;
        fileAttachment.AttachmentName = fname;
        fileAttachment.AttachFileExtension = "xlsx";
        fileAttachment.AttachFileSize = 0;
        fileAttachment.PhysicsPath = $"/files/export/{fid}/" + fname;
        fileAttachment.AttachmentType = "xlsx";

        await _context.Ghre_Attachment.AddAsync(fileAttachment);
        await _context.SaveChangesAsync();
        return fid;
    }
    #endregion

}