using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Dynamic.Core;
using SqlSugar;

namespace DS.Module.Core.Extensions;

public static partial class Extensions
{
    /// <summary>
    /// 多排序方法
    /// </summary>
    /// <typeparam name="TEntity">要排序实体</typeparam>
    /// <param name="source">源</param>
    /// <param name="orderConditions">排序条件</param>
    /// <returns></returns>
    public static ISugarQueryable<TEntity> OrderBy<TEntity>(this ISugarQueryable<TEntity> source,
        SortCondition[] orderConditions)
    {
        orderConditions.NotNull(nameof(orderConditions));
        string orderStr = string.Empty;

        foreach (SortCondition orderCondition in orderConditions)
        {
            orderStr = orderStr +
                       $"{orderCondition.SortField} {(orderCondition.ListSortDirection == ListSortDirection.Ascending ? "asc" : "desc")}, ";
        }

        orderStr = orderStr.TrimEnd(", ".ToCharArray());
        return source.OrderBy(orderStr);
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="source"></param>
    /// <param name="page"></param>
    /// <typeparam name="TEntity"></typeparam>
    /// <returns></returns>
    public static DataResult<List<TEntity>> ToQueryPage<TEntity>(this ISugarQueryable<TEntity> source, PageCondition page)
    {
        page.NotNull(nameof(page));

        var result = source.WhereAsync(page.PageIndex, page.PageSize, page.SortConditions);
        var list = result.data;
        var total = result.totalNumber;
        return DataResult<List<TEntity>>.PageList(total, list);
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="source"></param>
    /// <param name="pageIndex"></param>
    /// <param name="pageSize"></param>
    /// <param name="orderConditions"></param>
    /// <typeparam name="TEntity"></typeparam>
    /// <returns></returns>
    private static (List<TEntity> data, int totalNumber) WhereAsync<TEntity>(this ISugarQueryable<TEntity> source,
        int pageIndex,
        int pageSize, SortCondition[] orderConditions)
    {
        var total = source.Count();

        ISugarQueryable<TEntity> orderSource;
        if (orderConditions == null || orderConditions.Length == 0)
        {
            // orderSource = source.OrderBy("Id ascending");
            orderSource = source.OrderBy("Id");
            // orderSource = source.OrderBy("GID");
        }
        else
        {
            orderSource = source.OrderBy(orderConditions);
        }

        source = orderSource;

        return (
            source.Count()!=0
                ? source.ToPageList(pageIndex,pageSize,ref total)
                : Enumerable.Empty<TEntity>().ToList(), total);
    }
}