namespace Cis.Core;

/// <summary>
/// 分页泛型集合
/// </summary>
/// <typeparam name="TEntity"></typeparam>
public class SqlSugarPagedList<TEntity>
	where TEntity : new()
{
	/// <summary>
	/// 页码
	/// </summary>
	public int Page { get; set; }

	/// <summary>
	/// 页容量
	/// </summary>
	public int PageSize { get; set; }

	/// <summary>
	/// 总条数
	/// </summary>
	public int Total { get; set; }

	/// <summary>
	/// 总页数
	/// </summary>
	public int TotalPages { get; set; }

	/// <summary>
	/// 当前页集合
	/// </summary>
	public IEnumerable<TEntity> Items { get; set; }

	/// <summary>
	/// 是否有上一页
	/// </summary>
	public bool HasPrevPage { get; set; }

	/// <summary>
	/// 是否有下一页
	/// </summary>
	public bool HasNextPage { get; set; }
}

/// <summary>
/// 分页拓展类
/// </summary>
public static class SqlSugarPagedExtensions
{
	/// <summary>
	/// 分页拓展
	/// </summary>
	/// <param name="entity"></param>
	/// <param name="pageIndex"></param>
	/// <param name="pageSize"></param>
	/// <returns></returns>
	public static SqlSugarPagedList<TEntity> ToPagedList<TEntity>(this ISugarQueryable<TEntity> entity, int pageIndex, int pageSize)
		where TEntity : new()
	{
		var total = 0;
		var items = entity.ToPageList(pageIndex, pageSize, ref total);
		var totalPages = (int)Math.Ceiling(total / (double)pageSize);
		return new SqlSugarPagedList<TEntity>
		{
			Page = pageIndex,
			PageSize = pageSize,
			Items = items,
			Total = total,
			TotalPages = totalPages,
			HasNextPage = pageIndex < totalPages,
			HasPrevPage = pageIndex - 1 > 0
		};
	}

	/// <summary>
	/// 分页拓展
	/// </summary>
	/// <param name="entity"></param>
	/// <param name="pageIndex"></param>
	/// <param name="pageSize"></param>
	/// <returns></returns>
	public static async Task<SqlSugarPagedList<TEntity>> ToPagedListAsync<TEntity>(this ISugarQueryable<TEntity> entity, int pageIndex, int pageSize)
		where TEntity : new()
	{
		RefAsync<int> total = 0;
		var items = await entity.ToPageListAsync(pageIndex, pageSize, total);
		var totalPages = (int)Math.Ceiling(total / (double)pageSize);
		return new SqlSugarPagedList<TEntity>
		{
			Page = pageIndex,
			PageSize = pageSize,
			Items = items,
			Total = total,
			TotalPages = totalPages,
			HasNextPage = pageIndex < totalPages,
			HasPrevPage = pageIndex - 1 > 0
		};
	}
}