using System;
using System.Collections.Generic;

namespace Masuit.Tools.Models;

/// <summary>
/// 分页集合
/// </summary>
/// <typeparam name="T"></typeparam>
public class PagedList<T>
{
    /// <summary>
    /// 数据集
    /// </summary>
    public List<T> Data { get; }

    /// <summary>
    /// 当前页
    /// </summary>
    public int CurrentPage { get; set; }

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

    /// <summary>
    /// 页大小
    /// </summary>
    public int PageSize { get; }

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

    /// <summary>
    /// 当前页数据条数
    /// </summary>
    public int CurrentCount => Data.Count;

    /// <summary>
    /// 是否有前一页
    /// </summary>
    public bool HasPrev => CurrentPage > 1;

    /// <summary>
    /// 是否有后一页
    /// </summary>
    public bool HasNext => CurrentPage < TotalPages;

    /// <summary>
    /// 分页数据
    /// </summary>
    /// <param name="items">数据集</param>
    /// <param name="page">当前页</param>
    /// <param name="size">页大小</param>
    /// <param name="count">总条数</param>
    public PagedList(List<T> items, int page, int size, int count)
    {
        TotalCount = count;
        PageSize = size;
        CurrentPage = page;
        TotalPages = (int)Math.Ceiling(count * 1.0 / size);
        Data = items;
    }

    public PagedList()
    {
    }
}