using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Pcb.Domain;

namespace Pcb.Common
{
    /// <summary>
    /// 分页显示类
    /// </summary>
    public class Pager
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="PageIndex">当前页</param>
        /// <param name="RecordCount"></param>
        /// <param name="PageSize"></param>
        /// <param name="UrlTemplate">网址({page}-被自动替换成页码)</param>
        public Pager(int PageIndex, int RecordCount, int PageSize, string UrlTemplate)
        {
            this.RecordCount = RecordCount;
            this.PageSize = PageSize;
            this.PageIndex = PageIndex;
            this.PageCount = (int)Math.Ceiling((float)RecordCount / PageSize);
            this.UrlTemplate = UrlTemplate;
        }
        /// <summary>
        /// 总记录数
        /// </summary>
        public int RecordCount { get; set; }
        /// <summary>
        /// 每页数量
        /// </summary>
        public int PageSize { get; set; }
        /// <summary>
        /// 当前页
        /// </summary>
        public int PageIndex { get; set; }
        /// <summary>
        /// 总页数
        /// </summary>
        public int PageCount { get; set; }
        /// <summary>
        /// 网址模板
        /// </summary>
        public string UrlTemplate { get; set; }
        /// <summary>
        /// 获取模板
        /// </summary>
        /// <param name="Template"></param>
        /// <param name="Page"></param>
        /// <returns></returns>
        public string GetTemplate(string Template, int Page)
        {
            var page = Page.ToString();
            return Template.Replace("{page}", page).Replace("{url}", GetUrl(page));
        }
        /// <summary>
        /// 返回网址
        /// </summary>
        /// <param name="Page">页码</param>
        /// <returns>返回网址</returns>
        public string GetUrl(int Page)
        {
            return GetUrl(Page.ToString());
        }
        /// <summary>
        /// 返回网址
        /// </summary>
        /// <param name="Page">页码</param>
        /// <returns>返回网址</returns>
        public string GetUrl(string Page)
        {
            return UrlTemplate.Replace("{page}", Page);
        }
        /// <summary>
        /// 获取连续页链接Html
        /// </summary>
        /// <param name="PrevNextCount">当前页前后数</param>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="CurrentTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByPageNums(int PrevNextCount, string LinkTemplate, string CurrentTemplate, string PrevMoreTemplate = "", string NextMoreTemplate = "")
        {
            var start = PageIndex - PrevNextCount;
            if (start < 1) { start = 1; }
            var end = PageIndex + PrevNextCount;
            if (end > PageCount) { end = PageCount; }
            var sb = new StringBuilder();
            if (!string.IsNullOrEmpty(PrevMoreTemplate) && start > 1)
            {
                sb.Append(GetTemplate(PrevMoreTemplate, start - 1));
            }
            for (int i = start, c = end + 1; i < c; i++)
            {
                if (i == PageIndex)
                {
                    sb.Append(GetTemplate(CurrentTemplate, i));
                }
                else
                {
                    sb.Append(GetTemplate(LinkTemplate, i));
                }
            }
            if (!string.IsNullOrEmpty(NextMoreTemplate) && end < PageCount)
            {
                sb.Append(GetTemplate(NextMoreTemplate, end + 1));
            }
            return sb.ToString();
        }
        /// <summary>
        /// 获取第1页链接Html
        /// </summary>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="CurrentTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByFirst(string LinkTemplate, string DisableTemplate = "")
        {
            string htm;
            if (PageIndex <= 1)
            {
                htm = GetTemplate(DisableTemplate, 1);
            }
            else
            {
                htm = GetTemplate(LinkTemplate, 1);
            }
            return htm;
        }
        /// <summary>
        /// 获取前面Step页链接Html
        /// </summary>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="DisableTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByPrevStep(int Step, string LinkTemplate, string DisableTemplate = "")
        {
            string htm;
            var num = PageIndex - Step;
            if (num < 1)
            {
                htm = GetTemplate(DisableTemplate, num);
            }
            else
            {
                htm = GetTemplate(LinkTemplate, num);
            }
            return htm;
        }
        /// <summary>
        /// 获取最后页链接Html
        /// </summary>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="DisableTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByLast(string LinkTemplate, string DisableTemplate = "")
        {
            string htm;
            if (PageIndex >= PageCount)
            {
                htm = GetTemplate(DisableTemplate, PageCount);
            }
            else
            {
                htm = GetTemplate(LinkTemplate, PageCount);
            }
            return htm;
        }
        /// <summary>
        /// 获取后面Step页链接Html
        /// </summary>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="CurrentTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByNextStep(int Step, string LinkTemplate, string DisableTemplate = "")
        {
            string htm;
            var num = PageIndex + Step;
            if (num > PageCount)
            {
                htm = GetTemplate(DisableTemplate, num);
            }
            else
            {
                htm = GetTemplate(LinkTemplate, num);
            }
            return htm;
        }
        /// <summary>
        /// 获取指定页链接Html
        /// </summary>
        /// <param name="LinkTemplate">链接模板（{url}网址）</param>
        /// <param name="CurrentTemplate">非链接模板（{url}网址）</param>
        /// <returns>返回Html</returns>
        public string GetTagsByPageNo(int Num, string LinkTemplate, string DisableTemplate = "")
        {
            string htm;
            if (Num < 1 && Num > PageCount)
            {
                htm = GetTemplate(DisableTemplate, Num);
            }
            else
            {
                htm = GetTemplate(LinkTemplate, Num);
            }
            return htm;
        }

        /// <summary>
        /// 当前页(过期，请使用PageIndex属性)
        /// </summary>
        public int GetPageIndex { get { return PageIndex; } }
        /// <summary>
        /// 设置网址模板(过期，请使用UrlTemplate属性)
        /// </summary>
        /// <param name="UrlTemplate"></param>
        /// <returns></returns>
        public Pager SetUrlTemplate(string UrlTemplate)
        {
            this.UrlTemplate = UrlTemplate;
            return this;
        }
    }

}