<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Common\Util\Think;

class Page
{
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage = 11; // 分页栏每页显示的页数

    private $p       = 'p'; //分页参数名
    private $url     = ''; //当前链接URL
    private $nowPage = 1;

    // 分页显示定制
    private $config = array(
        'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
        'prev'   => '上一页',
        'next'   => '下一页',
        'first'  => '1...',
        'last'   => '...%TOTAL_PAGE%',
        'theme'  => '%FIRST%%UP_PAGE%%LINK_PAGE%%DOWN_PAGE%%END%',
    );

    /**
     * 架构函数
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows, $listRows = 20, $parameter = array())
    {
        C('VAR_PAGE') && $this->p = C('VAR_PAGE'); //设置分页参数名称
        /* 基础设置 */
        $this->totalRows = $totalRows; //设置总记录数
        $this->listRows  = $listRows; //设置每页显示行数
        $this->parameter = empty($parameter) ? $_GET : $parameter;
        $this->nowPage   = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
        $this->nowPage   = $this->nowPage > 0 ? $this->nowPage : 1;
        $this->firstRow  = $this->listRows * ($this->nowPage - 1);
        if (is_wap()) {
            $this->rollPage  = 3;
            $this->config['theme']  = '%UP_PAGE%%LINK_PAGE%%DOWN_PAGE%';
        }
    }

    /**
     * 定制分页链接设置
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setConfig($name, $value)
    {
        if (isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }

    /**
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     */
    private function url($page)
    {
        return str_replace(urlencode('[PAGE]'), $page, $this->url);
    }

    /**
     * 组装分页链接
     * @return string
     */
    public function show()
    {
        if (0 == $this->totalRows) {
            return '';
        }

        /* 生成URL */
        $this->parameter[$this->p] = '[PAGE]';
        $this->url                 = U(ACTION_NAME, $this->parameter);
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
        if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }

        /* 计算分页临时变量 */
        $now_cool_page      = $this->rollPage / 2;
        $now_cool_page_ceil = ceil($now_cool_page);

        //上一页
        $up_row  = $this->nowPage - 1;
        $up_page = $up_row > 0 ? '<li><a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a></li>' : '';

        //下一页
        $down_row  = $this->nowPage + 1;
        $down_page = ($down_row <= $this->totalPages) ? '<li><a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a></li>' : '';

        //第一页
        $the_first = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
            $the_first = '<li><a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a></li>';
        }

        //最后一页
        $the_end = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
            $the_end = '<li><a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a></li>';
        }

        //数字连接
        $link_page = "";
        for ($i = 1; $i <= $this->rollPage; $i++) {
            if (($this->nowPage - $now_cool_page) <= 0) {
                $page = $i;
            } elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
                $page = $this->totalPages - $this->rollPage + $i;
            } else {
                $page = $this->nowPage - $now_cool_page_ceil + $i;
            }
            if ($page > 0 && $page != $this->nowPage) {

                if ($page <= $this->totalPages) {
                    $link_page .= '<li><a class="num" href="' . $this->url($page) . '">' . $page . '</a></li>';
                } else {
                    break;
                }
            } else {
                if ($page > 0 && 1 != $this->totalPages) {
                    $link_page .= '<li class="active current"><span class="num">' . $page . '</span></li>';
                }
            }
        }

        if ($link_page) {
            if (!$up_page) {
                $up_page = '<li><a class="prev" href="#">没有了</a></li>';
            }
            if (!$down_page) {
                $down_page = '<li><a class="next" href="#">没有了</a></li>';
            }
        }

        //替换分页内容
        $page_str = str_replace(
            array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'),
            array($this->config['header'], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages),
            $this->config['theme']);
        return "{$page_str}";
    }
}
