<?php

/**
 * 分页类
 * @auth
 * @date 2014-10-24
 */
class Pagination_lib {

	/**
	 * 参数设定
	 * @param int $current_page 當前頁數
	 * @param int $total_page 總頁數
	 * @param int $boundary 頁數臨界值
	 * @param int $front_range 前段顯示頁碼數
	 * @param int $mid_range 中段顯示頁碼數
	 * @param int $rear_range 後段顯示頁碼數
	 */
	public $current_page = 1;
	public $total_page = 10;
	public $boundary = 7;
	public $front_range = 1;
	public $mid_range = 5;
	public $rear_range = 1;
	//每个页的链接 如: domain/list#page=
	public $page_url = '?page=';
	public function __construct($base)
	    {
			$this->current_page	= $base['current_page'];
			$this->total_page	= $base['total_page'];
			$this->boundary		= $base['boundary'];
			$this->front_range	= $base['front_range'];
			$this->mid_range	= $base['mid_range'];
			$this->rear_range	= $base['rear_range'];
		}
	/**
	 * 初始化设置 分页类
	 * @param type $config
	 */
	function init($config = array()) {
		if (count($config) > 0) {
			foreach ($config as $key => $val) {
				if (isset($this -> $key)) {
					$this -> $key = $val;
				}
			}
		}
	}

	/**
	 * 分頁格式處理，ex. prev 1 ... 8 9 10 11 12 ... 20 next
	 *  copy from Store_lib.pagintion  , 从Store_lib中复制过来
	 * @param int $current_page 當前頁數
	 * @param int $total_page 總頁數
	 * @param int $boundary 頁數臨界值
	 * @param int $front_range 前段顯示頁碼數
	 * @param int $mid_range 中段顯示頁碼數
	 * @param int $rear_range 後段顯示頁碼數
	 * @return array 要顯示的頁碼
	 */
	public function pagintion_array($current_page = 1, $total_page = 10, $boundary = 7, $front_range = 1, $mid_range = 5, $rear_range = 1) {
		$pagintion = array();

		$current_page = ($current_page > $total_page) ? $total_page : $current_page;

		// 總頁數小於頁數臨界值，則顯示所有頁碼
		if ($total_page <= $boundary) {
			for ($i = 1; $i <= $total_page; $i++) {
				$pagintion[] = $i;
			}
		} else {
			$front_end = $front_range;
			// 前段最後一個頁碼
			$mid_start = $current_page - ceil(($mid_range - 1) / 2);
			// 中段第一個頁碼
			$mid_end = $current_page + (($mid_range - 1) - ceil(($mid_range - 1) / 2));
			// 中段最後一個頁碼
			$rear_start = $total_page - $rear_range + 1;
			// 後段第一個頁碼
			// 中段第一個頁碼小於等於1，中斷頁碼往左位移
			while ($mid_start <= 1) {
				if ($mid_start < 1)
					$mid_end += 1;
				$mid_start += 1;
			}

			// 中段第一個頁碼大於等於總頁數，中斷頁碼往右位移
			while ($mid_end >= $total_page) {
				if ($mid_end > $total_page)
					$mid_start -= 1;
				$mid_end -= 1;
			}

			// 取出需要顯示的頁碼數
			for ($i = 1; $i <= $total_page; $i++) {
				if ($i <= $front_end || ($i >= $mid_start && $i <= $mid_end) || $i >= $rear_start) {
					if ($i - (int) end($pagintion) > 1) {
						$pagintion[] = '...';
					}

					$pagintion[] = $i;
				}
			}
		}

		return $pagintion;
	}

	/**
	 * 拼装分页的 html  ;
	 * 样式 for jquery.simplepagination
	 * @return string
	 */
	function create_html() {
		$html = '<ul>';
		//计算总页数;
		//计算分页
		$pagintion = $this -> pagintion_array($this -> current_page, $this -> total_page, $this -> boundary, $this -> front_range, $this -> mid_range, $this -> rear_range);

		//上一页
		//上一页 不可点击
		if ($this -> current_page <= 1) {
			$html .= '<li class="active"><span class="current prev" style="color: #666; position: relative; width: 57px; background: rgb(255, 255, 255,0);"><span class="bg_prev" style="background-position: -78px -210px;"></span>上一页</span></li>';
		} else {
			//上一页可点击
			$page_prev = $this -> current_page - 1;
			$html .= '<li><a href="' . $this -> page_url . $page_prev . '" class="page-link prev" url="' . $this -> page_url . $page_prev . '" page="' . $page_prev . '" style="color: rgb(102, 102, 102); position: relative; background: rgb(255, 255, 255);"><span class="bg_prev" style="background-position: -99px -210px;"></span>上一页</a></li>';
		}

		//每一页的 链接
		foreach ($pagintion as $page_id) {
			if ($page_id == $this -> current_page) {
				$html .= '<li class="active"><span class="current">' . $page_id . '</span></li>';
			} elseif ($page_id == '...') {
				$html .= '<li class="disabled"><span class="ellipse">…</span></li>';
			} else {
				$html .= '<li><a href="' . $this -> page_url . $page_id . '" class="page-link" page="' . $page_id . '">' . $page_id . '</a></li>';
			}
		}

		//下一页
		//下一页 不可点击
		if ($this -> current_page >= $this -> total_page) {
			$html .= '<li class="active"><span class="current next" style="color: #666; position: relative; background: rgb(255, 255, 255,0);"><span class="bg_next" style="background-position: -84px -210px;"></span>下一页</span></li>';
		} else {
			//下一页 可点击
			$page_next = $this -> current_page + 1;
			$html .= '<li><a href="' . $this -> page_url . $page_next . '" class="page-link next" url="' . $this -> page_url . $page_next . '" page="' . $page_next . '" style="color: rgb(102, 102, 102); position: relative; width: auto; background: rgb(255, 255, 255,0);"><span class="bg_next" style="background-position: -104px -210px;"></span>下一页</a></li>';
		}
		$html .= '</ul>';
		return $html;
	}

}