<?php
$OJ_CACHE_SHARE = false;
$cache_time = 10;

require_once('./include/db_info.inc.php');
require_once('./include/const.inc.php');
require_once('./include/cache_start.php');
require_once('./include/curl.php');
require_once('./include/memcache.php');
require_once('./include/setlang.php');

$view_title = "Problem Set";

//remember page
$page = "1";
if (isset($_GET['page'])) {
	$page = intval($_GET['page']);
	if (isset($_SESSION[$OJ_NAME . '_' . 'user_id']) && !isset($_GET['search'])) {
		$sql = "update users set volume=? where user_id=?";
		pdo_query($sql, $page, $_SESSION[$OJ_NAME . '_' . 'user_id']);
	}
} else {
	if (isset($_SESSION[$OJ_NAME . '_' . 'user_id']) && !isset($_GET['search'])) {
		$sql = "select volume from users where user_id=?";
		$result = pdo_query($sql, $_SESSION[$OJ_NAME . '_' . 'user_id']);
		$row = $result[0];
		$page = intval($row[0]);
	} else {
		$page = 1;
	}

	if (!is_numeric($page) || $page <= 0)
		$page = '1';
}
//end of remember page

//Page Setting
$page_cnt = 50;  //50 problems per page

$postfix = "";
$filter_sql = "";
$limit_sql = "";
$order_by = " order by problem_id ";
$filter_params = array();
$hardness = 0;
if (isset($_GET['hardness'])) {
	$hardness = intval($_GET['hardness']);
	if ($hardness < 1 || $hardness > 8)
		$hardness = 0;
}
if (isset($_GET['search']) && trim($_GET['search']) != "") {
	$search = "%" . ($_GET['search']) . "%";
	$filter_sql = " ( title like ? or source like ?)";
	$filter_params[] = $search;
	$filter_params[] = $search;
	$limit_sql = " LIMIT " . ($page - 1) * $page_cnt . "," . $page_cnt;
	$postfix = "&search=" . urlencode($_GET['search']);
} else if (isset($_GET['list']) && trim($_GET['list'] != "")) {
	$plist = explode(",", $_GET['list']);
	$pids = "0";
	foreach ($plist as $pid) {
		$pid = intval($pid);
		$pids .= ",$pid";
	}
	$filter_sql = " problem_id in ($pids) ";
	$order_by = "order by FIELD(problem_id,$pids)"; // 如果希望按难度顺序改成 order by accepted desc ;
	//$limit_sql = " LIMIT ".($page-1)*$page_cnt.",".$page_cnt;
	$limit_sql = "";  // list 不翻页
} else {
	$filter_sql = " 1";
	$limit_sql = " LIMIT " . ($page - 1) * $page_cnt . "," . $page_cnt;
}
if ($hardness > 0) {
	$filter_sql .= " and hardness=?";
	$filter_params[] = $hardness;
	$postfix .= "&hardness=" . $hardness;
}

//all submit
//all acc
$sub_arr = array();
$acc_arr = array();
if (isset($_SESSION[$OJ_NAME . '_' . 'user_id'])) {
	$user_id = $_SESSION[$OJ_NAME . '_' . 'user_id'];
	// 管理员可以选择看谁的对错信息
	if (isset($_SESSION[$OJ_NAME . '_' . 'administrator']) && isset($_GET['query_user_id'])) {
		$user_id = $_GET['query_user_id'];
	}
	// 增加筛选题目的时候也要看学生的对错信息
	$sql = "SELECT problem_id, MIN(result) AS result FROM solution WHERE user_id=? and result>=4 GROUP BY problem_id ";
	$result = pdo_query($sql, $user_id);
	foreach ($result as $row) {
		$sub_arr[$row['problem_id']] = true;
		if ($row['result'] == 4)
			$acc_arr[$row['problem_id']] = true;
	}
}

// Problem Page Navigator
//if($OJ_SAE) $first=1;
if (isset($_SESSION[$OJ_NAME . '_' . 'administrator'])) {  //all problems
	//$limit = $limit_sql;
} else if ($OJ_FREE_PRACTICE) {  // open free practice without limit of contest using	
	$filter_sql .= " and defunct='N' ";
} else {  //page problems (not include in contests period)
	$now = date('Y-m-d H:i', time());
	$filter_sql .= " and `defunct`='N' AND `problem_id` NOT IN (
					SELECT  `problem_id`
						FROM contest c
						INNER JOIN  `contest_problem` cp ON c.`contest_id` = cp.`contest_id` " .
		" AND (c.`defunct` = 'N' AND '$now'<c.`end_time`)" .    // option style show all non-running contest
		//"and (c.`end_time` >  '$now'  OR c.private =1)" . // original style , hidden all private contest problems
		") ";
}
// End Page Setting
pdo_query("SET sort_buffer_size = 1024*1024");   // Out of sort memory, consider increasing server sort buffer size
$sql = "SELECT `problem_id`,`title`,`source`,`submit`,`accepted`,defunct FROM problem A WHERE $filter_sql $order_by $limit_sql ";
$count_sql = "SELECT count(1) from problem where  $filter_sql ";
//echo htmlentities( $sql);
if (count($filter_params) > 0) {
	$total = pdo_query($count_sql, ...$filter_params);
	$cnt = $total[0][0] / $page_cnt;
	$result = pdo_query($sql, ...$filter_params);
} else {
	$total = mysql_query_cache($count_sql);
	$cnt = $total[0][0] / $page_cnt;
	$result = mysql_query_cache($sql);
}
echo "";

$view_total_page = ceil($cnt * 1.0);

$cnt = 0;
$view_problemset = array();
$i = 0;
foreach ($result as $row) {
	$view_problemset[$i] = array();

	if (isset($sub_arr[$row['problem_id']])) {
		if (isset($acc_arr[$row['problem_id']]))
			$view_problemset[$i][0] = "<div class='label label-success'>Y</div>";
		else
			$view_problemset[$i][0] = "<div class='label label-danger'>N</div>";
	} else {
		$view_problemset[$i][0] = "<div class=none> </div>";
	}

	$category = array();
	$cate = explode(" ", $row['source']);
	foreach ($cate as $cat) {
		$cat = trim($cat);
		if (mb_ereg("^http", $cat)) {
			$cat = get_domain($cat);
		}
		array_push($category, trim($cat));
	}
	$view_problemset[$i][1] = "<div fd='problem_id' class='center'>" . $row['problem_id'] . "</div>";
	$view_problemset[$i][2] = "<div class='left'><a href='problem.php?id=" . $row['problem_id'] . "'>" . $row['title'] . "</a></div>";
	;
	$view_problemset[$i][3] = "<div pid='" . $row['problem_id'] . "' fd='source' class='center'>";

	foreach ($category as $cat) {
		if (trim($cat) == "" || trim($cat) == "&nbsp")
			continue;

		$hash_num = hexdec(substr(md5($cat), 0, 7));
		$label_theme = $color_theme[$hash_num % count($color_theme)];

		if ($label_theme == "")
			$label_theme = "default";

		$view_problemset[$i][3] .= "<a title='" . htmlentities($cat, ENT_QUOTES, 'UTF-8') . "' class='label label-$label_theme' style='display: inline-block;' href='problemset.php?search=" . htmlentities(urlencode($cat), ENT_QUOTES, 'UTF-8') . "'>" . mb_substr($cat, 0, 10, 'utf8') . "</a>&nbsp;";
	}

	$view_problemset[$i][3] .= "</div >";
	$view_problemset[$i][4] = "<div class='center'><a href='status.php?problem_id=" . $row['problem_id'] . "&jresult=4'>" . $row['accepted'] . "</a></div>";
	$view_problemset[$i][5] = "<div class='center'><a href='status.php?problem_id=" . $row['problem_id'] . "'>" . $row['submit'] . "</a></div>";
	$i++;
}
if (isset($_GET['ajax'])) {
	require("template/" . $OJ_TEMPLATE . "/problemset.php");
} else {
	require("template/" . $OJ_TEMPLATE . "/problemset.php");
}
if (file_exists('./include/cache_end.php'))
	require_once('./include/cache_end.php');
?>