mirror of
https://github.com/renbaoshuo/S2OJ.git
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127 lines
2.8 KiB
PHP
127 lines
2.8 KiB
PHP
<?php
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class ClickZans {
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public static function getTable($type) {
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switch ($type) {
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case 'B':
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return 'blogs';
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case 'BC':
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return 'blogs_comments';
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case 'P':
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return 'problems';
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case 'C':
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return 'contests';
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}
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return null;
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}
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public static function canClickZan($id, $type, $user) {
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switch ($type) {
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case 'P':
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return UOJProblem::query($id)->userCanClickZan($user);
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default:
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return true;
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}
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}
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public static function query($id, $type, $user) {
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if ($user == null) {
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return 0;
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}
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$row = DB::selectFirst([
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"select val from click_zans",
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"where", [
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'username' => $user['username'],
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'type' => $type,
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'target_id' => $id
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]
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]);
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if ($row == null) {
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return 0;
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}
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return $row['val'];
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}
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public static function click($id, $type, $user, $delta) {
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if (!DB::$in_transaction) {
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return DB::transaction(fn () => ClickZans::click($id, $type, $user, $delta));
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}
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$table_name = ClickZans::getTable($type);
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$cur = ClickZans::query($id, $type, $user);
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$row = DB::selectFirst([
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"select zan from", DB::table($table_name),
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"where", ['id' => $id], DB::for_update()
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]);
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if (!$row) {
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return '<div class="text-danger">failed</div>';
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}
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if ($cur != $delta) {
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$cur += $delta;
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if ($cur == 0) {
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DB::delete([
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"delete from click_zans",
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"where", [
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'username' => Auth::id(),
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'type' => $type,
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'target_id' => $id
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]
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]);
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} elseif ($cur != $delta) {
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DB::update([
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"update click_zans",
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"set", ['val' => $cur],
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"where", [
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'username' => Auth::id(),
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'type' => $type,
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'target_id' => $id
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]
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]);
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} else {
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DB::insert([
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"insert into click_zans",
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"(username, type, target_id, val)", "values",
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DB::tuple([Auth::id(), $type, $id, $cur])
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]);
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}
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$cnt = $row['zan'] + $delta;
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DB::update([
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"update", DB::table($table_name),
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"set", ['zan' => $cnt],
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"where", ['id' => $id]
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]);
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} else {
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$cnt = $row['zan'];
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}
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return ClickZans::getBlock($type, $id, $cnt, $cur);
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}
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public static function getBlock($type, $id, $cnt, $val = null) {
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if ($val === null) {
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$val = ClickZans::query($id, $type, Auth::user());
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}
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return '<div class="uoj-click-zan-block" data-id="' . $id . '" data-type="' . $type . '" data-val="' . $val . '" data-cnt="' . $cnt . '"></div>';
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}
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public static function getCntBlock($cnt) {
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$cls = 'uoj-click-zan-block-';
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if ($cnt > 0) {
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$cls .= 'positive';
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} elseif ($cnt < 0) {
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$cls .= 'negative';
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} else {
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$cls .= 'neutral';
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}
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$display_cnt = $cnt > 0 ? '+' . $cnt : $cnt;
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if ($cnt < 0) $display_cnt = '-?';
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return '<span class="' . $cls . '"><span class="uoj-click-zan-cnt" title="' . $cnt . '">[<strong>' . $display_cnt . '</strong>]</span></span>';
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}
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}
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