rebuild-votes

#! /usr/bin/env php
<?php

require_once(__DIR__ . '/../lib/bootstrap.php');

$db = Gazelle\DB::DB();
$db->dropTemporaryTable("torrents_votes_new");
$db->prepared_query("
    CREATE TEMPORARY TABLE torrents_votes_new LIKE torrents_votes
");

echo Date('Y-m-d H-i-s') . " create new temp table\n";
$db->prepared_query("
    INSERT INTO torrents_votes_new (GroupID, Ups, Total)
    SELECT v.GroupID, sum(if(v.Type = 'Up', 1, 0)), count(*)
    FROM users_votes v
    GROUP BY v.GroupID
");

echo Date('Y-m-d H-i-s') . " update scores\n";
$db->prepared_query("
    UPDATE torrents_votes_new SET Score = ((Ups / Total) + 1.2817288 * 1.2817288 / (2 * Total) - 1.2817288
        * sqrt(((Ups / Total) * (1 - (Ups / Total)) + 1.2817288 * 1.2817288 / (4 * Total)) / Total))
            / (1 + 1.2817288 * 1.2817288 / Total)
");

$db->begin_transaction();
echo Date('Y-m-d H-i-s') . " delete old scores\n";
$db->prepared_query("
    DELETE FROM torrents_votes
");
echo Date('Y-m-d H-i-s') . " insert new scores\n";
$db->prepared_query("
    INSERT INTO torrents_votes
    SELECT * FROM torrents_votes_new
");
$db->commit();
self::$db->dropTemporaryTable("torrents_votes_new");

$max = $db->scalar("SELECT max(ID) FROM torrents_group");
$id = 0;

while ($id < $max) {
    $id++;
    echo Date('Y-m-d H-i-s') . " cache expiry $id/$max\n";
    $list = $db->scalar("
        SELECT group_concat(ID ORDER BY ID)
        FROM torrents_group
        WHERE ID >= ?
        ORDER BY ID
        LIMIT ?
        ", $id, 2000
    );
    if (!$list) {
        break;
    }
    $ids = explode(',', $list);
    $Cache->delete_multi($ids);
    $id = end($ids);
}