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

/**
 * Re-key open automated network tickets after #116.
 *
 * Network tickets used to hash on host alone, so every network alert for a
 * host shared one ticket. They now hash on host + the problem's heading (see
 * helpers/TicketHash.php). Without this script, each open network ticket
 * keeps its old hash and its next alert opens a duplicate instead of
 * updating it. Run once after deploying #116:
 *
 *   php scripts/rehash_network_tickets.php --dry-run   # report only
 *   php scripts/rehash_network_tickets.php
 *
 * Closed tickets keep their old hash on purpose: they stop catching
 * unrelated alerts. A ticket whose new hash already belongs to another ticket
 * is skipped and reported (resolve it by hand). Safe to re-run.
 */

if (php_sapi_name() !== 'cli') {
    http_response_code(403);
    exit('CLI access only');
}

require_once dirname(__DIR__) . '/config/config.php';
require_once dirname(__DIR__) . '/helpers/Database.php';
require_once dirname(__DIR__) . '/helpers/TicketHash.php';

$dryRun = in_array('--dry-run', $argv, true);
$conn = Database::getConnection();

$rows = $conn->query("SELECT ticket_id, title, hash FROM tickets WHERE status <> 'Closed' ORDER BY ticket_id")
    ->fetch_all(MYSQLI_ASSOC);

$counts = ['updated' => 0, 'unchanged' => 0, 'conflict' => 0];
$lookup = $conn->prepare("SELECT ticket_id FROM tickets WHERE hash = ? AND ticket_id <> ? LIMIT 1");
$update = $conn->prepare("UPDATE tickets SET hash = ? WHERE ticket_id = ?");

foreach ($rows as $row) {
    $data = ['title' => (string)$row['title']];
    $components = TicketHash::components($data);
    if ($components['issue_category'] !== 'network' || $components['source_type'] !== 'auto') {
        continue;
    }
    $newHash = TicketHash::generate($data);
    $id = $row['ticket_id'];

    if ($newHash === $row['hash']) {
        $counts['unchanged']++;
        echo "unchanged  $id  {$row['title']}\n";
        continue;
    }

    $lookup->bind_param('ss', $newHash, $id);
    $lookup->execute();
    $other = $lookup->get_result()->fetch_assoc();
    if ($other) {
        $counts['conflict']++;
        echo "CONFLICT   $id  {$row['title']}  (new hash already on ticket {$other['ticket_id']})\n";
        continue;
    }

    if (!$dryRun) {
        $update->bind_param('ss', $newHash, $id);
        $update->execute();
    }
    $counts['updated']++;
    echo ($dryRun ? 'would update' : 'updated   ') . " $id  {$row['title']}\n";
}

printf(
    "%s%d updated, %d already current, %d conflicts\n",
    $dryRun ? '[dry run] ' : '',
    $counts['updated'],
    $counts['unchanged'],
    $counts['conflict']
);