<?php

declare(strict_types=1);

require __DIR__ . '/core/connection.php';

function findClosestRegionTimezone(PDO $pdo, float $lat, float $lon): ?string
{
    $stmt = $pdo->query(
        'SELECT timezone, lat, lon 
         FROM regions 
         WHERE timezone IS NOT NULL AND timezone <> ""'
    );

    $regions = $stmt->fetchAll(PDO::FETCH_ASSOC);
    if (!$regions) return null;

    $closest = null;
    $min = PHP_FLOAT_MAX;

    foreach ($regions as $r) {
        $dLat = $lat - (float)$r['lat'];
        $dLon = $lon - (float)$r['lon'];
        $dist = $dLat * $dLat + $dLon * $dLon;

        if ($dist < $min) {
            $min = $dist;
            $closest = $r['timezone'];
        }
    }

    return $closest;
}

$clientTz = isset($_GET['tz']) ? (string) $_GET['tz'] : null;

if ($clientTz && in_array($clientTz, timezone_identifiers_list(), true)) {

    date_default_timezone_set($clientTz);
} else {
    $fallback = 'UTC';

    if (isset($_GET['lat'], $_GET['lon'])) {
        $lat = (float) $_GET['lat'];
        $lon = (float) $_GET['lon'];

        $closestTz = findClosestRegionTimezone(db(), $lat, $lon);

        if ($closestTz && in_array($closestTz, timezone_identifiers_list(), true)) {
            $fallback = $closestTz;
        }
    }

    date_default_timezone_set($fallback);
}

function checkSite(string $region, string $url, int $rankGroup, string $timezone): array
{
    $start = microtime(true);

    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_NOBODY => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_TIMEOUT => 15,
        CURLOPT_CONNECTTIMEOUT => 5,
        CURLOPT_USERAGENT => "XoStatusChecker/1.0",
        CURLOPT_SSL_VERIFYPEER => true,
    ]);

    curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $error = curl_error($ch);
    $latency = (int) ((microtime(true) - $start) * 1000);
    curl_close($ch);

    $up = false;
    $note = null;

    if ($error) {
        $up = false;
        $note = 'cannot_fetch_web';
    } else {
        if ($code >= 200 && $code < 500) {
            $up = true;

            if ($code === 403) {
                $note = 'blocked_by_protection';
            } elseif ($code === 429) {
                $note = 'too_many_requests';
            }
        } elseif ($code >= 500 && $code <= 599) {
            $up = false;
            $note = 'cloudflare_origin_error';
        }
    }

    try {
        $dt = new DateTime('now', new DateTimeZone($timezone));
    } catch (Exception $e) {
        $dt = new DateTime('now', new DateTimeZone('UTC'));
    }

    return [
        'region'     => $region,
        'url'        => $url,
        'rank_group' => $rankGroup,
        'up'         => $up,
        'http'       => $code ?: null,
        'latency'    => $latency,
        'error'      => $note,
        'date'       => $dt->format('Y-m-d'),
        'time'       => $dt->format('H:i:s'),
    ];
}

function haversineDistance(float $lat1, float $lon1, float $lat2, float $lon2): float
{
    $earthRadius = 6371.0;

    $lat1Rad = deg2rad($lat1);
    $lon1Rad = deg2rad($lon1);
    $lat2Rad = deg2rad($lat2);
    $lat2Rad = deg2rad($lat2);
    $lon2Rad = deg2rad($lon2);

    $dLat = $lat2Rad - $lat1Rad;
    $dLon = $lon2Rad - $lon1Rad;

    $a = sin($dLat / 2) ** 2 +
        cos($lat1Rad) * cos($lat2Rad) * sin($dLon / 2) ** 2;

    $c = 2 * asin(min(1.0, sqrt($a)));

    return $earthRadius * $c;
}

$geoStatus = isset($_GET['geo']) ? (string) $_GET['geo'] : null;
$userLat = isset($_GET['lat']) ? (float) $_GET['lat'] : null;
$userLon = isset($_GET['lon']) ? (float) $_GET['lon'] : null;
$hasUserLocation = ($geoStatus === '1' && $userLat !== 0.0 && $userLon !== 0.0);

$maxRank = isset($_GET['max_rank']) ? (int) $_GET['max_rank'] : 1;
if ($maxRank < 1)
    $maxRank = 1;
if ($maxRank > 6)
    $maxRank = 6;

$allStmt = db()->prepare("
    SELECT id, region, url, rank_group, sort_order, rank_points, lat, lon, timezone
    FROM regions
    ORDER BY id ASC
");
$allStmt->execute();
$allRows = $allStmt->fetchAll();

foreach ($allRows as $i => $row) {
    $allRows[$i]['user_distance'] = null;
}

$closestThree = [];

if ($hasUserLocation && !empty($allRows)) {
    $distanceList = [];

    foreach ($allRows as $i => $row) {
        if ($row['lat'] === null || $row['lon'] === null) {
            continue;
        }

        $distKm = haversineDistance(
            $userLat,
            $userLon,
            (float) $row['lat'],
            (float) $row['lon']
        );

        $allRows[$i]['user_distance'] = $distKm;

        $distanceList[] = [
            'idx'  => $i,
            'dist' => $distKm,
        ];
    }

    if (!empty($distanceList)) {
        usort($distanceList, fn($a, $b) => $a['dist'] <=> $b['dist']);

        $top3 = array_slice($distanceList, 0, 3);

        $updateStmt = db()->prepare("
            UPDATE regions
            SET rank_points = rank_points + :points
            WHERE id = :id
        ");

        foreach ($top3 as $pos => $item) {
            $points = 0;
            if ($pos === 0) {
                $points = 1;
            } elseif ($pos === 1) {
                $points = 1;
            } elseif ($pos === 2) {
                $points = 1;
            }

            $idx = $item['idx'];

            $allRows[$idx]['rank_points'] = (int) $allRows[$idx]['rank_points'] + $points;

            $updateStmt->execute([
                ':points' => $points,
                ':id'     => $allRows[$idx]['id'],
            ]);

            $row   = $allRows[$idx];
            $tz    = (string) $row['timezone'];
            $check = checkSite($row['region'], $row['url'], (int) $row['rank_group'], $tz);

            $check['user_distance'] = $row['user_distance'];
            $check['rank_points']   = $row['rank_points'];
            $check['id']            = $row['id'];
            $check['timezone']      = $tz;

            $closestThree[] = $check;
        }
    }
}

$dynamicTiers = [];

if (!empty($allRows)) {
    $sortedByPoints = $allRows;

    usort($sortedByPoints, function (array $a, array $b): int {
        $cmp = (int) $b['rank_points'] <=> (int) $a['rank_points'];
        if ($cmp !== 0) {
            return $cmp;
        }
        $cmp = (int) $a['rank_group'] <=> (int) $b['rank_group'];
        if ($cmp !== 0) {
            return $cmp;
        }
        return (int) $a['sort_order'] <=> (int) $b['sort_order'];
    });

    foreach ($sortedByPoints as $index => $row) {
        $rankPosition = $index + 1;
        $tier = intdiv($rankPosition - 1, 10) + 1;
        if ($tier > 6) {
            $tier = 6;
        }
        $dynamicTiers[$row['id']] = $tier;
    }
}

foreach ($closestThree as &$r) {
    $id = $r['id'] ?? null;
    if ($id !== null && isset($dynamicTiers[$id])) {
        $r['tier'] = $dynamicTiers[$id];
    } else {
        $r['tier'] = 6;
    }
}
unset($r);

$rows = $allRows;

foreach ($rows as &$row) {
    $id = $row['id'];
    $row['tier'] = $dynamicTiers[$id] ?? 6;
}
unset($row);

usort($rows, function (array $a, array $b): int {
    $cmp = (int) $b['rank_points'] <=> (int) $a['rank_points'];
    if ($cmp !== 0) {
        return $cmp;
    }
    $cmp = (int) $a['rank_group'] <=> (int) $b['rank_group'];
    if ($cmp !== 0) {
        return $cmp;
    }
    return (int) $a['sort_order'] <=> (int) $b['sort_order'];
});

$allUp = true;
$totalChecked = 0;
$checks = [];

foreach ($rows as $row) {
    if ($row['tier'] > $maxRank) {
        continue;
    }

    $tz    = (string) $row['timezone'];
    $check = checkSite($row['region'], $row['url'], (int) $row['rank_group'], $tz);

    $check['user_distance'] = null;
    $check['rank_points']   = $row['rank_points'];
    $check['tier']          = $row['tier'];
    $check['timezone']      = $tz;

    $checks[] = $check;

    if (!$check['up']) {
        $allUp = false;
    }

    $totalChecked++;
}
?>
<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>Is DownDetector down?</title>
    <meta name="viewport" content="width=device-width,initial-scale=1">

    <link rel="stylesheet" href="./src/output.css">

    <base href="/Php-devs/isdowndetectordown/">

    <link rel="icon" type="image/png" href="assets/favicon/favicon-96x96.png" sizes="96x96">
    <link rel="icon" type="image/svg+xml" href="assets/favicon/favicon.svg">
    <link rel="shortcut icon" href="assets/favicon/favicon.ico">
    <link rel="apple-touch-icon" href="assets/favicon/apple-touch-icon.png">
    <link rel="manifest" href="assets/favicon/site.webmanifest">
    <meta name="apple-mobile-web-app-title" content="isdowndetectordown">

    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Lexend+Deca:wght@300;400;500;600;700&display=swap"
        rel="stylesheet">

    <style>
        body {
            font-family: 'Lexend Deca', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        }
    </style>

</head>

<body class="bg-gray-950 text-gray-200 p-6">
    <div class="max-w-6xl mx-auto">
        <div class="bg-gray-950 rounded-xl p-5 shadow-2xl border border-gray-800">
            <h1 class="text-3xl font-medium mb-2">Is DownDetector down?</h1>

            <p class="text-sm text-gray-400 mb-3 wrap-break-words leading-relaxed">
                What if DownDetector goes down? Bro, you're supposed to detect outages,
                not join them. Well, that’s why this detector exists
                <a href="#" class="text-blue-400 no-underline hover:underline"
                    onclick="location.reload(); return false;">
                    isdowndetectordown.rf.gd
                </a> :)
            </p>

            <?php if ($geoStatus === 'denied'): ?>
                <div class="text-xs text-yellow-300 mb-3">
                    Location access denied, using the default global rankings instead. To view the nearest regions, enable
                    location access in your browser settings.
                </div>
            <?php elseif ($geoStatus === 'unsupported'): ?>
                <div class="text-xs text-gray-500 mb-3">
                    Your browser does not support geolocation, using the default global rankings instead.
                </div>
            <?php endif; ?>

            <div
                class="<?= $allUp ? 'bg-emerald-950 border-green-600' : 'bg-red-950 border-red-600' ?> rounded-lg px-4 py-4 text-sm mb-5 flex items-center gap-2.5 border">
                <div>
                    <strong>
                        <?= $allUp
                            ? 'Tier ' . ($maxRank > 1 ? '1–' . (int) $maxRank : '1') . ' countries/regions are functioning properly.'
                            : 'Tier ' . ($maxRank > 1 ? '1–' . (int) $maxRank : '1') . ' countries/regions are malfunctioning.'
                            ?>
                    </strong><br>

                    <span class="text-xs">
                        Countries/Regions are organized by tier points and managed by the global userbase,
                        <?= (int) $totalChecked ?> webs were reviewed.
                    </span>

                </div>
            </div>

            <?php if ($hasUserLocation && !empty($closestThree)): ?>

                <div class="mb-5">
                    <div class="text-sm font-semibold mb-2 text-gray-200">
                        Nearest regions to you >
                    </div>
                    <div class="rounded-lg border border-gray-800 overflow-x-auto">
                        <table class="w-full border-collapse text-xs mt-2.5">
                            <thead class="bg-gray-950 border-b border-gray-800">
                                <tr>
                                    <th class="text-left px-1.5 py-2 w-[20%]">Country/Region</th>
                                    <th class="text-left px-1.5 py-2 w-[21%]">Domain</th>
                                    <th class="text-left px-1.5 py-2 w-[24%]">Status</th>
                                    <th class="text-left px-1.5 py-2 w-[8%]">HTTP</th>
                                    <th class="text-left px-1.5 py-2 w-[9%]">Latency</th>
                                    <th class="text-left px-1.5 py-2 w-[9%]">Date</th>
                                    <th class="text-left px-1.5 py-2 w-[9%]">Time</th>
                                </tr>
                            </thead>
                            <tbody>
                                <?php foreach ($closestThree as $r): ?>
                                    <tr class="bg-gray-950 border-t border-gray-900">
                                        <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap">
                                            <span
                                                class="inline-flex items-center justify-center min-w-[22px] px-1.5 py-0.5 rounded-full text-[11px] bg-gray-800 text-gray-400 mr-1">
                                                T<?= (int) $r['tier'] ?>
                                            </span>
                                            <?= htmlspecialchars($r['region'], ENT_QUOTES, 'UTF-8') ?>
                                        </td>
                                        <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap break-all">
                                            <a href="<?= htmlspecialchars($r['url'], ENT_QUOTES, 'UTF-8') ?>" target="_blank"
                                                class="text-blue-400 hover:underline">
                                                <?= htmlspecialchars(parse_url($r['url'], PHP_URL_HOST) ?? $r['url'], ENT_QUOTES, 'UTF-8') ?>
                                            </a>
                                        </td>
                                        <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap">
                                            <?php if ($r['up']): ?>
                                                <span
                                                    class="inline-flex items-center px-2 py-0.5 rounded-full text-[11px] font-medium bg-green-500/10 text-green-400">UP</span>
                                                <?php
                                                if ($r['error'] === 'blocked_by_protection') {
                                                    echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">blocked by protection</span>';
                                                } elseif ($r['error'] === 'too_many_requests') {
                                                    echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">too many requests</span>';
                                                } elseif ($r['error'] === null) {
                                                    echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">no protection found</span>';
                                                }
                                                ?>
                                            <?php else: ?>
                                                <span
                                                    class="inline-flex items-center px-2 py-0.5 rounded-full text-[11px] font-medium bg-red-500/10 text-red-300">DOWN</span>
                                                <?php if ($r['error'] === 'cloudflare_origin_error'): ?>
                                                    <span
                                                        class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-red-500/20 text-red-200 ml-1.5">cloudflare
                                                        origin error</span>
                                                <?php elseif ($r['error'] === 'cannot_fetch_web'): ?>
                                                    <span
                                                        class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-red-500/20 text-red-200 ml-1.5">cann't
                                                        fetch web</span>
                                                <?php endif; ?>
                                            <?php endif; ?>
                                        </td>
                                        <td class="px-1.5 py-2 whitespace-nowrap font-mono">
                                            <?= $r['http'] !== null ? (int) $r['http'] : '-' ?>
                                        </td>
                                        <td class="px-1.5 py-2 whitespace-nowrap">
                                            <?= $r['latency'] ?: '-' ?>
                                        </td>
                                        <td class="px-1.5 py-2 whitespace-nowrap">
                                            <?= htmlspecialchars($r['date']) ?>
                                        </td>
                                        <td class="px-1.5 py-2 whitespace-nowrap">
                                            <?= htmlspecialchars($r['time']) ?>
                                        </td>
                                    </tr>
                                <?php endforeach; ?>
                            </tbody>
                        </table>
                    </div>
                </div>
            <?php endif; ?>

            <div class="text-sm font-semibold mb-2 text-gray-200">
                Globally top regions >
            </div>
            <div class="rounded-lg border border-gray-800 mb-4 overflow-x-auto">
                <table class="w-full border-collapse text-xs mt-2.5">
                    <thead class="bg-gray-950 border-b border-gray-800">
                        <tr>
                            <th class="text-left px-1.5 py-2 w-[20%]">Country/Region</th>
                            <th class="text-left px-1.5 py-2 w-[21%]">Domain</th>
                            <th class="text-left px-1.5 py-2 w-[24%]">Status</th>
                            <th class="text-left px-1.5 py-2 w-[8%]">HTTP</th>
                            <th class="text-left px-1.5 py-2 w-[9%]">Latency</th>
                            <th class="text-left px-1.5 py-2 w-[9%]">Date</th>
                            <th class="text-left px-1.5 py-2 w-[9%]">Time</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($checks as $r): ?>
                            <tr class="bg-gray-950 border-t border-gray-900">
                                <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap">
                                    <span
                                        class="inline-flex items-center justify-center min-w-[22px] px-1.5 py-0.5 rounded-full text-[11px] bg-gray-800 text-gray-400 mr-1">
                                        T<?= (int) $r['tier'] ?>
                                    </span>
                                    <?= htmlspecialchars($r['region'], ENT_QUOTES, 'UTF-8') ?>
                                </td>
                                <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap break-all">
                                    <a href="<?= htmlspecialchars($r['url'], ENT_QUOTES, 'UTF-8') ?>" target="_blank"
                                        class="text-blue-400 hover:underline">
                                        <?= htmlspecialchars(parse_url($r['url'], PHP_URL_HOST) ?? $r['url'], ENT_QUOTES, 'UTF-8') ?>
                                    </a>
                                </td>
                                <td class="px-1.5 py-2 overflow-hidden text-ellipsis whitespace-nowrap">
                                    <?php if ($r['up']): ?>
                                        <span
                                            class="inline-flex items-center px-2 py-0.5 rounded-full text-[11px] font-medium bg-green-500/10 text-green-400">UP</span>
                                        <?php
                                        if ($r['error'] === 'blocked_by_protection') {
                                            echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">blocked by protection</span>';
                                        } elseif ($r['error'] === 'too_many_requests') {
                                            echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">too many requests</span>';
                                        } elseif ($r['error'] === null) {
                                            echo '<span class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-blue-500/10 text-blue-300 ml-1.5">no protection found</span>';
                                        }
                                        ?>
                                    <?php else: ?>
                                        <span
                                            class="inline-flex items-center px-2 py-0.5 rounded-full text-[11px] font-medium bg-red-500/10 text-red-300">DOWN</span>
                                        <?php if ($r['error'] === 'cloudflare_origin_error'): ?>
                                            <span
                                                class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-red-500/20 text-red-200 ml-1.5">cloudflare
                                                origin error</span>
                                        <?php elseif ($r['error'] === 'cannot_fetch_web'): ?>
                                            <span
                                                class="inline-flex items-center px-2 py-0.5 rounded-full text-[10px] bg-red-500/20 text-red-200 ml-1.5">cann't
                                                fetch web</span>
                                        <?php endif; ?>
                                    <?php endif; ?>
                                </td>
                                <td class="px-1.5 py-2 whitespace-nowrap font-mono">
                                    <?= $r['http'] !== null ? (int) $r['http'] : '-' ?>
                                </td>
                                <td class="px-1.5 py-2 whitespace-nowrap">
                                    <?= $r['latency'] ?: '-' ?>
                                </td>
                                <td class="px-1.5 py-2 whitespace-nowrap">
                                    <?= htmlspecialchars($r['date']) ?>
                                </td>
                                <td class="px-1.5 py-2 whitespace-nowrap">
                                    <?= htmlspecialchars($r['time']) ?>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>

            <?php if ($maxRank < 6): ?>
                <div class="mt-3 text-center">
                    <a href="?max_rank=<?= (int) ($maxRank + 1) ?>" class="inline-flex items-center justify-center
                   px-3 py-1.5 text-[13.5px]      /* mobile size */
                   sm:px-3.5 sm:py-2 sm:text-sm   /* desktop size */
                   rounded-full border border-gray-700 bg-gray-900 text-gray-200
                   hover:bg-gray-800 transition-colors">
                        View more ( Tier <?= (int) ($maxRank + 1) ?> )
                    </a>
                </div>
            <?php endif; ?>

            <div
                class="mt-4 rounded-xl border border-gray-800 bg-[#0c0f17] p-5 text-[11px] text-gray-400 leading-relaxed">
                <h2 class="text-sm font-semibold text-gray-200 mb-3">Technical Information</h2>

                <p class="mb-2">
                    <span class="sm underline">Response Codes</span>
                    > 200–299 OK. 300–399 redirects.
                    403 = protected, 429 = too many requests.
                    500–599 = Cloudflare's origin error.
                </p>

                <p class="mb-2">
                    <span class="sm underline">Protection</span>
                    > Uses standard HEAD checks only; no bypassing of Cloudflare, WAF, or rate-limits.
                    Some protected sites may return 403, but this means they are still fully operational.
                </p>

                <p>
                    <span class="sm underline">Latency</span>
                    > Includes DNS, SSL/TLS handshake, and server response.
                    Distance + routing can affect timing.
                </p>
            </div>
            <div
                class="mt-4 rounded-xl border border-gray-800 bg-[#0c0f17] p-5 text-[11px] text-gray-400 leading-relaxed text-center">

                <p class="text-gray-400 mb-1">
                    This website is owned by
                    <a href="https://www.xodivorce.in" target="_blank"
                        class="text-blue-400 no-underline hover:underline">
                        xodivorce,
                    </a>
                    <br>
                    and managed by
                    <a href="https://neosubhamoy.com" target="_blank"
                        class="text-blue-400 no-underline hover:underline">
                        neosubhamoy.
                    </a>
                </p>

                <div class="flex items-center justify-center gap-4 mb-2 text-[11px]">
                    <a href="https://github.com/xodivorce/isdowndetectordown" target="_blank"
                        class="text-blue-400 no-underline hover:underline">
                        GitHub
                    </a>

                    <span class="text-gray-600">|</span>

                    <a href="https://gitea.neosubhamoy.com/xodivorce/isdowndetectordown" target="_blank"
                        class="text-green-400 no-underline hover:underline">
                        Gitea
                    </a>
                </div>

                <p class="text-gray-300 font-medium">
                    <span id="copyright-text"></span>
                </p>
            </div>
        </div>
</body>

<script>
    window.APP_CONFIG = {
        startYear: <?= json_encode($_ENV['START_YEAR'] ?? 2025) ?>
    };
</script>
<script src="./assets/js/dashboard.js"></script>

</html>