<?php
declare(strict_types=1);

ini_set('display_errors', '1');
error_reporting(E_ALL);
session_start();

$loggedIn = isset($_SESSION['user_id']);
$pageTitle = 'Kometen - AstroTools';
$headerIntroPre = 'Himmel & Planeten';
$headerIntroTitle = 'Kometen';
$headerIntroSub = 'Interessante Kometen aus der MPC-Datenbank mit Fokus auf bevorstehende und aktuelle Periheldurchgaenge.';

function h(?string $value): string
{
    return htmlspecialchars((string) $value, ENT_QUOTES, 'UTF-8');
}

function runPythonApi(string $action, array $args): array
{
    $scriptPath = __DIR__ . '/py/api.py';
    $pythonCandidates = PHP_OS_FAMILY === 'Windows'
        ? ['python', 'py']
        : ['/usr/bin/python3', '/usr/bin/python', 'python3', 'python'];

    $escapedArguments = array_map('escapeshellarg', array_merge([$scriptPath, $action], $args));
    $lastError = 'Python konnte nicht gestartet werden.';

    foreach ($pythonCandidates as $pythonBinary) {
        $command = $pythonBinary . ' ' . implode(' ', $escapedArguments) . ' 2>&1';
        $output = [];
        $resultCode = 0;
        exec($command, $output, $resultCode);

        $joined = trim(implode("\n", $output));
        $decoded = json_decode($joined, true);

        if (is_array($decoded)) {
            return [
                'ok' => (bool) ($decoded['ok'] ?? false),
                'data' => $decoded,
                'raw' => $joined,
                'command' => $command,
            ];
        }

        if ($joined !== '') {
            $lastError = $joined;
        } elseif ($resultCode !== 0) {
            $lastError = 'Fehlercode ' . $resultCode . ' bei ' . $pythonBinary;
        }
    }

    return [
        'ok' => false,
        'error' => $lastError,
    ];
}

function runPythonApiWithJsonPayloadFile(string $action, array $payload): array
{
    $tempFile = tempnam(sys_get_temp_dir(), 'skyview_py_');
    if ($tempFile === false) {
        return [
            'ok' => false,
            'error' => 'Temporäre Datei für Python-Payload konnte nicht erstellt werden.',
        ];
    }

    $jsonPayload = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    if ($jsonPayload === false) {
        @unlink($tempFile);
        return [
            'ok' => false,
            'error' => 'Python-Payload konnte nicht als JSON kodiert werden.',
        ];
    }

    if (file_put_contents($tempFile, $jsonPayload) === false) {
        @unlink($tempFile);
        return [
            'ok' => false,
            'error' => 'Temporäre Datei für Python-Payload konnte nicht geschrieben werden.',
        ];
    }

    try {
        return runPythonApi($action, ['@' . $tempFile]);
    } finally {
        @unlink($tempFile);
    }
}

function formatDecimalGerman(?float $value, int $decimals = 3): string
{
    if ($value === null || !is_finite($value)) {
        return '-';
    }

    return number_format($value, $decimals, ',', '.');
}

function formatRaHours(?float $hours): string
{
    if ($hours === null || !is_finite($hours)) {
        return '-';
    }

    $normalized = fmod($hours, 24.0);
    if ($normalized < 0.0) {
        $normalized += 24.0;
    }

    $totalSeconds = (int) round($normalized * 3600.0);
    $raHours = intdiv($totalSeconds, 3600) % 24;
    $raMinutes = intdiv($totalSeconds % 3600, 60);
    $raSeconds = $totalSeconds % 60;

    return sprintf('%02dh %02dm %02ds', $raHours, $raMinutes, $raSeconds);
}

function formatDeclination(?float $degrees): string
{
    if ($degrees === null || !is_finite($degrees)) {
        return '-';
    }

    $sign = $degrees < 0.0 ? '-' : '+';
    $absolute = abs($degrees);
    $deg = (int) floor($absolute);
    $minutesFloat = ($absolute - $deg) * 60.0;
    $minutes = (int) floor($minutesFloat);
    $seconds = (int) round(($minutesFloat - $minutes) * 60.0);

    if ($seconds >= 60) {
        $seconds -= 60;
        $minutes += 1;
    }

    if ($minutes >= 60) {
        $minutes -= 60;
        $deg += 1;
    }

    return sprintf('%s%02d° %02d\' %02d"', $sign, $deg, $minutes, $seconds);
}

function buildPerihelionDate(array $row): ?DateTimeImmutable
{
    $year = isset($row['year_of_perihelion']) ? (int) $row['year_of_perihelion'] : 0;
    $month = isset($row['month_of_perihelion']) ? (int) $row['month_of_perihelion'] : 0;
    $dayValue = isset($row['day_of_perihelion']) ? (float) $row['day_of_perihelion'] : 0.0;

    if ($year === 0 || $month < 1 || $month > 12 || $dayValue <= 0) {
        return null;
    }

    $day = (int) floor($dayValue);
    if ($day < 1 || $day > 31) {
        return null;
    }

    $fractionalDay = $dayValue - $day;
    $seconds = (int) round($fractionalDay * 86400);

    try {
        $date = new DateTimeImmutable(sprintf('%04d-%02d-%02d 00:00:00', $year, $month, $day), new DateTimeZone('UTC'));
    } catch (Throwable $e) {
        return null;
    }

    return $date->modify(sprintf('+%d seconds', $seconds));
}

function classifyOrbitType(string $orbitType): string
{
    return match (strtoupper(trim($orbitType))) {
        'P' => 'Periodisch',
        'C' => 'Nicht periodisch',
        'I' => 'Interstellar',
        'D' => 'Verschollen / zerfallen',
        'A' => 'Asteroidal',
        default => trim($orbitType) !== '' ? trim($orbitType) : '-',
    };
}

$config = require __DIR__ . '/../config/database.php';
$dsn = sprintf(
    'mysql:host=%s;dbname=%s;charset=%s',
    $config['host'],
    $config['dbname'],
    $config['charset'] ?? 'utf8mb4'
);

$pdo = new PDO(
    $dsn,
    $config['user'],
    $config['pass'],
    [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    ]
);

$userId = isset($_SESSION['user_id']) ? (int) $_SESSION['user_id'] : 0;
$today = new DateTimeImmutable('today', new DateTimeZone('UTC'));
$windowStart = $today->modify('-180 days');
$windowEnd = $today->modify('+365 days');
$queryYearMin = (int) $windowStart->format('Y') - 1;
$queryYearMax = (int) $windowEnd->format('Y') + 1;

$stmtComets = $pdo->prepare("
    SELECT
        c.*,
        CASE WHEN auc.`comet_id` IS NULL THEN 0 ELSE 1 END AS `is_tracked`,
        CASE WHEN auc.`is_favorite` = 1 THEN 1 ELSE 0 END AS `is_favorite`
    FROM `comets_mpc` c
    LEFT JOIN `app_user_comets` auc
        ON auc.`comet_id` = c.`id`
       AND auc.`user_id` = :user_id
    WHERE c.`year_of_perihelion` BETWEEN :year_min AND :year_max
       OR auc.`comet_id` IS NOT NULL
    ORDER BY c.`year_of_perihelion` ASC, c.`month_of_perihelion` ASC, c.`day_of_perihelion` ASC, c.`designation_and_name` ASC
");
$stmtComets->execute([
    ':user_id' => $userId,
    ':year_min' => $queryYearMin,
    ':year_max' => $queryYearMax,
]);
$cometRows = $stmtComets->fetchAll();

$allComets = [];
$trackedComets = [];
$interestingComets = [];

foreach ($cometRows as $row) {
    $perihelionDate = buildPerihelionDate($row);
    $daysFromToday = $perihelionDate ? (int) floor(($perihelionDate->getTimestamp() - $today->getTimestamp()) / 86400) : null;

    $row['perihelion_date_object'] = $perihelionDate;
    $row['perihelion_date_display'] = $perihelionDate ? $perihelionDate->format('d.m.Y H:i') . ' UTC' : '-';
    $row['days_from_today'] = $daysFromToday;
    $row['orbit_type_label'] = classifyOrbitType((string) ($row['orbit_type'] ?? ''));
    $row['absolute_magnitude_display'] = isset($row['absolute_magnitude_h']) && $row['absolute_magnitude_h'] !== null
        ? formatDecimalGerman((float) $row['absolute_magnitude_h'], 1)
        : '-';
    $row['photometric_index_display'] = isset($row['slope_parameter_g']) && $row['slope_parameter_g'] !== null
        ? formatDecimalGerman((float) $row['slope_parameter_g'], 1)
        : '-';
    $row['estimated_magnitude'] = null;
    $row['estimated_magnitude_display'] = '-';
    $row['brightness_error'] = null;

    $allComets[] = $row;

    if ((int) ($row['is_tracked'] ?? 0) === 1) {
        $trackedComets[] = $row;
    }

    if ($perihelionDate !== null && $perihelionDate >= $windowStart && $perihelionDate <= $windowEnd) {
        $interestingComets[] = $row;
    }
}

usort($trackedComets, static function (array $left, array $right): int {
    $favoriteCompare = ((int) $right['is_favorite']) <=> ((int) $left['is_favorite']);
    if ($favoriteCompare !== 0) {
        return $favoriteCompare;
    }

    return ((int) ($left['days_from_today'] ?? PHP_INT_MAX)) <=> ((int) ($right['days_from_today'] ?? PHP_INT_MAX));
});

usort($interestingComets, static function (array $left, array $right): int {
    $leftDistance = abs((int) ($left['days_from_today'] ?? PHP_INT_MAX));
    $rightDistance = abs((int) ($right['days_from_today'] ?? PHP_INT_MAX));
    if ($leftDistance !== $rightDistance) {
        return $leftDistance <=> $rightDistance;
    }

    return strcmp((string) $left['designation_and_name'], (string) $right['designation_and_name']);
});

$interestingComets = array_slice($interestingComets, 0, 24);
$visibleCometIds = [];
foreach (array_merge($trackedComets, $interestingComets) as $visibleComet) {
    $visibleId = isset($visibleComet['id']) ? (int) $visibleComet['id'] : 0;
    if ($visibleId > 0) {
        $visibleCometIds[$visibleId] = true;
    }
}

$calculationMoment = new DateTimeImmutable('now', new DateTimeZone('UTC'));
$brightnessByCometId = [];
$brightnessError = null;

if ($visibleCometIds !== []) {
    $pythonPayload = [
        'date' => $calculationMoment->format('Y-m-d\TH:i:s\Z'),
        'comets' => array_values(array_map(static function (array $row): array {
            return [
                'id' => $row['id'] ?? null,
                'year_of_perihelion' => $row['year_of_perihelion'] ?? null,
                'month_of_perihelion' => $row['month_of_perihelion'] ?? null,
                'day_of_perihelion' => $row['day_of_perihelion'] ?? null,
                'perihelion_dist_au' => $row['perihelion_dist_au'] ?? null,
                'eccentricity' => $row['eccentricity'] ?? null,
                'arg_perihelion_deg' => $row['arg_perihelion_deg'] ?? null,
                'ascending_node_deg' => $row['ascending_node_deg'] ?? null,
                'inclination_deg' => $row['inclination_deg'] ?? null,
                'absolute_magnitude_h' => $row['absolute_magnitude_h'] ?? null,
                'slope_parameter_g' => $row['slope_parameter_g'] ?? null,
            ];
        }, array_filter($cometRows, static function (array $row) use ($visibleCometIds): bool {
            $rowId = isset($row['id']) ? (int) $row['id'] : 0;
            return $rowId > 0 && isset($visibleCometIds[$rowId]);
        }))),
    ];

    $pythonResult = runPythonApiWithJsonPayloadFile('comet_brightnesses', $pythonPayload);

    if (($pythonResult['ok'] ?? false) && isset($pythonResult['data']['results']) && is_array($pythonResult['data']['results'])) {
        foreach ($pythonResult['data']['results'] as $result) {
            $resultId = isset($result['id']) ? (int) $result['id'] : 0;
            if ($resultId > 0) {
                $brightnessByCometId[$resultId] = $result;
            }
        }
    } else {
        $brightnessError = (string) ($pythonResult['error'] ?? 'Python-Berechnung nicht verfuegbar.');
    }
}

$applyBrightness = static function (array $row) use ($brightnessByCometId): array {
    $brightnessData = isset($row['id']) ? ($brightnessByCometId[(int) $row['id']] ?? null) : null;
    $estimatedMagnitude = isset($brightnessData['estimated_magnitude']) && is_numeric($brightnessData['estimated_magnitude'])
        ? (float) $brightnessData['estimated_magnitude']
        : null;
    $raHours = isset($brightnessData['ra_hours']) && is_numeric($brightnessData['ra_hours'])
        ? (float) $brightnessData['ra_hours']
        : null;
    $decDeg = isset($brightnessData['dec_deg']) && is_numeric($brightnessData['dec_deg'])
        ? (float) $brightnessData['dec_deg']
        : null;
    $heliocentricDistance = isset($brightnessData['heliocentric_distance_au']) && is_numeric($brightnessData['heliocentric_distance_au'])
        ? (float) $brightnessData['heliocentric_distance_au']
        : null;
    $geocentricDistance = isset($brightnessData['geocentric_distance_au']) && is_numeric($brightnessData['geocentric_distance_au'])
        ? (float) $brightnessData['geocentric_distance_au']
        : null;

    $row['estimated_magnitude'] = $estimatedMagnitude;
    $row['estimated_magnitude_display'] = $estimatedMagnitude !== null
        ? formatDecimalGerman($estimatedMagnitude, 1)
        : '-';
    $row['ra_hours'] = $raHours;
    $row['ra_display'] = formatRaHours($raHours);
    $row['dec_deg'] = $decDeg;
    $row['dec_display'] = formatDeclination($decDeg);
    $row['heliocentric_distance_au'] = $heliocentricDistance;
    $row['heliocentric_distance_display'] = formatDecimalGerman($heliocentricDistance, 3);
    $row['geocentric_distance_au'] = $geocentricDistance;
    $row['geocentric_distance_display'] = formatDecimalGerman($geocentricDistance, 3);
    $row['brightness_error'] = is_array($brightnessData) && !empty($brightnessData['error'])
        ? (string) $brightnessData['error']
        : null;

    return $row;
};

$trackedComets = array_map($applyBrightness, $trackedComets);
$interestingComets = array_map($applyBrightness, $interestingComets);
$orbitTypeCounts = [];
foreach ($allComets as $comet) {
    $orbitKey = (string) ($comet['orbit_type'] ?? '?');
    $orbitTypeCounts[$orbitKey] = ($orbitTypeCounts[$orbitKey] ?? 0) + 1;
}
arsort($orbitTypeCounts);
?>
<?php require __DIR__ . '/header.php'; ?>

<style>
.comets-layout {
    display: grid;
    gap: 1.25rem;
}

.comets-intro {
    color: #d9e7ff;
    line-height: 1.65;
    margin: 0;
}

.comets-summary {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.9rem;
}

.comets-stat {
    padding: 1rem 1.1rem;
    border-radius: 1rem;
    border: 1px solid rgba(130, 170, 255, 0.16);
    background:
        radial-gradient(circle at top left, rgba(82, 153, 255, 0.12), transparent 36%),
        linear-gradient(180deg, rgba(13, 19, 33, 0.96), rgba(8, 11, 20, 0.98));
}

.comets-stat-label {
    color: #9db2d4;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.comets-stat-value {
    margin-top: 0.45rem;
    color: #ffffff;
    font-size: 1.8rem;
    font-weight: 700;
}

.comets-stat-help {
    margin-top: 0.35rem;
    color: #c7d6f4;
    font-size: 0.92rem;
}

.comets-card {
    padding: 1.2rem;
}

.comets-card h2 {
    margin-bottom: 0.45rem;
}

.comets-card .hint {
    margin-top: 0;
}

.comets-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1rem;
}

.comets-chip {
    padding: 0.45rem 0.7rem;
    border-radius: 999px;
    border: 1px solid rgba(130, 170, 255, 0.18);
    background: rgba(255, 255, 255, 0.04);
    color: #dce8ff;
    font-size: 0.92rem;
}

.comets-table-wrap {
    overflow-x: auto;
}

.comets-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.comets-table th,
.comets-table td {
    padding: 0.78rem 0.8rem;
    border-bottom: 1px solid rgba(130, 170, 255, 0.12);
    text-align: left;
    vertical-align: top;
}

.comets-table th {
    color: #a9bee0;
    font-size: 0.84rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.comets-table th[data-sortable] {
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

.comets-table th[data-sortable]::after {
    content: ' ⇅';
    opacity: 0.35;
    font-size: 0.78em;
}

.comets-table th[data-sortable][data-sort-dir="asc"]::after {
    content: ' ↑';
    opacity: 1;
    color: #c9a84c;
}

.comets-table th[data-sortable][data-sort-dir="desc"]::after {
    content: ' ↓';
    opacity: 1;
    color: #c9a84c;
}

.comets-table td {
    color: #eef4ff;
}

.comets-name {
    font-weight: 600;
}

.comets-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.35rem;
}

.comets-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.22rem 0.5rem;
    border-radius: 999px;
    font-size: 0.8rem;
    color: #eef4ff;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.comets-badge.is-favorite {
    background: rgba(255, 208, 102, 0.12);
    border-color: rgba(255, 208, 102, 0.28);
    color: #ffd98b;
}

.comets-badge.is-tracked {
    background: rgba(130, 170, 255, 0.12);
    border-color: rgba(130, 170, 255, 0.26);
    color: #bfd6ff;
}

.comets-days {
    font-weight: 600;
}

.comets-days.is-past {
    color: #ffb2a8;
}

.comets-days.is-upcoming {
    color: #b8f0c8;
}

@media (max-width: 960px) {
    .comets-summary {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .comets-summary {
        grid-template-columns: 1fr;
    }
}
</style>

<div class="comets-layout">
    <section class="card comets-card">
        <p class="comets-intro">
            Diese erste Version liest die vorhandenen Kometen direkt aus <code>comets_mpc</code> und hebt Objekte hervor,
            deren Perihel zwischen <strong><?= h($windowStart->format('d.m.Y')) ?></strong> und
            <strong><?= h($windowEnd->format('d.m.Y')) ?></strong> liegt.
            Nutzer-Favoriten aus <code>app_user_comets</code> werden zusaetzlich separat gezeigt.
        </p>
        <p class="hint">
            Die Spalte <strong>m grob</strong> nutzt jetzt die uebliche MPC-Kometenformel fuer <strong>heute</strong>:
            <code>H + 5 log(Delta) + 2,5 * n * log(r)</code>. Sie bleibt trotzdem nur eine Orientierung.
        </p>
        <p class="hint">
            Position und Helligkeit werden fuer <strong><?= h($calculationMoment->format('d.m.Y H:i')) ?> UTC</strong> berechnet.
        </p>
        <?php if ($brightnessError !== null): ?>
            <p class="hint">Die Python-Berechnung der Helligkeit war nicht verfuegbar: <?= h($brightnessError) ?></p>
        <?php endif; ?>

        <div class="comets-chip-row">
            <?php foreach (array_slice($orbitTypeCounts, 0, 5, true) as $orbitType => $count): ?>
                <span class="comets-chip"><?= h(classifyOrbitType((string) $orbitType)) ?>: <?= (int) $count ?></span>
            <?php endforeach; ?>
        </div>
    </section>

    <section class="comets-summary">
        <div class="comets-stat">
            <div class="comets-stat-label">Kometen im Blickfenster</div>
            <div class="comets-stat-value"><?= count($interestingComets) ?></div>
            <div class="comets-stat-help">Perihel im aktuellen Zeitfenster</div>
        </div>
        <div class="comets-stat">
            <div class="comets-stat-label">Meine Kometen</div>
            <div class="comets-stat-value"><?= count($trackedComets) ?></div>
            <div class="comets-stat-help">Aus den Favoriten uebernommen</div>
        </div>
        <div class="comets-stat">
            <div class="comets-stat-label">Gesamt in Datenbank</div>
            <div class="comets-stat-value"><?= count($allComets) ?></div>
            <div class="comets-stat-help">Geladene Datensaetze im relevanten Jahresbereich</div>
        </div>
        <div class="comets-stat">
            <div class="comets-stat-label">Zeitraum</div>
            <div class="comets-stat-value"><?= h($today->format('Y')) ?></div>
            <div class="comets-stat-help"><?= h($windowStart->format('d.m.Y')) ?> bis <?= h($windowEnd->format('d.m.Y')) ?></div>
        </div>
    </section>

    <section class="card comets-card">
        <h2>Meine Kometen</h2>
        <?php if (empty($trackedComets)): ?>
            <p class="hint">Du hast aktuell noch keine Kometen in deinen Favoriten. In <a href="my_favorites.php">Favoriten</a> kannst du welche markieren.</p>
        <?php else: ?>
            <div class="comets-table-wrap">
                <table class="comets-table">
                    <thead>
                        <tr>
                            <th data-sortable>Komet</th>
                            <th data-sortable>Typ</th>
                            <th data-sortable>RA</th>
                            <th data-sortable>Dec</th>
                            <th data-sortable>Perihel</th>
                            <th data-sortable>Abstand</th>
                            <th data-sortable title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($trackedComets as $comet): ?>
                            <?php
                            $daysClass = ((int) ($comet['days_from_today'] ?? 0)) < 0 ? 'is-past' : 'is-upcoming';
                            $daysLabel = $comet['days_from_today'] === null
                                ? '-'
                                : ((int) $comet['days_from_today'] === 0
                                    ? 'Heute'
                                    : (((int) $comet['days_from_today'] > 0 ? '+' : '') . (int) $comet['days_from_today'] . ' Tage'));
                            $perihelionTs = $comet['perihelion_date_object'] instanceof DateTimeImmutable ? $comet['perihelion_date_object']->getTimestamp() : '';
                            ?>
                            <tr>
                                <td>
                                    <div class="comets-name"><?= h((string) $comet['designation_and_name']) ?></div>
                                    <div class="comets-meta">
                                        <?php if ((int) $comet['is_favorite'] === 1): ?>
                                            <span class="comets-badge is-favorite">Favorit</span>
                                        <?php endif; ?>
                                        <span class="comets-badge is-tracked">Beobachtet</span>
                                        <?php if (!empty($comet['reference_text'])): ?>
                                            <span class="comets-badge"><?= h((string) $comet['reference_text']) ?></span>
                                        <?php endif; ?>
                                    </div>
                                </td>
                                <td><?= h((string) $comet['orbit_type_label']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['ra_hours'] ?? '')) ?>"><?= h((string) $comet['ra_display']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['dec_deg'] ?? '')) ?>"><?= h((string) $comet['dec_display']) ?></td>
                                <td data-sort-value="<?= h((string) $perihelionTs) ?>"><?= h((string) $comet['perihelion_date_display']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['days_from_today'] ?? '')) ?>"><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
                                <td data-sort-value="<?= h((string) ($comet['estimated_magnitude'] ?? '')) ?>" title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
                            </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
        <?php endif; ?>
    </section>

    <section class="card comets-card">
        <h2>Interessante Kometen</h2>
        <p class="hint">Sortiert nach Naehe zum heutigen Datum bezogen auf den Periheldurchgang.</p>
        <?php if (empty($interestingComets)): ?>
            <p class="hint">Im aktuellen Zeitfenster wurden keine Kometen gefunden.</p>
        <?php else: ?>
            <div class="comets-table-wrap">
                <table class="comets-table">
                    <thead>
                        <tr>
                            <th data-sortable>Komet</th>
                            <th data-sortable>Typ</th>
                            <th data-sortable>RA</th>
                            <th data-sortable>Dec</th>
                            <th data-sortable>Perihel</th>
                            <th data-sortable>Abstand</th>
                            <th data-sortable title="Grobe Helligkeitsschaetzung fuer heute nach H + 5 log(Delta) + 2,5 * n * log(r).">m grob</th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ($interestingComets as $comet): ?>
                            <?php
                            $daysClass = ((int) ($comet['days_from_today'] ?? 0)) < 0 ? 'is-past' : 'is-upcoming';
                            $daysLabel = $comet['days_from_today'] === null
                                ? '-'
                                : ((int) $comet['days_from_today'] === 0
                                    ? 'Heute'
                                    : (((int) $comet['days_from_today'] > 0 ? '+' : '') . (int) $comet['days_from_today'] . ' Tage'));
                            $perihelionTs = $comet['perihelion_date_object'] instanceof DateTimeImmutable ? $comet['perihelion_date_object']->getTimestamp() : '';
                            ?>
                            <tr>
                                <td>
                                    <div class="comets-name"><?= h((string) $comet['designation_and_name']) ?></div>
                                    <div class="comets-meta">
                                        <?php if ((int) $comet['is_favorite'] === 1): ?>
                                            <span class="comets-badge is-favorite">Favorit</span>
                                        <?php elseif ((int) $comet['is_tracked'] === 1): ?>
                                            <span class="comets-badge is-tracked">Beobachtet</span>
                                        <?php endif; ?>
                                        <?php if (!empty($comet['reference_text'])): ?>
                                            <span class="comets-badge"><?= h((string) $comet['reference_text']) ?></span>
                                        <?php endif; ?>
                                    </div>
                                </td>
                                <td><?= h((string) $comet['orbit_type_label']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['ra_hours'] ?? '')) ?>"><?= h((string) $comet['ra_display']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['dec_deg'] ?? '')) ?>"><?= h((string) $comet['dec_display']) ?></td>
                                <td data-sort-value="<?= h((string) $perihelionTs) ?>"><?= h((string) $comet['perihelion_date_display']) ?></td>
                                <td data-sort-value="<?= h((string) ($comet['days_from_today'] ?? '')) ?>"><span class="comets-days <?= $daysClass ?>"><?= h($daysLabel) ?></span></td>
                                <td data-sort-value="<?= h((string) ($comet['estimated_magnitude'] ?? '')) ?>" title="r = <?= h((string) $comet['heliocentric_distance_display']) ?> AE, Δ = <?= h((string) $comet['geocentric_distance_display']) ?> AE"><?= h((string) $comet['estimated_magnitude_display']) ?></td>
                            </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>
        <?php endif; ?>
    </section>
</div>

<script>
(function () {
    function getCellValue(row, colIndex) {
        const cell = row.cells[colIndex];
        if (!cell) return '';
        const sv = cell.getAttribute('data-sort-value');
        if (sv !== null && sv !== '') return sv;
        return cell.textContent.trim();
    }

    function compareValues(a, b) {
        const numA = parseFloat(a);
        const numB = parseFloat(b);
        if (!isNaN(numA) && !isNaN(numB)) return numA - numB;
        return a.localeCompare(b, 'de', { sensitivity: 'base' });
    }

    document.querySelectorAll('.comets-table').forEach(function (table) {
        const headers = table.querySelectorAll('th[data-sortable]');
        headers.forEach(function (th, colIndex) {
            th.addEventListener('click', function () {
                const currentDir = th.getAttribute('data-sort-dir');
                const ascending = currentDir !== 'asc';

                headers.forEach(function (h) { h.removeAttribute('data-sort-dir'); });
                th.setAttribute('data-sort-dir', ascending ? 'asc' : 'desc');

                const tbody = table.querySelector('tbody');
                const rows = Array.from(tbody.querySelectorAll('tr'));
                rows.sort(function (a, b) {
                    const av = getCellValue(a, colIndex);
                    const bv = getCellValue(b, colIndex);
                    const cmp = compareValues(av, bv);
                    return ascending ? cmp : -cmp;
                });
                rows.forEach(function (row) { tbody.appendChild(row); });
            });
        });
    });
}());
</script>

<?php require __DIR__ . '/footer.php'; ?>