<?php
declare(strict_types=1);

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

require_once __DIR__ . '/auth_helpers.php';
applyLocalDevLoginBypass();

$pageTitle = 'Ephemeriden - AstroTools';
$headerIntroPre = 'Berechnungen';
$headerIntroTitle = 'Ephemeriden';
$headerIntroSub = '';

$loggedIn = isset($_SESSION['user_id']);
$defaultLocation = null;
$favoriteMinorplanetOptions = [];
$favoriteCometOptions = [];
$minorplanetPayloads = [];
$cometPayloads = [];
$chartStarData = [];
$chartLineStarData = [];
$chartConstellationLines = [];
$ephemerisChartConfigJson = 'null';
$ephemerisStarDataJson = '[]';
$ephemerisLineStarDataJson = '[]';
$ephemerisConstellationLinesJson = '[]';

function decodeMpcPackedDateChar(string $value): ?int
{
    if ($value >= '0' && $value <= '9') {
        return (int) $value;
    }

    $upper = strtoupper($value);
    if ($upper >= 'A' && $upper <= 'V') {
        return ord($upper) - ord('A') + 10;
    }

    return null;
}

function decodeMpcPackedDate(?string $packed): ?string
{
    if ($packed === null || strlen($packed) !== 5) {
        return null;
    }

    $centuryMap = [
        'I' => 1800,
        'J' => 1900,
        'K' => 2000,
    ];

    $centuryCode = strtoupper($packed[0]);
    if (!isset($centuryMap[$centuryCode])) {
        return null;
    }

    $yearPart = substr($packed, 1, 2);
    if (!ctype_digit($yearPart)) {
        return null;
    }

    $month = decodeMpcPackedDateChar($packed[3]);
    $day = decodeMpcPackedDateChar($packed[4]);
    if ($month === null || $day === null || $month < 1 || $month > 12 || $day < 1 || $day > 31) {
        return null;
    }

    return sprintf('%04d-%02d-%02d', $centuryMap[$centuryCode] + (int) $yearPart, $month, $day);
}

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

    if ($year <= 0 || $month < 1 || $month > 12 || $dayValue <= 0.0) {
        return null;
    }

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

    $fractionalDay = $dayValue - $day;
    $seconds = (int) round($fractionalDay * 86400.0);

    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))->format('c');
}

if ($loggedIn && isset($_SESSION['user_id'])) {
    try {
        $cfg = require __DIR__ . '/../config/database.php';
        $pdo = new PDO(
            sprintf('mysql:host=%s;dbname=%s;charset=%s', $cfg['host'], $cfg['dbname'], $cfg['charset'] ?? 'utf8mb4'),
            $cfg['user'],
            $cfg['pass'],
            [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            ]
        );

        $stmtLoc = $pdo->prepare(
            'SELECT id, name, latitude, longitude, elevation, timezone
             FROM app_user_locations
             WHERE user_id = ? AND is_default = 1
             LIMIT 1'
        );
        $stmtLoc->execute([(int) $_SESSION['user_id']]);
        $defaultLocation = $stmtLoc->fetch() ?: null;

        $stmtFavoriteMinorplanets = $pdo->prepare(
            'SELECT
                mp.id,
                mp.mp_number,
                mp.designation_text,
                mp.desig_packed,
                mp.epoch_packed,
                mp.mean_anomaly_deg,
                mp.arg_perihelion_deg,
                mp.ascending_node_deg,
                mp.inclination_deg,
                mp.eccentricity,
                mp.mean_motion_deg_per_day,
                mp.semimajor_axis_au
             FROM app_user_minorplanets aum
             INNER JOIN minorplanets_mpc mp
                 ON mp.id = aum.minorplanet_id
             WHERE aum.user_id = ?
             ORDER BY aum.is_favorite DESC, mp.mp_number IS NULL ASC, mp.mp_number ASC, mp.designation_text ASC'
        );
        $stmtFavoriteMinorplanets->execute([(int) $_SESSION['user_id']]);
        foreach ($stmtFavoriteMinorplanets->fetchAll() as $minorplanet) {
            $minorplanetLabel = trim((string) ($minorplanet['designation_text'] ?? ''));
            if ($minorplanetLabel === '') {
                $minorplanetLabel = trim((string) ($minorplanet['desig_packed'] ?? ''));
            }
            if ($minorplanetLabel === '') {
                continue;
            }

            if (
                $minorplanet['mp_number'] !== null
                && !str_contains($minorplanetLabel, '(' . (string) $minorplanet['mp_number'] . ')')
            ) {
                $minorplanetLabel = '(' . (string) $minorplanet['mp_number'] . ') ' . $minorplanetLabel;
            }

            $bodyKey = 'minorplanet:' . (string) $minorplanet['id'];
            $favoriteMinorplanetOptions[$bodyKey] = $minorplanetLabel;
            $minorplanetPayloads[$bodyKey] = [
                'id' => (int) $minorplanet['id'],
                'designation' => $minorplanetLabel,
                'epochDateIso' => decodeMpcPackedDate((string) ($minorplanet['epoch_packed'] ?? '')),
                'meanAnomalyDeg' => isset($minorplanet['mean_anomaly_deg']) ? (float) $minorplanet['mean_anomaly_deg'] : null,
                'argPerihelionDeg' => isset($minorplanet['arg_perihelion_deg']) ? (float) $minorplanet['arg_perihelion_deg'] : null,
                'ascendingNodeDeg' => isset($minorplanet['ascending_node_deg']) ? (float) $minorplanet['ascending_node_deg'] : null,
                'inclinationDeg' => isset($minorplanet['inclination_deg']) ? (float) $minorplanet['inclination_deg'] : null,
                'eccentricity' => isset($minorplanet['eccentricity']) ? (float) $minorplanet['eccentricity'] : null,
                'meanMotionDegPerDay' => isset($minorplanet['mean_motion_deg_per_day']) ? (float) $minorplanet['mean_motion_deg_per_day'] : null,
                'semimajorAxisAu' => isset($minorplanet['semimajor_axis_au']) ? (float) $minorplanet['semimajor_axis_au'] : null,
            ];
        }

        $stmtFavoriteComets = $pdo->prepare(
            'SELECT
                c.id,
                c.designation_and_name,
                c.year_of_perihelion,
                c.month_of_perihelion,
                c.day_of_perihelion,
                c.perihelion_dist_au,
                c.eccentricity,
                c.arg_perihelion_deg,
                c.ascending_node_deg,
                c.inclination_deg
             FROM app_user_comets auc
             INNER JOIN comets_mpc c
                 ON c.id = auc.comet_id
             WHERE auc.user_id = ?
             ORDER BY auc.is_favorite DESC, c.designation_and_name ASC'
        );
        $stmtFavoriteComets->execute([(int) $_SESSION['user_id']]);
        foreach ($stmtFavoriteComets->fetchAll() as $comet) {
            $cometLabel = trim((string) ($comet['designation_and_name'] ?? ''));
            if ($cometLabel === '') {
                continue;
            }

            $bodyKey = 'comet:' . (string) $comet['id'];
            $favoriteCometOptions[$bodyKey] = $cometLabel;
            $cometPayloads[$bodyKey] = [
                'id' => (int) $comet['id'],
                'designation' => $cometLabel,
                'perihelionIso' => buildCometPerihelionIso($comet),
                'perihelionDistanceAu' => isset($comet['perihelion_dist_au']) ? (float) $comet['perihelion_dist_au'] : null,
                'eccentricity' => isset($comet['eccentricity']) ? (float) $comet['eccentricity'] : null,
                'argPerihelionDeg' => isset($comet['arg_perihelion_deg']) ? (float) $comet['arg_perihelion_deg'] : null,
                'ascendingNodeDeg' => isset($comet['ascending_node_deg']) ? (float) $comet['ascending_node_deg'] : null,
                'inclinationDeg' => isset($comet['inclination_deg']) ? (float) $comet['inclination_deg'] : null,
            ];
        }

        $stmtStars = $pdo->query(
            "SELECT hip, proper, bayer, con, spect, mag, ci, rarad, decrad
             FROM star_hipparcos
             WHERE mag IS NOT NULL
               AND rarad IS NOT NULL
               AND decrad IS NOT NULL
               AND mag <= 6.0
             ORDER BY mag ASC"
        );

        while ($row = $stmtStars->fetch()) {
            $chartStarData[] = [
                'hip' => $row['hip'] !== null ? (int) $row['hip'] : null,
                'proper' => trim((string) ($row['proper'] ?? '')),
                'bayer' => trim((string) ($row['bayer'] ?? '')),
                'con' => trim((string) ($row['con'] ?? '')),
                'spect' => trim((string) ($row['spect'] ?? '')),
                'ra' => (float) $row['rarad'],
                'dec' => (float) $row['decrad'],
                'mag' => (float) $row['mag'],
                'ci' => $row['ci'] !== null ? (float) $row['ci'] : null,
            ];
        }

        $constellationIndex = [];
        $ensureConstellation = static function (string $id) use (&$constellationIndex): void {
            if (!isset($constellationIndex[$id])) {
                $constellationIndex[$id] = [
                    'id' => $id,
                    'lines' => [],
                ];
            }
        };

        $lineStmt = $pdo->query(
            "SELECT cl.constellation_id, cl.line_index, clp.point_index, clp.hip_number
             FROM constellation_lines cl
             INNER JOIN constellation_line_points clp ON clp.line_id = cl.id
             ORDER BY cl.constellation_id, cl.line_index, clp.point_index"
        );

        foreach ($lineStmt as $row) {
            $constellationId = (string) $row['constellation_id'];
            $lineIndex = (int) $row['line_index'];
            $ensureConstellation($constellationId);
            $constellationIndex[$constellationId]['lines'][$lineIndex] ??= [];
            $constellationIndex[$constellationId]['lines'][$lineIndex][] = (int) $row['hip_number'];
        }

        foreach ($constellationIndex as &$constellation) {
            if ($constellation['lines']) {
                ksort($constellation['lines']);
                $constellation['lines'] = array_values($constellation['lines']);
            }
        }
        unset($constellation);

        $chartConstellationLines = array_values($constellationIndex);

        $lineStarStmt = $pdo->query(
            "SELECT DISTINCT sh.hip, sh.proper, sh.bayer, sh.con, sh.spect, sh.mag, sh.ci, sh.rarad, sh.decrad
             FROM constellation_line_points clp
             INNER JOIN star_hipparcos sh ON sh.hip = clp.hip_number
             WHERE sh.rarad IS NOT NULL
               AND sh.decrad IS NOT NULL"
        );

        while ($row = $lineStarStmt->fetch()) {
            $chartLineStarData[] = [
                'hip' => $row['hip'] !== null ? (int) $row['hip'] : null,
                'proper' => trim((string) ($row['proper'] ?? '')),
                'bayer' => trim((string) ($row['bayer'] ?? '')),
                'con' => trim((string) ($row['con'] ?? '')),
                'spect' => trim((string) ($row['spect'] ?? '')),
                'ra' => (float) $row['rarad'],
                'dec' => (float) $row['decrad'],
                'mag' => $row['mag'] !== null ? (float) $row['mag'] : 99.0,
                'ci' => $row['ci'] !== null ? (float) $row['ci'] : null,
            ];
        }
    } catch (Throwable $e) {
        $defaultLocation = null;
        $favoriteMinorplanetOptions = [];
        $favoriteCometOptions = [];
        $minorplanetPayloads = [];
        $cometPayloads = [];
        $chartStarData = [];
        $chartLineStarData = [];
        $chartConstellationLines = [];
    }
}

$planetOptions = [
    'Sun' => 'Sonne',
    'Moon' => 'Mond',
    'Mercury' => 'Merkur',
    'Venus' => 'Venus',
    'Mars' => 'Mars',
    'Jupiter' => 'Jupiter',
    'Saturn' => 'Saturn',
    'Uranus' => 'Uranus',
    'Neptune' => 'Neptun',
];

$bodyOptions = $planetOptions + $favoriteMinorplanetOptions + $favoriteCometOptions;

$intervalOptions = [
    '1' => '1 Minute',
    '10' => '10 Minuten',
    '30' => '30 Minuten',
    '60' => '1 Stunde',
    '360' => '6 Stunden',
    '720' => '12 Stunden',
    '1440' => '1 Tag',
    '2880' => '2 Tage',
    '4320' => '3 Tage',
    '10080' => '7 Tage',
    '20160' => '14 Tage',
    '43200' => '30 Tage',
];

$selectedBody = (string) ($_POST['body'] ?? 'Mercury');
if (!isset($bodyOptions[$selectedBody])) {
    $selectedBody = 'Mercury';
}

$selectedInterval = (string) ($_POST['interval_minutes'] ?? '1440');
if (!isset($intervalOptions[$selectedInterval])) {
    $selectedInterval = '1440';
}

$startDtInput = trim((string) ($_POST['start_dt'] ?? ''));
if ($startDtInput !== '' && !preg_match('/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}$/', $startDtInput)) {
    $startDtInput = '';
}

$endDtInput = trim((string) ($_POST['end_dt'] ?? ''));
if ($endDtInput !== '' && !preg_match('/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}$/', $endDtInput)) {
    $endDtInput = '';
}

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

function ephemeriden_slug(string $value): string
{
    $value = strtolower(trim($value));
    $value = str_replace(
        ['ä', 'ö', 'ü', 'ß', ' '],
        ['ae', 'oe', 'ue', 'ss', '-'],
        $value
    );
    $value = preg_replace('/[^a-z0-9\-]+/', '-', $value) ?? $value;
    $value = trim($value, '-');
    return $value !== '' ? $value : 'ephemeriden';
}

function runEphemeridenPythonApi(string $action, array $args): array
{
    $scriptPath = __DIR__ . '/py/ephemeriden_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,
    ];
}

$pageLocation = null;
if (is_array($defaultLocation) && $defaultLocation !== []) {
    $pageLocation = [
        'name' => trim((string) ($defaultLocation['name'] ?? '')),
        'latitude' => isset($defaultLocation['latitude']) ? (float) $defaultLocation['latitude'] : null,
        'longitude' => isset($defaultLocation['longitude']) ? (float) $defaultLocation['longitude'] : null,
        'elevation' => isset($defaultLocation['elevation']) && $defaultLocation['elevation'] !== null ? (float) $defaultLocation['elevation'] : 0.0,
        'timezone' => (string) ($defaultLocation['timezone'] ?? 'Europe/Berlin'),
    ];
}

$defaultLocationName = $pageLocation['name'] ?? '';
$errorMessage = '';
$ephemerisRows = [];
$ephemerisChartRowsJson = '[]';
$ephemerisWindowStartIso = null;
$exportFormat = (string) ($_POST['export_format'] ?? '');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ($pageLocation === null || $pageLocation['latitude'] === null || $pageLocation['longitude'] === null) {
        $errorMessage = 'Kein gültiger Standard-Standort verfügbar. Bitte zuerst in den Einstellungen einen Standard-Standort setzen.';
    } elseif ($endDtInput === '') {
        $errorMessage = 'Bitte ein Enddatum angeben.';
    } else {
        $tz = new DateTimeZone($pageLocation['timezone']);
        $startDt = $startDtInput !== ''
            ? DateTimeImmutable::createFromFormat('Y-m-d\TH:i', $startDtInput, $tz)
            : new DateTimeImmutable('now', $tz);
        $endDt = DateTimeImmutable::createFromFormat('Y-m-d\TH:i', $endDtInput, $tz);

        if ($startDt === false || $endDt === false) {
            $errorMessage = 'Start- oder Enddatum ist ungültig.';
        } elseif ($endDt <= $startDt) {
            $errorMessage = 'Das Enddatum muss nach dem Startdatum liegen.';
        } else {
            $rangeMinutes = (string) (int) round(($endDt->getTimestamp() - $startDt->getTimestamp()) / 60);
            $pythonAction = 'planet_ephemeris';
            $pythonArgs = [
                (string) $pageLocation['latitude'],
                (string) $pageLocation['longitude'],
                (string) $pageLocation['elevation'],
                (string) $pageLocation['timezone'],
                $selectedBody,
                $selectedInterval,
                $rangeMinutes,
                'minutes',
                $startDtInput,
            ];

            if (isset($minorplanetPayloads[$selectedBody])) {
                $pythonAction = 'small_body_ephemeris';
                $pythonArgs = [
                    (string) $pageLocation['latitude'],
                    (string) $pageLocation['longitude'],
                    (string) $pageLocation['elevation'],
                    (string) $pageLocation['timezone'],
                    'minorplanet',
                    base64_encode(json_encode($minorplanetPayloads[$selectedBody], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '{}'),
                    $selectedInterval,
                    $rangeMinutes,
                    'minutes',
                    $startDtInput,
                ];
            } elseif (isset($cometPayloads[$selectedBody])) {
                $pythonAction = 'small_body_ephemeris';
                $pythonArgs = [
                    (string) $pageLocation['latitude'],
                    (string) $pageLocation['longitude'],
                    (string) $pageLocation['elevation'],
                    (string) $pageLocation['timezone'],
                    'comet',
                    base64_encode(json_encode($cometPayloads[$selectedBody], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '{}'),
                    $selectedInterval,
                    $rangeMinutes,
                    'minutes',
                    $startDtInput,
                ];
            }

        $pythonResult = runEphemeridenPythonApi($pythonAction, $pythonArgs);

        if (!$pythonResult['ok']) {
            $errorMessage = (string) (
                $pythonResult['data']['error']
                ?? $pythonResult['error']
                ?? 'Die Ephemeriden konnten nicht berechnet werden.'
            );
        } else {
            $ephemerisRows = $pythonResult['data']['rows'] ?? [];
            $ephemerisWindowStartIso = isset($pythonResult['data']['window']['local_start'])
                ? (string) $pythonResult['data']['window']['local_start']
                : null;
            if (!is_array($ephemerisRows)) {
                $ephemerisRows = [];
            }

            if ($exportFormat === 'csv' && $ephemerisRows !== []) {
                $filename = 'ephemeriden-' . ephemeriden_slug((string) ($bodyOptions[$selectedBody] ?? 'objekt')) . '.csv';

                header('Content-Type: text/csv; charset=utf-8');
                header('Content-Disposition: attachment; filename="' . $filename . '"');
                header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');

                echo "\xEF\xBB\xBF";
                $handle = fopen('php://output', 'wb');
                if ($handle === false) {
                    exit;
                }

                fputcsv($handle, ['Name des Objekts', 'Datum', 'Uhrzeit', 'RA (J2000)', 'RA (J2000, dezimal h)', 'Dek (J2000)', 'Dek (J2000, dezimal °)', 'Aufgang', 'Untergang'], ';', '"', '\\');
                foreach ($ephemerisRows as $row) {
                    fputcsv($handle, [
                        (string) ($row['object_name'] ?? ''),
                        (string) ($row['date_local'] ?? ''),
                        (string) ($row['time_local'] ?? ''),
                        (string) ($row['ra'] ?? ''),
                        (string) ($row['ra_decimal_hours'] ?? ''),
                        (string) ($row['dec'] ?? ''),
                        (string) ($row['dec_decimal_deg'] ?? ''),
                        (string) (($row['rise'] ?? null) ?? '—'),
                        (string) (($row['set'] ?? null) ?? '—'),
                    ], ';', '"', '\\');
                }

                fclose($handle);
                exit;
            }
        }
        }
    }
}

if ($ephemerisRows !== []) {
    $chartRows = [];
    foreach ($ephemerisRows as $row) {
        $azimuthDeg = isset($row['azimuth_deg']) ? (float) $row['azimuth_deg'] : null;
        $altitudeDeg = isset($row['altitude_deg']) ? (float) $row['altitude_deg'] : null;
        if ($azimuthDeg === null || $altitudeDeg === null) {
            continue;
        }

        $chartRows[] = [
            'object_name' => (string) ($row['object_name'] ?? ''),
            'date_local' => (string) ($row['date_local'] ?? ''),
            'time_local' => (string) ($row['time_local'] ?? ''),
            'local_iso' => (string) ($row['local_iso'] ?? ''),
            'ra_decimal_hours' => isset($row['ra_decimal_hours']) ? (float) $row['ra_decimal_hours'] : null,
            'dec_decimal_deg' => isset($row['dec_decimal_deg']) ? (float) $row['dec_decimal_deg'] : null,
            'azimuth_deg' => $azimuthDeg,
            'altitude_deg' => $altitudeDeg,
        ];
    }

    $ephemerisChartRowsJson = json_encode($chartRows, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '[]';
    $ephemerisChartConfigJson = json_encode([
        'location' => [
            'name' => $defaultLocationName,
            'latitude' => $pageLocation['latitude'] ?? null,
            'longitude' => $pageLocation['longitude'] ?? null,
            'elevation' => $pageLocation['elevation'] ?? 0.0,
            'timezone' => $pageLocation['timezone'] ?? 'Europe/Berlin',
        ],
        'utcTimeIso' => $ephemerisWindowStartIso,
        'starLimit' => 4.4,
        'starLabelLimit' => 2.0,
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: 'null';
    $ephemerisStarDataJson = json_encode($chartStarData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '[]';
    $ephemerisLineStarDataJson = json_encode($chartLineStarData, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '[]';
    $ephemerisConstellationLinesJson = json_encode($chartConstellationLines, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '[]';
}

require __DIR__ . '/header.php';

?>

<style>
.ephemeriden-form {
    display: grid;
    gap: 0.8rem;
}

.ephemeriden-fields-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr)) auto;
    gap: 0.8rem;
    align-items: end;
}

.ephemeriden-submit-group {
    display: flex;
    align-items: flex-end;
}

.ephemeriden-results-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.9rem;
}

.ephemeriden-results-note {
    color: var(--text-dim);
    font-size: 0.92rem;
}

.ephemeriden-export-form {
    display: flex;
    align-items: center;
}

.ephemeriden-results-actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: wrap;
}

.ephemeriden-message {
    margin-bottom: 0.9rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card2);
}

.ephemeriden-message.is-error {
    border-color: rgba(190, 92, 92, 0.45);
    color: #ffd7d7;
}

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

.ephemeriden-table {
    width: 100%;
    border-collapse: collapse;
}

.ephemeriden-table th,
.ephemeriden-table td {
    padding: 0.75rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.ephemeriden-table th {
    color: var(--gold-pale);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.ephemeriden-table-empty td {
    color: var(--text-dim);
    white-space: normal;
}

.ephemeriden-chart-card[hidden] {
    display: none;
}

.ephemeriden-chart-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.9rem;
}

.ephemeriden-chart-note {
    color: var(--text-dim);
    font-size: 0.92rem;
}

.ephemeriden-chart-controls {
    display: flex;
    align-items: end;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.ephemeriden-chart-controls .form-group {
    min-width: 220px;
    margin: 0;
}

.ephemeriden-chart-stage {
    display: flex;
    justify-content: center;
    width: 100%;
}

.ephemeriden-chart-stage canvas {
    width: 100%;
    max-width: 760px;
    height: auto;
    display: block;
}

.ephemeriden-chart-legend {
    margin-top: 0.9rem;
    color: var(--text-dim);
    font-size: 0.9rem;
}

@media (max-width: 900px) {
    .ephemeriden-fields-row {
        grid-template-columns: repeat(2, minmax(180px, 1fr));
    }
}

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

<section class="card">
    <form method="post" class="ephemeriden-form">
        <div class="ephemeriden-fields-row">
            <div class="form-group">
                <label for="ephemeridenBody">Himmelskörper</label>
                <select id="ephemeridenBody" name="body">
                    <optgroup label="Sonne, Mond und Planeten">
                        <?php foreach ($planetOptions as $bodyValue => $bodyLabel): ?>
                            <option value="<?= ephemeriden_h($bodyValue) ?>"<?= $bodyValue === $selectedBody ? ' selected' : '' ?>><?= ephemeriden_h($bodyLabel) ?></option>
                        <?php endforeach; ?>
                    </optgroup>
                    <?php if ($favoriteMinorplanetOptions !== []): ?>
                        <optgroup label="Meine Kleinplaneten">
                            <?php foreach ($favoriteMinorplanetOptions as $bodyValue => $bodyLabel): ?>
                                <option value="<?= ephemeriden_h($bodyValue) ?>"<?= $bodyValue === $selectedBody ? ' selected' : '' ?>><?= ephemeriden_h($bodyLabel) ?></option>
                            <?php endforeach; ?>
                        </optgroup>
                    <?php endif; ?>
                    <?php if ($favoriteCometOptions !== []): ?>
                        <optgroup label="Meine Kometen">
                            <?php foreach ($favoriteCometOptions as $bodyValue => $bodyLabel): ?>
                                <option value="<?= ephemeriden_h($bodyValue) ?>"<?= $bodyValue === $selectedBody ? ' selected' : '' ?>><?= ephemeriden_h($bodyLabel) ?></option>
                            <?php endforeach; ?>
                        </optgroup>
                    <?php endif; ?>
                </select>
            </div>

            <div class="form-group">
                <label for="ephemeridenInterval">Intervall</label>
                <select id="ephemeridenInterval" name="interval_minutes">
                    <?php foreach ($intervalOptions as $intervalValue => $intervalLabel): ?>
                        <option value="<?= ephemeriden_h($intervalValue) ?>"<?= (string) $intervalValue === $selectedInterval ? ' selected' : '' ?>><?= ephemeriden_h($intervalLabel) ?></option>
                    <?php endforeach; ?>
                </select>
            </div>

            <div class="form-group">
                <label for="ephemeridenStartDt">Startdatum &amp; Uhrzeit</label>
                <input
                    type="datetime-local"
                    id="ephemeridenStartDt"
                    name="start_dt"
                    value="<?= ephemeriden_h($startDtInput !== '' ? $startDtInput : (new DateTimeImmutable('now', new DateTimeZone($pageLocation['timezone'] ?? 'Europe/Berlin')))->format('Y-m-d\TH:i')) ?>"
                >
            </div>

            <div class="form-group">
                <label for="ephemeridenEndDt">Enddatum &amp; Uhrzeit</label>
                <input
                    type="datetime-local"
                    id="ephemeridenEndDt"
                    name="end_dt"
                    value="<?= ephemeriden_h($endDtInput !== '' ? $endDtInput : (new DateTimeImmutable('+7 days', new DateTimeZone($pageLocation['timezone'] ?? 'Europe/Berlin')))->format('Y-m-d\TH:i')) ?>"
                    required
                >
            </div>

            <div class="ephemeriden-submit-group">
                <button type="submit" class="btn btn-primary">Berechnen</button>
            </div>
        </div>
    </form>
</section>

<section class="card mt-md">
    <div class="ephemeriden-results-head">
        <div>
            <h2>Ephemeriden</h2>
            <div class="ephemeriden-results-note">
                Standard-Standort:
                <strong><?= ephemeriden_h($defaultLocationName !== '' ? $defaultLocationName : 'nicht verfügbar') ?></strong>
            </div>
        </div>
        <?php if ($ephemerisRows !== []): ?>
            <div class="ephemeriden-results-actions">
                <button type="button" class="btn btn-secondary" id="ephemeridenChartToggle" aria-expanded="false" aria-controls="ephemeridenChartCard">Karte anzeigen</button>
                <form method="post" class="ephemeriden-export-form">
                    <input type="hidden" name="body" value="<?= ephemeriden_h($selectedBody) ?>">
                    <input type="hidden" name="interval_minutes" value="<?= ephemeriden_h($selectedInterval) ?>">
                    <input type="hidden" name="range_value" value="<?= ephemeriden_h($rangeValueInput) ?>">
                    <input type="hidden" name="range_unit" value="<?= ephemeriden_h($selectedRangeUnit) ?>">
                    <input type="hidden" name="start_dt" value="<?= ephemeriden_h($startDtInput) ?>">
                    <input type="hidden" name="export_format" value="csv">
                    <button type="submit" class="btn btn-secondary">Export CSV</button>
                </form>
            </div>
        <?php endif; ?>
    </div>

    <?php if ($errorMessage !== ''): ?>
        <div class="ephemeriden-message is-error"><?= ephemeriden_h($errorMessage) ?></div>
    <?php endif; ?>

    <div class="ephemeriden-table-wrap">
        <table class="ephemeriden-table">
            <thead>
                <tr>
                    <th>Name des Objekts</th>
                    <th>Datum</th>
                    <th>Uhrzeit</th>
                    <th>RA (J2000)</th>
                    <th>Dek (J2000)</th>
                    <th>Aufgang</th>
                    <th>Untergang</th>
                </tr>
            </thead>
            <tbody>
                <?php if ($ephemerisRows !== []): ?>
                    <?php foreach ($ephemerisRows as $row): ?>
                        <tr>
                            <td><?= ephemeriden_h((string) ($row['object_name'] ?? '')) ?></td>
                            <td><?= ephemeriden_h((string) ($row['date_local'] ?? '')) ?></td>
                            <td><?= ephemeriden_h((string) ($row['time_local'] ?? '')) ?></td>
                            <td><?= ephemeriden_h((string) ($row['ra'] ?? '')) ?></td>
                            <td><?= ephemeriden_h((string) ($row['dec'] ?? '')) ?></td>
                            <td><?= ephemeriden_h((string) (($row['rise'] ?? null) ?? '—')) ?></td>
                            <td><?= ephemeriden_h((string) (($row['set'] ?? null) ?? '—')) ?></td>
                        </tr>
                    <?php endforeach; ?>
                <?php elseif ($_SERVER['REQUEST_METHOD'] === 'POST' && $errorMessage === ''): ?>
                    <tr class="ephemeriden-table-empty">
                        <td colspan="7">Für die gewählte Anfrage wurden keine Tabellenzeilen erzeugt.</td>
                    </tr>
                <?php else: ?>
                    <tr class="ephemeriden-table-empty">
                        <td colspan="7">Noch keine Berechnung ausgeführt.</td>
                    </tr>
                <?php endif; ?>
            </tbody>
        </table>
    </div>
</section>

<?php if ($ephemerisRows !== []): ?>
    <section class="card mt-md ephemeriden-chart-card" id="ephemeridenChartCard" hidden>
        <div class="ephemeriden-chart-head">
            <div>
                <h2>Ephemeridenkarte</h2>
                <div class="ephemeriden-chart-note">
                    Polare Himmelsansicht für <strong><?= ephemeriden_h((string) ($bodyOptions[$selectedBody] ?? 'Objekt')) ?></strong> am Standort <strong><?= ephemeriden_h($defaultLocationName !== '' ? $defaultLocationName : 'nicht verfügbar') ?></strong>
                </div>
            </div>
            <div class="ephemeriden-chart-controls">
                <div class="form-group">
                    <label for="ephemeridenChartPoint">Kartenzeitpunkt</label>
                    <select id="ephemeridenChartPoint">
                        <?php foreach ($ephemerisRows as $rowIndex => $row): ?>
                            <option value="<?= ephemeriden_h((string) $rowIndex) ?>"><?= ephemeriden_h((string) ($row['date_local'] ?? '') . ' ' . (string) ($row['time_local'] ?? '')) ?></option>
                        <?php endforeach; ?>
                    </select>
                </div>
                <div class="form-group">
                    <label for="ephemeridenChartTime">Kartenuhrzeit</label>
                    <input type="time" id="ephemeridenChartTime" step="60" value="<?= ephemeriden_h((string) ($ephemerisRows[0]['time_local'] ?? '00:00')) ?>">
                </div>
                <div class="form-group">
                    <label for="ephemeridenChartLabelStep">Beschriftung</label>
                    <select id="ephemeridenChartLabelStep">
                        <?php foreach ([2, 3, 4, 5, 6, 8, 10] as $labelStepOption): ?>
                            <option value="<?= ephemeriden_h((string) $labelStepOption) ?>"<?= $labelStepOption === 4 ? ' selected' : '' ?>>jeder <?= ephemeriden_h((string) $labelStepOption) ?>. Punkt</option>
                        <?php endforeach; ?>
                    </select>
                </div>
                <div class="form-group">
                    <label for="ephemeridenChartLabelRotation">Textausrichtung</label>
                    <select id="ephemeridenChartLabelRotation">
                        <?php foreach (range(-165, 165, 15) as $deg): ?>
                            <option value="<?= ephemeriden_h((string) $deg) ?>"<?= $deg === -45 ? ' selected' : '' ?>><?= ephemeriden_h($deg > 0 ? "+$deg" : (string) $deg) ?>°</option>
                        <?php endforeach; ?>
                    </select>
                </div>
                <div class="ephemeriden-submit-group">
                    <button type="button" class="btn btn-secondary" id="ephemeridenChartApply">Karte neu berechnen</button>
                    <button type="button" class="btn btn-secondary" id="ephemeridenChartExport">Als PNG exportieren</button>
                </div>
            </div>
        </div>
        <div class="ephemeriden-chart-stage">
            <canvas id="ephemeridenPolarCanvas" width="900" height="900" aria-label="Polarkarte der berechneten Ephemeriden"></canvas>
        </div>
        <div class="ephemeriden-chart-legend">
            Der äußere Kreis ist der Horizont, die Mitte ist der Zenit. Die Bahn wird in der Reihenfolge der Ephemeridenpunkte eingezeichnet.
        </div>
    </section>
<?php endif; ?>

<?php if ($ephemerisRows !== []): ?>
<script src="js/astronomy.browser.min.js"></script>
<script>
const EPHEMERIDEN_CHART_ROWS = <?= $ephemerisChartRowsJson ?>;
const EPHEMERIDEN_CHART_CONFIG = <?= $ephemerisChartConfigJson ?>;
const EPHEMERIDEN_CHART_STARS = <?= $ephemerisStarDataJson ?>;
const EPHEMERIDEN_CHART_LINE_STARS = <?= $ephemerisLineStarDataJson ?>;
const EPHEMERIDEN_CHART_CONSTELLATIONS = <?= $ephemerisConstellationLinesJson ?>;

(function () {
    const toggleButton = document.getElementById('ephemeridenChartToggle');
    const chartCard = document.getElementById('ephemeridenChartCard');
    const canvas = document.getElementById('ephemeridenPolarCanvas');
    const pointSelect = document.getElementById('ephemeridenChartPoint');
    const timeInput = document.getElementById('ephemeridenChartTime');
    const labelStepSelect = document.getElementById('ephemeridenChartLabelStep');
    const labelRotationSelect = document.getElementById('ephemeridenChartLabelRotation');
    const applyButton = document.getElementById('ephemeridenChartApply');

    const logoImage = new Image();
    logoImage.src = 'images/logoAM_sw.png';
    logoImage.onload = () => { if (!chartCard.hidden) { drawChart(); } };

    if (!toggleButton || !chartCard || !canvas || !pointSelect || !timeInput || !labelStepSelect || !labelRotationSelect || !applyButton || !Array.isArray(EPHEMERIDEN_CHART_ROWS) || EPHEMERIDEN_CHART_ROWS.length === 0) {
        return;
    }

    const ctx = canvas.getContext('2d');
    const observer = window.Astronomy && EPHEMERIDEN_CHART_CONFIG && EPHEMERIDEN_CHART_CONFIG.location
        ? new Astronomy.Observer(
            Number(EPHEMERIDEN_CHART_CONFIG.location.latitude),
            Number(EPHEMERIDEN_CHART_CONFIG.location.longitude),
            Number(EPHEMERIDEN_CHART_CONFIG.location.elevation || 0)
        )
        : null;
    let occupiedBoxes = [];
    const starByHip = new Map();
    const constellationHipSet = new Set();
    const displayStarMap = new Map();

    for (const star of EPHEMERIDEN_CHART_LINE_STARS) {
        if (Number.isFinite(Number(star.hip))) {
            starByHip.set(Number(star.hip), star);
        }
    }

    for (const star of EPHEMERIDEN_CHART_STARS) {
        if (Number.isFinite(Number(star.hip))) {
            displayStarMap.set(Number(star.hip), star);
        } else {
            displayStarMap.set(`star-${displayStarMap.size}`, star);
        }
    }

    for (const constellation of EPHEMERIDEN_CHART_CONSTELLATIONS) {
        if (!Array.isArray(constellation.lines)) {
            continue;
        }

        for (const segment of constellation.lines) {
            if (!Array.isArray(segment)) {
                continue;
            }

            for (const hip of segment) {
                if (Number.isFinite(Number(hip))) {
                    constellationHipSet.add(Number(hip));
                }
            }
        }
    }

    for (const hip of constellationHipSet) {
        if (!displayStarMap.has(hip) && starByHip.has(hip)) {
            displayStarMap.set(hip, starByHip.get(hip));
        }
    }

    function projectPoint(azimuthDeg, altitudeDeg, radius, centerX, centerY) {
        if (!Number.isFinite(azimuthDeg) || !Number.isFinite(altitudeDeg) || altitudeDeg < 0) {
            return null;
        }

        const rho = (90 - altitudeDeg) / 90;
        const azimuthRad = azimuthDeg * Math.PI / 180;

        return {
            x: centerX - rho * radius * Math.sin(azimuthRad),
            y: centerY - rho * radius * Math.cos(azimuthRad),
        };
    }

    function clamp01(value) {
        return Math.max(0, Math.min(1, value));
    }

    function resetLabelBoxes() {
        occupiedBoxes = [];
    }

    function getSelectedIndex() {
        const rawValue = Number(pointSelect.value);
        if (!Number.isInteger(rawValue) || rawValue < 0 || rawValue >= EPHEMERIDEN_CHART_ROWS.length) {
            return 0;
        }

        return rawValue;
    }

    function getSelectedRow() {
        return EPHEMERIDEN_CHART_ROWS[getSelectedIndex()] || null;
    }

    function extractRowDateParts(localIso) {
        const isoText = String(localIso || '');
        const match = isoText.match(/^(\d{4}-\d{2}-\d{2})T\d{2}:\d{2}(?::\d{2})?(.+)$/);
        if (!match) {
            return null;
        }

        return {
            datePart: match[1],
            offsetPart: match[2],
        };
    }

    function getChartTimeValue() {
        const value = String(timeInput.value || '').trim();
        return /^\d{2}:\d{2}$/.test(value) ? value : null;
    }

    function getLabelStepValue() {
        const value = Number(labelStepSelect.value);
        return Number.isInteger(value) && value >= 1 ? value : 4;
    }

    function getLabelRotationValue() {
        const value = Number(labelRotationSelect.value);
        return Number.isFinite(value) ? value : 45;
    }

    function syncChartTimeFromSelectedRow() {
        const selectedRow = getSelectedRow();
        if (!selectedRow || !selectedRow.time_local) {
            return;
        }

        timeInput.value = String(selectedRow.time_local).slice(0, 5);
    }

    function getChartDate() {
        const selectedRow = getSelectedRow();
        const timeValue = getChartTimeValue();
        if (!selectedRow || !selectedRow.local_iso || !timeValue) {
            return null;
        }

        const dateParts = extractRowDateParts(selectedRow.local_iso);
        if (!dateParts) {
            return null;
        }

        const chartDate = new Date(`${dateParts.datePart}T${timeValue}:00${dateParts.offsetPart}`);
        return Number.isNaN(chartDate.getTime()) ? null : chartDate;
    }

    function drawLabel(text, x, y, options = {}) {
        if (!text) {
            return false;
        }

        const font = options.font || '600 11px Rajdhani, sans-serif';
        const color = options.color || 'rgba(232, 239, 255, 0.82)';
        const align = options.align || 'left';
        const baseline = options.baseline || 'middle';
        const padding = options.padding ?? 2;
        const rotationDeg = Number(options.rotationDeg || 0);
        const backgroundColor = options.backgroundColor || '';
        const force = options.force === true;

        ctx.save();
        ctx.font = font;
        const metrics = ctx.measureText(text);
        const textWidth = metrics.width;
        const ascent = metrics.actualBoundingBoxAscent || 8;
        const descent = metrics.actualBoundingBoxDescent || 4;
        const textHeight = ascent + descent;

        let localX = 0;
        if (align === 'center') {
            localX = -textWidth / 2;
        } else if (align === 'right') {
            localX = -textWidth;
        }

        let localY = -ascent;
        if (baseline === 'middle') {
            localY = -(ascent + descent) / 2;
        } else if (baseline === 'bottom' || baseline === 'alphabetic') {
            localY = -ascent - descent;
        }

        const rectX = localX - padding;
        const rectY = localY - padding;
        const rectWidth = textWidth + padding * 2;
        const rectHeight = textHeight + padding * 2;
        const rotationRad = rotationDeg * Math.PI / 180;
        const corners = [
            { x: rectX, y: rectY },
            { x: rectX + rectWidth, y: rectY },
            { x: rectX + rectWidth, y: rectY + rectHeight },
            { x: rectX, y: rectY + rectHeight },
        ].map((corner) => ({
            x: x + corner.x * Math.cos(rotationRad) - corner.y * Math.sin(rotationRad),
            y: y + corner.x * Math.sin(rotationRad) + corner.y * Math.cos(rotationRad),
        }));

        const box = {
            x: Math.min(...corners.map((corner) => corner.x)),
            y: Math.min(...corners.map((corner) => corner.y)),
            width: Math.max(...corners.map((corner) => corner.x)) - Math.min(...corners.map((corner) => corner.x)),
            height: Math.max(...corners.map((corner) => corner.y)) - Math.min(...corners.map((corner) => corner.y)),
        };

        const overlaps = occupiedBoxes.some((other) =>
            box.x < other.x + other.width &&
            box.x + box.width > other.x &&
            box.y < other.y + other.height &&
            box.y + box.height > other.y
        );

        if (!overlaps || force) {
            occupiedBoxes.push(box);
            ctx.translate(x, y);
            if (rotationDeg !== 0) {
                ctx.rotate(rotationRad);
            }
            ctx.textAlign = align;
            ctx.textBaseline = baseline;
            if (backgroundColor !== '') {
                ctx.fillStyle = backgroundColor;
                ctx.fillRect(rectX, rectY, rectWidth, rectHeight);
            }
            ctx.fillStyle = color;
            ctx.fillText(text, 0, 0);
            ctx.restore();
            return true;
        }

        ctx.restore();
        return false;
    }

    function starHorizon(star) {
        const chartDate = getChartDate();
        if (!window.Astronomy || !observer || !chartDate) {
            return null;
        }

        const raHours = Number(star.ra) * (12 / Math.PI);
        const decDeg = Number(star.dec) * (180 / Math.PI);
        return Astronomy.Horizon(chartDate, observer, raHours, decDeg, 'normal');
    }

    function ephemerisHorizon(row) {
        const chartDate = getChartDate();
        if (!window.Astronomy || !observer || !chartDate) {
            return null;
        }

        const raHours = Number(row.ra_decimal_hours);
        const decDeg = Number(row.dec_decimal_deg);
        if (!Number.isFinite(raHours) || !Number.isFinite(decDeg)) {
            return null;
        }

        return Astronomy.Horizon(chartDate, observer, raHours, decDeg, 'normal');
    }

    function starColor(star) {
        if (typeof star.ci === 'number') {
            if (star.ci < -0.1) return '#b9d4ff';
            if (star.ci < 0.3) return '#dbe7ff';
            if (star.ci < 0.7) return '#fff6e0';
            if (star.ci < 1.1) return '#ffe0b5';
            return '#ffc98a';
        }

        const spect = String(star.spect || '').trim().toUpperCase();
        if (spect.startsWith('O') || spect.startsWith('B')) return '#b9d4ff';
        if (spect.startsWith('A')) return '#dbe7ff';
        if (spect.startsWith('F') || spect.startsWith('G')) return '#fff6e0';
        if (spect.startsWith('K')) return '#ffd4a0';
        if (spect.startsWith('M')) return '#ffbd85';
        return '#f4f7ff';
    }

    function getStarLabel(star) {
        const proper = String(star.proper || '').trim();
        if (proper !== '') {
            return proper;
        }

        const bayer = String(star.bayer || '').trim();
        const con = String(star.con || '').trim();
        if (bayer !== '') {
            return con !== '' ? `${bayer} ${con}` : bayer;
        }

        return '';
    }

    function drawStars(centerX, centerY, radius, scale) {
        if (!window.Astronomy || !observer || !getChartDate() || !Array.isArray(EPHEMERIDEN_CHART_STARS)) {
            return;
        }

        for (const star of displayStarMap.values()) {
            const hip = Number(star.hip);
            const isConstellationStar = Number.isFinite(hip) && constellationHipSet.has(hip);

            if (!isConstellationStar && Number(star.mag) > Number(EPHEMERIDEN_CHART_CONFIG.starLimit || 4.4)) {
                continue;
            }

            const hor = starHorizon(star);
            if (!hor || hor.altitude < 0) {
                continue;
            }

            const pt = projectPoint(hor.azimuth, hor.altitude, radius, centerX, centerY);
            if (!pt) {
                continue;
            }

            const magRange = Math.max(0.5, Number(EPHEMERIDEN_CHART_CONFIG.starLimit || 4.4) + 1.6);
            const effectiveMagnitude = isConstellationStar
                ? Math.min(Number(star.mag), Number(EPHEMERIDEN_CHART_CONFIG.starLimit || 4.4) + 0.35)
                : Number(star.mag);
            const brightness = clamp01((Number(EPHEMERIDEN_CHART_CONFIG.starLimit || 4.4) - effectiveMagnitude + 1.6) / magRange);
            const starRadius = ((isConstellationStar ? 0.85 : 0.65) + Math.pow(brightness, 1.9) * 5.2) * scale;
            const glowRadius = starRadius * (effectiveMagnitude <= 1 ? 2.8 : 1.9);
            const color = starColor(star);

            const glow = ctx.createRadialGradient(pt.x, pt.y, 0, pt.x, pt.y, glowRadius);
            glow.addColorStop(0, color + '66');
            glow.addColorStop(0.35, color + '22');
            glow.addColorStop(1, color + '00');
            ctx.fillStyle = glow;
            ctx.beginPath();
            ctx.arc(pt.x, pt.y, glowRadius, 0, Math.PI * 2);
            ctx.fill();

            ctx.fillStyle = color;
            ctx.beginPath();
            ctx.arc(pt.x, pt.y, starRadius, 0, Math.PI * 2);
            ctx.fill();

            if (Number(star.mag) <= 0.8) {
                ctx.strokeStyle = color + '44';
                ctx.lineWidth = scale;
                ctx.beginPath();
                ctx.moveTo(pt.x - starRadius * 1.35, pt.y);
                ctx.lineTo(pt.x + starRadius * 1.35, pt.y);
                ctx.moveTo(pt.x, pt.y - starRadius * 1.35);
                ctx.lineTo(pt.x, pt.y + starRadius * 1.35);
                ctx.stroke();
            }

            if (Number(star.mag) <= Number(EPHEMERIDEN_CHART_CONFIG.starLabelLimit || 2.0)) {
                const label = getStarLabel(star);
                if (label !== '') {
                    drawLabel(label, pt.x + starRadius + 5 * scale, pt.y - 1, {
                        font: `600 ${Math.round(11 * scale)}px Rajdhani, sans-serif`,
                        color: 'rgba(232, 239, 255, 0.82)',
                        align: 'left',
                        baseline: 'middle',
                        padding: 2 * scale,
                    });
                }
            }
        }
    }

    function drawConstellationLines(centerX, centerY, radius, scale) {
        if (!window.Astronomy || !observer || !getChartDate() || !Array.isArray(EPHEMERIDEN_CHART_CONSTELLATIONS)) {
            return;
        }

        for (const constellation of EPHEMERIDEN_CHART_CONSTELLATIONS) {
            if (!Array.isArray(constellation.lines)) {
                continue;
            }

            for (const segment of constellation.lines) {
                if (!Array.isArray(segment) || segment.length < 2) {
                    continue;
                }

                const points = [];

                for (const hip of segment) {
                    const star = starByHip.get(Number(hip));
                    if (!star) {
                        continue;
                    }

                    const hor = starHorizon(star);
                    if (!hor || hor.altitude < 0) {
                        continue;
                    }

                    const pt = projectPoint(hor.azimuth, hor.altitude, radius, centerX, centerY);
                    if (!pt) {
                        continue;
                    }

                    points.push(pt);
                }

                if (points.length < 2) {
                    continue;
                }

                ctx.save();
                ctx.lineCap = 'round';
                ctx.lineJoin = 'round';

                ctx.strokeStyle = 'rgba(210, 214, 224, 0.16)';
                ctx.lineWidth = 2.1 * scale;
                ctx.beginPath();
                ctx.moveTo(points[0].x, points[0].y);
                for (let index = 1; index < points.length; index += 1) {
                    ctx.lineTo(points[index].x, points[index].y);
                }
                ctx.stroke();

                ctx.strokeStyle = 'rgba(36, 40, 48, 0.34)';
                ctx.lineWidth = 0.95 * scale;
                ctx.beginPath();
                ctx.moveTo(points[0].x + 0.18, points[0].y - 0.12);
                for (let index = 1; index < points.length; index += 1) {
                    const jitterX = index % 2 === 0 ? 0.22 : -0.12;
                    const jitterY = index % 2 === 0 ? -0.14 : 0.2;
                    ctx.lineTo(points[index].x + jitterX, points[index].y + jitterY);
                }
                ctx.stroke();

                ctx.restore();
            }
        }
    }

    function resizeCanvas() {
        const cssSize = Math.max(320, Math.min(canvas.parentElement.clientWidth, 760));
        const ratio = Math.min(window.devicePixelRatio || 1, 2);
        canvas.width = Math.round(cssSize * ratio);
        canvas.height = Math.round(cssSize * ratio);
        canvas.style.width = cssSize + 'px';
        canvas.style.height = cssSize + 'px';
        ctx.setTransform(1, 0, 0, 1, 0, 0);
        ctx.scale(ratio, ratio);
        drawChart();
    }

    function drawCircleLabel(text, x, y, scale) {
        ctx.save();
        ctx.font = `${Math.round(12 * scale)}px Space Mono, monospace`;
        ctx.fillStyle = 'rgba(232, 239, 255, 0.76)';
        ctx.textAlign = 'center';
        ctx.textBaseline = 'middle';
        ctx.fillText(text, x, y);
        ctx.restore();
    }

    function drawChart(overrideSize) {
        const width = overrideSize ?? canvas.clientWidth;
        const height = overrideSize ?? canvas.clientHeight;
        const scale = width / (canvas.clientWidth || width);
        const centerX = width / 2;
        const centerY = height / 2;
        const radius = Math.min(width, height) * 0.43;
        const selectedRow = getSelectedRow();
        resetLabelBoxes();

        ctx.clearRect(0, 0, width, height);
        ctx.fillStyle = '#06080f';
        ctx.fillRect(0, 0, width, height);

        const background = ctx.createRadialGradient(centerX, centerY, radius * 0.05, centerX, centerY, radius);
        background.addColorStop(0, 'rgba(8, 12, 22, 0.98)');
        background.addColorStop(0.68, 'rgba(5, 10, 18, 0.94)');
        background.addColorStop(1, 'rgba(4, 8, 15, 0.98)');
        ctx.fillStyle = background;
        ctx.beginPath();
        ctx.arc(centerX, centerY, radius, 0, Math.PI * 2);
        ctx.fill();

        ctx.strokeStyle = 'rgba(130, 170, 255, 0.18)';
        ctx.lineWidth = scale;
        [0, 30, 60].forEach((altitude) => {
            const ringRadius = radius * ((90 - altitude) / 90);
            ctx.beginPath();
            ctx.arc(centerX, centerY, ringRadius, 0, Math.PI * 2);
            ctx.stroke();
            drawCircleLabel(`${altitude}°`, centerX, centerY - ringRadius - 12 * scale, scale);
        });

        ctx.beginPath();
        ctx.moveTo(centerX, centerY - radius);
        ctx.lineTo(centerX, centerY + radius);
        ctx.moveTo(centerX - radius, centerY);
        ctx.lineTo(centerX + radius, centerY);
        ctx.strokeStyle = 'rgba(130, 170, 255, 0.14)';
        ctx.stroke();

        drawCircleLabel('N', centerX, centerY - radius - 20 * scale, scale);
        drawCircleLabel('W', centerX + radius + 20 * scale, centerY, scale);
        drawCircleLabel('S', centerX, centerY + radius + 20 * scale, scale);
        drawCircleLabel('O', centerX - radius - 20 * scale, centerY, scale);
        drawCircleLabel('Zenit', centerX, centerY, scale);
        drawConstellationLines(centerX, centerY, radius, scale);
        drawStars(centerX, centerY, radius, scale);

        const visiblePoints = EPHEMERIDEN_CHART_ROWS
            .map((row, rowIndex) => {
                const horizon = ephemerisHorizon(row);
                const azimuthDeg = horizon ? Number(horizon.azimuth) : Number(row.azimuth_deg);
                const altitudeDeg = horizon ? Number(horizon.altitude) : Number(row.altitude_deg);

                return {
                    index: rowIndex,
                    label: `${row.date_local}`,
                    azimuthDeg,
                    altitudeDeg,
                    point: projectPoint(azimuthDeg, altitudeDeg, radius, centerX, centerY),
                };
            })
            .filter((entry) => entry.point !== null);

        if (visiblePoints.length === 0) {
            ctx.save();
            ctx.font = '14px Space Mono, monospace';
            ctx.fillStyle = 'rgba(232, 239, 255, 0.72)';
            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            ctx.fillText('Für die berechneten Punkte liegt das Objekt unter dem Horizont.', centerX, centerY);
            ctx.restore();
            return;
        }

        ctx.beginPath();
        visiblePoints.forEach((entry, index) => {
            if (index === 0) {
                ctx.moveTo(entry.point.x, entry.point.y);
            } else {
                ctx.lineTo(entry.point.x, entry.point.y);
            }
        });
        ctx.strokeStyle = 'rgba(246, 206, 97, 0.92)';
        ctx.lineWidth = 2.6 * scale;
        ctx.shadowColor = 'rgba(246, 206, 97, 0.32)';
        ctx.shadowBlur = 10 * scale;
        ctx.stroke();
        ctx.shadowBlur = 0;

        const labelStep = getLabelStepValue();
        const labelRotation = getLabelRotationValue();
        resetLabelBoxes();
        visiblePoints.forEach((entry, index) => {
            const isFirst = index === 0;
            const isLast = index === visiblePoints.length - 1;

            ctx.beginPath();
            ctx.arc(entry.point.x, entry.point.y, 3.5 * scale, 0, Math.PI * 2);
            ctx.fillStyle = 'rgba(255, 236, 190, 0.96)';
            ctx.fill();

            if (isFirst || isLast || (index % labelStep === 0)) {
                drawLabel(entry.label, entry.point.x + 10 * scale, entry.point.y - 8 * scale, {
                    font: `${Math.round(11 * scale)}px Space Mono, monospace`,
                    color: 'rgba(232, 239, 255, 0.88)',
                    align: 'left',
                    baseline: 'bottom',
                    padding: 4 * scale,
                    rotationDeg: labelRotation,
                    backgroundColor: 'rgba(7, 10, 18, 0.82)',
                    force: true,
                });
            }
        });


        if (logoImage.complete && logoImage.naturalWidth > 0) {
            const logoH = Math.round(width * 0.07);
            const logoW = Math.round(logoH * logoImage.naturalWidth / logoImage.naturalHeight);
            ctx.save();
            ctx.globalAlpha = 0.82;
            ctx.drawImage(logoImage, width - logoW - 14, height - logoH - 14, logoW, logoH);
            ctx.restore();
        }
    }

    toggleButton.addEventListener('click', () => {
        const willOpen = chartCard.hidden;
        chartCard.hidden = !willOpen;
        toggleButton.setAttribute('aria-expanded', willOpen ? 'true' : 'false');
        toggleButton.textContent = willOpen ? 'Karte ausblenden' : 'Karte anzeigen';

        if (willOpen) {
            resizeCanvas();
            chartCard.scrollIntoView({ behavior: 'smooth', block: 'start' });
        }
    });

    window.addEventListener('resize', () => {
        if (!chartCard.hidden) {
            resizeCanvas();
        }
    });

    pointSelect.addEventListener('change', () => {
        syncChartTimeFromSelectedRow();
    });

    applyButton.addEventListener('click', () => {
        if (!chartCard.hidden) {
            drawChart();
        }
    });

    const exportButton = document.getElementById('ephemeridenChartExport');
    if (exportButton) {
        exportButton.addEventListener('click', () => {
            const exportSize = 2000;
            const sw = canvas.width;
            const sh = canvas.height;

            canvas.width = exportSize;
            canvas.height = exportSize;
            ctx.setTransform(1, 0, 0, 1, 0, 0);
            drawChart(exportSize);

            const link = document.createElement('a');
            link.download = 'ephemeriden.png';
            link.href = canvas.toDataURL('image/png');
            link.click();

            canvas.width = sw;
            canvas.height = sh;
            ctx.setTransform(1, 0, 0, 1, 0, 0);
            const ratio = Math.min(window.devicePixelRatio || 1, 2);
            ctx.scale(ratio, ratio);
            drawChart();
        });
    }

    syncChartTimeFromSelectedRow();
})();
</script>
<?php endif; ?>

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