<?php
declare(strict_types=1);

session_start();

$loggedIn = isset($_SESSION['user_id']);

if (!function_exists('h')) {
    function h(?string $value): string { return htmlspecialchars((string)$value, ENT_QUOTES, 'UTF-8'); }
}
if (!function_exists('risesetTime')) {
    function risesetTime(array $ev, string $key): string { return (!empty($ev[$key]['found'])) ? htmlspecialchars($ev[$key]['local_time'], ENT_QUOTES, 'UTF-8') : '—'; }
}
if (!function_exists('fmtLocalTime')) {
    function fmtLocalTime(string $utcIso, string $tz): string { return (new DateTime($utcIso))->setTimezone(new DateTimeZone($tz))->format('H:i'); }
}
if (!function_exists('azDir')) {
    function azDir(float $az): string { $dirs = ['N','NO','O','SO','S','SW','W','NW']; return $dirs[(int)round($az / 45) % 8]; }
}

function idx_tleChecksum(string $line): int
{
    $sum = 0;
    for ($i = 0; $i < 68; $i++) {
        $c = $line[$i];
        if (ctype_digit($c)) $sum += (int)$c;
        elseif ($c === '-') $sum += 1;
    }
    return $sum % 10;
}
function idx_tleExp(float $val): string
{
    if (abs($val) < 1e-99) return ' 00000-0';
    $sign = $val >= 0 ? '+' : '-';
    $abs = abs($val);
    $exp = (int)floor(log10($abs)) + 1;
    $mantissa = (int)round($abs / pow(10, $exp) * 1e5);
    if ($mantissa >= 100000) { $mantissa = 10000; $exp++; }
    return sprintf('%s%05d%s%d', $sign, $mantissa, $exp >= 0 ? '+' : '-', abs($exp));
}
function idx_tleMmDot(float $val): string
{
    return sprintf('%s.%08d', $val >= 0 ? ' ' : '-', (int)round(abs($val) * 1e8));
}
function idx_tleEpoch(string $epochStr): string
{
    $dt   = new DateTimeImmutable($epochStr, new DateTimeZone('UTC'));
    $yy   = (int)$dt->format('Y') % 100;
    $jan1 = new DateTimeImmutable($dt->format('Y') . '-01-01 00:00:00', new DateTimeZone('UTC'));
    $day  = ((float)$dt->format('U') - (float)$jan1->format('U')) / 86400.0 + 1.0;
    return sprintf('%02d%012.8f', $yy, $day);
}
function idx_tleIntlDesig(?string $id): string
{
    if (!$id) return str_repeat(' ', 8);
    if (preg_match('/^(\d{4})-(\d+)([A-Z]*)$/i', trim($id), $m)) {
        $yy = substr($m[1], 2, 2);
        return substr(str_pad($yy . str_pad($m[2], 3, '0', STR_PAD_LEFT) . str_pad(strtoupper($m[3]), 3), 8), 0, 8);
    }
    return str_pad(substr($id, 0, 8), 8);
}
function buildTleLine1(array $sat, array $tle): string
{
    $line = sprintf('1 %05d%1s %-8s %14s %10s %8s %8s %1d %4d',
        (int)$sat['norad_cat_id'],
        in_array($sat['classification_type'] ?? '', ['U','C','S'], true) ? $sat['classification_type'] : 'U',
        idx_tleIntlDesig($sat['object_id'] ?? null),
        idx_tleEpoch((string)$tle['epoch']),
        idx_tleMmDot((float)($tle['mean_motion_dot'] ?? 0)),
        idx_tleExp((float)($tle['mean_motion_ddot'] ?? 0)),
        idx_tleExp((float)($tle['bstar'] ?? 0)),
        (int)($tle['ephemeris_type'] ?? 0),
        (int)($tle['element_set_no'] ?? 0)
    );
    $line = str_pad($line, 68);
    return $line . idx_tleChecksum($line);
}
function buildTleLine2(array $sat, array $tle): string
{
    $ecc = (float)($tle['eccentricity'] ?? 0);
    $line = sprintf('2 %05d %8.4f %8.4f %7s %8.4f %8.4f %11.8f%5d',
        (int)$sat['norad_cat_id'],
        (float)($tle['inclination'] ?? 0),
        (float)($tle['ra_of_asc_node'] ?? 0),
        substr(sprintf('%.7f', $ecc), 2),
        (float)($tle['arg_of_pericenter'] ?? 0),
        (float)($tle['mean_anomaly'] ?? 0),
        (float)($tle['mean_motion'] ?? 0),
        (int)($tle['rev_at_epoch'] ?? 0)
    );
    $line = str_pad($line, 68);
    return $line . idx_tleChecksum($line);
}

// Standort und astronomische Daten nur wenn eingeloggt und Standort vorhanden
$skyData    = null;
$planetData = null;
$satData    = null;
$pyError    = null;
$satError   = null;

if ($loggedIn) {
    // header.php lädt $currentLocation – wir brauchen ihn vorab
    $config = require __DIR__ . '/../config/database.php';
    $pdo = new PDO(
        sprintf('mysql:host=%s;dbname=%s;charset=%s', $config['host'], $config['dbname'], $config['charset'] ?? 'utf8mb4'),
        $config['user'],
        $config['pass'],
        [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC]
    );

    $stmtLoc = $pdo->prepare(
        'SELECT 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;

    if ($defaultLocation) {
        $lat  = (float)$defaultLocation['latitude'];
        $lon  = (float)$defaultLocation['longitude'];
        $elev = (float)($defaultLocation['elevation'] ?? 0);
        $tz   = $defaultLocation['timezone'] ?? 'Europe/Berlin';
        $date = (new DateTimeImmutable('now', new DateTimeZone($tz)))->format('Y-m-d');

        $scriptPath = realpath(__DIR__ . '/py/api.py');
        if (PHP_OS_FAMILY === 'Windows') {
            $pythonBin = 'python';
        } elseif (file_exists('/usr/bin/python3')) {
            $pythonBin = '/usr/bin/python3';
        } elseif (file_exists('/usr/bin/python')) {
            $pythonBin = '/usr/bin/python';
        } else {
            $pythonBin = 'python';
        }
        putenv('PYTHONUTF8=1');
        putenv('PYTHONIOENCODING=utf-8');

        // Sonne + Mond
        $args = [
            $pythonBin,
            escapeshellarg($scriptPath),
            escapeshellarg('sun_moon_rise_set'),
            escapeshellarg((string)$lat),
            escapeshellarg((string)$lon),
            escapeshellarg((string)$elev),
            escapeshellarg($date),
            escapeshellarg($tz),
        ];
        $cmd = implode(' ', $args) . ' 2>&1';
        $out = [];
        $resultCode = 0;
        exec($cmd, $out, $resultCode);
        $rawText = trim(implode("\n", $out));
        $raw = json_decode($rawText, true);
        if (is_array($raw) && ($raw['ok'] ?? false)) {
            $skyData = $raw;
        } else {
            $pyError = $raw['error'] ?? ($rawText !== '' ? $rawText : 'Fehler beim Berechnen der Aufgangszeiten.');
        }

        // Planeten
        $args2 = [
            $pythonBin,
            escapeshellarg($scriptPath),
            escapeshellarg('planet_rise_set'),
            escapeshellarg((string)$lat),
            escapeshellarg((string)$lon),
            escapeshellarg((string)$elev),
            escapeshellarg($date),
            escapeshellarg($tz),
        ];
        $cmd2 = implode(' ', $args2) . ' 2>&1';
        $out2 = [];
        $resultCode2 = 0;
        exec($cmd2, $out2, $resultCode2);
        $rawText2 = trim(implode("\n", $out2));
        $raw2 = json_decode($rawText2, true);
        if (is_array($raw2) && ($raw2['ok'] ?? false)) {
            $planetData = $raw2;
        } elseif ($pyError === null) {
            $pyError = $raw2['error'] ?? ($rawText2 !== '' ? $rawText2 : 'Fehler beim Berechnen der Planetenzeiten.');
        }

        // Satelliten-Überflüge heute — Favorit zuerst, dann alle gemerkten
        $stmtSat = $pdo->prepare(
            'SELECT s.id, s.norad_cat_id, s.object_name, s.object_type,
                    s.object_id, s.classification_type,
                    t.epoch, t.mean_motion, t.eccentricity, t.inclination,
                    t.ra_of_asc_node, t.arg_of_pericenter, t.mean_anomaly,
                    t.ephemeris_type, t.element_set_no, t.rev_at_epoch,
                    t.bstar, t.mean_motion_dot, t.mean_motion_ddot,
                    us.is_favorite
             FROM app_user_satellites us
             JOIN sat_satellites s ON s.id = us.satellite_id
             JOIN sat_tle_current t ON t.satellite_id = s.id
             WHERE us.user_id = ?
               AND t.epoch IS NOT NULL
             ORDER BY us.is_favorite DESC, s.object_name ASC
             LIMIT 3'
        );
        $stmtSat->execute([(int)$_SESSION['user_id']]);
        $userSats = $stmtSat->fetchAll();

        if ($userSats) {
            $tzObj    = new DateTimeZone($tz);
            $dayStart = new DateTime('today', $tzObj);
            $dayStart->setTimezone(new DateTimeZone('UTC'));
            $dayEnd = new DateTime('tomorrow', $tzObj);
            $dayEnd->setTimezone(new DateTimeZone('UTC'));
            $satsJson = json_encode(array_map(fn($r) => [
                'id'           => $r['id'],
                'norad_cat_id' => $r['norad_cat_id'],
                'object_name'  => $r['object_name'],
                'tle_line1'    => buildTleLine1($r, $r),
                'tle_line2'    => buildTleLine2($r, $r),
                'is_favorite'  => (bool)$r['is_favorite'],
            ], $userSats), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
            $satsPayload = base64_encode((string) $satsJson);

            $args3 = [
                $pythonBin,
                escapeshellarg($scriptPath),
                escapeshellarg('satellite_passes'),
                escapeshellarg((string)$lat),
                escapeshellarg((string)$lon),
                escapeshellarg((string)$elev),
                escapeshellarg($tz),
                escapeshellarg($dayStart->format('Y-m-d\TH:i:s\Z')),
                escapeshellarg($dayEnd->format('Y-m-d\TH:i:s\Z')),
                escapeshellarg($satsPayload),
            ];
            $cmd3 = implode(' ', $args3) . ' 2>&1';
            $out3 = [];
            $resultCode3 = 0;
            exec($cmd3, $out3, $resultCode3);
            $rawText3 = trim(implode("\n", $out3));
            $raw3 = json_decode($rawText3, true);
            if (is_array($raw3) && ($raw3['ok'] ?? false)) {
                $satData = $raw3;
            } else {
                $satError = $raw3['error'] ?? ($rawText3 !== '' ? $rawText3 : 'Fehler beim Berechnen der Satellitenüberflüge.');
            }
        }
    }
}
?>
<?php require __DIR__ . '/header.php'; ?>

<?php if (!$loggedIn): ?>

    <div class="public-hero">
        <h2>Das Universum erwartet dich</h2>
        <p>Satellitentracking, Himmelsvorschau und Astronomiewerkzeuge für Sonneberg und darüber hinaus.</p>
        <div class="btn-row">
            <a href="login.php" class="btn btn-primary">Anmelden</a>
            <a href="register.php" class="btn btn-secondary">Registrieren</a>
        </div>
    </div>

<?php else: ?>

    <?php if (!$defaultLocation): ?>
        <p class="hint">Noch kein Standort hinterlegt. <a href="settings.php">Jetzt anlegen</a></p>
        <?php elseif ($pyError): ?>
            <ul class="msg-error"><li><?= h($pyError) ?></li></ul>
        <?php else: ?>

        <p class="hint rise-set-location">
            Aufgangs- und Untergangszeiten für
            <strong><?= h($defaultLocation['name']) ?></strong>
            &mdash; <?= h((new DateTimeImmutable('now', new DateTimeZone($tz)))->format('d.m.Y')) ?>
        </p>

        <?php $ev = $skyData['events'] ?? []; ?>
        <div class="card riseset-card">
            <h2>Heute</h2>
            <div class="riseset-grid">
                <span class="riseset-label riseset-main">☀ Sonne</span>
                <span class="riseset-val riseset-main">↑ <?= risesetTime($ev, 'sunrise') ?></span>
                <span class="riseset-val riseset-main">↓ <?= risesetTime($ev, 'sunset') ?></span>

                <span class="riseset-label riseset-dim">Bürgerl.</span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'civil_dawn') ?></span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'civil_dusk') ?></span>

                <span class="riseset-label riseset-dim">Nautisch</span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'nautical_dawn') ?></span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'nautical_dusk') ?></span>

                <span class="riseset-label riseset-dim">Astronom.</span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'astro_dawn') ?></span>
                <span class="riseset-val riseset-dim"><?= risesetTime($ev, 'astro_dusk') ?></span>

                <span class="riseset-sep"></span><span class="riseset-sep"></span><span class="riseset-sep"></span>

                <span class="riseset-label riseset-moon">☽ Mond</span>
                <span class="riseset-val riseset-moon">↑ <?= risesetTime($ev, 'moonrise') ?></span>
                <span class="riseset-val riseset-moon">↓ <?= risesetTime($ev, 'moonset') ?></span>

                <span class="riseset-sep"></span><span class="riseset-sep"></span><span class="riseset-sep"></span>

                <?php foreach (($planetData['planets'] ?? []) as $planet): ?>
                <span class="riseset-label"><?= h($planet['name']) ?></span>
                <span class="riseset-val">↑ <?= ($planet['rise']['found'] ?? false) ? h($planet['rise']['local_time']) : '—' ?></span>
                <span class="riseset-val">↓ <?= ($planet['set']['found']  ?? false) ? h($planet['set']['local_time'])  : '—' ?></span>
                <?php endforeach; ?>
            </div>
        </div>

        <?php if ($satError): ?>
        <div class="card riseset-card">
            <h2>☆ Satellit</h2>
            <p class="hint"><?= h($satError) ?></p>
        </div>
        <?php elseif ($satData): ?>
        <?php
        $favName  = '';
        $favPasses = [];
        foreach (($satData['results'] ?? []) as $sat) {
            if ($sat['is_favorite']) {
                $favName  = $sat['name'];
                $favPasses = $sat['passes'] ?? [];
                break;
            }
        }
        usort($favPasses, fn($a, $b) => strcmp($a['aos_utc'], $b['aos_utc']));
        ?>
        <div class="card riseset-card">
            <h2>☆ <?= h($favName ?: 'Favorit') ?></h2>
            <?php if (empty($favPasses)): ?>
                <p class="hint">Heute keine Überflüge.</p>
            <?php else: ?>
            <div class="riseset-grid sat-passes-grid">
                <span class="riseset-label riseset-dim">AOS</span>
                <span class="riseset-label riseset-dim">LOS</span>
                <span class="riseset-label riseset-dim">Max</span>
                <?php foreach ($favPasses as $p): ?>
                <span class="riseset-val riseset-main"><?= fmtLocalTime($p['aos_utc'], $tz) ?> <small><?= $p['aos_az'] !== null ? azDir((float)$p['aos_az']) : '' ?></small></span>
                <span class="riseset-val"><?= fmtLocalTime($p['los_utc'], $tz) ?> <small><?= $p['los_az'] !== null ? azDir((float)$p['los_az']) : '' ?></small></span>
                <span class="riseset-val riseset-dim"><?= round((float)$p['peak_el']) ?>°</span>
                <?php endforeach; ?>
            </div>
            <?php endif; ?>
        </div>
        <?php endif; ?>

    <?php endif; ?>

<?php endif; ?>

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