<?php
declare(strict_types=1);

session_start();

$loggedIn = isset($_SESSION['user_id']);
$pageTitle = 'Meteorstroeme - AstroTools';
$bodyClass = 'admin-page meteorshowers-page';
$publicBasePath = './';
$headerIntroPre = 'Beobachtung';
$headerIntroTitle = 'Meteorstroeme';
$headerIntroSub = 'Liste der importierten Meteorstroeme aus der Datenbank mit Angaben in solarer Laenge.';

$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,
    ]
);

$searchQuery = trim((string) ($_GET['q'] ?? ''));
$showMode = trim((string) ($_GET['mode'] ?? 'all'));
$allowedModes = ['all', 'active'];
if (!in_array($showMode, $allowedModes, true)) {
    $showMode = 'all';
}

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

function normalizeSolarLongitude(float $value): float
{
    $normalized = fmod($value, 360.0);
    if ($normalized < 0.0) {
        $normalized += 360.0;
    }

    return $normalized;
}

function currentSolarLongitude(DateTimeImmutable $dateTime): float
{
    $julianDay = ((float) $dateTime->format('U')) / 86400.0 + 2440587.5;
    $daysSinceJ2000 = $julianDay - 2451545.0;
    $meanLongitude = normalizeSolarLongitude(280.46 + 0.9856474 * $daysSinceJ2000);
    $meanAnomalyRad = deg2rad(normalizeSolarLongitude(357.528 + 0.9856003 * $daysSinceJ2000));

    return normalizeSolarLongitude(
        $meanLongitude
        + 1.915 * sin($meanAnomalyRad)
        + 0.020 * sin(2.0 * $meanAnomalyRad)
    );
}

function fetchCurrentSolarLongitude(DateTimeZone $displayTimezone): ?float
{
    $pythonResult = runPythonApi('current_solar_longitude', [$displayTimezone->getName()]);
    if (!$pythonResult['ok']) {
        return null;
    }

    $solarLongitude = $pythonResult['data']['result']['solar_longitude_deg'] ?? null;
    if (!is_numeric($solarLongitude)) {
        return null;
    }

    return normalizeSolarLongitude((float) $solarLongitude);
}

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 isSolarLongitudeInRange(float $current, ?float $start, ?float $finish): bool
{
    if ($start === null || $finish === null) {
        return false;
    }

    $current = normalizeSolarLongitude($current);
    $start = normalizeSolarLongitude($start);
    $finish = normalizeSolarLongitude($finish);

    if ($start <= $finish) {
        return $current >= $start && $current <= $finish;
    }

    return $current >= $start || $current <= $finish;
}

function solarLongitudeToUtcDate(?float $targetLongitude, int $year, DateTimeZone $displayTimezone): ?DateTimeImmutable
{
    if ($targetLongitude === null) {
        return null;
    }

    static $cache = [];

    $cacheKey = $year . '|' . $displayTimezone->getName() . '|' . number_format((float) $targetLongitude, 6, '.', '');
    if (array_key_exists($cacheKey, $cache)) {
        return $cache[$cacheKey];
    }

    $pythonResult = runPythonApi('solar_longitude_to_datetime', [
        (string) $targetLongitude,
        (string) $year,
        $displayTimezone->getName(),
    ]);

    if (!$pythonResult['ok']) {
        $cache[$cacheKey] = null;
        return null;
    }

    $resultData = $pythonResult['data'];
    $utcIso = trim((string) ($resultData['result']['utc_iso'] ?? ''));
    if ($utcIso === '') {
        $cache[$cacheKey] = null;
        return null;
    }

    try {
        $cache[$cacheKey] = new DateTimeImmutable($utcIso);
    } catch (Throwable $e) {
        $cache[$cacheKey] = null;
        return null;
    }

    return $cache[$cacheKey];
}

function warmSolarLongitudeDateCache(array $showers, int $year, DateTimeZone $displayTimezone): void
{
    $uniqueLongitudes = [];

    foreach ($showers as $shower) {
        foreach (['active_start_sol', 'active_finish_sol', 'peak_sol'] as $field) {
            if (!isset($shower[$field]) || $shower[$field] === null || $shower[$field] === '') {
                continue;
            }

            $key = number_format((float) $shower[$field], 6, '.', '');
            $uniqueLongitudes[$key] = (float) $shower[$field];
        }
    }

    foreach ($uniqueLongitudes as $solarLongitude) {
        solarLongitudeToUtcDate($solarLongitude, $year, $displayTimezone);
    }
}

function formatNullableNumber(mixed $value, int $decimals = 1, string $suffix = ''): string
{
    if ($value === null || $value === '') {
        return '-';
    }

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

function formatSolarLongitudeWithDate(?float $solarLongitude, int $year, DateTimeZone $displayTimezone): string
{
    if ($solarLongitude === null) {
        return '-';
    }

    $label = number_format((float) $solarLongitude, 2, ',', '.') . '&deg;';
    $date = solarLongitudeToUtcDate($solarLongitude, $year, $displayTimezone);

    if (!$date instanceof DateTimeImmutable) {
        return $label;
    }

    return $label . '<br><span class="hint">' . htmlspecialchars($date->setTimezone($displayTimezone)->format('d.m.Y'), ENT_QUOTES, 'UTF-8') . '</span>';
}

$displayTimezone = new DateTimeZone(date_default_timezone_get() ?: 'Europe/Berlin');
$displayYear = (int) (new DateTimeImmutable('now', $displayTimezone))->format('Y');
$todaySolarLongitude = fetchCurrentSolarLongitude($displayTimezone)
    ?? currentSolarLongitude(new DateTimeImmutable('now', new DateTimeZone('UTC')));

$sql = "
    SELECT
        `id`,
        `shower_code`,
        `iau_no`,
        `designation`,
        `speed_kms`,
        `radiant_alpha_deg`,
        `radiant_delta_deg`,
        `parent_object`,
        `population_index`,
        `active_start_sol`,
        `active_finish_sol`,
        `peak_sol`,
        `zhr`,
        `zhr_variable`,
        `has_yearly_variants`
    FROM `meteorshowers`
    WHERE 1 = 1
";

$params = [];

if ($searchQuery !== '') {
    $sql .= "
        AND (
            `shower_code` LIKE :query
            OR `designation` LIKE :query
            OR `parent_object` LIKE :query
        )
    ";
    $params[':query'] = '%' . $searchQuery . '%';
}

$sql .= "
    ORDER BY
        COALESCE(`zhr`, 0) DESC,
        `peak_sol` IS NULL ASC,
        `peak_sol` ASC,
        `designation` ASC
";

$stmt = $pdo->prepare($sql);
$stmt->execute($params);
$allShowers = $stmt->fetchAll();

$showers = [];
$activeCount = 0;

foreach ($allShowers as $shower) {
    $isActive = isSolarLongitudeInRange(
        $todaySolarLongitude,
        isset($shower['active_start_sol']) ? (float) $shower['active_start_sol'] : null,
        isset($shower['active_finish_sol']) ? (float) $shower['active_finish_sol'] : null
    );

    if ($isActive) {
        $activeCount++;
    }

    $shower['is_active_now'] = $isActive;

    if ($showMode === 'active' && !$isActive) {
        continue;
    }

    $showers[] = $shower;
}

warmSolarLongitudeDateCache($showers, $displayYear, $displayTimezone);

$topZhr = null;
foreach ($allShowers as $shower) {
    if ($shower['zhr'] !== null) {
        $topZhr = (int) $shower['zhr'];
        break;
    }
}

require __DIR__ . '/header.php';
?>

<?php
$statsCards = [
    ['label' => 'Importierte Meteorstroeme', 'value' => (string) count($allShowers)],
    ['label' => 'Davon aktuell aktiv', 'value' => (string) $activeCount],
    ['label' => 'Hoechste ZHR', 'value' => $topZhr !== null ? (string) $topZhr : '-'],
    ['label' => 'Aktuelle solare Laenge', 'value' => number_format($todaySolarLongitude, 2, ',', '.') . '°'],
    ['label' => 'Datumsumrechnung', 'value' => (string) $displayYear],
];
?>

<section class="card">
    <div class="stats-grid">
        <?php foreach ($statsCards as $card): ?>
            <div class="stats-card">
                <div class="stats-label"><?= h($card['label']) ?></div>
                <div class="stats-value"><?= h($card['value']) ?></div>
            </div>
        <?php endforeach; ?>
    </div>
</section>

<section class="card">
    <form method="get" action="" class="form-stack">
        <div class="grid-2 gap-sm">
            <div class="form-group">
                <label for="q">Suche</label>
                <input
                    type="text"
                    id="q"
                    name="q"
                    value="<?= h($searchQuery) ?>"
                    placeholder="Code, Bezeichnung oder Mutterkoerper"
                >
            </div>
            <div class="form-group">
                <label for="mode">Anzeige</label>
                <select id="mode" name="mode">
                    <option value="all" <?= $showMode === 'all' ? 'selected' : '' ?>>Alle Meteorstroeme</option>
                    <option value="active" <?= $showMode === 'active' ? 'selected' : '' ?>>Nur aktuell aktive</option>
                </select>
            </div>
        </div>
        <div class="input-row">
            <button type="submit" class="btn btn-primary">Anzeigen</button>
            <a href="meteorshowers.php" class="btn btn-secondary">Zuruecksetzen</a>
        </div>
    </form>
</section>

<section class="card">
    <h2>Liste der Meteorstroeme</h2>
    <p class="hint">Die Gradangaben in Aktivitaet und Maximum sind Werte der solaren Laenge. Zusaetzlich wird dafuer ein Kalenderdatum im Jahr <?= h((string) $displayYear) ?> angezeigt.</p>
    <?php if ($showers === []): ?>
        <p class="hint">Keine Meteorstroeme fuer diese Auswahl gefunden.</p>
    <?php else: ?>
        <div class="table-wrap">
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Status</th>
                        <th>Code</th>
                        <th>IAU</th>
                        <th>Bezeichnung</th>
                        <th>ZHR</th>
                        <th>Aktivitaet (solare Laenge)</th>
                        <th>Maximum (solare Laenge)</th>
                        <th>Radiant</th>
                        <th>v<sub>g</sub></th>
                        <th>Mutterkoerper</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($showers as $shower): ?>
                        <tr>
                            <td>
                                <?php if ($shower['is_active_now']): ?>
                                    <span class="pill pill-success">Aktiv</span>
                                <?php else: ?>
                                    <span class="pill pill-muted">Inaktiv</span>
                                <?php endif; ?>
                            </td>
                            <td><strong><?= h((string) $shower['shower_code']) ?></strong></td>
                            <td><?= h($shower['iau_no'] !== null ? (string) $shower['iau_no'] : '-') ?></td>
                            <td>
                                <?= h((string) $shower['designation']) ?>
                                <?php if ((int) ($shower['has_yearly_variants'] ?? 0) === 1): ?>
                                    <br><span class="hint">mit Jahresvarianten</span>
                                <?php endif; ?>
                            </td>
                            <td>
                                <?=
                                    h(
                                        $shower['zhr_variable'] !== null && trim((string) $shower['zhr_variable']) !== ''
                                            ? (string) $shower['zhr_variable']
                                            : ($shower['zhr'] !== null ? (string) $shower['zhr'] : '-')
                                    )
                                ?>
                            </td>
                            <td>
                                <?= formatSolarLongitudeWithDate(isset($shower['active_start_sol']) ? (float) $shower['active_start_sol'] : null, $displayYear, $displayTimezone) ?>
                                bis
                                <?= formatSolarLongitudeWithDate(isset($shower['active_finish_sol']) ? (float) $shower['active_finish_sol'] : null, $displayYear, $displayTimezone) ?>
                            </td>
                            <td><?= formatSolarLongitudeWithDate(isset($shower['peak_sol']) ? (float) $shower['peak_sol'] : null, $displayYear, $displayTimezone) ?></td>
                            <td>
                                RA <?= h(formatNullableNumber($shower['radiant_alpha_deg'], 1, '°')) ?><br>
                                Dec <?= h(formatNullableNumber($shower['radiant_delta_deg'], 1, '°')) ?>
                            </td>
                            <td><?= h(formatNullableNumber($shower['speed_kms'], 1, ' km/s')) ?></td>
                            <td><?= h($shower['parent_object'] !== null && trim((string) $shower['parent_object']) !== '' ? (string) $shower['parent_object'] : '-') ?></td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    <?php endif; ?>
</section>

<style>
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.stats-card {
    padding: 1rem 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.04);
}

.stats-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.stats-value {
    margin-top: 0.35rem;
    font-size: 1.5rem;
    font-weight: 700;
}

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

.pill {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.pill-success {
    color: #123b1d;
    background: #7fe09a;
}

.pill-muted {
    color: #dce4f5;
    background: rgba(220, 228, 245, 0.16);
}
</style>

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