<?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;

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;
    } catch (Throwable $e) {
        $defaultLocation = null;
    }
}

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

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

$rangeUnitOptions = [
    'minutes' => 'Minuten',
    'hours' => 'Stunden',
    'days' => 'Tage',
    'weeks' => 'Wochen',
    'months' => 'Monate',
    'years' => 'Jahre',
];

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

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

$selectedRangeUnit = (string) ($_POST['range_unit'] ?? 'days');
if (!isset($rangeUnitOptions[$selectedRangeUnit])) {
    $selectedRangeUnit = 'days';
}

$rangeValueInput = trim((string) ($_POST['range_value'] ?? '7'));
if ($rangeValueInput === '') {
    $rangeValueInput = '7';
}

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 = [];
$exportFormat = (string) ($_POST['export_format'] ?? '');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ($pageLocation === null || $pageLocation['latitude'] === null || $pageLocation['longitude'] === null) {
        $errorMessage = 'Kein gültiger Standard-Standort verfügbar. Bitte zuerst in den Einstellungen einen Standard-Standort setzen.';
    } elseif (!ctype_digit($rangeValueInput) || (int) $rangeValueInput < 1 || (int) $rangeValueInput > 31) {
        $errorMessage = 'Der Zeitraum muss als ganze Zahl zwischen 1 und 31 angegeben werden.';
    } else {
        $pythonResult = runEphemeridenPythonApi('planet_ephemeris', [
            (string) $pageLocation['latitude'],
            (string) $pageLocation['longitude'],
            (string) $pageLocation['elevation'],
            (string) $pageLocation['timezone'],
            $selectedBody,
            $selectedInterval,
            $rangeValueInput,
            $selectedRangeUnit,
        ]);

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

            if ($exportFormat === 'csv' && $ephemerisRows !== []) {
                $filename = 'ephemeriden-' . ephemeriden_slug((string) ($planetOptions[$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;
            }
        }
    }
}

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-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;
}

@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">Planet</label>
                <select id="ephemeridenBody" name="body">
                    <?php foreach ($planetOptions as $bodyValue => $bodyLabel): ?>
                        <option value="<?= ephemeriden_h($bodyValue) ?>"<?= $bodyValue === $selectedBody ? ' selected' : '' ?>><?= ephemeriden_h($bodyLabel) ?></option>
                    <?php endforeach; ?>
                </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="ephemeridenRangeValue">Zeitraum ab heute</label>
                <input
                    type="number"
                    id="ephemeridenRangeValue"
                    name="range_value"
                    min="1"
                    max="31"
                    step="1"
                    value="<?= ephemeriden_h($rangeValueInput) ?>"
                    inputmode="numeric"
                >
            </div>

            <div class="form-group">
                <label for="ephemeridenRangeUnit">Einheit</label>
                <select id="ephemeridenRangeUnit" name="range_unit">
                    <?php foreach ($rangeUnitOptions as $rangeUnitValue => $rangeUnitLabel): ?>
                        <option value="<?= ephemeriden_h($rangeUnitValue) ?>"<?= $rangeUnitValue === $selectedRangeUnit ? ' selected' : '' ?>><?= ephemeriden_h($rangeUnitLabel) ?></option>
                    <?php endforeach; ?>
                </select>
            </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 !== []): ?>
            <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="export_format" value="csv">
                <button type="submit" class="btn btn-secondary">Export CSV</button>
            </form>
        <?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 require __DIR__ . '/footer.php'; ?>