<?php
declare(strict_types=1);

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

if (!isset($_SESSION['user_id'])) {
    header('Location: login.php');
    exit;
}

$config = require __DIR__ . '/../config/database.php';

$dsn = sprintf(
    'mysql:host=%s;dbname=%s;charset=%s',
    $config['host'],
    $config['dbname'],
    $config['charset'] ?? 'utf8mb4'
);

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

$userId = (int) $_SESSION['user_id'];
$errors = [];
$successMessage = '';
$satelliteSearchResults = [];
$minorplanetSearchResults = [];
$satelliteSearchQuery = trim($_GET['sat_q'] ?? '');
$minorplanetSearchQuery = trim($_GET['mp_q'] ?? '');
$pageTitle = 'Favoriten - AstroTools';
$headerIntroPre = 'Merkliste';
$headerIntroTitle = 'Favoriten';
$headerIntroSub = 'Satelliten und Kleinplaneten zentral verwalten.';

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

function validTimezone(string $timezone): bool
{
    return in_array($timezone, timezone_identifiers_list(), true);
}

function setExclusiveFavorite(PDO $pdo, string $tableName, string $idColumn, int $userId, int $entityId): bool
{
    $pdo->beginTransaction();

    try {
        $stmtCurrent = $pdo->prepare("
            SELECT `is_favorite`
            FROM `{$tableName}`
            WHERE `user_id` = :user_id
              AND `{$idColumn}` = :entity_id
            LIMIT 1
        ");
        $stmtCurrent->execute([
            ':user_id' => $userId,
            ':entity_id' => $entityId,
        ]);
        $current = $stmtCurrent->fetchColumn();

        if ($current === false) {
            $pdo->rollBack();
            return false;
        }

        $newValue = (int) $current === 1 ? 0 : 1;

        if ($newValue === 1) {
            $stmtReset = $pdo->prepare("
                UPDATE `{$tableName}`
                SET `is_favorite` = 0
                WHERE `user_id` = :user_id
            ");
            $stmtReset->execute([
                ':user_id' => $userId,
            ]);
        }

        $stmtSet = $pdo->prepare("
            UPDATE `{$tableName}`
            SET `is_favorite` = :is_favorite
            WHERE `user_id` = :user_id
              AND `{$idColumn}` = :entity_id
        ");
        $stmtSet->execute([
            ':is_favorite' => $newValue,
            ':user_id' => $userId,
            ':entity_id' => $entityId,
        ]);

        $pdo->commit();
        return true;
    } catch (Throwable $e) {
        if ($pdo->inTransaction()) {
            $pdo->rollBack();
        }
        throw $e;
    }
}

function countUserRows(PDO $pdo, string $tableName, int $userId): int
{
    $stmtCount = $pdo->prepare("
        SELECT COUNT(*)
        FROM `{$tableName}`
        WHERE `user_id` = :user_id
    ");
    $stmtCount->execute([
        ':user_id' => $userId,
    ]);

    return (int) $stmtCount->fetchColumn();
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';

    if ($action === 'add_satellite') {
        $satelliteId = (int) ($_POST['satellite_id'] ?? 0);

        if ($satelliteId <= 0) {
            $errors[] = 'Ungültiger Satellit.';
        }

        if (empty($errors)) {
            $stmtCheck = $pdo->prepare("
                SELECT `id`
                FROM `sat_satellites`
                WHERE `id` = :id
                LIMIT 1
            ");
            $stmtCheck->execute([
                ':id' => $satelliteId,
            ]);

            if (!$stmtCheck->fetch()) {
                $errors[] = 'Der Satellit wurde nicht gefunden.';
            }
        }

        if (empty($errors)) {
            $stmtInsert = $pdo->prepare("
                INSERT INTO `app_user_satellites` (
                    `user_id`,
                    `satellite_id`,
                    `is_favorite`,
                    `created_at`
                ) VALUES (
                    :user_id,
                    :satellite_id,
                    0,
                    NOW()
                )
                ON DUPLICATE KEY UPDATE
                    `satellite_id` = VALUES(`satellite_id`)
            ");
            $stmtInsert->execute([
                ':user_id' => $userId,
                ':satellite_id' => $satelliteId,
            ]);

            $successMessage = 'Der Satellit wurde hinzugefuegt.';
        }
    }

    if ($action === 'remove_satellite') {
        $satelliteId = (int) ($_POST['satellite_id'] ?? 0);

        if ($satelliteId <= 0) {
            $errors[] = 'Ungültiger Satellit.';
        }

        if (empty($errors)) {
            $stmtSatellite = $pdo->prepare("
                SELECT `satellite_id`, `is_favorite`
                FROM `app_user_satellites`
                WHERE `user_id` = :user_id
                  AND `satellite_id` = :satellite_id
                LIMIT 1
            ");
            $stmtSatellite->execute([
                ':user_id' => $userId,
                ':satellite_id' => $satelliteId,
            ]);
            $satelliteRow = $stmtSatellite->fetch();

            if (!$satelliteRow) {
                $errors[] = 'Der Satellit ist nicht in deiner Liste vorhanden.';
            }
        }

        if (empty($errors)) {
            $satelliteCount = countUserRows($pdo, 'app_user_satellites', $userId);
            if ($satelliteCount <= 1) {
                $errors[] = 'Der letzte Satellit kann nicht gelöscht werden.';
            }
        }

        if (empty($errors)) {
            $pdo->beginTransaction();

            try {
                $stmtDelete = $pdo->prepare("
                    DELETE FROM `app_user_satellites`
                    WHERE `user_id` = :user_id
                      AND `satellite_id` = :satellite_id
                ");
                $stmtDelete->execute([
                    ':user_id' => $userId,
                    ':satellite_id' => $satelliteId,
                ]);

                if ((int) ($satelliteRow['is_favorite'] ?? 0) === 1) {
                    $stmtNextFavorite = $pdo->prepare("
                        SELECT `satellite_id`
                        FROM `app_user_satellites`
                        WHERE `user_id` = :user_id
                        ORDER BY `created_at` ASC, `satellite_id` ASC
                        LIMIT 1
                    ");
                    $stmtNextFavorite->execute([
                        ':user_id' => $userId,
                    ]);
                    $nextSatelliteId = $stmtNextFavorite->fetchColumn();

                    if ($nextSatelliteId !== false) {
                        $stmtResetFavorites = $pdo->prepare("
                            UPDATE `app_user_satellites`
                            SET `is_favorite` = 0
                            WHERE `user_id` = :user_id
                        ");
                        $stmtResetFavorites->execute([
                            ':user_id' => $userId,
                        ]);

                        $stmtSetFavorite = $pdo->prepare("
                            UPDATE `app_user_satellites`
                            SET `is_favorite` = 1
                            WHERE `user_id` = :user_id
                              AND `satellite_id` = :satellite_id
                        ");
                        $stmtSetFavorite->execute([
                            ':user_id' => $userId,
                            ':satellite_id' => (int) $nextSatelliteId,
                        ]);
                    }
                }

                $pdo->commit();
                $successMessage = 'Der Satellit wurde entfernt.';
            } catch (Throwable $e) {
                if ($pdo->inTransaction()) {
                    $pdo->rollBack();
                }
                $errors[] = 'Der Satellit konnte nicht entfernt werden.';
            }
        }
    }

    if ($action === 'toggle_satellite_favorite') {
        $satelliteId = (int) ($_POST['satellite_id'] ?? 0);

        if ($satelliteId <= 0) {
            $errors[] = 'Ungültiger Satellit.';
        }

        if (empty($errors)) {
            $stmtCurrentSatellite = $pdo->prepare("
                SELECT `is_favorite`
                FROM `app_user_satellites`
                WHERE `user_id` = :user_id
                  AND `satellite_id` = :satellite_id
                LIMIT 1
            ");
            $stmtCurrentSatellite->execute([
                ':user_id' => $userId,
                ':satellite_id' => $satelliteId,
            ]);
            $currentSatelliteFavorite = $stmtCurrentSatellite->fetchColumn();

            if ($currentSatelliteFavorite === false) {
                $errors[] = 'Der Satellit ist nicht in deiner Liste vorhanden.';
            }
        }

        if (empty($errors)) {
            $satelliteCount = countUserRows($pdo, 'app_user_satellites', $userId);
            if ($satelliteCount <= 1 && (int) $currentSatelliteFavorite === 1) {
                $errors[] = 'Beim letzten Satelliten kann der Favorit nicht entfernt werden.';
            }
        }

        if (empty($errors)) {
            if (!setExclusiveFavorite($pdo, 'app_user_satellites', 'satellite_id', $userId, $satelliteId)) {
                $errors[] = 'Der Satellit ist nicht in deiner Liste vorhanden.';
            } else {
                $successMessage = 'Der Satelliten-Favorit wurde aktualisiert.';
            }
        }
    }

    if ($action === 'add_minorplanet') {
        $minorplanetId = (int) ($_POST['minorplanet_id'] ?? 0);

        if ($minorplanetId <= 0) {
            $errors[] = 'Ungültiger Kleinplanet.';
        }

        if (empty($errors)) {
            $stmtCheck = $pdo->prepare("
                SELECT `id`
                FROM `minorplanets_mpc`
                WHERE `id` = :id
                LIMIT 1
            ");
            $stmtCheck->execute([
                ':id' => $minorplanetId,
            ]);

            if (!$stmtCheck->fetch()) {
                $errors[] = 'Der Kleinplanet wurde nicht gefunden.';
            }
        }

        if (empty($errors)) {
            $stmtInsert = $pdo->prepare("
                INSERT INTO `app_user_minorplanets` (
                    `user_id`,
                    `minorplanet_id`,
                    `is_favorite`,
                    `created_at`
                ) VALUES (
                    :user_id,
                    :minorplanet_id,
                    0,
                    NOW()
                )
                ON DUPLICATE KEY UPDATE
                    `minorplanet_id` = VALUES(`minorplanet_id`)
            ");
            $stmtInsert->execute([
                ':user_id' => $userId,
                ':minorplanet_id' => $minorplanetId,
            ]);

            $successMessage = 'Der Kleinplanet wurde hinzugefuegt.';
        }
    }

    if ($action === 'remove_minorplanet') {
        $minorplanetId = (int) ($_POST['minorplanet_id'] ?? 0);

        if ($minorplanetId <= 0) {
            $errors[] = 'Ungültiger Kleinplanet.';
        }

        if (empty($errors)) {
            $stmtDelete = $pdo->prepare("
                DELETE FROM `app_user_minorplanets`
                WHERE `user_id` = :user_id
                  AND `minorplanet_id` = :minorplanet_id
            ");
            $stmtDelete->execute([
                ':user_id' => $userId,
                ':minorplanet_id' => $minorplanetId,
            ]);

            $successMessage = 'Der Kleinplanet wurde entfernt.';
        }
    }

    if ($action === 'toggle_minorplanet_favorite') {
        $minorplanetId = (int) ($_POST['minorplanet_id'] ?? 0);

        if ($minorplanetId <= 0) {
            $errors[] = 'Ungültiger Kleinplanet.';
        }

        if (empty($errors)) {
            if (!setExclusiveFavorite($pdo, 'app_user_minorplanets', 'minorplanet_id', $userId, $minorplanetId)) {
                $errors[] = 'Der Kleinplanet ist nicht in deiner Liste vorhanden.';
            } else {
                $successMessage = 'Der Kleinplaneten-Favorit wurde aktualisiert.';
            }
        }
    }

    if ($action === 'add_location') {
        $name = trim($_POST['name'] ?? '');
        $latitude = trim($_POST['latitude'] ?? '');
        $longitude = trim($_POST['longitude'] ?? '');
        $elevation = trim($_POST['elevation'] ?? '');
        $timezone = trim($_POST['timezone'] ?? 'Europe/Berlin');
        $isDefault = isset($_POST['is_default']) ? 1 : 0;

        if ($name === '') {
            $errors[] = 'Bitte einen Namen für den Standort eingeben.';
        }

        if ($latitude === '' || !is_numeric($latitude)) {
            $errors[] = 'Bitte einen gültigen Breitengrad eingeben.';
        } else {
            $lat = (float) $latitude;
            if ($lat < -90 || $lat > 90) {
                $errors[] = 'Der Breitengrad muss zwischen -90 und 90 liegen.';
            }
        }

        if ($longitude === '' || !is_numeric($longitude)) {
            $errors[] = 'Bitte einen gültigen Längengrad eingeben.';
        } else {
            $lon = (float) $longitude;
            if ($lon < -180 || $lon > 180) {
                $errors[] = 'Der Längengrad muss zwischen -180 und 180 liegen.';
            }
        }

        if ($elevation !== '' && !is_numeric($elevation)) {
            $errors[] = 'Die Hoehe muss numerisch sein.';
        }

        if (!validTimezone($timezone)) {
            $errors[] = 'Bitte eine gültige IANA-Zeitzone angeben, z. B. Europe/Berlin.';
        }

        if (empty($errors)) {
            $pdo->beginTransaction();

            try {
                if ($isDefault === 1) {
                    $stmtReset = $pdo->prepare("
                        UPDATE `app_user_locations`
                        SET `is_default` = 0
                        WHERE `user_id` = :user_id
                    ");
                    $stmtReset->execute([
                        ':user_id' => $userId,
                    ]);
                }

                $stmtInsertLocation = $pdo->prepare("
                    INSERT INTO `app_user_locations` (
                        `user_id`,
                        `name`,
                        `latitude`,
                        `longitude`,
                        `elevation`,
                        `timezone`,
                        `is_default`,
                        `created_at`,
                        `updated_at`
                    ) VALUES (
                        :user_id,
                        :name,
                        :latitude,
                        :longitude,
                        :elevation,
                        :timezone,
                        :is_default,
                        NOW(),
                        NOW()
                    )
                ");
                $stmtInsertLocation->execute([
                    ':user_id' => $userId,
                    ':name' => $name,
                    ':latitude' => (float) $latitude,
                    ':longitude' => (float) $longitude,
                    ':elevation' => $elevation !== '' ? (float) $elevation : null,
                    ':timezone' => $timezone,
                    ':is_default' => $isDefault,
                ]);

                $pdo->commit();
                $successMessage = 'Der Standort wurde gespeichert.';
                $_POST = [];
            } catch (Throwable $e) {
                if ($pdo->inTransaction()) {
                    $pdo->rollBack();
                }
                $errors[] = 'Der Standort konnte nicht gespeichert werden.';
            }
        }
    }

    if ($action === 'set_default_location') {
        $locationId = (int) ($_POST['location_id'] ?? 0);

        if ($locationId <= 0) {
            $errors[] = 'Ungültiger Standort.';
        }

        if (empty($errors)) {
            $stmtCheckLocation = $pdo->prepare("
                SELECT `id`
                FROM `app_user_locations`
                WHERE `id` = :id
                  AND `user_id` = :user_id
                LIMIT 1
            ");
            $stmtCheckLocation->execute([
                ':id' => $locationId,
                ':user_id' => $userId,
            ]);

            if (!$stmtCheckLocation->fetch()) {
                $errors[] = 'Der Standort wurde nicht gefunden.';
            }
        }

        if (empty($errors)) {
            $pdo->beginTransaction();

            try {
                $stmtReset = $pdo->prepare("
                    UPDATE `app_user_locations`
                    SET `is_default` = 0
                    WHERE `user_id` = :user_id
                ");
                $stmtReset->execute([
                    ':user_id' => $userId,
                ]);

                $stmtSet = $pdo->prepare("
                    UPDATE `app_user_locations`
                    SET `is_default` = 1
                    WHERE `id` = :id
                      AND `user_id` = :user_id
                ");
                $stmtSet->execute([
                    ':id' => $locationId,
                    ':user_id' => $userId,
                ]);

                $pdo->commit();
                $successMessage = 'Der Standard-Standort wurde gesetzt.';
            } catch (Throwable $e) {
                if ($pdo->inTransaction()) {
                    $pdo->rollBack();
                }
                $errors[] = 'Der Standard-Standort konnte nicht gesetzt werden.';
            }
        }
    }

    if ($action === 'delete_location') {
        $locationId = (int) ($_POST['location_id'] ?? 0);

        if ($locationId <= 0) {
            $errors[] = 'Ungültiger Standort.';
        }

        if (empty($errors)) {
            $stmtLocation = $pdo->prepare("
                SELECT `id`, `is_default`
                FROM `app_user_locations`
                WHERE `id` = :id
                  AND `user_id` = :user_id
                LIMIT 1
            ");
            $stmtLocation->execute([
                ':id' => $locationId,
                ':user_id' => $userId,
            ]);
            $locationRow = $stmtLocation->fetch();

            if (!$locationRow) {
                $errors[] = 'Der Standort wurde nicht gefunden.';
            }
        }

        if (empty($errors)) {
            $locationCount = countUserRows($pdo, 'app_user_locations', $userId);
            if ($locationCount <= 1) {
                $errors[] = 'Der letzte Standort kann nicht gelöscht werden.';
            }
        }

        if (empty($errors)) {
            $pdo->beginTransaction();

            try {
                $stmtDelete = $pdo->prepare("
                    DELETE FROM `app_user_locations`
                    WHERE `id` = :id
                      AND `user_id` = :user_id
                ");
                $stmtDelete->execute([
                    ':id' => $locationId,
                    ':user_id' => $userId,
                ]);

                if ((int) ($locationRow['is_default'] ?? 0) === 1) {
                    $stmtNextDefault = $pdo->prepare("
                        SELECT `id`
                        FROM `app_user_locations`
                        WHERE `user_id` = :user_id
                        ORDER BY `name` ASC, `id` ASC
                        LIMIT 1
                    ");
                    $stmtNextDefault->execute([
                        ':user_id' => $userId,
                    ]);
                    $nextLocationId = $stmtNextDefault->fetchColumn();

                    if ($nextLocationId !== false) {
                        $stmtResetDefaults = $pdo->prepare("
                            UPDATE `app_user_locations`
                            SET `is_default` = 0
                            WHERE `user_id` = :user_id
                        ");
                        $stmtResetDefaults->execute([
                            ':user_id' => $userId,
                        ]);

                        $stmtSetDefault = $pdo->prepare("
                            UPDATE `app_user_locations`
                            SET `is_default` = 1
                            WHERE `user_id` = :user_id
                              AND `id` = :id
                        ");
                        $stmtSetDefault->execute([
                            ':user_id' => $userId,
                            ':id' => (int) $nextLocationId,
                        ]);
                    }
                }

                $pdo->commit();
                $successMessage = 'Der Standort wurde gelöscht.';
            } catch (Throwable $e) {
                if ($pdo->inTransaction()) {
                    $pdo->rollBack();
                }
                $errors[] = 'Der Standort konnte nicht gelöscht werden.';
            }
        }
    }
}

$stmtLocations = $pdo->prepare("
    SELECT
        `id`,
        `name`,
        `latitude`,
        `longitude`,
        `elevation`,
        `timezone`,
        `is_default`
    FROM `app_user_locations`
    WHERE `user_id` = :user_id
    ORDER BY `is_default` DESC, `name` ASC
");
$stmtLocations->execute([
    ':user_id' => $userId,
]);
$locations = $stmtLocations->fetchAll();

$defaultLocation = null;
foreach ($locations as $location) {
    if ((int) $location['is_default'] === 1) {
        $defaultLocation = $location;
        break;
    }
}

$mapLat = isset($_POST['latitude']) && is_numeric($_POST['latitude'])
    ? (float) $_POST['latitude']
    : ($defaultLocation ? (float) $defaultLocation['latitude'] : 51.1657);
$mapLon = isset($_POST['longitude']) && is_numeric($_POST['longitude'])
    ? (float) $_POST['longitude']
    : ($defaultLocation ? (float) $defaultLocation['longitude'] : 10.4515);
$mapZoom = $defaultLocation ? 10 : 6;

if ($satelliteSearchQuery !== '') {
    if (ctype_digit($satelliteSearchQuery)) {
        $stmtSatelliteSearch = $pdo->prepare("
            SELECT
                s.`id`,
                s.`norad_cat_id`,
                s.`object_name`,
                CASE
                    WHEN aus.`satellite_id` IS NULL THEN 0
                    ELSE 1
                END AS `already_added`
            FROM `sat_satellites` s
            LEFT JOIN `app_user_satellites` aus
                ON aus.`satellite_id` = s.`id`
               AND aus.`user_id` = :user_id
            WHERE s.`norad_cat_id` = :norad_cat_id
            ORDER BY s.`object_name` ASC
            LIMIT 50
        ");
        $stmtSatelliteSearch->execute([
            ':user_id' => $userId,
            ':norad_cat_id' => (int) $satelliteSearchQuery,
        ]);
    } else {
        $stmtSatelliteSearch = $pdo->prepare("
            SELECT
                s.`id`,
                s.`norad_cat_id`,
                s.`object_name`,
                CASE
                    WHEN aus.`satellite_id` IS NULL THEN 0
                    ELSE 1
                END AS `already_added`
            FROM `sat_satellites` s
            LEFT JOIN `app_user_satellites` aus
                ON aus.`satellite_id` = s.`id`
               AND aus.`user_id` = :user_id
            WHERE s.`object_name` LIKE :query
            ORDER BY s.`object_name` ASC
            LIMIT 50
        ");
        $stmtSatelliteSearch->execute([
            ':user_id' => $userId,
            ':query' => '%' . $satelliteSearchQuery . '%',
        ]);
    }

    $satelliteSearchResults = $stmtSatelliteSearch->fetchAll();
}

if ($minorplanetSearchQuery !== '') {
    if (ctype_digit($minorplanetSearchQuery)) {
        $stmtMinorplanetSearch = $pdo->prepare("
            SELECT
                mp.`id`,
                mp.`mp_number`,
                mp.`designation_text`,
                mp.`desig_packed`,
                CASE
                    WHEN aum.`minorplanet_id` IS NULL THEN 0
                    ELSE 1
                END AS `already_added`
            FROM `minorplanets_mpc` mp
            LEFT JOIN `app_user_minorplanets` aum
                ON aum.`minorplanet_id` = mp.`id`
               AND aum.`user_id` = :user_id
            WHERE mp.`mp_number` = :mp_number
            ORDER BY mp.`mp_number` ASC, mp.`designation_text` ASC
            LIMIT 50
        ");
        $stmtMinorplanetSearch->execute([
            ':user_id' => $userId,
            ':mp_number' => (int) $minorplanetSearchQuery,
        ]);
    } else {
        $stmtMinorplanetSearch = $pdo->prepare("
            SELECT
                mp.`id`,
                mp.`mp_number`,
                mp.`designation_text`,
                mp.`desig_packed`,
                CASE
                    WHEN aum.`minorplanet_id` IS NULL THEN 0
                    ELSE 1
                END AS `already_added`
            FROM `minorplanets_mpc` mp
            LEFT JOIN `app_user_minorplanets` aum
                ON aum.`minorplanet_id` = mp.`id`
               AND aum.`user_id` = :user_id
            WHERE mp.`designation_text` LIKE :query
               OR mp.`desig_packed` LIKE :query
            ORDER BY mp.`mp_number` IS NULL ASC, mp.`mp_number` ASC, mp.`designation_text` ASC
            LIMIT 50
        ");
        $stmtMinorplanetSearch->execute([
            ':user_id' => $userId,
            ':query' => '%' . $minorplanetSearchQuery . '%',
        ]);
    }

    $minorplanetSearchResults = $stmtMinorplanetSearch->fetchAll();
}

$stmtTrackedSatellites = $pdo->prepare("
    SELECT
        s.`id`,
        s.`norad_cat_id`,
        s.`object_name`,
        aus.`is_favorite`,
        aus.`created_at`
    FROM `app_user_satellites` aus
    INNER JOIN `sat_satellites` s
        ON s.`id` = aus.`satellite_id`
    WHERE aus.`user_id` = :user_id
    ORDER BY aus.`is_favorite` DESC, s.`object_name` ASC
");
$stmtTrackedSatellites->execute([
    ':user_id' => $userId,
]);
$trackedSatellites = $stmtTrackedSatellites->fetchAll();

$stmtTrackedMinorplanets = $pdo->prepare("
    SELECT
        mp.`id`,
        mp.`mp_number`,
        mp.`designation_text`,
        mp.`desig_packed`,
        aum.`is_favorite`,
        aum.`created_at`
    FROM `app_user_minorplanets` aum
    INNER JOIN `minorplanets_mpc` mp
        ON mp.`id` = aum.`minorplanet_id`
    WHERE aum.`user_id` = :user_id
    ORDER BY aum.`is_favorite` DESC, mp.`mp_number` IS NULL ASC, mp.`mp_number` ASC, mp.`designation_text` ASC
");
$stmtTrackedMinorplanets->execute([
    ':user_id' => $userId,
]);
$trackedMinorplanets = $stmtTrackedMinorplanets->fetchAll();

$loggedIn = true;
?>
<?php require __DIR__ . '/header.php'; ?>

<link
    rel="stylesheet"
    href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
    integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY="
    crossorigin=""
>

<?php if ($successMessage !== ''): ?>
    <p class="msg-success"><?= h($successMessage) ?></p>
<?php endif; ?>

<?php if (!empty($errors)): ?>
    <ul class="msg-error">
        <?php foreach ($errors as $error): ?>
            <li><?= h($error) ?></li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>

<div class="grid-2">
    <div class="card">
        <h2>Standorte</h2>
        <?php if (empty($locations)): ?>
            <p class="hint">Es sind noch keine Standorte gespeichert.</p>
        <?php else: ?>
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>Breitengrad</th>
                        <th>Längengrad</th>
                        <th>Hoehe</th>
                        <th>Zeitzone</th>
                        <th>Standard</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($locations as $location): ?>
                        <tr>
                            <td><?= h($location['name']) ?></td>
                            <td><?= h((string) $location['latitude']) ?></td>
                            <td><?= h((string) $location['longitude']) ?></td>
                            <td><?= h($location['elevation'] !== null ? (string) $location['elevation'] . ' m' : '-') ?></td>
                            <td><?= h($location['timezone']) ?></td>
                            <td><?= (int) $location['is_default'] === 1 ? '*' : '-' ?></td>
                            <td class="action-cell">
                                <?php if ((int) $location['is_default'] !== 1): ?>
                                    <form method="post" action="" class="favorites-loading-form" data-loading-message="Standard-Standort wird gesetzt...">
                                        <input type="hidden" name="action" value="set_default_location">
                                        <input type="hidden" name="location_id" value="<?= (int) $location['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-secondary">Als Standard</button>
                                    </form>
                                <?php endif; ?>
                                <?php if (count($locations) > 1): ?>
                                    <form method="post" action="" class="favorites-loading-form" data-loading-message="Standort wird entfernt..." onsubmit="return confirm('Standort wirklich löschen?');">
                                        <input type="hidden" name="action" value="delete_location">
                                        <input type="hidden" name="location_id" value="<?= (int) $location['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-danger">Loeschen</button>
                                    </form>
                                <?php else: ?>
                                    <span class="hint">Letzter Standort</span>
                                <?php endif; ?>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        <?php endif; ?>
    </div>

    <div class="card">
        <h2>Standort hinzufuegen</h2>
        <p class="hint mb-md">Suche einen Ort, nutze den Browser-Standort oder klicke direkt in die Karte.</p>

        <div class="input-row mb-sm">
            <input type="text" id="place-search" placeholder="Ort oder Adresse, z. B. Berlin, Wien">
            <button type="button" id="search-place" class="btn btn-primary">Suchen</button>
            <button type="button" id="lookup-elevation" class="btn btn-secondary">Hoehe ermitteln</button>
            <button type="button" id="detect-location" class="btn btn-secondary">Browser-Standort</button>
        </div>

        <div id="map" class="map"></div>

        <form method="post" action="" class="form-stack mt-xl favorites-loading-form" data-loading-message="Standort wird gespeichert...">
            <input type="hidden" name="action" value="add_location">
            <div class="grid-2 gap-sm">
                <div class="form-group">
                    <label for="name">Name</label>
                    <input type="text" id="name" name="name" required value="<?= h($_POST['name'] ?? '') ?>">
                </div>
                <div class="form-group">
                    <label for="timezone">Zeitzone (IANA)</label>
                    <input type="text" id="timezone" name="timezone" required value="<?= h($_POST['timezone'] ?? ($defaultLocation['timezone'] ?? 'Europe/Berlin')) ?>">
                </div>
                <div class="form-group">
                    <label for="latitude">Breitengrad</label>
                    <input type="text" id="latitude" name="latitude" required value="<?= h($_POST['latitude'] ?? ($defaultLocation['latitude'] ?? '')) ?>">
                </div>
                <div class="form-group">
                    <label for="longitude">Längengrad</label>
                    <input type="text" id="longitude" name="longitude" required value="<?= h($_POST['longitude'] ?? ($defaultLocation['longitude'] ?? '')) ?>">
                </div>
                <div class="form-group">
                    <label for="elevation">Hoehe (optional, Meter)</label>
                    <input type="text" id="elevation" name="elevation" value="<?= h($_POST['elevation'] ?? '') ?>">
                </div>
            </div>
            <label class="form-checkbox">
                <input type="checkbox" name="is_default" value="1" <?= isset($_POST['is_default']) ? 'checked' : '' ?>>
                Als Standard-Standort speichern
            </label>
            <button type="submit" class="btn btn-primary">Standort speichern</button>
            <p class="favorites-loading-hint" hidden>Standort wird gespeichert...</p>
        </form>
    </div>
</div>

<div class="grid-2">
    <div class="card">
        <h2>Satelliten suchen</h2>
        <form method="get" action="" class="favorites-loading-form" data-loading-message="Satelliten werden gesucht. Das kann kurz dauern...">
            <div class="input-row">
                <input
                    type="text"
                    id="sat_q"
                    name="sat_q"
                    value="<?= h($satelliteSearchQuery) ?>"
                    placeholder="Name oder NORAD-ID, z. B. ISS oder 25544"
                >
                <button type="submit" class="btn btn-primary">Suchen</button>
            </div>
            <p class="favorites-loading-hint" hidden>Satelliten werden gesucht. Das kann kurz dauern...</p>
        </form>

        <?php if ($satelliteSearchQuery !== ''): ?>
            <div class="mt-xl">
                <h2>Suchergebnisse</h2>
                <?php if (empty($satelliteSearchResults)): ?>
                    <p class="hint">Keine passenden Satelliten gefunden.</p>
                <?php else: ?>
                    <table class="data-table">
                        <thead>
                            <tr>
                                <th>Name</th>
                                <th>NORAD</th>
                                <th></th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php foreach ($satelliteSearchResults as $satellite): ?>
                                <tr>
                                    <td><?= h($satellite['object_name']) ?></td>
                                    <td><?= h((string) $satellite['norad_cat_id']) ?></td>
                                    <td>
                                        <?php if ((int) $satellite['already_added'] === 1): ?>
                                            <span class="hint">Bereits hinzugefuegt</span>
                                        <?php else: ?>
                                            <form method="post" action="" class="favorites-loading-form" data-loading-message="Satellit wird hinzugefuegt...">
                                                <input type="hidden" name="action" value="add_satellite">
                                                <input type="hidden" name="satellite_id" value="<?= (int) $satellite['id'] ?>">
                                                <button type="submit" class="btn btn-sm btn-primary">Hinzufuegen</button>
                                            </form>
                                        <?php endif; ?>
                                    </td>
                                </tr>
                            <?php endforeach; ?>
                        </tbody>
                    </table>
                <?php endif; ?>
            </div>
        <?php endif; ?>
    </div>

    <div class="card">
        <h2>Kleinplaneten suchen</h2>
        <form method="get" action="" class="favorites-loading-form" data-loading-message="Kleinplaneten werden gesucht. Das kann etwas dauern...">
            <div class="input-row">
                <input
                    type="text"
                    id="mp_q"
                    name="mp_q"
                    value="<?= h($minorplanetSearchQuery) ?>"
                    placeholder="Nummer oder Bezeichnung, z. B. 1 oder Ceres"
                >
                <button type="submit" class="btn btn-primary">Suchen</button>
            </div>
            <p class="favorites-loading-hint" hidden>Kleinplaneten werden gesucht. Das kann etwas dauern...</p>
        </form>

        <?php if ($minorplanetSearchQuery !== ''): ?>
            <div class="mt-xl">
                <h2>Suchergebnisse</h2>
                <?php if (empty($minorplanetSearchResults)): ?>
                    <p class="hint">Keine passenden Kleinplaneten gefunden.</p>
                <?php else: ?>
                    <table class="data-table">
                        <thead>
                            <tr>
                                <th>Bezeichnung</th>
                                <th>Nummer</th>
                                <th></th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php foreach ($minorplanetSearchResults as $minorplanet): ?>
                                <tr>
                                    <td><?= h($minorplanet['designation_text'] ?: $minorplanet['desig_packed']) ?></td>
                                    <td><?= h($minorplanet['mp_number'] !== null ? (string) $minorplanet['mp_number'] : '—') ?></td>
                                    <td>
                                        <?php if ((int) $minorplanet['already_added'] === 1): ?>
                                            <span class="hint">Bereits hinzugefuegt</span>
                                        <?php else: ?>
                                            <form method="post" action="" class="favorites-loading-form" data-loading-message="Kleinplanet wird hinzugefuegt...">
                                                <input type="hidden" name="action" value="add_minorplanet">
                                                <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
                                                <button type="submit" class="btn btn-sm btn-primary">Hinzufuegen</button>
                                            </form>
                                        <?php endif; ?>
                                    </td>
                                </tr>
                            <?php endforeach; ?>
                        </tbody>
                    </table>
                <?php endif; ?>
            </div>
        <?php endif; ?>
    </div>
</div>

<div class="grid-2">
    <div class="card">
        <h2>Meine Satelliten</h2>
        <?php if (empty($trackedSatellites)): ?>
            <p class="hint">Du hast noch keine Satelliten ausgewählt.</p>
        <?php else: ?>
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Name</th>
                        <th>NORAD</th>
                        <th>Favorit</th>
                        <th>Hinzugefuegt</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($trackedSatellites as $satellite): ?>
                        <tr>
                            <td><?= h($satellite['object_name']) ?></td>
                            <td><?= h((string) $satellite['norad_cat_id']) ?></td>
                            <td><?= (int) $satellite['is_favorite'] === 1 ? '*' : '-' ?></td>
                            <td><?= h($satellite['created_at']) ?></td>
                            <td class="action-cell">
                                <?php if (count($trackedSatellites) <= 1 && (int) $satellite['is_favorite'] === 1): ?>
                                    <span class="hint">Favorit bleibt gesetzt</span>
                                <?php else: ?>
                                    <form method="post" action="" class="favorites-loading-form" data-loading-message="Satelliten-Favorit wird aktualisiert...">
                                        <input type="hidden" name="action" value="toggle_satellite_favorite">
                                        <input type="hidden" name="satellite_id" value="<?= (int) $satellite['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-secondary">
                                            <?= (int) $satellite['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
                                        </button>
                                    </form>
                                <?php endif; ?>
                                <?php if (count($trackedSatellites) > 1): ?>
                                    <form method="post" action="" class="favorites-loading-form" data-loading-message="Satellit wird entfernt..." onsubmit="return confirm('Satellit wirklich entfernen?');">
                                        <input type="hidden" name="action" value="remove_satellite">
                                        <input type="hidden" name="satellite_id" value="<?= (int) $satellite['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
                                    </form>
                                <?php else: ?>
                                    <span class="hint">Letzter Satellit</span>
                                <?php endif; ?>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        <?php endif; ?>
    </div>

    <div class="card">
        <h2>Meine Kleinplaneten</h2>
        <?php if (empty($trackedMinorplanets)): ?>
            <p class="hint">Du hast noch keine Kleinplaneten ausgewählt.</p>
        <?php else: ?>
            <table class="data-table">
                <thead>
                    <tr>
                        <th>Bezeichnung</th>
                        <th>Nummer</th>
                        <th>Favorit</th>
                        <th>Hinzugefuegt</th>
                        <th></th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($trackedMinorplanets as $minorplanet): ?>
                        <tr>
                            <td><?= h($minorplanet['designation_text'] ?: $minorplanet['desig_packed']) ?></td>
                            <td><?= h($minorplanet['mp_number'] !== null ? (string) $minorplanet['mp_number'] : '-') ?></td>
                            <td><?= (int) $minorplanet['is_favorite'] === 1 ? '*' : '-' ?></td>
                            <td><?= h($minorplanet['created_at']) ?></td>
                            <td class="action-cell">
                                <form method="post" action="" class="favorites-loading-form" data-loading-message="Kleinplaneten-Favorit wird aktualisiert...">
                                    <input type="hidden" name="action" value="toggle_minorplanet_favorite">
                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
                                    <button type="submit" class="btn btn-sm btn-secondary">
                                        <?= (int) $minorplanet['is_favorite'] === 1 ? 'Favorit entfernen' : 'Als Favorit' ?>
                                    </button>
                                </form>
                                <form method="post" action="" class="favorites-loading-form" data-loading-message="Kleinplanet wird entfernt..." onsubmit="return confirm('Kleinplanet wirklich entfernen?');">
                                    <input type="hidden" name="action" value="remove_minorplanet">
                                    <input type="hidden" name="minorplanet_id" value="<?= (int) $minorplanet['id'] ?>">
                                    <button type="submit" class="btn btn-sm btn-danger">Entfernen</button>
                                </form>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        <?php endif; ?>
    </div>
</div>

<script
    src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"
    integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo="
    crossorigin=""
></script>

<script>
(function () {
  const latInput = document.getElementById('latitude');
  const lonInput = document.getElementById('longitude');
  const elevationInput = document.getElementById('elevation');
  const timezoneInput = document.getElementById('timezone');
  const detectButton = document.getElementById('detect-location');
  const searchInput = document.getElementById('place-search');
  const searchButton = document.getElementById('search-place');
  const elevationButton = document.getElementById('lookup-elevation');
  const nameInput = document.getElementById('name');
  const mapEl = document.getElementById('map');

  if (!latInput || !lonInput || !elevationInput || !timezoneInput || !detectButton || !searchInput || !searchButton || !elevationButton || !nameInput || !mapEl || typeof L === 'undefined') {
    return;
  }

  const initialLat = parseFloat(<?= json_encode($mapLat) ?>);
  const initialLon = parseFloat(<?= json_encode($mapLon) ?>);
  const initialZoom = parseInt(<?= json_encode($mapZoom) ?>, 10);
  const map = L.map('map').setView([initialLat, initialLon], initialZoom);

  L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    maxZoom: 19,
    attribution: '&copy; OpenStreetMap-Mitwirkende'
  }).addTo(map);

  let marker = L.marker([initialLat, initialLon], { draggable: true }).addTo(map);

  function setInputs(lat, lon) {
    latInput.value = Number(lat).toFixed(7);
    lonInput.value = Number(lon).toFixed(7);
  }

  function setBrowserTimezoneIfEmpty() {
    if (!timezoneInput.value.trim()) {
      try {
        const tz = Intl.DateTimeFormat().resolvedOptions().timeZone;
        if (tz) {
          timezoneInput.value = tz;
        }
      } catch (e) {
      }
    }
  }

  function moveMarker(lat, lon, zoom = null) {
    marker.setLatLng([lat, lon]);
    if (zoom !== null) {
      map.setView([lat, lon], zoom);
    } else {
      map.panTo([lat, lon]);
    }
    setInputs(lat, lon);
    setBrowserTimezoneIfEmpty();
  }

  async function lookupElevation() {
    const lat = parseFloat(latInput.value);
    const lon = parseFloat(lonInput.value);

    if (!Number.isFinite(lat) || !Number.isFinite(lon)) {
      alert('Bitte zuerst einen gültigen Standort wählen.');
      return;
    }

    try {
      const url = 'https://api.open-elevation.com/api/v1/lookup?locations=' + encodeURIComponent(lat + ',' + lon);
      const response = await fetch(url, { method: 'GET' });
      if (!response.ok) {
        throw new Error('HTTP ' + response.status);
      }

      const data = await response.json();
      if (!data || !Array.isArray(data.results) || data.results.length === 0 || typeof data.results[0].elevation === 'undefined') {
        throw new Error('Keine Hoehendaten erhalten.');
      }

      elevationInput.value = data.results[0].elevation;
    } catch (error) {
      alert('Die Hoehe konnte nicht automatisch ermittelt werden.');
      console.error(error);
    }
  }

  marker.on('dragend', function (event) {
    const pos = event.target.getLatLng();
    setInputs(pos.lat, pos.lng);
  });

  map.on('click', function (event) {
    moveMarker(event.latlng.lat, event.latlng.lng);
  });

  detectButton.addEventListener('click', function () {
    if (!navigator.geolocation) {
      alert('Der Browser unterstuetzt keine Standortbestimmung.');
      return;
    }

    navigator.geolocation.getCurrentPosition(
      function (position) {
        moveMarker(position.coords.latitude, position.coords.longitude, 13);
        setBrowserTimezoneIfEmpty();
      },
      function (error) {
        let message = 'Standort konnte nicht ermittelt werden.';
        if (error && error.message) {
          message += ' ' + error.message;
        }
        alert(message);
      },
      {
        enableHighAccuracy: true,
        timeout: 10000,
        maximumAge: 0
      }
    );
  });

  async function doSearch() {
    const query = searchInput.value.trim();
    if (!query) {
      alert('Bitte einen Ort oder eine Adresse eingeben.');
      return;
    }

    try {
      const url = 'https://photon.komoot.io/api/?q=' + encodeURIComponent(query) + '&limit=5';
      const response = await fetch(url, { method: 'GET' });
      if (!response.ok) {
        throw new Error('HTTP ' + response.status);
      }

      const data = await response.json();
      if (!data.features || data.features.length === 0) {
        alert('Kein passender Ort gefunden.');
        return;
      }

      const feature = data.features[0];
      const coords = feature.geometry.coordinates;
      const lon = parseFloat(coords[0]);
      const lat = parseFloat(coords[1]);
      moveMarker(lat, lon, 13);

      const props = feature.properties || {};
      const parts = [];
      if (props.name) parts.push(props.name);
      if (props.city && props.city !== props.name) parts.push(props.city);
      if (props.state) parts.push(props.state);
      if (props.country) parts.push(props.country);
      nameInput.value = parts.length > 0 ? parts.join(', ') : query;
      setBrowserTimezoneIfEmpty();
    } catch (error) {
      alert('Die Ortssuche ist fehlgeschlagen.');
      console.error(error);
    }
  }

  searchButton.addEventListener('click', doSearch);
  elevationButton.addEventListener('click', lookupElevation);
  searchInput.addEventListener('keydown', function (event) {
    if (event.key === 'Enter') {
      event.preventDefault();
      doSearch();
    }
  });

  if (!latInput.value || !lonInput.value) {
    setInputs(initialLat, initialLon);
  }

  setBrowserTimezoneIfEmpty();
})();

document.querySelectorAll('.favorites-loading-form').forEach((form) => {
  form.addEventListener('submit', () => {
    const message = form.dataset.loadingMessage || 'Bitte warten...';
    let hint = form.querySelector('.favorites-loading-hint');

    if (!hint) {
      hint = document.createElement('p');
      hint.className = 'favorites-loading-hint';
      form.appendChild(hint);
    }

    hint.textContent = message;
    hint.hidden = false;
    form.classList.add('is-loading');

    form.querySelectorAll('button, input, select, textarea').forEach((field) => {
      if (field.tagName === 'INPUT' && field.type === 'hidden') {
        return;
      }
      field.setAttribute('aria-busy', 'true');
      if (field.tagName === 'BUTTON') {
        field.disabled = true;
      }
    });
  });
});
</script>

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