<?php
declare(strict_types=1);

require_once __DIR__ . '/db.php';

try {
    match ($_SERVER['REQUEST_METHOD']) {
        'GET'  => handle_get(),
        'POST' => handle_post(),
        default => error_out('Method not allowed', 405),
    };
} catch (PDOException $e) {
    error_out('Database error: ' . $e->getMessage(), 500);
}

// ─── GET /api/admin.php ───────────────────────────────────────────────────────

function handle_get(): never
{
    $db = db(); // migrations run inside db()

    $sandbox_mode = (bool) (int) ($db->query(
        "SELECT setting_value FROM `system` WHERE setting_name = 'sandbox_mode'"
    )->fetchColumn());

    $counts = $db->query(
        "SELECT
            COUNT(*)                                               AS total,
            SUM(is_sandbox = 1)                                    AS sandbox_count,
            SUM(is_sandbox = 0 AND status IN ('sent','delivered')) AS real_sent,
            SUM(is_sandbox = 0 AND status = 'failed')              AS real_failed
         FROM delivery_log"
    )->fetch();

    $groups_raw = $_SERVER['HTTP_X_AUTHENTIK_GROUPS']   ?? '';
    $groups     = ($groups_raw !== '') ? explode('|', $groups_raw) : [];
    $is_admin   = in_array('imf_sms_admin', $groups, true);
    $username   = $_SERVER['HTTP_X_AUTHENTIK_USERNAME'] ?? '';
    $name       = $_SERVER['HTTP_X_AUTHENTIK_NAME']     ?? $username;

    json_out([
        'sandbox_mode'             => $sandbox_mode,
        'is_admin'                 => $is_admin,
        'username'                 => $username,
        'name'                     => $name,
        'delivery_log_total'       => (int) ($counts['total']         ?? 0),
        'delivery_log_sandbox'     => (int) ($counts['sandbox_count'] ?? 0),
        'delivery_log_real_sent'   => (int) ($counts['real_sent']     ?? 0),
        'delivery_log_real_failed' => (int) ($counts['real_failed']   ?? 0),
        'attendees'                => (int) $db->query('SELECT COUNT(*) FROM attendees')->fetchColumn(),
        'templates'                => (int) $db->query('SELECT COUNT(*) FROM sms_templates')->fetchColumn(),
        'schedules'                => (int) $db->query('SELECT COUNT(*) FROM scheduled_rules')->fetchColumn(),
    ]);
}

// ─── Admin guard ─────────────────────────────────────────────────────────────

function require_admin(): void
{
    $groups_raw = $_SERVER['HTTP_X_AUTHENTIK_GROUPS'] ?? '';
    $groups     = ($groups_raw !== '') ? explode('|', $groups_raw) : [];
    if (!in_array('imf_sms_admin', $groups, true)) {
        error_out('Forbidden — requires imf_sms_admin group', 403);
    }
}

// ─── POST /api/admin.php ──────────────────────────────────────────────────────

function handle_post(): never
{
    require_admin();

    $body   = json_body();
    $action = (string) ($body['action'] ?? '');

    match ($action) {
        'toggle_sandbox'   => action_toggle_sandbox(),
        'mark_all_sandbox' => action_mark_all_sandbox(),
        'purge'            => action_purge($body),
        default            => error_out('Unknown action'),
    };
}

function action_toggle_sandbox(): never
{
    $db      = db();
    $current = (int) $db->query(
        "SELECT setting_value FROM `system` WHERE setting_name = 'sandbox_mode'"
    )->fetchColumn();
    $new = $current ? '0' : '1';
    $db->prepare(
        "UPDATE `system` SET setting_value = :v WHERE setting_name = 'sandbox_mode'"
    )->execute([':v' => $new]);
    json_out(['sandbox_mode' => (bool) (int) $new]);
}

function action_mark_all_sandbox(): never
{
    db()->exec('UPDATE delivery_log SET is_sandbox = 1');
    json_out(['updated' => true]);
}

function action_purge(array $body): never
{
    $target = (string) ($body['target'] ?? '');
    $db     = db();

    match ($target) {
        'delivery_log' => purge_delivery_log($db, $body),
        'attendees'    => purge_attendees($db),
        'templates'    => purge_templates($db),
        'schedules'    => purge_schedules($db),
        default        => error_out('Unknown purge target'),
    };
}

function purge_delivery_log(PDO $db, array $body): never
{
    $before = isset($body['before']) ? trim((string) $body['before']) : '';
    if ($before !== '') {
        if (strtotime($before) === false) {
            error_out('Invalid date');
        }
        $stmt = $db->prepare('DELETE FROM delivery_log WHERE sent_at < :before');
        $stmt->execute([':before' => $before]);
        json_out(['purged' => $stmt->rowCount()]);
    }
    $db->exec('DELETE FROM delivery_log');
    json_out(['purged' => true]);
}

function purge_attendees(PDO $db): never
{
    $db->exec('DELETE FROM registrations');
    $db->exec('DELETE FROM attendees');
    $db->exec('DELETE FROM workshop_sessions');
    json_out(['purged' => true]);
}

function purge_templates(PDO $db): never
{
    $db->exec('DELETE FROM sms_templates');
    json_out(['purged' => true]);
}

function purge_schedules(PDO $db): never
{
    $db->exec('DELETE FROM scheduled_rules');
    json_out(['purged' => true]);
}