/** Роли доступа к разделам админки (согласовано с меню и маршрутами). */
export type AdminRole = 'superadmin' | 'admin' | 'moderator' | 'support';

export const ROUTE_ACCESS: Record<string, AdminRole[] | undefined> = {
    '/dashboard': undefined,
    '/profile': undefined,
    '/monitoring': undefined,
    '/inbox/reports': ['superadmin', 'admin', 'moderator'],
    '/inbox/tickets': ['superadmin', 'admin', 'support'],
    '/inbox/automod': ['superadmin', 'admin', 'moderator'],
    '/users': ['superadmin', 'admin'],
    '/calendars': ['superadmin', 'admin'],
    '/events': ['superadmin', 'admin'],
    '/reports': ['superadmin', 'admin', 'moderator'],
    '/reviews': ['superadmin', 'admin', 'moderator'],
    '/banned-words': ['superadmin', 'admin'],
    '/automod-settings': ['superadmin', 'admin'],
    '/tickets': ['superadmin', 'admin', 'support'],
    '/subscriptions': ['superadmin', 'admin'],
    '/admins': ['superadmin'],
    '/audit': ['superadmin'],
};

export type NavItem = {
    key: string;
    label: string;
    roles?: AdminRole[];
};

export type NavGroup = {
    id: string;
    label: string;
    items: NavItem[];
};

/** Группы навигации Control Center (label = i18n key). */
export const NAV_GROUPS: NavGroup[] = [
    {
        id: 'work',
        label: 'navGroup.work',
        items: [
            { key: '/inbox/reports', label: 'nav.inboxReports', roles: ['superadmin', 'admin', 'moderator'] },
            { key: '/inbox/tickets', label: 'nav.inboxTickets', roles: ['superadmin', 'admin', 'support'] },
            { key: '/inbox/automod', label: 'nav.inboxAutomod', roles: ['superadmin', 'admin', 'moderator'] },
        ],
    },
    {
        id: 'overview',
        label: 'navGroup.overview',
        items: [
            { key: '/dashboard', label: 'nav.dashboard' },
            { key: '/monitoring', label: 'nav.monitoring' },
        ],
    },
    {
        id: 'content',
        label: 'navGroup.content',
        items: [
            { key: '/users', label: 'nav.users', roles: ['superadmin', 'admin'] },
            { key: '/calendars', label: 'nav.calendars', roles: ['superadmin', 'admin'] },
            { key: '/events', label: 'nav.events', roles: ['superadmin', 'admin'] },
            { key: '/subscriptions', label: 'nav.subscriptions', roles: ['superadmin', 'admin'] },
        ],
    },
    {
        id: 'moderation',
        label: 'navGroup.moderation',
        items: [
            { key: '/reports', label: 'nav.reports', roles: ['superadmin', 'admin', 'moderator'] },
            { key: '/reviews', label: 'nav.reviews', roles: ['superadmin', 'admin', 'moderator'] },
            { key: '/banned-words', label: 'nav.bannedWords', roles: ['superadmin', 'admin'] },
            { key: '/automod-settings', label: 'nav.automodSettings', roles: ['superadmin', 'admin'] },
            { key: '/tickets', label: 'nav.tickets', roles: ['superadmin', 'admin', 'support'] },
        ],
    },
    {
        id: 'system',
        label: 'navGroup.system',
        items: [
            { key: '/admins', label: 'nav.admins', roles: ['superadmin'] },
            { key: '/audit', label: 'nav.audit', roles: ['superadmin'] },
        ],
    },
];

/** Плоский список для совместимости и getMenuSelectedKey. */
export const MENU_ITEMS: NavItem[] = NAV_GROUPS.flatMap((g) => g.items);

export function canAccessRoute(pathname: string, role: string | undefined): boolean {
    if (!role) return false;
    const base = pathname.split('/').slice(0, 2).join('/') || '/';
    const inboxBase = pathname.startsWith('/inbox/') ? pathname.split('/').slice(0, 3).join('/') : null;
    const check = inboxBase ?? base;
    const allowed = ROUTE_ACCESS[check] ?? ROUTE_ACCESS[base];
    if (allowed === undefined) {
        return ROUTE_ACCESS[pathname] === undefined || ROUTE_ACCESS[pathname]!.includes(role as AdminRole);
    }
    return allowed.includes(role as AdminRole);
}

export function filterMenuByRole<T extends { roles?: AdminRole[] }>(
    items: T[],
    role: string | undefined
): T[] {
    return items.filter((item) => !item.roles || (role && item.roles.includes(role as AdminRole)));
}

export function filterNavGroupsByRole(groups: NavGroup[], role: string | undefined): NavGroup[] {
    return groups
        .map((group) => ({
            ...group,
            items: filterMenuByRole(group.items, role),
        }))
        .filter((group) => group.items.length > 0);
}

/** Ключ пункта меню для detail-маршрутов (/users/:id → /users). */
export function getMenuSelectedKey(pathname: string): string {
    if (MENU_ITEMS.some((item) => item.key === pathname)) {
        return pathname;
    }
    if (pathname.startsWith('/inbox/')) {
        const parts = pathname.split('/').filter(Boolean);
        if (parts.length >= 2) return `/inbox/${parts[1]}`;
    }
    const segment = pathname.split('/').filter(Boolean)[0];
    if (segment) {
        const parent = `/${segment}`;
        if (MENU_ITEMS.some((item) => item.key === parent)) {
            return parent;
        }
    }
    return pathname;
}

const WS_NOTIFICATION_ROUTES: Record<'report_created' | 'ticket_created' | 'automod_hit', string> = {
    report_created: '/inbox/reports',
    ticket_created: '/inbox/tickets',
    automod_hit: '/inbox/automod',
};

export function canReceiveWsNotification(
    type: 'report_created' | 'ticket_created' | 'automod_hit',
    role: string | undefined
): boolean {
    return canAccessRoute(WS_NOTIFICATION_ROUTES[type], role);
}

/** Стартовая страница по роли после логина. */
export function getDefaultRouteForRole(role: AdminRole | undefined): string {
    if (role === 'moderator') return '/inbox/reports';
    if (role === 'support') return '/inbox/tickets';
    return '/dashboard';
}