const STORAGE_KEY = 'nitro.access.token';
const EXPIRES_KEY = 'nitro.access.token.exp';

export const setAccessToken = (token: string | null | undefined, expiresAt?: number | null): void =>
{
    try
    {
        if(token && typeof token === 'string')
        {
            window.localStorage.setItem(STORAGE_KEY, token);
            if(typeof expiresAt === 'number' && expiresAt > 0) window.localStorage.setItem(EXPIRES_KEY, String(expiresAt));
            else window.localStorage.removeItem(EXPIRES_KEY);
        }
        else
        {
            window.localStorage.removeItem(STORAGE_KEY);
            window.localStorage.removeItem(EXPIRES_KEY);
        }
    }
    catch {}
};

export const getAccessToken = (): string =>
{
    try { return window.localStorage.getItem(STORAGE_KEY) ?? ''; }
    catch { return ''; }
};

export const getAccessTokenExpiresAt = (): number =>
{
    try
    {
        const raw = window.localStorage.getItem(EXPIRES_KEY);
        if(!raw) return 0;
        const value = parseInt(raw, 10);
        return Number.isFinite(value) ? value : 0;
    }
    catch { return 0; }
};

export const clearAccessToken = (): void =>
{
    setAccessToken(null);
};

export const persistAccessTokenFromPayload = (payload: Record<string, unknown> | null | undefined): void =>
{
    if(!payload) return;
    const token = typeof payload.accessToken === 'string' ? payload.accessToken : '';
    const expiresAt = typeof payload.accessTokenExpiresAt === 'number' ? payload.accessTokenExpiresAt : null;
    if(token) setAccessToken(token, expiresAt);
};