import type { SessionUser } from '@/types/roles';

/**
 * Sprint 0 mock — no backend yet. The session is selected from /login
 * and persisted in sessionStorage so route navigations preserve role.
 * Real auth lands later (D-003: local user/password v1, Keycloak OIDC v2).
 */

const STORAGE_KEY = 'mimic.mock.session';

export const MOCK_SESSIONS: Record<string, SessionUser> = {
  rt_operator: {
    id: 'usr_001',
    displayName: 'M. Dubreuil',
    role: 'rt_operator',
    engagementId: 'eng_42',
    engagementName: 'Démo Client X',
  },
  rt_lead: {
    id: 'usr_002',
    displayName: 'A. Verlhac',
    role: 'rt_lead',
    engagementId: 'eng_42',
    engagementName: 'Démo Client X',
  },
  soc_analyst: {
    id: 'usr_soc_07',
    displayName: 'SOC · session #07',
    role: 'soc_analyst',
    engagementId: 'eng_42',
    engagementName: 'Démo Client X',
  },
};

export function readMockSession(): SessionUser | null {
  try {
    const raw = sessionStorage.getItem(STORAGE_KEY);
    if (!raw) return null;
    const parsed: unknown = JSON.parse(raw);
    if (
      typeof parsed === 'object' &&
      parsed !== null &&
      'role' in parsed &&
      typeof (parsed as SessionUser).role === 'string'
    ) {
      return parsed as SessionUser;
    }
    return null;
  } catch {
    return null;
  }
}

export function writeMockSession(user: SessionUser): void {
  sessionStorage.setItem(STORAGE_KEY, JSON.stringify(user));
}

export function clearMockSession(): void {
  sessionStorage.removeItem(STORAGE_KEY);
}