/**
 * Application data client.
 *
 * The reference app talks to a Base44 backend through this module. The demo
 * keeps the module path, the export name, and the full method contract, and
 * swaps the transport for the local store in `store.js` and the local AI engine
 * in `aiEngine.js`. Nothing downstream — hooks, pages, components — knows or
 * cares, which is exactly the point: the seam stays where it was.
 */

import { createEntity, initStore, resetStore } from './store';
import { invokeLLM, uploadFile } from './aiEngine';
import { DEMO_USER, seedData } from './seed';

initStore(seedData);

const ENTITY_NAMES = [
  'JobPosting', 'JobApplication', 'AIInterview', 'Staff', 'WorkerProfile',
  'Course', 'Badge', 'LearningPath', 'Certification', 'RoleCategory',
  'UserActivity', 'Evidence', 'User',
  /* Who is on which position, and for how long. The record that turns "hired"
     into workforce allocation: without it a position knows its demand and its
     applicants but not who is actually covering it. */
  'Assignment',
  /* Shifts worked, missed and overrun. The operational record behind
     attendance and overtime analysis — see `api/attendanceSeed.js`. */
  'ShiftRecord',
];

const entities = Object.fromEntries(
  ENTITY_NAMES.map((name) => [name, createEntity(name)])
);

/* ── Auth ──────────────────────────────────────────────────────────────── */

const SESSION_KEY = 'krow_demo_user';

function loadUser() {
  try {
    const raw = localStorage.getItem(SESSION_KEY);
    return raw ? { ...DEMO_USER, ...JSON.parse(raw) } : { ...DEMO_USER };
  } catch {
    return { ...DEMO_USER };
  }
}

let currentUser = loadUser();

/**
 * Writes the session user, and says whether it actually landed.
 *
 * The old version was `try { setItem } catch {}` — a swallowed
 * `QuotaExceededError` or a private-browsing refusal, and the caller was handed
 * a user object indistinguishable from a successful write. For preferences that
 * is invisible; for `customSkills`, which is where every account-authored skill
 * definition lives, it is the whole "I saved it and it was gone" report: the
 * toast said added, the list showed it, the reload did not.
 *
 * The read-back matters as much as the catch. A write can be accepted and then
 * evicted, and a serialisation can land truncated; comparing what came back
 * with what went in is the only way to know the record is really there.
 */
function persistUser() {
  const payload = JSON.stringify(currentUser);
  try {
    localStorage.setItem(SESSION_KEY, payload);
  } catch (error) {
    return { persisted: false, error };
  }
  try {
    if (localStorage.getItem(SESSION_KEY) !== payload) {
      return { persisted: false, error: new Error('The session record did not survive the write.') };
    }
  } catch (error) {
    return { persisted: false, error };
  }
  return { persisted: true, error: null };
}

const auth = {
  /** The demo is always signed in as the seeded employer/admin user. */
  async me() {
    return { ...currentUser };
  },

  async updateMe(patch) {
    currentUser = { ...currentUser, ...patch };
    persistUser();
    return { ...currentUser };
  },

  /**
   * Preferences, read synchronously.
   *
   * `me()` is async because the real client fetches, but the panel provider has
   * to decide whether Owliver starts open during its first render — one tick
   * later is a visible flash of the wrong workspace. The session user is already
   * hydrated from localStorage at module load, so this is a plain read of the
   * same record `me()` returns, not a second copy of the state.
   */
  preferences() {
    return { ...DEMO_USER.preferences, ...(currentUser.preferences || {}) };
  },

  /**
   * Merges into the stored preferences and persists with the rest of the user.
   *
   * Returns the write's outcome alongside the record, rather than the record
   * alone. Preferences are where account-authored skills live, so "did this
   * survive the reload" is a question the caller has to be able to answer —
   * see `persistUser`.
   */
  async updatePreferences(patch) {
    currentUser = { ...currentUser, preferences: { ...auth.preferences(), ...patch } };
    const write = persistUser();
    return { user: { ...currentUser }, ...write };
  },

  isAuthenticated() {
    return true;
  },

  /**
   * There is no identity provider to sign out of, so this clears the local
   * session and returns to the requested page.
   */
  logout(redirectTo = '/') {
    try {
      localStorage.removeItem(SESSION_KEY);
    } catch {
      // Ignore.
    }
    currentUser = { ...DEMO_USER };
    window.location.href = typeof redirectTo === 'string' ? redirectTo : '/';
  },

  redirectToLogin() {
    window.location.href = '/';
  },
};

/* ── Integrations & analytics ───────────────────────────────────────────── */

const integrations = {
  Core: {
    InvokeLLM: invokeLLM,
    UploadFile: uploadFile,
  },
};

const analytics = {
  track({ eventName, properties } = {}) {
    if (import.meta.env.DEV) {
      console.debug('[krow-demo] analytics', eventName, properties || {});
    }
  },
};

export const base44 = { entities, auth, integrations, analytics };

/** Restores the shipped demo data, discarding local edits. */
export function resetDemoData() {
  resetStore(seedData);
  window.location.reload();
}