/**
 * Offline verification: end-of-course flow (Session 11 → training done → post → finished).
 * Run: npx tsx --tsconfig tsconfig.json scripts/verify-end-to-end-course-flow.ts
 *
 * Does NOT call AI. Uses programService + journey permission rules + storage helpers.
 */
import { PROGRAM_SESSION_COUNT } from '../src/data/program/sessions';
import {
  completeSession,
  getProgramProgress,
  isProgramCompleted,
  resetProgramProgress
} from '../src/services/programService';
import {
  getLatestByPhase,
  isPhaseCompleted,
  saveAssessment,
  type AssessmentSubmission
} from '../src/services/assessmentService';
import { PCQ24_QUESTIONS } from '../src/config/pcq24';

// Minimal localStorage for Node
const store = new Map<string, string>();
(globalThis as unknown as { localStorage: Storage }).localStorage = {
  getItem: (k: string) => store.get(k) ?? null,
  setItem: (k: string, v: string) => {
    store.set(k, v);
  },
  removeItem: (k: string) => {
    store.delete(k);
  },
  clear: () => store.clear(),
  key: () => null,
  get length() {
    return store.size;
  }
};

type LearningProgress = {
  user_id: string;
  current_step: string;
  pre_test_completed_at: string | null;
  training_started_at: string | null;
  training_completed_at: string | null;
  post_test_completed_at: string | null;
};

const journeyKey = (userId: string) => `learning-progress:${userId}`;

const readJourney = (userId: string): LearningProgress => {
  const raw = localStorage.getItem(journeyKey(userId));
  if (!raw) {
    return {
      user_id: userId,
      current_step: 'registered',
      pre_test_completed_at: null,
      training_started_at: null,
      training_completed_at: null,
      post_test_completed_at: null
    };
  }
  return JSON.parse(raw) as LearningProgress;
};

const writeJourney = (progress: LearningProgress) => {
  localStorage.setItem(journeyKey(progress.user_id), JSON.stringify(progress));
};

/** Mirrors useLearningJourney permissions */
const permissionsOf = (progress: LearningProgress) => ({
  canTakePreTest: !progress.pre_test_completed_at,
  canOpenTraining: Boolean(progress.pre_test_completed_at),
  canTakePostTest: Boolean(
    progress.pre_test_completed_at &&
      progress.training_completed_at &&
      !progress.post_test_completed_at
  ),
  isCompleted: Boolean(progress.post_test_completed_at)
});

/** Mirrors HomeRedirect */
const resolveRoot = (progress: LearningProgress): string => {
  if (!progress.pre_test_completed_at) return '/assessment/pre';
  if (!progress.training_completed_at) return '/chat';
  if (!progress.post_test_completed_at) return '/assessment/post';
  return '/finished';
};

/** Mirrors ChatPage Session 11 completion side-effects (without React) */
const applyFinalSessionCompletion = (userId: string, sessionOrder: number) => {
  const updated = completeSession(userId, sessionOrder);
  const isFinal =
    sessionOrder >= PROGRAM_SESSION_COUNT || Boolean(updated.completedAt);
  if (isFinal) {
    const now = new Date().toISOString();
    const base = readJourney(userId);
    if (!base.training_completed_at) {
      writeJourney({
        ...base,
        training_started_at: base.training_started_at || now,
        training_completed_at: now
      });
    }
  }
  return { updated, isFinal };
};

let passed = 0;
let failed = 0;
const assert = (name: string, condition: boolean) => {
  if (condition) {
    passed += 1;
    console.log(`PASS: ${name}`);
    return;
  }
  failed += 1;
  console.error(`FAIL: ${name}`);
};

const USER = 'e2e-flow-user';
store.clear();
resetProgramProgress(USER);
writeJourney({
  user_id: USER,
  current_step: 'pre_test_done',
  pre_test_completed_at: new Date().toISOString(),
  training_started_at: new Date().toISOString(),
  training_completed_at: null,
  post_test_completed_at: null
});

// --- Root routing before training complete ---
assert('root → /chat when training incomplete', resolveRoot(readJourney(USER)) === '/chat');
assert(
  'post locked before training_completed_at',
  permissionsOf(readJourney(USER)).canTakePostTest === false
);

// --- Complete sessions 1..10 (sequential), then 11 ---
for (let order = 1; order <= 10; order++) {
  completeSession(USER, order);
}
assert('after 10 sessions program not complete', isProgramCompleted(USER) === false);
assert(
  'training still incomplete after 10',
  readJourney(USER).training_completed_at === null
);

const final = applyFinalSessionCompletion(USER, 11);
assert('session 11 marks program completedAt', Boolean(final.updated.completedAt));
assert('session 11 isFinal', final.isFinal === true);
assert('training_completed_at set after session 11', Boolean(readJourney(USER).training_completed_at));
assert(
  'post unlocked after training_completed_at',
  permissionsOf(readJourney(USER)).canTakePostTest === true
);
assert('root → /assessment/post after training', resolveRoot(readJourney(USER)) === '/assessment/post');
assert(
  'all 11 sessions listed completed',
  getProgramProgress(USER).completedSessions.length === PROGRAM_SESSION_COUNT
);

// --- Refresh persistence (re-read storage) ---
const journeyAfterReload = readJourney(USER);
const programAfterReload = getProgramProgress(USER);
assert('persist training_completed_at', Boolean(journeyAfterReload.training_completed_at));
assert('persist program completedAt', Boolean(programAfterReload.completedAt));
assert(
  'persist post unlock',
  permissionsOf(journeyAfterReload).canTakePostTest === true
);

// --- Post-test submission (scoring storage) + journey mark ---
const answers = PCQ24_QUESTIONS.map((q) => ({
  questionId: q.id,
  selectedValue: '4'
}));
await saveAssessment({ userId: USER, phase: 'post', answers });
assert('post assessment stored', isPhaseCompleted(USER, 'post') === true);

const now = new Date().toISOString();
writeJourney({
  ...readJourney(USER),
  current_step: 'completed',
  post_test_completed_at: now
});
assert('root → /finished after post', resolveRoot(readJourney(USER)) === '/finished');
assert('permissions.isCompleted', permissionsOf(readJourney(USER)).isCompleted === true);
assert('canTakePostTest false after post', permissionsOf(readJourney(USER)).canTakePostTest === false);

// --- Duplicate post guard (existing storage + journey) ---
const beforeDup = getLatestByPhase(USER, 'post') as AssessmentSubmission;
assert('existing post submission present', beforeDup !== null);
assert(
  'duplicate blocked by journey permission',
  permissionsOf(readJourney(USER)).canTakePostTest === false
);
assert(
  'duplicate blocked by isPhaseCompleted',
  isPhaseCompleted(USER, 'post') === true
);

// --- Finished refresh ---
assert('finished still available after reload', resolveRoot(readJourney(USER)) === '/finished');

console.log(`\n${passed} passed, ${failed} failed`);
if (failed > 0) process.exit(1);