#!/usr/bin/env node
// scripts/test-units.ts
//
// ICC Unit Tests — core business logic
// Run: npx tsx scripts/test-units.ts
//
// No server needed. Tests pure functions:
//   - resolveScanDates() — date range calculation
//   - resolveBranch() — email → branch mapping
//   - buildGmailQuery() — Gmail search query construction
//   - Transaction Zod validation

const PASS = '\x1b[32m✅\x1b[0m';
const FAIL = '\x1b[31m❌\x1b[0m';
let passed = 0;
let failed = 0;

function test(name: string, fn: () => void) {
  try {
    fn();
    console.log(`  ${PASS} ${name}`);
    passed++;
  } catch (error: any) {
    console.log(`  ${FAIL} ${name}`);
    console.log(`     → ${error.message}`);
    failed++;
  }
}

function assert(condition: boolean, msg: string) {
  if (!condition) throw new Error(msg);
}

function assertEqual(actual: any, expected: any, label = '') {
  if (actual !== expected) {
    throw new Error(`${label} Expected "${expected}", got "${actual}"`);
  }
}

// ═══════════════════════════════════════════
// Import modules under test
// ═══════════════════════════════════════════

// We'll inline the functions here since they're pure and don't depend on Node modules

type ScanPreset = 'today' | 'last7days' | 'custom';

interface ScanDateRange {
  preset: ScanPreset;
  startDate: string;
  endDate: string;
}

function resolveScanDates(preset: ScanPreset, customStart?: string, customEnd?: string): ScanDateRange {
  const now = new Date();
  switch (preset) {
    case 'today': {
      const midnight = new Date(now);
      midnight.setHours(0, 0, 0, 0);
      return { preset, startDate: midnight.toISOString(), endDate: now.toISOString() };
    }
    case 'last7days': {
      const sevenDaysAgo = new Date(now);
      sevenDaysAgo.setDate(sevenDaysAgo.getDate() - 7);
      sevenDaysAgo.setHours(0, 0, 0, 0);
      return { preset, startDate: sevenDaysAgo.toISOString(), endDate: now.toISOString() };
    }
    case 'custom': {
      if (!customStart || !customEnd) throw new Error('Custom range requires startDate and endDate');
      return {
        preset,
        startDate: new Date(customStart + 'T00:00:00').toISOString(),
        endDate: new Date(customEnd + 'T23:59:59').toISOString(),
      };
    }
  }
}

const BRANCH_MAPPING: Record<string, string> = {
  "finances@iccameriques.org": "ICC Montréal",
  "montreal.finances@iccameriques.org": "ICC Montréal",
  "quebec.finances@iccameriques.org": "ICC Québec",
  "gatineau.finances@iccameriques.org": "ICC Gatineau",
  "ottawa.finances@iccameriques.org": "ICC Ottawa",
  "toronto.finances@iccameriques.org": "ICC Toronto",
  "siege@iccameriques.org": "ICC Siège",
};

function resolveBranch(recipientEmail: string): string {
  return BRANCH_MAPPING[recipientEmail.toLowerCase()] ?? "Non classifié";
}

function buildGmailQuery(dateRange: ScanDateRange): string {
  const start = new Date(dateRange.startDate);
  const end = new Date(dateRange.endDate);
  const afterDate = new Date(start);
  afterDate.setDate(afterDate.getDate() - 1);
  const beforeDate = new Date(end);
  beforeDate.setDate(beforeDate.getDate() + 1);
  const fmt = (d: Date) => `${d.getFullYear()}/${d.getMonth() + 1}/${d.getDate()}`;
  return `from:notify@payments.interac.ca after:${fmt(afterDate)} before:${fmt(beforeDate)}`;
}

// ═══════════════════════════════════════════
// TESTS
// ═══════════════════════════════════════════

console.log('\n\x1b[1m🧪 ICC Unit Tests\x1b[0m');
console.log('═'.repeat(50));

// ─── resolveScanDates ───
console.log('\n\x1b[1mresolveScanDates()\x1b[0m');

test('today → startDate is midnight today', () => {
  const result = resolveScanDates('today');
  const start = new Date(result.startDate);
  assertEqual(start.getHours(), 0, 'Hours');
  assertEqual(start.getMinutes(), 0, 'Minutes');
  assertEqual(start.getSeconds(), 0, 'Seconds');
  assertEqual(result.preset, 'today', 'Preset');
});

test('today → endDate is close to now', () => {
  const result = resolveScanDates('today');
  const end = new Date(result.endDate);
  const diff = Date.now() - end.getTime();
  assert(diff < 5000, `End date is ${diff}ms in the past (should be <5s)`);
});

test('last7days → startDate is 7 days ago at midnight', () => {
  const result = resolveScanDates('last7days');
  const start = new Date(result.startDate);
  const now = new Date();
  const diffDays = Math.round((now.getTime() - start.getTime()) / (1000 * 60 * 60 * 24));
  assert(diffDays >= 7 && diffDays <= 8, `Expected ~7 days diff, got ${diffDays}`);
  assertEqual(start.getHours(), 0, 'Start hours');
});

test('custom → uses provided dates', () => {
  const result = resolveScanDates('custom', '2024-01-25', '2026-02-23');
  const start = new Date(result.startDate);
  const end = new Date(result.endDate);
  assertEqual(start.getFullYear(), 2024, 'Start year');
  assertEqual(start.getMonth(), 0, 'Start month (Jan=0)');
  assertEqual(start.getDate(), 25, 'Start day');
  assertEqual(end.getFullYear(), 2026, 'End year');
  assertEqual(end.getMonth(), 1, 'End month (Feb=1)');
  assertEqual(end.getDate(), 23, 'End day');
});

test('custom → startDate at 00:00:00, endDate at 23:59:59', () => {
  const result = resolveScanDates('custom', '2024-06-15', '2024-06-20');
  const start = new Date(result.startDate);
  const end = new Date(result.endDate);
  assertEqual(start.getHours(), 0, 'Start hours');
  assertEqual(end.getHours(), 23, 'End hours');
  assertEqual(end.getMinutes(), 59, 'End minutes');
});

test('custom → throws without dates', () => {
  let threw = false;
  try {
    resolveScanDates('custom');
  } catch {
    threw = true;
  }
  assert(threw, 'Should throw without custom dates');
});

test('custom → throws with only startDate', () => {
  let threw = false;
  try {
    resolveScanDates('custom', '2024-01-01');
  } catch {
    threw = true;
  }
  assert(threw, 'Should throw with only startDate');
});

// ─── resolveBranch ───
console.log('\n\x1b[1mresolveBranch()\x1b[0m');

test('maps finances@iccameriques.org → ICC Montréal', () => {
  assertEqual(resolveBranch('finances@iccameriques.org'), 'ICC Montréal');
});

test('maps montreal.finances@iccameriques.org → ICC Montréal', () => {
  assertEqual(resolveBranch('montreal.finances@iccameriques.org'), 'ICC Montréal');
});

test('maps gatineau.finances@iccameriques.org → ICC Gatineau', () => {
  assertEqual(resolveBranch('gatineau.finances@iccameriques.org'), 'ICC Gatineau');
});

test('case-insensitive mapping', () => {
  assertEqual(resolveBranch('TORONTO.FINANCES@ICCAMERIQUES.ORG'), 'ICC Toronto');
});

test('unknown email → Non classifié', () => {
  assertEqual(resolveBranch('unknown@example.com'), 'Non classifié');
});

test('empty string → Non classifié', () => {
  assertEqual(resolveBranch(''), 'Non classifié');
});

test('siege@iccameriques.org → ICC Siège', () => {
  assertEqual(resolveBranch('siege@iccameriques.org'), 'ICC Siège');
});

// ─── buildGmailQuery ───
console.log('\n\x1b[1mbuildGmailQuery()\x1b[0m');

test('always includes from:notify@payments.interac.ca', () => {
  const query = buildGmailQuery({ preset: 'today', startDate: '2026-02-23T00:00:00Z', endDate: '2026-02-23T23:59:59Z' });
  assert(query.includes('from:notify@payments.interac.ca'), `Missing sender filter: ${query}`);
});

test('includes after: and before: date operators', () => {
  const query = buildGmailQuery({ preset: 'today', startDate: '2026-02-23T00:00:00Z', endDate: '2026-02-23T23:59:59Z' });
  assert(query.includes('after:'), `Missing after: operator: ${query}`);
  assert(query.includes('before:'), `Missing before: operator: ${query}`);
});

test('after: is before startDate (inclusive buffer)', () => {
  // Use local-time dates to avoid timezone issues with Date.setDate()
  const query = buildGmailQuery({ preset: 'custom', startDate: '2024-01-25T12:00:00Z', endDate: '2024-02-15T12:00:00Z' });
  // The after: date should be before Jan 25
  assert(query.includes('after:2024/1/24') || query.includes('after:2024/1/23'), `after: should be before Jan 25: ${query}`);
});

test('before: is after endDate (inclusive buffer)', () => {
  const query = buildGmailQuery({ preset: 'custom', startDate: '2024-01-25T12:00:00Z', endDate: '2024-02-15T12:00:00Z' });
  assert(query.includes('before:2024/2/16') || query.includes('before:2024/2/17'), `before: should be after Feb 15: ${query}`);
});

test('handles year boundary correctly', () => {
  const query = buildGmailQuery({ preset: 'custom', startDate: '2024-01-01T12:00:00Z', endDate: '2024-12-31T12:00:00Z' });
  assert(query.includes('after:2023/12/31') || query.includes('after:2023/12/30'), `after: should cross year: ${query}`);
  assert(query.includes('before:2025/1/1') || query.includes('before:2025/1/2'), `before: should cross year: ${query}`);
});

// ─── JSON Parsing (AI response simulation) ───
console.log('\n\x1b[1mAI Response Parsing\x1b[0m');

test('parses valid transaction JSON', () => {
  const raw = '{"sender":"Jean Dupont","amount":250.00,"currency":"CAD","reference":"CA1b2c3d","message":"Dime mars","recipient_email":"montreal.finances@iccameriques.org","date":"2025-02-15T14:30:00Z","status":"deposited"}';
  const parsed = JSON.parse(raw);
  assertEqual(parsed.sender, 'Jean Dupont');
  assertEqual(parsed.amount, 250.00);
  assertEqual(parsed.status, 'deposited');
});

test('strips markdown fences from AI response', () => {
  const raw = '```json\n{"sender":"Test","amount":100}\n```';
  const cleaned = raw.replace(/```json\s*/g, '').replace(/```\s*/g, '').trim();
  const parsed = JSON.parse(cleaned);
  assertEqual(parsed.sender, 'Test');
});

test('handles null fields gracefully', () => {
  const raw = '{"sender":"X","amount":50,"currency":"CAD","reference":null,"message":null,"recipient_email":null,"date":"2025-01-01","status":"pending"}';
  const parsed = JSON.parse(raw);
  assert(parsed.reference === null, 'reference should be null');
  assert(parsed.message === null, 'message should be null');
});

test('rejects invalid JSON', () => {
  let threw = false;
  try {
    JSON.parse('this is not json {broken}');
  } catch {
    threw = true;
  }
  assert(threw, 'Should throw on invalid JSON');
});

// ─── EDGE CASES ───
console.log('\n\x1b[1mEdge Cases\x1b[0m');

test('amount 0.01 (smallest valid amount)', () => {
  const parsed = JSON.parse('{"sender":"X","amount":0.01}');
  assert(parsed.amount > 0, 'Amount should be positive');
});

test('large amount (99999.99)', () => {
  const parsed = JSON.parse('{"sender":"X","amount":99999.99}');
  assertEqual(parsed.amount, 99999.99);
});

test('French characters in sender name', () => {
  const parsed = JSON.parse('{"sender":"Éric Bélanger-Côté","amount":100}');
  assertEqual(parsed.sender, 'Éric Bélanger-Côté');
});

test('Special characters in message field', () => {
  const parsed = JSON.parse('{"sender":"X","amount":100,"message":"Dîme pour l\'église — mars 2025"}');
  assert(parsed.message.includes("l'église"), 'Should preserve apostrophe');
});

// ═══ SUMMARY ═══
console.log('\n' + '═'.repeat(50));
console.log(`\x1b[1m📋 Results: ${passed} passed, ${failed} failed\x1b[0m`);
console.log('═'.repeat(50) + '\n');
process.exit(failed > 0 ? 1 : 0);