/**
 * Backup integration tests.
 * Covers BACKUP-001 to BACKUP-008.
 *
 * Note: createBackup() is async and creates real files.
 *       These tests run in test env and may not have a full DB file to zip,
 *       but the service should handle gracefully.
 */
import { describe, it, expect, vi, beforeAll, beforeEach, afterAll } from 'vitest';
import request from 'supertest';
import type { Application } from 'express';
import type { INestApplication } from '@nestjs/common';

const { testDb, dbMock } = vi.hoisted(() => {
  const Database = require('better-sqlite3');
  const db = new Database(':memory:');
  db.exec('PRAGMA journal_mode = WAL');
  db.exec('PRAGMA foreign_keys = ON');
  db.exec('PRAGMA busy_timeout = 5000');
  const mock = {
    db,
    closeDb: () => {},
    reinitialize: () => {},
    getPlaceWithTags: (placeId: number) => {
      const place: any = db.prepare(`SELECT p.*, c.name as category_name, c.color as category_color, c.icon as category_icon FROM places p LEFT JOIN categories c ON p.category_id = c.id WHERE p.id = ?`).get(placeId);
      if (!place) return null;
      const tags = db.prepare(`SELECT t.* FROM tags t JOIN place_tags pt ON t.id = pt.tag_id WHERE pt.place_id = ?`).all(placeId);
      return { ...place, category: place.category_id ? { id: place.category_id, name: place.category_name, color: place.category_color, icon: place.category_icon } : null, tags };
    },
    canAccessTrip: (tripId: any, userId: number) =>
      db.prepare(`SELECT t.id, t.user_id FROM trips t LEFT JOIN trip_members m ON m.trip_id = t.id AND m.user_id = ? WHERE t.id = ? AND (t.user_id = ? OR m.user_id IS NOT NULL)`).get(userId, tripId, userId),
    isOwner: (tripId: any, userId: number) =>
      !!db.prepare('SELECT id FROM trips WHERE id = ? AND user_id = ?').get(tripId, userId),
  };
  return { testDb: db, dbMock: mock };
});

vi.mock('../../src/db/database', () => dbMock);
vi.mock('../../src/config', () => ({
  JWT_SECRET: 'test-jwt-secret-for-trek-testing-only',
  ENCRYPTION_KEY: 'a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2',
  updateJwtSecret: () => {},
  SESSION_DURATION: '24h',
  SESSION_DURATION_MS: 86400000,
  SESSION_DURATION_SECONDS: 86400,
  DEFAULT_LANGUAGE: 'en',
}));
vi.mock('../../src/websocket', () => ({ broadcast: vi.fn(), broadcastToUser: vi.fn() }));

// Mock filesystem-dependent service functions to avoid real disk I/O in tests
vi.mock('../../src/services/backupService', async () => {
  const actual = await vi.importActual<typeof import('../../src/services/backupService')>('../../src/services/backupService');
  return {
    ...actual,
    createBackup: vi.fn().mockResolvedValue({
      filename: 'backup-2026-04-03T06-00-00.zip',
      size: 1024,
      sizeText: '1.0 KB',
      created_at: new Date().toISOString(),
    }),
    updateAutoSettings: vi.fn().mockReturnValue({
      enabled: false,
      interval: 'daily',
      keep_days: 7,
      hour: 2,
      day_of_week: 0,
      day_of_month: 1,
    }),
    restoreFromZip: vi.fn().mockResolvedValue({ success: true }),
    deleteBackup: vi.fn().mockReturnValue(undefined),
    backupFileExists: vi.fn().mockReturnValue(false),
    backupFilePath: vi.fn().mockReturnValue('/tmp/test-backup.zip'),
    // Keep checkRateLimit from actual so rate-limit tests work correctly
    checkRateLimit: vi.fn().mockReturnValue(true),
  };
});

import { buildApp } from '../../src/bootstrap';
import { createTables } from '../../src/db/schema';
import { runMigrations } from '../../src/db/migrations';
import { resetTestDb, resetRateLimits } from '../helpers/test-db';
import { createAdmin, createUser } from '../helpers/factories';
import { authCookie } from '../helpers/auth';
import * as backupService from '../../src/services/backupService';
import fs from 'fs';
import path from 'path';
import os from 'os';

let nestApp: INestApplication;
let app: Application;

beforeAll(async () => {
  createTables(testDb);
  runMigrations(testDb);
  nestApp = await buildApp();
  app = nestApp.getHttpAdapter().getInstance();
});

beforeEach(() => {
  resetTestDb(testDb);
  resetRateLimits(nestApp);
});

afterAll(async () => {
  await nestApp.close();
  testDb.close();
});

describe('Backup access control', () => {
  it('non-admin cannot access backup routes', async () => {
    const { user } = createUser(testDb);

    const res = await request(app)
      .get('/api/backup/list')
      .set('Cookie', authCookie(user.id));
    expect(res.status).toBe(403);
  });
});

describe('Backup list', () => {
  it('BACKUP-001 — GET /backup/list returns backups array', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .get('/api/backup/list')
      .set('Cookie', authCookie(admin.id));
    expect(res.status).toBe(200);
    expect(Array.isArray(res.body.backups)).toBe(true);
  });
});

describe('Backup creation', () => {
  it('BACKUP-001 — POST /backup/create creates a backup', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .post('/api/backup/create')
      .set('Cookie', authCookie(admin.id));
    expect(res.status).toBe(200);
    expect(res.body.success).toBe(true);
    expect(res.body.backup).toHaveProperty('filename');
    expect(res.body.backup).toHaveProperty('size');
  });
});

describe('Auto-backup settings', () => {
  it('BACKUP-008 — GET /backup/auto-settings returns current config', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .get('/api/backup/auto-settings')
      .set('Cookie', authCookie(admin.id));
    expect(res.status).toBe(200);
    expect(res.body).toHaveProperty('settings');
    expect(res.body.settings).toHaveProperty('enabled');
  });

  it('BACKUP-008 — PUT /backup/auto-settings updates settings', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .put('/api/backup/auto-settings')
      .set('Cookie', authCookie(admin.id))
      .send({ enabled: false, interval: 'daily', keep_days: 7 });
    expect(res.status).toBe(200);
    expect(res.body).toHaveProperty('settings');
    expect(res.body.settings).toHaveProperty('enabled');
    expect(res.body.settings).toHaveProperty('interval');
  });
});

describe('Backup security', () => {
  it('BACKUP-007 — Download with path traversal filename is rejected', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .get('/api/backup/download/../../etc/passwd')
      .set('Cookie', authCookie(admin.id));
    // Express normalises the URL before routing; path traversal gets resolved
    // to a path that matches no route → 404
    expect(res.status).toBe(404);
  });

  it('BACKUP-007 — Delete with path traversal filename is rejected', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .delete('/api/backup/../../../etc/passwd')
      .set('Cookie', authCookie(admin.id));
    // Express normalises the URL, stripping traversal → no route match → 404
    expect(res.status).toBe(404);
  });
});

// ---------------------------------------------------------------------------
// Download
// ---------------------------------------------------------------------------

describe('Backup download', () => {
  let tmpFile: string;

  beforeEach(() => {
    // Create a real temporary file that Express can stream back
    tmpFile = path.join(os.tmpdir(), `test-backup-${Date.now()}.zip`);
    fs.writeFileSync(tmpFile, 'fake zip content');
    vi.mocked(backupService.backupFileExists).mockReturnValue(true);
    vi.mocked(backupService.backupFilePath).mockReturnValue(tmpFile);
  });

  afterAll(() => {
    try { fs.unlinkSync(tmpFile); } catch {}
  });

  it('BACKUP-INT-001 — GET /backup/download/:filename returns 200 with content-disposition', async () => {
    const { user: admin } = createAdmin(testDb);
    const filename = 'backup-2026-04-06T12-00-00.zip';

    const res = await request(app)
      .get(`/api/backup/download/${filename}`)
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(200);
    expect(res.headers['content-disposition']).toMatch(/attachment/i);
    expect(res.headers['content-disposition']).toContain(filename);
  });

  it('BACKUP-INT-002 — GET /backup/download/:filename returns 400 for invalid filename', async () => {
    const { user: admin } = createAdmin(testDb);
    vi.mocked(backupService.backupFileExists).mockReturnValue(false);

    const res = await request(app)
      .get('/api/backup/download/not-a-valid-name.tar.gz')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/invalid filename/i);
  });

  it('BACKUP-INT-003 — GET /backup/download/:filename returns 404 when file not found', async () => {
    const { user: admin } = createAdmin(testDb);
    vi.mocked(backupService.backupFileExists).mockReturnValue(false);

    const res = await request(app)
      .get('/api/backup/download/backup-2026-04-06T12-00-00.zip')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(404);
    expect(res.body.error).toMatch(/not found/i);
  });
});

// ---------------------------------------------------------------------------
// Restore from existing backup
// ---------------------------------------------------------------------------

describe('Backup restore', () => {
  it('BACKUP-INT-004 — POST /backup/restore/:filename returns 200 on success', async () => {
    const { user: admin } = createAdmin(testDb);
    const filename = 'backup-2026-04-06T12-00-00.zip';

    vi.mocked(backupService.backupFileExists).mockReturnValue(true);
    vi.mocked(backupService.restoreFromZip).mockResolvedValue({ success: true });

    const res = await request(app)
      .post(`/api/backup/restore/${filename}`)
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(200);
    expect(res.body.success).toBe(true);
  });

  it('BACKUP-INT-005 — POST /backup/restore/:filename returns 404 when backup not found', async () => {
    const { user: admin } = createAdmin(testDb);

    vi.mocked(backupService.backupFileExists).mockReturnValue(false);

    const res = await request(app)
      .post('/api/backup/restore/backup-2026-04-06T12-00-00.zip')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(404);
    expect(res.body.error).toMatch(/not found/i);
  });

  it('BACKUP-INT-006 — POST /backup/restore/:filename returns 400 for invalid filename', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .post('/api/backup/restore/../../evil.zip')
      .set('Cookie', authCookie(admin.id));

    // Express resolves path traversal → no route or invalid filename check
    expect([400, 404]).toContain(res.status);
  });

  it('BACKUP-INT-007 — POST /backup/restore/:filename returns 400 when restoreFromZip reports failure', async () => {
    const { user: admin } = createAdmin(testDb);
    const filename = 'backup-2026-04-06T12-00-00.zip';

    vi.mocked(backupService.backupFileExists).mockReturnValue(true);
    vi.mocked(backupService.restoreFromZip).mockResolvedValue({
      success: false,
      error: 'Invalid backup: travel.db not found',
      status: 400,
    });

    const res = await request(app)
      .post(`/api/backup/restore/${filename}`)
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/travel\.db not found/i);
  });
});

// ---------------------------------------------------------------------------
// Delete backup
// ---------------------------------------------------------------------------

describe('Backup delete', () => {
  it('BACKUP-INT-008 — DELETE /backup/:filename returns 200 on success', async () => {
    const { user: admin } = createAdmin(testDb);
    const filename = 'backup-2026-04-06T12-00-00.zip';

    vi.mocked(backupService.backupFileExists).mockReturnValue(true);
    vi.mocked(backupService.deleteBackup).mockReturnValue(undefined);

    const res = await request(app)
      .delete(`/api/backup/${filename}`)
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(200);
    expect(res.body.success).toBe(true);
    expect(vi.mocked(backupService.deleteBackup)).toHaveBeenCalledWith(filename);
  });

  it('BACKUP-INT-009 — DELETE /backup/:filename returns 404 when not found', async () => {
    const { user: admin } = createAdmin(testDb);

    vi.mocked(backupService.backupFileExists).mockReturnValue(false);

    const res = await request(app)
      .delete('/api/backup/backup-2026-04-06T12-00-00.zip')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(404);
    expect(res.body.error).toMatch(/not found/i);
  });

  it('BACKUP-INT-010 — DELETE /backup/:filename returns 400 for invalid filename', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .delete('/api/backup/not-a-backup.tar.gz')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/invalid filename/i);
  });
});

// ---------------------------------------------------------------------------
// Rate limiter on POST /create
// ---------------------------------------------------------------------------

describe('Backup rate limiter', () => {
  it('BACKUP-INT-011 — POST /backup/create returns 429 after 3 requests', async () => {
    const { user: admin } = createAdmin(testDb);

    // Allow first 3 calls, then block
    let callCount = 0;
    vi.mocked(backupService.checkRateLimit).mockImplementation(() => {
      callCount++;
      return callCount <= 3;
    });

    // First 3 succeed
    for (let i = 0; i < 3; i++) {
      const res = await request(app)
        .post('/api/backup/create')
        .set('Cookie', authCookie(admin.id));
      expect(res.status).toBe(200);
    }

    // 4th is rate-limited
    const res = await request(app)
      .post('/api/backup/create')
      .set('Cookie', authCookie(admin.id));
    expect(res.status).toBe(429);
    expect(res.body.error).toMatch(/too many/i);
  });
});

// ---------------------------------------------------------------------------
// Upload-restore
// ---------------------------------------------------------------------------

describe('Backup upload-restore', () => {
  it('BACKUP-INT-012 — POST /backup/upload-restore with zip file returns 200', async () => {
    const { user: admin } = createAdmin(testDb);

    vi.mocked(backupService.restoreFromZip).mockResolvedValue({ success: true });

    // Create a minimal fake zip buffer (just needs to pass multer's file filter)
    const fakeZipBuffer = Buffer.from('PK\x03\x04'); // ZIP magic bytes

    const res = await request(app)
      .post('/api/backup/upload-restore')
      .set('Cookie', authCookie(admin.id))
      .attach('backup', fakeZipBuffer, { filename: 'test-restore.zip', contentType: 'application/zip' });

    expect(res.status).toBe(200);
    expect(res.body.success).toBe(true);
    expect(vi.mocked(backupService.restoreFromZip)).toHaveBeenCalled();
  });

  it('BACKUP-INT-013 — POST /backup/upload-restore with no file returns 400', async () => {
    const { user: admin } = createAdmin(testDb);

    const res = await request(app)
      .post('/api/backup/upload-restore')
      .set('Cookie', authCookie(admin.id));

    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/no file/i);
  });

  it('BACKUP-INT-014 — POST /backup/upload-restore returns 400 when restore fails', async () => {
    const { user: admin } = createAdmin(testDb);

    vi.mocked(backupService.restoreFromZip).mockResolvedValue({
      success: false,
      error: 'Uploaded file is not a valid SQLite database',
      status: 400,
    });

    const fakeZipBuffer = Buffer.from('PK\x03\x04');

    const res = await request(app)
      .post('/api/backup/upload-restore')
      .set('Cookie', authCookie(admin.id))
      .attach('backup', fakeZipBuffer, { filename: 'bad-restore.zip', contentType: 'application/zip' });

    expect(res.status).toBe(400);
    expect(res.body.error).toMatch(/not a valid SQLite/i);
  });
});