import { Logger } from '@nestjs/common';
import type { Response } from 'express';
import { BackupController } from './backup.controller';
import { BackupService } from './backup.service';
import { BackupSchedulerService } from './backup-scheduler.service';
import { BackupSettingsService } from './backup-settings.service';
import { ReauthService } from '../auth/reauth/reauth.service';
import type { AuthenticatedUser } from '../auth/types/authenticated-user';

describe('BackupController', () => {
  const originalLimit = process.env.BACKUP_MAX_IMPORT_BYTES;
  let controller: BackupController;
  let backupService: { importFile: jest.Mock; exportSealed: jest.Mock };
  let scheduler: { reload: jest.Mock };
  let reauth: { verify: jest.Mock };
  const actor = { id: 'admin-1' } as AuthenticatedUser;
  const file = {
    buffer: Buffer.from(JSON.stringify({ format: 'apicore-backup' })),
  } as Express.Multer.File;

  beforeEach(() => {
    delete process.env.BACKUP_MAX_IMPORT_BYTES;
    backupService = {
      importFile: jest.fn().mockResolvedValue({ imported: {}, skipped: [] }),
      exportSealed: jest.fn().mockResolvedValue({
        format: 'apicore-backup',
        exportedAt: '2026-10-12T03:00:00.000Z',
        ciphertext: 'x'.repeat(2000),
      }),
    };
    scheduler = { reload: jest.fn().mockResolvedValue(undefined) };
    reauth = { verify: jest.fn().mockResolvedValue(undefined) };
    controller = new BackupController(
      backupService as unknown as BackupService,
      scheduler as unknown as BackupSchedulerService,
      {} as BackupSettingsService,
      reauth as unknown as ReauthService,
    );
  });

  afterEach(() => {
    if (originalLimit === undefined) {
      delete process.env.BACKUP_MAX_IMPORT_BYTES;
    } else {
      process.env.BACKUP_MAX_IMPORT_BYTES = originalLimit;
    }
  });

  it('re-registers the backup schedule after an import, since it may restore other backup settings', async () => {
    await controller.import(file, { password: 'secret' }, actor);

    expect(backupService.importFile).toHaveBeenCalledTimes(1);
    expect(scheduler.reload).toHaveBeenCalledTimes(1);
    expect(scheduler.reload.mock.invocationCallOrder[0]).toBeGreaterThan(
      backupService.importFile.mock.invocationCallOrder[0],
    );
  });

  it('leaves the schedule alone when the import fails', async () => {
    backupService.importFile.mockRejectedValue(new Error('broken file'));

    await expect(
      controller.import(file, { password: 'secret' }, actor),
    ).rejects.toThrow('broken file');
    expect(scheduler.reload).not.toHaveBeenCalled();
  });

  describe('export', () => {
    let warn: jest.SpyInstance;
    let res: { setHeader: jest.Mock; send: jest.Mock };

    beforeEach(() => {
      warn = jest.spyOn(Logger.prototype, 'warn').mockImplementation(() => {});
      res = { setHeader: jest.fn(), send: jest.fn() };
    });

    afterEach(() => {
      warn.mockRestore();
    });

    it('still delivers a backup larger than the import limit, but logs a warning', async () => {
      process.env.BACKUP_MAX_IMPORT_BYTES = '1000';

      await controller.export(res as unknown as Response);

      expect(res.send).toHaveBeenCalledTimes(1);
      expect(warn).toHaveBeenCalledTimes(1);
      expect(warn).toHaveBeenCalledWith(
        expect.stringContaining('Import-Limit'),
      );
    });

    it('logs nothing for a backup within the import limit', async () => {
      await controller.export(res as unknown as Response);

      expect(res.send).toHaveBeenCalledTimes(1);
      expect(warn).not.toHaveBeenCalled();
    });
  });
});