import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

import { afterEach, beforeEach, describe, expect, it } from 'vitest';

import { loadBackupEnv } from './config.js';

const DATABASE_URL = 'postgresql://dorfteich:pw@db:5432/dorfteich';

let dir: string;

beforeEach(async () => {
  dir = await mkdtemp(join(tmpdir(), 'dorfteich-backup-env-'));
});

afterEach(async () => {
  await rm(dir, { recursive: true, force: true });
});

describe('loadBackupEnv', () => {
  it('applies defaults and drops compose empty strings', () => {
    // Compose passes optional variables as "" — they must fall through to
    // the schema defaults, not fail enum/number parsing (issue #80 lesson).
    const env = loadBackupEnv({
      DATABASE_URL,
      BACKUP_TIME: '',
      BACKUP_RETENTION_DAYS: '',
      BACKUP_MAIL_LOCALE: '',
      SECRETS_FILE: join(dir, 'missing.env'),
    });
    expect(env.BACKUP_TIME).toBe('03:00');
    expect(env.BACKUP_RETENTION_DAYS).toBe(30);
    expect(env.BACKUP_MAIL_LOCALE).toBe('en');
  });

  it('fills SMTP settings from the wizard-written secret store', () => {
    const secretsFile = join(dir, 'secrets.env');
    return writeFile(secretsFile, 'SMTP_HOST="relay.example.com"\nSMTP_PORT="2525"\n').then(() => {
      const env = loadBackupEnv({
        DATABASE_URL,
        SECRETS_FILE: secretsFile,
        // Explicit container env must win over the store.
        SMTP_PORT: '465',
      });
      expect(env.SMTP_HOST).toBe('relay.example.com');
      expect(env.SMTP_PORT).toBe(465);
    });
  });

  it('rejects a malformed BACKUP_TIME', () => {
    expect(() => loadBackupEnv({ DATABASE_URL, BACKUP_TIME: '25:99' })).toThrow(
      /BACKUP_TIME.*HH:MM/s,
    );
  });
});