import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { EnvValidationError, parseEnv } from '../src/config/env.js';

describe('environment validation', () => {
  it('accepts a valid configuration', () => {
    const env = parseEnv({
      NODE_ENV: 'test',
      DATABASE_URL: 'mysql://user:pass@localhost:3306/novya_test',
      LOG_LEVEL: 'silent',
    });

    assert.equal(env.NODE_ENV, 'test');
    assert.equal(env.DATABASE_URL, 'mysql://user:pass@localhost:3306/novya_test');
    assert.equal(env.PORT, 3001);
    assert.equal(env.OPENAI_BASE_URL, 'https://api.gapgpt.app/v1');
    assert.equal(env.OPENAI_MODEL, 'gpt-4o-mini');
    assert.equal(env.OPENAI_API_KEY, '');
  });

  it('fails clearly when DATABASE_URL is missing', () => {
    assert.throws(
      () =>
        parseEnv({
          NODE_ENV: 'test',
        }),
      (err: unknown) => {
        assert.ok(err instanceof EnvValidationError);
        assert.match(String(err.message), /DATABASE_URL.*Required/i);
        return true;
      },
    );
  });

  it('fails clearly when DATABASE_URL is not MySQL', () => {
    assert.throws(
      () =>
        parseEnv({
          NODE_ENV: 'test',
          DATABASE_URL: 'postgres://user:pass@localhost/db',
        }),
      (err: unknown) => {
        assert.ok(err instanceof EnvValidationError);
        assert.match(String(err.message), /MySQL connection string/);
        return true;
      },
    );
  });
});