/*
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example;

import static com.google.common.truth.Truth.assertThat;

import com.google.cloud.kms.v1.CryptoKey;
import com.google.cloud.kms.v1.CryptoKeyVersion;
import com.google.cloud.kms.v1.KeyRing;

import java.util.List;
import java.util.UUID;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Integration (system) tests for {@link Quickstart}.
 */
@RunWith(JUnit4.class)
@SuppressWarnings("checkstyle:abbreviationaswordinname")
public class CryptFileIT {

  private static final String PROJECT_ID = System.getenv("GOOGLE_CLOUD_PROJECT");
  private static final String LOCATION_ID = "global";
  private static final String KEY_RING_ID = "test-key-ring-" + UUID.randomUUID().toString();
  private static final String CRYPTO_KEY_ID = UUID.randomUUID().toString();
  private static final String ENCRYPT_STRING = 
      "Everyone shall sit under their own vine and fig tree";

  /**
   * Creates a CryptoKey for use during this test run.
   */
  @BeforeClass
  public static void setUpClass() throws Exception {
    KeyRing keyRing = Snippets.createKeyRing(PROJECT_ID, LOCATION_ID, KEY_RING_ID);
    assertThat(keyRing.getName()).contains("keyRings/" + KEY_RING_ID);

    CryptoKey cryptoKey = 
        Snippets.createCryptoKey(PROJECT_ID, LOCATION_ID, KEY_RING_ID, CRYPTO_KEY_ID);
    assertThat(cryptoKey.getName()).contains(String.format(
        "keyRings/%s/cryptoKeys/%s", KEY_RING_ID, CRYPTO_KEY_ID));
  }

  /**
   * Destroys all the key versions created during this test run.
   */
  @AfterClass
  public static void tearDownClass() throws Exception {
    List<CryptoKeyVersion> versions = 
        Snippets.listCryptoKeyVersions(PROJECT_ID, LOCATION_ID, KEY_RING_ID, CRYPTO_KEY_ID);

    for (CryptoKeyVersion version : versions) {
      if (!version.getState().equals(CryptoKeyVersion.CryptoKeyVersionState.DESTROY_SCHEDULED)) {
        Snippets.destroyCryptoKeyVersion(
            PROJECT_ID, LOCATION_ID, KEY_RING_ID, CRYPTO_KEY_ID,
            SnippetsIT.parseVersionId(version.getName()));
      }
    }
  }

  @Test
  public void encryptDecrypt_encryptsAndDecrypts() throws Exception {
    // Encrypt ENCRYPT_STRING with the current primary version.
    byte[] ciphertext = CryptFile.encrypt(
        PROJECT_ID, LOCATION_ID, KEY_RING_ID, CRYPTO_KEY_ID, ENCRYPT_STRING.getBytes());

    assertThat(new String(ciphertext)).isNotEqualTo(ENCRYPT_STRING);

    byte[] plaintext = CryptFile.decrypt(
        PROJECT_ID, LOCATION_ID, KEY_RING_ID, CRYPTO_KEY_ID, ciphertext);

    assertThat(new String(plaintext)).isEqualTo(ENCRYPT_STRING);
  }
}