const IS_EE = require('./config/helpers/is_ee_env');
const isESLint = require('./config/helpers/is_eslint');
const IS_JH = require('./config/helpers/is_jh_env');

const { VUE_VERSION: EXPLICIT_VUE_VERSION } = process.env;
if (![undefined, '2', '3'].includes(EXPLICIT_VUE_VERSION)) {
  throw new Error(
    `Invalid VUE_VERSION value: ${EXPLICIT_VUE_VERSION}. Only '2' and '3' are supported`,
  );
}
const USE_VUE_3 = EXPLICIT_VUE_VERSION === '3';

const { TEST_HOST } = require('./spec/frontend/__helpers__/test_constants');

module.exports = (path, options = {}) => {
  const {
    moduleNameMapper: extModuleNameMapper = {},
    moduleNameMapperEE: extModuleNameMapperEE = {},
    moduleNameMapperJH: extModuleNameMapperJH = {},
    roots: extRoots = [],
    rootsEE: extRootsEE = [],
    rootsJH: extRootsJH = [],
  } = options;

  const reporters = ['default'];
  const VUE_JEST_TRANSFORMER = USE_VUE_3 ? '@vue/vue3-jest' : '@vue/vue2-jest';
  const setupFilesAfterEnv = [`<rootDir>/${path}/test_setup.js`, 'jest-canvas-mock'];
  const vueModuleNameMappers = {};
  const globals = {};

  if (EXPLICIT_VUE_VERSION) {
    Object.assign(vueModuleNameMappers, {
      '^@gitlab/ui/dist/([^.]*)$': [
        '<rootDir>/node_modules/@gitlab/ui/src/$1.vue',
        '<rootDir>/node_modules/@gitlab/ui/src/$1.js',
        '<rootDir>/node_modules/@gitlab/ui/dist/$1.js',
      ],
      '^@gitlab/ui$': '<rootDir>/node_modules/@gitlab/ui/src/index.js',
    });
  }

  if (USE_VUE_3) {
    setupFilesAfterEnv.unshift('<rootDir>/spec/frontend/vue_compat_test_setup.js');
    Object.assign(vueModuleNameMappers, {
      '^vue$': '@vue/compat',
      '^@vue/test-utils$': '@vue/test-utils-vue3',

      // Library wrappers
      '^vuex$': '<rootDir>/app/assets/javascripts/lib/utils/vue3compat/vuex.js',
      '^vue-apollo$': '<rootDir>/app/assets/javascripts/lib/utils/vue3compat/vue_apollo.js',
      '^vue-router$': '<rootDir>/app/assets/javascripts/lib/utils/vue3compat/vue_router.js',
    });
    Object.assign(globals, {
      'vue-jest': {
        experimentalCSSCompile: false,
        compiler: require.resolve('./config/vue3migration/compiler'),
        compilerOptions: {
          whitespace: 'preserve',
          compatConfig: {
            MODE: 2,
          },
        },
      },
    });
  }

  // To have consistent date time parsing both in local and CI environments we set
  // the timezone of the Node process. https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/27738
  process.env.TZ = 'GMT';

  if (process.env.CI) {
    reporters.push([
      'jest-junit',
      {
        outputName: './junit_jest.xml',
        addFileAttribute: 'true',
      },
    ]);
  }

  const glob = `${path}/**/*@([._])spec.js`;
  let testMatch = [`<rootDir>/${glob}`];
  if (IS_EE) {
    testMatch.push(`<rootDir>/ee/${glob}`);
  }

  if (IS_JH) {
    testMatch.push(`<rootDir>/jh/${glob}`);
  }
  // workaround for eslint-import-resolver-jest only resolving in test files
  // see https://github.com/JoinColony/eslint-import-resolver-jest#note
  if (isESLint(module)) {
    testMatch = testMatch.map((modulePath) => modulePath.replace('_spec.js', ''));
  }

  const TEST_FIXTURES_PATTERN = 'test_fixtures(/.*)$';
  const TEST_FIXTURES_HOME = '/tmp/tests/frontend/fixtures';
  const TEST_FIXTURES_HOME_EE = '/tmp/tests/frontend/fixtures-ee';
  const TEST_FIXTURES_STATIC_HOME = '/spec/frontend/fixtures/static';
  const TEST_FIXTURES_RAW_LOADER_PATTERN = `(${TEST_FIXTURES_HOME}|${TEST_FIXTURES_STATIC_HOME}).*\\.html$`;

  const moduleNameMapper = {
    [TEST_FIXTURES_PATTERN]: `<rootDir>${TEST_FIXTURES_HOME}$1`,
    '^test_fixtures_static(/.*)$': `<rootDir>${TEST_FIXTURES_STATIC_HOME}$1`,
    '\\.(svg|gif|png|mp4)(\\?\\w+)?$': '<rootDir>/spec/frontend/__mocks__/file_mock.js',
    '\\.css$': '<rootDir>/spec/frontend/__mocks__/file_mock.js',
    '^~(/.*)\\?(worker|raw)$': '<rootDir>/app/assets/javascripts$1',
    '^(.*)\\?(worker|raw)$': '$1',
    '^~(/.*)$': '<rootDir>/app/assets/javascripts$1',
    '^ee_component(/.*)$':
      '<rootDir>/app/assets/javascripts/vue_shared/components/empty_component.js',
    '^jh_component(/.*)$':
      '<rootDir>/app/assets/javascripts/vue_shared/components/empty_component.js',
    '^shared_queries(/.*)$': '<rootDir>/app/graphql/queries$1',
    '^ee_else_ce(/.*)$': '<rootDir>/app/assets/javascripts$1',
    '^jh_else_ce(/.*)$': '<rootDir>/app/assets/javascripts$1',
    '^any_else_ce(/.*)$': '<rootDir>/app/assets/javascripts$1',
    '^helpers(/.*)$': '<rootDir>/spec/frontend/__helpers__$1',
    '^vendor(/.*)$': '<rootDir>/vendor/assets/javascripts$1',
    '^public(/.*)$': '<rootDir>/public$1',
    'emojis(/.*).json': '<rootDir>/fixtures/emojis$1.json',
    '^spec/test_constants$': '<rootDir>/spec/frontend/__helpers__/test_constants',
    '^jest/(.*)$': '<rootDir>/spec/frontend/$1',
    '^ee_else_ce_jest/(.*)$': '<rootDir>/spec/frontend/$1',
    '^jquery$': '<rootDir>/node_modules/jquery/dist/jquery.slim.js',
    '^dexie$': '<rootDir>/node_modules/dexie/dist/dexie.min.js',
    ...extModuleNameMapper,
    ...vueModuleNameMappers,
  };

  const collectCoverageFrom = ['<rootDir>/app/assets/javascripts/**/*.{js,vue}'];

  if (IS_EE) {
    const rootDirEE = '<rootDir>/ee/app/assets/javascripts$1';
    const specDirEE = '<rootDir>/ee/spec/frontend/$1';
    Object.assign(moduleNameMapper, {
      '^ee(/.*)$': rootDirEE,
      '^ee_component(/.*)$': rootDirEE,
      '^ee_else_ce(/.*)$': rootDirEE,
      '^ee_jest/(.*)$': specDirEE,
      '^ee_else_ce_jest/(.*)$': specDirEE,
      '^any_else_ce(/.*)$': rootDirEE,
      '^jh_else_ee(/.*)$': rootDirEE,
      [TEST_FIXTURES_PATTERN]: `<rootDir>${TEST_FIXTURES_HOME_EE}$1`,
      ...extModuleNameMapperEE,
    });

    collectCoverageFrom.push(rootDirEE.replace('$1', '/**/*.{js,vue}'));
  }

  if (IS_JH) {
    // DO NOT add additional path to Jihu side, it might break things.
    const rootDirJH = '<rootDir>/jh/app/assets/javascripts$1';
    const specDirJH = '<rootDir>/jh/spec/frontend/$1';
    Object.assign(moduleNameMapper, {
      '^jh(/.*)$': rootDirJH,
      '^jh_component(/.*)$': rootDirJH,
      '^jh_jest/(.*)$': specDirJH,
      // jh path alias https://gitlab.com/gitlab-org/gitlab/-/merge_requests/74305#note_732793956
      '^jh_else_ce(/.*)$': rootDirJH,
      '^jh_else_ee(/.*)$': rootDirJH,
      '^any_else_ce(/.*)$': rootDirJH,
      ...extModuleNameMapperJH,
    });

    collectCoverageFrom.push(rootDirJH.replace('$1', '/**/*.{js,vue}'));
  }

  const coverageDirectory = () => {
    if (process.env.CI_NODE_INDEX && process.env.CI_NODE_TOTAL) {
      return `<rootDir>/coverage-frontend/jest-${process.env.CI_NODE_INDEX}-${process.env.CI_NODE_TOTAL}`;
    }

    return '<rootDir>/coverage-frontend/';
  };

  const gfmParserDependencies = [
    'rehype-.*',
    'remark-.*',
    'hast*',
    'unist.*',
    'markdown-table',
    'mdast-util-.*',
    'micromark.*',
    'vfile.*',
    'bail',
    'trough',
    'unified',
    'is-plain-obj',
    'decode-named-character-reference',
    'character-entities*',
    'property-information',
    'space-separated-tokens',
    'comma-separated-tokens',
    'web-namespaces',
    'zwitch',
    'html-void-elements',
    'ccount',
    'escape-string-regexp',
  ];

  const transformIgnoreNodeModules = [
    'vue-test-utils-compat',
    '@gitlab/ui',
    '@gitlab/favicon-overlay',
    '@gitlab/cluster-client',
    '@gitlab/web-ide',
    'bootstrap-vue',
    'gridstack',
    'three',
    'monaco-editor',
    'monaco-yaml',
    'monaco-marker-data-provider',
    'monaco-worker-manager',
    'fast-mersenne-twister',
    'prosemirror-markdown',
    'marked',
    'fault',
    'dateformat',
    'lowlight',
    'vscode-languageserver-types',
    'yaml',
    'dexie',
    ...gfmParserDependencies,
  ];

  return {
    globals,
    clearMocks: true,
    testMatch,
    moduleFileExtensions: ['js', 'json', 'vue', 'gql', 'graphql', 'yaml', 'yml', 'html'],
    moduleNameMapper,
    collectCoverageFrom,
    coverageDirectory: coverageDirectory(),
    coverageReporters: ['json', 'lcov', 'text-summary', 'clover'],
    coveragePathIgnorePatterns: [
      '<rootDir>/node_modules/',
      // We need ignore _worker code coverage since we are manually transforming it
      '_worker\\.js$',
      // we're using import.meta in main entrypoint with Vite which confuses Babel, so we just ignore it
      '<rootDir>/app/assets/javascripts/entrypoints/main',
    ],
    cacheDirectory: '<rootDir>/tmp/cache/jest',
    modulePathIgnorePatterns: ['<rootDir>/.yarn-cache/'],
    reporters,
    resolver: './jest_resolver.js',
    setupFilesAfterEnv,
    restoreMocks: true,
    // actual test timeouts
    testTimeout: process.env.CI ? 10000 : 5000,
    transform: {
      '^.+\\.(gql|graphql)$': './spec/frontend/__helpers__/graphql_transformer.js',
      '^.+_worker\\.js$': './spec/frontend/__helpers__/web_worker_transformer.js',
      '^.+\\.js$': 'babel-jest',
      '^.+\\.vue$': VUE_JEST_TRANSFORMER,
      'spec/frontend/editor/schema/ci/yaml_tests/.+\\.(yml|yaml)$':
        './spec/frontend/__helpers__/yaml_transformer.js',
      '^.+\\.(md|zip|png|yml|yaml|sh|ps1)$': './spec/frontend/__helpers__/raw_transformer.js',
      [TEST_FIXTURES_RAW_LOADER_PATTERN]: './spec/frontend/__helpers__/raw_transformer.js',
    },
    transformIgnorePatterns: [`node_modules/(?!(${transformIgnoreNodeModules.join('|')}))`],
    fakeTimers: {
      enableGlobally: true,
      doNotFake: ['nextTick', 'setImmediate'],
      legacyFakeTimers: true,
    },
    testEnvironment: '<rootDir>/spec/frontend/environment.js',
    testEnvironmentOptions: {
      IS_EE,
      IS_JH,
      url: TEST_HOST,
    },
    testRunner: 'jest-jasmine2',
    snapshotSerializers: [
      '<rootDir>/spec/frontend/__helpers__/html_string_serializer.js',
      '<rootDir>/spec/frontend/__helpers__/clean_html_element_serializer.js',
    ],
    roots: [
      '<rootDir>/app/assets/javascripts/',
      ...extRoots,
      ...(IS_EE ? ['<rootDir>/ee/app/assets/javascripts/', ...extRootsEE] : []),
      ...(IS_JH ? ['<rootDir>/jh/app/assets/javascripts/', ...extRootsJH] : []),
    ],
    /*
    Reduce the amount of max workers in development mode.
    If we use all available cores, on machines with efficiency cores, we actually will be slower

    Set nothing for CI, because we want to use the auto-logic for the cores
     */
    maxWorkers: process.env.CI ? '' : '60%',
  };
};