import type { NxJsonConfiguration, Tree } from '@nrwl/devkit';
import {
  generateFiles,
  getProjects,
  joinPathFragments,
  readJson,
  readNxJson,
  updateJson,
  updateNxJson,
  writeJson,
} from '@nrwl/devkit';
import { Linter, lintInitGenerator } from '@nrwl/linter';
import {
  getRootTsConfigPathInTree,
  initGenerator as jsInitGenerator,
} from '@nrwl/js';
import { deduceDefaultBase } from 'nx/src/utils/default-base';
import { prettierVersion } from '@nrwl/js/src/utils/versions';
import { toNewFormat } from 'nx/src/adapter/angular-json';
import { angularDevkitVersion, nxVersion } from '../../../utils/versions';
import type { ProjectMigrator } from '../migrators';
import type { GeneratorOptions } from '../schema';
import type { WorkspaceRootFileTypesInfo } from './types';

export function validateWorkspace(tree: Tree): void {
  const errors: string[] = [];
  if (!tree.exists('package.json')) {
    errors.push('The "package.json" file could not be found.');
  }
  if (!tree.exists('angular.json')) {
    errors.push('The "angular.json" file could not be found.');
  }

  if (!errors.length) {
    return;
  }

  throw new Error(`The workspace cannot be migrated because of the following issues:

  - ${errors.join('\n  ')}`);
}

export function createNxJson(
  tree: Tree,
  options: GeneratorOptions,
  defaultProject: string | undefined
): void {
  const { npmScope } = options;

  const targets = getWorkspaceCommonTargets(tree);

  writeJson<NxJsonConfiguration>(tree, 'nx.json', {
    ...(npmScope ? { npmScope } : {}),
    affected: {
      defaultBase: options.defaultBase ?? deduceDefaultBase(),
    },
    tasksRunnerOptions: {
      default: {
        runner: 'nx/tasks-runners/default',
        options: {
          cacheableOperations: [
            'build',
            targets.test ? 'test' : undefined,
            targets.lint ? 'lint' : undefined,
            targets.e2e ? 'e2e' : undefined,
          ].filter(Boolean),
        },
      },
    },
    namedInputs: {
      sharedGlobals: [],
      default: ['{projectRoot}/**/*', 'sharedGlobals'],
      production: [
        'default',
        ...(targets.test
          ? [
              '!{projectRoot}/tsconfig.spec.json',
              '!{projectRoot}/**/*.spec.[jt]s',
              '!{projectRoot}/karma.conf.js',
            ]
          : []),
        targets.lint ? '!{projectRoot}/.eslintrc.json' : undefined,
      ].filter(Boolean),
    },
    targetDefaults: {
      build: {
        dependsOn: ['^build'],
        inputs: ['production', '^production'],
      },
      test: targets.test
        ? {
            inputs: ['default', '^production', '{workspaceRoot}/karma.conf.js'],
          }
        : undefined,
      lint: targets.lint
        ? {
            inputs: ['default', '{workspaceRoot}/.eslintrc.json'],
          }
        : undefined,
      e2e: targets.e2e
        ? {
            inputs: ['default', '^production'],
          }
        : undefined,
    },
    defaultProject,
  });
}

function getWorkspaceCommonTargets(tree: Tree): {
  e2e: boolean;
  lint: boolean;
  test: boolean;
} {
  const targets = { e2e: false, lint: false, test: false };
  const projects = getProjects(tree);

  for (const [, project] of projects) {
    if (!targets.e2e && project.targets?.e2e) {
      targets.e2e = true;
    }
    if (!targets.lint && project.targets?.lint) {
      targets.lint = true;
    }
    if (!targets.test && project.targets?.test) {
      targets.test = true;
    }

    if (targets.e2e && targets.lint && targets.test) {
      return targets;
    }
  }

  return targets;
}

export function updateWorkspaceConfigDefaults(tree: Tree): void {
  const nxJson = readNxJson(tree);
  delete (nxJson as any).newProjectRoot;
  if (nxJson.cli) {
    delete (nxJson as any).defaultCollection;
  }
  updateNxJson(tree, nxJson);
}

export function updateRootTsConfig(tree: Tree): void {
  const tsconfig = readJson(tree, getRootTsConfigPathInTree(tree));
  tsconfig.compilerOptions.paths ??= {};
  tsconfig.compilerOptions.baseUrl = '.';
  tsconfig.compilerOptions.rootDir = '.';
  tsconfig.exclude = Array.from(
    new Set([...(tsconfig.exclude ?? []), 'node_modules', 'tmp'])
  );
  writeJson(tree, 'tsconfig.base.json', tsconfig);

  if (tree.exists('tsconfig.json')) {
    tree.delete('tsconfig.json');
  }
}

export function updatePackageJson(tree: Tree): void {
  updateJson(tree, 'package.json', (packageJson) => {
    packageJson.scripts = packageJson.scripts ?? {};
    Object.keys(packageJson.scripts).forEach((script) => {
      packageJson.scripts[script] = packageJson.scripts[script]
        .replace(/^ng /, 'nx ')
        .replace(/ ng /, ' nx ');
    });

    packageJson.devDependencies = packageJson.devDependencies ?? {};
    packageJson.dependencies = packageJson.dependencies ?? {};
    if (!packageJson.devDependencies['@angular/cli']) {
      packageJson.devDependencies['@angular/cli'] = angularDevkitVersion;
    }
    if (!packageJson.devDependencies['@nrwl/workspace']) {
      packageJson.devDependencies['@nrwl/workspace'] = nxVersion;
    }
    if (!packageJson.devDependencies['nx']) {
      packageJson.devDependencies['nx'] = nxVersion;
    }
    if (!packageJson.devDependencies['prettier']) {
      packageJson.devDependencies['prettier'] = prettierVersion;
    }

    return packageJson;
  });
}

export function updateRootEsLintConfig(
  tree: Tree,
  existingEsLintConfig: any | undefined,
  unitTestRunner?: string
): void {
  if (tree.exists('.eslintrc.json')) {
    /**
     * If it still exists it means that there was no project at the root of the
     * workspace, so it was not moved. In that case, we remove the file so the
     * init generator do its work. We still receive the content of the file,
     * so we update it after the init generator has run.
     */
    tree.delete('.eslintrc.json');
  }

  lintInitGenerator(tree, { linter: Linter.EsLint, unitTestRunner });

  if (!existingEsLintConfig) {
    // There was no eslint config in the root, so we keep the generated one as-is.
    return;
  }

  existingEsLintConfig.ignorePatterns = ['**/*'];
  existingEsLintConfig.plugins = Array.from(
    new Set([...(existingEsLintConfig.plugins ?? []), '@nrwl/nx'])
  );
  existingEsLintConfig.overrides?.forEach((override) => {
    if (!override.parserOptions?.project) {
      return;
    }

    delete override.parserOptions.project;
  });
  // add the @nrwl/nx/enforce-module-boundaries rule
  existingEsLintConfig.overrides = [
    ...(existingEsLintConfig.overrides ?? []),
    {
      files: ['*.ts', '*.tsx', '*.js', '*.jsx'],
      rules: {
        '@nrwl/nx/enforce-module-boundaries': [
          'error',
          {
            enforceBuildableLibDependency: true,
            allow: [],
            depConstraints: [
              { sourceTag: '*', onlyDependOnLibsWithTags: ['*'] },
            ],
          },
        ],
      },
    },
  ];

  writeJson(tree, '.eslintrc.json', existingEsLintConfig);
}

export function cleanupEsLintPackages(tree: Tree): void {
  updateJson(tree, 'package.json', (json) => {
    if (json.devDependencies?.['@angular-eslint/builder']) {
      delete json.devDependencies['@angular-eslint/builder'];
    }
    if (json.dependencies?.['@angular-eslint/builder']) {
      delete json.dependencies['@angular-eslint/builder'];
    }
    if (json.devDependencies?.['@angular-eslint/schematics']) {
      delete json.devDependencies['@angular-eslint/schematics'];
    }
    if (json.dependencies?.['@angular-eslint/schematics']) {
      delete json.dependencies['@angular-eslint/schematics'];
    }

    return json;
  });
}

export async function createWorkspaceFiles(tree: Tree): Promise<void> {
  updateVsCodeRecommendedExtensions(tree);

  await jsInitGenerator(tree, {});

  generateFiles(tree, joinPathFragments(__dirname, '../files/root'), '.', {
    tmpl: '',
    dot: '.',
    rootTsConfigPath: getRootTsConfigPathInTree(tree),
  });
}

export function createRootKarmaConfig(tree: Tree): void {
  generateFiles(
    tree,
    joinPathFragments(__dirname, '../files/root-karma'),
    '.',
    {
      tmpl: '',
    }
  );
}

export function getWorkspaceRootFileTypesInfo(
  tree: Tree,
  migrators: ProjectMigrator[]
): WorkspaceRootFileTypesInfo {
  const workspaceRootFileTypesInfo: WorkspaceRootFileTypesInfo = {
    eslint: false,
    karma: false,
  };

  if (tree.exists('.eslintrc.json')) {
    workspaceRootFileTypesInfo.eslint = true;
  }
  if (tree.exists('karma.conf.js')) {
    workspaceRootFileTypesInfo.karma = true;
  }

  if (workspaceRootFileTypesInfo.eslint && workspaceRootFileTypesInfo.karma) {
    return workspaceRootFileTypesInfo;
  }

  for (const migrator of migrators) {
    const projectInfo = migrator.getWorkspaceRootFileTypesInfo();
    workspaceRootFileTypesInfo.eslint =
      workspaceRootFileTypesInfo.eslint || projectInfo.eslint;
    workspaceRootFileTypesInfo.karma =
      workspaceRootFileTypesInfo.karma || projectInfo.karma;

    if (workspaceRootFileTypesInfo.eslint && workspaceRootFileTypesInfo.karma) {
      return workspaceRootFileTypesInfo;
    }
  }

  return workspaceRootFileTypesInfo;
}

export function updateVsCodeRecommendedExtensions(tree: Tree): void {
  const recommendations = [
    'nrwl.angular-console',
    'angular.ng-template',
    'dbaeumer.vscode-eslint',
    'esbenp.prettier-vscode',
  ];
  if (tree.exists('.vscode/extensions.json')) {
    updateJson(
      tree,
      '.vscode/extensions.json',
      (json: { recommendations?: string[] }) => {
        json.recommendations = json.recommendations || [];
        recommendations.forEach((extension) => {
          if (!json.recommendations.includes(extension)) {
            json.recommendations.push(extension);
          }
        });

        return json;
      }
    );
  } else {
    writeJson(tree, '.vscode/extensions.json', {
      recommendations,
    });
  }
}

export function deleteAngularJson(tree: Tree): void {
  const projects = toNewFormat(readJson(tree, 'angular.json')).projects;
  if (!Object.keys(projects).length) {
    tree.delete('angular.json');
  }
}

export function deleteGitKeepFilesIfNotNeeded(tree: Tree): void {
  if (tree.children('apps').length > 1 && tree.exists('apps/.gitkeep')) {
    tree.delete('apps/.gitkeep');
  }
  if (tree.children('libs').length > 1 && tree.exists('libs/.gitkeep')) {
    tree.delete('libs/.gitkeep');
  }
}