import { Rule, Tree } from '@angular-devkit/schematics';
import { Schema } from './schema';

export function ngAdd(_options: Schema): Rule {
  return addDeliveryVerificationScript;
}

function addDeliveryVerificationScript(tree: Tree): void {
  const packageJson = readJson(tree, '/package.json');
  const scripts = packageJson.scripts ?? {};

  if (scripts.verify) {
    return;
  }

  const verifyCommands = [
    scripts.test ? 'npm test -- --watch=false' : undefined,
    scripts.e2e ? 'npm run e2e' : undefined,
    scripts.build ? 'npm run build' : undefined,
    scripts.lint ? 'npm run lint' : undefined,
  ].filter((command): command is string => Boolean(command));

  if (verifyCommands.length === 0) {
    return;
  }

  packageJson.scripts = {
    ...scripts,
    verify: verifyCommands.join(' && '),
  };

  writeJson(tree, '/package.json', packageJson);
}

function readJson(tree: Tree, path: string): Record<string, any> {
  const content = tree.readText(path);
  return JSON.parse(content) as Record<string, any>;
}

function writeJson(tree: Tree, path: string, value: Record<string, any>): void {
  tree.overwrite(path, `${JSON.stringify(value, null, 2)}\n`);
}