import {
  BuilderContext,
  BuilderOutput,
  createBuilder,
} from '@angular-devkit/architect';
import build from 'next/dist/build';
import { PHASE_PRODUCTION_BUILD } from 'next/dist/next-server/lib/constants';
import * as path from 'path';
import { copySync } from 'fs-extra';
import { from, Observable } from 'rxjs';
import { concatMap, map, tap } from 'rxjs/operators';
import { prepareConfig } from '../../utils/config';
import { NextBuildBuilderOptions } from '../../utils/types';
import { createPackageJson } from './lib/create-package-json';
import { createNextConfigFile } from './lib/create-next-config-file';
import { join } from 'path';

try {
  require('dotenv').config();
} catch (e) {}

export default createBuilder<NextBuildBuilderOptions>(run);

export function run(
  options: NextBuildBuilderOptions,
  context: BuilderContext
): Observable<BuilderOutput> {
  const root = path.resolve(context.workspaceRoot, options.root);
  const config = prepareConfig(PHASE_PRODUCTION_BUILD, options, context);
  return from(build(root, config as any)).pipe(
    concatMap(() => from(createPackageJson(options, context))),
    concatMap(() => from(createNextConfigFile(options, context))),
    tap(() => {
      copySync(join(root, 'public'), join(options.outputPath, 'public'));
    }),
    map(() => ({ success: true }))
  );
}