/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Arguments, Argv} from 'yargs';

import {error} from '../../utils/console';
import {addGithubTokenOption} from '../../utils/git/github-yargs';

import {discoverNewConflictsForPr} from './index';

/** The options available to the discover-new-conflicts command via CLI. */
export interface DiscoverNewConflictsCommandOptions {
  date: number;
  'pr-number': number;
}

/** Builds the discover-new-conflicts pull request command. */
export function buildDiscoverNewConflictsCommand(yargs: Argv):
    Argv<DiscoverNewConflictsCommandOptions> {
  return addGithubTokenOption(yargs)
      .option('date', {
        description: 'Only consider PRs updated since provided date',
        defaultDescription: '30 days ago',
        coerce: (date) => typeof date === 'number' ? date : Date.parse(date),
        default: getThirtyDaysAgoDate(),
      })
      .positional('pr-number', {demandOption: true, type: 'number'});
}

/** Handles the discover-new-conflicts pull request command. */
export async function handleDiscoverNewConflictsCommand(
    {'pr-number': prNumber, date}: Arguments<DiscoverNewConflictsCommandOptions>) {
  // If a provided date is not able to be parsed, yargs provides it as NaN.
  if (isNaN(date)) {
    error('Unable to parse the value provided via --date flag');
    process.exit(1);
  }
  await discoverNewConflictsForPr(prNumber, date);
}

/** Gets a date object 30 days ago from today. */
function getThirtyDaysAgoDate() {
  const date = new Date();
  // Set the hours, minutes and seconds to 0 to only consider date.
  date.setHours(0, 0, 0, 0);
  // Set the date to 30 days in the past.
  date.setDate(date.getDate() - 30);
  return date.getTime();
}