//
// Copyright 2021 DXOS.org
//

const chalk = require('chalk');
import fs from 'fs';
import path from 'path';
import YAML from 'yaml';
import { Argv, CommandModule } from 'yargs';

import { printKeyValue, sorter } from '../helpers';

type Topic = {
  topic: string
  docs?: string[]
  snippets?: string[]
}

type File = {
  topics: Topic[]
}

const print = ({ topic, docs, snippets }: Topic) => {
  console.log(chalk.green(topic));

  if (docs && docs.length) {
    printKeyValue('Docs', docs[0], 'blue');
    docs.slice(1).forEach(doc => printKeyValue('', doc, 'blue'));
  }

  if (snippets && snippets.length) {
    printKeyValue('Snippets', snippets[0], 'green');
    snippets.slice(1).forEach(snippet => printKeyValue('', snippet, 'green'));
  }

  console.log();
}

/**
 * Hints commands.
 */
export const kbaseModule: CommandModule = {
  command: 'kbase [search]',
  aliases: ['k'],
  describe: 'Knowledge base.',
  builder: (yargs: Argv) => yargs
    .option('list', {
      default: false,
      requiresArg: false
    })
    .option('file', {
      // TODO(burdon): Get from Github.
      default: path.join(__dirname, '../../data/kbase.yml')
    }),
  handler: async ({ search, list, file: filename }: any) => {
    const file = fs.readFileSync(filename, 'utf8')
    const { topics } = YAML.parse(file) as File;
    topics.sort(sorter('topic'));

    if (list) {
      topics.forEach(({ topic }) => console.log(topic));
    } else {
      topics
        .filter((topic) => !search || topic.topic.toLowerCase().indexOf(search) !== -1)
        .forEach(print);
    }
  }
};