import Dot from 'dot';
import { readFile, writeFile } from 'fs/promises';
import { join } from 'path';
import { debuglog } from 'util';

const internals = {
  debuglog: debuglog('blog'),

  kTextName: 'index.txt'
};

/**
 * Generates a TXT version of the blog
 *
 * @name TXTGenerator
 * @param {string} source the source directory
 * @param {string} target the target directory
 * @param {Array.<Blog.tPost>} posts the list of posts
 */
export default async function TXTGenerator(source, target, posts) {

  internals.debuglog('Generating TXT');
  const textTarget = join(target, internals.kTextName);
  const textLocation = join(source, internals.kTextName);

  internals.debuglog(`Reading ${textLocation}`);
  const textTemplate = await readFile(textLocation, { encoding: 'utf8' });

  internals.debuglog('Writing TXT');
  const text = Dot.template(textTemplate, {
    ...Dot.templateSettings,
    strip: false
  })({ posts });
  await writeFile(textTarget, text);
}