/* Filepath utilities */
const path = require("path");
/* Promise library */
const bluebird = require("bluebird");
const hbs = require("handlebars");
/*  Creates promise-returning async functions
    from callback-passed async functions      */
const fs = bluebird.promisifyAll(require("fs"));
const { updateHTML } = require("./populate");
const { getConfig, outDir } = require("./utils");

const assetDir = path.resolve(`${__dirname}/assets/`);
const config = path.join(outDir, "config.json");

/**
 * Creates the stylesheet used by the site from a template stylesheet.
 *
 * Theme styles are added to the new stylesheet depending on command line
 * arguments.
 */
async function populateCSS({
  theme = "light",
  background = "https://images.unsplash.com/photo-1553748024-d1b27fb3f960?w=1500&q=80"
} = {}) {
  /* Get the theme the user requests. Defaults to 'light' */
  theme = `${theme}.css`;
  let template = path.resolve(assetDir, "index.css");
  let stylesheet = path.join(outDir, "index.css");

  try {
    await fs.accessAsync(outDir, fs.constants.F_OK);
  } catch (err) {
    await fs.mkdirAsync(outDir);
  }
  /* Copy over the template CSS stylesheet */
  await fs.copyFileAsync(template, stylesheet);

  /* Get an array of every available theme */
  let themes = await fs.readdirAsync(path.join(assetDir, "themes"));

  if (!themes.includes(theme)) {
    console.error('Error: Requested theme not found. Defaulting to "light".');
    theme = "light";
  }
  /* Read in the theme stylesheet */
  let themeSource = await fs.readFileSync(path.join(assetDir, "themes", theme));
  themeSource = themeSource.toString("utf-8");
  let themeTemplate = hbs.compile(themeSource);
  let styles = themeTemplate({
    background: `${background}`
  });
  /* Add the user-specified styles to the new stylesheet */
  await fs.appendFileAsync(stylesheet, styles);

  /* Update the config file with the user's theme choice */
  const data = await getConfig();
  data[0].theme = theme;
  await fs.writeFileAsync(config, JSON.stringify(data, null, " "));
}

async function populateConfig(
  sort,
  order,
  includeFork,
  twitter,
  linkedin,
  medium,
  dribbble
) {
  const data = await getConfig();
  data[0].sort = sort;
  data[0].order = order;
  data[0].includeFork = includeFork;
  data[0].twitter = twitter; // added twitter
  data[0].linkedin = linkedin; // added linkedin
  data[0].medium = medium; // added medium
  data[0].dribbble = dribbble; // added dribbble
  await fs.writeFileAsync(config, JSON.stringify(data, null, " "));
}

async function buildCommand(username, program) {
  await populateCSS(program);
  let sort = program.sort ? program.sort : "created";
  let order = program.order ? program.order : "asc";
  let includeFork = program.fork ? true : false;
  let twitter = program.twitter ? program.twitter : null;
  let linkedin = program.linkedin ? program.linkedin : null;
  let medium = program.medium ? program.medium : null;
  let dribbble = program.dribbble ? program.dribbble : null;
  await populateConfig(
    sort,
    order,
    includeFork,
    twitter,
    linkedin,
    medium,
    dribbble
  );
  updateHTML(
    ("%s", username),
    sort,
    order,
    includeFork,
    twitter,
    linkedin,
    medium,
    dribbble
  );
}

module.exports = {
  buildCommand,
  populateCSS,
  populateConfig
};