/*
  This is the builder script that generates the README and SNIPPETS_ARCHIVE files.
  Run using `npm run builder`.
*/
// Load modules
const fs = require('fs-extra');
const path = require('path');
const chalk = require('chalk');
const util = require('./util');
const markdown = require('markdown-builder');
const { headers, misc, lists } = markdown;

// Paths
const SNIPPETS_PATH = './snippets';
const SNIPPETS_ARCHIVE_PATH = './snippets_archive';
const STATIC_PARTS_PATH = './static-parts';

const makeExamples = data => {
  data =
    data.slice(0, data.lastIndexOf('```js')).trim() +
    misc.collapsible(
      'Examples',
      data.slice(data.lastIndexOf('```js'), data.lastIndexOf('```')) +
        data.slice(data.lastIndexOf('```'))
    );
  return `${data}\n<br>${misc.link('⬆ Back to top', misc.anchor('Table of Contents'))}\n\n`;
};

if (util.isTravisCI() && /^Travis build: \d+/g.test(process.env['TRAVIS_COMMIT_MESSAGE'])) {
  console.log(
    `${chalk.green('NOBUILD')} README build terminated, parent commit is a Travis build!`
  );
  process.exit(0);
}
if (
  util.isTravisCI() &&
  (process.env['TRAVIS_EVENT_TYPE'] === 'cron' || process.env['TRAVIS_EVENT_TYPE'] === 'api')
) {
  console.log(`${chalk.green('ARCHIVE')} Cron job or custom build, building archive README!`);
  console.time('Builder');
  let snippets = {};
  // Synchronously read all snippets from snippets_archive folder and sort them as necessary (case-insensitive)
  try {
    const snippetFilenames = fs
      .readdirSync(SNIPPETS_ARCHIVE_PATH)
      .sort((a, b) => a.toLowerCase() - b.toLowerCase());
    // Store the data read from each snippet in the appropriate object
    for (const name of snippetFilenames.filter(s => s !== 'README.md')) {
      snippets[name] = fs.readFileSync(path.join(SNIPPETS_ARCHIVE_PATH, name), 'utf8');
    }
  } catch (err) {
    console.log(`${chalk.red('ERROR!')} During snippet loading: ${err}`);
    process.exit(1);
  }
  try {
    // Add the start static part
    let output =
      misc.image('Logo', '/logo.png') +
      headers.h1('Snippets Archive') +
      "These snippets, while useful and interesting, didn't quite make it into the repository due to either having very specific use-cases or being outdated. However we felt like they might still be useful to some readers, so here they are." +
      headers.h2('Table of Contents');

    output += lists.ul(Object.entries(snippets), snippet =>
      misc.link(`\`${snippet[0].slice(0, -3)}\``, misc.anchor(snippet[0].slice(0, -3)))
    );
    output += misc.hr();

    for (const snippet of Object.entries(snippets)) {
      output += makeExamples(snippet[1]);
    }

    // Write to the README file of the archive
    fs.writeFileSync(path.join(SNIPPETS_ARCHIVE_PATH, 'README.md'), output);
  } catch (err) {
    console.log(`${chalk.red('ERROR!')} During README generation for snippets archive: ${err}`);
    process.exit(1);
  }

  console.log(`${chalk.green('SUCCESS!')} README file generated for snippets archive!`);
  console.timeEnd('Builder');
}
let snippets = {};
const EMOJIS = {
  adapter: '🔌',
  array: '📚',
  browser: '🌐',
  date: '⏱️',
  function: '🎛️',
  logic: '🔮',
  math: '➗',
  media: '📺',
  node: '📦',
  object: '🗃️',
  string: '📜',
  type: '📃',
  utility: '🔧'
};

let startPart = '',
  endPart = '',
  output = '',
  tagDbData = {};

console.time('Builder');

// Synchronously read all snippets from snippets folder and sort them as necessary (case-insensitive)
snippets = util.readSnippets(SNIPPETS_PATH);

// Load static parts for the README file
try {
  startPart = fs.readFileSync(path.join(STATIC_PARTS_PATH, 'README-start.md'), 'utf8');
  endPart = fs.readFileSync(path.join(STATIC_PARTS_PATH, 'README-end.md'), 'utf8');
} catch (err) {
  console.log(`${chalk.red('ERROR!')} During static part loading: ${err}`);
  process.exit(1);
}

// Load tag data from the database
tagDbData = util.readTags();
console.log(tagDbData);

// Create the output for the README file
try {
  const tags = util.prepTaggedData(tagDbData);

  // Add the start static part
  output += `${startPart}\n`;

  // Loop over tags and snippets to create the table of contents
  for (const tag of tags) {
    const capitalizedTag = util.capitalize(tag, true);
    const taggedSnippets = Object.entries(tagDbData).filter(v => v[1][0] === tag);
    output += headers.h3((EMOJIS[tag] || '') + ' ' + capitalizedTag).trim();

    output +=
      misc.collapsible(
        'View contents',
        lists.ul(taggedSnippets, snippet =>
          misc.link(
            `\`${snippet[0]}\``,
            `${misc.anchor(snippet[0])}${snippet[1].includes('advanced') ? '-' : ''}`
          )
        )
      ) + '\n';
  }

  // Loop over tags and snippets to create the list of snippets
  for (const tag of tags) {
    const capitalizedTag = util.capitalize(tag, true);
    const taggedSnippets = Object.entries(tagDbData).filter(v => v[1][0] === tag);

    output += misc.hr() + headers.h2((EMOJIS[tag] || '') + ' ' + capitalizedTag) + '\n';

    for (const taggedSnippet of taggedSnippets) {
      let snippet = snippets[taggedSnippet[0] + '.md'];

      // Add advanced tag
      if (taggedSnippet[1].includes('advanced')) {
        snippet = snippet.split(/\r?\n/);
        // add label to snippet title (first line)
        snippet[0] += ' ' + misc.image('advanced', '/advanced.svg');
        snippet = snippet.join('\n');
      }

      output += makeExamples(snippet);
    }
  }

  // Add the ending static part
  output += `\n${endPart}\n`;
  // Write to the README file
  fs.writeFileSync('README.md', output);
} catch (err) {
  console.log(`${chalk.red('ERROR!')} During README generation: ${err}`);
  process.exit(1);
}

console.log(`${chalk.green('SUCCESS!')} README file generated!`);
console.timeEnd('Builder');
