import documenter from './transform';
import imp from './import';
import { readFile, writeFile } from 'fs';
import path from 'path';
import frontmatter from 'front-matter';

var minify = require('html-minifier').minify;

const readFileAsync = filename =>
  new Promise((resolve, reject) =>
    readFile(filename, 'utf8', (err, data) => {
      if (err) reject(err);
      else resolve(data);
    })
  );

const writeFileAsync = (filename, data) =>
  new Promise((resolve, reject) =>
    writeFile(filename, data, err => {
      if (err) reject(err);
      else resolve(filename);
    })
  );

const load = (filename, importHandler) => {
  const file = path.normalize(filename);
  return readFileAsync(file)
    .then(data => imp(data, file, importHandler))
    .then(data => {
      const f = frontmatter(data);

      return `---
${f.frontmatter} 
---
${importHandler(f)}`;
    })
    .then(documenter)
    .then(data =>
      minify(data, {
        collapseWhitespace: true,
        //preserveLineBreaks: false,
        minifyJS: true,
        minifyCSS: true
        // removeAttributeQuotes: true
      })
    )
    .then(data => {
      console.log('\x1b[32m', '\n√  File converted');
      return data;
    })
    .catch(e =>
      // console.log(
      //   '\x1b[31m',
      //   '\n⚠  Documenter Error\n  ',
      //   e.message.replace(',', '\n  '),
      //   '\x1b[0m'
      // )
      console.error(e)
    );
};

export { readFileAsync, writeFileAsync };

export default load;