'use strict';

/* global hexo */

const pandocRenderer = require('./lib/renderer');

if (!("pandoc" in hexo.config)) {
  hexo.config.pandoc = new Object();
}

hexo.config.pandoc.katex = Object.assign(
  {
    enable: true,
    output: 'htmlAndMathml',
    throwOnError: false,
    strict: 'warn',
    cdn: 'jsdelivr'
  },
  hexo.config.pandoc.katex
);

hexo.config.pandoc = Object.assign(
  {
    pandocPath: 'pandoc',
    timeout: 5000,
    mode: 'markdown',
    extensions: []
  },
  hexo.config.pandoc
);

hexo.extend.renderer.register('md', 'html', pandocRenderer, true);
hexo.extend.renderer.register('markdown', 'html', pandocRenderer, true);
hexo.extend.renderer.register('mkd', 'html', pandocRenderer, true);
hexo.extend.renderer.register('mkdn', 'html', pandocRenderer, true);
hexo.extend.renderer.register('mdwn', 'html', pandocRenderer, true);
hexo.extend.renderer.register('mdtxt', 'html', pandocRenderer, true);
hexo.extend.renderer.register('mdtext', 'html', pandocRenderer, true);

if (hexo.config.pandoc.katex.enable) {
  const { version } = require('katex');
  const urls = {
    cdnjs: `https://cdnjs.cloudflare.com/ajax/libs/katex/${ version }/katex.min.css`,
    loli: `https://cdnjs.loli.net/ajax/libs/KaTeX/${ version }/katex.min.css`,
    jsdelivr: `https://cdn.jsdelivr.net/npm/katex@${ version }/dist/katex.min.css`,
    unpkg: `https://unpkg.com/katex@${ version }/dist/katex.min.css`
  };
  
  const cdn = hexo.config.pandoc.katex.cdn;
  const url = (cdn in urls) ? urls[cdn] : cdn.replace(/\${\s*version\s*}/gi, version);

  hexo.extend.injector.register('head_end', `<link rel="stylesheet" href="${ url }"/>`);
}