'use strict';

var marked = require('marked');
var assign = require('object-assign');
var stripIndent = require('strip-indent');
var util = require('hexo-util');

var highlight = util.highlight;
var stripHTML = util.stripHTML;
var MarkedRenderer = marked.Renderer;

function Renderer() {
  MarkedRenderer.apply(this);

  this._headingId = {};
}

require('util').inherits(Renderer, MarkedRenderer);

// Support To-Do List
Renderer.prototype.listitem = function(text) {
  var result;

  if (/^\s*\[[x ]\]\s*/.test(text)) {
    text = text.replace(/^\s*\[ \]\s*/, '<input type="checkbox"></input> ').replace(/^\s*\[x\]\s*/, '<input type="checkbox" checked></input> ');
    result = '<li style="list-style: none">' + text + '</li>\n';
  } else {
    result = '<li>' + text + '</li>\n';
  }

  return result;
};

// Add id attribute to headings
Renderer.prototype.heading = function(text, level) {
  var transformOption = this.options.modifyAnchors;
  var id = anchorId(stripHTML(text), transformOption);
  var headingId = this._headingId;

  // Add a number after id if repeated
  if (headingId[id]) {
    id += '-' + headingId[id]++;
  } else {
    headingId[id] = 1;
  }
  // add headerlink
  return '<h' + level + ' id="' + id + '"><a href="#' + id + '" class="headerlink" title="' + stripHTML(text) + '"></a>' + text + '</h' + level + '>';
};

function anchorId(str, transformOption) {
  return util.slugize(str.trim(), {transform: transformOption});
}

// Support AutoLink option
Renderer.prototype.link = function(href, title, text) {
  var prot;

  if (this.options.sanitize) {
    try {
      prot = decodeURIComponent(unescape(href))
          .replace(/[^\w:]/g, '')
          .toLowerCase();
    } catch (e) {
      return '';
    }

    if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
      return '';
    }
  }

  if (!this.options.autolink && href === text && title == null) {
    return href;
  }

  var out = '<a href="' + href + '"';

  if (title) {
    out += ' title="' + title + '"';
  }

  out += '>' + text + '</a>';
  return out;
};

marked.setOptions({
  langPrefix: '',
  highlight: function(code, lang) {
    return highlight(stripIndent(code), {
      lang: lang,
      gutter: false,
      wrap: false
    });
  }
});

module.exports = function(data, options) {
  return marked(data.text, assign({
    renderer: new Renderer()
  }, this.config.marked, options));
};