#!/usr/bin/env node
const gravatar = require('gravatar')
const cheerio = require('cheerio')
const path = require('path')
const fs = require('fs')

const json = fs.readFileSync(path.join(__dirname, 'export.json')).toString()
  .replace(/\\\/blog\\\/wp-content\\\/uploads/g, '\/content\/images')
  .replace(/wp-content\\\/authors/g, 'content\/images\/authors')
  .replace(/wp-content\\\/uploads/g, 'content\/images')

const MD_IMAGE_REGEX = /!\[([^\]]*)\]\(([^\)]+)\)/

function _unescape(string) {
  return string.replace(/^\n+|\n+$/, '').replace(/\\u[a-f0-9]+/g, function (ret) {
    return String.fromCodePoint(parseInt(ret.replace(/\\u/, ''), 16))
  }).replace(/[\s\n](\*+)$/g, '$1')
}

function removeHTML(md) {
  return cheerio.load(md.replace(/<div\sclass="quote">\s*.([^"“”]+).\s*<\/div>/g, '> $1 \n\n')).text()
    .replace(/^(\*+)\s+/, '$1').replace(/\s+(\*+)$/, '$1');
}

function removeFeatureImage(md, featureImage) {
  if(!featureImage) return md;

  return md.replace(new RegExp(`!\\[[^\\]]*\\]\\(${featureImage}\\)`), '');
}

function convertDate(str) {
  return new Date(Date.parse(str)).toISOString()
}

const parsed = JSON.parse(json)

const dump = {
  meta: {
    // epoch time in milliseconds
    exported_on: new Date().getTime(),
    version: '2.14.0'
  },
  data: {
    posts: [],
    users: parsed.data.users.map(u => ({
      ...u,
      profile_image: !u.profile_image ? gravatar.url(u.email, {
        s: '250',
        r: 'x'
      }, true) : u.profile_image
    })),
    tags: parsed.data.tags,
    posts_tags: parsed.data.posts_tags
  }
}

parsed.data.posts.forEach(function (post) {
  const elements = post.markdown.replace(/\\\//g, '/').replace(/<\/figure>/g, '</figure>\n\n').split('\n\n')

  const mobileDoc = {
    version: '0.3.1',
    atoms: [],
    cards: [],
    markups: [],
    sections: []
  }

  let feature_image = null
  const $readMore = cheerio.load(post.html)
  const image = $readMore('img').get(0)
  if (image) {
    feature_image = image.attribs.src
  }

  let sectionIndex = 0

  const addCard = (type, card) => {
    mobileDoc.cards.push([type, card])
    addSection(10)
  }

  const addSection = (identifier) => {
    mobileDoc.sections.push([identifier, sectionIndex++])
  }

  const addMarkdownCard = (md) => {
    const prevCard = mobileDoc.cards[mobileDoc.cards.length - 1]
    if (prevCard && prevCard[0] === 'card-markdown') {
      prevCard[1].markdown += '\n\n' + md
      return
    }
    addCard('card-markdown', { cardName: 'card-markdown', markdown: md })
  }

  const addImage = (src, alt, caption) => {
    addCard('image', { src, caption, alt })
  }

  elements.map(_unescape).forEach((el) => {
    if (el.indexOf('<figure') > -1) {
      const m = el.match(MD_IMAGE_REGEX)
      if (m) {
        const alt = m[1]
        const src = unescape(m[2])
        const $ = cheerio.load('<div>' + unescape(el) + '</div>')
        const caption = $('figcaption').get(0);
        if (feature_image !== src) {
          addImage(src, alt, caption ? $(caption).text() : undefined)
        }
      }
    } else {
      addMarkdownCard(removeFeatureImage(removeHTML(el), feature_image))

    }
  })

  dump.data.posts.push(
    {
      id: post.id,
      title: removeHTML(post.title),
      slug: post.slug,
      mobiledoc: JSON.stringify(mobileDoc),
      feature_image,
      author_id: post.author_id,
      created_at: convertDate(post.created_at),
      created_by: post.created_by,
      updated_at: convertDate(post.updated_at),
      updated_by: post.updated_by,
      published_at: post.published_at ? convertDate(post.published_at) : null,
      published_by: post.published_by,
      status: post.status
    }
  )
  console.log(post.title)
})


fs.writeFileSync(path.join(__dirname, 'dump.json'), JSON.stringify(dump))