'use strict'

var editor = {}

editor.textareaAutoGrow = function () {
  let autogrow = function () {
    console.log(this.style.height)
    this.style.height = 'auto'
    this.style.height = (this.scrollHeight) + 'px'
  }

  let textareas = document.getElementsByTagName('textarea')

  let addAutoGrow = () => {
    Array.from(textareas).forEach(textarea => {
      autogrow.bind(textarea)()
      textarea.addEventListener('keyup', autogrow)
    })
  }

  addAutoGrow()
  window.addEventListener('resize', addAutoGrow)
}

editor.toggleSourceEditor = function (event) {
  event.preventDefault()

  if (document.querySelector('[data-kind="content-only"]')) {
    window.location = window.location.pathname + '?visual=true'
    return
  }

  window.location = window.location.pathname + '?visual=false'
}

function deleteFrontMatterItem (event) {
  event.preventDefault()
  document.getElementById(this.dataset.delete).remove()
}

function makeFromBaseTemplate (id, type, name, parent) {
  let clone = document.importNode(templates.base.content, true)
  clone.querySelector('fieldset').id = id
  clone.querySelector('fieldset').dataset.type = type
  clone.querySelector('h3').innerHTML = name
  clone.querySelector('.delete').dataset.delete = id
  clone.querySelector('.delete').addEventListener('click', deleteFrontMatterItem)
  clone.querySelector('.add').addEventListener('click', addFrontMatterItem)

  if (parent.classList.contains('frontmatter')) {
    parent.insertBefore(clone, document.querySelector('div.button.add'))
    return
  }

  parent.appendChild(clone)
}

function makeFromArrayItemTemplate (id, number, parent) {
  let clone = document.importNode(templates.arrayItem.content, true)
  clone.querySelector('[data-type="array-item"]').id = `${id}-${number}`
  clone.querySelector('input').name = id
  clone.querySelector('input').id = id
  clone.querySelector('div.action').dataset.delete = `${id}-${number}`
  clone.querySelector('div.action').addEventListener('click', deleteFrontMatterItem)
  parent.querySelector('.group').appendChild(clone)
  document.getElementById(`${id}-${number}`).querySelector('input').focus()
}

function makeFromObjectItemTemplate (id, name, parent) {
  let clone = document.importNode(templates.objectItem.content, true)
  clone.querySelector('.block').id = `block-${id}`
  clone.querySelector('.block').dataset.content = id
  clone.querySelector('label').for = id
  clone.querySelector('label').innerHTML = name
  clone.querySelector('input').name = id
  clone.querySelector('input').id = id
  clone.querySelector('.action').dataset.delete = `block-${id}`
  clone.querySelector('.action').addEventListener('click', deleteFrontMatterItem)

  parent.appendChild(clone)
  document.getElementById(id).focus()
}

function addFrontMatterItemPrompt (parent) {
  return function (event) {
    event.preventDefault()

    let value = event.currentTarget.querySelector('input').value
    if (value === '') {
      return true
    }

    closePrompt(event)

    let name = value.substring(0, value.lastIndexOf(':')),
      type = value.substring(value.lastIndexOf(':') + 1, value.length)

    if (type !== '' && type !== 'array' && type !== 'object') {
      name = value
    }

    name = name.replace(' ', '_')

    let id = name

    if (parent.id != '') {
      id = parent.id + '.' + id
    }

    if (type == 'array' || type == 'object') {
      if (parent.dataset.type == 'parent') {
        makeFromBaseTemplate(id, type, name, document.querySelector('.frontmatter'))
        return
      }

      makeFromBaseTemplate(id, type, name, block)
      return
    }

    let group = parent.querySelector('.group')

    if (group == null) {
      parent.insertAdjacentHTML('afterbegin', '<div class="group"></div>')
      group = parent.querySelector('.group')
    }

    makeFromObjectItemTemplate(id, name, group)
  }
}

function addFrontMatterItem (event) {
  event.preventDefault()

  let parent = event.currentTarget.parentNode,
    type = parent.dataset.type

  // If the block is an array
  if (type === 'array') {
    let id = parent.id + '[]',
      count = parent.querySelectorAll('.group > div').length,
      fieldsets = parent.getElementsByTagName('fieldset')

    if (fieldsets.length > 0) {
      let itemType = fieldsets[0].dataset.type,
        itemID = parent.id + '[' + fieldsets.length + ']',
        itemName = fieldsets.length

      makeFromBaseTemplate(itemID, itemType, itemName, parent)
    } else {
      makeFromArrayItemTemplate(id, count, parent)
    }

    return
  }

  if (type == 'object' || type == 'parent') {
    let clone = document.importNode(templates.question.content, true)
    clone.querySelector('form').id = tempID
    clone.querySelector('h3').innerHTML = 'New field'
    clone.querySelector('p').innerHTML = 'Write the field name and then press enter. If you want to create an array or an object, end the name with <code>:array</code> or <code>:object.</code>'
    clone.querySelector('.ok').innerHTML = 'Create'
    clone.querySelector('form').addEventListener('submit', addFrontMatterItemPrompt(parent))
    clone.querySelector('form').classList.add('active')
    document.querySelector('body').appendChild(clone)

    document.querySelector('.overlay').classList.add('active')
    document.getElementById(tempID).classList.add('active')
  }

  return false
}

document.addEventListener('DOMContentLoaded', (event) => {
  if (!document.getElementById('editor')) return

  editor.textareaAutoGrow()

  templates.arrayItem = document.getElementById('array-item-template')
  templates.base = document.getElementById('base-template')
  templates.objectItem = document.getElementById('object-item-template')
  templates.temporary = document.getElementById('temporary-template')

  buttons.save = document.querySelector('#save')
  buttons.editSource = document.querySelector('#edit-source')

  if (buttons.editSource) {
    buttons.editSource.addEventListener('click', editor.toggleSourceEditor)
  }

  let container = document.getElementById('editor'),
    kind = container.dataset.kind,
    rune = container.dataset.rune

  if (kind != 'frontmatter-only') {
    let editor = document.querySelector('.content #ace'),
      mode = editor.dataset.mode,
      textarea = document.querySelector('textarea[name="content"]'),
      aceEditor = ace.edit('ace'),
      options = {
        wrap: true,
        maxLines: Infinity,
        theme: 'ace/theme/github',
        showPrintMargin: false,
        fontSize: '1em',
        minLines: 20
    }

    aceEditor.getSession().setMode('ace/mode/' + mode)
    aceEditor.getSession().setValue(textarea.value)
    aceEditor.getSession().on('change', function () {
      textarea.value = aceEditor.getSession().getValue()
    })

    if (mode == 'markdown') options.showGutter = false
    aceEditor.setOptions(options)
  }

  let deleteFrontMatterItemButtons = document.getElementsByClassName('delete')
  Array.from(deleteFrontMatterItemButtons).forEach(button => {
    button.addEventListener('click', deleteFrontMatterItem)
  })

  let addFrontMatterItemButtons = document.getElementsByClassName('add')
  Array.from(addFrontMatterItemButtons).forEach(button => {
    button.addEventListener('click', addFrontMatterItem)
  })

  let saveContent = function () {
    let data = form2js(document.querySelector('form'))

    if (typeof data.content === 'undefined' && kind !== 'frontmatter-only') {
      data.content = ''
    }

    if (typeof data.content === 'number') {
      data.content = data.content.toString()
    }

    let request = new XMLHttpRequest()

    buttons.setLoading('save')

    webdav.put(window.location.pathname, JSON.stringify(data), {
      'Kind': kind,
      'Rune': rune
    })
      .then(() => {
        buttons.setDone('save')
      })
      .catch(e => {
        console.log(e)
        buttons.setDone('save', false)
      })
  }

  document.querySelector('#save').addEventListener('click', event => {
    event.preventDefault()
    saveContent()
  })

  document.querySelector('form').addEventListener('submit', (event) => {
    event.preventDefault()
    saveContent()
  })

  window.addEventListener('keydown', (event) => {
    if (event.ctrlKey || event.metaKey) {
      switch (String.fromCharCode(event.which).toLowerCase()) {
        case 's':
          event.preventDefault()
          saveContent()
          break
      }
    }
  })

  return false
})