/* global Metamaps, $ */

/*
 * Metamaps.PasteInput.js.erb
 *
 * Dependencies:
 *  - Metamaps.Import
 *  - Metamaps.AutoLayout
 */

Metamaps.PasteInput = {
  // thanks to https://github.com/kevva/url-regex
  URL_REGEX: new RegExp('^(?:(?:(?:[a-z]+:)?//)|www\.)(?:\S+(?::\S*)?@)?(?:localhost|(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])(?:\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])){3}|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#][^\s"]*)?$'),

  init: function () {
    var self = Metamaps.PasteInput

    // intercept dragged files
    // see http://stackoverflow.com/questions/6756583
    window.addEventListener("dragover", function(e) {
      e = e || event;
      e.preventDefault();
    }, false);
    window.addEventListener("drop", function(e) {
      e = e || event;
      e.preventDefault();
      var coords = Metamaps.Util.pixelsToCoords({ x: e.clientX, y: e.clientY })
      if (e.dataTransfer.files.length > 0) {
        var fileReader = new FileReader()
        var text = fileReader.readAsText(e.dataTransfer.files[0])
        fileReader.onload = function(e) {
          var text = e.currentTarget.result
          if (text.substring(0,5) === '<?xml') {
            // assume this is a macOS .webloc link
            text = text.replace(/[\s\S]*<string>(.*)<\/string>[\s\S]*/m, '$1')
          }
          self.handle(text, coords)
        }
      }
      // OMG import bookmarks 😍
      if (e.dataTransfer.items.length > 0) {
        e.dataTransfer.items[0].getAsString(function(text) {
          if (text.match(self.URL_REGEX)) {
            self.handle(text, coords)
          }
        })
      }
    }, false);

    // allow pasting onto canvas (but don't break existing inputs/textareas)
    $('body').bind('paste', function (e) {
      if (e.target.tagName === 'INPUT') return
      if (e.target.tagName === 'TEXTAREA') return

      var text = e.originalEvent.clipboardData.getData('text/plain').trim()
      self.handle(text)
    })
  },

  handle: function(text, coords) {
    var self = Metamaps.PasteInput

    if (text.match(self.URL_REGEX)) {
      self.handleURL(text, coords)
    } else if (text[0] === '{') {
      self.handleJSON(text)
    } else if (text.match(/\t/)) {
      self.handleTSV(text)
    } else {
      // fail silently
    }
  },

  handleURL: function (text, coords) {
    var title = 'Link'
    if (!coords || !coords.x || !coords.y) {
      coords = Metamaps.AutoLayout.getNextCoord()
    }

    var import_id = null  // don't store a cidMapping
    var permission = null // use default

    // try {
    //   // fetch title in 150ms or less
    //   Promise.race([
    //     new Promise(function(resolve, reject) {
    //       fetch(text).then(function(response) {
    //         return response.text()
    //       }).then(function(html) {
    //         title = html.replace(/[\s\S]*<title>(.*)<\/title>[\s\S]*/m, '$1')
    //         resolve()
    //       })
    //     }), new Promise(function(resolve, reject) {
    //       window.setTimeout(function() {
    //         resolve()
    //       }, 150)
    //     })
    //   ]).then(function() {
    //     finish()
    //   }).catch(function(error) {
    //     throw error
    //   })
    // } catch (err) {
    //   console.warn("Your browser can't fetch the title") // TODO move to webpack to avoid this error
    // }
    finish()

    function finish() {
      Metamaps.Import.createTopicWithParameters(
        title,
        'Reference', // metacode - todo fix
        permission,
        text, // desc - todo load from url?
        text, // link - todo fix because this isn't being POSTed
        coords.x,
        coords.y,
        import_id
      )
    }
  },

  handleJSON: function (text) {
    Metamaps.Import.handleJSON(text)
  },

  handleTSV: function (text) {
    Metamaps.Import.handleTSV(text)
  }
}