/*
 * Example tab-separated input:
 * Some fields will be ignored
 *
 * id	name	metacode	desc	link	user.name	permission	synapses		
 * 1	topic1	Catalyst			admin	commons	1->7		
 * 2	topic2	Event			admin	commons			
 * 5	topic	Action			admin	commons			
 * 6	topic6	Action			admin	commons	6->7		
 * 7	topic7	Action			admin	commons	7->8	 7<-6	 7<-1
 * 8	topic8	Action			admin	commons	8<-7		
 */

Metamaps.Import = {
  headersWhitelist: [
		'name', 'metacode', 'desc', 'link', 'permission'
	],

  init: function() {
    var self = Metamaps.Import;
    $('body').bind('paste', function(e) {
      var text = e.originalEvent.clipboardData.getData('text/plain');
      var parsed = self.parseTabbedString(text);

      if (parsed.length > 0 &&
        confirm("Are you sure you want to create " + parsed.length +
                " new topics?")) {
        self.importTopics(parsed);
      }//if
    });
  },

  importTopics: function(parsedTopics) {
    var self = Metamaps.Import;

    var x = -200;
    var y = -200;
    parsedTopics.forEach(function(topic) {
      self.createTopicWithParameters(
        topic.name, topic.metacode, topic.permission,
        topic.desc, topic.link, x, y
      );

      // update positions of topics
      x += 50;
      if (x > 200) {
        y += 50;
        x = -200;
      }//if
    });
  },

  parseTabbedString: function(text) {
    var self = Metamaps.Import;

    // determine line ending and split lines
    var delim = "\n";
    if (text.indexOf("\r\n") !== -1) {
      delim = "\r\n";
    }//if
    var lines = text.split(delim);

    // get csv-style headers to name the object fields
    var headers = lines[0].split('	'); //tab character

    var results = [];
    lines.forEach(function(line, index) {
      if (index === 0) return;
      if (line == "") return;

      var topic = {};
      line.split("	").forEach(function(field, index) {
				if (self.headersWhitelist.indexOf(headers[index]) === -1) return;
        topic[headers[index]] = field;
      });
      results.push(topic);
    });
    return results;
  },

  createTopicWithParameters: function(name, metacode_name, permission, desc,
                                      link, xloc, yloc) {
    var self = Metamaps.Topic;

    var metacode = Metamaps.Metacodes.where({name: metacode_name})[0] || null;
    if (metacode === null) return console.error("metacode not found");

    var topic = new Metamaps.Backbone.Topic({
      name: name,
      metacode_id: metacode.id,
      permission: permission || Metamaps.Active.Map.get('permission'),
      desc: desc,
      link: link
    });
    Metamaps.Topics.add(topic);

    var mapping = new Metamaps.Backbone.Mapping({
        xloc: xloc,
        yloc: yloc,
        mappable_id: topic.cid,
        mappable_type: "Topic",
    });
    Metamaps.Mappings.add(mapping);

    // this function also includes the creation of the topic in the database
    self.renderTopic(mapping, topic, true, true);
  },
};