/********************************************************************
* UTILS
*********************************************************************/
function splitTextarea(text) {
  return text.trim().replace(/\s+/, '\n').replace(/\n{2,}/, '').split('\n');
}

// Download using fetch API..
import download from 'downloadjs';
const handleBufferDownload = (filename) => {
  res.arrayBuffer()
    .then((buffer) => {
      download(buffer, filename, contentType);
      stopLoading();
    });
};

// http://stackoverflow.com/a/23842171
encodeURIComparison = function() {
  var arr = [];
  for(var i=0; i<256; i++) {
    var char=String.fromCharCode(i);
    if(encodeURI(char) !== encodeURIComponent(char)) {
      arr.push({
        character: char,
        encodeURI: encodeURI(char),
        encodeURIComponent: encodeURIComponent(char)
      });
    }
  }
  console.table(arr);  
};

function encodeQueryParams (url, queryParams) {
  return Object.keys(queryParams).reduce((a, key) => {
    a.push(key + '=' + encodeURIComponent(queryParams[key]));
    return a;
  }, []).join('&');
}

let queryString = encodeQueryParams(queryParams);
url += url.indexOf('?') > -1 ? '&' : '?' + queryString;

/********************************************************************
* JQUERY COLOR CONTRAST 
*********************************************************************/
jQuery.Color.fn.contrastColor = function() {
    var r = this._rgba[0], g = this._rgba[1], b = this._rgba[2];
    return (((r*299)+(g*587)+(b*144))/1000) >= 131.5 ? "black" : "white";
};

// usage examples:
jQuery.Color("#bada55").contrastColor(); // "black"
element.css( "color", jQuery.Color( element, "backgroundColor" ).contrastColor() );


/********************************************************************
* MANY TO MANY 
*********************************************************************/
var fake_data_points = [
  { id: 1, name: 'Can its beauty be refurbished?' },
  { id: 2, name: 'Offers online car cleaning?' },
  { id: 3, name: 'Has shopping cart?' }
];

var fake_projects = [
  { id: 1, name: 'Auto' },
  { id: 2, name: 'Beauty' }
];

var fake_data_points_to_project = [
  { id: 1, data_point_id: 1, project_id: 1 },
  { id: 2, data_point_id: 1, project_id: 2 },
  { id: 4, data_point_id: 2, project_id: 1 },
  { id: 5, data_point_id: 2, project_id: 2 }
];

exports.get_many_to_many = function(params) {
  var many_to_many_data = _.where(params.many_to_many, params.lookup);
  var related_table_index = _.indexBy(params.related_table, 'id');

  return _.map(many_to_many_data, function(object) {
    return related_table_index[object[params.related_id]];
  });
};

get_many_to_many({
  many_to_many: fake_data_points_to_project,
  table: fake_data_points,
  related_table: fake_data_points,
  lookup: {'data_point_id': 1},
  related_id: 'project_id'
});