// Helper functions
var crypto = require('crypto');

// sha256 hex-hashes password with supplied salt.
// Returns hex-hash string
exports.hashPassword = function(password, salt) {
  var hash = crypto.createHash('sha256');
  hash.update(password);
  hash.update(salt);
  return hash.digest('hex');
}

// Convert date() to epoch
exports.dateToEpoch = function(date) {
    return Math.floor(date);
};

// Convert epoch (in seconds) to date string
exports.epochToDateString = function(epoch) {
    var date = new Date(epoch);
    return date.toLocaleString();
};

// Convert epoch to an ISO formatted date.
exports.epochToShortDateString = function(epoch) {
    var date = new Date(epoch);
    return date.toISOString().slice(0,10);
}

// Build a slug from a title string
// Returns the slug as a string
exports.makeSlug = function(str) {
      str = str.replace(/^\s+|\s+$/g, ''); // trim
      str = str.toLowerCase();
      str = str.trim();

      // remove accents, swap ñ for n, etc
      var from = "àáäâèéëêìíïîòóöôùúüûñç·/_,:;&";
      var to   = "aaaaeeeeiiiioooouuuunc-------";
      for (var i=0, l=from.length ; i<l ; i++) {
        str = str.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
      }

      str = str.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
        .replace(/\s+/g, '-') // collapse whitespace and replace by -
        .replace(/-+/g, '-'); // collapse dashes

      return str;
};

// Parse a string of tags
// Returns a list of tags
exports.parseTags = function(str) {
    console.log('tag parse '+str);
    str = str.replace(/,/g,'');
    console.log('tag parse '+str);
    var list = str.split(" ");
    console.log('tag parse '+list);
    for (var i = 0, size = list.length; i < size; i++) {
        list[i] = list[i].trim();
    }
    console.log('tag parse '+list);
    return list
}