conveyal/modeify

var mongoose = require('../mongo')

/**
 * Schema
 */

var schema = new mongoose.Schema({
  tags: Array,
  name: String,
  title: String,
  description: String
})

/**
 * Match tags
 */

schema.methods.tagsContainsSubsetOf = function (tags) {
  for (var i = 0; i < this.tags.length; i++) {
    if (isSubsetOf(this.tags[i], tags)) return true
  }
  return false
}

/**
 * Plugins
 */

schema.plugin(require('../plugins/mongoose-trackable'))

/**
 * Expose `RouteResource`
 */

var RouteResource = module.exports = mongoose.model('RouteResource', schema)

/**
 * Find by tags
 */

RouteResource.findByTags = function (tags, callback) {
  if (!Array.isArray(tags)) tags = tags.split(',')
  RouteResource
    .find()
    .exec(function (err, resources) {
      if (err) {
        callback(err)
      } else if (!resources) {
        callback(null, [])
      } else {
        callback(null, resources.filter(function (resource) {
          return resource.tagsContainsSubsetOf(tags)
        }))
      }
    })
}

/**
 * Test of one array is the subset of the other
 */

function isSubsetOf (a1, a2) {
  if (a1.length > a2.length) return false

  for (var i = 0; i < a1.length; i++) {
    if (a2.indexOf(a1[i]) === -1) return false
  }
  return true
}