/**
 * OKQuery!
 * Takes configuration and gives you something that can run a DB query
 * based on the configurations.
 */
function OKQuery(db, options) {
  if (!(this instanceof OKQuery)) return new OKQuery(db, options);
  options = options || {};
  if (!db)
    throw new Error('No DB provided to query.');
  if (!options.name)
    throw new Error('No name type provided to query');
  this.name = options.name;
  this.get = createQuery(db, options);
}

function createQuery(db, config) {
  var name = config.name;
  var id = config.id || '*';
  if (isDynamic(id)) {
    return queryDynamic(db, name);
  } else if (isSet(id)) {
    return queryAll(db, name);
  } else {
    return querySingle(db, name, id);
  }
}

function queryDynamic(db, name) {
  return function(options) {
    options = options || {};
    return db.get(name, options.id);
  }
}

function queryAll(db, name) {
  return function() {
    return db.getAll(name);
  }
}

function querySingle(db, name, id) {
  return function() {
    return db.get(name, id);
  }
}

function isDynamic(id) {
  return id && id.charAt(0) === ':';
}

function isSet(id) {
  return id && id === '*';
}

module.exports = OKQuery;