/*
  Copyright 2014 Google Inc. All Rights Reserved.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/
'use strict';

// TODO: Use self.registration.scope instead of self.location
var url = new URL('./', self.location);
var basePath = url.pathname;
var pathRegexp = require('path-to-regexp');

var Route = function(method, path, handler, options) {
  if (path instanceof RegExp) {
    this.fullUrlRegExp = path;
  } else {
    // The URL() constructor can't parse express-style routes as they are not
    // valid urls. This means we have to manually manipulate relative urls into
    // absolute ones. This check is extremely naive but implementing a tweaked
    // version of the full algorithm seems like overkill
    // (https://url.spec.whatwg.org/#concept-basic-url-parser)
    if (path.indexOf('/') !== 0) {
      path = basePath + path;
    }

    this.keys = [];
    this.regexp = pathRegexp(path, this.keys);
  }

  this.method = method;
  this.options = options;
  this.handler = handler;
};

Route.prototype.makeHandler = function(url) {
  var values;
  if (this.regexp) {
    var match = this.regexp.exec(url);
    values = {};
    this.keys.forEach(function(key, index) {
      values[key.name] = match[index + 1];
    });
  }

  return function(request) {
    return this.handler(request, values, this.options);
  }.bind(this);
};

module.exports = Route;