/**
 * Copyright 2016 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.
*/

// DO NOT EDIT THIS GENERATED OUTPUT DIRECTLY!
// This file should be overwritten as part of your build process.
// If you need to extend the behavior of the generated service worker, the best approach is to write
// additional code and include it using the importScripts option:
//   https://github.com/GoogleChrome/sw-precache#importscripts-arraystring
//
// Alternatively, it's possible to make changes to the underlying template file and then use that as the
// new base for generating output, via the templateFilePath option:
//   https://github.com/GoogleChrome/sw-precache#templatefilepath-string
//
// If you go that route, make sure that whenever you update your sw-precache dependency, you reconcile any
// changes made to this original template file with your modified copy.

// This generated service worker JavaScript will precache your site's resources.
// The code needs to be saved in a .js file at the top-level of your site, and registered
// from your pages in order to be used. See
// https://github.com/googlechrome/sw-precache/blob/master/demo/app/js/service-worker-registration.js
// for an example of how you can register this script and handle various service worker events.

/* eslint-env worker, serviceworker */
/* eslint-disable indent, no-unused-vars, no-multiple-empty-lines, max-nested-callbacks, space-before-function-paren, quotes, comma-spacing */
'use strict';

var precacheConfig = [["/Contributing/Modules/CompileAndRun.html","d56c0c18391e35ed0d86b3c6b668f79a"],["/Usage/CLI.html","a0333969eb1b171327f4016a5dbf451c"],["/Usage/Configuration.html","f4b4b0796b174beb62948b8c80fd7363"],["/Usage/Install.html","ee494f0c3c4ad33d139e6f3c5113b52f"],["/Usage/index.html","ad4c537f60d4dd0ea998ded7aa4027bd"],["/gitbook/fonts/fontawesome/fontawesome-webfont.eot","25a32416abee198dd821b0b17a198a8f"],["/gitbook/fonts/fontawesome/fontawesome-webfont.svg","d7c639084f684d66a1bc66855d193ed8"],["/gitbook/fonts/fontawesome/fontawesome-webfont.ttf","1dc35d25e61d819a9c357074014867ab"],["/gitbook/fonts/fontawesome/fontawesome-webfont.woff","c8ddf1e5e5bf3682bc7bebf30f394148"],["/gitbook/gitbook-plugin-api/api.css","ad443308d0937629d2811cff9053e0c2"],["/gitbook/gitbook-plugin-api/api.js","b592adcca0c3d691f3a351b05e62c77a"],["/gitbook/gitbook-plugin-code/plugin.css","81aeb06c3e8d1c221773e63fe05f737a"],["/gitbook/gitbook-plugin-code/plugin.js","2a3bab062a1c3446333f10c60e8643a1"],["/gitbook/gitbook-plugin-comment/plugin.css","5291855572a41c85319d21a4b45f2eee"],["/gitbook/gitbook-plugin-comment/plugin.js","dc48b2f0bd1e4bdd1ad03d60d32c9bd6"],["/gitbook/gitbook-plugin-emphasize/plugin.css","6c90145b226c807ebbb334bb7d94d8ee"],["/gitbook/gitbook-plugin-fontsettings/fontsettings.js","fab8f6412ce18bb367635b1bcae503ca"],["/gitbook/gitbook-plugin-fontsettings/website.css","056a6db3eef3553a78f3b7e02356b2e7"],["/gitbook/gitbook-plugin-github/plugin.js","93ff35be0de181d440c84e8f6d76ab45"],["/gitbook/gitbook-plugin-highlight/ebook.css","fa203ae16ad9f01f4d20061fb9e7a6cc"],["/gitbook/gitbook-plugin-highlight/website.css","acce01e3e11cbd4b3882e7732d81f954"],["/gitbook/gitbook-plugin-hints/plugin-hints.css","35cad665bf4ba951a2f3a1d3253b6089"],["/gitbook/gitbook-plugin-livereload/plugin.js","9e48eceeaa9ee3f1f734eddd3dfe04da"],["/gitbook/gitbook-plugin-lunr/lunr.min.js","9424f087f85dc7be8f7c7bc35b720f26"],["/gitbook/gitbook-plugin-lunr/search-lunr.js","4e91f557c3d72be045b9e146c2bc90bc"],["/gitbook/gitbook-plugin-offline/service-worker-registration.js","0b4c35226075896152de214f8860b76e"],["/gitbook/gitbook-plugin-pretty-term/terminal.css","02c933b557fe724dcadd3dfa43dfc33c"],["/gitbook/gitbook-plugin-pretty-term/terminal.js","424e08c8a0b2f3d9e6706f15af29a714"],["/gitbook/gitbook-plugin-search/lunr.min.js","9424f087f85dc7be8f7c7bc35b720f26"],["/gitbook/gitbook-plugin-search/search-engine.js","59ed9456a958a2930326955747048f8a"],["/gitbook/gitbook-plugin-search/search.css","6c8330e8aadd979bb37f872182257bdd"],["/gitbook/gitbook-plugin-search/search.js","5ba7dbf7c0e78b02dc48f83d55729e36"],["/gitbook/gitbook-plugin-sharing/buttons.js","e7c1c051d685b9e7530c1a6675e6b119"],["/gitbook/gitbook.js","e53bf9037b1d1c9810486ef4c5493624"],["/gitbook/images/apple-touch-icon-precomposed-152.png","59313d171157503f5de7fd7e07f3c495"],["/gitbook/style.css","88a3a50e3559bc577c1be0de4fcc6c6d"],["/gitbook/theme.js","176e71ac3bf185b7f08e0f6cb919f1e8"],["/index.html","5447a536c53fe2867b9d030ff8b6ec01"]];
var cacheName = 'sw-precache-v3--' + (self.registration ? self.registration.scope : '');


var ignoreUrlParametersMatching = [/^utm_/];



var addDirectoryIndex = function (originalUrl, index) {
    var url = new URL(originalUrl);
    if (url.pathname.slice(-1) === '/') {
      url.pathname += index;
    }
    return url.toString();
  };

var cleanResponse = function (originalResponse) {
    // If this is not a redirected response, then we don't have to do anything.
    if (!originalResponse.redirected) {
      return Promise.resolve(originalResponse);
    }

    // Firefox 50 and below doesn't support the Response.body stream, so we may
    // need to read the entire body to memory as a Blob.
    var bodyPromise = 'body' in originalResponse ?
      Promise.resolve(originalResponse.body) :
      originalResponse.blob();

    return bodyPromise.then(function(body) {
      // new Response() is happy when passed either a stream or a Blob.
      return new Response(body, {
        headers: originalResponse.headers,
        status: originalResponse.status,
        statusText: originalResponse.statusText
      });
    });
  };

var createCacheKey = function (originalUrl, paramName, paramValue,
                           dontCacheBustUrlsMatching) {
    // Create a new URL object to avoid modifying originalUrl.
    var url = new URL(originalUrl);

    // If dontCacheBustUrlsMatching is not set, or if we don't have a match,
    // then add in the extra cache-busting URL parameter.
    if (!dontCacheBustUrlsMatching ||
        !(url.pathname.match(dontCacheBustUrlsMatching))) {
      url.search += (url.search ? '&' : '') +
        encodeURIComponent(paramName) + '=' + encodeURIComponent(paramValue);
    }

    return url.toString();
  };

var isPathWhitelisted = function (whitelist, absoluteUrlString) {
    // If the whitelist is empty, then consider all URLs to be whitelisted.
    if (whitelist.length === 0) {
      return true;
    }

    // Otherwise compare each path regex to the path of the URL passed in.
    var path = (new URL(absoluteUrlString)).pathname;
    return whitelist.some(function(whitelistedPathRegex) {
      return path.match(whitelistedPathRegex);
    });
  };

var stripIgnoredUrlParameters = function (originalUrl,
    ignoreUrlParametersMatching) {
    var url = new URL(originalUrl);
    // Remove the hash; see https://github.com/GoogleChrome/sw-precache/issues/290
    url.hash = '';

    url.search = url.search.slice(1) // Exclude initial '?'
      .split('&') // Split into an array of 'key=value' strings
      .map(function(kv) {
        return kv.split('='); // Split each 'key=value' string into a [key, value] array
      })
      .filter(function(kv) {
        return ignoreUrlParametersMatching.every(function(ignoredRegex) {
          return !ignoredRegex.test(kv[0]); // Return true iff the key doesn't match any of the regexes.
        });
      })
      .map(function(kv) {
        return kv.join('='); // Join each [key, value] array into a 'key=value' string
      })
      .join('&'); // Join the array of 'key=value' strings into a string with '&' in between each

    return url.toString();
  };


var hashParamName = '_sw-precache';
var urlsToCacheKeys = new Map(
  precacheConfig.map(function(item) {
    var relativeUrl = item[0];
    var hash = item[1];
    var absoluteUrl = new URL(relativeUrl, self.location);
    var cacheKey = createCacheKey(absoluteUrl, hashParamName, hash, false);
    return [absoluteUrl.toString(), cacheKey];
  })
);

function setOfCachedUrls(cache) {
  return cache.keys().then(function(requests) {
    return requests.map(function(request) {
      return request.url;
    });
  }).then(function(urls) {
    return new Set(urls);
  });
}

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(cacheName).then(function(cache) {
      return setOfCachedUrls(cache).then(function(cachedUrls) {
        return Promise.all(
          Array.from(urlsToCacheKeys.values()).map(function(cacheKey) {
            // If we don't have a key matching url in the cache already, add it.
            if (!cachedUrls.has(cacheKey)) {
              var request = new Request(cacheKey, {credentials: 'same-origin'});
              return fetch(request).then(function(response) {
                // Bail out of installation unless we get back a 200 OK for
                // every request.
                if (!response.ok) {
                  throw new Error('Request for ' + cacheKey + ' returned a ' +
                    'response with status ' + response.status);
                }

                return cleanResponse(response).then(function(responseToCache) {
                  return cache.put(cacheKey, responseToCache);
                });
              });
            }
          })
        );
      });
    }).then(function() {
      
      // Force the SW to transition from installing -> active state
      return self.skipWaiting();
      
    })
  );
});

self.addEventListener('activate', function(event) {
  var setOfExpectedUrls = new Set(urlsToCacheKeys.values());

  event.waitUntil(
    caches.open(cacheName).then(function(cache) {
      return cache.keys().then(function(existingRequests) {
        return Promise.all(
          existingRequests.map(function(existingRequest) {
            if (!setOfExpectedUrls.has(existingRequest.url)) {
              return cache.delete(existingRequest);
            }
          })
        );
      });
    }).then(function() {
      
      return self.clients.claim();
      
    })
  );
});


self.addEventListener('fetch', function(event) {
  if (event.request.method === 'GET') {
    // Should we call event.respondWith() inside this fetch event handler?
    // This needs to be determined synchronously, which will give other fetch
    // handlers a chance to handle the request if need be.
    var shouldRespond;

    // First, remove all the ignored parameters and hash fragment, and see if we
    // have that URL in our cache. If so, great! shouldRespond will be true.
    var url = stripIgnoredUrlParameters(event.request.url, ignoreUrlParametersMatching);
    shouldRespond = urlsToCacheKeys.has(url);

    // If shouldRespond is false, check again, this time with 'index.html'
    // (or whatever the directoryIndex option is set to) at the end.
    var directoryIndex = 'index.html';
    if (!shouldRespond && directoryIndex) {
      url = addDirectoryIndex(url, directoryIndex);
      shouldRespond = urlsToCacheKeys.has(url);
    }

    // If shouldRespond is still false, check to see if this is a navigation
    // request, and if so, whether the URL matches navigateFallbackWhitelist.
    var navigateFallback = '';
    if (!shouldRespond &&
        navigateFallback &&
        (event.request.mode === 'navigate') &&
        isPathWhitelisted([], event.request.url)) {
      url = new URL(navigateFallback, self.location).toString();
      shouldRespond = urlsToCacheKeys.has(url);
    }

    // If shouldRespond was set to true at any point, then call
    // event.respondWith(), using the appropriate cache key.
    if (shouldRespond) {
      event.respondWith(
        caches.open(cacheName).then(function(cache) {
          return cache.match(urlsToCacheKeys.get(url)).then(function(response) {
            if (response) {
              return response;
            }
            throw Error('The cached response that was expected is missing.');
          });
        }).catch(function(e) {
          // Fall back to just fetch()ing the request if some unexpected error
          // prevented the cached response from being valid.
          console.warn('Couldn\'t serve response for "%s" from cache: %O', event.request.url, e);
          return fetch(event.request);
        })
      );
    }
  }
});