/*
  Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/
import { assert } from 'workbox-core/_private/assert.js';
import { logger } from 'workbox-core/_private/logger.js';
import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
import { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';
import { normalizeHandler } from './utils/normalizeHandler.js';
import './_version.js';
/**
 * The Router can be used to process a FetchEvent through one or more
 * [Routes]{@link module:workbox-routing.Route} responding  with a Request if
 * a matching route exists.
 *
 * If no route matches a given a request, the Router will use a "default"
 * handler if one is defined.
 *
 * Should the matching Route throw an error, the Router will use a "catch"
 * handler if one is defined to gracefully deal with issues and respond with a
 * Request.
 *
 * If a request matches multiple routes, the **earliest** registered route will
 * be used to respond to the request.
 *
 * @memberof module:workbox-routing
 */
class Router {
    /**
     * Initializes a new Router.
     */
    constructor() {
        this._routes = new Map();
    }
    /**
     * @return {Map<string, Array<module:workbox-routing.Route>>} routes A `Map` of HTTP
     * method name ('GET', etc.) to an array of all the corresponding `Route`
     * instances that are registered.
     */
    get routes() {
        return this._routes;
    }
    /**
     * Adds a fetch event listener to respond to events when a route matches
     * the event's request.
     */
    addFetchListener() {
        // See https://github.com/Microsoft/TypeScript/issues/28357#issuecomment-436484705
        self.addEventListener('fetch', ((event) => {
            const { request } = event;
            const responsePromise = this.handleRequest({ request, event });
            if (responsePromise) {
                event.respondWith(responsePromise);
            }
        }));
    }
    /**
     * Adds a message event listener for URLs to cache from the window.
     * This is useful to cache resources loaded on the page prior to when the
     * service worker started controlling it.
     *
     * The format of the message data sent from the window should be as follows.
     * Where the `urlsToCache` array may consist of URL strings or an array of
     * URL string + `requestInit` object (the same as you'd pass to `fetch()`).
     *
     * ```
     * {
     *   type: 'CACHE_URLS',
     *   payload: {
     *     urlsToCache: [
     *       './script1.js',
     *       './script2.js',
     *       ['./script3.js', {mode: 'no-cors'}],
     *     ],
     *   },
     * }
     * ```
     */
    addCacheListener() {
        // See https://github.com/Microsoft/TypeScript/issues/28357#issuecomment-436484705
        self.addEventListener('message', ((event) => {
            if (event.data && event.data.type === 'CACHE_URLS') {
                const { payload } = event.data;
                if (process.env.NODE_ENV !== 'production') {
                    logger.debug(`Caching URLs from the window`, payload.urlsToCache);
                }
                const requestPromises = Promise.all(payload.urlsToCache.map((entry) => {
                    if (typeof entry === 'string') {
                        entry = [entry];
                    }
                    const request = new Request(...entry);
                    return this.handleRequest({ request });
                    // TODO(philipwalton): TypeScript errors without this typecast for
                    // some reason (probably a bug). The real type here should work but
                    // doesn't: `Array<Promise<Response> | undefined>`.
                })); // TypeScript
                event.waitUntil(requestPromises);
                // If a MessageChannel was used, reply to the message on success.
                if (event.ports && event.ports[0]) {
                    requestPromises.then(() => event.ports[0].postMessage(true));
                }
            }
        }));
    }
    /**
     * Apply the routing rules to a FetchEvent object to get a Response from an
     * appropriate Route's handler.
     *
     * @param {Object} options
     * @param {Request} options.request The request to handle (this is usually
     *     from a fetch event, but it does not have to be).
     * @param {FetchEvent} [options.event] The event that triggered the request,
     *     if applicable.
     * @return {Promise<Response>|undefined} A promise is returned if a
     *     registered route can handle the request. If there is no matching
     *     route and there's no `defaultHandler`, `undefined` is returned.
     */
    handleRequest({ request, event }) {
        if (process.env.NODE_ENV !== 'production') {
            assert.isInstance(request, Request, {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'handleRequest',
                paramName: 'options.request',
            });
        }
        const url = new URL(request.url, location.href);
        if (!url.protocol.startsWith('http')) {
            if (process.env.NODE_ENV !== 'production') {
                logger.debug(`Workbox Router only supports URLs that start with 'http'.`);
            }
            return;
        }
        const { params, route } = this.findMatchingRoute({ url, request, event });
        let handler = route && route.handler;
        const debugMessages = [];
        if (process.env.NODE_ENV !== 'production') {
            if (handler) {
                debugMessages.push([
                    `Found a route to handle this request:`, route,
                ]);
                if (params) {
                    debugMessages.push([
                        `Passing the following params to the route's handler:`, params,
                    ]);
                }
            }
        }
        // If we don't have a handler because there was no matching route, then
        // fall back to defaultHandler if that's defined.
        if (!handler && this._defaultHandler) {
            if (process.env.NODE_ENV !== 'production') {
                debugMessages.push(`Failed to find a matching route. Falling ` +
                    `back to the default handler.`);
            }
            handler = this._defaultHandler;
        }
        if (!handler) {
            if (process.env.NODE_ENV !== 'production') {
                // No handler so Workbox will do nothing. If logs is set of debug
                // i.e. verbose, we should print out this information.
                logger.debug(`No route found for: ${getFriendlyURL(url)}`);
            }
            return;
        }
        if (process.env.NODE_ENV !== 'production') {
            // We have a handler, meaning Workbox is going to handle the route.
            // print the routing details to the console.
            logger.groupCollapsed(`Router is responding to: ${getFriendlyURL(url)}`);
            debugMessages.forEach((msg) => {
                if (Array.isArray(msg)) {
                    logger.log(...msg);
                }
                else {
                    logger.log(msg);
                }
            });
            logger.groupEnd();
        }
        // Wrap in try and catch in case the handle method throws a synchronous
        // error. It should still callback to the catch handler.
        let responsePromise;
        try {
            responsePromise = handler.handle({ url, request, event, params });
        }
        catch (err) {
            responsePromise = Promise.reject(err);
        }
        if (responsePromise instanceof Promise && this._catchHandler) {
            responsePromise = responsePromise.catch((err) => {
                if (process.env.NODE_ENV !== 'production') {
                    // Still include URL here as it will be async from the console group
                    // and may not make sense without the URL
                    logger.groupCollapsed(`Error thrown when responding to: ` +
                        ` ${getFriendlyURL(url)}. Falling back to Catch Handler.`);
                    logger.error(`Error thrown by:`, route);
                    logger.error(err);
                    logger.groupEnd();
                }
                return this._catchHandler.handle({ url, request, event });
            });
        }
        return responsePromise;
    }
    /**
     * Checks a request and URL (and optionally an event) against the list of
     * registered routes, and if there's a match, returns the corresponding
     * route along with any params generated by the match.
     *
     * @param {Object} options
     * @param {URL} options.url
     * @param {Request} options.request The request to match.
     * @param {Event} [options.event] The corresponding event (unless N/A).
     * @return {Object} An object with `route` and `params` properties.
     *     They are populated if a matching route was found or `undefined`
     *     otherwise.
     */
    findMatchingRoute({ url, request, event }) {
        if (process.env.NODE_ENV !== 'production') {
            assert.isInstance(url, URL, {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'findMatchingRoute',
                paramName: 'options.url',
            });
            assert.isInstance(request, Request, {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'findMatchingRoute',
                paramName: 'options.request',
            });
        }
        const routes = this._routes.get(request.method) || [];
        for (const route of routes) {
            let params;
            const matchResult = route.match({ url, request, event });
            if (matchResult) {
                // See https://github.com/GoogleChrome/workbox/issues/2079
                params = matchResult;
                if (Array.isArray(matchResult) && matchResult.length === 0) {
                    // Instead of passing an empty array in as params, use undefined.
                    params = undefined;
                }
                else if ((matchResult.constructor === Object &&
                    Object.keys(matchResult).length === 0)) {
                    // Instead of passing an empty object in as params, use undefined.
                    params = undefined;
                }
                else if (typeof matchResult === 'boolean') {
                    // For the boolean value true (rather than just something truth-y),
                    // don't set params.
                    // See https://github.com/GoogleChrome/workbox/pull/2134#issuecomment-513924353
                    params = undefined;
                }
                // Return early if have a match.
                return { route, params };
            }
        }
        // If no match was found above, return and empty object.
        return {};
    }
    /**
     * Define a default `handler` that's called when no routes explicitly
     * match the incoming request.
     *
     * Without a default handler, unmatched requests will go against the
     * network as if there were no service worker present.
     *
     * @param {module:workbox-routing~handlerCallback} handler A callback
     * function that returns a Promise resulting in a Response.
     */
    setDefaultHandler(handler) {
        this._defaultHandler = normalizeHandler(handler);
    }
    /**
     * If a Route throws an error while handling a request, this `handler`
     * will be called and given a chance to provide a response.
     *
     * @param {module:workbox-routing~handlerCallback} handler A callback
     * function that returns a Promise resulting in a Response.
     */
    setCatchHandler(handler) {
        this._catchHandler = normalizeHandler(handler);
    }
    /**
     * Registers a route with the router.
     *
     * @param {module:workbox-routing.Route} route The route to register.
     */
    registerRoute(route) {
        if (process.env.NODE_ENV !== 'production') {
            assert.isType(route, 'object', {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'registerRoute',
                paramName: 'route',
            });
            assert.hasMethod(route, 'match', {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'registerRoute',
                paramName: 'route',
            });
            assert.isType(route.handler, 'object', {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'registerRoute',
                paramName: 'route',
            });
            assert.hasMethod(route.handler, 'handle', {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'registerRoute',
                paramName: 'route.handler',
            });
            assert.isType(route.method, 'string', {
                moduleName: 'workbox-routing',
                className: 'Router',
                funcName: 'registerRoute',
                paramName: 'route.method',
            });
        }
        if (!this._routes.has(route.method)) {
            this._routes.set(route.method, []);
        }
        // Give precedence to all of the earlier routes by adding this additional
        // route to the end of the array.
        this._routes.get(route.method).push(route);
    }
    /**
     * Unregisters a route with the router.
     *
     * @param {module:workbox-routing.Route} route The route to unregister.
     */
    unregisterRoute(route) {
        if (!this._routes.has(route.method)) {
            throw new WorkboxError('unregister-route-but-not-found-with-method', {
                method: route.method,
            });
        }
        const routeIndex = this._routes.get(route.method).indexOf(route);
        if (routeIndex > -1) {
            this._routes.get(route.method).splice(routeIndex, 1);
        }
        else {
            throw new WorkboxError('unregister-route-route-not-registered');
        }
    }
}
export { Router };