/*
     * Grapnel Router
     * @author Greg Sabia Tucker <greg@narrowlabs.com>
     * @copyright 2019 Greg Sabia Tucker
     * @link https://github.com/baseprime/grapnel
     * Released under MIT License. See http://opensource.org/licenses/MIT
     */
    class MyRouter {
        constructor(opts) {
            var self = this; /* Scope reference */
            this.events = {}; /* Event Listeners */
            this.state = null; /* Router state object */
            this.options = opts || {}; /* Options */
            this.options.env = this.options.env || (!!(Object.keys(root).length === 0 && process && process.browser !== true) ? 'server' : 'client');
            this.options.mode = this.options.mode || (!!(this.options.env !== 'server' && this.options.pushState && root.history && root.history.pushState) ? 'pushState' : 'hashchange');
            if ('function' === typeof root.addEventListener) {
                root.addEventListener('hashchange', function () {
                    self.trigger('hashchange');
                });
                root.addEventListener('popstate', function (e) {
                    /* Make sure popstate doesn't run on init -- this is a common issue with Safari and old versions of Chrome */
                    if (self.state && self.state.previousState === null) {
                        return false;
                    }
                    self.trigger('navigate');
                });
            }
            return this;
        }
    }
    /**
     * Create a RegExp Route from a string
     * This is the heart of the router and I've made it as small as possible!
     * @param {String} path - Path of route
     * @param {Array} keys - Array of keys to fill
     * @param {Bool} sensitive - Case sensitive comparison
     * @param {Bool} strict - Strict mode
     */
    MyRouter.regexRoute = function (path, keys, sensitive, strict) {
        if (path instanceof RegExp) {
            return path;
        }
        if (path instanceof Array) {
            path = '(' + path.join('|') + ')';
        }
        /* Build route RegExp */
        path = path.concat(strict ? '' : '/?')
                .replace(/\/\(/g, '(?:/')
                .replace(/\+/g, '__plus__')
                .replace(/(\/)?(\.)?:(\w+)(?:(\(.*?\)))?(\?)?/g, function (_, slash, format, key, capture, optional) {
                    keys.push({name: key, optional: !!optional});
                    slash = slash || '';
                    return '' + (optional ? '' : slash) + '(?:' + (optional ? slash : '') + (format || '') + (capture || (format && '([^/.]+?)' || '([^/]+?)')) + ')' + (optional || '');
                })
                .replace(/([\/.])/g, '\\$1')
                .replace(/__plus__/g, '(.+)')
                .replace(/\*/g, '(.*)');
        return new RegExp('^' + path + '$', sensitive ? '' : 'i');
    };
    /**
     * ForEach workaround utility
     * @param {Array} a - to iterate
     * @param {Function} callback
     */
    MyRouter._forEach = function (a, callback) {
        if (typeof Array.prototype.forEach === 'function') {
            return Array.prototype.forEach.call(a, callback);
        }
        /* Replicate forEach() */
        return function (c, next) {
            for (var i = 0, n = this.length; i < n; ++i) {
                c.call(next, this[i], i, this);
            }
        }.call(a, callback);
    };
    /**
     * Add an route and handler
     * @param {String|RegExp} route name
     * @return {self} Router
     */
    MyRouter.prototype.get = MyRouter.prototype.add = function (route) {
        var self = this, middleware = Array.prototype.slice.call(arguments, 1, -1),
                handler = Array.prototype.slice.call(arguments, -1)[0], request = new Request(route);
        var invoke = function RouteHandler() {
            /* Build request parameters */
            var req = request.parse(self.path());
            /* Check if matches are found */
            if (req.match) {
                /* Match found */
                var extra = {route: route, params: req.params, req: req, regex: req.match};
                /* Create call stack -- add middleware first, then handler */
                var stack = new CallStack(self, extra).enqueue(middleware.concat(handler));
                /* Trigger main event */
                self.trigger('match', stack, req);
                /* Continue */
                if (!stack.runCallback) {
                    return self;
                }
                /* Previous state becomes current state */
                stack.previousState = self.state;
                /* Save new state */
                self.state = stack;
                /* Prevent this handler from being called if parent handler in stack has instructed not to propagate any more events */
                if (stack.parent() && stack.parent().propagateEvent === false) {
                    stack.propagateEvent = false;
                    return self;
                }
                /* Call handler */
                stack.callback();
            }
            /* Returns self */
            return self;
        };
        /* Event name */
        var eventName = (self.options.mode !== 'pushState' && self.options.env !== 'server') ? 'hashchange' : 'navigate';
        /* Invoke when route is defined, and once again when app navigates */
        return invoke().on(eventName, invoke);
    };
    /**
     * Fire an event listener
     * @param {String} event name
     * @param {Mixed} [attributes] Parameters that will be applied to event handler
     * @return {self} Router
     */
    MyRouter.prototype.trigger = function (event) {
        var self = this, params = Array.prototype.slice.call(arguments, 1);
        /* Call matching events */
        if (this.events[event]) {
            MyRouter._forEach(this.events[event], function (fn) {
                fn.apply(self, params);
            });
        }
        return this;
    };
    /**
     * Add an event listener
     * @param {String} event name (multiple events can be called when separated by a space " ")
     * @param {Function} handler - callback
     * @return {self} Router
     */
    MyRouter.prototype.on = MyRouter.prototype.bind = function (event, handler) {
        var self = this, events = event.split(' ');
        MyRouter._forEach(events, function (event) {
            if (self.events[event]) {
                self.events[event].push(handler);
            } else {
                self.events[event] = [handler];
            }
        });
        return this;
    };
    /**
     * Allow event to be called only once
     * @param {String} event name(s)
     * @param {Function} handler - callback
     * @return {self} Router
     */
    MyRouter.prototype.once = function (event, handler) {
        var ran = false;
        return this.on(event, function () {
            if (ran) {
                return false;
            }
            ran = true;
            handler.apply(this, arguments);
            handler = null;
            return true;
        });
    };
    /**
     * @param {String} context - Route context (without trailing slash)
     * param {[Function]} Middleware (optional)
     * @return {Function} Adds route to context
     */
    MyRouter.prototype.context = function (context) {
        var self = this, middleware = Array.prototype.slice.call(arguments, 1);
        return function () {
            var value = arguments[0],
                    submiddleware = (arguments.length > 2) ? Array.prototype.slice.call(arguments, 1, -1) : [],
                    handler = Array.prototype.slice.call(arguments, -1)[0],
                    prefix = (context.slice(-1) !== '/' && value !== '/' && value !== '') ? context + '/' : context,
                    path = (value.substr(0, 1) !== '/') ? value : value.substr(1),
                    pattern = prefix + path;
            return self.add.apply(self, [pattern].concat(middleware).concat(submiddleware).concat([handler]));
        };
    };
    /**
     * Navigate through history API
     * @param {String} path - Pathname
     * @return {self} Router
     */
    MyRouter.prototype.navigate = function (path) {
        return this.path(path).trigger('navigate');
    };
    MyRouter.prototype.path = function (pathname) {
        var self = this, frag;
        if ('string' === typeof pathname) {
            /* Set path */
            if (self.options.mode === 'pushState') {
                frag = (self.options.root) ? (self.options.root + pathname) : pathname;
                root.history.pushState({}, null, frag);
            } else if (root.location) {
                root.location.hash = (self.options.hashBang ? '!' : '') + pathname;
            } else {
                root._pathname = pathname || '';
            }
            return this;
        } else if ('undefined' === typeof pathname) {
            /* Get path */
            if (self.options.mode === 'pushState') {
                frag = root.location.pathname.replace(self.options.root, '');
            } else if (self.options.mode !== 'pushState' && root.location) {
                frag = (root.location.hash) ? root.location.hash.split((self.options.hashBang ? '#!' : '#'))[1] : '';
            } else {
                frag = root._pathname || '';
            }
            return frag;
        } else if (pathname === false) {
            /* Clear path */
            if (self.options.mode === 'pushState') {
                root.history.pushState({}, null, self.options.root || '/');
            } else if (root.location) {
                root.location.hash = (self.options.hashBang) ? '!' : '';
            }
            return self;
        }
    };
    /**
     * Create routes based on an object
     * @param {Object} [Options, Routes]
     * @param {Object Routes}
     * @return {self} Router
     */
    MyRouter.listen = function () {
        var opts, routes;
        if (arguments[0] && arguments[1]) {
            opts = arguments[0];
            routes = arguments[1];
        } else {
            routes = arguments[0];
        }
        /* Return a new MyRouter instance */
        return (function () {
            /* TODO: Accept multi-level routes */
            for (var key in routes) {
                this.add.call(this, key, routes[key]);
            }
            return this;
        }).call(new MyRouter(opts || {}));
    };
    /**
     * Create a call stack that can be enqueued by handlers and middleware
     * @param {Object} router - Router
     * @param {Object} extendObj - Extend
     * @return {self} CallStack
     */
    class CallStack {
        constructor(router, extendObj) {
            this.stack = CallStack.global.slice(0);
            this.router = router;
            this.runCallback = true;
            this.callbackRan = false;
            this.propagateEvent = true;
            this.value = router.path();
            for (var key in extendObj) {
                this[key] = extendObj[key];
            }
            return this;
        }
    }
    /**
     * Build request parameters and allow them to be checked against a string (usually the current path)
     * @param {String} route - Route
     * @return {self} Request 
     */
    function Request(route) {
        this.route = route;
        this.keys = [];
        this.regex = MyRouter.regexRoute(route, this.keys);
    }
    ;
    /* This allows global middleware */
    CallStack.global = [];
    /**
     * Prevent a callback from being called
     * @return {self} CallStack 
     */
    CallStack.prototype.preventDefault = function () {
        this.runCallback = false;
    };
    /**
     * Prevent any future callbacks from being called
     * @return {self} CallStack 
     */
    CallStack.prototype.stopPropagation = function () {
        this.propagateEvent = false;
    };
    /**
     * Get parent state
     * @return {Object} Previous state 
     */
    CallStack.prototype.parent = function () {
        var hasParentEvents = !!(this.previousState && this.previousState.value && this.previousState.value == this.value);
        return (hasParentEvents) ? this.previousState : false;
    };
    /**
     * Run a callback (calls to next)
     * @return {self} CallStack 
     */
    CallStack.prototype.callback = function () {
        this.callbackRan = true;
        this.timeStamp = Date.now();
        this.next();
    };
    /**
     * Add handler or middleware to the stack
     * @param {Function|Array} handler - Handler or a array of handlers
     * @param {Int} atIndex - Index to start inserting
     * @return {self} CallStack 
     */
    CallStack.prototype.enqueue = function (handler, atIndex) {
        var handlers = (!Array.isArray(handler)) ? [handler] : ((atIndex < handler.length) ? handler.reverse() : handler);
        while (handlers.length) {
            this.stack.splice(atIndex || this.stack.length + 1, 0, handlers.shift());
        }
        return this;
    };
    /**
     * Call to next item in stack -- this adds the `req`, `event`, and `next()` arguments to all middleware
     * @return {self} CallStack 
     */
    CallStack.prototype.next = function () {
        var self = this;
        return this.stack.shift().call(this.router, this.req, this, function next() {
            self.next.call(self);
        });
    };
    /**
     * Match a path string -- returns a request object if there is a match -- returns false otherwise
     * @param {String} path 
     * @return {Object} req
     */
    Request.prototype.parse = function (path) {
        var match = path.match(this.regex), self = this;
        var req = {params: {}, keys: this.keys, matches: (match || []).slice(1), match: match};
        /* Build parameters */
        MyRouter._forEach(req.matches, function (value, i) {
            var key = (self.keys[i] && self.keys[i].name) ? self.keys[i].name : i;
            /* Parameter key will be its key or the iteration index. This is useful if a wildcard (*) is matched */
            req.params[key] = (value) ? decodeURIComponent(value) : undefined;
        });
        return req;
    };

    MyRouter.CallStack = CallStack;
    MyRouter.Request = Request;
    tts.Router = new MyRouter();

    /* 
     * End of MyRouter Router 
     */