"use strict";

import React, {Component} from 'react';

import {NavigationActions, StackActions} from 'react-navigation';

export default BareNavigator => {
    let navigator, state;
    const refNavigator = me => navigator = me;
    const refState = (prevState, newState) => state = newState;

    class Navigator extends Component {
        render () {
            return <BareNavigator
                ref={refNavigator}
                onNavigationStateChange={refState}
            />;
        }
    }

    const {navigate, back} = NavigationActions;
    const {reset} = StackActions;

    const topOfNavigationStack = () => state.routes[state.routes.length - 1] || {};
    const isRoute = expected => ({routeName}) => routeName === expected;
    const isTopRoute = expected => isRoute(expected)(topOfNavigationStack());

    const navigationHelpers = {
        topOfNavigationStack,

        navigate: (...args) => navigator.dispatch(navigate(...args)),
        back: (...args) => navigator.dispatch(back(...args)),
        reset: (...args) => navigator.dispatch(reset(...args)),

        resetRoutes: routeNames => navigator.dispatch(reset({
            actions: routeNames.map(routeName => navigate({routeName})),
            index: routeNames.length - 1
        })),

        isRoute,

        isTopRoute,

        goBackFrom: routeName => {
            if (isTopRoute(routeName)) {
                navigator.dispatch(back());
            }
        },
    };

    return {Navigator, navigationHelpers};
};