class KeyBinding {

    constructor() {

        this._searchBox = document.querySelector('#searchBox');

        this._keysPressed = {};

        this._documentAddKeyDownEvent = this._documentAddKeyDownEvent.bind(this);
        this._documentAddKeyUpEvent = this._documentAddKeyUpEvent.bind(this);

        this._registerDocumentAddKeyDownEvent();
        this._registerDocumentAddKeyUpEvent();
    }

    _documentAddKeyDownEvent = e => {

        const searchBoxVisibility = searchBoxShow.getSearchBoxVisibility();

        this._keysPressed[e.key] = true;


        if (this._keysPressed['Alt'] && e.key === 's') {

            e.preventDefault();
            dashboard.toggleDashboard();
            return;

        } else if (this._keysPressed['Alt'] && e.key === 'e') {

            e.preventDefault();
            webMenu.toggleWebMenu();
            return;

        } else if (this._keysPressed['Alt'] && e.key === 'x') {

            e.preventDefault();
            weatherScreen.toggleWeatherScreen();
            return;

        }

        if (e.key === 'Escape') {

            e.preventDefault();
            
            // If any of this are open, close it
            if (searchBoxVisibility) {
                
                // Hide searchbox
                searchBoxShow.toggleSearchBox();
                this._searchBox.value = '';
                return;

            } else if (dashboard.getRightDashboardVisibility()) {
                
                // Hide dashboard
                dashboard.toggleDashboard();
                return;
                
            } else if (weatherScreen.getWeatherScreenVisiblity()) {
                
                // Hide weather
                weatherScreen.toggleWeatherScreen();
                return;

            }

            // Show web menu
            webMenu.toggleWebMenu();
            return;
        }

        if (searchBoxVisibility === false) {

            // Don't show searchbox when web menu, dashboard
            // and weather screen is open
            if (dashboard.getRightDashboardVisibility() ||
                webMenu.getwebMenuVisibility() ||
                weatherScreen.getWeatherScreenVisiblity()) return;

            // Only accept single charactered key and backspace to open search box
            if ((e.key.length > 1) && (e.key !== 'Backspace')) return;

            // Open searchbox
            searchBoxShow.toggleSearchBox();

        }  else {
            
            // Backspacing while there's no search query will hide searhbox
            // Will also hide if you hit enter
            if ((e.key === 'Backspace' || e.key === 'Enter') && 
                this._searchBox.value < 1) { searchBoxShow.toggleSearchBox(); return; };
        }

    }

    _documentAddKeyUpEvent = e => {
        delete this._keysPressed[e.key];
    }

    _registerDocumentAddKeyDownEvent = () => {
        document.addEventListener('keydown', this._documentAddKeyDownEvent);
    }

    _registerDocumentAddKeyUpEvent = () => {
        document.addEventListener('keyup', this._documentAddKeyUpEvent);
    }
}