import {module} from '../module';
import Component from '../lib/component';
import * as resolveFactory from '../lib/resolveDefaultComponents';
import * as normalizerFactory from '../lib/inputAttrsNormalizer';
import './style.scss';
import './textfield.mdl';

export default class Textfield extends Component {
    constructor($element, $scope, $attrs) {
        super($element);

        let input = this.input = this.element.querySelector('input');
        input.addEventListener('input',
            () => this.checkValue());
        input.addEventListener('focus',
            () => this.checkValue());
        input.addEventListener('blur',
            () => this.showClear(false));

        let clearButton = this.element.querySelector('button');
        clearButton.addEventListener('click',
            () => this.onClearClick());
        clearButton.addEventListener('mousedown',
            event => event.preventDefault());

        let div = this.element.firstChild;
        componentHandler.upgradeElement(div);

    }
    link($scope, $attrs) {
        let mdlTextField = this.element.firstChild.MaterialTextfield;
        mdlTextField.updateClasses_();

        $scope.$watch($attrs.model,
            () => mdlTextField.updateClasses_());
    
        let $input = angular.element( this.input);
        $input.controller('ng-model').$parsers.push(value => value === '' ? null : value);
    }
    onClearClick() {
        this.input.value = null;
        this.checkValue();

        let event = this.document.createEvent('HTMLEvents');
        event.initEvent('change', false, true);
        this.input.dispatchEvent(event);
    }
    checkValue() {
        this.showClear(this.input.value);
    }
    showClear(show) {
        show = show && document.activeElement === this.input;
        let clearButton = this.element.querySelector('button');
        clearButton.style.visibility = show ? 'visible' : 'hidden';
    }
    /**
     * Selects the textfield.
     */
    select() {
        this.input.select();
    }
    /**
     * Puts the focus on the textfield.
     */
    focus() {
        this.input.focus();
    }
}
Textfield.$inject = ['$element', '$scope', '$attrs'];

directive.$inject = [resolveFactory.NAME, normalizerFactory.NAME];
export function directive(resolve, normalizer) {
    return {
        restrict: 'E',
        template: function(_, attrs) {
            normalizer.normalize(attrs);
            return resolve.getTemplate('textfield', attrs);
        },
        link: function($scope, $element, $attrs, $ctrl) {
            $ctrl.link($scope, $attrs);
        },
        controller: Textfield
    };
}

module.directive('vnTextfield', directive);