import ngModule from '../module';
import EventEmitter from './event-emitter';
import {kebabToCamel} from './string';

/**
 * Base class for component controllers.
 */
export default class Component extends EventEmitter {
    /**
     * Contructor.
     *
     * @param {HTMLElement} $element The main component element
     * @param {$rootScope.Scope} $scope The element scope
     */
    constructor($element, $scope) {
        super();
        if (!$element) return;
        this.element = $element[0];
        this.element.$ctrl = this;
        this.$element = $element;
        this.$ = $scope;
    }

    $postLink() {
        if (!this.$element) return;
        let attrs = this.$element[0].attributes;
        let $scope = this.$;
        for (let attr of attrs) {
            if (attr.name.substr(0, 2) !== 'on') continue;
            let eventName = kebabToCamel(attr.name.substr(3));
            let callback = locals => $scope.$parent.$eval(attr.nodeValue, locals);
            this.on(eventName, callback);
        }
    }

    /**
     * The component owner window.
     */
    get window() {
        return this.document.defaultView;
    }

    /**
     * The component owner document.
     */
    get document() {
        return this.element.ownerDocument;
    }

    /**
     * Translates an string.
     *
     * @param {String} string String to translate
     * @param {Array} params Translate parameters
     * @return {String} The translated string
     */
    $t(string, params) {
        return this.$translate.instant(string, params);
    }

    createBoundTranscludeFn(linkFn) {
        let scope = this.$;
        let previousBoundTranscludeFn = this.$transclude.$$boundTransclude;

        function vnBoundTranscludeFn(transcludedScope, cloneFn, controllers, futureParentElement, containingScope) {
            if (!transcludedScope) {
                transcludedScope = scope.$new(false, containingScope);
                transcludedScope.$$transcluded = true;
            }
            return linkFn(transcludedScope, cloneFn, {
                parentBoundTranscludeFn: previousBoundTranscludeFn,
                transcludeControllers: controllers,
                futureParentElement: futureParentElement
            });
        }
        vnBoundTranscludeFn.$$slots = previousBoundTranscludeFn.$$slots;

        return vnBoundTranscludeFn;
    }

    fillDefaultSlot(template) {
        let linkFn = this.$compile(template);
        this.$transclude.$$boundTransclude = this.createBoundTranscludeFn(linkFn);
    }

    fillSlot(slot, template) {
        let slots = this.$transclude.$$boundTransclude.$$slots;
        let linkFn = this.$compile(template);
        slots[slot] = this.createBoundTranscludeFn(linkFn);
    }

    copySlot(slot, $transclude) {
        this.$transclude.$$boundTransclude.$$slots[slot] =
            $transclude.$$boundTransclude.$$slots[slot];
    }
}
Component.$inject = ['$element', '$scope'];

function runFn(
    $translate,
    $q,
    $http,
    $state,
    $stateParams,
    $timeout,
    $transitions,
    $compile,
    $filter,
    $interpolate,
    vnApp) {
    Object.assign(Component.prototype, {
        $translate,
        $q,
        $http,
        $state,
        $params: $stateParams,
        $timeout,
        $transitions,
        $compile,
        $filter,
        $interpolate,
        vnApp
    });
}
runFn.$inject = [
    '$translate',
    '$q',
    '$http',
    '$state',
    '$stateParams',
    '$timeout',
    '$transitions',
    '$compile',
    '$filter',
    '$interpolate',
    'vnApp'
];

ngModule.run(runFn);