import {ng, ngDeps} from './vendor';
import {camelToKebab} from './lib/string';

const ngModule = ng.module('vnCore', ngDeps);
export default ngModule;

/**
 * Acts like native Module.component() function but merging component options
 * with parent component options. This method establishes the $options property
 * to the component controller class with the merged component options. To
 * retrieve parent options, it reads the same property of the parent class, so
 * for the parent options to be copied, it must have been declared using this
 * same function. If any of the options (template, transclude, bindings...) is
 * redeclared in the child component, the last has preference.
 *
 * @param {String} name Coponent name in camelCase
 * @param {Object} options The component options
 * @return {angularModule} The same angular module
 */
ngModule.vnComponent = function(name, options) {
    let controller = options.controller;
    let parent = Object.getPrototypeOf(controller);
    let parentOptions = parent.$options || {};

    let parentTransclude = parentOptions.transclude;
    let transclude = parentTransclude instanceof Object
        ? Object.assign({}, parentTransclude)
        : parentTransclude;

    if (options.transclude instanceof Object) {
        if (transclude instanceof Object)
            Object.assign(transclude, options.transclude);
        else
            transclude = options.transclude;
    } else if (options.transclude !== undefined)
        transclude = options.transclude;

    let mergedOptions = Object.assign({},
        parentOptions,
        options,
        {
            transclude,
            bindings: Object.assign({},
                parentOptions.bindings,
                options.bindings
            ),
            require: Object.assign({},
                parentOptions.require,
                options.require
            )
        }
    );
    controller.$options = mergedOptions;

    let classNames = [camelToKebab(name)];
    if (parent.$classNames) classNames = classNames.concat(parent.$classNames);
    controller.$classNames = classNames;

    return this.component(name, mergedOptions);
};

config.$inject = ['$translateProvider', '$translatePartialLoaderProvider'];
export function config($translateProvider, $translatePartialLoaderProvider) {
    // For CSS browser targeting
    document.documentElement.setAttribute('data-browser', navigator.userAgent);

    $translatePartialLoaderProvider.addPart('core');

    let conf = {urlTemplate: '/locale/{part}/{lang}.json'};

    let fallbackLang = 'es';
    let langs = ['en', 'es'];
    let langAliases = {
        en_US: 'en',
        en_UK: 'en',
        es_ES: 'es',
        es_AR: 'es'
    };

    $translateProvider
        .useSanitizeValueStrategy('escape')
        .useLoader('$translatePartialLoader', conf)
        .registerAvailableLanguageKeys(langs, langAliases)
        // FIXME: Circular dependency due to vnInterceptor
        // .fallbackLanguage(fallbackLang)
        .determinePreferredLanguage(() => {
            let locale = $translateProvider.resolveClientLocale();
            if (langs.indexOf(locale) !== -1)
                return locale;
            if (langAliases[locale])
                return langAliases[locale];
            return fallbackLang;
        });
}
ngModule.config(config);