import {html} from 'lit-element';
import {LanguageSelect} from './language-select.js';
import * as commonUtils from '@dbp-toolkit/common/utils';
import { ScopedElementsMixin } from '@open-wc/scoped-elements';
import {AdapterLitElement} from "@dbp-toolkit/provider/src/adapter-lit-element";
import {Provider} from "@dbp-toolkit/provider";
import {i18n} from './i18n.js';

// This is an example on how to override translations at runtime
let OVERRIDES = {
    'de': {
        'translation': {
            'demo': 'Überschrieben'
        }
    },
    'en': {
        'translation': {
            'demo': 'Overridden'
        }
    }
};

function applyOverrides(i18n, namespace, overrides) {
    for(let lang of Object.keys(overrides)) {
        let data = overrides[lang][namespace];
        if (data !== undefined) {
            i18n.addResourceBundle(lang, namespace + '-override', data);
        }
    }
}

class LanguageSelectDisplay extends AdapterLitElement {

    constructor() {
        super();
        this.lang = 'de';
        this._i18n = i18n.cloneInstance();
        // FIXME: this overrides the translations for all clones
        applyOverrides(this._i18n, 'translation', OVERRIDES);
    }

    static get properties() {
        return {
            lang: {type: String},
        };
    }

    update(changedProperties) {
        changedProperties.forEach((oldValue, propName) => {
            switch (propName) {
                case 'lang':
                    this._i18n.changeLanguage(this.lang);
            }
        });
        super.update(changedProperties);
    }

    render() {
        return html`<b>${this.lang}: ${this._i18n.t('demo')}</b>`;
    }
}

export class LanguageSelectDemo extends ScopedElementsMixin(AdapterLitElement) {

    constructor() {
        super();
    }

    static get scopedElements() {
        return {
          'dbp-language-select': LanguageSelect,
          'dbp-language-select-display': LanguageSelectDisplay,
          'dbp-provider': Provider,
        };
      }

    render() {
        return html`
            <dbp-provider lang="">
                Select 1: <dbp-language-select subscribe="lang"></dbp-language-select>
                <br>
                <br>
                Select 2: <dbp-language-select subscribe="lang"></dbp-language-select>
                <br>
                <br>
                Current language 1: <dbp-language-select-display subscribe="lang"></dbp-language-select-display>
                <br>
                <br>
                Current language 2: <dbp-language-select-display subscribe="lang"></dbp-language-select-display>
            </dbp-provider>
        `;
    }
}

commonUtils.defineCustomElement('dbp-language-select-demo', LanguageSelectDemo);