/*
Copyright 2020 DigitalOcean

This code is licensed under the MIT License.
You may obtain a copy of the License at
https://github.com/digitalocean/nginxconfig.io/blob/master/LICENSE or https://mit-license.org/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

import browserLanguage from '../src/nginxconfig/util/browser_language';

class MockLocales {
    static languages = [];

    static language = null;

    static IntlBackup = null;

    static navigator = null;

    static setNavigatorLanguages(langs) {
        MockLocales.languages = langs;
        return this;
    }

    static setNavigatorLanguage(lang) {
        MockLocales.language = lang;
        return this;
    }

    static setDateTimeLocale(locale) {
        const newDateTimeFormat = new Intl.DateTimeFormat(locale);
        MockLocales.IntlBackup = Intl;
        if (!locale) {
            // eslint-disable-next-line no-global-assign
            Intl = undefined;
            return this;
        }

        // eslint-disable-next-line no-global-assign
        Intl = {
            DateTimeFormat() {
                return newDateTimeFormat;
            },
        };
        return this;
    }

    static restoreDateTimeLocale() {
        // eslint-disable-next-line no-global-assign
        Intl = MockLocales.IntlBackup;
        MockLocales.IntlBackup = null;
        return this;
    }

    static setNavigator(navigator) {
        MockLocales.navigator = window.navigator;
        window.navigator = navigator;
        return this;
    }

    static restoreNavigator() {
        window.navigator = MockLocales.navigator;
        MockLocales.navigator = null;
        return this;
    }
}

Object.defineProperty(window.navigator, 'languages', { get: () => {
    return MockLocales.languages || [];
}});

Object.defineProperty(window.navigator, 'language', { get: () => {
    return MockLocales.language || null;
}});


describe('browserLanguage', () => {
    test('Selects the first available exact match for language/region', () => {
        MockLocales.setDateTimeLocale(undefined);

        MockLocales.setNavigatorLanguages(['zh-CN', 'zh','en-US','en']);
        expect(browserLanguage()).toEqual('zhCN');

        MockLocales.setNavigatorLanguages(['zh-TW','zh','en-US','en']);
        expect(browserLanguage()).toEqual('zhTW');

        MockLocales.setNavigatorLanguages(['zh', 'en-US', 'en']);
        expect(browserLanguage()).toEqual('en');

        MockLocales.restoreDateTimeLocale();
    });

    test('Selects the first available language match based on language/region',() => {
        MockLocales.setDateTimeLocale(undefined);

        MockLocales.setNavigatorLanguages(['ja-JP', 'ja', 'en-US']);
        expect(browserLanguage()).toEqual('en');

        MockLocales.restoreDateTimeLocale();
    });

    test('Selects the first available language match based on language alone',() => {
        MockLocales.setDateTimeLocale(undefined);

        MockLocales.setNavigatorLanguages(['ja-JP', 'ja', 'zh']);
        expect(browserLanguage()).toEqual('zhCN');

        MockLocales.restoreDateTimeLocale();
    });

    test('Returns false when there is no available match',() => {
        MockLocales.setDateTimeLocale(undefined);

        MockLocales.setNavigatorLanguages(['ja-JP','ja']);
        expect(browserLanguage()).toBeFalsy();

        MockLocales.restoreDateTimeLocale();
    });

    describe('Different sources for user locale', () => {
        test('language, languages and and Intl locale are `undefined`',() => {
            MockLocales.setNavigatorLanguages(undefined);
            MockLocales.setNavigatorLanguage(undefined);
            MockLocales.setDateTimeLocale(undefined);
            expect(browserLanguage()).toBeFalsy();
            MockLocales.restoreDateTimeLocale();
        });

        test('language is `en`, languages and Intl locale are `undefined`',() => {
            MockLocales.setNavigatorLanguage('en');
            MockLocales.setNavigatorLanguages(undefined);
            MockLocales.setDateTimeLocale(undefined);
            expect(browserLanguage()).toEqual('en');
            MockLocales.restoreDateTimeLocale();
        });

        test('language and Intl locale are `undefined`, languages is `en-US, en`',() => {
            MockLocales.setNavigatorLanguage(undefined);
            MockLocales.setNavigatorLanguages(['en-US','en']);
            MockLocales.setDateTimeLocale(undefined);
            expect(browserLanguage()).toEqual('en');
            MockLocales.restoreDateTimeLocale();
        });

        test('navigator is `undefined` and Intl locale is `en-US`',() => {
            MockLocales.setNavigator(undefined);
            MockLocales.setDateTimeLocale('en-US');
            expect(browserLanguage()).toEqual('en');
            MockLocales.restoreDateTimeLocale();
            MockLocales.restoreNavigator();
        });
    });
});