class UserAgentTest

class UserAgentTest extends TestCase {
    
    /**
     * Helper method to supply language codes to testGetBestMatchingLangcode().
     *
     * @return array
     *   Language codes, ordered by priority.
     */
    protected function getLanguages() : array {
        return [
            // In our test case, 'en' has priority over 'en-US'.
'en',
            'en-US',
            // But 'fr-CA' has priority over 'fr'.
'fr-CA',
            'fr',
            // 'es-MX' is alone.
'es-MX',
            // 'pt' is alone.
'pt',
            // Language codes with more then one dash are actually valid.
            // eh-oh-laa-laa is the official language code of the Teletubbies.
'eh-oh-laa-laa',
            // Chinese languages.
'zh-hans',
            'zh-hant',
            'zh-hant-tw',
        ];
    }
    
    /**
     * Helper method to supply language mappings to testGetBestMatchingLangcode().
     *
     * @return array
     *   Language mappings.
     */
    protected function getMappings() : array {
        return [
            'no' => 'nb',
            'pt' => 'pt-pt',
            'zh' => 'zh-hans',
            'zh-tw' => 'zh-hant',
            'zh-hk' => 'zh-hant',
            'zh-mo' => 'zh-hant',
            'zh-cht' => 'zh-hant',
            'zh-cn' => 'zh-hans',
            'zh-sg' => 'zh-hans',
            'zh-chs' => 'zh-hans',
        ];
    }
    
    /**
     * Tests matching language from user agent.
     *
     * @dataProvider providerTestGetBestMatchingLangcode
     * @covers ::getBestMatchingLangcode
     */
    public function testGetBestMatchingLangcode($accept_language, $expected) : void {
        $result = UserAgent::getBestMatchingLangcode($accept_language, $this->getLanguages(), $this->getMappings());
        $this->assertSame($expected, $result);
    }
    
    /**
     * Data provider for testGetBestMatchingLangcode().
     *
     * @return array
     *   - An accept-language string.
     *   - Expected best matching language code.
     */
    public static function providerTestGetBestMatchingLangcode() {
        // Random generator.
        $random = new Random();
        return [
            // Equal qvalue for each language, choose the site preferred one.
[
                'en,en-US,fr-CA,fr,es-MX',
                'en',
            ],
            [
                'en-US,en,fr-CA,fr,es-MX',
                'en',
            ],
            [
                'fr,en',
                'en',
            ],
            [
                'en,fr',
                'en',
            ],
            [
                'en-US,fr',
                'en-US',
            ],
            [
                'fr,en-US',
                'en-US',
            ],
            [
                'fr,fr-CA',
                'fr-CA',
            ],
            [
                'fr-CA,fr',
                'fr-CA',
            ],
            [
                'fr',
                'fr-CA',
            ],
            [
                'fr;q=1',
                'fr-CA',
            ],
            [
                'fr,es-MX',
                'fr-CA',
            ],
            [
                'fr,es',
                'fr-CA',
            ],
            [
                'es,fr',
                'fr-CA',
            ],
            [
                'es-MX,de',
                'es-MX',
            ],
            [
                'de,es-MX',
                'es-MX',
            ],
            // Different cases and whitespace.
[
                'en',
                'en',
            ],
            [
                'En',
                'en',
            ],
            [
                'EN',
                'en',
            ],
            [
                ' en',
                'en',
            ],
            [
                'en ',
                'en',
            ],
            [
                'en, fr',
                'en',
            ],
            // A less specific language from the browser matches a more specific one
            // from the website, and the other way around for compatibility with
            // some versions of Internet Explorer.
[
                'es',
                'es-MX',
            ],
            [
                'es-MX',
                'es-MX',
            ],
            [
                'pt',
                'pt',
            ],
            [
                'pt-PT',
                'pt',
            ],
            [
                'pt-PT;q=0.5,pt-BR;q=1,en;q=0.7',
                'en',
            ],
            [
                'pt-PT;q=1,pt-BR;q=0.5,en;q=0.7',
                'en',
            ],
            [
                'pt-PT;q=0.4,pt-BR;q=0.1,en;q=0.7',
                'en',
            ],
            [
                'pt-PT;q=0.1,pt-BR;q=0.4,en;q=0.7',
                'en',
            ],
            // Language code with several dashes are valid. The less specific language
            // from the browser matches the more specific one from the website.
[
                'eh-oh-laa-laa',
                'eh-oh-laa-laa',
            ],
            [
                'eh-oh-laa',
                'eh-oh-laa-laa',
            ],
            [
                'eh-oh',
                'eh-oh-laa-laa',
            ],
            [
                'eh',
                'eh-oh-laa-laa',
            ],
            // Different qvalues.
[
                'fr,en;q=0.5',
                'fr-CA',
            ],
            [
                'fr,en;q=0.5,fr-CA;q=0.25',
                'fr',
            ],
            // Silly wildcards are also valid.
[
                '*,fr-CA;q=0.5',
                'en',
            ],
            [
                '*,en;q=0.25',
                'fr-CA',
            ],
            [
                'en,en-US;q=0.5,fr;q=0.25',
                'en',
            ],
            [
                'en-US,en;q=0.5,fr;q=0.25',
                'en-US',
            ],
            // Unresolvable cases.
[
                '',
                FALSE,
            ],
            [
                'de,pl',
                FALSE,
            ],
            [
                'iecRswK4eh',
                FALSE,
            ],
            [
                $random->name(10, TRUE),
                FALSE,
            ],
            // Chinese langcodes.
[
                'zh-cn, en-us;q=0.90, en;q=0.80, zh;q=0.70',
                'zh-hans',
            ],
            [
                'zh-tw, en-us;q=0.90, en;q=0.80, zh;q=0.70',
                'zh-hant',
            ],
            [
                'zh-hant, en-us;q=0.90, en;q=0.80, zh;q=0.70',
                'zh-hant',
            ],
            [
                'zh-hans, en-us;q=0.90, en;q=0.80, zh;q=0.70',
                'zh-hans',
            ],
            // @todo This is copied from RFC4647 but our regex skips the numbers so
            //   they where removed. Our code should be updated so private1-private2
            //   is valid. http://tools.ietf.org/html/rfc4647#section-3.4
[
                'zh-hant-CN-x-private-private, en-us;q=0.90, en;q=0.80, zh;q=0.70',
                'zh-hant',
            ],
            [
                'zh-cn',
                'zh-hans',
            ],
            [
                'zh-sg',
                'zh-hans',
            ],
            [
                'zh-tw',
                'zh-hant',
            ],
            [
                'zh-hk',
                'zh-hant',
            ],
            [
                'zh-mo',
                'zh-hant',
            ],
            [
                'zh-hans',
                'zh-hans',
            ],
            [
                'zh-hant',
                'zh-hant',
            ],
            [
                'zh-chs',
                'zh-hans',
            ],
            [
                'zh-cht',
                'zh-hant',
            ],
        ];
    }

}