4 files changed, 304 insertions, 0 deletions
diff --git a/src/Helpers/Translation/GettextTranslator.php b/src/Helpers/Translation/GettextTranslator.php
new file mode 100644
index 00000000..7f2299e2
--- /dev/null
+++ b/src/Helpers/Translation/GettextTranslator.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Engelsystem\Helpers\Translation;
+
+use Gettext\Translator;
+
+class GettextTranslator extends Translator
+{
+    /**
+     * @param string $domain
+     * @param string $context
+     * @param string $original
+     * @return string
+     * @throws TranslationNotFound
+     */
+    public function dpgettext($domain, $context, $original)
+    {
+        $this->assertHasTranslation($domain, $context, $original);
+
+        return parent::dpgettext($domain, $context, $original);
+    }
+
+    /**
+     * @param string $domain
+     * @param string $context
+     * @param string $original
+     * @param string $plural
+     * @param string $value
+     * @return string
+     * @throws TranslationNotFound
+     */
+    public function dnpgettext($domain, $context, $original, $plural, $value)
+    {
+        $this->assertHasTranslation($domain, $context, $original);
+
+        return parent::dnpgettext($domain, $context, $original, $plural, $value);
+    }
+
+    /**
+     * @param string $domain
+     * @param string $context
+     * @param string $original
+     * @throws TranslationNotFound
+     */
+    protected function assertHasTranslation($domain, $context, $original)
+    {
+        if ($this->getTranslation($domain, $context, $original)) {
+            return;
+        }
+
+        throw new TranslationNotFound(implode('/', [$domain, $context, $original]));
+    }
+}
diff --git a/src/Helpers/Translation/TranslationNotFound.php b/src/Helpers/Translation/TranslationNotFound.php
new file mode 100644
index 00000000..1552838b
--- /dev/null
+++ b/src/Helpers/Translation/TranslationNotFound.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Engelsystem\Helpers\Translation;
+
+use Exception;
+
+class TranslationNotFound extends Exception
+{
+}
diff --git a/src/Helpers/Translation/TranslationServiceProvider.php b/src/Helpers/Translation/TranslationServiceProvider.php
new file mode 100644
index 00000000..09337dad
--- /dev/null
+++ b/src/Helpers/Translation/TranslationServiceProvider.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Engelsystem\Helpers\Translation;
+
+use Engelsystem\Config\Config;
+use Engelsystem\Container\ServiceProvider;
+use Gettext\Translations;
+use Symfony\Component\HttpFoundation\Session\Session;
+
+class TranslationServiceProvider extends ServiceProvider
+{
+    /** @var GettextTranslator */
+    protected $translators = [];
+
+    public function register(): void
+    {
+        /** @var Config $config */
+        $config = $this->app->get('config');
+        /** @var Session $session */
+        $session = $this->app->get('session');
+
+        $locales = $config->get('locales');
+        $locale = $config->get('default_locale');
+        $fallbackLocale = $config->get('fallback_locale', 'en_US');
+
+        $sessionLocale = $session->get('locale', $locale);
+        if (isset($locales[$sessionLocale])) {
+            $locale = $sessionLocale;
+        }
+
+        $session->set('locale', $locale);
+
+        $translator = $this->app->make(
+            Translator::class,
+            [
+                'locale'                => $locale,
+                'locales'               => $locales,
+                'fallbackLocale'        => $fallbackLocale,
+                'getTranslatorCallback' => [$this, 'getTranslator'],
+                'localeChangeCallback'  => [$this, 'setLocale'],
+            ]
+        );
+        $this->app->instance(Translator::class, $translator);
+        $this->app->instance('translator', $translator);
+    }
+
+    /**
+     * @param string $locale
+     * @codeCoverageIgnore
+     */
+    public function setLocale(string $locale): void
+    {
+        $locale .= '.UTF-8';
+        // Set the users locale
+        putenv('LC_ALL=' . $locale);
+        setlocale(LC_ALL, $locale);
+
+        // Reset numeric formatting to allow output of floats
+        putenv('LC_NUMERIC=C');
+        setlocale(LC_NUMERIC, 'C');
+    }
+
+    /**
+     * @param string $locale
+     * @return GettextTranslator
+     */
+    public function getTranslator(string $locale): GettextTranslator
+    {
+        if (!isset($this->translators[$locale])) {
+            $file = $this->app->get('path.lang') . '/' . $locale . '/default.mo';
+
+            /** @var GettextTranslator $translator */
+            $translator = $this->app->make(GettextTranslator::class);
+
+            /** @var Translations $translations */
+            $translations = $this->app->make(Translations::class);
+            $translations->addFromMoFile($file);
+
+            $translator->loadTranslations($translations);
+
+            $this->translators[$locale] = $translator;
+        }
+
+        return $this->translators[$locale];
+    }
+}
diff --git a/src/Helpers/Translation/Translator.php b/src/Helpers/Translation/Translator.php
new file mode 100644
index 00000000..8b11ecb4
--- /dev/null
+++ b/src/Helpers/Translation/Translator.php
@@ -0,0 +1,156 @@
+<?php
+
+namespace Engelsystem\Helpers\Translation;
+
+class Translator
+{
+    /** @var string[] */
+    protected $locales;
+
+    /** @var string */
+    protected $locale;
+
+    /** @var string */
+    protected $fallbackLocale;
+
+    /** @var callable */
+    protected $getTranslatorCallback;
+
+    /** @var callable */
+    protected $localeChangeCallback;
+
+    /**
+     * Translator constructor.
+     *
+     * @param string   $locale
+     * @param string   $fallbackLocale
+     * @param callable $getTranslatorCallback
+     * @param string[] $locales
+     * @param callable $localeChangeCallback
+     */
+    public function __construct(
+        string $locale,
+        string $fallbackLocale,
+        callable $getTranslatorCallback,
+        array $locales = [],
+        callable $localeChangeCallback = null
+    ) {
+        $this->localeChangeCallback = $localeChangeCallback;
+        $this->getTranslatorCallback = $getTranslatorCallback;
+
+        $this->setLocale($locale);
+        $this->fallbackLocale = $fallbackLocale;
+        $this->locales = $locales;
+    }
+
+    /**
+     * Get the translation for a given key
+     *
+     * @param string $key
+     * @param array  $replace
+     * @return string
+     */
+    public function translate(string $key, array $replace = []): string
+    {
+        return $this->translateText('gettext', [$key], $replace);
+    }
+
+    /**
+     * Get the translation for a given key
+     *
+     * @param string $key
+     * @param string $pluralKey
+     * @param int    $number
+     * @param array  $replace
+     * @return string
+     */
+    public function translatePlural(string $key, string $pluralKey, int $number, array $replace = []): string
+    {
+        return $this->translateText('ngettext', [$key, $pluralKey, $number], $replace);
+    }
+
+    /**
+     * @param string $type
+     * @param array  $parameters
+     * @param array  $replace
+     * @return mixed|string
+     */
+    protected function translateText(string $type, array $parameters, array $replace = [])
+    {
+        $translated = $parameters[0];
+
+        foreach ([$this->locale, $this->fallbackLocale] as $lang) {
+            /** @var GettextTranslator $translator */
+            $translator = call_user_func($this->getTranslatorCallback, $lang);
+
+            try {
+                $translated = call_user_func_array([$translator, $type], $parameters);
+                break;
+            } catch (TranslationNotFound $e) {
+            }
+        }
+
+        return $this->replaceText($translated, $replace);
+    }
+
+    /**
+     * Replace placeholders
+     *
+     * @param string $key
+     * @param array  $replace
+     * @return mixed|string
+     */
+    protected function replaceText(string $key, array $replace = [])
+    {
+        if (empty($replace)) {
+            return $key;
+        }
+
+        return call_user_func_array('sprintf', array_merge([$key], $replace));
+    }
+
+    /**
+     * @return string
+     */
+    public function getLocale(): string
+    {
+        return $this->locale;
+    }
+
+    /**
+     * @param string $locale
+     */
+    public function setLocale(string $locale)
+    {
+        $this->locale = $locale;
+
+        if (is_callable($this->localeChangeCallback)) {
+            call_user_func_array($this->localeChangeCallback, [$locale]);
+        }
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getLocales(): array
+    {
+        return $this->locales;
+    }
+
+    /**
+     * @param string $locale
+     * @return bool
+     */
+    public function hasLocale(string $locale): bool
+    {
+        return isset($this->locales[$locale]);
+    }
+
+    /**
+     * @param string[] $locales
+     */
+    public function setLocales(array $locales)
+    {
+        $this->locales = $locales;
+    }
+}