1 files changed, 156 insertions, 0 deletions
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;
+    }
+}