added invoice model to invoice created event (#3079)

* added model to InvoiceCreatedEvent
* allow to switch formatter locale

src/Invoice/InvoiceFormatter.php

@@ -16,49 +16,21 @@ use DateTime;
  */
 interface InvoiceFormatter
 {
-    /**
-     * @param DateTime $date
-     * @return mixed
-     */
-    public function getFormattedDateTime(DateTime $date);
+    public function getLocale(): string;
 
-    /**
-     * @param DateTime $date
-     * @return mixed
-     */
-    public function getFormattedTime(DateTime $date);
+    public function setLocale(string $locale): void;
 
-    /**
-     * @param int|float $amount
-     * @param string|null $currency
-     * @param bool $withCurrency
-     * @return string
-     */
-    public function getFormattedMoney($amount, ?string $currency, bool $withCurrency = true);
+    public function getFormattedDateTime(DateTime $date): string;
 
-    /**
-     * @param DateTime $date
-     * @return mixed
-     */
-    public function getFormattedMonthName(DateTime $date);
+    public function getFormattedTime(DateTime $date): string;
 
-    /**
-     * @param int $seconds
-     * @return mixed
-     */
-    public function getFormattedDuration($seconds);
+    public function getFormattedMoney(float $amount, ?string $currency, bool $withCurrency = true): string;
 
-    /**
-     * @param int $seconds
-     * @return mixed
-     */
-    public function getFormattedDecimalDuration($seconds);
+    public function getFormattedMonthName(DateTime $date): string;
+
+    public function getFormattedDuration(int $seconds): string;
+
+    public function getFormattedDecimalDuration(int $seconds): string;
 
-    /**
-     * Returns the currency symbol for the given currency by name.
-     *
-     * @param string $currency
-     * @return string
-     */
     public function getCurrencySymbol(string $currency): string;
 }