Currencies can now be enabled and disabled.

app/Repositories/Currency/CurrencyRepository.php

@@ -24,6 +24,7 @@ namespace FireflyIII\Repositories\Currency;
 
 use Carbon\Carbon;
 use FireflyIII\Factory\TransactionCurrencyFactory;
+use FireflyIII\Models\AccountMeta;
 use FireflyIII\Models\CurrencyExchangeRate;
 use FireflyIII\Models\Preference;
 use FireflyIII\Models\TransactionCurrency;
@@ -55,39 +56,62 @@ class CurrencyRepository implements CurrencyRepositoryInterface
     /**
      * @param TransactionCurrency $currency
      *
-     * @return bool
+     * @return int
      */
-    public function canDeleteCurrency(TransactionCurrency $currency): bool
+    public function countJournals(TransactionCurrency $currency): int
     {
-        if ($this->countJournals($currency) > 0) {
-            return false;
-        }
-
-        // is the only currency left
-        if (1 === $this->get()->count()) {
-            return false;
-        }
-
-        // is the default currency for the user or the system
-        $defaultCode = app('preferences')->getForUser($this->user, 'currencyPreference', config('firefly.default_currency', 'EUR'))->data;
-        if ($currency->code === $defaultCode) {
-            return false;
-        }
-
-        // is the default currency for the system
-        $defaultSystemCode = config('firefly.default_currency', 'EUR');
-
-        return !($currency->code === $defaultSystemCode);
+        return $currency->transactions()->count();
     }
 
     /**
      * @param TransactionCurrency $currency
      *
-     * @return int
+     * @return bool
      */
-    public function countJournals(TransactionCurrency $currency): int
+    public function currencyInUse(TransactionCurrency $currency): bool
     {
-        return $currency->transactionJournals()->count();
+        Log::debug(sprintf('Now in currencyInUse() for #%d ("%s")', $currency->id, $currency->code));
+        $countJournals = $this->countJournals($currency);
+        if ($countJournals > 0) {
+            Log::debug(sprintf('Count journals is %d, return true.', $countJournals));
+
+            return true;
+        }
+
+        // is the only currency left
+        if (1 === $this->getAll()->count()) {
+            Log::debug('Is the last currency in the system, return true. ', $countJournals);
+
+            return true;
+        }
+
+        // is being used in accounts:
+        $meta = AccountMeta::where('name', 'currency_id')->where('data', json_encode((string)$currency->id))->count();
+        if ($meta > 0) {
+            Log::debug(sprintf('Used in %d accounts as currency_id, return true. ', $meta));
+
+            return true;
+        }
+
+        // is the default currency for the user or the system
+        $defaultCode = app('preferences')->getForUser($this->user, 'currencyPreference', config('firefly.default_currency', 'EUR'))->data;
+        if ($currency->code === $defaultCode) {
+            Log::debug('Is the default currency of the user, return true.');
+
+            return true;
+        }
+
+        // is the default currency for the system
+        $defaultSystemCode = config('firefly.default_currency', 'EUR');
+        $result            = $currency->code === $defaultSystemCode;
+        if (true === $result) {
+            Log::debug('Is the default currency of the SYSTEM, return true.');
+
+            return true;
+        }
+        Log::debug('Currency is not used, return false.');
+
+        return false;
     }
 
     /**
@@ -110,12 +134,58 @@ class CurrencyRepository implements CurrencyRepositoryInterface
         return true;
     }
 
+    /**
+     * Disables a currency
+     *
+     * @param TransactionCurrency $currency
+     */
+    public function disable(TransactionCurrency $currency): void
+    {
+        $currency->enabled = false;
+        $currency->save();
+    }
+
+    /**
+     * @param TransactionCurrency $currency
+     * Enables a currency
+     */
+    public function enable(TransactionCurrency $currency): void
+    {
+        $currency->enabled = true;
+        $currency->save();
+    }
+
+    /**
+     * Find by ID, return NULL if not found.
+     *
+     * @param int $currencyId
+     *
+     * @return TransactionCurrency|null
+     */
+    public function find(int $currencyId): ?TransactionCurrency
+    {
+        return TransactionCurrency::find($currencyId);
+    }
+
+    /**
+     * Find by currency code, return NULL if unfound.
+     *
+     * @param string $currencyCode
+     *
+     * @return TransactionCurrency|null
+     */
+    public function findByCode(string $currencyCode): ?TransactionCurrency
+    {
+        return TransactionCurrency::where('code', $currencyCode)->first();
+    }
+
     /**
      * Find by currency code, return NULL if unfound.
      * Used in Import Currency!
      *
      * @param string $currencyCode
      *
+     * @deprecated
      * @return TransactionCurrency|null
      */
     public function findByCodeNull(string $currencyCode): ?TransactionCurrency
@@ -123,12 +193,25 @@ class CurrencyRepository implements CurrencyRepositoryInterface
         return TransactionCurrency::where('code', $currencyCode)->first();
     }
 
+    /**
+     * Find by currency name.
+     *
+     * @param string $currencyName
+     *
+     * @return TransactionCurrency
+     */
+    public function findByName(string $currencyName): ?TransactionCurrency
+    {
+        return TransactionCurrency::whereName($currencyName)->first();
+    }
+
     /**
      * Find by currency name or return null.
      * Used in Import Currency!
      *
      * @param string $currencyName
      *
+     * @deprecated
      * @return TransactionCurrency
      */
     public function findByNameNull(string $currencyName): ?TransactionCurrency
@@ -136,12 +219,25 @@ class CurrencyRepository implements CurrencyRepositoryInterface
         return TransactionCurrency::whereName($currencyName)->first();
     }
 
+    /**
+     * Find by currency symbol.
+     *
+     * @param string $currencySymbol
+     *
+     * @return TransactionCurrency
+     */
+    public function findBySymbol(string $currencySymbol): ?TransactionCurrency
+    {
+        return TransactionCurrency::whereSymbol($currencySymbol)->first();
+    }
+
     /**
      * Find by currency symbol or return NULL
      * Used in Import Currency!
      *
      * @param string $currencySymbol
      *
+     * @deprecated
      * @return TransactionCurrency
      */
     public function findBySymbolNull(string $currencySymbol): ?TransactionCurrency
@@ -155,6 +251,7 @@ class CurrencyRepository implements CurrencyRepositoryInterface
      *
      * @param int $currencyId
      *
+     * @deprecated
      * @return TransactionCurrency|null
      */
     public function findNull(int $currencyId): ?TransactionCurrency
@@ -166,6 +263,14 @@ class CurrencyRepository implements CurrencyRepositoryInterface
      * @return Collection
      */
     public function get(): Collection
+    {
+        return TransactionCurrency::where('enabled', true)->orderBy('code', 'ASC')->get();
+    }
+
+    /**
+     * @return Collection
+     */
+    public function getAll(): Collection
     {
         return TransactionCurrency::orderBy('code', 'ASC')->get();
     }

app/Repositories/Currency/CurrencyRepositoryInterface.php

@@ -39,7 +39,7 @@ interface CurrencyRepositoryInterface
      *
      * @return bool
      */
-    public function canDeleteCurrency(TransactionCurrency $currency): bool;
+    public function currencyInUse(TransactionCurrency $currency): bool;
 
     /**
      * @param TransactionCurrency $currency
@@ -55,6 +55,38 @@ interface CurrencyRepositoryInterface
      */
     public function destroy(TransactionCurrency $currency): bool;
 
+    /**
+     * Disables a currency
+     *
+     * @param TransactionCurrency $currency
+     */
+    public function disable(TransactionCurrency $currency): void;
+
+    /**
+     * Enables a currency
+     *
+     * @param TransactionCurrency $currency
+     */
+    public function enable(TransactionCurrency $currency): void;
+
+    /**
+     * Find by ID, return NULL if not found.
+     *
+     * @param int $currencyId
+     *
+     * @return TransactionCurrency|null
+     */
+    public function find(int $currencyId): ?TransactionCurrency;
+
+    /**
+     * Find by currency code, return NULL if unfound.
+     *
+     * @param string $currencyCode
+     *
+     * @return TransactionCurrency|null
+     */
+    public function findByCode(string $currencyCode): ?TransactionCurrency;
+
     /**
      * Find by currency code, return NULL if unfound.
      *
@@ -64,6 +96,15 @@ interface CurrencyRepositoryInterface
      */
     public function findByCodeNull(string $currencyCode): ?TransactionCurrency;
 
+    /**
+     * Find by currency name.
+     *
+     * @param string $currencyName
+     *
+     * @return TransactionCurrency
+     */
+    public function findByName(string $currencyName): ?TransactionCurrency;
+
     /**
      * Find by currency name.
      *
@@ -73,6 +114,15 @@ interface CurrencyRepositoryInterface
      */
     public function findByNameNull(string $currencyName): ?TransactionCurrency;
 
+    /**
+     * Find by currency symbol.
+     *
+     * @param string $currencySymbol
+     *
+     * @return TransactionCurrency
+     */
+    public function findBySymbol(string $currencySymbol): ?TransactionCurrency;
+
     /**
      * Find by currency symbol.
      *
@@ -96,6 +146,11 @@ interface CurrencyRepositoryInterface
      */
     public function get(): Collection;
 
+    /**
+     * @return Collection
+     */
+    public function getAll(): Collection;
+
     /**
      * @param array $ids
      *