--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Simoleon/Jobs/CurrenciesController.swift	Wed Aug 25 10:43:12 2021 +0100
@@ -0,0 +1,54 @@
+//
+//  GetCompatibleCurrencies.swift
+//  Simoleon
+//
+//  Created by Dennis Concepción Martín on 24/8/21.
+//
+
+import Foundation
+
+class CurrenciesController {
+    let fileController = FileController()
+    
+    func get(currenciesCompatibleWith currencySymbol: String?, currencies: Bool?) -> [String] {
+        // If currencies not false -> return all currencies
+        guard currencies == false else { return allCurrencies() }
+        
+        // This block won't be executed if the previous check fails
+        return compatibleCurrencies(with: currencySymbol!)
+    }
+    
+    /*
+     * Input all currencies supported by vendor
+     * Return individual currency symbols without duplicates
+     */
+    private func allCurrencies() -> [String] {
+        let currencyPairsSupported: [String] = try! fileController.read(json: "CurrencyPairsSupported.json")
+        
+        var currencies = Set<String>()
+        for currencyPairSupported in currencyPairsSupported {
+            let currency = currencyPairSupported.components(separatedBy: "/")[0]
+            currencies.insert(currency)
+        }
+        
+        return Array(currencies)
+    }
+    
+    /*
+     * Given the first symbol of the currency pair
+     * Return all compatible symbols
+     */
+    private func compatibleCurrencies(with currencySymbol: String) -> [String] {
+        let currencyPairsSupported: [String] = try! fileController.read(json: "CurrencyPairsSupported.json")
+        
+        var currencies = [String]()
+        for currencyPairSupported in currencyPairsSupported {
+            if currencyPairSupported.hasPrefix(currencySymbol) {
+                let compatibleCurrency = currencyPairSupported.components(separatedBy: "/")[1]
+                currencies.append(compatibleCurrency)
+            }
+        }
+        
+        return currencies
+    }
+}