add currency services file

Frontend/lib/mih_services/mih_currency_exchange_rate_services.dart

@@ -0,0 +1,73 @@
+import 'dart:convert';
+
+import 'package:mzansi_innovation_hub/mih_components/mih_objects/currency.dart';
+import 'package:supertokens_flutter/http.dart' as http;
+
+class MihCurrencyExchangeRateServices {
+  static Future<List<Currency>> getCurrencyObjectList() async {
+    final response = await http.get(Uri.parse(
+        "https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies.min.json"));
+    if (response.statusCode == 200) {
+      final Map<String, dynamic> jsonMap = json.decode(response.body);
+      List<Currency> currencies = [];
+      jsonMap.forEach((code, dynamic nameValue) {
+        final String name = nameValue is String ? nameValue : 'Unknown Name';
+        currencies.add(Currency(code: code, name: name));
+      });
+      currencies.sort((a, b) => a.name.compareTo(b.name));
+      return currencies;
+    } else {
+      throw Exception('failed to fatch currencies');
+    }
+  }
+
+  static Future<List<String>> getCurrencyCodeList() async {
+    final response = await http.get(Uri.parse(
+        "https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies.min.json"));
+    if (response.statusCode == 200) {
+      final Map<String, dynamic> jsonMap = json.decode(response.body);
+      List<String> currencies = [];
+      jsonMap.forEach((code, dynamic nameValue) {
+        final String name = nameValue is String ? nameValue : 'Unknown Name';
+        currencies.add("$code - $name");
+      });
+      currencies.sort();
+      return currencies;
+    } else {
+      throw Exception('failed to fatch currencies');
+    }
+  }
+
+  static Future<double> getCurrencyExchangeValue(
+    String fromCurrencyCode,
+    String toCurrencyCode,
+  ) async {
+    final response = await http.get(Uri.parse(
+        "https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies/$fromCurrencyCode.min.json"));
+    if (response.statusCode == 200) {
+      final Map<String, dynamic> jsonResponse = json.decode(response.body);
+      final Map<String, dynamic>? baseCurrencyData =
+          jsonResponse[fromCurrencyCode];
+
+      if (baseCurrencyData != null) {
+        // Access the value for the target currency (e.g., "usd")
+        final dynamic rateValue = baseCurrencyData[toCurrencyCode];
+
+        if (rateValue is num) {
+          // Check if it's a number (int or double)
+          return rateValue.toDouble();
+        } else {
+          // Handle cases where the rate might not be a number or is missing
+          print(
+              'Warning: Rate for $toCurrencyCode in $fromCurrencyCode is not a number or missing.');
+          return 0;
+        }
+      } else {
+        throw Exception(
+            'Base currency "$fromCurrencyCode" data not found in response.');
+      }
+    } else {
+      throw Exception('failed to fatch currencies');
+    }
+  }
+}