final1

SecureBank.API/SecureBank.API.Services/BalanceService.cs

@@ -0,0 +1,81 @@
+using Microsoft.AspNetCore.Mvc.ApiExplorer;
+using Microsoft.EntityFrameworkCore;
+using SecureBank.Authentication;
+using SecureBank.Common;
+using SecureBank.Database;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SecureBank.API.Services
+{
+    public interface IBalanceService
+    {
+        Task<APIResponse<decimal>> GetAccountBalance(int accountId);
+        Task<APIResponse<decimal>> GetBalance(Claims claims);
+    }
+
+
+
+    public class BalanceService : IBalanceService
+    {
+        #region SERVICES
+
+        private DatabaseContext _database;
+
+        #endregion
+
+
+
+        #region CONSTRUCTORS
+
+        public BalanceService(DatabaseContext database)
+        {
+            _database = database;
+        }
+
+        #endregion
+
+
+
+        #region PUBLIC METHODS
+
+        public async Task<APIResponse<decimal>> GetBalance(Claims claims) => await GetAccountBalance(claims.AccountId);
+
+        public async Task<APIResponse<decimal>> GetAccountBalance(int accountId)
+        {
+            Account? account = await _database.Accounts.FirstOrDefaultAsync(x => x.Id == accountId);
+
+            if (account is null)
+            {
+                return new APIResponse<decimal> 
+                {
+                    Status = ResponseStatus.BadRequest,
+                    Message = "Account does not exists"
+                };
+            }
+
+            string iban = account.IBAN;
+
+            Transfer[] transfersIncoming = await _database.Transfers.Where(x => x.ReceiverAccountNumber == iban).ToArrayAsync();
+            Transfer[] transfersOutcoming = await _database.Transfers.Where(x => x.SenderAccountNumber == iban).ToArrayAsync();
+
+            return new APIResponse<decimal>
+            {
+                Data = 0 + transfersIncoming.Sum(x => x.Amount) - transfersOutcoming.Sum(x => x.Amount),
+            };
+        }
+
+        #endregion
+
+
+
+        #region PRIVATE METHODS
+
+
+
+        #endregion
+    }
+}