Add project files.

BudgetApp/Services/AccountService.cs

@@ -0,0 +1,75 @@
+using Microsoft.EntityFrameworkCore;
+using BudgetApp.Data;
+
+namespace BudgetApp.Services;
+
+public class AccountService
+{
+    private readonly ApplicationDbContext _db;
+
+    public AccountService(ApplicationDbContext db)
+    {
+        _db = db;
+    }
+
+    public async Task<List<Account>> GetAccountsAsync(string userId)
+    {
+        return await _db.Accounts
+            .Where(a => a.UserId == userId)
+            .OrderBy(a => a.Name)
+            .ToListAsync();
+    }
+
+    public async Task<Account?> GetAccountAsync(int id, string userId)
+    {
+        return await _db.Accounts
+            .FirstOrDefaultAsync(a => a.Id == id && a.UserId == userId);
+    }
+
+    public async Task CreateAccountAsync(Account account)
+    {
+        _db.Accounts.Add(account);
+        await _db.SaveChangesAsync();
+    }
+
+    public async Task UpdateAccountAsync(Account account)
+    {
+        _db.Accounts.Update(account);
+        await _db.SaveChangesAsync();
+    }
+
+    public async Task UpdateBalanceAsync(int id, string userId, decimal newBalance)
+    {
+        var account = await _db.Accounts
+            .FirstOrDefaultAsync(a => a.Id == id && a.UserId == userId);
+        if (account is not null)
+        {
+            account.CurrentBalance = newBalance;
+            await _db.SaveChangesAsync();
+        }
+    }
+
+    public async Task UpdateAccountDetailsAsync(int id, string userId, string name, string color, string currencyCode)
+    {
+        var account = await _db.Accounts
+            .FirstOrDefaultAsync(a => a.Id == id && a.UserId == userId);
+        if (account is not null)
+        {
+            account.Name = name;
+            account.Color = color;
+            account.CurrencyCode = currencyCode;
+            await _db.SaveChangesAsync();
+        }
+    }
+
+    public async Task DeleteAccountAsync(int id, string userId)
+    {
+        var account = await _db.Accounts
+            .FirstOrDefaultAsync(a => a.Id == id && a.UserId == userId);
+        if (account is not null)
+        {
+            _db.Accounts.Remove(account);
+            await _db.SaveChangesAsync();
+        }
+    }
+}