Update Session09 Backend.md

updated to the CreateTicketOrderAsync method

ProjectOrientedSessions/Session09/Session09 Backend.md

@@ -1,30 +1,17 @@
-Here's a **structured checklist document**, broken into **sections by feature area**. Each section contains tasks in implementation order (oldest to newest), rephrased as clear action items with contextual notes for implementation.
+# Session 9 - Ticket Reservation
-These are created based on this commit messages: 
+As this order is comming to an end, we are completing the functionality of application with the vital feature of reserving tickets
-https://github.com/MehrdadShirvani/AlibabaClone-Backend/commits/develop/
 
----
+## Miscellaneous / Fixes
-# Miscellaneous / Fixes
 
 - [ ] Fix GUID generation and async handling in ticket creation. (Use `Guid.NewGuid()` instead of `new Guid()`)
-- [ ]  Make `SerialNumber`, `TicketOrderId`, `BaseAmount` publicly settable in DTOs.
+```csharp
-- [ ] Fix issues in seat mappings and transportation queries.
+SerialNumber = Guid.NewGuid().ToString("N")
-# Fixes and Missing Parts from Session 08 
+```
 
-## 👤 Person & Account Info
+- [ ] Make `SerialNumber`, `TicketOrderId`, `BaseAmount` publicly settable in DTOs if they're private.
+- [ ] Check `Transaction` and make sure `SerialNumber` is not a required property.
 
-- [ ] Add `Person`, `BankAccountDetail`, and navigation properties.
+## Branching
-- [ ]  Add `UpsertPersonAsync` and `UpsertBankAccountDetailAsync` in `IAccountService`.
-- [ ] Add `UpsertPerson`, `UpsertBankDetail` endpoints in `AccountController`.
-- [ ] Add `GetPeople`, `GetProfileAsync`, and DTOs (`ProfileDto`, `PersonDto`, `BankAccountDetailDto`).
-- [ ] Handle person editing logic via `UpsertPerson` and adjust classes that used it the old way.
-## 🔐 Auth & Settings
-
-- [ ]  Complete the error handling of `EditEmailDto`, `EditPasswordDto`.
-- [ ] Add `GetByEmailAsync` in `AccountRepository`.
-
-
-
-# Branching
 - [ ] Create the feature/ticket-reservation branch based on develop
 
 # Ticket Ordering System
@@ -32,16 +19,244 @@ https://github.com/MehrdadShirvani/AlibabaClone-Backend/commits/develop/
 ## 🧱 Domain and Infrastructure Setup
 
 - [ ] Check out new ERD: [Here](https://github.com/TheOrderOfPhoenix/ASP.NET/blob/main/ProjectOrientedSessions/docs/AlibabaERD-Version02.pdf)
-- [ ] Create `TicketOrder`, `Ticket`, and `Transaction` entities.
-- [ ]  Add configurations for `TicketOrder`, `Ticket`, and `Transaction` (relationships, constraints). 
-- [ ] Adjust `Transportation` entity configuration to support ticketing.
 - [ ] Add migrations for the above database changes.
 
 ## 🧑‍💼 Service Layer
 
-- [ ]  Create `ITicketOrderService`, `TicketOrderService` and implement:
+- [ ] Create DTOs `CreateTravellerTicketDto` and `CreateTicketOrderDto`:
-    - [ ] `CreateTicketOrderAsync`
+```csharp
-    - [ ] `GenerateTicketsPdfAsync`
+public class CreateTravellerTicketDto
+{
+    public long Id { get; set; }
+    public long CreatorId { get; set; }
+
+    [Required(ErrorMessage = "First name is required")]
+    public required string FirstName { get; set; }
+
+    [Required(ErrorMessage = "Last name is required")]
+    public required string LastName { get; set; }
+
+    [Required(ErrorMessage = "Id number is required")]
+    [RegularExpression(@"^\d{10}$", ErrorMessage = "National ID number must be exactly 10 digits")]
+    public required string IdNumber { get; set; }
+
+    [Required(ErrorMessage = "Gender should be identified")]
+    public required short GenderId { get; set; }
+
+    [Required(ErrorMessage = "Phone number is required")]
+    [Phone(ErrorMessage = "Invalid phone number format")]
+    public required string PhoneNumber { get; set; }
+
+    [Required(ErrorMessage = "Birth date is required")]
+    public DateTime BirthDate { get; set; }
+
+    public long? SeatId { get; set; }
+    public bool IsVIP { get; set; }
+    public string? Description { get; set; }
+}
+```
+```csharp
+public class CreateTicketOrderDto
+{
+    public long TransportationId { get; set; }
+    public List<CreateTravellerTicketDto> MyProperty { get; set; }
+}
+```
+Note: If you have the **Coupon** feature in your project, then add a `CouponCode` property in `CreateTicketOrderDto`.
+
+- [ ] Modify SeatRepository to add method `GetSeatsByVehicleIdAsync`
+```csharp
+public Task<List<Seat>> GetSeatsByVehicleIdAsync(long vehicleId)
+{
+    var seats = DbSet
+        .Include(s => s.Vehicle)
+        .Include(s => s.Tickets).ThenInclude(t => t.Traveler)
+        .Where(s => s.VehicleId == vehicleId).ToListAsync();
+    return seats;
+}
+```
+- [ ] Add Enum for **TicketStatus**, **VehicleType** and **TransactionType**
+```csharp
+public enum TicketStatusEnum
+{
+    Reserved = 1,
+    Paid = 2,
+    CancelledByUser = 3,
+    CancelledBySystem = 4,
+    Used = 5,
+    Expired = 6
+}
+```
+```csharp
+public enum VehicleTypeEnum
+{
+    Airplane = 1,
+    Train = 2,
+    Bus = 3
+}
+```
+```csharp
+public enum TransactionTypeEnum
+{
+    Deposit = 1,
+    Withdraw = 2
+}
+```
+
+- [ ] Add the lock-service to lock the transportation through reservation, then register it:
+```csharp
+public class TransportationLockService : ITransportationLockService
+{
+    private readonly ConcurrentDictionary<long, SemaphoreSlim> _locks = new();
+
+    public async Task<IDisposable> AcquireLockAsync(long transportationId)
+    {
+        var semaphore = _locks.GetOrAdd(transportationId, new SemaphoreSlim(1, 1));
+        await semaphore.WaitAsync();
+        return new Releaser(() => semaphore.Release());
+    }
+
+    private class Releaser : IDisposable
+    {
+        private readonly Action _release;
+
+        public Releaser(Action release)
+        {
+            _release = release;
+        }
+
+        public void Dispose()
+        {
+            _release();
+        }
+    }
+}
+```
+
+- [ ] Add method `CreateAsync` in `TransportationService`
+```csharp
+public async Task<Result<long>> CreateAsync(long accountId, TransactionDto dto)
+{
+    Transaction transaction = new();
+    _mapper.Map(dto, transaction);
+    transaction.AccountId = accountId;
+
+    await _transactionRepository.InsertAsync(transaction);
+    await _unitOfWork.CompleteAsync();
+    return Result<long>.Success(transaction.Id);
+}
+```
+
+- [ ] Add method `PayForTicketOrderAsync` in `AccountService`
+```csharp
+public async Task<Result<long>> PayForTicketOrderAsync(long accountId, long ticketOrderId, decimal baseAmount, decimal finalAmount)
+{
+    var account = await _accountRepository.GetByIdAsync(accountId);
+    if (account == null)
+    {
+        return Result<long>.Error(0, "Account not found");
+    }
+
+    if (account.Balance < finalAmount)
+    {
+        return Result<long>.Error(0, "Not enough money");
+    }
+
+    account.Withdraw(finalAmount);
+    _accountRepository.Update(account);
+    await _unitOfWork.CompleteAsync();
+
+    TransactionDto dto = new()
+    {
+        CreatedAt = DateTime.UtcNow,
+        Description = "Payment for ticket order #" + ticketOrderId + " at " + DateTime.UtcNow,
+        BaseAmount = baseAmount,
+        FinalAmount = finalAmount,
+        SerialNumber = Guid.NewGuid().ToString("N"),
+        TicketOrderId = ticketOrderId,
+        TransactionTypeId = (int)TransactionTypeEnum.Withdraw,
+        TransactionType = TransactionTypeEnum.Withdraw.ToString()
+    };
+
+    return await _transactionService.CreateAsync(accountId, dto);
+}
+```
+
+- [ ] Create `ITicketOrderService`, `TicketOrderService` and implement `CreateTicketOrderAsync`
+```csharp
+public async Task<Result<long>> CreateTicketOrderAsync(long accountId, CreateTicketOrderDto dto)
+{
+    // get the account
+    var account = await _accountRepository.GetByIdAsync(accountId);
+    if (account == null)
+    {
+        return Result<long>.Error(0, "Account not found");
+    }
+
+    // get the transportation
+    var transportation = await _transportationRepository.GetByIdAsync(dto.TransportationId);
+    if (transportation == null)
+    {
+        return Result<long>.Error(0, "Transportation not found");
+    }
+
+    // lock the transportation through reservation
+    using (await _transportationLockService.AcquireLockAsync(dto.TransportationId))
+    {
+        var baseAmount = transportation.BasePrice * dto.Travellers.Count;
+        if (account.Balance < baseAmount)
+        {
+            return Result<long>.Error(0, "Not enough money");
+        }
+        // check validity of transportation
+        var checkSeats = ValidateTransportationAndSeats(transportation, dto.Travellers);
+        if (!string.IsNullOrEmpty(checkSeats))
+        {
+            return Result<long>.Error(0, checkSeats);
+        }
+
+        var finalAmount = baseAmount;
+        await AssignSeatsIfDynamic(transportation.VehicleId, dto.Travellers);
+        await UpsertTravellers(accountId, dto.Travellers);
+
+        // add the ticket order by the info we have
+        TicketOrder ticketOrder = new()
+        {
+            BuyerId = accountId,
+            CreatedAt = DateTime.UtcNow,
+            Description = "",
+            SerialNumber = Guid.NewGuid().ToString("N"),
+            TransportationId = dto.TransportationId
+        };
+        await _ticketOrderRepository.InsertAsync(ticketOrder);
+        
+        foreach (var traveller in dto.Travellers)
+        {
+            if (!traveller.SeatId.HasValue)
+            {
+                return Result<long>.Error(0, "Seat ID is required for each traveller");
+            }
+
+            Ticket ticket = new()
+            {
+                CreatedAt = DateTime.UtcNow,
+                Description = traveller.Description,
+                SeatId = traveller.SeatId.Value,
+                SerialNumber = Guid.NewGuid().ToString("N"),
+                TicketOrder = ticketOrder,
+                TicketStatusId = 1,
+                TravelerId = traveller.Id,
+            };
+            await _ticketRepository.InsertAsync(ticket);
+        }
+
+        await _unitOfWork.CompleteAsync();
+        await _accountService.PayForTicketOrderAsync(account.Id, ticketOrder.Id,
+            baseAmount, finalAmount);
+        return Result<long>.Success(ticketOrder.Id);
+    }
+}
+```
 - [ ] Register `TicketOrderService` in DI container.
 
 ## 🎯 Controller Layer
@@ -125,7 +340,3 @@ https://github.com/MehrdadShirvani/AlibabaClone-Backend/commits/develop/
 # Merge
 - [ ] Create a PR and merge the current branch with develop
 
-
----
-
-