public IActionResult Reserve([FromQuery, Required] int bookId)
{
// Check if the User is logged in
if (HttpContext.Session.GetInt32("UserId") == null)
{
// Pass the error-message through the TempData, because the model cannot be passed
TempData["ErrorMessage"] = $"It seems you are not logged in";
return(RedirectToAction("Index", "Home"));
}
// Get the User by the Id from the Session and the Book by the bookId
var user = _userBusinessLogic.GetUserById((int)HttpContext.Session.GetInt32("UserId"));
var book = _bookBusinessLogic.GetBook(bookId);
// Check if the Book exists
if (book != null)
{
// Check if the User exists
if (_userBusinessLogic.UserExists(user?.Name))
{
// Try to reserve the Book
var reserveSuccessful = _bookBusinessLogic.ReserveBook(bookId, user.Id);
// Check if the Book has been reserved successfully
if (reserveSuccessful)
{
// Pass the success-message through the TempData, because the model cannot be passed
TempData["Successmessage"] = $"The book has been reserved";
// Prepare the model
var model = prepareDetailedViewModel(book);
return(View("Index", model));
}
// Pass the error-message through the TempData, because the model cannot be passed
TempData["ErrorMessage"] = $"The book \"{book.Title}\" could not be reserved";
return(RedirectToAction("Index", "Home"));
}
else
{
// Pass the error-message through the TempData, because the model cannot be passed
TempData["ErrorMessage"] = $"There has been an unexpected Error with your session";
return(RedirectToAction("Index", "Home"));
}
}
else
{
// Pass the error-message through the TempData, because the model cannot be passed
TempData["ErrorMessage"] = $"The book with id {bookId} does not exist";
return(RedirectToAction("Index", "Home"));
}
}