PIbd-24_Pruidze.I.K_DBproject_Library/LibraryDBproject/LDBproj/Repositories/Implementations/OrderR.cs

using Microsoft.Extensions.Logging;
using LDBproject.Entities;
using Newtonsoft.Json;
using Npgsql;
using Dapper;

namespace LDBproject.Repositories.Implementations;

public class OrderR : IOrderRep
{
    private readonly IConnectionString _connectionString;
    private readonly ILogger<OrderR> _logger;

    public OrderR(IConnectionString connectionString, ILogger<OrderR> logger)
    {
        _connectionString = connectionString;
        _logger = logger;
    }

    public void CreateOrder(Order order)
    {
        _logger.LogInformation("< Adding new ORDER > [!]");
        _logger.LogDebug("Object - {json}", JsonConvert.SerializeObject(order));

        try
        {
            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
            connection.Open();
            using var transaction = connection.BeginTransaction();

            // 1. Insert the Order without RETURNING
            var queryInsert = @"INSERT INTO Orders (CardID, LibrarianID, BorrowDate) VALUES (@CardID, @LibrarianID, @BorrowDate)";

            connection.Execute(queryInsert, new
            {
                order.CardID,
                order.LibrarianID,
                order.BorrowDate
            }, transaction);

            // 2. Get the last inserted OrderID
            var queryGetLastInsertedId = "SELECT MAX(OrderID) FROM Orders";

            int orderID = connection.QuerySingle<int>(queryGetLastInsertedId, transaction: transaction);


            // 3. Insert the Registrations associated with the order
            var querySubInsert = @"INSERT INTO Registrations (OrderID, BookID, Note) VALUES (@OrderID, @BookID, @Note)";
            foreach (var elem in order.Registrations)
            {
                connection.Execute(querySubInsert, new { OrderID = orderID, elem.BookID, elem.Note }, transaction);
            }
            transaction.Commit();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "< Error while adding ORDER >");
            throw;
        }
    }

    public void UpdateOrderInfo(Order order)
    {
        _logger.LogInformation("< Updating order info >");
        _logger.LogDebug("Object - {json}", JsonConvert.SerializeObject(order));

        try
        {
            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
            using var transaction = connection.BeginTransaction();
            // 1. Update order
            var queryUpdate = @"
                UPDATE Orders SET
                    CardID = @CardID,
                    LibrarianID = @LibrarianID,
                    BorrowDate = @BorrowDate
                WHERE OrderID = @OrderID";

            connection.Execute(queryUpdate, new
            {
                order.CardID,
                order.LibrarianID,
                order.BorrowDate,
                order.OrderID
            }, transaction);

            //2. Update registrations:
            var queryDeleteRegistrations = "DELETE FROM Registrations WHERE OrderID = @OrderID";
            connection.Execute(queryDeleteRegistrations, new { OrderID = order.OrderID }, transaction);

            var querySubInsert = @"INSERT INTO Registrations (OrderID, BookID, Note) VALUES (@OrderID, @BookID, @Note)";
            foreach (var elem in order.Registrations)
            {
                connection.Execute(querySubInsert, new { OrderID = order.OrderID, elem.BookID, elem.Note }, transaction);
            }

            transaction.Commit();

        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "< Error while updating order info >");
            throw;
        }
    }

    public void DeleteOrderinfo(int orderID)
    {
        _logger.LogInformation("< Deleting exact order >");
        _logger.LogDebug("Obj: {id}", orderID);
        try
        {
            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
            connection.Open();
            using var transaction = connection.BeginTransaction();

            // 1. Delete registrations for the order
            var queryDeleteRegistrations = @"DELETE FROM Registrations WHERE OrderID=@OrderID";
            connection.Execute(queryDeleteRegistrations, new { OrderID = orderID }, transaction);
            // 2. Delete the order itself
            var queryDel = @"DELETE FROM Orders WHERE OrderID=@OrderID";
            connection.Execute(queryDel, new { orderID }, transaction);

            transaction.Commit();
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "< Error while deleting ORDER >");
            throw;
        }
    }

    // ----------------------------- [ REVIEWED (waits for further editing) ] -------------------------------

    public IEnumerable<Order> GetOrdersInfo(int? orderID = null, int ? librarianID = null, int? customerID = null)
    {
        _logger.LogInformation("< Getting all ORDERS >");
        try
        {
            using var connection = new NpgsqlConnection(_connectionString.ConnectionString);
            connection.Open();
            var querySelectAll = @"SELECT * FROM Orders";
            var orders = connection.Query<Order>(querySelectAll);

            _logger.LogDebug("Aimed objects: {json}", JsonConvert.SerializeObject(orders));

            return orders;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "< Error while reading ORDERS >");
            throw;
        }
    }
}