Aberwyn/Aberwyn/Data/MenuService.cs

using MySql.Data.MySqlClient;
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Aberwyn.Models;

namespace Aberwyn.Data
{
    public class MenuService
    {
        private readonly IConfiguration _configuration;
        private readonly IHostEnvironment _env;

        public MenuService(IConfiguration configuration, IHostEnvironment env)
        {
            _configuration = configuration;
            _env = env;
        }

        private MySqlConnection GetConnection()
        {
            var connectionString = _env.IsDevelopment()
                ? _configuration.GetConnectionString("DefaultConnection")
                : _configuration.GetConnectionString("ProductionConnection");

            return new MySqlConnection(connectionString);
        }

        public List<WeeklyMenu> GetWeeklyMenu(int weekNumber, int year)
        {
            var weeklyMenu = new List<WeeklyMenu>();
            using (var connection = GetConnection())
            {
                connection.Open();
                string query = @"
                    SELECT wm.Id, wm.DayOfWeek, wm.DinnerMealId, wm.LunchMealId, wm.WeekNumber, wm.Year,
                           dm.Name AS DinnerMealName, lm.Name AS LunchMealName
                    FROM WeeklyMenu wm
                    LEFT JOIN Meals dm ON wm.DinnerMealId = dm.Id
                    LEFT JOIN Meals lm ON wm.LunchMealId = lm.Id
                    WHERE wm.WeekNumber = @weekNumber AND wm.Year = @year";

                using (var cmd = new MySqlCommand(query, connection))
                {
                    cmd.Parameters.AddWithValue("@weekNumber", weekNumber);
                    cmd.Parameters.AddWithValue("@year", year);

                    using (var reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            weeklyMenu.Add(new WeeklyMenu
                            {
                                Id = reader.GetInt32("Id"),
                                DayOfWeek = reader.GetInt32("DayOfWeek"),
                                DinnerMealId = reader.IsDBNull(reader.GetOrdinal("DinnerMealId")) ? (int?)null : reader.GetInt32("DinnerMealId"),
                                LunchMealId = reader.IsDBNull(reader.GetOrdinal("LunchMealId")) ? (int?)null : reader.GetInt32("LunchMealId"),
                                WeekNumber = reader.GetInt32("WeekNumber"),
                                Year = reader.GetInt32("Year"),
                                DinnerMealName = reader.IsDBNull(reader.GetOrdinal("DinnerMealName")) ? null : reader.GetString("DinnerMealName"),
                                LunchMealName = reader.IsDBNull(reader.GetOrdinal("LunchMealName")) ? null : reader.GetString("LunchMealName"),

                            });
                        }
                    }
                }
            }
            return weeklyMenu;
        }

        public List<Meal> GetMeals()
        {
            var meals = new List<Meal>();
            using (var connection = GetConnection())
            {
                connection.Open();
                string query = "SELECT Id, Name FROM Meals";
                using (var cmd = new MySqlCommand(query, connection))
                {
                    using (var reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            meals.Add(new Meal
                            {
                                Id = reader.GetInt32("Id"),
                                Name = reader.GetString("Name")
                            });
                        }
                    }
                }
            }
            return meals;
        }

        public void UpdateWeeklyMenu(MenuViewModel menuData)
        {
            if (menuData == null || menuData.WeeklyMenus == null)
                throw new ArgumentNullException(nameof(menuData), "Menu data or weekly menus cannot be null.");

            using (var connection = GetConnection())
            {
                connection.Open();
                using (var transaction = connection.BeginTransaction())
                {
                    try
                    {
                        // Loop over each WeeklyMenu in the WeeklyMenus list
                        foreach (var weeklyMenu in menuData.WeeklyMenus)
                        {
                            int dayOfWeek = weeklyMenu.DayOfWeek;
                            var menu = weeklyMenu;

                            // SQL query to update the existing records
                            string query = @"
                        UPDATE WeeklyMenu
                        SET 
                            DinnerMealId = @dinnerMealId,
                            LunchMealId = @lunchMealId,
                            Cook = @cook
                        WHERE DayOfWeek = @dayOfWeek 
                        AND WeekNumber = @weekNumber 
                        AND Year = @year;";

                            using (var cmd = new MySqlCommand(query, connection, transaction))
                            {
                                cmd.Parameters.AddWithValue("@dayOfWeek", dayOfWeek);
                                cmd.Parameters.AddWithValue("@dinnerMealId", menu.DinnerMealId ?? (object)DBNull.Value);
                                cmd.Parameters.AddWithValue("@lunchMealId", menu.LunchMealId ?? (object)DBNull.Value);
                                cmd.Parameters.AddWithValue("@weekNumber", menu.WeekNumber);
                                cmd.Parameters.AddWithValue("@year", menu.Year);
                                cmd.Parameters.AddWithValue("@cook", menu.Cook ?? (object)DBNull.Value);

                                cmd.ExecuteNonQuery();
                            }
                        }

                        transaction.Commit();
                    }
                    catch (Exception ex)
                    {
                        transaction.Rollback();
                        Console.WriteLine($"Error updating weekly menu: {ex.Message}");
                        throw;
                    }
                }
            }
        }

        public int AddMeal(Meal meal)
        {
            using (var connection = GetConnection())
            {
                connection.Open();
                string query = @"
            INSERT INTO Meals (Name, Description, ProteinType, CarbType, RecipeUrl, CreatedAt)
            VALUES (@name, @description, @proteinType, @carbType, @recipeUrl, NOW());
            SELECT LAST_INSERT_ID();";

                using (var cmd = new MySqlCommand(query, connection))
                {
                    cmd.Parameters.AddWithValue("@name", meal.Name);
                    cmd.Parameters.AddWithValue("@description", string.IsNullOrWhiteSpace(meal.Description) ? (object)DBNull.Value : meal.Description);
                    cmd.Parameters.AddWithValue("@proteinType", string.IsNullOrWhiteSpace(meal.ProteinType) ? (object)DBNull.Value : meal.ProteinType);
                    cmd.Parameters.AddWithValue("@carbType", string.IsNullOrWhiteSpace(meal.CarbType) ? (object)DBNull.Value : meal.CarbType);
                    cmd.Parameters.AddWithValue("@recipeUrl", string.IsNullOrWhiteSpace(meal.RecipeUrl) ? (object)DBNull.Value : meal.RecipeUrl);

                    var result = cmd.ExecuteScalar();
                    return result != null ? Convert.ToInt32(result) : 0;
                }
            }
        }



        private int GetDayOfWeek(string day)
        {
            return day switch
            {
                "Monday" => 1,
                "Tuesday" => 2,
                "Wednesday" => 3,
                "Thursday" => 4,
                "Friday" => 5,
                "Saturday" => 6,
                "Sunday" => 7,
                _ => throw new System.ArgumentException("Invalid day name")
            };
        }
    }
}

// Models for Meals and WeeklyMenu