invtory-desktop/InventoryTest/CategoryManager.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace InventoryTest
{
    public partial class CategoryManager : Form
    {
        private static string ConnectionString { get; set; }
        private static Dictionary<string, int> CategoryIds { get; } = new();
        private static Dictionary<string, int> SubCategoryIds { get; } = new();

        public CategoryManager(string connectionString)
        {
            ConnectionString = connectionString;

            InitializeComponent();

            CategoryComboBoxManager.SelectedIndexChanged += CategoryComboBoxManager_SelectedIndexChanged;
            SubCategoryComboBoxManager.SelectedIndexChanged += SubCategoryComboBoxManager_SelectedIndexChanged;
            CategoryPropertyNameTextBox.TextChanged += CategoryPropertyNameTextBox_TextChanged;
            SubCategoryPropertyNameTextBox.TextChanged += SubCategoryNameTextBox_TextChanged;
            NewCategoryNameTextBox.TextChanged += NewCategoryNameTextBox_TextChanged;

            LoadCategories();
        }

        private void NewCategoryNameTextBox_TextChanged(object sender, EventArgs e)
        {
            CreateNewCategoryButton.Enabled = !string.IsNullOrEmpty(NewCategoryNameTextBox.Text);
            CreateNewSubCategoryButton.Enabled = !string.IsNullOrEmpty(NewCategoryNameTextBox.Text);
        }

        private void SubCategoryNameTextBox_TextChanged(object sender, EventArgs e)
        {
            CreateSubCategoryButton.Enabled = !string.IsNullOrEmpty(SubCategoryPropertyNameTextBox.Text);
        }

        private void CategoryPropertyNameTextBox_TextChanged(object sender, EventArgs e)
        {
            CreateCategoryPropertyButton.Enabled = !string.IsNullOrEmpty(CategoryPropertyNameTextBox.Text);
        }

        private void SubCategoryComboBoxManager_SelectedIndexChanged(object sender, EventArgs e)
        {
            LoadSubCategoryProperties();
        }

        private void CategoryComboBoxManager_SelectedIndexChanged(object sender, EventArgs e)
        {
            SubCategoryComboBoxManager.Items.Clear();
            CategoryPropertiesListBox.Items.Clear();
            SubCategoryPropertiesListBox.Items.Clear();
            var id = CategoryIds[CategoryComboBoxManager.Text];
            SubCategoryIds.Clear();

            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("SELECT * FROM dbo.GetCategorySubCategories(@ID)", connection);
            command.Parameters.AddWithValue("ID", id);

            connection.Open();

            var reader = command.ExecuteReader();

            while (reader.Read()) 
            {
                SubCategoryComboBoxManager.Items.Add(reader["Name"]);
                SubCategoryIds.Add(reader["Name"].ToString(), Convert.ToInt32(reader["ID"]));
            }

            reader.Close();

            if (SubCategoryComboBoxManager.Items.Count > 0)
            {
                SubCategoryComboBoxManager.Enabled = true;
                SubCategoryComboBoxManager.SelectedIndex = 0;
                ToggleSubCategoryProperty(true);
            }
            else
            {
                ToggleSubCategoryProperty(false);
                SubCategoryComboBoxManager.Enabled = false;
            }

            LoadCategoryProperties();
        }

        private void LoadCategories()
        {
            CategoryComboBoxManager.Items.Clear();
            SubCategoryComboBoxManager.Items.Clear();
            CategoryIds.Clear();

            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("SELECT [Category ID], [Category Name] FROM Category", connection);

            connection.Open();

            var reader = command.ExecuteReader();

            while (reader.Read())
            {
                CategoryIds.Add(reader["Category Name"].ToString(), Convert.ToInt32(reader["Category ID"]));
                CategoryComboBoxManager.Items.Add(reader["Category Name"]);
            }

            reader.Close();

            if (CategoryComboBoxManager.Items.Count > 0)
            {
                ToggleCategoryProperty(true);
                CategoryComboBoxManager.SelectedIndex = 0;
            }
            else ToggleCategoryProperty(false);
        }

        private void LoadCategoryProperties()
        {
            CategoryPropertiesListBox.Items.Clear();

            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("SELECT * FROM GetCategoryProperties(@CategoryID)", connection);
            command.Parameters.AddWithValue("CategoryID", CategoryIds[CategoryComboBoxManager.Text]);

            connection.Open();

            var reader = command.ExecuteReader();

            while (reader.Read())
                CategoryPropertiesListBox.Items.Add(reader["Name"]);
        }

        private void LoadSubCategoryProperties()
        {
            SubCategoryPropertiesListBox.Items.Clear();
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("SELECT * FROM GetSubCategoryProperties(@ID)", connection);
            command.Parameters.AddWithValue("ID", SubCategoryIds[SubCategoryComboBoxManager.Text]);

            connection.Open();

            var reader = command.ExecuteReader();

            while (reader.Read())
                SubCategoryPropertiesListBox.Items.Add(reader["Name"]);
        }

        private void ToggleSubCategoryProperty(bool enabled)
        {
            SubCategoryPropertyNameTextBox.Enabled = enabled;
            CreateSubCategoryButton.Enabled = enabled;
            DeleteSubCategoryButton.Enabled = enabled;
        }

        private void ToggleCategoryProperty(bool enabled)
        {
            CategoryPropertyNameTextBox.Enabled = enabled;
            CreateCategoryPropertyButton.Enabled = enabled;
            DeleteCategoryButton.Enabled = enabled;
        }

        private void CreateCategoryPropertyButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("CreateCategoryPropertyByName", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("PropertyName", CategoryPropertyNameTextBox.Text);
            command.Parameters.AddWithValue("CategoryID", CategoryIds[CategoryComboBoxManager.Text]);

            connection.Open();

            command.ExecuteNonQuery();

            LoadCategoryProperties();

            CategoryPropertyNameTextBox.Text = string.Empty;
            CategoryPropertyNameTextBox.Focus();
        }
        
        private void CreateSubCategoryButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("CreateSubCategoryPropertyByName", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("PropertyName", SubCategoryPropertyNameTextBox.Text);
            command.Parameters.AddWithValue("SubCategoryID", SubCategoryIds[SubCategoryComboBoxManager.Text]);

            connection.Open();

            command.ExecuteNonQuery();

            LoadSubCategoryProperties();

            SubCategoryPropertyNameTextBox.Text = string.Empty;
            SubCategoryPropertyNameTextBox.Focus();
        }

        private void CreateNewCategoryButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("CreateCategory", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("Category", NewCategoryNameTextBox.Text);

            connection.Open();

            CategoryIds.Add(NewCategoryNameTextBox.Text, Convert.ToInt32(command.ExecuteScalar()));

            CategoryComboBoxManager.Items.Add(NewCategoryNameTextBox);

            NewCategoryNameTextBox.Text = string.Empty;
            NewCategoryNameTextBox.Focus();

            if (CategoryComboBoxManager.SelectedIndex == -1) CategoryComboBoxManager.SelectedIndex = 0;
        }

        private void CreateNewSubCategoryButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("CreateSubCategory", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("SubCategory", NewCategoryNameTextBox.Text);
            command.Parameters.AddWithValue("CategoryID", CategoryIds[CategoryComboBoxManager.Text]);

            connection.Open();

            SubCategoryIds.Add(NewCategoryNameTextBox.Text, Convert.ToInt32(command.ExecuteScalar()));

            SubCategoryComboBoxManager.Items.Add(NewCategoryNameTextBox.Text);

            NewCategoryNameTextBox.Text = string.Empty;
            NewCategoryNameTextBox.Focus();

            SubCategoryComboBoxManager.Enabled = true;

            if (SubCategoryComboBoxManager.SelectedIndex == -1) SubCategoryComboBoxManager.SelectedIndex = 0;
        }

        private void DeleteCategoryButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("DeleteCategory", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("CategoryID", CategoryIds[CategoryComboBoxManager.Text]);

            connection.Open();

            command.ExecuteNonQuery();

            LoadCategories();
        }

        private void DeleteSubCategoryButton_Click(object sender, EventArgs e)
        {
            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("DeleteSubCategory", connection) { CommandType = CommandType.StoredProcedure };
            command.Parameters.AddWithValue("SubCategoryID", SubCategoryIds[SubCategoryComboBoxManager.Text]);

            connection.Open();

            command.ExecuteNonQuery();

            SubCategoryIds.Remove(SubCategoryComboBoxManager.Text);
            SubCategoryComboBoxManager.Items.RemoveAt(SubCategoryComboBoxManager.SelectedIndex);
        }
    }
}