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 Form1 : Form
    {
        private string ConnectionString { get; } = "Server=DESKTOP-HJES64T;Database=Inventory;Integrated Security=true;";
        private int CommentsMaxLength { get; } = 3072;
        private int NotesMaxLength { get; } = 3072;
        private Dictionary<string, int> CategoryIds { get; } = new();
        private Dictionary<string, int> SubCategoryIds { get; } = new();
        private Dictionary<string, int> PropertyTypeIds { get; } = new();

        public Form1()
        {
            InitializeComponent();

            ManageCategoriesToolStripMenuItem.Click += ShowCategoryManagerForm;
            exitToolStripMenuItem.Click += ExitToolStripMenuItem_Click;
            CorePropertyCommentTextBox.TextChanged += CorePropertyCommentTextBox_TextChanged;
            CorePropertyCommentTextBox.MaxLength = CommentsMaxLength;
            CorePropertyCommentGroupBox.Text = $"Comments (Remaing Characters: {CorePropertyCommentTextBox.MaxLength - CorePropertyCommentTextBox.TextLength})";
            CorePropertyNotesTextBox.TextChanged += CorePropertyNotesTextBox_TextChanged;
            CorePropertyNotesTextBox.MaxLength = NotesMaxLength;
            CorePropertyNotesGroupBox.Text = $"Notes (Remaing Characters: {CorePropertyNotesTextBox.MaxLength - CorePropertyNotesTextBox.TextLength})";
            CorePropertyNameTextBox.TextChanged += ToggleCreateItemButton;
            CorePropertyBoughtForTextBox.TextChanged += ToggleCreateItemButton;
            CorePropertySoldForTextBox.TextChanged += ToggleCreateItemButton;
            CorePropertyValueTextBox.TextChanged += ToggleCreateItemButton;

            CategorySelectionComboBox.SelectedIndexChanged += CategorySelectionComboBox_SelectedIndexChanged;
            SubCategorySelectionComboBox.SelectedIndexChanged += SubCategorySelectionComboBox_SelectedIndexChanged;

            LoadCategories();
        }

        private void SubCategorySelectionComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            //throw new NotImplementedException();
        }

        private void CategorySelectionComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            SubCategoryIds.Clear();
            SubCategorySelectionComboBox.Items.Clear();

            using var connection = new SqlConnection(ConnectionString);
            using var command = new SqlCommand("SELECT ID, Name FROM dbo.GetCategorySubCategories(@ID)", connection);
            command.Parameters.AddWithValue("ID", CategoryIds[CategorySelectionComboBox.Text]);

            connection.Open();

            var reader = command.ExecuteReader();

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

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

        private void LoadCategories()
        {
            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"]));
                CategorySelectionComboBox.Items.Add(reader["Category Name"]);
            }

            reader.Close();

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

        private void ToggleCreateItemButton(object sender, EventArgs e)
        {
            var valueValid = CorePropertyValueTextBox.Text.Trim().Length == 0;
            var boughtForValid = CorePropertyBoughtForTextBox.Text.Trim().Length == 0;
            var soldForValid = CorePropertySoldForTextBox.Text.Trim().Length == 0;

            if (!valueValid) valueValid = decimal.TryParse(CorePropertyValueTextBox.Text, out decimal _);
            if (!boughtForValid) boughtForValid = decimal.TryParse(CorePropertyBoughtForTextBox.Text, out decimal _);
            if (!soldForValid) soldForValid = decimal.TryParse(CorePropertySoldForTextBox.Text, out decimal _);

            CreateItemButton.Enabled = CorePropertyNameTextBox.Text.Trim().Length > 0 && valueValid && boughtForValid && soldForValid;
        }

        private void CorePropertyNotesTextBox_TextChanged(object sender, EventArgs e)
        {
            CorePropertyNotesGroupBox.Text = $"Notes (Remaing Characters: {CorePropertyNotesTextBox.MaxLength - CorePropertyNotesTextBox.TextLength})";
        }

        private void CorePropertyCommentTextBox_TextChanged(object sender, EventArgs e)
        {
            CorePropertyCommentGroupBox.Text = $"Comments (Remaing Characters: {CorePropertyCommentTextBox.MaxLength - CorePropertyCommentTextBox.TextLength})";
        }

        private void ExitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void ShowCategoryManagerForm(object sender, EventArgs e)
        {
            var form = new CategoryManager(ConnectionString);
            form.ShowDialog();
        }

        private struct ItemPropertyPairing
        {
            public int PropertyID;
            public int ItemID;
            public int PropertyTypeID;
            public string Value;
        }
    }
}