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

namespace WinFormsControlLibrary1;


public partial class ComboSingleAddControl : UserControl
{
    private readonly ComboBox _combo = new() { Dock = DockStyle.Fill };
    public EventHandler? SelectedValueChanged;
    public ComboSingleAddControl()
    {
        InitializeComponent();
        Controls.Add(_combo);
        _combo.SelectedIndexChanged += (_, __) => SelectedValueChanged?.Invoke(this, EventArgs.Empty);
    }
    

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
    public string SelectedValue
    {
        get => _combo.SelectedItem.ToString() ?? string.Empty; 
        set
        {
            if(string.IsNullOrEmpty(value)) { _combo.SelectedIndex = -1; return; }
            int id = _combo.Items.IndexOf(value);
            if(id >= 0) _combo.SelectedIndex = id;
        }
    }

    public void AddValue(string value)
    {
        if (string.IsNullOrEmpty(value)) return;
        if (_combo.Items.Contains(value)) return;
        _combo.Items.Add(value);
        if(_combo.SelectedIndex < 0) _combo.SelectedIndex = 0;
    }

    public void ClearItems()
    {
        _combo.Items.Clear();
        _combo.SelectedIndex = -1;
    }
}