using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Workplace.Resources;

namespace Workplace.Forms
{
    public enum Selection
    {
        Submenu,
        Leave,
        Back,
        Invalid,
    }

    public class WizardMenu
    {
        public readonly string DirPath;
        public readonly ListBox ListBox;
        public readonly string Title;
        public readonly string[] Options;

        public Selection Selection
        {
            get
            {
                if (ListBox.SelectedIndex == Options.Length)
                {
                    return Selection.Back;
                }

                if (ListBox.SelectedIndex < 0 || ListBox.SelectedIndex > Options.Length || !Directory.Exists(SelectedPath))
                {
                    return Selection.Invalid;
                }

                if (File.Exists(SelectedFile))
                {
                    return Selection.Leave;
                }

                return Selection.Submenu;
            }
        }

        /// Use the follwong properties only when Selection is Submenu or Leave
        public string SelectedOption { get { return Options[ListBox.SelectedIndex]; } }
        public string SelectedPath { get { return String.Format(@"{0}\{1}", DirPath, Options[ListBox.SelectedIndex]); } }
        public string SelectedFile { get { return String.Format(@"{0}\{1}\weight.txt", DirPath, Options[ListBox.SelectedIndex]); } }


        public WizardMenu(string dirPath, string title, int height)
        {
            DirPath = dirPath;
            Title = title;

            ListBox = new ListBox();

            int maxWidth = 0;
            Options = Directory.Exists(dirPath) ? Directory.GetDirectories(dirPath) : new string[0];
            for (int i = 0; i < Options.Length; i++)
            {
                Options[i] = Path.GetFileName(Options[i]);
                ListBox.Items.Add(Options[i]);
                Size size = TextRenderer.MeasureText(Options[i], ListBox.Font);
                if (size.Width > maxWidth) maxWidth = size.Width;
            }

            ListBox.Items.Add(string.Format("<{0}>", Strings.back));
            ListBox.Width = maxWidth + 20;
            ListBox.Height = height;
        }

        public void Enable(EventHandler eventHandler)
        {
            ListBox.Enabled = true;
            ListBox.SelectedIndexChanged += eventHandler;
        }

        public void Disable(EventHandler eventHandler)
        {
            ListBox.Enabled = false;
            ListBox.SelectedIndexChanged -= eventHandler;
        }
    }
}