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

namespace ShortcutUtil
{
    public partial class MainForm : Form
    {
        private EntryList entryList;

        private Font defaultFont;
        private Font nameFont;
        private Brush fontBrush;

        private bool shown = false;
        private Size listSizeOffset;
        private Point buttonOffset;

        public MainForm(EntryList entryList)
        {
            InitializeComponent();

            defaultFont = label1.Font;
            nameFont = new Font(defaultFont, FontStyle.Bold);
            fontBrush = new SolidBrush(label1.ForeColor);

            this.entryList = entryList;

            entryListBox.Items.AddRange(this.entryList.Entries.ToArray());
        }

        private Dictionary<Tuple<string, int, Size>, Icon> iconsByFileIndex = new Dictionary<Tuple<string, int, Size>, Icon>();
        private Icon GetIcon(string file, int index, Size preferred)
        {
            Tuple<string, int, Size> key = new Tuple<string, int, Size>(file, index, preferred);

            
            
            if (!iconsByFileIndex.ContainsKey(key))
            {
                Icon icon = null;

                try
                {
                    icon = new Icon(file, preferred);

                    if (icon != null)
                    {
                        iconsByFileIndex.Add(key, icon);
                        return icon;
                    }
                } catch (Exception) { }

                try
                {
                    icon = IconExtractor.Extract(file, index, true);
                    if (icon != null)
                    {
                        iconsByFileIndex.Add(key, icon);
                        return icon;
                    }
                }
                catch (Exception) { }

                MessageBox.Show("Couldn't load icon " + index + " from " + file);
                return null;
            }

            return iconsByFileIndex[key];
        }

        private static readonly Size IconSize = new Size(64, 64);
        private static readonly Size ItemPadding = new Size(6, 6);

        private void entryListBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            e.DrawBackground();
            e.DrawFocusRectangle();

            if (e.Index >= 0 && e.Index < entryList.Entries.Count)
            {
                Rectangle iconBounds = new Rectangle(Point.Add(e.Bounds.Location, ItemPadding), IconSize);

                Size textSize = new Size(0, nameFont.Height + 2);

                Entry entry = entryList.Entries[e.Index];
                e.Graphics.DrawIcon(GetIcon(entry.Icon, entry.IconIndex, IconSize), iconBounds);

                PointF textLocation = PointF.Add(e.Bounds.Location, new Size(IconSize.Width + ItemPadding.Width * 2, ItemPadding.Width));

                e.Graphics.DrawString(e.Index + ": " + entry.Name, nameFont, fontBrush, textLocation);
                textLocation = PointF.Add(textLocation, textSize);

                e.Graphics.DrawString(entry.Target, defaultFont, fontBrush, textLocation);
                textLocation = PointF.Add(textLocation, textSize);

                e.Graphics.DrawString(entry.Description, defaultFont, fontBrush, textLocation);
                textLocation = PointF.Add(textLocation, textSize);
            }
        }

        private void entryListBox_MeasureItem(object sender, MeasureItemEventArgs e)
        {
            e.ItemHeight = Size.Add(IconSize, new Size(0, ItemPadding.Height * 2)).Height;
        }

        private void MainForm_SizeChanged(object sender, EventArgs e)
        {
            if (shown)
            {
                entryListBox.Size = Size.Subtract(Size, listSizeOffset);
                createButton.Location = Point.Add(buttonOffset, entryListBox.Size);
            }
        }

        private void MainForm_Shown(object sender, EventArgs e)
        {
            listSizeOffset = Size.Subtract(Size, entryListBox.Size);
            buttonOffset = Point.Subtract(createButton.Location, entryListBox.Size);

            shown = true;
        }
    }
}