using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using Utilities;

namespace key_preview
{
    public partial class Form1 : Form
    {
        globalKeyboardHook gkh = new globalKeyboardHook();

        #region [ Properties ]
        List<string> CopiedTexts { get; set; }
        bool HoldCtrl { get; set; }
        bool HoldC { get; set; }
        bool HoldV { get; set; }
        bool HoldTab { get; set; }
        bool VPressedMultiple { get; set; }
        string CopiedText { get; set; }
        int StringIdxInArrayList { get; set; }
        #endregion

        #region [ Constructors ]
        public Form1()
        {
            InitializeComponent();
            gkh.HookedKeys.Add(Keys.C);
            gkh.HookedKeys.Add(Keys.V);
            gkh.HookedKeys.Add(Keys.LControlKey);
            gkh.HookedKeys.Add(Keys.Tab);
            gkh.KeyDown += new KeyEventHandler(Form1_KeyDown);
            gkh.KeyUp += new KeyEventHandler(Form1_KeyUp);
            HoldC = false;
            HoldV = false;
            CopiedTexts = new List<string>();
        }
        #endregion

        #region [ Events ]
        private void Form1_Load(object sender, EventArgs e) {}

        void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.LControlKey)
            {
                HoldCtrl = true;
            }
            else if (e.KeyCode == Keys.C)
                HoldC = true;
            else if (e.KeyCode == Keys.V)
                HoldV = true;
            else if (e.KeyCode == Keys.Tab)
                HoldTab = true;

            WaitForOtherKeys(e);
        }

        void Form1_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.LControlKey)
            {
                HoldCtrl = false;
            }
            else if (e.KeyCode == Keys.C)
                HoldC = false;
            else if (e.KeyCode == Keys.V)
            {
                HoldV = false;
                VPressedMultiple = false;
            }

            else if (e.KeyCode == Keys.Tab)
                HoldTab = false;

            WaitForOtherKeys(e);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            CopiedTexts.Clear();
            Clipboard.Clear();
        }
        #endregion

        #region [ Methods ]
        void WaitForOtherKeys(KeyEventArgs e)
        {
            if (HoldCtrl)
            {
                if (HoldC)
                {
                    CopiedText = Clipboard.GetText();
                    Clipboard.SetText(CopiedText);
                    CopiedTexts.Add(CopiedText);
                    StringIdxInArrayList = CopiedTexts.Count - 1;

                    HoldC = false;
                }
                else if (HoldV)
                {
                    if (VPressedMultiple)
                    {
                        if (StringIdxInArrayList > 0)
                            StringIdxInArrayList--;
                        else if (StringIdxInArrayList <= 0)
                            StringIdxInArrayList = CopiedTexts.Count - 1;
                    }
                    Clipboard.SetText(CopiedTexts[StringIdxInArrayList]);
                    HoldV = false;
                    VPressedMultiple = true;
                }
            }
        }
        #endregion
    }

}