using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace NumpadMonitor
{
    internal partial class KeyConfig : Form
    {
        private readonly List<KeyHandler> keyHandlers = new List<KeyHandler>();
        private KeyHandler askedKey;
        private readonly bool AlternativeKeySet;

        public KeyConfig(bool alternativeKeyset)
        {
            InitializeComponent();
            AlternativeKeySet = alternativeKeyset;
            KeyInfo[] keyset = alternativeKeyset ? KeySet.Alternative : KeySet.Numpad;
            foreach (KeyInfo key in keyset)
                AddKeyHandler(key);
            AskNextKey();
        }

        private void AddKeyHandler(KeyInfo key)
        {
            KeyHandler keyHandler = new KeyHandler(key, this);
            keyHandler.Register();
            keyHandlers.Add(keyHandler);
        }

        private void AskNextKey()
        {
            KeyHandler keyHandler = keyHandlers.Find(x => x.KeyInfo.KeyCode == IntPtr.Zero);
            if (keyHandler == null)
            {
                KeyCodeReaderWriter.Write(keyHandlers);
                DisposeElements();
                Close();
                return;
            }
            AskKey(keyHandler);
        }

        private void AskKey(KeyHandler keyHandler)
        {
            askedKey = keyHandler;
            label_key.Text = AlternativeKeySet ? KeySet.AlternativeToNumpad(keyHandler.KeyInfo).ToString() : keyHandler.KeyInfo.ToString();
        }

        private void HandleHotkey(IntPtr LParam)
        {
            label_keyCode.Text = LParam.ToInt64().ToString();
            askedKey.SetKeyCode(LParam);
            AskNextKey();
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == Constants.WM_HOTKEY_MSG_ID)
                HandleHotkey(m.LParam);
            base.WndProc(ref m);
        }

        public void DisposeElements()
        {
            keyHandlers.ForEach(x => x.Unregiser());
        }
    }
}