using CefSharp;
using System.Windows.Forms;

namespace CMS_Client.Browser_Tools
{
    class CefBrowserKeyHandler : IKeyboardHandler
    {
        //Const value of F1..F12 Keys
        const int KeyF1 = 112;
        const int KeyF2 = 113;
        const int KeyF3 = 114;
        const int KeyF4 = 115;
        const int KeyF5 = 116;
        const int KeyF6 = 117;
        const int KeyF7 = 118;
        const int KeyF8 = 119;
        const int KeyF9 = 120;
        const int KeyF10= 121;
        const int KeyF11= 122;
        const int KeyF12= 123;
        const int KeyShift  = 16;
        const int KeyCtrl   = 17;
        const int KeyAlt    = 18;

        //Check Hotkey Pressed
        bool AltPressed     = false;
        bool ShiftPressed   = false;
        bool CtrlPressed    = false;



        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        #region GLOBAL_METHODS

        //Metod called by Browser when a key is pressed
        public bool OnKeyEvent(IWebBrowser browserControl, IBrowser browser, KeyType type, int windowsKeyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey)
        {
            //Check only if it a Key-Down event
            if(type == KeyType.KeyDown || type == KeyType.RawKeyDown)
            {
                //Elaborates Hotkeys
                KeyDwHotkeys(windowsKeyCode);

                //Filter the FKey only if is with ALT key
                if(AltPressed)
                {
                    //Do things different by F Keys
                    switch (windowsKeyCode)
                    {
                        //F1 -> Go to Back page
                        case KeyF1:     browser.GoBack(); break;

                        //F2 -> Go to Next page
                        case KeyF2:     browser.GoForward(); break;

                        //F5 -> Reload this page
                        case KeyF5:     browser.Reload(true); break;

                        //F12 -> Show Dev Tools
                        case KeyF12:    browser.ShowDevTools(); break;

                        //F4 -> Exit application
                        case KeyF4:     Application.Exit(); break;

                    }
                    return true;
                }
                
            }

            //Check only if it a Key-Up event
            else if (type == KeyType.KeyUp)

                //Elaborates Hotkeys
                KeyUpHotkeys(windowsKeyCode);

            return false;
        }
        


        //Metod called by Browser when a key is pre-pressed
        public bool OnPreKeyEvent(IWebBrowser browserControl, IBrowser browser, KeyType type, int windowsKeyCode, int nativeKeyCode, CefEventFlags modifiers, bool isSystemKey, ref bool isKeyboardShortcut)
        {
            return false;
        }

        #endregion

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        #region PRIVATE_CUSTOM_METHODS

        private void KeyDwHotkeys(int windowsKeyCode)
        {
            if (windowsKeyCode == KeyShift)
                ShiftPressed = true;
            else if(windowsKeyCode == KeyCtrl)
                CtrlPressed = true;
            else if (windowsKeyCode == KeyAlt)
                AltPressed = true;
        }



        private void KeyUpHotkeys(int windowsKeyCode)
        {
            if (windowsKeyCode == KeyShift)
                ShiftPressed = false;
            else if (windowsKeyCode == KeyCtrl)
                CtrlPressed = false;
            else if (windowsKeyCode == KeyAlt)
                AltPressed = false;
        }

        #endregion

    }
}