﻿namespace Xilium.CefGlue;

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using Xilium.CefGlue.Interop;

/// <summary>
/// Implement this interface to handle events related to keyboard input. The
/// methods of this class will be called on the UI thread.
/// </summary>
public abstract unsafe partial class CefKeyboardHandler
{
    private int on_pre_key_event(cef_keyboard_handler_t* self, cef_browser_t* browser, cef_key_event_t* @event, IntPtr os_event, int* is_keyboard_shortcut)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);
        var m_event = CefKeyEvent.FromNative(@event);
        // TODO: wrap cef_event_handle_t (os_event)
        IntPtr m_os_event = IntPtr.Zero;
        if (os_event != IntPtr.Zero)
        {
        }

        var m_is_keyboard_shortcut = *is_keyboard_shortcut != 0;

        var result = OnPreKeyEvent(m_browser, m_event, m_os_event, out m_is_keyboard_shortcut);
        *is_keyboard_shortcut = m_is_keyboard_shortcut ? 1 : 0;

        return result ? 1 : 0;
    }

    /// <summary>
    /// Called before a keyboard event is sent to the renderer. |event| contains
    /// information about the keyboard event. |os_event| is the operating system
    /// event message, if any. Return true if the event was handled or false
    /// otherwise. If the event will be handled in OnKeyEvent() as a keyboard
    /// shortcut set |is_keyboard_shortcut| to true and return false.
    /// </summary>
    protected virtual bool OnPreKeyEvent(CefBrowser browser, CefKeyEvent keyEvent, IntPtr os_event, out bool isKeyboardShortcut)
    {
        isKeyboardShortcut = false;
        return false;
    }


    private int on_key_event(cef_keyboard_handler_t* self, cef_browser_t* browser, cef_key_event_t* @event, IntPtr os_event)
    {
        CheckSelf(self);

        var m_browser = CefBrowser.FromNative(browser);
        var m_event = CefKeyEvent.FromNative(@event);
        // TODO: wrap cef_event_handle_t (os_event)
        IntPtr m_os_event = IntPtr.Zero;
        if (os_event != IntPtr.Zero)
        {
        }

        var result = OnKeyEvent(m_browser, m_event, m_os_event);

        return result ? 1 : 0;
    }

    /// <summary>
    /// Called after the renderer and JavaScript in the page has had a chance to
    /// handle the event. |event| contains information about the keyboard event.
    /// |os_event| is the operating system event message, if any. Return true if
    /// the keyboard event was handled or false otherwise.
    /// </summary>
    protected virtual bool OnKeyEvent(CefBrowser browser, CefKeyEvent keyEvent, IntPtr osEvent)
    {
        return false;
    }
}
