/*
 * This source file is part of RmlUi, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://github.com/mikke89/RmlUi
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 * Copyright (c) 2019 The RmlUi Team, and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#ifndef RMLUI_BACKENDS_PLATFORM_GLFW_H
#define RMLUI_BACKENDS_PLATFORM_GLFW_H

#include <RmlUi/Core/Input.h>
#include <RmlUi/Core/SystemInterface.h>
#include <RmlUi/Core/Types.h>
#include <GLFW/glfw3.h>

class SystemInterface_GLFW : public Rml::SystemInterface {
public:
	SystemInterface_GLFW();
	~SystemInterface_GLFW();

	// Optionally, provide or change the window to be used for setting the mouse cursors and clipboard text.
	void SetWindow(GLFWwindow* window);

	// -- Inherited from Rml::SystemInterface  --

	double GetElapsedTime() override;

	void SetMouseCursor(const Rml::String& cursor_name) override;

	void SetClipboardText(const Rml::String& text) override;
	void GetClipboardText(Rml::String& text) override;

private:
	GLFWwindow* window = nullptr;

	GLFWcursor* cursor_pointer = nullptr;
	GLFWcursor* cursor_cross = nullptr;
	GLFWcursor* cursor_text = nullptr;
};

/**
    Optional helper functions for the GLFW plaform.
 */
namespace RmlGLFW {

// The following optional functions are intended to be called from their respective GLFW callback functions. The functions expect arguments passed
// directly from GLFW, in addition to the RmlUi context to apply the input or sizing event on. The input callbacks return true if the event is
// propagating, i.e. was not handled by the context.
bool ProcessKeyCallback(Rml::Context* context, int key, int action, int mods);
bool ProcessCharCallback(Rml::Context* context, unsigned int codepoint);
bool ProcessCursorEnterCallback(Rml::Context* context, int entered);
bool ProcessCursorPosCallback(Rml::Context* context, double xpos, double ypos, int mods);
bool ProcessMouseButtonCallback(Rml::Context* context, int button, int action, int mods);
bool ProcessScrollCallback(Rml::Context* context, double yoffset, int mods);
void ProcessFramebufferSizeCallback(Rml::Context* context, int width, int height);
void ProcessContentScaleCallback(Rml::Context* context, float xscale);

// Converts the GLFW key to RmlUi key.
Rml::Input::KeyIdentifier ConvertKey(int glfw_key);

// Converts the GLFW key modifiers to RmlUi key modifiers.
int ConvertKeyModifiers(int glfw_mods);

} // namespace RmlGLFW

#endif