#ifdef B3_USE_GLFW
#include "GLFWOpenGLWindow.h"

#include <glad/gl.h>
#include <GLFW/glfw3.h>

#include <stdlib.h>
#include <stdio.h>
#include "LinearMath/btScalar.h"

struct GLFWOpenGLWindowInternalData
{
	bool m_requestedExit;
	bool m_hasCursorPos;
	bool m_altPressed;
	bool m_shiftPressed;
	bool m_ctrlPressed;
	float m_cursorXPos;
	float m_cursorYPos;
	b3MouseMoveCallback m_mouseMoveCallback;
	b3MouseButtonCallback m_mouseButtonCallback;
	b3ResizeCallback m_resizeCallback;
	b3WheelCallback m_wheelCallback;
	b3KeyboardCallback m_keyboardCallback;
	b3RenderCallback m_renderCallback;
	int m_width;
	int m_height;
	float m_retinaScaleFactor;

	GLFWwindow* m_glfwWindow;

	GLFWOpenGLWindowInternalData()
		: m_requestedExit(false),
		  m_hasCursorPos(false),
		  m_altPressed(false),
		  m_shiftPressed(false),
		  m_ctrlPressed(false),
		  m_cursorXPos(0),
		  m_cursorYPos(0),
		  m_mouseMoveCallback(0),
		  m_mouseButtonCallback(0),
		  m_resizeCallback(0),
		  m_wheelCallback(0),
		  m_keyboardCallback(0),
		  m_renderCallback(0),
		  m_width(0),
		  m_height(0),
		  m_retinaScaleFactor(1),
		  m_glfwWindow(0)
	{
	}
};

static void GLFWErrorCallback(int error, const char* description)
{
	fprintf(stderr, "Error: %s\n", description);
}

static void GLFWMouseButtonCallback(GLFWwindow* window, int button, int glfwState, int)
{
	GLFWOpenGLWindow* wnd = (GLFWOpenGLWindow*)glfwGetWindowUserPointer(window);
	if (wnd && wnd->getMouseButtonCallback())
	{
		int state = (glfwState == GLFW_PRESS) ? 1 : 0;
		wnd->mouseButtonCallbackInternal(button, state);
	}
}

static void GLFWScrollCallback(GLFWwindow* window, double deltaX, double deltaY)
{
	GLFWOpenGLWindow* wnd = (GLFWOpenGLWindow*)glfwGetWindowUserPointer(window);
	if (wnd && wnd->getWheelCallback())
	{
		wnd->getWheelCallback()(deltaX * 100, deltaY * 100);
	}
}

static void GLFWCursorPosCallback(GLFWwindow* window, double xPos, double yPos)
{
	GLFWOpenGLWindow* wnd = (GLFWOpenGLWindow*)glfwGetWindowUserPointer(window);
	if (wnd && wnd->getMouseMoveCallback())
	{
		wnd->mouseCursorCallbackInternal(xPos, yPos);
	}
}

static void GLFWKeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
	GLFWOpenGLWindow* wnd = (GLFWOpenGLWindow*)glfwGetWindowUserPointer(window);
	if (wnd)
	{
		wnd->keyboardCallbackInternal(key, action);
	}
	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
	{
		glfwSetWindowShouldClose(window, GLFW_TRUE);
	}
}

static void GLFWSizeCallback(GLFWwindow* window, int width, int height)
{
	GLFWOpenGLWindow* wnd = (GLFWOpenGLWindow*)glfwGetWindowUserPointer(window);
	{
		wnd->resizeInternal(width, height);
	}
}

GLFWOpenGLWindow::GLFWOpenGLWindow()
{
	m_data = new GLFWOpenGLWindowInternalData();
}

GLFWOpenGLWindow::~GLFWOpenGLWindow()
{
	if (m_data->m_glfwWindow)
	{
		closeWindow();
	}
	delete m_data;
}

int getBulletKeyFromGLFWKeycode(int glfwKeyCode)
{
	int keycode = -1;
	if (glfwKeyCode >= 'A' && glfwKeyCode <= 'Z')
	{
		return glfwKeyCode + 32;  //todo: fix the ascii A vs a input
	}
	if (glfwKeyCode >= '0' && glfwKeyCode <= '9')
	{
		return glfwKeyCode;
	}

	switch (glfwKeyCode)
	{
		case GLFW_KEY_ENTER:
		{
			keycode = B3G_RETURN;
			break;
		};
		case GLFW_KEY_ESCAPE:
		{
			keycode = B3G_ESCAPE;
			break;
		};
		case GLFW_KEY_F1:
		{
			keycode = B3G_F1;
			break;
		}
		case GLFW_KEY_F2:
		{
			keycode = B3G_F2;
			break;
		}
		case GLFW_KEY_F3:
		{
			keycode = B3G_F3;
			break;
		}
		case GLFW_KEY_F4:
		{
			keycode = B3G_F4;
			break;
		}
		case GLFW_KEY_F5:
		{
			keycode = B3G_F5;
			break;
		}
		case GLFW_KEY_F6:
		{
			keycode = B3G_F6;
			break;
		}
		case GLFW_KEY_F7:
		{
			keycode = B3G_F7;
			break;
		}
		case GLFW_KEY_F8:
		{
			keycode = B3G_F8;
			break;
		}
		case GLFW_KEY_F9:
		{
			keycode = B3G_F9;
			break;
		}
		case GLFW_KEY_F10:
		{
			keycode = B3G_F10;
			break;
		}

			//case GLFW_KEY_SPACE: {keycode= ' '; break;}

		case GLFW_KEY_PAGE_DOWN:
		{
			keycode = B3G_PAGE_DOWN;
			break;
		}
		case GLFW_KEY_PAGE_UP:
		{
			keycode = B3G_PAGE_UP;
			break;
		}

		case GLFW_KEY_INSERT:
		{
			keycode = B3G_INSERT;
			break;
		}
		case GLFW_KEY_BACKSPACE:
		{
			keycode = B3G_BACKSPACE;
			break;
		}
		case GLFW_KEY_DELETE:
		{
			keycode = B3G_DELETE;
			break;
		}

		case GLFW_KEY_END:
		{
			keycode = B3G_END;
			break;
		}
		case GLFW_KEY_HOME:
		{
			keycode = B3G_HOME;
			break;
		}
		case GLFW_KEY_LEFT:
		{
			keycode = B3G_LEFT_ARROW;
			break;
		}
		case GLFW_KEY_UP:
		{
			keycode = B3G_UP_ARROW;
			break;
		}
		case GLFW_KEY_RIGHT:
		{
			keycode = B3G_RIGHT_ARROW;
			break;
		}
		case GLFW_KEY_DOWN:
		{
			keycode = B3G_DOWN_ARROW;
			break;
		}
		case GLFW_KEY_RIGHT_SHIFT:
		{
			keycode = B3G_SHIFT;
			break;
		}
		case GLFW_KEY_LEFT_SHIFT:
		{
			keycode = B3G_SHIFT;
			break;
		}
		case GLFW_KEY_MENU:
		{
			keycode = B3G_ALT;
			break;
		}
		case GLFW_KEY_RIGHT_CONTROL:
		{
			keycode = B3G_CONTROL;
			break;
		}
		case GLFW_KEY_LEFT_CONTROL:
		{
			keycode = B3G_CONTROL;
			break;
		}
		default:
		{
			//keycode = MapVirtualKey( virtualKeyCode, MAPGLFW_KEY_GLFW_KEY_TO_CHAR ) & 0x0000FFFF;
		}
	};

	return keycode;
}

void GLFWOpenGLWindow::keyboardCallbackInternal(int key, int state)
{
	if (getKeyboardCallback())
	{
		//convert keyboard codes from glfw to bullet
		int btcode = getBulletKeyFromGLFWKeycode(key);
		int btstate = (state == GLFW_RELEASE) ? 0 : 1;

		switch (btcode)
		{
			case B3G_SHIFT:
			{
				m_data->m_shiftPressed = state != 0;
				break;
			}
			case B3G_ALT:
			{
				m_data->m_altPressed = state != 0;
				break;
			}
			case B3G_CONTROL:
			{
				m_data->m_ctrlPressed = state != 0;
				break;
			}
			default:
			{
			}
		}

		getKeyboardCallback()(btcode, btstate);
	}
}

void GLFWOpenGLWindow::mouseButtonCallbackInternal(int button, int state)
{
	if (getMouseButtonCallback() && m_data->m_hasCursorPos)
	{
		getMouseButtonCallback()(button, state, m_data->m_cursorXPos, m_data->m_cursorYPos);
	}
}

void GLFWOpenGLWindow::mouseCursorCallbackInternal(double xPos, double yPos)
{
	if (getMouseMoveCallback())
	{
		m_data->m_hasCursorPos = true;
		m_data->m_cursorXPos = xPos;
		m_data->m_cursorYPos = yPos;
		getMouseMoveCallback()(xPos, yPos);
	}
}

void GLFWOpenGLWindow::resizeInternal(int width, int height)
{
	glfwGetFramebufferSize(m_data->m_glfwWindow, &m_data->m_width, &m_data->m_height);
	glViewport(0, 0, m_data->m_width, m_data->m_height);

	if (getResizeCallback())
	{
		getResizeCallback()(m_data->m_width / m_data->m_retinaScaleFactor, m_data->m_height / m_data->m_retinaScaleFactor);
	}
}

void GLFWOpenGLWindow::createDefaultWindow(int width, int height, const char* title)
{
	b3gWindowConstructionInfo ci;
	ci.m_width = width;
	ci.m_height = height;
	ci.m_title = title;

	createWindow(ci);
}

void GLFWOpenGLWindow::createWindow(const b3gWindowConstructionInfo& ci)
{
	btAssert(m_data->m_glfwWindow == 0);
	if (m_data->m_glfwWindow == 0)
	{
		glfwSetErrorCallback(GLFWErrorCallback);

		if (!glfwInit())
			exit(EXIT_FAILURE);

		if (ci.m_openglVersion == 2)
		{
			glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
			glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
		}
		else
		{
			glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
			glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
			glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
			glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
		}

		m_data->m_glfwWindow = glfwCreateWindow(ci.m_width, ci.m_height, ci.m_title, NULL, NULL);

		if (!m_data->m_glfwWindow)
		{
			glfwTerminate();
			exit(EXIT_FAILURE);
		}

		glfwSetKeyCallback(m_data->m_glfwWindow, GLFWKeyCallback);
		glfwSetMouseButtonCallback(m_data->m_glfwWindow, GLFWMouseButtonCallback);

		glfwSetCursorPosCallback(m_data->m_glfwWindow, GLFWCursorPosCallback);
		glfwSetScrollCallback(m_data->m_glfwWindow, GLFWScrollCallback);

		glfwSetWindowSizeCallback(m_data->m_glfwWindow, GLFWSizeCallback);
		glfwSetWindowUserPointer(m_data->m_glfwWindow, this);

		glfwMakeContextCurrent(m_data->m_glfwWindow);
		gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
		glfwSwapInterval(0);  //1);
		glfwGetFramebufferSize(m_data->m_glfwWindow, &m_data->m_width, &m_data->m_height);
		int windowWidth, windowHeight;
		glfwGetWindowSize(m_data->m_glfwWindow, &windowWidth, &windowHeight);
		m_data->m_retinaScaleFactor = float(m_data->m_width) / float(windowWidth);
		glViewport(0, 0, m_data->m_width, m_data->m_height);
	}
}

void GLFWOpenGLWindow::closeWindow()
{
	if (m_data->m_glfwWindow)
	{
		glfwDestroyWindow(m_data->m_glfwWindow);

		glfwTerminate();
		m_data->m_glfwWindow = 0;
	}
}

void GLFWOpenGLWindow::runMainLoop()
{
}

float GLFWOpenGLWindow::getTimeInSeconds()
{
	return 0.f;
}

bool GLFWOpenGLWindow::requestedExit() const
{
	bool shouldClose = m_data->m_requestedExit;

	if (m_data->m_glfwWindow)
	{
		shouldClose = shouldClose || glfwWindowShouldClose(m_data->m_glfwWindow);
	}
	return shouldClose;
}

void GLFWOpenGLWindow::setRequestExit()
{
	if (m_data->m_glfwWindow)
	{
		glfwSetWindowShouldClose(m_data->m_glfwWindow, GLFW_TRUE);
	}
	m_data->m_requestedExit = true;
}

void GLFWOpenGLWindow::startRendering()
{
	if (m_data->m_glfwWindow)
	{
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
	}
}

void GLFWOpenGLWindow::endRendering()
{
	glfwPollEvents();
	glfwSwapBuffers(m_data->m_glfwWindow);
}

bool GLFWOpenGLWindow::isModifierKeyPressed(int key)
{
	bool result = false;

	switch (key)
	{
		case B3G_SHIFT:
		{
			result = m_data->m_shiftPressed;
			break;
		}
		case B3G_ALT:
		{
			result = m_data->m_altPressed;
			break;
		}
		case B3G_CONTROL:
		{
			result = m_data->m_ctrlPressed;
			break;
		}
		default:
		{
		}
	}
	return result;
}

void GLFWOpenGLWindow::setMouseMoveCallback(b3MouseMoveCallback mouseCallback)
{
	m_data->m_mouseMoveCallback = mouseCallback;
}

b3MouseMoveCallback GLFWOpenGLWindow::getMouseMoveCallback()
{
	return m_data->m_mouseMoveCallback;
}

void GLFWOpenGLWindow::setMouseButtonCallback(b3MouseButtonCallback mouseCallback)
{
	m_data->m_mouseButtonCallback = mouseCallback;
}

b3MouseButtonCallback GLFWOpenGLWindow::getMouseButtonCallback()
{
	return m_data->m_mouseButtonCallback;
}

void GLFWOpenGLWindow::setResizeCallback(b3ResizeCallback resizeCallback)
{
	m_data->m_resizeCallback = resizeCallback;
	getResizeCallback()(m_data->m_width / getRetinaScale(), m_data->m_height / getRetinaScale());
}

b3ResizeCallback GLFWOpenGLWindow::getResizeCallback()
{
	return m_data->m_resizeCallback;
}

void GLFWOpenGLWindow::setWheelCallback(b3WheelCallback wheelCallback)
{
	m_data->m_wheelCallback = wheelCallback;
}

b3WheelCallback GLFWOpenGLWindow::getWheelCallback()
{
	return m_data->m_wheelCallback;
}

void GLFWOpenGLWindow::setKeyboardCallback(b3KeyboardCallback keyboardCallback)
{
	m_data->m_keyboardCallback = keyboardCallback;
}

b3KeyboardCallback GLFWOpenGLWindow::getKeyboardCallback()
{
	return m_data->m_keyboardCallback;
}

void GLFWOpenGLWindow::setRenderCallback(b3RenderCallback renderCallback)
{
	m_data->m_renderCallback = renderCallback;
}

void GLFWOpenGLWindow::setWindowTitle(const char* title)
{
	if (m_data->m_glfwWindow)
	{
		glfwSetWindowTitle(m_data->m_glfwWindow, title);
	}
}

float GLFWOpenGLWindow::getRetinaScale() const
{
	return m_data->m_retinaScaleFactor;
}
void GLFWOpenGLWindow::setAllowRetina(bool allow)
{
}

int GLFWOpenGLWindow::getWidth() const
{
	if (m_data->m_glfwWindow)
	{
		glfwGetFramebufferSize(m_data->m_glfwWindow, &m_data->m_width, &m_data->m_height);
	}
	int width = m_data->m_width / m_data->m_retinaScaleFactor;
	return width;
}
int GLFWOpenGLWindow::getHeight() const
{
	if (m_data->m_glfwWindow)
	{
		glfwGetFramebufferSize(m_data->m_glfwWindow, &m_data->m_width, &m_data->m_height);
	}
	return m_data->m_height / m_data->m_retinaScaleFactor;
}

int GLFWOpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength)
{
	return 0;
}

#endif  //B3_USE_GLFW