// Copyright (c) 2025 Quinn
// Licensed under the MIT Licence. See LICENSE for details
#include "window.h"

#include <glad/gl.h>

#include <GLFW/glfw3.h>
#include <assert.h>

#include "../error.h"
#include "input.h"
#include "render.h"

// macros for ease of access
#define WIN_NAME           "MCA Selector Lite"
#define WIN_DEFAULT_WIDTH  640
#define WIN_DEFAULT_HEIGHT 480

static GLFWwindow *win = NULL;

int window_init(void) {
#ifndef NDEBUG
	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);
#endif

	// initialize the window
	glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // sets the profile to "core", so old, deprecated functions are disabled.
	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
	glfwWindowHint(GLFW_RED_BITS, 8);
	glfwWindowHint(GLFW_GREEN_BITS, 8);
	glfwWindowHint(GLFW_BLUE_BITS, 8);
	glfwWindowHint(GLFW_ALPHA_BITS, 0);
	win = glfwCreateWindow(WIN_DEFAULT_WIDTH, WIN_DEFAULT_HEIGHT, WIN_NAME, NULL, NULL);
	if (!win) return 1;

	// setup OpenGL for the window
	glfwMakeContextCurrent(win);
	if (!gladLoadGL(glfwGetProcAddress)) return 1;
	glfwSwapInterval(1); // wait 1 screen update for a redraw a.k.a. "vsync". (not really applicable in this case but eh)

	// configure callbacks
	glfwSetKeyCallback(win, key_callback);

	// print the OpenGL version information
	debug(
		"version info:\n"
		"\tvendor:       %s\n"
		"\trenderer:     %s\n"
		"\tversion:      %s\n"
		"\tshading lang: %s\n",
		glGetString(GL_VENDOR),
		glGetString(GL_RENDERER),
		glGetString(GL_VERSION),
		glGetString(GL_SHADING_LANGUAGE_VERSION));

	return 0;
}

void window_loop(void) {
	assert(win != NULL);

	render_init();
	while (!glfwWindowShouldClose(win)) {
		glfwWaitEvents(); // wait till an update has been given

		render_update(win);
		glfwSwapBuffers(win);
	}

	glfwDestroyWindow(win);
}