#define GLAD_GL_IMPLEMENTATION
#include "glad/gl.h"
#define GLFW_INCLUDE_NONE
#include "GLFW/glfw3.h"

static void key_callback(GLFWwindow *w, int key, int scancode, int action, int mods) {
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) {
        glfwSetWindowShouldClose(w, GL_TRUE);
    }
}

int main() {
    // Initialise GLFW
    if (!glfwInit()) {
        exit(EXIT_FAILURE);
    }

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
    // Create our context
    GLFWwindow *w = glfwCreateWindow(640, 480, "Test", NULL, NULL);
    if (!w) {
        glfwTerminate();
        exit(EXIT_FAILURE);
    }
    glfwMakeContextCurrent(w);
    glfwSwapInterval(1); // Essentially vsync
    gladLoadGL(glfwGetProcAddress); // Load openGL using glfw

    // Set up the key handler
    glfwSetKeyCallback(w, key_callback);

    // Configure the context's capabilities
    glClearColor(1.0, 0.0, 0.0, 1.0);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_BLEND); // Maybe this allows transparency?
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    // TODO: Actually make some opengl shit happen
    
    // Main Loop
    while(!glfwWindowShouldClose(w)) {
        /*
        int width, height;
        glfwGetFramebufferSize(w, &width, &height);

        glViewport(0, 0, width, height);
        glClear(GL_COLOR_BUFFER_BIT);
        */

        // TODO Draw primitives

        glfwSwapBuffers(w);
        glfwPollEvents();
    }

    glfwDestroyWindow(w);
    glfwTerminate();
    exit(EXIT_SUCCESS);
}