#include "gl.h"
#include "glfw3.h"
#include "stdio.h"
#include "stdlib.h"
#include <stdbool.h>
#include "main.h"

void main()
{
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    GLFWwindow* window = glfwCreateWindow(800, 600, "Test", NULL, NULL);
    if (window == NULL)
    {
        return -100;
    }

    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    glfwMakeContextCurrent(window);

    context = malloc(sizeof(GladGLContext));
    gladLoadGLContext(context, glfwGetProcAddress);

    unsigned int shader = context->CreateShader(GL_VERTEX_SHADER);
    const GLchar* code[] = { "Test string\0" };
    context->ShaderSource(shader, 1, code, NULL);
    printf("%s\n", code);

    while (!glfwWindowShouldClose(window))
    {
        // input
        // -----
        processInput(window);

        // render
        // ------
        context->ClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        context->Clear(GL_COLOR_BUFFER_BIT);

        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
        // -------------------------------------------------------------------------------
        glfwSwapBuffers(window);
        glfwPollEvents();
    }
    // glfw: terminate, clearing all previously allocated GLFW resources.
    // ------------------------------------------------------------------
    glfwTerminate();
    free(context);
    return 0;
}

// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow* window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}

// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
    // make sure the viewport matches the new window dimensions; note that width and
    // height will be significantly larger than specified on retina displays.
    context->Viewport(0, 0, width, height);
}