#include "../include/mgl/mgl.h"
#include <X11/Xlib.h>
#include <stdio.h>

static mgl_context context;
static int init_count = 0;
static XErrorHandler prev_xerror = NULL;

static int ignore_xerror(Display *display, XErrorEvent *ee) {
    (void)display;
    (void)ee;
    return 0;
}

int mgl_init(void) {
    ++init_count;
    if(init_count == 1) {
        context.connection = XOpenDisplay(NULL);
        if(!context.connection) {
            fprintf(stderr, "XOpenDisplay(NULL) failed\n");
            mgl_deinit();
            return -1;
        }

        prev_xerror = XSetErrorHandler(ignore_xerror);
        if(mgl_glx_load(&context.glx) != 0) {
            mgl_deinit();
            return -1;
        }
    }
    return 0;
}

void mgl_deinit(void) {
    if(init_count == 1) {
        mgl_glx_unload(&context.glx);
        XSetErrorHandler(prev_xerror);
        XCloseDisplay(context.connection);
        context.connection = NULL;
    }

    if(init_count > 0)
        --init_count;
}

mgl_context* mgl_get_context(void) {
    return &context;
}