#include "fastfetch.h"
#include "opengl.h"

#define GL_SILENCE_DEPRECATION
#include <OpenGL/gl.h>
#include <OpenGL/OpenGL.h> // This brings in CGL, not GL

void ffOpenGLHandleResult(FFOpenGLResult* result, __typeof__(&glGetString) ffglGetString);

static const char* cglHandleContext(FFOpenGLResult* result, CGLContextObj context)
{
    if(CGLSetCurrentContext(context) != kCGLNoError)
        return "CGLSetCurrentContext() failed";

    ffOpenGLHandleResult(result, &glGetString);

    GLint major, minor;
    CGLGetVersion(&major, &minor);
    ffStrbufSetF(&result->library, "CGL %d.%d", major, minor);

    return NULL;
}

static const char* cglHandlePixelFormat(FFOpenGLResult* result, CGLPixelFormatObj pixelFormat)
{
    CGLContextObj context;

    if(CGLCreateContext(pixelFormat, NULL, &context) != kCGLNoError)
        return "CGLCreateContext() failed";

    const char* error = cglHandleContext(result, context);
    CGLDestroyContext(context);
    return error;
}

const char* cglDetectOpenGL(FFOpenGLResult* result)
{
    CGLPixelFormatObj pixelFormat;
    CGLPixelFormatAttribute attrs[] = {
        kCGLPFAOpenGLProfile, (CGLPixelFormatAttribute) kCGLOGLPVersion_3_2_Core,
        kCGLPFAAccelerated,
        0
    };

    GLint num;
    if (CGLChoosePixelFormat(attrs, &pixelFormat, &num) != kCGLNoError)
        return "CGLChoosePixelFormat() failed";

    const char* error = cglHandlePixelFormat(result, pixelFormat);
    CGLDestroyPixelFormat(pixelFormat);
    return error;
}

const char* ffDetectOpenGL(FFOpenGLOptions* options, FFOpenGLResult* result)
{
    if (options->library == FF_OPENGL_LIBRARY_AUTO)
        return cglDetectOpenGL(result);
    else if (options->library == FF_OPENGL_LIBRARY_EGL)
    {
        #if __has_include(<EGL/egl.h>)
        const char* ffOpenGLDetectByEGL(FFOpenGLResult* result);
        return ffOpenGLDetectByEGL(result);
        #else
        return "fastfetch was compiled without egl support";
        #endif
    }
    else
        return "Unsupported OpenGL library";
}