/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"

#ifdef SDL_VIDEO_DRIVER_X11

#define DEBUG_DYNAMIC_X11 0

#include "SDL_x11dyn.h"

#if DEBUG_DYNAMIC_X11
#include <stdio.h>
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC

typedef struct
{
    SDL_SharedObject *lib;
    const char *libname;
} x11dynlib;

SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC
);

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XFIXES
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XFIXES
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XFIXES NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC_XTEST
SDL_ELF_NOTE_DLOPEN(
    "x11",
    "Support for video through X11 backend",
    SDL_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
    SDL_VIDEO_DRIVER_X11_DYNAMIC_XTEST
);
#else
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XTEST NULL
#endif

static x11dynlib x11libs[] = {
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XFIXES },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS },
    { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XTEST }
};

static void *X11_GetSym(const char *fnname, int *pHasModule)
{
    int i;
    void *fn = NULL;
    for (i = 0; i < SDL_arraysize(x11libs); i++) {
        if (x11libs[i].lib) {
            fn = SDL_LoadFunction(x11libs[i].lib, fnname);
            if (fn) {
                break;
            }
        }
    }

#if DEBUG_DYNAMIC_X11
    if (fn)
        printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
    else
        printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
#endif

    if (!fn) {
        *pHasModule = 0; // kill this module.
    }

    return fn;
}

#endif // SDL_VIDEO_DRIVER_X11_DYNAMIC

// Define all the function pointers and wrappers...
#define SDL_X11_SYM(rc, fn, params) SDL_DYNX11FN_##fn X11_##fn = NULL;
#include "SDL_x11sym.h"

/* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
#define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
#include "SDL_x11sym.h"

static int x11_load_refcount = 0;

void SDL_X11_UnloadSymbols(void)
{
    // Don't actually unload if more than one module is using the libs...
    if (x11_load_refcount > 0) {
        if (--x11_load_refcount == 0) {
#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
            int i;
#endif

            // set all the function pointers to NULL.
#define SDL_X11_MODULE(modname)                SDL_X11_HAVE_##modname = 0;
#define SDL_X11_SYM(rc, fn, params) X11_##fn = NULL;
#include "SDL_x11sym.h"

#ifdef X_HAVE_UTF8_STRING
            X11_XCreateIC = NULL;
            X11_XGetICValues = NULL;
            X11_XSetICValues = NULL;
            X11_XVaCreateNestedList = NULL;
#endif

#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
            for (i = 0; i < SDL_arraysize(x11libs); i++) {
                if (x11libs[i].lib) {
                    SDL_UnloadObject(x11libs[i].lib);
                    x11libs[i].lib = NULL;
                }
            }
#endif
        }
    }
}

// returns non-zero if all needed symbols were loaded.
bool SDL_X11_LoadSymbols(void)
{
    bool result = true; // always succeed if not using Dynamic X11 stuff.

    // deal with multiple modules (dga, x11, etc) needing these symbols...
    if (x11_load_refcount++ == 0) {
#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
        int i;
        int *thismod = NULL;
        for (i = 0; i < SDL_arraysize(x11libs); i++) {
            if (x11libs[i].libname) {
                x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
            }
        }

#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; // default yes
#include "SDL_x11sym.h"

#define SDL_X11_MODULE(modname)     thismod = &SDL_X11_HAVE_##modname;
#define SDL_X11_SYM(rc, fn, params) X11_##fn = (SDL_DYNX11FN_##fn)X11_GetSym(#fn, thismod);
#include "SDL_x11sym.h"

#ifdef X_HAVE_UTF8_STRING
        X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
            X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
        X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
            X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
        X11_XSetICValues = (SDL_DYNX11FN_XSetICValues)
            X11_GetSym("XSetICValues", &SDL_X11_HAVE_UTF8);
        X11_XVaCreateNestedList = (SDL_DYNX11FN_XVaCreateNestedList)
            X11_GetSym("XVaCreateNestedList", &SDL_X11_HAVE_UTF8);
#endif

        if (SDL_X11_HAVE_BASEXLIB) {
            // all required symbols loaded.
            SDL_ClearError();
        } else {
            // in case something got loaded...
            SDL_X11_UnloadSymbols();
            result = false;
        }

#else // no dynamic X11

#define SDL_X11_MODULE(modname)     SDL_X11_HAVE_##modname = 1; // default yes
#define SDL_X11_SYM(rc, fn, params) X11_##fn = (SDL_DYNX11FN_##fn)fn;
#include "SDL_x11sym.h"

#ifdef X_HAVE_UTF8_STRING
        X11_XCreateIC = XCreateIC;
        X11_XGetICValues = XGetICValues;
        X11_XSetICValues = XSetICValues;
        X11_XVaCreateNestedList = XVaCreateNestedList;
#endif
#endif
    }

    return result;
}

#endif // SDL_VIDEO_DRIVER_X11
