// =====================================================================================================================
//  fennec, a free and open source game engine
//  Copyright © 2025  Medusa Slockbower
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
// =====================================================================================================================

#include <fennec/platform/linux/platform.h>

#include <dlfcn.h>

#ifdef FENNEC_LIB_WAYLAND
#include <fennec/platform/linux/wayland/lib/dyn.h>
#include <fennec/platform/linux/wayland/displaydev.h>
#endif

namespace fennec
{

linux_platform::linux_platform()
	: platform()
	, _display_driver(display_none) {
#if FENNEC_BUILD_SERVER
	_runtime_server_checks();
#else
	_runtime_client_checks();
#endif
}

linux_platform::~linux_platform() {
	if (_display) {
		delete _display;
		_display = nullptr;
	}
}

shared_object* linux_platform::load_object(const cstring& file) {
	void* handle = dlopen(file, RTLD_NOW | RTLD_LOCAL);
	const char* load_error = dlerror();
	assert(handle != nullptr, load_error);
	return static_cast<shared_object*>(handle);
}

void linux_platform::unload_object(shared_object* obj) {
	if (obj) {
		dlclose(obj);
	}
}

platform::function_pointer linux_platform::find_symbol(shared_object* hndl, const cstring& name) {
	string _name = name;
	void* symbol = dlsym(hndl, _name);
	if (symbol == nullptr) {
		_name = '_' + _name;
		symbol = dlsym(hndl, _name);
	}
	return (function_pointer)symbol;
}

platform::global linux_platform::find_global(shared_object* hndl, const cstring& name) {
	string _name = name;
	void* symbol = dlsym(hndl, _name);
	if (symbol == nullptr) {
		_name = '_' + _name;
		symbol = dlsym(hndl, _name);
	}
	return symbol;
}

displaydev* linux_platform::get_display() {
	return _display;
}

void linux_platform::_runtime_client_checks() {
#ifdef FENNEC_LIB_WAYLAND
	if (libwayland::load_symbols(this)) {
		_display_driver = display_wayland;
		_display = new wayland_display(this);
		libwayland::unload_symbols(this); // Doesn't actually unload symbols, just resets ref counter to only consider
		                                  // the created display
	}
#endif
	assertf(_display != nullptr, "failed to find suitable display driver");
}

void linux_platform::_find_display_driver() {

}

void linux_platform::_runtime_server_checks() {

}

}