/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file squirrel_std.cpp Implements the Squirrel Standard Function class */

#include "../stdafx.h"
#include <squirrel.h>
#include <sqstdmath.h>
#include "../debug.h"
#include "squirrel_std.hpp"
#include "../core/math_func.hpp"
#include "../string_func.h"

#include "../safeguards.h"


SQInteger SquirrelStd::min(HSQUIRRELVM vm)
{
	SQInteger tmp1, tmp2;

	sq_getinteger(vm, 2, &tmp1);
	sq_getinteger(vm, 3, &tmp2);
	sq_pushinteger(vm, std::min(tmp1, tmp2));
	return 1;
}

SQInteger SquirrelStd::max(HSQUIRRELVM vm)
{
	SQInteger tmp1, tmp2;

	sq_getinteger(vm, 2, &tmp1);
	sq_getinteger(vm, 3, &tmp2);
	sq_pushinteger(vm, std::max(tmp1, tmp2));
	return 1;
}

SQInteger SquirrelStd::require(HSQUIRRELVM vm)
{
	SQInteger top = sq_gettop(vm);
	const SQChar *filename;

	sq_getstring(vm, 2, &filename);

	/* Get the script-name of the current file, so we can work relative from it */
	SQStackInfos si;
	sq_stackinfos(vm, 1, &si);
	if (si.source == nullptr) {
		Debug(misc, 0, "[squirrel] Couldn't detect the script-name of the 'require'-caller; this should never happen!");
		return SQ_ERROR;
	}

	/* Keep the dir, remove the rest */
	std::string path = si.source;
	auto p = path.find_last_of(PATHSEPCHAR);
	/* Keep the PATHSEPCHAR there, remove the rest */
	if (p != std::string::npos) path.erase(p + 1);
	path += filename;
#if (PATHSEPCHAR != '/')
	std::transform(path.begin(), path.end(), path.begin(), [](char &c) { return c == '/' ? PATHSEPCHAR : c; });
#endif

	Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);
	bool ret = engine->LoadScript(vm, path);

	/* Reset the top, so the stack stays correct */
	sq_settop(vm, top);

	return ret ? 0 : SQ_ERROR;
}

SQInteger SquirrelStd::notifyallexceptions(HSQUIRRELVM vm)
{
	SQBool b;

	if (sq_gettop(vm) >= 1) {
		if (SQ_SUCCEEDED(sq_getbool(vm, -1, &b))) {
			sq_notifyallexceptions(vm, b);
			return 0;
		}
	}

	return SQ_ERROR;
}

void squirrel_register_global_std(Squirrel *engine)
{
	/* We don't use squirrel_helper here, as we want to register to the global
	 *  scope and not to a class. */
	engine->AddMethod("require",             &SquirrelStd::require,             2, ".s");
	engine->AddMethod("notifyallexceptions", &SquirrelStd::notifyallexceptions, 2, ".b");
}

void squirrel_register_std(Squirrel *engine)
{
	/* We don't use squirrel_helper here, as we want to register to the global
	 *  scope and not to a class. */
	engine->AddMethod("min", &SquirrelStd::min, 3, ".ii");
	engine->AddMethod("max", &SquirrelStd::max, 3, ".ii");

	sqstd_register_mathlib(engine->GetVM());
}