/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "illusions/illusions.h"
#include "illusions/scriptman.h"

namespace Illusions {

// ActiveScenes

void ActiveScenes::clear() {
	_stack.clear();
}

void ActiveScenes::push(uint32 sceneId) {
	ActiveScene activeScene;
	activeScene._sceneId = sceneId;
	activeScene._pauseCtr = 0;
	_stack.push(activeScene);
}

void ActiveScenes::pop() {
	_stack.pop();
}

void ActiveScenes::pauseActiveScene() {
	++_stack.top()._pauseCtr;
}

void ActiveScenes::unpauseActiveScene() {
	--_stack.top()._pauseCtr;
}

int ActiveScenes::getActiveScenesCount() {
	return _stack.size();
}

void ActiveScenes::getActiveSceneInfo(uint index, uint32 *sceneId, int *pauseCtr) {
	if (sceneId)
		*sceneId = _stack[index]._sceneId;
	if (pauseCtr)
		*pauseCtr = _stack[index]._pauseCtr;
}

uint32 ActiveScenes::getCurrentScene() {
	if (_stack.size() > 0)
		return _stack.top()._sceneId;
	return 0;
}

bool ActiveScenes::isSceneActive(uint32 sceneId) {
	for (uint i = 0; i < _stack.size(); ++i)
		if (_stack[i]._sceneId == sceneId && _stack[i]._pauseCtr <= 0)
			return true;
	return false;
}

// ScriptStack

ScriptStack::ScriptStack() {
	clear();
}

void ScriptStack::clear() {
	for (uint i = 0; i < 256; ++i)
		_stack[i] = (int16)0xEEEE;
	_stackPos = 256;
}

void ScriptStack::push(int16 value) {
	--_stackPos;
	if (_stackPos > 0)
		_stack[_stackPos] = value;
}

int16 ScriptStack::pop() {
	int16 value = 0;
	if (_stackPos < 256) {
		value = _stack[_stackPos];
		_stack[_stackPos] = (int16)0xEEEE;
		++_stackPos;
	}
	return value;
}

int16 ScriptStack::peek() {
	int16 value = 0;
	if (_stackPos < 256)
		value = _stack[_stackPos];
	return value;
}

// ScriptMan

ScriptMan::ScriptMan(IllusionsEngine *vm)
	: _vm(vm) {
}

ScriptMan::~ScriptMan() {
}

void ScriptMan::setSceneIdThreadId(uint32 theSceneId, uint32 theThreadId) {
	_theSceneId = theSceneId;
	_theThreadId = theThreadId;
}

} // End of namespace Illusions