/* 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 "common/random.h"
#include "common/error.h"

#include "adl/adl_v2.h"
#include "adl/display.h"

namespace Adl {

AdlEngine_v2::~AdlEngine_v2() {
	delete _random;
}

AdlEngine_v2::AdlEngine_v2(OSystem *syst, const AdlGameDescription *gd) :
		AdlEngine(syst, gd),
		_linesPrinted(0) {
	_random = new Common::RandomSource("adl");
}

typedef Common::Functor1Mem<ScriptEnv &, int, AdlEngine_v2> OpcodeV2;
#define SetOpcodeTable(x) table = &x;
#define Opcode(x) table->push_back(new OpcodeV2(this, &AdlEngine_v2::x))
#define OpcodeUnImpl() table->push_back(new OpcodeV2(this, 0))

void AdlEngine_v2::setupOpcodeTables() {
	Common::Array<const Opcode *> *table = 0;

	SetOpcodeTable(_condOpcodes);
	// 0x00
	OpcodeUnImpl();
	Opcode(o2_isFirstTime);
	Opcode(o2_isRandomGT);
	Opcode(o1_isItemInRoom);
	// 0x04
	Opcode(o2_isNounNotInRoom);
	Opcode(o1_isMovesGT);
	Opcode(o1_isVarEQ);
	Opcode(o2_isCarryingSomething);
	// 0x08
	OpcodeUnImpl();
	Opcode(o1_isCurPicEQ);
	Opcode(o1_isItemPicEQ);

	SetOpcodeTable(_actOpcodes);
	// 0x00
	OpcodeUnImpl();
	Opcode(o1_varAdd);
	Opcode(o1_varSub);
	Opcode(o1_varSet);
	// 0x04
	Opcode(o1_listInv);
	Opcode(o2_moveItem);
	Opcode(o1_setRoom);
	Opcode(o1_setCurPic);
	// 0x08
	Opcode(o1_setPic);
	Opcode(o1_printMsg);
	Opcode(o1_setLight);
	Opcode(o1_setDark);
	// 0x0c
	Opcode(o2_moveAllItems);
	Opcode(o1_quit);
	OpcodeUnImpl();
	Opcode(o2_save);
	// 0x10
	Opcode(o2_restore);
	Opcode(o1_restart);
	Opcode(o2_placeItem);
	Opcode(o1_setItemPic);
	// 0x14
	Opcode(o1_resetPic);
	Opcode(o1_goDirection<IDI_DIR_NORTH>);
	Opcode(o1_goDirection<IDI_DIR_SOUTH>);
	Opcode(o1_goDirection<IDI_DIR_EAST>);
	// 0x18
	Opcode(o1_goDirection<IDI_DIR_WEST>);
	Opcode(o1_goDirection<IDI_DIR_UP>);
	Opcode(o1_goDirection<IDI_DIR_DOWN>);
	Opcode(o1_takeItem);
	// 0x1c
	Opcode(o1_dropItem);
	Opcode(o1_setRoomPic);
	Opcode(o2_tellTime);
	Opcode(o2_setRoomFromVar);
	// 0x20
	Opcode(o2_initDisk);
}

bool AdlEngine_v2::matchesCurrentPic(byte pic) const {
	return pic == getCurRoom().curPicture || pic == IDI_ANY;
}

byte AdlEngine_v2::roomArg(byte room) const {
	if (room == IDI_CUR_ROOM)
		return _state.room;
	return room;
}

void AdlEngine_v2::advanceClock() {
	Time &time = _state.time;

	time.minutes += 5;

	if (time.minutes == 60) {
		time.minutes = 0;

		++time.hours;

		if (time.hours == 13)
			time.hours = 1;
	}
}

void AdlEngine_v2::checkTextOverflow(char c) {
	if (c != APPLECHAR('\r'))
		return;

	++_linesPrinted;

	if (_linesPrinted < 4)
		return;

	_linesPrinted = 0;
	_display->updateTextScreen();
	bell();

	while (true) {
		char key = inputKey(false);

		if (shouldQuit())
			return;

		if (key == APPLECHAR('\r'))
			break;

		bell(3);
	}
}

void AdlEngine_v2::printString(const Common::String &str) {
	Common::String s(str);
	byte endPos = TEXT_WIDTH - 1;
	byte pos = 0;

	while (true) {
		while (pos != endPos && pos != s.size()) {
			s.setChar(APPLECHAR(s[pos]), pos);
			++pos;
		}

		if (pos == s.size())
			break;

		while (s[pos] != APPLECHAR(' ') && s[pos] != APPLECHAR('\r'))
			--pos;

		s.setChar(APPLECHAR('\r'), pos);
		endPos = pos + TEXT_WIDTH;
		++pos;
	}

	pos = 0;
	while (pos != s.size()) {
		checkTextOverflow(s[pos]);
		_display->printChar(s[pos]);
		++pos;
	}

	checkTextOverflow(APPLECHAR('\r'));
	_display->printChar(APPLECHAR('\r'));
	_display->updateTextScreen();
}

int AdlEngine_v2::o2_isFirstTime(ScriptEnv &e) {
	bool oldFlag = getCurRoom().isFirstTime;

	getCurRoom().isFirstTime = false;

	if (!oldFlag)
		return -1;

	return 0;
}

int AdlEngine_v2::o2_isRandomGT(ScriptEnv &e) {
	byte rnd = _random->getRandomNumber(255);

	if (rnd > e.arg(1))
		return 1;

	return -1;
}

int AdlEngine_v2::o2_isNounNotInRoom(ScriptEnv &e) {
	Common::Array<Item>::const_iterator item;

	for (item = _state.items.begin(); item != _state.items.end(); ++item)
		if (item->noun == e.getNoun() && (item->room == roomArg(e.arg(1))))
			return -1;

	return 1;
}

int AdlEngine_v2::o2_isCarryingSomething(ScriptEnv &e) {
	Common::Array<Item>::const_iterator item;

	for (item = _state.items.begin(); item != _state.items.end(); ++item)
		if (item->room == IDI_ANY)
			return 0;
	return -1;
}

int AdlEngine_v2::o2_moveItem(ScriptEnv &e) {
	byte room = roomArg(e.arg(2));

	Item &item = getItem(e.arg(1));

	// Set items that move from inventory to a room to state "dropped"
	if (item.room == IDI_ANY && room != IDI_VOID_ROOM)
		item.state = IDI_ITEM_DROPPED;

	item.room = room;
	return 2;
}

int AdlEngine_v2::o2_moveAllItems(ScriptEnv &e) {
	byte room1 = roomArg(e.arg(1));
	byte room2 = roomArg(e.arg(2));

	Common::Array<Item>::iterator item;

	for (item = _state.items.begin(); item != _state.items.end(); ++item)
		if (item->room == room1) {
			item->room = room2;
			if (room1 == IDI_ANY)
				item->state = IDI_ITEM_DROPPED;
		}

	return 2;
}

int AdlEngine_v2::o2_save(ScriptEnv &e) {
	int slot = askForSlot(_strings_v2.saveInsert);

	if (slot < 0)
		return -1;

	saveGameState(slot, "");

	_display->printString(_strings_v2.saveReplace);
	inputString();
	return 0;
}

int AdlEngine_v2::o2_restore(ScriptEnv &e) {
	int slot = askForSlot(_strings_v2.restoreInsert);

	if (slot < 0)
		return -1;

	loadGameState(slot);
	_isRestoring = false;

	_display->printString(_strings_v2.restoreReplace);
	inputString();
	return 0;
}

int AdlEngine_v2::o2_placeItem(ScriptEnv &e) {
	Item &item = getItem(e.arg(1));

	item.room = roomArg(e.arg(2));
	item.position.x = e.arg(3);
	item.position.y = e.arg(4);
	item.state = IDI_ITEM_NOT_MOVED;

	return 4;
}

int AdlEngine_v2::o2_tellTime(ScriptEnv &e) {
	Common::String time = _strings_v2.time;

	time.setChar(APPLECHAR('0') + _state.time.hours / 10, 12);
	time.setChar(APPLECHAR('0') + _state.time.hours % 10, 13);
	time.setChar(APPLECHAR('0') + _state.time.minutes / 10, 15);
	time.setChar(APPLECHAR('0') + _state.time.minutes % 10, 16);

	printString(time);

	return 0;
}

int AdlEngine_v2::o2_setRoomFromVar(ScriptEnv &e) {
	getCurRoom().curPicture = getCurRoom().picture;
	_state.room = getVar(e.arg(1));
	return 1;
}

int AdlEngine_v2::o2_initDisk(ScriptEnv &e) {
	printString("NOT REQUIRED");
	return 0;
}

int AdlEngine_v2::askForSlot(const Common::String &question) {
	while (1) {
		_display->printString(question);

		Common::String input = inputString();

		if (shouldQuit())
			return -1;

		if (input.size() > 0 && input[0] >= APPLECHAR('A') && input[0] <= APPLECHAR('O'))
			return input[0] - APPLECHAR('A');
	}
}

} // End of namespace Adl