combat.cpp

/* 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.
 *
 * MIT License:
 *
 * Copyright (c) 2009 Alexei Svitkine, Eugene Sandulenko
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include "wage/wage.h"
#include "wage/entities.h"
#include "wage/randomhat.h"
#include "wage/world.h"

namespace Wage {

Obj *WageEngine::getOffer() {
	if (_offer != NULL) {
		Chr *owner = _offer->_currentOwner;
		if (owner == NULL || owner->_playerCharacter || owner->_currentScene != _world->_player->_currentScene) {
			_offer = NULL;
		}
	}
	return _offer;
}

Chr *WageEngine::getMonster() {
	if (_monster != NULL && _monster->_currentScene != _world->_player->_currentScene) {
		_monster = NULL;
	}
	return _monster;
}

void WageEngine::encounter(Chr *player, Chr *chr) {
	char buf[512];

	snprintf(buf, 512, "You encounter %s%s.", chr->_nameProperNoun ? "" : getIndefiniteArticle(chr->_name),
				chr->_name.c_str());
	appendText(buf);

	if (!chr->_initialComment.empty())
		appendText(chr->_initialComment.c_str());

	if (chr->_armor[Chr::HEAD_ARMOR] != NULL) {
		snprintf(buf, 512, "%s%s is wearing %s.", chr->getDefiniteArticle(true), chr->_name.c_str(),
					getIndefiniteArticle(chr->_armor[Chr::HEAD_ARMOR]->_name));
		appendText(buf);
	}
	if (chr->_armor[Chr::BODY_ARMOR] != NULL) {
		snprintf(buf, 512, "%s is protected by %s%s.", getGenderSpecificPronoun(chr->_gender, true),
					prependGenderSpecificPronoun(chr->_gender), chr->_armor[Chr::BODY_ARMOR]->_name.c_str());
		appendText(buf);
	}
	if (chr->_armor[Chr::SHIELD_ARMOR] != NULL) {
		Obj *obj = chr->_armor[Chr::SHIELD_ARMOR];

		snprintf(buf, 512, "%s carries %s%s.", getGenderSpecificPronoun(chr->_gender, true),
				obj->_namePlural ? "" : getIndefiniteArticle(obj->_name), obj->_name.c_str());
		appendText(buf);
	}
}

void WageEngine::performCombatAction(Chr *npc, Chr *player) {
	if (npc->_context._frozen)
		return;

	RandomHat hat(_rnd);

	bool winning = (npc->_context._statVariables[PHYS_HIT_CUR] > player->_context._statVariables[PHYS_HIT_CUR]);
	int validMoves = getValidMoveDirections(npc);
	ObjArray *weapons = npc->getWeapons(false);
	ObjArray *magics = npc->getMagicalObjects();
	// TODO: Figure out under what circumstances we need to add +1
	// for the chance (e.g. only when all values were set to 0?).
	if (winning) {
		if (!_world->_weaponMenuDisabled) {
			if (weapons->size() > 0)
				hat.addTokens(kTokWeapons, npc->_winningWeapons + 1);
			if (magics->size() > 0)
				hat.addTokens(kTokMagic, npc->_winningMagic);
		}
		if (validMoves != 0)
			hat.addTokens(kTokRun, npc->_winningRun + 1);
		if (npc->_inventory.size())
			hat.addTokens(kTokOffer, npc->_winningOffer + 1);
	} else {
		if (!_world->_weaponMenuDisabled) {
			if (weapons->size() > 0)
				hat.addTokens(kTokWeapons, npc->_losingWeapons + 1);
			if (magics->size() > 0)
				hat.addTokens(kTokMagic, npc->_losingMagic);
		}
		if (validMoves != 0)
			hat.addTokens(kTokRun, npc->_losingRun + 1);
		if (npc->_inventory.size())
			hat.addTokens(kTokOffer, npc->_losingOffer + 1);
	}

	ObjList *objs = &npc->_currentScene->_objs;
	if (npc->_inventory.size() < npc->_maximumCarriedObjects) {
		int cnt = 0;
		for (ObjList::const_iterator it = objs->begin(); it != objs->end(); ++it, ++cnt) {
			if ((*it)->_type != Obj::IMMOBILE_OBJECT) {
				// TODO: I'm not sure what the chance should be here.
				hat.addTokens(cnt, 123);
			}
		}
	}

	int token = hat.drawToken();
	switch (token) {
		case kTokWeapons:
			// TODO: I think the monster should choose the "best" weapon.
			performAttack(npc, player, weapons->operator[](_rnd->getRandomNumber(weapons->size() - 1)));
			break;
		case kTokMagic:
			// TODO: I think the monster should choose the "best" magic.
			performMagic(npc, player, magics->operator[](_rnd->getRandomNumber(magics->size() - 1)));
			break;
		case kTokRun:
			performMove(npc, validMoves);
			break;
		case kTokOffer:
			performOffer(npc, player);
			break;
		case kTokNone:
			break;
		default:
			{
				int cnt = 0;
				for (ObjList::const_iterator it = objs->begin(); it != objs->end(); ++it, ++cnt)
					if (cnt == token)
						performTake(npc, *it);
				break;
			}
	}

	delete weapons;
	delete magics;
}

const char *targets[] = { "head", "chest", "side" };

void WageEngine::performAttack(Chr *attacker, Chr *victim, Obj *weapon) {
	if (_world->_weaponMenuDisabled)
		return;

	// TODO: verify that a player not aiming will always target the chest??
	int targetIndex = -1;
	char buf[256];

	if (weapon->_type != Obj::MAGICAL_OBJECT) {
		if (attacker->_playerCharacter) {
			targetIndex = _aim;
		} else {
			targetIndex = _rnd->getRandomNumber(ARRAYSIZE(targets) - 1);
			_opponentAim = targetIndex + 1;
		}

		if (!attacker->_playerCharacter) {
			snprintf(buf, 256, "%s%s %ss %s%s at %s%s's %s.",
				attacker->getDefiniteArticle(true), attacker->_name.c_str(),
				weapon->_operativeVerb.c_str(),
				prependGenderSpecificPronoun(attacker->_gender), weapon->_name.c_str(),
				victim->getDefiniteArticle(true), victim->_name.c_str(),
				targets[targetIndex]);
			appendText(buf);
		}
	} else if (!attacker->_playerCharacter) {
		snprintf(buf, 256, "%s%s %ss %s%s at %s%s.",
			attacker->getDefiniteArticle(true), attacker->_name.c_str(),
			weapon->_operativeVerb.c_str(),
			prependGenderSpecificPronoun(attacker->_gender), weapon->_name.c_str(),
			victim->getDefiniteArticle(true), victim->_name.c_str());
		appendText(buf);
	}

	playSound(weapon->_sound);

	bool usesDecremented = false;
	int chance = _rnd->getRandomNumber(255);
	// TODO: what about obj accuracy
	if (chance < attacker->_physicalAccuracy) {
		usesDecremented = attackHit(attacker, victim, weapon, targetIndex);
	} else if (weapon->_type != Obj::MAGICAL_OBJECT) {
		appendText((char *)"A miss!");
	} else if (attacker->_playerCharacter) {
		appendText((char *)"The spell has no effect.");
	}

	if (!usesDecremented) {
		decrementUses(weapon);
	}
}

void WageEngine::decrementUses(Obj *obj) {
	warning("STUB: decrementUses()");
}

bool WageEngine::attackHit(Chr *attacker, Chr *victim, Obj *weapon, int targetIndex) {
	warning("STUB: attackHit");

	return false;
}

void WageEngine::performMagic(Chr *attacker, Chr *victim, Obj *magicalObject) {
	switch (magicalObject->_attackType) {
	case Obj::HEALS_PHYSICAL_DAMAGE:
	case Obj::HEALS_SPIRITUAL_DAMAGE:
	case Obj::HEALS_PHYSICAL_AND_SPIRITUAL_DAMAGE:
		performHealingMagic(attacker, magicalObject);
		return;
	}

	performAttack(attacker, victim, magicalObject);
}

void WageEngine::performHealingMagic(Chr *chr, Obj *magicalObject) {
	warning("STUB: performHealingMagic()");
}

static const int directionsX[] = { 0, 0, 1, -1 };
static const int directionsY[] = { -1, 1, 0, 0 };
static const char *directionsS[] = { "north", "south", "east", "west" };

void WageEngine::performMove(Chr *chr, int validMoves) {
	// count how many valid moves we have
	int numValidMoves = 0;

	for (int dir = 0; dir < 4; dir++)
		if ((validMoves & (1 << dir)) != 0)
			numValidMoves++;

	// Now pick random dir
	int dir = _rnd->getRandomNumber(numValidMoves);

	// And get it

	for (int i = 0; i < 4; i++, dir--)
		if ((validMoves & (1 << i)) != 0) {
			if (dir == 0) {
				dir = i;
				break;
			}
		}

	char buf[256];
	snprintf(buf, 256, "%s%s runs %s.", chr->getDefiniteArticle(true), chr->_name.c_str(), directionsS[dir]);
	appendText(buf);

	_running = chr;
	Scene *currentScene = chr->_currentScene;
	int destX = currentScene->_worldX + directionsX[dir];
	int destY = currentScene->_worldY + directionsY[dir];

	_world->move(chr, _world->getSceneAt(destX, destY));
}

void WageEngine::performOffer(Chr *attacker, Chr *victim) {
	/* TODO: choose in a smarter way? */
	Obj *obj = attacker->_inventory[0];
	char buf[512];

	snprintf(buf, 512, "%s%s offers %s%s.", attacker->getDefiniteArticle(true), attacker->_name.c_str(),
			obj->_namePlural ? "some " : getIndefiniteArticle(obj->_name), obj->_name.c_str());

	appendText(buf);

	_offer = obj;
}

void WageEngine::performTake(Chr *npc, Obj *obj) {
	char buf[512];

	snprintf(buf, 512, "%s%s picks up the %s%s.", npc->getDefiniteArticle(true), npc->_name.c_str(),
			getIndefiniteArticle(obj->_name), obj->_name.c_str());

	appendText(buf);

	_world->move(obj, npc);
}

int WageEngine::getValidMoveDirections(Chr *npc) {
	int directions = 0;
	Scene *currentScene = npc->_currentScene;
	for (int dir = 0; dir < 4; dir++) {
		if (!currentScene->_blocked[dir]) {
			int destX = currentScene->_worldX + directionsX[dir];
			int destY = currentScene->_worldY + directionsY[dir];

			Scene *scene = _world->getSceneAt(destX, destY);

			if (scene != NULL && scene->_chrs.size() == 0) {
				directions |= (1 << dir);
			}
		}
	}

	return directions;
}

void WageEngine::regen() {
	Chr *player = _world->_player;
	int curHp = player->_context._statVariables[PHYS_HIT_CUR];
	int maxHp = player->_context._statVariables[PHYS_HIT_BAS];
	int delta = maxHp - curHp;

	if (delta > 0) {
		int bonus = (int)(delta / (8 + _rnd->getRandomNumber(2)));
		player->_context._statVariables[PHYS_HIT_CUR] += bonus;
	}
}

void WageEngine::takeObj(Obj *obj) {
  if ((int)_world->_player->_inventory.size() >= _world->_player->_maximumCarriedObjects) {
		appendText("Your pack is full, you must drop something.");
	} else {
		char buf[256];

		_world->move(obj, _world->_player);
		int type = _world->_player->wearObjIfPossible(obj);
		if (type == Chr::HEAD_ARMOR) {
			snprintf(buf, 256, "You are now wearing the %s.", obj->_name.c_str());
			appendText(buf);
		} else if (type == Chr::BODY_ARMOR) {
			snprintf(buf, 256, "You are now wearing the %s.", obj->_name.c_str());
			appendText(buf);
		} else if (type == Chr::SHIELD_ARMOR) {
			snprintf(buf, 256, "You are now wearing the %s.", obj->_name.c_str());
			appendText(buf);
		} else if (type == Chr::MAGIC_ARMOR) {
			snprintf(buf, 256, "You are now wearing the %s.", obj->_name.c_str());
			appendText(buf);
		} else {
			snprintf(buf, 256, "You now have the %s.", obj->_name.c_str());
			appendText(buf);
		}
		appendText(obj->_clickMessage.c_str());
	}
}

bool WageEngine::handleMoveCommand(Directions dir, const char *dirName) {
	Scene *playerScene = _world->_player->_currentScene;
	const char *msg = playerScene->_messages[dir].c_str();

	warning("Dir: %s  msg: %s", dirName, msg);

	if (!playerScene->_blocked[dir]) {
		int destX = playerScene->_worldX + directionsX[dir];
		int destY = playerScene->_worldY + directionsY[dir];

		Scene *scene = _world->getSceneAt(destX, destY);

		if (scene != NULL) {
			if (strlen(msg) > 0) {
				appendText(msg);
			}
			_world->move(_world->_player, scene);
			return true;
		}
	}
	if (strlen(msg) > 0) {
		appendText(msg);
	} else {
		Common::String txt("You can't go ");
		txt += dirName;
		txt += ".";
		appendText(txt.c_str());
	}

	return true;
}

bool WageEngine::handleLookCommand() {
	appendText(_world->_player->_currentScene->_text.c_str());

	Common::String *items = getGroundItemsList(_world->_player->_currentScene);
	if (items != NULL) {
		appendText(items->c_str());

		delete items;
	}

	return true;
}

Common::String *WageEngine::getGroundItemsList(Scene *scene) {
	ObjArray objs;

	for (ObjList::const_iterator it = scene->_objs.begin(); it != scene->_objs.end(); ++it)
		if ((*it)->_type != Obj::IMMOBILE_OBJECT)
			objs.push_back(*it);

	if (objs.size()) {
		Common::String *res = new Common::String("On the ground you see ");
		appendObjNames(*res, objs);
		return res;
	}
	return NULL;
}

void WageEngine::appendObjNames(Common::String &str, ObjArray &objs) {
	for (uint i = 0; i < objs.size(); i++) {
		Obj *obj = objs[i];

		if (!obj->_namePlural)
			str += getIndefiniteArticle(obj->_name);
		else
			str += "some ";

		str += obj->_name;

		if (i == objs.size() - 1) {
			str += ".";
		} else if (i == objs.size() - 2) {
			if (objs.size() > 2)
				str += ",";
			str += " and ";
		} else {
			str += ", ";
		}
	}
}

bool WageEngine::handleInventoryCommand() {
	Chr *player = _world->_player;
	ObjArray objs;

	for (ObjArray::const_iterator it = player->_inventory.begin(); it != player->_inventory.end(); ++it)
		if (!player->isWearing(*it))
			objs.push_back(*it);

	if (!objs.size()) {
		appendText((char *)"Your pack is empty.");
	} else {
		Common::String res("Your pack contains ");
		appendObjNames(res, objs);
		appendText(res.c_str());
	}

	return true;
}

static const char *armorMessages[] = {
	"Head protection:",
	"Chest protection:",
	"Shield protection:", // TODO: check message
	"Magical protection:"
};

bool WageEngine::handleStatusCommand() {
	Chr *player = _world->_player;
	char buf[512];

	snprintf(buf, 512, "Character name: %s%s", player->getDefiniteArticle(false), player->_name.c_str());
	appendText(buf);
	snprintf(buf, 512, "Experience: %d", player->_context._experience);
	appendText(buf);

	int wealth = 0;
	for (ObjArray::const_iterator it = player->_inventory.begin(); it != player->_inventory.end(); ++it)
		wealth += (*it)->_value;

	snprintf(buf, 512, "Wealth: %d", wealth);
	appendText(buf);

	for (int i = 0; i < Chr::NUMBER_OF_ARMOR_TYPES; i++) {
		if (player->_armor[i] != NULL) {
			snprintf(buf, 512, "%s %s", armorMessages[i], player->_armor[i]->_name.c_str());
			appendText(buf);
		}
	}

	for (ObjArray::const_iterator it = player->_inventory.begin(); it != player->_inventory.end(); ++it) {
		int uses = (*it)->_numberOfUses;

		if (uses > 0) {
			snprintf(buf, 512, "Your %s has %d uses left.", (*it)->_name.c_str(), uses);
			appendText(buf);
		}
	}

	printPlayerCondition(player);

	_commandWasQuick = true;

	return true;
}

bool WageEngine::handleRestCommand() {
	if (getMonster() != NULL) {
		appendText((char *)"This is no time to rest!");
		_commandWasQuick = true;
	} else {
		regen();
		printPlayerCondition(_world->_player);
	}

	return true;
}

bool WageEngine::handleAcceptCommand() {
	Chr *chr = _offer->_currentOwner;

	char buf[512];
	snprintf(buf, 512, "%s%s lays the %s on the ground and departs peacefully.",
		chr->getDefiniteArticle(true), chr->_name.c_str(), _offer->_name.c_str());
	appendText(buf);

	_world->move(_offer, chr->_currentScene);
	_world->move(chr, _world->_storageScene);

	return true;
}

bool WageEngine::handleTakeCommand(const char *target) {
	Common::String t(target);
	bool handled = false;

	for (ObjList::const_iterator it = _world->_player->_currentScene->_objs.begin(); it != _world->_player->_currentScene->_objs.end(); ++it) {
		Common::String n((*it)->_name);
		n.toLowercase();

		if (t.contains(n)) {
			if ((*it)->_type == Obj::IMMOBILE_OBJECT) {
				appendText((char *)"You can't move it.");
			} else {
				takeObj(*it);
			}

			handled = true;
			break;
		}
	}

	return handled;
}

bool WageEngine::handleDropCommand(const char *target) {
	Common::String t(target);
	bool handled = false;

	t.toLowercase();

	for (ObjArray::const_iterator it = _world->_player->_inventory.begin(); it != _world->_player->_inventory.end(); ++it) {
		Common::String n((*it)->_name);
		n.toLowercase();

		if (t.contains(n)) {
			char buf[256];

			snprintf(buf, 256, "You no longer have the %s.", (*it)->_name.c_str());
			appendText(buf);
			_world->move(*it, _world->_player->_currentScene);

			handled = true;
			break;
		}
	}

	return handled;
}

bool WageEngine::handleAimCommand(const char *t) {
	bool wasHandled = true;
	Common::String target(t);

	target.toLowercase();

	if (target.contains("head")) {
		_aim = Chr::HEAD;
	} else if (target.contains("chest")) {
		_aim = Chr::CHEST;
	} else if (target.contains("side")) {
		_aim = Chr::SIDE;
	} else {
		wasHandled = false;
		appendText((char *)"Please aim for the head, chest, or side.");
	}

	_commandWasQuick = true;

	return wasHandled;
}

bool WageEngine::handleWearCommand(const char *t) {
	Chr *player = _world->_player;
	char buf[512];
	Common::String target(t);
	bool handled = false;

	target.toLowercase();

	for (ObjArray::const_iterator it = _world->_player->_inventory.begin(); it != _world->_player->_inventory.end(); ++it) {
		Common::String n((*it)->_name);

		if (target.contains(n)) {
			if ((*it)->_type == Obj::HELMET) {
				wearObj(*it, Chr::HEAD_ARMOR);
			} else if ((*it)->_type == Obj::CHEST_ARMOR) {
				wearObj(*it, Chr::BODY_ARMOR);
			} else if ((*it)->_type == Obj::SHIELD) {
				wearObj(*it, Chr::SHIELD_ARMOR);
			} else if ((*it)->_type == Obj::SPIRITUAL_ARMOR) {
				wearObj(*it, Chr::MAGIC_ARMOR);
			} else {
				appendText((char *)"You cannot wear that object.");
			}

			handled = true;
			break;
		}
	}

	for (ObjList::const_iterator it = player->_currentScene->_objs.begin(); it != player->_currentScene->_objs.end(); ++it) {
		Common::String n((*it)->_name);
		n.toLowercase();
		if (target.contains(n)) {
			snprintf(buf, 512, "First you must get the %s.", (*it)->_name.c_str());
			appendText(buf);

			handled = true;
			break;
		}
	}

	return handled;
}

void WageEngine::wearObj(Obj *o, int pos) {
	Chr *player = _world->_player;
	char buf[512];

	if (player->_armor[pos] == o) {
		snprintf(buf, 512, "You are already wearing the %s.", o->_name.c_str());
		appendText(buf);
	} else {
		if (player->_armor[pos] != NULL) {
			snprintf(buf, 512, "You are no longer wearing the %s.", player->_armor[pos]->_name.c_str());
			appendText(buf);
		}

		player->_armor[pos] = o;
		snprintf(buf, 512, "You are now wearing the %s.", o->_name.c_str());
		appendText(buf);
	}
}


bool WageEngine::handleOfferCommand(const char *target) {
	warning("STUB: handleOfferCommand");

	return false;
}

bool WageEngine::tryAttack(Obj *weapon, Common::String &input) {
	warning("STUB: tryAttack");

	return false;
}

bool WageEngine::handleAttack(Obj *weapon) {
	warning("STUB: handleAttack");

	return true;
}

const char *WageEngine::getPercentMessage(double percent) {
	if (percent < 0.40) {
		return "very bad";
	} else if (percent < 0.55) {
		return "bad";
	} else if (percent < 0.70) {
		return "average";
	} else if (percent < 0.85) {
		return "good";
	} else if (percent <= 1.00) {
		return "very good";
	} else {
		return "enhanced";
	}
}

void WageEngine::printPlayerCondition(Chr *player) {
	double physicalPercent = (double)player->_context._statVariables[PHYS_HIT_CUR] / player->_context._statVariables[PHYS_HIT_BAS];
	double spiritualPercent = (double)player->_context._statVariables[SPIR_HIT_CUR] / player->_context._statVariables[SPIR_HIT_BAS];
	char buf[256];

	snprintf(buf, 256, "Your physical condition is %s.", getPercentMessage(physicalPercent));
	appendText(buf);

	snprintf(buf, 256, "Your spiritual condition is %s.", getPercentMessage(spiritualPercent));
	appendText(buf);
}

} // End of namespace Wage