/* 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.
 *
 * $URL$
 * $Id$
 *
 */

/*
 * This code is based on original Hugo Trilogy source code
 *
 * Copyright (c) 1989-1995 David P. Gray
 *
 */

// parser.c - handles all keyboard/command input

#include "common/system.h"

#include "hugo/hugo.h"
#include "hugo/parser.h"
#include "hugo/file.h"
#include "hugo/schedule.h"
#include "hugo/util.h"

namespace Hugo {

Parser_v1d::Parser_v1d(HugoEngine &vm) : Parser(vm) {
}

Parser_v1d::~Parser_v1d() {
}

// Locate word in list of nouns and return ptr to string in noun list
// If n is NULL, start at beginning of list, else with n
char *Parser_v1d::findNextNoun(char *noun) {
	debugC(1, kDebugParser, "findNextNoun(%s)", noun);

	int currNounIndex = -1;
	if (noun) {                                        // If noun not NULL, find index
		for (currNounIndex = 0; _vm._arrayNouns[currNounIndex]; currNounIndex++) {
			if (noun == _vm._arrayNouns[currNounIndex][0])
				break;
		}
	}
	for (int i = currNounIndex + 1; _vm._arrayNouns[i]; i++) {
		for (int j = 0; strlen(_vm._arrayNouns[i][j]); j++) {
			if (strstr(_line, _vm._arrayNouns[i][j]))
				return _vm._arrayNouns[i][0];
		}
	}
	return 0;
}

// Test whether hero is close to object.  Return TRUE or FALSE
// If no noun specified, check context flag in object before other tests.
// If object not near, return suitable string; may be similar object closer
// If radius is -1, treat radius as infinity
bool Parser_v1d::isNear(char *verb, char *noun, object_t *obj, char *comment) {
	debugC(1, kDebugParser, "isNear(%s, %s, obj, %s)", verb, noun, comment);

	if (!noun && !obj->verbOnlyFl) {                // No noun specified & object not context senesitive
		return false;
	} else if (noun && (noun != _vm._arrayNouns[obj->nounIndex][0])) { // Noun specified & not same as object
		return false;
	} else if (obj->carriedFl) {                    // Object is being carried
		return true;
	} else if (obj->screenIndex != *_vm._screen_p) { // Not in same screen
		if (obj->objValue)
			strcpy (comment, _vm._textParser[kCmtAny4]);
		return false;
	}

	if (obj->cycling == INVISIBLE) {
		if (obj->seqNumb) {                         // There is an image
			strcpy(comment, _vm._textParser[kCmtAny5]);
			return false;
		} else {                                    // No image, assume visible
			if ((obj->radius < 0) ||
			   ((abs(obj->x - _vm._hero->x) <= obj->radius) &&
			   (abs(obj->y - _vm._hero->y - _vm._hero->currImagePtr->y2) <= obj->radius))) {
			   return true;
			} else {
				// User is either not close enough (stationary, valueless objects)
				// or is not carrying it (small, portable objects of value)
				if (noun) {                         // Don't say unless object specified
					if (obj->objValue && (verb != _vm._arrayVerbs[_vm._take][0]))
						strcpy(comment, _vm._textParser[kCmtAny4]);
					else
						strcpy(comment, _vm._textParser[kCmtClose]);
					}
				return false;
			}
		}
	}

	if ((obj->radius < 0) ||
	    ((abs(obj->x - _vm._hero->x) <= obj->radius) &&
	    (abs(obj->y + obj->currImagePtr->y2 - _vm._hero->y - _vm._hero->currImagePtr->y2) <= obj->radius))) {
	   return true;
	} else {
		// User is either not close enough (stationary, valueless objects)
		// or is not carrying it (small, portable objects of value)
		if (noun) {                                 // Don't say unless object specified
			if (obj->objValue && (verb != _vm._arrayVerbs[_vm._take][0]))
				strcpy(comment, _vm._textParser[kCmtAny4]);
			else
				strcpy(comment, _vm._textParser[kCmtClose]);
		}
		return false;
	}

	return true;
}

// Test whether supplied verb is one of the common variety for this object
// say_ok needed for special case of take/drop which may be handled not only
// here but also in a cmd_list with a donestr string simultaneously
bool Parser_v1d::isGenericVerb(char *word, object_t *obj) {
	debugC(1, kDebugParser, "isGenericVerb(%s, object_t *obj)", word);

	if (!obj->genericCmd)
		return false;

	// Following is equivalent to switch, but couldn't do one
	if (word == _vm._arrayVerbs[_vm._look][0]) {
		if ((LOOK & obj->genericCmd) == LOOK)
			Utils::Box(BOX_ANY, "%s", _vm._textData[obj->dataIndex]);
		else
			Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBUnusual_1d]);
	} else if (word == _vm._arrayVerbs[_vm._take][0]) {
		if (obj->carriedFl)
			Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBHave]);
		else if ((TAKE & obj->genericCmd) == TAKE)
			takeObject(obj);
		else if (!obj->verbOnlyFl)                  // Make sure not taking object in context!
			Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBNoUse]);
		else
			return false;
	} else if (word == _vm._arrayVerbs[_vm._drop][0]) {
		if (!obj->carriedFl)
			Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBDontHave]);
		else if ((DROP & obj->genericCmd) == DROP)
			dropObject(obj);
		else
			Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBNeed]);
	} else {                                        // It was not a generic cmd
		return false;
	}

	return true;
}

// Test whether supplied verb is included in the list of allowed verbs for
// this object.  If it is, then perform the tests on it from the cmd list
// and if it passes, perform the actions in the action list.  If the verb
// is catered for, return TRUE
bool Parser_v1d::isObjectVerb(char *word, object_t *obj) {
	debugC(1, kDebugParser, "isObjectVerb(%s, object_t *obj)", word);

	// First, find matching verb in cmd list
	uint16 cmdIndex = obj->cmdIndex;                // ptr to list of commands
	if (!cmdIndex)                                  // No commands for this obj
		return false;

	int i;
	for (i = 0; _vm._cmdList[cmdIndex][i].verbIndex != 0; i++) { // For each cmd
		if (!strcmp(word, _vm._arrayVerbs[_vm._cmdList[cmdIndex][i].verbIndex][0])) // Is this verb catered for?
			break;
	}

	if (_vm._cmdList[cmdIndex][i].verbIndex == 0)   // No
		return false;

	// Verb match found, check all required objects are being carried
	cmd *cmnd = &_vm._cmdList[cmdIndex][i];         // ptr to struct cmd
	if (cmnd->reqIndex) {                           // At least 1 thing in list
		uint16 *reqs = _vm._arrayReqs[cmnd->reqIndex]; // ptr to list of required objects
		for (i = 0; reqs[i]; i++) {                 // for each obj
			if (!isCarrying(reqs[i])) {
				Utils::Box(BOX_ANY, "%s", _vm._textData[cmnd->textDataNoCarryIndex]);
				return true;
			}
		}
	}

	// Required objects are present, now check state is correct
	if ((obj->state != cmnd->reqState) && (cmnd->reqState != DONT_CARE)){
		Utils::Box(BOX_ANY, "%s", _vm._textData[cmnd->textDataWrongIndex]);
		return true;
	}

	// Everything checked.  Change the state and carry out any actions
	if (cmnd->reqState != DONT_CARE)                // Don't change new state if required state didn't care
		obj->state = cmnd->newState;
	Utils::Box(BOX_ANY, "%s", _vm._textData[cmnd->textDataDoneIndex]);
	_vm.scheduler().insertActionList(cmnd->actIndex);
	// Special case if verb is Take or Drop.  Assume additional generic actions
	if ((word == _vm._arrayVerbs[_vm._take][0]) || (word == _vm._arrayVerbs[_vm._drop][0]))
		isGenericVerb(word, obj);
	return true;
}

// Print text for possible background object.  Return TRUE if match found
// Only match if both verb and noun found.  Test_ca will match verb-only
bool Parser_v1d::isBackgroundWord(char *noun, char *verb, objectList_t obj) {
	debugC(1, kDebugParser, "isBackgroundWord(%s, %s, object_list_t obj)", noun, verb);

	if (!noun)
		return false;

	for (int i = 0; obj[i].verbIndex; i++) {
		if ((verb == _vm._arrayVerbs[obj[i].verbIndex][0]) && (noun == _vm._arrayNouns[obj[i].nounIndex][0])) {
			Utils::Box(BOX_ANY, "%s", _vm.file().fetchString(obj[i].commentIndex));
			return true;
		}
	}
	return false;
}

// Do all things necessary to carry an object
void Parser_v1d::takeObject(object_t *obj) {
	debugC(1, kDebugParser, "takeObject(object_t *obj)");

	obj->carriedFl = true;
	if (obj->seqNumb)                               // Don't change if no image to display
		obj->cycling = ALMOST_INVISIBLE;

	_vm.adjustScore(obj->objValue);

	Utils::Box(BOX_ANY, TAKE_TEXT, _vm._arrayNouns[obj->nounIndex][TAKE_NAME]);
}

// Do all necessary things to drop an object
void Parser_v1d::dropObject(object_t *obj) {
	debugC(1, kDebugParser, "dropObject(object_t *obj)");

	obj->carriedFl = false;
	obj->screenIndex = *_vm._screen_p;
	if (obj->seqNumb)                               // Don't change if no image to display
		obj->cycling = NOT_CYCLING;
	obj->x = _vm._hero->x - 1;
	obj->y = _vm._hero->y + _vm._hero->currImagePtr->y2 - 1;
	_vm.adjustScore(-obj->objValue);
	Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBOk]);
}

// Print text for possible background object.  Return TRUE if match found
// If test_noun TRUE, must have a noun given
bool Parser_v1d::isCatchallVerb(bool testNounFl, char *noun, char *verb, objectList_t obj) {
	debugC(1, kDebugParser, "isCatchallVerb(%d, %s, %s, object_list_t obj)", (testNounFl) ? 1 : 0, noun, verb);

	if (testNounFl && !noun)
		return false;

	for (int i = 0; obj[i].verbIndex; i++) {
		if ((verb == _vm._arrayVerbs[obj[i].verbIndex][0]) && ((noun == _vm._arrayNouns[obj[i].nounIndex][0]) || (obj[i].nounIndex == 0))) {
			Utils::Box(BOX_ANY, "%s", _vm.file().fetchString(obj[i].commentIndex));
			return true;
		}
	}
	return false;
}

// Parse the user's line of text input.  Generate events as necessary
void Parser_v1d::lineHandler() {
	debugC(1, kDebugParser, "lineHandler()");

	object_t    *obj;
	status_t &gameStatus = _vm.getGameStatus();
	char        farComment[XBYTES * 5] = "";        // hold 5 line comment if object not nearby

//	Reset_prompt_line ();
	Utils::strlwr(_line);                           // Convert to lower case

	if (!strcmp("exit", _line) || strstr(_line, "quit")) {
		if (Utils::Box(BOX_YESNO, "%s", _vm._textParser[kTBExit_1d]) != 0)
			_vm.endGame();
		return;
	}

	// SAVE/RESTORE
	if (!strcmp("save", _line)) {
		if (gameStatus.gameOverFl)
			Utils::gameOverMsg();
		else
//			_vm.file().saveOrRestore(true);
			warning("STUB: saveOrRestore()");
		return;
	}

	if (!strcmp("restore", _line)) {
//		_vm.file().saveOrRestore(false);
		warning("STUB: saveOrRestore()");
		return;
	}

	if (*_line == '\0')                             // Empty line
		return;

	if (strspn(_line, " ") == strlen(_line))        // Nothing but spaces!
		return;

	if (gameStatus.gameOverFl) {                    // No commands allowed!
		Utils::gameOverMsg();
		return;
	}

	// Find the first verb in the line
	char *verb = findVerb();
	char *noun = 0;                                 // Noun not found yet

	if (verb) {                                     // OK, verb found.  Try to match with object
		do {
			noun = findNextNoun(noun);              // Find a noun in the line
			// Must try at least once for objects allowing verb-context
			for (int i = 0; i < _vm._numObj; i++) {
				obj = &_vm._objects[i];
				if (isNear(verb, noun, obj, farComment)) {
					if (isObjectVerb(verb, obj)     // Foreground object
					 || isGenericVerb(verb, obj))   // Common action type
						return;
				}
			}
			if ((*farComment == '\0') && isBackgroundWord(noun, verb, _vm._backgroundObjects[*_vm._screen_p]))
				return;
		} while (noun);
	}
	noun = findNextNoun(noun);
	if (*farComment != '\0')                        // An object matched but not near enough
		Utils::Box(BOX_ANY, "%s", farComment);
	else if (!isCatchallVerb(true, noun, verb, _vm._catchallList) &&
		     !isCatchallVerb(false, noun, verb, _vm._backgroundObjects[*_vm._screen_p])  &&
			 !isCatchallVerb(false, noun, verb, _vm._catchallList))
		Utils::Box(BOX_ANY, "%s", _vm._textParser[kTBEh_1d]);
}

} // End of namespace Hugo