/* 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.
 *
 */

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

#include "common/events.h"
#include "common/textconsole.h"
#include "gui/debugger.h"

#include "hugo/hugo.h"
#include "hugo/display.h"
#include "hugo/parser.h"
#include "hugo/file.h"
#include "hugo/util.h"
#include "hugo/route.h"
#include "hugo/sound.h"
#include "hugo/object.h"
#include "hugo/text.h"
#include "hugo/inventory.h"

namespace Hugo {

Parser::Parser(HugoEngine *vm) : _vm(vm), _putIndex(0), _getIndex(0) {
	_catchallList = nullptr;
	_arrayReqs = nullptr;

	_backgroundObjects = nullptr;
	_backgroundObjectsSize = 0;
	_cmdList = nullptr;
	_cmdListSize = 0;

	_cmdLineIndex = 0;
	_cmdLineTick = 0;
	_cmdLineCursor = '_';
	_cmdLine[0] = '\0';
	_checkDoubleF1Fl = false;
}

Parser::~Parser() {
}

uint16 Parser::getCmdDefaultVerbIdx(const uint16 index) const {
	return _cmdList[index][0]._verbIndex;
}

/**
 * Read a cmd structure from Hugo.dat
 */
void Parser::readCmd(Common::ReadStream &in, cmd &curCmd) {
	curCmd._verbIndex = in.readUint16BE();
	curCmd._reqIndex = in.readUint16BE();
	curCmd._textDataNoCarryIndex = in.readUint16BE();
	curCmd._reqState = in.readByte();
	curCmd._newState = in.readByte();
	curCmd._textDataWrongIndex = in.readUint16BE();
	curCmd._textDataDoneIndex = in.readUint16BE();
	curCmd._actIndex = in.readUint16BE();
}

/**
 * Load _cmdList from Hugo.dat
 */
void Parser::loadCmdList(Common::ReadStream &in) {
	cmd tmpCmd;
	memset(&tmpCmd, 0, sizeof(tmpCmd));
	for (int varnt = 0; varnt < _vm->_numVariant; varnt++) {
		uint16 numElem = in.readUint16BE();
		if (varnt == _vm->_gameVariant) {
			_cmdListSize = numElem;
			_cmdList = (cmd **)malloc(sizeof(cmd *) * _cmdListSize);
		}

		for (int16 i = 0; i < numElem; i++) {
			uint16 numSubElem = in.readUint16BE();
			if (varnt == _vm->_gameVariant)
				_cmdList[i] = (cmd *)malloc(sizeof(cmd) * numSubElem);
			for (int16 j = 0; j < numSubElem; j++)
				readCmd(in, (varnt == _vm->_gameVariant) ? _cmdList[i][j] : tmpCmd);
		}
	}
}


void Parser::readBG(Common::ReadStream &in, Background &curBG) {
	curBG._verbIndex = in.readUint16BE();
	curBG._nounIndex = in.readUint16BE();
	curBG._commentIndex = in.readSint16BE();
	curBG._matchFl = (in.readByte() != 0);
	curBG._roomState = in.readByte();
	curBG._bonusIndex = in.readByte();
}

/**
 * Read _backgrounObjects from Hugo.dat
 */
void Parser::loadBackgroundObjects(Common::ReadStream &in) {
	Background tmpBG;
	memset(&tmpBG, 0, sizeof(tmpBG));

	for (int varnt = 0; varnt < _vm->_numVariant; varnt++) {
		uint16 numElem = in.readUint16BE();

		if (varnt == _vm->_gameVariant) {
			_backgroundObjectsSize = numElem;
			_backgroundObjects = (Background **)malloc(sizeof(Background *) * numElem);
		}

		for (int i = 0; i < numElem; i++) {
			uint16 numSubElem = in.readUint16BE();
			if (varnt == _vm->_gameVariant)
				_backgroundObjects[i] = (Background *)malloc(sizeof(Background) * numSubElem);

			for (int j = 0; j < numSubElem; j++)
				readBG(in, (varnt == _vm->_gameVariant) ? _backgroundObjects[i][j] : tmpBG);
		}
	}
}

/**
 * Read _catchallList from Hugo.dat
 */
void Parser::loadCatchallList(Common::ReadStream &in) {
	Background *wrkCatchallList = 0;
	Background tmpBG;
	memset(&tmpBG, 0, sizeof(tmpBG));

	for (int varnt = 0; varnt < _vm->_numVariant; varnt++) {
		uint16 numElem = in.readUint16BE();

		if (varnt == _vm->_gameVariant)
			_catchallList = wrkCatchallList = (Background *)malloc(sizeof(Background) * numElem);

		for (int i = 0; i < numElem; i++)
			readBG(in, (varnt == _vm->_gameVariant) ? wrkCatchallList[i] : tmpBG);
	}
}

void Parser::loadArrayReqs(Common::SeekableReadStream &in) {
	_arrayReqs = _vm->loadLongArray(in);
}

/**
 * Search background command list for this screen for supplied object.
 * Return first associated verb (not "look") or 0 if none found.
 */
const char *Parser::useBG(const char *name) {
	debugC(1, kDebugEngine, "useBG(%s)", name);

	ObjectList p = _backgroundObjects[*_vm->_screenPtr];
	for (int i = 0; p[i]._verbIndex != 0; i++) {
		if ((name == _vm->_text->getNoun(p[i]._nounIndex, 0) &&
		     p[i]._verbIndex != _vm->_look) &&
		    ((p[i]._roomState == kStateDontCare) || (p[i]._roomState == _vm->_screenStates[*_vm->_screenPtr])))
			return _vm->_text->getVerb(p[i]._verbIndex, 0);
	}

	return nullptr;
}

void Parser::freeParser() {
	if (_arrayReqs) {
		for (int i = 0; _arrayReqs[i] != 0; i++)
			free(_arrayReqs[i]);
		free(_arrayReqs);
		_arrayReqs = nullptr;
	}

	free(_catchallList);
	_catchallList = nullptr;

	if (_backgroundObjects) {
		for (int i = 0; i < _backgroundObjectsSize; i++)
			free(_backgroundObjects[i]);
		free(_backgroundObjects);
		_backgroundObjects = nullptr;
	}

	if (_cmdList) {
		for (int i = 0; i < _cmdListSize; i++)
			free(_cmdList[i]);
		free(_cmdList);
		_cmdList = nullptr;
	}
}

void Parser::switchTurbo() {
	_vm->_config._turboFl = !_vm->_config._turboFl;
}

/**
 * Add any new chars to line buffer and display them.
 * If CR pressed, pass line to LineHandler()
 */
void Parser::charHandler() {
	debugC(4, kDebugParser, "charHandler");

	Status &gameStatus = _vm->getGameStatus();

	// Check for one or more characters in ring buffer
	while (_getIndex != _putIndex) {
		char c = _ringBuffer[_getIndex++];
		if (_getIndex >= sizeof(_ringBuffer))
			_getIndex = 0;

		switch (c) {
		case Common::KEYCODE_BACKSPACE:             // Rubout key
			if (_cmdLineIndex)
				_cmdLine[--_cmdLineIndex] = '\0';
			break;
		case Common::KEYCODE_RETURN:                // EOL, pass line to line handler
			if (_cmdLineIndex && (_vm->_hero->_pathType != kPathQuiet)) {
				// Remove inventory bar if active
				if (_vm->_inventory->getInventoryState() == kInventoryActive)
					_vm->_inventory->setInventoryState(kInventoryUp);
				// Call Line handler and reset line
				command(_cmdLine);
				_cmdLine[_cmdLineIndex = 0] = '\0';
			}
			break;
		default:                                    // Normal text key, add to line
			if (_cmdLineIndex >= kMaxLineSize) {
				//MessageBeep(MB_ICONASTERISK);
				warning("STUB: MessageBeep() - Command line too long");
			} else if (Common::isPrint(c)) {
				_cmdLine[_cmdLineIndex++] = c;
				_cmdLine[_cmdLineIndex] = '\0';
			}
			break;
		}
	}

	// See if time to blink cursor, set cursor character
	if ((_cmdLineTick++ % (_vm->getTPS() / kBlinksPerSec)) == 0)
		_cmdLineCursor = (_cmdLineCursor == '_') ? ' ' : '_';

	// See if recall button pressed
	if (gameStatus._recallFl) {
		// Copy previous line to current cmdline
		gameStatus._recallFl = false;
		strcpy(_cmdLine, _vm->_line);
		_cmdLineIndex = strlen(_cmdLine);
	}

	sprintf(_vm->_statusLine, ">%s%c", _cmdLine, _cmdLineCursor);
	sprintf(_vm->_scoreLine, "F1-Help  %s  Score: %d of %d Sound %s", (_vm->_config._turboFl) ? "T" : " ", _vm->getScore(), _vm->getMaxScore(), (_vm->_config._soundFl) ? "On" : "Off");

	// See if "look" button pressed
	if (gameStatus._lookFl) {
		command("look around");
		gameStatus._lookFl = false;
	}
}

void Parser::keyHandler(Common::Event event) {
	debugC(1, kDebugParser, "keyHandler(%d)", event.kbd.keycode);

	Status &gameStatus = _vm->getGameStatus();
	uint16 nChar = event.kbd.keycode;

	if (event.kbd.flags & (Common::KBD_ALT | Common::KBD_SCRL))
		return;

	if (event.kbd.hasFlags(Common::KBD_CTRL)) {
		switch (nChar) {
		case Common::KEYCODE_d:
			_vm->getDebugger()->attach();
			_vm->getDebugger()->onFrame();
			break;
		case Common::KEYCODE_l:
			_vm->_file->restoreGame(-1);
			break;
		case Common::KEYCODE_n:
			if (Utils::yesNoBox("Are you sure you want to start a new game?"))
				_vm->_file->restoreGame(0);
			break;
		case Common::KEYCODE_s:
			if (gameStatus._viewState == kViewPlay) {
				if (gameStatus._gameOverFl)
					_vm->gameOverMsg();
				else
					_vm->_file->saveGame(-1, Common::String());
			}
			break;
		default:
			break;
		}
		return;
	}

	// Process key down event - called from OnKeyDown()
	switch (nChar) {                                // Set various toggle states
	case Common::KEYCODE_ESCAPE:                    // Escape key, may want to QUIT
		if (gameStatus._viewState == kViewIntro)
			gameStatus._skipIntroFl = true;
		else {
			if (_vm->_inventory->getInventoryState() == kInventoryActive) // Remove inventory, if displayed
				_vm->_inventory->setInventoryState(kInventoryUp);
			_vm->_screen->resetInventoryObjId();
		}
		break;
	case Common::KEYCODE_END:
	case Common::KEYCODE_HOME:
	case Common::KEYCODE_PAGEUP:
	case Common::KEYCODE_PAGEDOWN:
	case Common::KEYCODE_KP1:
	case Common::KEYCODE_KP7:
	case Common::KEYCODE_KP9:
	case Common::KEYCODE_KP3:
	case Common::KEYCODE_LEFT:
	case Common::KEYCODE_RIGHT:
	case Common::KEYCODE_UP:
	case Common::KEYCODE_DOWN:
	case Common::KEYCODE_KP4:
	case Common::KEYCODE_KP6:
	case Common::KEYCODE_KP8:
	case Common::KEYCODE_KP2:
		_vm->_route->resetRoute();                  // Stop any automatic route
		_vm->_route->setWalk(nChar);                // Direction of hero travel
		break;
	case Common::KEYCODE_F1:                        // User Help (DOS)
		if (_checkDoubleF1Fl)
			gameStatus._helpFl = true;
		else
			_vm->_screen->userHelp();
		_checkDoubleF1Fl = !_checkDoubleF1Fl;
		break;
	case Common::KEYCODE_F2:                        // Toggle sound
		_vm->_sound->toggleSound();
		_vm->_sound->toggleMusic();
		break;
	case Common::KEYCODE_F3:                        // Repeat last line
		gameStatus._recallFl = true;
		break;
	case Common::KEYCODE_F4:                        // Save game
		if (gameStatus._viewState == kViewPlay) {
			if (gameStatus._gameOverFl)
				_vm->gameOverMsg();
			else
				_vm->_file->saveGame(-1, Common::String());
		}
		break;
	case Common::KEYCODE_F5:                        // Restore game
		_vm->_file->restoreGame(-1);
		break;
	case Common::KEYCODE_F6:                        // Inventory
		showInventory();
		break;
	case Common::KEYCODE_F8:                        // Turbo mode
		switchTurbo();
		break;
	default:                                        // Any other key
		if (!gameStatus._storyModeFl) {              // Keyboard disabled
			// Add printable keys to ring buffer
			uint16 bnext = _putIndex + 1;
			if (bnext >= sizeof(_ringBuffer))
				bnext = 0;
			if (bnext != _getIndex) {
				_ringBuffer[_putIndex] = event.kbd.ascii;
				_putIndex = bnext;
			}
		}
		break;
	}
	if (_checkDoubleF1Fl && (nChar != Common::KEYCODE_F1))
		_checkDoubleF1Fl = false;
}

/**
 * Perform an immediate command.  Takes parameters a la sprintf
 * Assumes final string will not overrun line[] length
 */
void Parser::command(const char *format, ...) {
	debugC(1, kDebugParser, "Command(%s, ...)", format);

	va_list marker;
	va_start(marker, format);
	vsprintf(_vm->_line, format, marker);
	va_end(marker);

	lineHandler();
}

/**
 * Locate any member of object name list appearing in command line
 */
bool Parser::isWordPresent(char **wordArr) const {
	if (wordArr != 0) {
		debugC(1, kDebugParser, "isWordPresent(%s)", wordArr[0]);

		for (int i = 0; strlen(wordArr[i]); i++) {
			if (strstr(_vm->_line, wordArr[i]))
				return true;
		}
	}
	return false;
}

/**
 * Locate word in list of nouns and return ptr to first string in noun list
 */
const char *Parser::findNoun() const {
	debugC(1, kDebugParser, "findNoun()");

	for (int i = 0; _vm->_text->getNounArray(i); i++) {
		for (int j = 0; strlen(_vm->_text->getNoun(i, j)); j++) {
			if (strstr(_vm->_line, _vm->_text->getNoun(i, j)))
				return _vm->_text->getNoun(i, 0);
		}
	}
	return nullptr;
}

/**
 * Locate word in list of verbs and return ptr to first string in verb list
 */
const char *Parser::findVerb() const {
	debugC(1, kDebugParser, "findVerb()");

	for (int i = 0; _vm->_text->getVerbArray(i); i++) {
		for (int j = 0; strlen(_vm->_text->getVerb(i, j)); j++) {
			if (strstr(_vm->_line, _vm->_text->getVerb(i, j)))
				return _vm->_text->getVerb(i, 0);
		}
	}
	return nullptr;
}

/**
 * Show user all objects being carried in a variable width 2 column format
 */
void Parser::showDosInventory() const {
	debugC(1, kDebugParser, "showDosInventory()");
	static const char *const blanks = "                                        ";
	uint16 index = 0, len1 = 0, len2 = 0;

	for (int i = 0; i < _vm->_object->_numObj; i++) { // Find widths of 2 columns
		if (_vm->_object->isCarried(i)) {
			uint16 len = strlen(_vm->_text->getNoun(_vm->_object->_objects[i]._nounIndex, 2));
			if (index++ & 1)                        // Right hand column
				len2 = (len > len2) ? len : len2;
			else
				len1 = (len > len1) ? len : len1;
		}
	}
	len1 += 1;                                      // For gap between columns

	if (len1 + len2 < (uint16)strlen(_vm->_text->getTextParser(kTBOutro)))
		len1 = strlen(_vm->_text->getTextParser(kTBOutro));

	Common::String buffer;
	assert(len1 + len2 - strlen(_vm->_text->getTextParser(kTBIntro)) / 2 < strlen(blanks));
	buffer = Common::String(blanks, (len1 + len2 - strlen(_vm->_text->getTextParser(kTBIntro))) / 2);

	buffer += Common::String(_vm->_text->getTextParser(kTBIntro)) + "\n";
	index = 0;
	for (int i = 0; i < _vm->_object->_numObj; i++) { // Assign strings
		if (_vm->_object->isCarried(i)) {
			if (index++ & 1)
				buffer += Common::String(_vm->_text->getNoun(_vm->_object->_objects[i]._nounIndex, 2)) + "\n";
			else
				buffer += Common::String(_vm->_text->getNoun(_vm->_object->_objects[i]._nounIndex, 2)) + Common::String(blanks, len1 - strlen(_vm->_text->getNoun(_vm->_object->_objects[i]._nounIndex, 2)));
		}
	}
	if (index & 1)
		buffer += "\n";
	buffer += Common::String(_vm->_text->getTextParser(kTBOutro));
	Utils::notifyBox(buffer.c_str());
}

} // End of namespace Hugo