/* 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
 *
 */

#include "common/system.h"

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

namespace Hugo {

#define BLINKS  2                                   // Cursor blinks per second
#define CX(X)   LOWORD(X)
#define CY(Y)   HIWORD(Y)

Parser::Parser(HugoEngine &vm) :
	_vm(vm), _putIndex(0), _getIndex(0), _checkDoubleF1Fl(false) {
}

Parser::~Parser() {
}

void Parser::keyHandler(uint16 nChar, uint16 nFlags) {
	debugC(1, kDebugParser, "keyHandler(%d, %d)", nChar, nFlags);

	status_t &gameStatus = _vm.getGameStatus();
	bool repeatedFl = (nFlags & 0x4000);            // TRUE if key is a repeat

// 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.inventoryState == I_ACTIVE)  // Remove inventory, if displayed
			gameStatus.inventoryState = I_UP;
		gameStatus.inventoryObjId = -1;             // Deselect any dragged icon
		break;
	case Common::KEYCODE_END:
	case Common::KEYCODE_HOME:
	case Common::KEYCODE_LEFT:
	case Common::KEYCODE_RIGHT:
	case Common::KEYCODE_UP:
	case Common::KEYCODE_DOWN:
		if (!repeatedFl) {
			gameStatus.routeIndex = -1;             // Stop any automatic route
			_vm.route().setWalk(nChar);             // Direction of hero travel
		}
		break;
	case Common::KEYCODE_F1:                        // User Help (DOS)
		if (_checkDoubleF1Fl)
			_vm.file().instructions();
		else
			_vm.screen().userHelp();
		_checkDoubleF1Fl = !_checkDoubleF1Fl;
		break;
	case Common::KEYCODE_F6:                        // Inventory
		showDosInventory();
		break;
	case Common::KEYCODE_F8:                        // Turbo mode
		_config.turboFl = !_config.turboFl;
		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
	case Common::KEYCODE_F5:                        // Restore game
	case Common::KEYCODE_F9:                        // Boss button
		warning("STUB: KeyHandler() - F4-F5-F9 (DOS)");
		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] = nChar;
				_putIndex = bnext;
			}
		}
		break;
	}
	if (_checkDoubleF1Fl && (nChar != Common::KEYCODE_F1))
		_checkDoubleF1Fl = false;
}

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

	static int16  lineIndex = 0;                    // Index into line
	static uint32 tick = 0;                         // For flashing cursor
	static char   cursor = '_';
	static        command_t cmdLine;                // Build command line
	status_t     &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 (lineIndex)
				cmdLine[--lineIndex] = '\0';
			break;
		case Common::KEYCODE_RETURN:                // EOL, pass line to line handler
			if (lineIndex && (_vm._hero->pathType != QUIET)) {
				// Remove inventory bar if active
				if (gameStatus.inventoryState == I_ACTIVE)
					gameStatus.inventoryState = I_UP;
				// Call Line handler and reset line
				command(cmdLine);
				cmdLine[lineIndex = 0] = '\0';
			}
			break;
		default:                                    // Normal text key, add to line
			if (lineIndex >= MAX_CHARS) {
				//MessageBeep(MB_ICONASTERISK);
				warning("STUB: MessageBeep(MB_ICONASTERISK);");
			} else if (isprint(c)) {
				cmdLine[lineIndex++] = c;
				cmdLine[lineIndex] = '\0';
			}
			break;
		}
	}

	// See if time to blink cursor, set cursor character
	if ((tick++ % (TPS / BLINKS)) == 0)
		cursor = (cursor == '_') ? ' ' : '_';

	// See if recall button pressed
	if (gameStatus.recallFl) {
		// Copy previous line to current cmdline
		gameStatus.recallFl = false;
		strcpy(cmdLine, _line);
		lineIndex = strlen(cmdLine);
	}

	sprintf(_vm._statusLine, ">%s%c", cmdLine, cursor);
	sprintf(_vm._scoreLine, "F1-Help  %s  Score: %d of %d Sound %s", (_config.turboFl) ? "T" : " ", _vm.getScore(), _vm.getMaxScore(), (_config.soundFl) ? "On" : "Off");

	// See if "look" button pressed
	if (gameStatus.lookFl) {
		command("look around");
		gameStatus.lookFl = 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(_line, format, marker);
	va_end(marker);

	lineHandler();
}

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

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

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

	for (int i = 0; _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;
}

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

	for (int i = 0; _vm._arrayVerbs[i]; i++) {
		for (int j = 0; strlen(_vm._arrayVerbs[i][j]); j++) {
			if (strstr(_line, _vm._arrayVerbs[i][j]))
				return _vm._arrayVerbs[i][0];
		}
	}
	return 0;
}

// Describe any takeable objects visible in this screen
void Parser::showTakeables() {
	debugC(1, kDebugParser, "showTakeables");

	for (int j = 0; j < _vm._numObj; j++) {
		object_t *obj = &_vm._objects[j];
		if ((obj->cycling != INVISIBLE) &&
		    (obj->screenIndex == *_vm._screen_p) &&
		    (((TAKE & obj->genericCmd) == TAKE) || obj->objValue)) {
			Utils::Box(BOX_ANY, "You can also see:\n%s.", _vm._arrayNouns[obj->nounIndex][LOOK_NAME]);
		}
	}
}

// Return TRUE if object being carried by hero
bool Parser::isCarrying(uint16 wordIndex) {
	debugC(1, kDebugParser, "isCarrying(%d)", wordIndex);

	for (int i = 0; i < _vm._numObj; i++) {
		if ((wordIndex == _vm._objects[i].nounIndex) && _vm._objects[i].carriedFl)
			return true;
	}
	return false;
}

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

	for (int i = 0; i < _vm._numObj; i++) {         // Find widths of 2 columns
		if (_vm._objects[i].carriedFl) {
			uint16 len = strlen(_vm._arrayNouns[_vm._objects[i].nounIndex][1]);
			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._textParser[kTBOutro]))
		len1 = strlen(_vm._textParser[kTBOutro]);

	char buffer[XBYTES *NUM_ROWS] = "\0";
	strncat(buffer, blanks, (len1 + len2 - strlen(_vm._textParser[kTBIntro])) / 2);
	strcat(strcat(buffer, _vm._textParser[kTBIntro]), "\n");
	index = 0;
	for (int i = 0; i < _vm._numObj; i++) {         // Assign strings
		if (_vm._objects[i].carriedFl) {
			if (index++ & 1)
				strcat(strcat(buffer, _vm._arrayNouns[_vm._objects[i].nounIndex][1]), "\n");
			else
				strncat(strcat(buffer, _vm._arrayNouns[_vm._objects[i].nounIndex][1]), blanks, len1 - strlen(_vm._arrayNouns[_vm._objects[i].nounIndex][1]));
		}
	}
	if (index & 1)
		strcat(buffer, "\n");
	strcat(buffer, _vm._textParser[kTBOutro]);

	Utils::Box(BOX_ANY, "%s", buffer);
}

} // End of namespace Hugo