/* 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.
 *
 */

// FIXME: Avoid using printf
#define FORBIDDEN_SYMBOL_EXCEPTION_printf

#define FORBIDDEN_SYMBOL_EXCEPTION_exit

#include <limits.h>

#include "engines/metaengine.h"
#include "base/commandLine.h"
#include "base/plugins.h"
#include "base/version.h"

#include "common/config-manager.h"
#include "common/fs.h"
#include "common/rendermode.h"
#include "common/system.h"
#include "common/textconsole.h"

#include "gui/ThemeEngine.h"

#include "audio/musicplugin.h"

#include "graphics/renderer.h" // ResidualVM

#define DETECTOR_TESTING_HACK
#define UPGRADE_ALL_TARGETS_HACK

namespace Base {

#ifndef DISABLE_COMMAND_LINE

static const char USAGE_STRING[] =
	"%s: %s\n"
	"Usage: %s [OPTIONS]... [GAME]\n"
	"\n"
	"Try '%s --help' for more options.\n"
;

// DONT FIXME: DO NOT ORDER ALPHABETICALLY, THIS IS ORDERED BY IMPORTANCE/CATEGORY! :)
#if defined(__SYMBIAN32__) || defined(__GP32__) || defined(ANDROID) || defined(__DS__) || defined(__3DS__)
static const char HELP_STRING[] = "NoUsageString"; // save more data segment space
#else
static const char HELP_STRING[] =
	"ResidualVM - A 3D game interpreter\n"
	"Usage: %s [OPTIONS]... [GAME]\n"
	"  -v, --version            Display ResidualVM version information and exit\n"
	"  -h, --help               Display a brief help text and exit\n"
	"  -z, --list-games         Display list of supported games and exit\n"
	"  -t, --list-targets       Display list of configured targets and exit\n"
	"  --list-saves=TARGET      Display a list of saved games for the game (TARGET) specified\n"
	"  --auto-detect            Display a list of games from current or specified directory\n"
	"                           and start the first one. Use --path=PATH before --auto-detect\n"
	"                           to specify a directory.\n"
#if defined(WIN32) && !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
	"  --console                Enable the console window (default:enabled)\n"
#endif
	"\n"
	"  -c, --config=CONFIG      Use alternate configuration file\n"
	"  -p, --path=PATH          Path to where the game is installed\n"
	"  -x, --save-slot[=NUM]    Save game slot to load (default: autosave)\n"
	"  -f, --fullscreen         Force full-screen mode\n"
	"  -F, --no-fullscreen      Force windowed mode\n"
	"  --gui-theme=THEME        Select GUI theme\n"
	"  --themepath=PATH         Path to where GUI themes are stored\n"
	"  --list-themes            Display list of all usable GUI themes\n"
	"  -e, --music-driver=MODE  Select music driver (see README for details)\n"
	"  --list-audio-devices     List all available audio devices\n"
	"  -q, --language=LANG      Select language (en,de,fr,it,pt,es,jp,zh,kr,se,gb,\n"
	"                           hb,ru,cz)\n"
	"  -m, --music-volume=NUM   Set the music volume, 0-255 (default: 192)\n"
	"  -s, --sfx-volume=NUM     Set the sfx volume, 0-255 (default: 192)\n"
	"  -r, --speech-volume=NUM  Set the speech volume, 0-255 (default: 192)\n"
	"  --midi-gain=NUM          Set the gain for MIDI playback, 0-1000 (default:\n"
	"                           100) (only supported by some MIDI drivers)\n"
	"  -n, --subtitles          Enable subtitles (use with games that have voice)\n"
	"  -b, --boot-param=NUM     Pass number to the boot script (boot param)\n"
	"  -d, --debuglevel=NUM     Set debug verbosity level\n"
	"  --debugflags=FLAGS       Enable engine specific debug flags\n"
	"                           (separated by commas)\n"
	"  --debug-channels-only    Show only the specified debug channels\n"
	"  -u, --dump-scripts       Enable script dumping if a directory called 'dumps'\n"
	"                           exists in the current directory\n"
	"\n"
	"  --cdrom=DRIVE            CD drive to play CD audio from; can either be a\n"
	"                           drive, path, or numeric index (default: 0 = best\n"
	"                           choice drive)\n"
	"  --joystick[=NUM]         Enable joystick input (default: 0 = first joystick)\n"
	"  --platform=WORD          Specify platform of game (allowed values: 2gs, 3do,\n"
	"                           acorn, amiga, atari, c64, fmtowns, nes, mac, pc, pc98,\n"
	"                           pce, segacd, wii, windows)\n"
	"  --savepath=PATH          Path to where saved games are stored\n"
	"  --extrapath=PATH         Extra path to additional game data\n"
	"  --soundfont=FILE         Select the SoundFont for MIDI playback (only\n"
	"                           supported by some MIDI drivers)\n"
	"  --multi-midi             Enable combination AdLib and native MIDI\n"
	"  --native-mt32            True Roland MT-32 (disable GM emulation)\n"
	"  --enable-gs              Enable Roland GS mode for MIDI playback\n"
	"  --output-rate=RATE       Select output sample rate in Hz (e.g. 22050)\n"
	"  --opl-driver=DRIVER      Select AdLib (OPL) emulator (db, mame)\n"
	"  --talkspeed=NUM          Set talk speed for games (default: 179)\n"
	"  --show-fps               Set the turn on display FPS info\n"
	"  --no-show-fps            Set the turn off display FPS info\n"
	"  --renderer=RENDERER      Select renderer (software, opengl, opengl_shaders)\n"
	"  --aspect-ratio           Enable aspect ratio correction\n"
	"  --bpp=NUM                Select number of bits per pixel, 0 (auto-detect), 16, 32\n"
	"                           (default: 0) (only supported by software renderer)\n"
	"  --[no-]dirtyrects        Enable dirty rectangles optimisation in software renderer\n"
	"                           (default: enabled)\n"
#ifdef ENABLE_EVENTRECORDER
	"  --record-mode=MODE       Specify record mode for event recorder (record, playback,\n"
	"                           passthrough [default])\n"
	"  --record-file-name=FILE  Specify record file name\n"
	"  --disable-display        Disable any gfx output. Used for headless events\n"
	"                           playback by Event Recorder\n"
#endif
	"\n"
#ifdef ENABLE_GRIM
	"  --dimuse-tempo=NUM       Set internal Digital iMuse tempo (10 - 100) per second\n"
	"                           (default: 10)\n"
#endif
	"  --engine-speed=NUM       Set frame per second limit (0 - 100), 0 = no limit\n"
	"                           (default: 60)\n"
;
#endif

static const char *s_appName = "residualvm";

static void NORETURN_PRE usage(const char *s, ...) GCC_PRINTF(1, 2) NORETURN_POST;

static void usage(const char *s, ...) {
	char buf[STRINGBUFLEN];
	va_list va;

	va_start(va, s);
	vsnprintf(buf, STRINGBUFLEN, s, va);
	va_end(va);

#if !(defined(__GP32__) || defined(__SYMBIAN32__) || defined(__DS__))
	printf(USAGE_STRING, s_appName, buf, s_appName, s_appName);
#endif
	exit(1);
}

#endif // DISABLE_COMMAND_LINE


void registerDefaults() {

	// Graphics
	ConfMan.registerDefault("fullscreen", false);
	ConfMan.registerDefault("filtering", false);
	ConfMan.registerDefault("show_fps", false);
	ConfMan.registerDefault("aspect_ratio", false);
	ConfMan.registerDefault("dirtyrects", true);
	ConfMan.registerDefault("bpp", 0);

	// Sound & Music
	ConfMan.registerDefault("music_volume", 192);
	ConfMan.registerDefault("sfx_volume", 192);
	ConfMan.registerDefault("speech_volume", 192);

	ConfMan.registerDefault("music_mute", false);
	ConfMan.registerDefault("sfx_mute", false);
	ConfMan.registerDefault("speech_mute", false);
	ConfMan.registerDefault("mute", false);

	ConfMan.registerDefault("multi_midi", false);
	ConfMan.registerDefault("native_mt32", false);
	ConfMan.registerDefault("enable_gs", false);
	ConfMan.registerDefault("midi_gain", 100);

	ConfMan.registerDefault("music_driver", "auto");
	ConfMan.registerDefault("mt32_device", "null");
	ConfMan.registerDefault("gm_device", "null");

	ConfMan.registerDefault("cdrom", 0);

	ConfMan.registerDefault("enable_unsupported_game_warning", true);

	// Game specific
	ConfMan.registerDefault("path", "");
	ConfMan.registerDefault("platform", Common::kPlatformDOS);
	ConfMan.registerDefault("language", "en");
	ConfMan.registerDefault("subtitles", false);
	ConfMan.registerDefault("boot_param", 0);
	ConfMan.registerDefault("dump_scripts", false);
	ConfMan.registerDefault("save_slot", -1);
	ConfMan.registerDefault("autosave_period", 5 * 60);	// By default, trigger autosave every 5 minutes

	ConfMan.registerDefault("talkspeed", 179);

#ifdef ENABLE_GRIM
	ConfMan.registerDefault("dimuse_tempo", 10);
#endif
	ConfMan.registerDefault("engine_speed", 60);

	// Miscellaneous
	ConfMan.registerDefault("joystick_num", -1);
	ConfMan.registerDefault("confirm_exit", false);
	ConfMan.registerDefault("disable_sdl_parachute", false);

	ConfMan.registerDefault("disable_display", false);
	ConfMan.registerDefault("record_mode", "none");
	ConfMan.registerDefault("record_file_name", "record.bin");

	ConfMan.registerDefault("gui_saveload_chooser", "grid");
	ConfMan.registerDefault("gui_saveload_last_pos", "0");

	ConfMan.registerDefault("gui_browser_show_hidden", false);

#ifdef USE_FLUIDSYNTH
	// The settings are deliberately stored the same way as in Qsynth. The
	// FluidSynth music driver is responsible for transforming them into
	// their appropriate values.
	ConfMan.registerDefault("fluidsynth_chorus_activate", true);
	ConfMan.registerDefault("fluidsynth_chorus_nr", 3);
	ConfMan.registerDefault("fluidsynth_chorus_level", 100);
	ConfMan.registerDefault("fluidsynth_chorus_speed", 30);
	ConfMan.registerDefault("fluidsynth_chorus_depth", 80);
	ConfMan.registerDefault("fluidsynth_chorus_waveform", "sine");

	ConfMan.registerDefault("fluidsynth_reverb_activate", true);
	ConfMan.registerDefault("fluidsynth_reverb_roomsize", 20);
	ConfMan.registerDefault("fluidsynth_reverb_damping", 0);
	ConfMan.registerDefault("fluidsynth_reverb_width", 1);
	ConfMan.registerDefault("fluidsynth_reverb_level", 90);

	ConfMan.registerDefault("fluidsynth_misc_interpolation", "4th");
#endif
}

//
// Various macros used by the command line parser.
//

#ifndef DISABLE_COMMAND_LINE

// Use this for options which have an *optional* value
#define DO_OPTION_OPT(shortCmd, longCmd, defaultVal) \
	if (isLongCmd ? (!strcmp(s+2, longCmd) || !memcmp(s+2, longCmd"=", sizeof(longCmd"=") - 1)) : (tolower(s[1]) == shortCmd)) { \
		s += 2; \
		if (isLongCmd) { \
			s += sizeof(longCmd) - 1; \
			if (*s == '=') \
				s++; \
		} \
		const char *option = s; \
		if (*s == '\0' && !isLongCmd) { option = s2; i++; } \
		if (!option || *option == '\0') option = defaultVal; \
		if (option) settings[longCmd] = option;

// Use this for options which have a required (string) value
#define DO_OPTION(shortCmd, longCmd) \
	DO_OPTION_OPT(shortCmd, longCmd, 0) \
	if (!option) usage("Option '%s' requires an argument", argv[isLongCmd ? i : i-1]);

// Use this for options which have a required integer value
// (we don't check ERANGE because WinCE doesn't support errno, so we're stuck just rejecting LONG_MAX/LONG_MIN..)
#define DO_OPTION_INT(shortCmd, longCmd) \
	DO_OPTION(shortCmd, longCmd) \
	char *endptr; \
	long int retval = strtol(option, &endptr, 0); \
	if (*endptr != '\0' || retval == LONG_MAX || retval == LONG_MIN) \
		usage("--%s: Invalid number '%s'", longCmd, option);

// Use this for boolean options; this distinguishes between "-x" and "-X",
// resp. between "--some-option" and "--no-some-option".
#define DO_OPTION_BOOL(shortCmd, longCmd) \
	if (isLongCmd ? (!strcmp(s+2, longCmd) || !strcmp(s+2, "no-" longCmd)) : (tolower(s[1]) == shortCmd)) { \
		bool boolValue = (Common::isLower(s[1]) != 0); \
		s += 2; \
		if (isLongCmd) { \
			boolValue = !strcmp(s, longCmd); \
			s += boolValue ? (sizeof(longCmd) - 1) : (sizeof("no-" longCmd) - 1); \
		} \
		if (*s != '\0') goto unknownOption; \
		const char *option = boolValue ? "true" : "false"; \
		settings[longCmd] = option;

// Use this for options which never have a value, i.e. for 'commands', like "--help".
#define DO_COMMAND(shortCmd, longCmd) \
	if (isLongCmd ? (!strcmp(s+2, longCmd)) : (tolower(s[1]) == shortCmd)) { \
		s += 2; \
		if (isLongCmd) \
			s += sizeof(longCmd) - 1; \
		if (*s != '\0') goto unknownOption; \
		return longCmd;


#define DO_LONG_OPTION_OPT(longCmd, d)  DO_OPTION_OPT(0, longCmd, d)
#define DO_LONG_OPTION(longCmd)         DO_OPTION(0, longCmd)
#define DO_LONG_OPTION_INT(longCmd)     DO_OPTION_INT(0, longCmd)
#define DO_LONG_OPTION_BOOL(longCmd)    DO_OPTION_BOOL(0, longCmd)
#define DO_LONG_COMMAND(longCmd)        DO_COMMAND(0, longCmd)

// End an option handler
#define END_OPTION \
		continue; \
	}

// End an option handler
#define END_COMMAND \
	}


Common::String parseCommandLine(Common::StringMap &settings, int argc, const char * const *argv) {
	const char *s, *s2;

	if (!argv)
		return Common::String();

	// argv[0] contains the name of the executable.
	if (argv[0]) {
		s = strrchr(argv[0], '/');
		s_appName = s ? (s+1) : argv[0];
	}

	// We store all command line settings into a string map.

	// Iterate over all command line arguments and parse them into our string map.
	for (int i = 1; i < argc; ++i) {
		s = argv[i];
		s2 = (i < argc-1) ? argv[i+1] : 0;

		if (s[0] != '-') {
			// The argument doesn't start with a dash, so it's not an option.
			// Hence it must be the target name. We currently enforce that
			// this always comes last.
			if (i != argc - 1)
				usage("Stray argument '%s'", s);

			// We defer checking whether this is a valid target to a later point.
			return s;
		} else {
			// On MacOS X prior to 10.9 the OS is sometimes adding a -psn_X_XXXXXX argument (where X are digits)
			// to pass the process serial number. We need to ignore it to avoid an error.
#ifdef MACOSX
			if (strncmp(s, "-psn_", 5) == 0)
				continue;
#endif

			bool isLongCmd = (s[0] == '-' && s[1] == '-');

			DO_COMMAND('h', "help")
			END_COMMAND

			DO_COMMAND('v', "version")
			END_COMMAND

			DO_COMMAND('t', "list-targets")
			END_COMMAND

			DO_COMMAND('z', "list-games")
			END_COMMAND

			DO_LONG_COMMAND("auto-detect")
			END_COMMAND

#ifdef DETECTOR_TESTING_HACK
			// HACK FIXME TODO: This command is intentionally *not* documented!
			DO_LONG_COMMAND("test-detector")
			END_COMMAND
#endif

#ifdef UPGRADE_ALL_TARGETS_HACK
			// HACK FIXME TODO: This command is intentionally *not* documented!
			DO_LONG_COMMAND("upgrade-targets")
			END_COMMAND
#endif

			DO_LONG_OPTION("list-saves")
				// FIXME: Need to document this.
				// TODO: Make the argument optional. If no argument is given, list all saved games
				// for all configured targets.
				return "list-saves";
			END_OPTION

			DO_OPTION('c', "config")
			END_OPTION

			DO_OPTION_INT('b', "boot-param")
			END_OPTION

			DO_OPTION_OPT('d', "debuglevel", "0")
			END_OPTION

			DO_LONG_OPTION("debugflags")
			END_OPTION

			DO_LONG_OPTION_BOOL("debug-channels-only")
			END_OPTION

			DO_OPTION('e', "music-driver")
			END_OPTION

			DO_LONG_COMMAND("list-audio-devices")
			END_COMMAND

			DO_LONG_OPTION_INT("output-rate")
			END_OPTION

			DO_OPTION_BOOL('f', "fullscreen")
			END_OPTION

			DO_LONG_OPTION_BOOL("filtering")
			END_OPTION

#ifdef ENABLE_EVENTRECORDER
			DO_LONG_OPTION_INT("disable-display")
			END_OPTION

			DO_LONG_OPTION("record-mode")
			END_OPTION

			DO_LONG_OPTION("record-file-name")
			END_OPTION
#endif

			DO_LONG_OPTION("opl-driver")
			END_OPTION

			DO_OPTION_INT('m', "music-volume")
			END_OPTION

			DO_OPTION_BOOL('n', "subtitles")
			END_OPTION

			DO_OPTION('p', "path")
				Common::FSNode path(option);
				if (!path.exists()) {
					usage("Non-existent game path '%s'", option);
				} else if (!path.isReadable()) {
					usage("Non-readable game path '%s'", option);
				}
			END_OPTION

			DO_OPTION('q', "language")
				if (Common::parseLanguage(option) == Common::UNK_LANG)
					usage("Unrecognized language '%s'", option);
			END_OPTION

			DO_OPTION_INT('s', "sfx-volume")
			END_OPTION

			DO_OPTION_INT('r', "speech-volume")
			END_OPTION

			DO_LONG_OPTION_INT("midi-gain")
			END_OPTION

			DO_OPTION_BOOL('u', "dump-scripts")
			END_OPTION

			DO_OPTION_OPT('x', "save-slot", "0")
			END_OPTION

			DO_LONG_OPTION_INT("cdrom")
			END_OPTION

			DO_LONG_OPTION_OPT("joystick", "0")
				settings["joystick_num"] = option;
				settings.erase("joystick");
			END_OPTION

			DO_LONG_OPTION("platform")
				int platform = Common::parsePlatform(option);
				if (platform == Common::kPlatformUnknown)
					usage("Unrecognized platform '%s'", option);
			END_OPTION

			DO_LONG_OPTION("soundfont")
				Common::FSNode path(option);
				if (!path.exists()) {
					usage("Non-existent soundfont path '%s'", option);
				} else if (!path.isReadable()) {
					usage("Non-readable soundfont path '%s'", option);
				}
			END_OPTION

			DO_LONG_OPTION_BOOL("disable-sdl-parachute")
			END_OPTION

			DO_LONG_OPTION_BOOL("multi-midi")
			END_OPTION

			DO_LONG_OPTION_BOOL("native-mt32")
			END_OPTION

			DO_LONG_OPTION_BOOL("enable-gs")
			END_OPTION

			DO_LONG_OPTION_BOOL("aspect-ratio")
			END_OPTION

			DO_LONG_OPTION_INT("bpp")
			END_OPTION

			DO_LONG_OPTION_BOOL("dirtyrects")
			END_OPTION

			DO_LONG_OPTION("gamma")
			END_OPTION
// ResidualVM specific start
			DO_LONG_OPTION("renderer")
				Graphics::RendererType renderer = Graphics::parseRendererTypeCode(option);
				if (renderer == Graphics::kRendererTypeDefault)
					usage("Unrecognized renderer type '%s'", option);
			END_OPTION

			DO_LONG_OPTION_BOOL("show-fps")
// ResidualVM specific end
			END_OPTION

			DO_LONG_OPTION("savepath")
				Common::FSNode path(option);
				if (!path.exists()) {
					usage("Non-existent saved games path '%s'", option);
				} else if (!path.isWritable()) {
					usage("Non-writable saved games path '%s'", option);
				}
			END_OPTION

			DO_LONG_OPTION("extrapath")
				Common::FSNode path(option);
				if (!path.exists()) {
					usage("Non-existent extra path '%s'", option);
				} else if (!path.isReadable()) {
					usage("Non-readable extra path '%s'", option);
				}
			END_OPTION

			DO_LONG_OPTION_INT("talkspeed")
			END_OPTION

			DO_LONG_OPTION("gui-theme")
			END_OPTION

			DO_LONG_OPTION("themepath")
				Common::FSNode path(option);
				if (!path.exists()) {
					usage("Non-existent theme path '%s'", option);
				} else if (!path.isReadable()) {
					usage("Non-readable theme path '%s'", option);
				}
			END_OPTION

			DO_LONG_COMMAND("list-themes")
			END_COMMAND

			DO_LONG_OPTION("target-md5")
			END_OPTION

#ifdef ENABLE_GRIM
			DO_LONG_OPTION_INT("dimuse-tempo")
			END_OPTION
#endif


			DO_LONG_OPTION_INT("engine-speed")
			END_OPTION

			DO_LONG_OPTION("speech-mode")
			END_OPTION

#ifdef IPHONE
			// This is automatically set when launched from the Springboard.
			DO_LONG_OPTION_OPT("launchedFromSB", 0)
			END_OPTION
#endif

#if defined(WIN32) && !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
			// Optional console window on Windows (default: enabled)
			DO_LONG_OPTION_BOOL("console")
			END_OPTION
#endif

unknownOption:
			// If we get till here, the option is unhandled and hence unknown.
			usage("Unrecognized option '%s'", argv[i]);
		}
	}

	return Common::String();
}

/** List all supported game IDs, i.e. all games which any loaded plugin supports. */
static void listGames() {
	printf("Game ID              Full Title                                            \n"
	       "-------------------- ------------------------------------------------------\n");

	const EnginePlugin::List &plugins = EngineMan.getPlugins();
	for (EnginePlugin::List::const_iterator iter = plugins.begin(); iter != plugins.end(); ++iter) {
		GameList list = (**iter)->getSupportedGames();
		for (GameList::iterator v = list.begin(); v != list.end(); ++v) {
			printf("%-20s %s\n", v->gameid().c_str(), v->description().c_str());
		}
	}
}

/** List all targets which are configured in the config file. */
static void listTargets() {
	printf("Target               Description                                           \n"
	       "-------------------- ------------------------------------------------------\n");

	using namespace Common;
	const ConfigManager::DomainMap &domains = ConfMan.getGameDomains();
	ConfigManager::DomainMap::const_iterator iter;

	Common::Array<Common::String> targets;
	targets.reserve(domains.size());

	for (iter = domains.begin(); iter != domains.end(); ++iter) {
		Common::String name(iter->_key);
		Common::String description(iter->_value.getVal("description"));

		if (description.empty()) {
			// FIXME: At this point, we should check for a "gameid" override
			// to find the proper desc. In fact, the platform probably should
			// be taken into account, too.
			Common::String gameid(name);
			GameDescriptor g = EngineMan.findGame(gameid);
			if (g.description().size() > 0)
				description = g.description();
		}

		targets.push_back(Common::String::format("%-20s %s", name.c_str(), description.c_str()));
	}

	Common::sort(targets.begin(), targets.end());

	for (Common::Array<Common::String>::const_iterator i = targets.begin(), end = targets.end(); i != end; ++i)
		printf("%s\n", i->c_str());
}

/** List all saves states for the given target. */
static Common::Error listSaves(const char *target) {
	Common::Error result = Common::kNoError;

	// FIXME HACK
	g_system->initBackend();

	// Grab the "target" domain, if any
	const Common::ConfigManager::Domain *domain = ConfMan.getDomain(target);

	// Set up the game domain as newly active domain, so
	// target specific savepath will be checked
	Common::String oldDomain = ConfMan.getActiveDomainName();
	ConfMan.setActiveDomain(target);

	// Grab the gameid from the domain resp. use the target as gameid
	Common::String gameid;
	if (domain)
		gameid = domain->getVal("gameid");
	if (gameid.empty())
		gameid = target;
	gameid.toLowercase();	// Normalize it to lower case

	// Find the plugin that will handle the specified gameid
	const EnginePlugin *plugin = 0;
	GameDescriptor game = EngineMan.findGame(gameid, &plugin);

	if (!plugin) {
		return Common::Error(Common::kEnginePluginNotFound,
						Common::String::format("target '%s', gameid '%s", target, gameid.c_str()));
	}

	if (!(*plugin)->hasFeature(MetaEngine::kSupportsListSaves)) {
		// TODO: Include more info about the target (desc, engine name, ...) ???
		return Common::Error(Common::kEnginePluginNotSupportSaves,
						Common::String::format("target '%s', gameid '%s", target, gameid.c_str()));
	} else {
		// Query the plugin for a list of saved games
		SaveStateList saveList = (*plugin)->listSaves(target);

		if (saveList.size() > 0) {
			// TODO: Include more info about the target (desc, engine name, ...) ???
			printf("Save states for target '%s' (gameid '%s'):\n", target, gameid.c_str());
			printf("  Slot Description                                           \n"
				   "  ---- ------------------------------------------------------\n");

			for (SaveStateList::const_iterator x = saveList.begin(); x != saveList.end(); ++x) {
				printf("  %-4d %s\n", x->getSaveSlot(), x->getDescription().c_str());
				// TODO: Could also iterate over the full hashmap, printing all key-value pairs
			}
		} else {
			printf("There are no save states for target '%s' (gameid '%s'):\n", target, gameid.c_str());
		}
	}

	// Revert to the old active domain
	ConfMan.setActiveDomain(oldDomain);

	return result;
}

/** Lists all usable themes */
static void listThemes() {
	typedef Common::List<GUI::ThemeEngine::ThemeDescriptor> ThList;
	ThList thList;
	GUI::ThemeEngine::listUsableThemes(thList);

	printf("Theme          Description\n");
	printf("-------------- ------------------------------------------------\n");

	for (ThList::const_iterator i = thList.begin(); i != thList.end(); ++i)
		printf("%-14s %s\n", i->id.c_str(), i->name.c_str());
}

/** Lists all output devices */
static void listAudioDevices() {
	MusicPlugin::List pluginList = MusicMan.getPlugins();

	printf("ID                             Description\n");
	printf("------------------------------ ------------------------------------------------\n");

	for (MusicPlugin::List::const_iterator i = pluginList.begin(), iend = pluginList.end(); i != iend; ++i) {
		MusicDevices deviceList = (**i)->getDevices();
		for (MusicDevices::iterator j = deviceList.begin(), jend = deviceList.end(); j != jend; ++j) {
			printf("%-30s %s\n", Common::String::format("\"%s\"", j->getCompleteId().c_str()).c_str(), j->getCompleteName().c_str());
		}
	}
}

/** Display all games in the given directory, or current directory if empty */
static bool autoDetect(Common::String path) {
	if (path.empty())
		path = ".";
	//Current directory
	Common::FSNode dir(path);

	Common::FSList files;

	//Collect all files from directory
	dir.getChildren(files, Common::FSNode::kListAll);

	GameList candidates(EngineMan.detectGames(files));
	if (candidates.empty()) {
		printf("ScummVM could not find any game in %s\n", path.c_str());
		return false;
	}

	// Print all the candidate found
	printf("ID                   Description\n");
	printf("-------------------- ---------------------------------------------------------\n");
	for (GameList::iterator v = candidates.begin(); v != candidates.end(); ++v) {
		printf("%-20s %s\n", v->gameid().c_str(), v->description().c_str());
	}
	// Set the active domain to the first one to start it.
	ConfMan.setActiveDomain(candidates.begin()->gameid());
	return true;
}

#ifdef DETECTOR_TESTING_HACK
static void runDetectorTest() {
	// HACK: The following code can be used to test the detection code of our
	// engines. Basically, it loops over all targets, and calls the detector
	// for the given path. It then prints out the result and also checks
	// whether the result agrees with the settings of the target.

	const Common::ConfigManager::DomainMap &domains = ConfMan.getGameDomains();
	Common::ConfigManager::DomainMap::const_iterator iter = domains.begin();
	int success = 0, failure = 0;
	for (iter = domains.begin(); iter != domains.end(); ++iter) {
		Common::String name(iter->_key);
		Common::String gameid(iter->_value.getVal("gameid"));
		Common::String path(iter->_value.getVal("path"));
		printf("Looking at target '%s', gameid '%s', path '%s' ...\n",
				name.c_str(), gameid.c_str(), path.c_str());
		if (path.empty()) {
			printf(" ... no path specified, skipping\n");
			continue;
		}
		if (gameid.empty()) {
			gameid = name;
		}

		Common::FSNode dir(path);
		Common::FSList files;
		if (!dir.getChildren(files, Common::FSNode::kListAll)) {
			printf(" ... invalid path, skipping\n");
			continue;
		}

		GameList candidates(EngineMan.detectGames(files));
		bool gameidDiffers = false;
		GameList::iterator x;
		for (x = candidates.begin(); x != candidates.end(); ++x) {
			gameidDiffers |= (scumm_stricmp(gameid.c_str(), x->gameid().c_str()) != 0);
		}

		if (candidates.empty()) {
			printf(" FAILURE: No games detected\n");
			failure++;
		} else if (candidates.size() > 1) {
			if (gameidDiffers) {
				printf(" WARNING: Multiple games detected, some/all with wrong gameid\n");
			} else {
				printf(" WARNING: Multiple games detected, but all have matching gameid\n");
			}
			failure++;
		} else if (gameidDiffers) {
			printf(" FAILURE: Wrong gameid detected\n");
			failure++;
		} else {
			printf(" SUCCESS: Game was detected correctly\n");
			success++;
		}

		for (x = candidates.begin(); x != candidates.end(); ++x) {
			printf("    gameid '%s', desc '%s', language '%s', platform '%s'\n",
				   x->gameid().c_str(),
				   x->description().c_str(),
				   Common::getLanguageCode(x->language()),
				   Common::getPlatformCode(x->platform()));
		}
	}
	int total = domains.size();
	printf("Detector test run: %d fail, %d success, %d skipped, out of %d\n",
			failure, success, total - failure - success, total);
}
#endif

#ifdef UPGRADE_ALL_TARGETS_HACK
void upgradeTargets() {
	// HACK: The following upgrades all your targets to the latest and
	// greatest. Right now that means updating the guioptions and (optionally)
	// also the game descriptions.
	// Basically, it loops over all targets, and calls the detector for the
	// given path. It then compares the result with the settings of the target.
	// If the basics seem to match, it updates the guioptions.

	printf("Upgrading all your existing targets\n");

	Common::ConfigManager::DomainMap::iterator iter = ConfMan.beginGameDomains();
	for (; iter != ConfMan.endGameDomains(); ++iter) {
		Common::ConfigManager::Domain &dom = iter->_value;
		Common::String name(iter->_key);
		Common::String gameid(dom.getVal("gameid"));
		Common::String path(dom.getVal("path"));
		printf("Looking at target '%s', gameid '%s' ...\n",
				name.c_str(), gameid.c_str());
		if (path.empty()) {
			printf(" ... no path specified, skipping\n");
			continue;
		}
		if (gameid.empty()) {
			gameid = name;
		}
		gameid.toLowercase();	// TODO: Is this paranoia? Maybe we should just assume all lowercase, always?

		Common::FSNode dir(path);
		Common::FSList files;
		if (!dir.getChildren(files, Common::FSNode::kListAll)) {
			printf(" ... invalid path, skipping\n");
			continue;
		}

		Common::Language lang = Common::parseLanguage(dom.getVal("language"));
		Common::Platform plat = Common::parsePlatform(dom.getVal("platform"));
		Common::String desc(dom.getVal("description"));

		GameList candidates(EngineMan.detectGames(files));
		GameDescriptor *g = 0;

		// We proceed as follows:
		// * If detection failed to produce candidates, skip.
		// * If there is a unique detector match, trust it.
		// * If there are multiple match, run over them comparing gameid, language and platform.
		//   If we end up with a unique match, use it. Otherwise, skip.
		if (candidates.size() == 0) {
			printf(" ... failed to detect game, skipping\n");
			continue;
		}
		if (candidates.size() > 1) {
			// Scan over all candidates, check if there is a unique match for gameid, language and platform
			GameList::iterator x;
			int matchesFound = 0;
			for (x = candidates.begin(); x != candidates.end(); ++x) {
				if (x->gameid() == gameid && x->language() == lang && x->platform() == plat) {
					matchesFound++;
					g = &(*x);
				}
			}
			if (matchesFound != 1) {
				printf(" ... detected multiple games, could not establish unique match, skipping\n");
				continue;
			}
		} else {
			// Unique match -> use it
			g = &candidates[0];
		}

		// At this point, g points to a GameDescriptor which we can use to update
		// the target referred to by dom. We update several things

		// Always set the gameid explicitly (in case of legacy targets)
		dom["gameid"] = g->gameid();

		// Always set the GUI options. The user should not modify them, and engines might
		// gain more features over time, so we want to keep this list up-to-date.
		if (g->contains("guioptions")) {
			printf("  -> update guioptions to '%s'\n", (*g)["guioptions"].c_str());
			dom["guioptions"] = (*g)["guioptions"];
		} else if (dom.contains("guioptions")) {
			dom.erase("guioptions");
		}

		// Update the language setting but only if none has been set yet.
		if (lang == Common::UNK_LANG && g->language() != Common::UNK_LANG) {
			printf("  -> set language to '%s'\n", Common::getLanguageCode(g->language()));
			dom["language"] = (*g)["language"];
		}

		// Update the platform setting but only if none has been set yet.
		if (plat == Common::kPlatformUnknown && g->platform() != Common::kPlatformUnknown) {
			printf("  -> set platform to '%s'\n", Common::getPlatformCode(g->platform()));
			dom["platform"] = (*g)["platform"];
		}

		// TODO: We could also update the description. But not everybody will want that.
		// Esp. because for some games (e.g. the combined Zak/Loom FM-TOWNS demo etc.)
		// ScummVM still generates an incorrect description string. So, the description
		// should only be updated if the user explicitly requests this.
#if 0
		if (desc != g->description()) {
			printf("  -> update desc from '%s' to\n                      '%s' ?\n", desc.c_str(), g->description().c_str());
			dom["description"] = (*g)["description"];
		}
#endif
	}

	// Finally, save our changes to disk
	ConfMan.flushToDisk();
}
#endif

#else // DISABLE_COMMAND_LINE


Common::String parseCommandLine(Common::StringMap &settings, int argc, const char * const *argv) {
	return Common::String();
}


#endif // DISABLE_COMMAND_LINE


bool processSettings(Common::String &command, Common::StringMap &settings, Common::Error &err) {
	err = Common::kNoError;

#ifndef DISABLE_COMMAND_LINE

	// Handle commands passed via the command line (like --list-targets and
	// --list-games). This must be done after the config file and the plugins
	// have been loaded.
	if (command == "list-targets") {
		listTargets();
		return true;
	} else if (command == "list-games") {
		listGames();
		return true;
	} else if (command == "list-saves") {
		err = listSaves(settings["list-saves"].c_str());
		return true;
	} else if (command == "list-themes") {
		listThemes();
		return true;
	} else if (command == "list-audio-devices") {
		listAudioDevices();
		return true;
	} else if (command == "version") {
		printf("%s\n", gScummVMFullVersion);
		printf("Features compiled in: %s\n", gScummVMFeatures);
		return true;
	} else if (command == "help") {
		printf(HELP_STRING, s_appName);
		return true;
	} else if (command == "auto-detect") {
		// If auto-detects succeed, we want to return false so that the game is started
		return !autoDetect(settings["path"]);
		//return true;
	}
#ifdef DETECTOR_TESTING_HACK
	else if (command == "test-detector") {
		runDetectorTest();
		return true;
	}
#endif
#ifdef UPGRADE_ALL_TARGETS_HACK
	else if (command == "upgrade-targets") {
		upgradeTargets();
		return true;
	}
#endif

#endif // DISABLE_COMMAND_LINE


	// If a target was specified, check whether there is either a game
	// domain (i.e. a target) matching this argument, or alternatively
	// whether there is a gameid matching that name.
	if (!command.empty()) {
		GameDescriptor gd = EngineMan.findGame(command);
		if (ConfMan.hasGameDomain(command) || !gd.gameid().empty()) {
			bool idCameFromCommandLine = false;

			// WORKAROUND: Fix for bug #1719463: "DETECTOR: Launching
			// undefined target adds launcher entry"
			//
			// We designate gameids which come strictly from command line
			// so AdvancedDetector will not save config file with invalid
			// gameid in case target autoupgrade was performed
			if (!ConfMan.hasGameDomain(command)) {
				idCameFromCommandLine = true;
			}

			ConfMan.setActiveDomain(command);

			if (idCameFromCommandLine)
				ConfMan.set("id_came_from_command_line", "1");

		} else {
#ifndef DISABLE_COMMAND_LINE
			usage("Unrecognized game target '%s'", command.c_str());
#endif // DISABLE_COMMAND_LINE
		}
	}


	// Finally, store the command line settings into the config manager.
	for (Common::StringMap::const_iterator x = settings.begin(); x != settings.end(); ++x) {
		Common::String key(x->_key);
		Common::String value(x->_value);

		// Replace any "-" in the key by "_" (e.g. change "save-slot" to "save_slot").
		for (Common::String::iterator c = key.begin(); c != key.end(); ++c)
			if (*c == '-')
				*c = '_';

		// Store it into ConfMan.
		ConfMan.set(key, value, Common::ConfigManager::kTransientDomain);
	}

	return false;
}

} // End of namespace Base
