/******************************************************************************
*                            recordMyDesktop                                  *
*******************************************************************************
*                                                                             *
*            Copyright (C) 2006,2007,2008 John Varouhakis                     *
*            Copyright (C) 2009           Martin Nordholts                    *
*                                                                             *
*                                                                             *
*   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  *
*                                                                             *
*                                                                             *
*                                                                             *
*   For further information contact me at johnvarouhakis@gmail.com            *
******************************************************************************/

#include "config.h"
#include "rmd_parseargs.h"

#include "rmd_types.h"

#include <popt.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#ifdef HAVE_LIBJACK
#define RMD_LIBJACK_STATUS "Enabled"
#define RMD_USE_JACK_EXTRA_FLAG 0
#else
#define RMD_LIBJACK_STATUS "Disabled"
#define RMD_USE_JACK_EXTRA_FLAG POPT_ARGFLAG_DOC_HIDDEN
#endif

#ifdef HAVE_LIBASOUND
#define RMD_LIBASOUND_STATUS "ALSA"
#else
#define RMD_LIBASOUND_STATUS "OSS"
#endif

#define RMD_ARG_DELAY 1
#define RMD_ARG_DUMMY_CURSOR 2
#define RMD_ARG_USE_JACK 3

#define RMD_OPTION_TABLE(name, table) \
        { NULL, '\0', \
          POPT_ARG_INCLUDE_TABLE, (table), \
          0, (name), NULL }


static void rmdPrintAndExit(poptContext con, enum poptCallbackReason reason, const struct poptOption *opt, const char *arg, const void *data);
static boolean rmdValidateArguments(const ProgArgs *args);


boolean rmdParseArgs(int argc, char **argv, ProgArgs *arg_return)
{
	poptContext popt_context = NULL;
	boolean no_cursor = FALSE;
	boolean quick_subsampling = FALSE;
	boolean compress_cache = FALSE;
	boolean success = TRUE;
	int arg_id = 0;

	// Setup the option tables
	struct poptOption generic_options[] = {
		{ NULL, '\0',
		  POPT_ARG_CALLBACK, (void *)rmdPrintAndExit, 0,
		  NULL, NULL },

		{ "help", 'h',
		  POPT_ARG_NONE, NULL, 0,
		  "Print this help and exit.",
		  NULL },

		{ "version", '\0',
		  POPT_ARG_NONE, NULL, 0,
		  "Print program version and exit.",
		  NULL },

		{ "print-config", '\0',
		  POPT_ARG_NONE, NULL, 0,
		  "Print info about options selected during compilation and exit.",
		  NULL },

		POPT_TABLEEND };

	struct poptOption image_options[] = {
		{ "windowid", '\0',
		  POPT_ARG_INT, &arg_return->windowid, 0,
		  "id of window to be recorded.",
		  "id_of_window" },

		{ "display", '\0',
		  POPT_ARG_STRING, &arg_return->display, 0,
		  "Display to connect to.",
		  "DISPLAY" },

		{ "x", 'x',
		  POPT_ARG_INT, &arg_return->x, 0,
		  "Offset in x direction.",
		  "N>=0" },

		{ "y", 'y',
		  POPT_ARG_INT, &arg_return->y, 0,
		  "Offset in y direction.",
		  "N>=0" },

		{ "width", '\0',
		  POPT_ARG_INT, &arg_return->width, 0,
		  "Width of recorded window.",
		  "N>0" },

		{ "height", '\0',
		  POPT_ARG_INT, &arg_return->height, 0,
		  "Height of recorded window.",
		  "N>0" },

		{ "dummy-cursor", '\0',
		  POPT_ARG_STRING, NULL, RMD_ARG_DUMMY_CURSOR,
		  "Color of the dummy cursor [black|white].",
		  "color" },

		{ "no-cursor", '\0',
		  POPT_ARG_NONE, &no_cursor, 0,
		  "Disable drawing of the cursor.",
		  NULL },

		{ "no-shared", '\0',
		  POPT_ARG_NONE, &arg_return->noshared, 0,
		  "Disable usage of MIT-shared memory extension (Not Recommended!).",
		  NULL },

		{ "full-shots", '\0',
		  POPT_ARG_NONE, &arg_return->full_shots, 0,
		  "Take full screenshot at every frame (Not recomended!).",
		  NULL },

		{ "follow-mouse", '\0',
		  POPT_ARG_NONE, &arg_return->follow_mouse, 0,
		  "Makes the capture area follow the mouse cursor. Autoenables --full-shots.",
		  NULL },

		{ "quick-subsampling", '\0',
		  POPT_ARG_NONE, &quick_subsampling, 0,
		  "Do subsampling of the chroma planes by discarding, not averaging.",
		  NULL },

		{ "fps", '\0',
		  POPT_ARG_FLOAT, &arg_return->fps, 0,
		  "A positive number denoting desired framerate.",
		  "N(number>0.0)" },

		POPT_TABLEEND };

	struct poptOption sound_options[] = {
		{ "channels", '\0',
		  POPT_ARG_INT, &arg_return->channels, 0,
		  "A positive number denoting desired sound channels in recording.",
		  "N" },

		{ "freq", '\0',
		  POPT_ARG_INT, &arg_return->frequency, 0,
		  "A positive number denoting desired sound frequency.",
		  "N" },

		{ "buffer-size", '\0',
		  POPT_ARG_INT, &arg_return->buffsize, 0,
		  "A positive number denoting the desired sound buffer size (in frames, when using ALSA or OSS)",
		  "N" },

		{ "ring-buffer-size", '\0',
		  POPT_ARG_FLOAT, &arg_return->jack_ringbuffer_secs, 0,
		  "A float number denoting the desired ring buffer size (in seconds, when using JACK only).",
		  "N" },

		{ "device", '\0',
		  POPT_ARG_STRING, &arg_return->device, 0,
		  "Sound device (default " DEFAULT_AUDIO_DEVICE ").",
		  "SOUND_DEVICE" },

		{ "use-jack", '\0',
		  POPT_ARG_STRING | RMD_USE_JACK_EXTRA_FLAG, 0, RMD_ARG_USE_JACK,
		  "Record audio from the specified jack port (repeat flag for multiple ports, max 100).",
		  "JACK_PORT" },

		{ "no-sound", '\0',
		  POPT_ARG_NONE, &arg_return->nosound, 0,
		  "Do not record sound.",
		  NULL },

		POPT_TABLEEND };

	struct poptOption encoding_options[] = {
		{ "on-the-fly-encoding", '\0',
		  POPT_ARG_NONE, &arg_return->encOnTheFly, 0,
		  "Encode the audio-video data, while recording.",
		  NULL },

		{ "v_quality", '\0',
		  POPT_ARG_INT, &arg_return->v_quality, 0,
		  "A number from 0 to 63 for desired encoded video quality (default 63).",
		  "n" },

		{ "v_bitrate", '\0',
		  POPT_ARG_INT, &arg_return->v_bitrate, 0,
		  "A number from 0 to 2000000 for desired encoded video bitrate (default 0).",
		  "n" },

		{ "s_quality", '\0',
		  POPT_ARG_INT, &arg_return->s_quality, 0,
		  "Desired audio quality (-1 to 10).",
		  "n" },

		POPT_TABLEEND };

	struct poptOption misc_options[] = {
		{ "rescue", '\0',
		  POPT_ARG_STRING, &arg_return->rescue_path, 0,
		  "Encode data from a previous, crashed, session.",
		  "path_to_data" },

		{ "no-encode", '\0',
		  POPT_ARG_NONE | POPT_ARGFLAG_DOC_HIDDEN, &arg_return->no_encode, 0,
		  "Do not encode any data after recording is complete. This is instead done manually afterwards with --rescue.",
		  NULL },

		{ "no-wm-check", '\0',
		  POPT_ARG_NONE, &arg_return->nowmcheck, 0,
		  "Do not try to detect the window manager (and set options according to it).",
		  NULL },

		{ "no-frame", '\0',
		  POPT_ARG_NONE, &arg_return->noframe, 0,
		  "Do not show the frame that visualizes the recorded area.",
		  NULL },

		{ "pause-shortcut", '\0',
		  POPT_ARG_STRING, &arg_return->pause_shortcut, 0,
		  "Shortcut that will be used for (un)pausing (default Control+Mod1+p).",
		  "MOD+KEY" },

		{ "stop-shortcut", '\0',
		  POPT_ARG_STRING, &arg_return->stop_shortcut, 0,
		  "Shortcut that will be used to stop the recording (default Control+Mod1+s).",
		  "MOD+KEY" },

		{ "need-shortcuts", '\0',
		  POPT_ARG_NONE, &arg_return->need_shortcuts, 0,
		  "Treat shorcut installation failures as fatal.",
		  NULL },

		{ "compress-cache", '\0',
		  POPT_ARG_NONE, &compress_cache, 0,
		  "Image data are cached with light compression.",
		  NULL },

		{ "periodic-datasync-ms", '\0',
		  POPT_ARG_INT, &arg_return->periodic_datasync_ms, 0,
		  "Asynchronously fdatasync() cache files every specified ms while writing, 0 disables (default 100).",
		  "N>=0"},

		{ "workdir", '\0',
		  POPT_ARG_STRING, &arg_return->workdir, 0,
		  "Location where a temporary directory will be created to hold project files (default $HOME).",
		  "DIR" },

		{ "delay", '\0',
		  POPT_ARG_STRING, &arg_return->delay, RMD_ARG_DELAY,
		  "Number of seconds (default), minutes or hours before capture starts (number can be float)",
		  "n[H|h|M|m]" },

		{ "overwrite", '\0',
		  POPT_ARG_NONE, &arg_return->overwrite, 0,
		  "If there is already a file with the same name, delete it (default is to add a number postfix to the new one).",
		  NULL },

		{ "output", 'o',
		  POPT_ARG_STRING, &arg_return->filename, 0,
		  "Name of recorded video (default out.ogv).",
		  "filename" },

		POPT_TABLEEND };

	struct poptOption rmd_args[] = {
		RMD_OPTION_TABLE("Generic Options", generic_options),
		RMD_OPTION_TABLE("Image Options", image_options),
		RMD_OPTION_TABLE("Sound Options", sound_options),
		RMD_OPTION_TABLE("Encoding Options", encoding_options),
		RMD_OPTION_TABLE("Misc Options", misc_options),
		POPT_TABLEEND };


	// Some trivial setup
	popt_context = poptGetContext(NULL, argc, (const char **)argv, rmd_args, 0);
	poptSetOtherOptionHelp(popt_context, "[OPTIONS]^filename");


	// Parse the arguments
	while ((arg_id = poptGetNextOpt(popt_context)) > 0) {
		const char *arg = poptGetOptArg(popt_context);

		// Most arguments are handled completely by libpopt but we
		// handle some by ourself, namely those in this switch case
		switch (arg_id) {
			case RMD_ARG_DELAY:
			{
				float num = atof(arg);

				if (num > 0.0) {
					int k;
					for (k = 0; k < strlen(arg); k++) {
						if ((arg[k] == 'M') || (arg[k] == 'm')) {
							num *= 60.0;
							break;
						}
						else if ((arg[k] == 'H') || (arg[k] == 'h')) {
							num *= 3600.0;
							break;
						}
					}
					arg_return->delay = (int) num;
				} else {
					fprintf(stderr,
							"Argument Usage: --delay n[H|h|M|m]\n"
							"where n is a float number\n");
					success = FALSE;
				}
			}
			break;

			case RMD_ARG_DUMMY_CURSOR:
			{
				if (!strcmp(arg, "white"))
					arg_return->cursor_color = 0;
				else if (!strcmp(arg, "black"))
					arg_return->cursor_color = 1;
				else {
					fprintf(stderr,
							"Argument Usage:\n"
							" --dummy-cursor [black|white]\n");
					success = FALSE;
				}
				arg_return->have_dummy_cursor = TRUE;
				arg_return->xfixes_cursor = FALSE;
			}
			break;

			case RMD_ARG_USE_JACK:
			{
				if (arg && arg_return->jack_nports < RMD_MAX_JACK_PORTS) {
					/* since JACK port names seem to have no reserved chars, to
					 * specify multiple ports one must simply specify --use-jack
					 * for each port.
					 */
					arg_return->jack_port_names[arg_return->jack_nports] = strdup(arg);
					arg_return->jack_nports++;
					arg_return->use_jack = 1;
				} else {
					fprintf(stderr,
							"Argument Usage: --use-jack port1 [--use-jack port2]...\n");
					success = FALSE;
				}

				if (RMD_USE_JACK_EXTRA_FLAG == POPT_ARGFLAG_DOC_HIDDEN) {
					fprintf(stderr,
							"Warning, will ignore --use-jack flags, no libjack support in build.\n");
				}
			}

			default:
				break;
		}
	}

	if (arg_id == -1) {
		// Parsing is complete, perform final adjustments
		if (no_cursor)
			arg_return->xfixes_cursor = FALSE;

		if (quick_subsampling)
			arg_return->no_quick_subsample = FALSE;

		if (compress_cache)
			arg_return->zerocompression = FALSE;

		if (arg_return->follow_mouse)
			arg_return->full_shots = TRUE;

		if (!arg_return->filename)
			arg_return->filename = strdup(poptGetArg(popt_context));
	} else {
		// Parsing error, say what went wrong
		const char *str = poptBadOption(popt_context, 0);

		success = FALSE;

		fprintf(stderr,
				"Error when parsing `%s': ", str);

		switch (arg_id) {
			case POPT_ERROR_NOARG:
				fprintf(stderr, "Missing argument\n");
				break;

			case POPT_ERROR_BADNUMBER:
				fprintf(stderr, "Bad number\n");
				break;

			default:
				fprintf(stderr, "libpopt error: %d\n", arg_id);
				break;
		}
	}

	// Make sure argument ranges are valid
	success = success && rmdValidateArguments(arg_return);

	// Clean up
	poptFreeContext(popt_context);

	return success;
}

static boolean rmdValidateArguments(const ProgArgs *args)
{
	boolean success = TRUE;

	if (args->x < 0) {
		fprintf(stdout, "-x must not be less than 0.\n");
		success = FALSE;
	}
	if (args->y < 0) {
		fprintf(stdout, "-y must not be less than 0.\n");
		success = FALSE;
	}
	if (args->width < 0) {
		fprintf(stdout, "--width must be larger than 0.\n");
		success = FALSE;
	}
	if (args->height < 0) {
		fprintf(stdout, "--height must be larger than 0.\n");
		success = FALSE;
	}
	if (args->fps <= 0) {
		fprintf(stdout, "--fps must be larger than 0.\n");
		success = FALSE;
	}
	if (args->v_quality < 0 || args->v_quality > 63) {
		fprintf(stdout, "--v_quality must be within the inclusive range [0-63].\n");
		success = FALSE;
	}
	if (args->v_bitrate < 0 || args->v_quality > 2000000) {
		fprintf(stdout, "--v_bitrate must be within the inclusive range [0-2000000].\n");
		success = FALSE;
	}
	if (args->frequency <= 0) {
		fprintf(stdout, "--frequency must be larger than 0.\n");
		success = FALSE;
	}
	if (args->channels <= 0) {
		fprintf(stdout, "--channels must be larger than 0.\n");
		success = FALSE;
	}
	if (args->buffsize <= 0) {
		fprintf(stdout, "--buffer-size must be larger than 0.\n");
		success = FALSE;
	}
	if (args->jack_ringbuffer_secs <= 0) {
		fprintf(stdout, "--jack-buffer-size must be larger than 0.\n");
		success = FALSE;
	}

	return success;
}

static void rmdPrintAndExit(	poptContext con,
				enum poptCallbackReason reason,
				const struct poptOption *opt,
				const char *arg,
				const void *data)
{
	if (strcmp(opt->longName, "version") == 0) {
		fprintf(stderr, "recordMyDesktop v%s\n\n", VERSION);
	} else if (strcmp(opt->longName, "help") == 0) {
		poptPrintHelp(con, stdout, 0);
		fprintf(stdout,
				"\n"
				"\tIf no other options are specified, filename can be given without the -o switch.\n"
				"\n"
				"\n");
	} else if (strcmp(opt->longName, "print-config") == 0) {
		fprintf(stdout,
				"\n"
				"recordMyDesktop was compiled with the following options:\n"
				"\n"
				"Jack:\t\t\t" RMD_LIBJACK_STATUS "\n"
				"Default Audio Backend:\t" RMD_LIBASOUND_STATUS "\n"
				"\n"
				"\n");
	}

	exit(0);
}