/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Trivial application to control playback of a sound file
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */

/*** MODULEINFO
	<support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/pbx.h"
#include "asterisk/app.h"
#include "asterisk/module.h"
#include "asterisk/manager.h"
#include "asterisk/utils.h"
#include "asterisk/astobj2.h"

/*** DOCUMENTATION
	<application name="ControlPlayback" language="en_US">
		<synopsis>
			Play a file with fast forward and rewind.
		</synopsis>
		<syntax>
			<parameter name="filename" required="true" />
			<parameter name="skipms">
				<para>This is number of milliseconds to skip when rewinding or
				fast-forwarding.</para>
			</parameter>
			<parameter name="ff">
				<para>Fast-forward when this DTMF digit is received. (defaults to <literal>#</literal>)</para>
			</parameter>
			<parameter name="rew">
				<para>Rewind when this DTMF digit is received. (defaults to <literal>*</literal>)</para>
			</parameter>
			<parameter name="stop">
				<para>Stop playback when this DTMF digit is received.</para>
			</parameter>
			<parameter name="pause">
				<para>Pause playback when this DTMF digit is received.</para>
			</parameter>
			<parameter name="restart">
				<para>Restart playback when this DTMF digit is received.</para>
			</parameter>
			<parameter name="options">
				<optionlist>
					<option name="o">
						<argument name="time" required="true">
							<para>Start at <replaceable>time</replaceable> ms from the
							beginning of the file.</para>
						</argument>
					</option>
				</optionlist>
			</parameter>
		</syntax>
		<description>
			<para>This application will play back the given <replaceable>filename</replaceable>.</para>
			<para>It sets the following channel variables upon completion:</para>
			<variablelist>
				<variable name="CPLAYBACKSTATUS">
					<para>Contains the status of the attempt as a text string</para>
					<value name="SUCCESS" />
					<value name="USERSTOPPED" />
					<value name="REMOTESTOPPED" />
					<value name="ERROR" />
				</variable>
				<variable name="CPLAYBACKOFFSET">
					<para>Contains the offset in ms into the file where playback
					was at when it stopped. <literal>-1</literal> is end of file.</para>
				</variable>
				<variable name="CPLAYBACKSTOPKEY">
					<para>If the playback is stopped by the user this variable contains
					the key that was pressed.</para>
				</variable>
			</variablelist>
		</description>
	</application>
	<manager name="ControlPlayback" language="en_US">
		<synopsis>
			Control the playback of a file being played to a channel.
		</synopsis>
		<syntax>
			<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
			<parameter name="Channel" required="true">
				<para>The name of the channel that currently has a file being played back to it.</para>
			</parameter>
			<parameter name="Control" required="true">
				<enumlist>
					<enum  name="stop">
						<para>Stop the playback operation.</para>
					</enum>
					<enum name="forward">
						<para>Move the current position in the media forward. The amount
						of time that the stream moves forward is determined by the
						<replaceable>skipms</replaceable> value passed to the application
						that initiated the playback.</para>
						<note>
							<para>The default skipms value is <literal>3000</literal> ms.</para>
						</note>
					</enum>
					<enum name="reverse">
						<para>Move the current position in the media backward. The amount
						of time that the stream moves backward is determined by the
						<replaceable>skipms</replaceable> value passed to the application
						that initiated the playback.</para>
						<note>
							<para>The default skipms value is <literal>3000</literal> ms.</para>
						</note>
					</enum>
					<enum name="pause">
						<para>Pause/unpause the playback operation, if supported.
						If not supported, stop the playback.</para>
					</enum>
					<enum name="restart">
						<para>Restart the playback operation, if supported.
						If not supported, stop the playback.</para>
					</enum>
				</enumlist>
			</parameter>
		</syntax>
		<description>
			<para>Control the operation of a media file being played back to a channel.
			Note that this AMI action does not initiate playback of media to channel, but
			rather controls the operation of a media operation that was already initiated
			on the channel.</para>
			<note>
				<para>The <literal>pause</literal> and <literal>restart</literal>
				<replaceable>Control</replaceable> options will stop a playback
				operation if that operation was not initiated from the
				<replaceable>ControlPlayback</replaceable> application or the
				<replaceable>control stream file</replaceable> AGI command.</para>
			</note>
		</description>
		<see-also>
			<ref type="application">Playback</ref>
			<ref type="application">ControlPlayback</ref>
			<ref type="agi">stream file</ref>
			<ref type="agi">control stream file</ref>
		</see-also>
	</manager>
 ***/
static const char app[] = "ControlPlayback";

enum {
	OPT_OFFSET = (1 << 1),
};

enum {
	OPT_ARG_OFFSET = 0,
	/* must stay as the last entry ... */
	OPT_ARG_ARRAY_LEN,
};

AST_APP_OPTIONS(cpb_opts, BEGIN_OPTIONS
	AST_APP_OPTION_ARG('o', OPT_OFFSET, OPT_ARG_OFFSET),
	END_OPTIONS
);

static int is_on_phonepad(char key)
{
	return key == 35 || key == 42 || (key >= 48 && key <= 57);
}

static int is_argument(const char *haystack, int needle)
{
	if (ast_strlen_zero(haystack))
		return 0;

	if (strchr(haystack, needle))
		return -1;

	return 0;
}

static int controlplayback_exec(struct ast_channel *chan, const char *data)
{
	int res = 0;
	int skipms = 0;
	long offsetms = 0;
	char offsetbuf[20];
	char stopkeybuf[2];
	char *tmp;
	struct ast_flags opts = { 0, };
	char *opt_args[OPT_ARG_ARRAY_LEN];
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(filename);
		AST_APP_ARG(skip);
		AST_APP_ARG(fwd);
		AST_APP_ARG(rev);
		AST_APP_ARG(stop);
		AST_APP_ARG(pause);
		AST_APP_ARG(restart);
		AST_APP_ARG(options);
	);

	if (ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "ControlPlayback requires an argument (filename)\n");
		return -1;
	}

	tmp = ast_strdupa(data);
	AST_STANDARD_APP_ARGS(args, tmp);

	if (args.argc < 1) {
		ast_log(LOG_WARNING, "ControlPlayback requires an argument (filename)\n");
		return -1;
	}

	skipms = args.skip ? (atoi(args.skip) ? atoi(args.skip) : 3000) : 3000;

	if (!args.fwd || !is_on_phonepad(*args.fwd)) {
		char *digit = "#";
		if (!is_argument(args.rev, *digit) && !is_argument(args.stop, *digit) && !is_argument(args.pause, *digit) && !is_argument(args.restart, *digit))
			args.fwd = digit;
		else
			args.fwd = NULL;
	}
	if (!args.rev || !is_on_phonepad(*args.rev)) {
		char *digit = "*";
		if (!is_argument(args.fwd, *digit) && !is_argument(args.stop, *digit) && !is_argument(args.pause, *digit) && !is_argument(args.restart, *digit))
			args.rev = digit;
		else
			args.rev = NULL;
	}
	ast_debug(1, "Forward key = %s, Rewind key = %s\n", args.fwd, args.rev);
	if (args.stop && !is_on_phonepad(*args.stop))
		args.stop = NULL;
	if (args.pause && !is_on_phonepad(*args.pause))
		args.pause = NULL;
	if (args.restart && !is_on_phonepad(*args.restart))
		args.restart = NULL;

	if (args.options) {
		ast_app_parse_options(cpb_opts, &opts, opt_args, args.options);
		if (ast_test_flag(&opts, OPT_OFFSET))
			offsetms = atol(opt_args[OPT_ARG_OFFSET]);
	}

	res = ast_control_streamfile(chan, args.filename, args.fwd, args.rev, args.stop, args.pause, args.restart, skipms, &offsetms);

	/* If we stopped on one of our stop keys, return 0  */
	if (res > 0 && args.stop && strchr(args.stop, res)) {
		pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "USERSTOPPED");
		snprintf(stopkeybuf, sizeof(stopkeybuf), "%c", res);
		pbx_builtin_setvar_helper(chan, "CPLAYBACKSTOPKEY", stopkeybuf);
		res = 0;
	} else if (res > 0 && res == AST_CONTROL_STREAM_STOP) {
		pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "REMOTESTOPPED");
		res = 0;
	} else {
		if (res < 0) {
			res = 0;
			pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "ERROR");
		} else
			pbx_builtin_setvar_helper(chan, "CPLAYBACKSTATUS", "SUCCESS");
	}

	snprintf(offsetbuf, sizeof(offsetbuf), "%ld", offsetms);
	pbx_builtin_setvar_helper(chan, "CPLAYBACKOFFSET", offsetbuf);

	return res;
}

static int controlplayback_manager(struct mansession *s, const struct message *m)
{
	const char *channel_name = astman_get_header(m, "Channel");
	const char *control_type = astman_get_header(m, "Control");
	struct ast_channel *chan;

	if (ast_strlen_zero(channel_name)) {
		astman_send_error(s, m, "Channel not specified");
		return 0;
	}

	if (ast_strlen_zero(control_type)) {
		astman_send_error(s, m, "Control not specified");
		return 0;
	}

	chan = ast_channel_get_by_name(channel_name);
	if (!chan) {
		astman_send_error(s, m, "No such channel");
		return 0;
	}

	if (!strcasecmp(control_type, "stop")) {
		ast_queue_control(chan, AST_CONTROL_STREAM_STOP);
	} else if (!strcasecmp(control_type, "forward")) {
		ast_queue_control(chan, AST_CONTROL_STREAM_FORWARD);
	} else if (!strcasecmp(control_type, "reverse")) {
		ast_queue_control(chan, AST_CONTROL_STREAM_REVERSE);
	} else if (!strcasecmp(control_type, "pause")) {
		ast_queue_control(chan, AST_CONTROL_STREAM_SUSPEND);
	} else if (!strcasecmp(control_type, "restart")) {
		ast_queue_control(chan, AST_CONTROL_STREAM_RESTART);
	} else {
		astman_send_error(s, m, "Unknown control type");
		chan = ast_channel_unref(chan);
		return 0;
	}

	chan = ast_channel_unref(chan);
	astman_send_ack(s, m, NULL);
	return 0;
}

static int unload_module(void)
{
	int res = 0;

	res |= ast_unregister_application(app);
	res |= ast_manager_unregister("ControlPlayback");

	return res;
}

static int load_module(void)
{
	int res = 0;

	res |= ast_register_application_xml(app, controlplayback_exec);
	res |= ast_manager_register_xml("ControlPlayback", EVENT_FLAG_CALL, controlplayback_manager);

	return res;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Control Playback Application");