#!/bin/sh

set -e

vardir=/var/lib/kannel/hello
sbindir=/usr/local/sbin

exit0() {
	[ -n "$1" ] && echo "$1"
	exit 0
}
exit1() {
	response="${1:+Error: }${1:-Internal error!}"
# FIXME: pass error messages via stderr (not stdout)
#	echo >&2 "$response"
	echo "$response"
	[ -z "$SMS_SMSC$SMS_URL" ] || $sbindir/localsendsms "$to" "$response"
	exit 1
}

simpleword() {
#	echo "$1" | tr '[A-Z]' '[a-z]' | egrep '^[a-z][a-z0-9-]+$' || exit 1
	echo "$1" | tr '[A-Z]' '[a-z]' | egrep '^[a-zæøåÆØÅ!@/][a-zæøåÆØÅ0-9-]+$' || exit 1
}

uriunescape() {
	if [ 0 = "$urldecode" ]; then
		echo "$@"
	else
		echo "$@" | perl -e 'use URI::Escape; print lc(uri_unescape(<STDIN>));'
	fi
}

lastservicephone() {
	logfile=/var/log/kannel/smsbox.log
	tac $logfile $logfile.1 \
		| perl -ne "/INFO: Starting to service <.*> from <\+$1> to <([^<>]*)>/ and print \$1 and exit 0"
}

#from=`uriunescape "$1" | sed -e 's/\+/ /g'`; shift
from=`uriunescape "$1"`; shift
#to=`uriunescape "$1" | sed -e 's/\+/ /g'`; shift
to=`uriunescape "$1"`; shift
set -- `uriunescape "$@" | sed -e 's/\+/ /g'`
#set -- `uriunescape "$@"`
app_raw="$1"
app=`simpleword "$1"`; shift

export debug

SMS_PHONE="$from"
urldecode=0
export SMS_PHONE urldecode

case "$SMS_REALM" in
  test)
	provider="dummy"
	mdpath="/home/hearth/public_webdata/hearth/content/sms"
	export mdpath
	;;
  hello)
	provider="local"
#	provider="coolsms"
#	provider="clickatell"
	mdpath="/home/hearth/public_webdata/hearth/content/sms"
	export mdpath
	;;
  hellobudapest)
	provider="clickatell"
	mdpath="/home/www-hearth/public_webdata/hellobudapest/content/sms"
	export mdpath
	;;
  hellotorino)
	provider="clickatell"
	mdpath="/home/www-hearth/public_webdata/hellotorino/content/sms"
	export mdpath
	;;
  cyber)
	provider="local"
	mdpath="/home/cyberhus/public_webdata/mdsms/content/sms"
	export mdpath
	;;
  *)
	exit1 "unknown realm \"$SMS_REALM\"!"
	;;
esac
case "$provider" in
  dummy)
	dummy=1
	ADMIN_OK=1
	export ADMIN_OK dummy
	;;
  local)
	export SMS_SMSC
	;;
  coolsms)
	unset SMS_SMSC
	SMS_URL="https://sms.coolsmsc.dk:8081/"
	SMS_USER="drjones1"
	SMS_PW="rahYSeGY"
	SMS_CP="cp1252"
	SMS_MSGTAG="message"
	export SMS_URL SMS_USER SMS_PW SMS_CP SMS_MSGTAG
	;;
  # supports concatenation and req_feat (e.g 48: sender ID)
  # does not support DLR, and only concatenates max. 3 smses
  clickatell)
	unset SMS_SMSC
	SMS_URL="https://api.clickatell.com/http/sendmsg"
	SMS_USER="jonas"
	SMS_PW="inaritab6"
	SMS_CP="iso8859-1"
	SMS_USERTAG="user"
	SMS_API="3231280"
	SMS_CONCAT="3"
	SMS_ESCALATE="1"
	SMS_VALIDITY="1"
	SMS_REQ_FEAT="24611" # 1+2+32+8192+16384 = text+8bit+numeric_src+dlr+concat
	stripprefix="1"
	export SMS_URL SMS_USER SMS_PW SMS_CP SMS_USERTAG SMS_API SMS_CONCAT SMS_ESCALATE SMS_VALIDITY SMS_REQ_FEAT stripprefix
	;;
  # supports DLR
  # Kannel clickatell profile supports concatenation but not req_feat
  # Kannel generic profile supports req_feat but not concatenation
  clickatell_via_kannel)
	SMS_SMSC="X"
	SMS_CONCATENATION="1"
	SMS_DLR_MASK="7"
	SMS_DLR_URL="http://helloearth.jones.dk/test.cgi?type=dlr&msgid=XXX&smsid=%I&from=%p&to=%P&time=%t&unixtime=%T&dlr=%d&dlrmsg=%A"
	SMS_CP="iso8859-1"
	SMS_VALIDITY="1"
	SMS_BINFO="req_feat=24611&concat=3&escalate=1%validity=1" # 1+2+32+8192+16384 = text+8bit+numeric_src+dlr+concat
	stripprefix="1"
	export SMS_SMSC SMS_CONCATENATION SMS_DLR_MASK SMS_DLR_URL SMS_CP SMS_VALIDITY SMS_BINFO stripprefix
	;;
  routo_via_kannel)
	SMS_SMSC="Y"
	export SMS_SMSC
	;;
  *)
	exit1 "unknown provider \"$provider\"!"
	;;
esac

# FIXME: some safety net against abusing this imposter feature
#if [ -n "$REDIRECT_OK" ]; then
case "$app" in
  @*)
# FIXME: Avoid hardcoding national prefix
	targetphone="$(echo "$app" | perl -pe 's/^@//;' -e 's/^([^+])/+39\1/')"
# TODO: silence errors - or better: bounce those back to original sender
	targetfrom=$(lastservicephone "$targetphone")
	[ -n "$targetfrom" ] || exit1 "refusing to redirect: unknown target phone number \"$targetphone\"."
	SMS_PHONE="$targetfrom" $sbindir/localmarkdown2sms "$targetphone" "$@"
	exit 0
	;;
esac
#fi

if [ -n "$GROUP_OK" ]; then
case "$app" in
  !*)
	group="$(echo "$app" | perl -pe 's/^!//;')"
	members=$(cd "$vardir/user" && grep -lF "$group" */group | perl -pe "s,/group$,,") || members=
	[ -n "$members" ] || exit1 "Message redirected for none: no members resolved in group \"$group\"!"
	for member in $members; do
		phone=$(head -n 1 "$vardir/user/$member/phone") || nophone="${nophone+$nophone }$member"
		[ -z "$phone" ] || $sbindir/localmarkdown2sms "$phone" "$@"
	done
	[ -n "$members" ] || exit1 "Message redirected for none: no members resolved in group \"$group\"!"
	membercount=$(echo "$members" | wc --word)
	[ -z "$nophone" ] || nophonecount=$(echo "$nophone" | wc --word)
	[ -z "$nophone" ] || exit1 "Message redirected for $membercount members of group \"$group\", but failed for $nophonecount of them (could not resolve phone number)!"
	exit0 "Message redirected for $membercount members of group \"$group\"."
	;;
esac
fi

case "$app" in
  /*)
	cmd="$(echo "$app" | perl -pe 's/^\///;')"
	case "$cmd" in
	  ping)
		if [ "help" = "$1" ]; then
			$sbindir/localsendsms "$to" "Usage:
/ping [...]

Respond \"pong\" and echo back any addition input."
			exit 0
		fi
		$sbindir/localsendsms "$to" pong "$@"
		exit 0
		;;
# FIXME: generalize this ugly hacks somehow, and secure against random use
	  go|gotest|so|sotest)
		case "$cmd" in
		  go*)
			realcmd="go"
			;;
		  so*)
			realcmd="so"
			;;
		esac
		if [ "help" = "$1" ]; then
			$sbindir/localsendsms "$to" "Usage:
/$realcmd PHONE MSG...
/${realcmd}test PHONE MSG...
/$realcmd help

Send \"[$cmd] MSG...\" to ${realcmd}test subscribers,
and start thread \"$realcmd\" on behalf of PHONE."
			exit 0
		fi
		[ -n "$1" ] || exit1 "phone number missing (try \"/$cmd help\" for usage)"
		[ -n "$2" ] || exit1 "message missing (try \"/$cmd help\" for usage)"
		case "$cmd" in
		  gotest|sotest)
			info1phone="+393453915741" # Jonas
			info2phone="+393453805531" # Jacob
			info3phone="+393453801457" # Vera
			;;
		  go|so)
			info1phone="+393407574815" # Alessandra
			info2phone="+393407574813" # Vela
			info3phone=
			;;
		esac
		targetphone="$(echo "$1" | perl -pe 's/^@//;' -e 's/^([^+])/+39\1/')"; shift

		# Sanity check + set sender number
		info1from=$(lastservicephone "$info1phone")
		[ -n "$info1from" ] || exit1 "refusing to redirect: unknown info phone number \"$info1phone\"."
		info2from=$(lastservicephone "$info2phone")
		[ -n "$info2from" ] || exit1 "refusing to redirect: unknown info phone number \"$info2phone\"."
		if [ -n "$info3phone" ]; then
			info3from=$(lastservicephone "$info3phone")
			[ -n "$info3from" ] || exit1 "refusing to redirect: unknown info phone number \"$info3phone\"."
		fi
		targetfrom=$(lastservicephone "$targetphone")
		[ -n "$targetfrom" ] || exit1 "refusing to redirect: unknown target phone number \"$targetphone\"."

		# send responses (threaded one last, to work in debug mode)
		SMS_PHONE="$info1from" $sbindir/localsendsms "$info1phone" "[$cmd] $@"
		SMS_PHONE="$info2from" $sbindir/localsendsms "$info2phone" "[$cmd] $@"
		if [ -n "$info3phone" ]; then
			SMS_PHONE="$info3from" $sbindir/localsendsms "$info2phone" "[$cmd] $@"
		fi
		SMS_PHONE="$targetfrom" $sbindir/localmarkdown2sms "$targetphone" "/$realcmd"
		exit 0
		;;
	esac
	candidates=$(cd "$vardir/user" && grep -lF "$to" */phone | perl -pe "s,/phone$,,") || candidates=
	[ -z "$candidates" ] || $(grep -vqF "$candidates" "$vardir/group/admin/user") || admin=true
	if [ -n "$ADMIN_OK" ] && [ -n "$admin" ]; then
		str="$($sbindir/localsmsadmin "$cmd" "$@" 2>&1)" || exit1 "$str"
		$sbindir/localsendsms "$to" $str
		exit 0
	elif [ "help" = "$cmd" ]; then
		$sbindir/localsendsms "$to" "Commands:
/ping [...]
/COMMAND help
/help

try e.g. \"/del help\"."
		exit 0
	fi
	;;
esac

#FIXME: if sender has a mission, check for "done": process missionpending and report result to mission members

#  yb)
#	s="$(links -dump "http://www.yubnub.org/parser/parse?command=$@")"
#	$sbindir/localsendsms "$to" "$s"
#	exit 0
#	;;

$sbindir/localmarkdown2sms "$to" "$app_raw" "$@"