#!/bin/bash

# koha-sip - Manage SIP server for Koha instances
#              Copyright 2019 Theke Solutions
#              Copyright 2012 Catalyst IT, Ltd
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

set -e

. /lib/lsb/init-functions

# Read configuration variable file if it is present
[ -r /etc/default/koha-common ] && . /etc/default/koha-common

# include helper functions
if [ -f "/usr/share/koha/bin/koha-functions.sh" ]; then
    . "/usr/share/koha/bin/koha-functions.sh"
else
    echo "Error: /usr/share/koha/bin/koha-functions.sh not present." 1>&2
    exit 1
fi

usage()
{
    local scriptname=$(basename $0)

    cat <<EOF
$scriptname

This script lets you manage the SIP server for your Koha instances.

Usage:
$scriptname [--start|--stop|--restart] instancename1 [instancename2...]
$scriptname -h|--help

    --enable              Enable the Koha SIP server.
    --disable             Disable and stop the Koha SIP server.
    --start               Start the SIP server for the specified instance(s)
    --stop                Stop the SIP server for the specified instance(s)
    --restart             Restart the SIP server for the specified instance(s)
    --status              Show the status of the SIP server for the specified instance(s)
    --verbose|-v          Display progress and actions messages
    --help|-h             Display this help message

EOF
}

start_sip()
{
    local name=$1

    _check_and_fix_perms $name

    if ! is_sip_running $name; then
        if [ ! -f "/etc/koha/sites/${name}/SIPconfig.xml" ] || [ ! -f "/var/lib/koha/${name}/sip.enabled" ] ; then
            echo "SIP is disabled, or you do not have a SIPconfig.xml file."
        else
            adjust_paths_dev_install $name
            export KOHA_HOME PERL5LIB

            if [ "$DEV_INSTALL" = "" ]; then
                LIBDIR=$KOHA_HOME/lib
            else
                LIBDIR=$KOHA_HOME
            fi

            DAEMONOPTS="--name=${name}-koha-sip \
                    --errlog=/var/log/koha/${name}/sip-error.log \
                    --stdout=/var/log/koha/${name}/sip.log \
                    --output=/var/log/koha/${name}/sip-output.log \
                    --verbose=1 \
                    --respawn \
                    --delay=30 \
                    --pidfiles=/var/run/koha/${name} \
                    --user=${name}-koha.${name}-koha"

            SIP_PARAMS="$LIBDIR/C4/SIP/SIPServer.pm \
                    /etc/koha/sites/${name}/SIPconfig.xml"

            [ "$verbose" != "no" ] && \
                log_daemon_msg "Starting SIP server for ${name}"

            if daemon $DAEMONOPTS -- perl $SIP_PARAMS; then
                ([ "$verbose" != "no" ] && \
                    log_end_msg 0) || return 0
            else
                ([ "$verbose" != "no" ] && \
                    log_end_msg 1) || return 1
            fi
        fi
    else
        if [ "$verbose" != "no" ]; then
            log_daemon_msg "Warning: SIP server already running for ${name}"
            log_end_msg 0
        else
            return 0
        fi
    fi
}

stop_sip()
{
    local name=$1

    if is_sip_running $name; then

        DAEMONOPTS="--name=${name}-koha-sip \
                    --errlog=/var/log/koha/${name}/sip-error.log \
                    --stdout=/var/log/koha/${name}/sip.log \
                    --output=/var/log/koha/${name}/sip-output.log \
                    --verbose=1 \
                    --respawn \
                    --delay=30 \
                    --pidfiles=/var/run/koha/${name} \
                    --user=${name}-koha.${name}-koha"

        [ "$verbose" != "no" ] && \
            log_daemon_msg "Stopping SIP server for ${name}"

        if daemon $DAEMONOPTS --stop; then
            ([ "$verbose" != "no" ] && \
                log_end_msg 0) || return 0
        else
            ([ "$verbose" != "no" ] && \
                log_end_msg 1) || return 1
        fi
    else
        if [ "$verbose" != "no" ]; then
            log_daemon_msg "Warning: SIP server not running for ${name}"
            log_end_msg 0
        else
            return 0
        fi
    fi
}

restart_sip()
{
    local name=$1

    if is_sip_running ${name}; then
        local noLF="-n"
        [ "$verbose" != "no" ] && noLF=""
        echo $noLF `stop_sip ${name}`

        MAX_ITERATION=10
        while is_sip_running ${name}; do
            i=$((i+1))
            if [ $MAX_ITERATION -lt $i ]; then
                break
            fi
            sleep 1;

        done
        echo $noLF `start_sip ${name}`
    else
        if [ "$verbose" != "no" ]; then
            log_warning_msg "Warning: SIP server not running for ${name}."
            start_sip ${name}
        else
            start_sip ${name}
            return 0
        fi
    fi
}

sip_status()
{
    local name=$1

    if is_sip_running ${name}; then
        log_daemon_msg "SIP server running for ${name}"
        log_end_msg 0
    else
        log_daemon_msg "SIP server not running for ${name}"
        log_end_msg 3
    fi
}

enable_sip()
{
    local name=$1
    local libdir=/var/lib/koha/${name}

    sipfile=/etc/koha/sites/${name}/SIPconfig.xml

    if is_sip_enabled ${name}; then
        echo "Warning: SIP server already enabled for ${name}"
    else
        echo "Enabling SIP server for ${name} - edit ${sipfile} to configure"
        touch $libdir/sip.enabled
        if [[ ! -f "/etc/koha/sites/${name}/SIPconfig.xml" ]]; then
            cp -v /etc/koha/SIPconfig.xml ${sipfile}
            chown ${name}-koha:${name}-koha ${sipfile}
            chmod 600 ${sipfile}
            echo "This is the first time SIP has been enabled. Please check the configurations in /etc/koha/sites/${name}/SIPconfig.xml"
        fi
    fi
}

disable_sip()
{
    local name=$1
    local libdir=/var/lib/koha/${name}

    if is_sip_enabled ${name}; then
        # SIP is enabled, we should disable it
        echo "Stopping running SIP"
        stop_sip ${name}
        rm ${libdir}/sip.enabled
        echo "Information: SIP server disabled for ${name}"
    else
        echo " SIP server for ${name} not enabled - use koha-sip --enable <instance> to enable."
    fi
}


_check_and_fix_perms()
{
    local name=$1

    local files="/var/log/koha/${name}/sip-error.log \
                 /var/log/koha/${name}/sip.log \
                 /var/log/koha/$name/sip-output.log"

    for file in ${files}
    do
        if [ ! -e "${file}" ]; then
            touch ${file}
        fi
        chown "${name}-koha":"${name}-koha" ${file}
    done
}

set_action()
{
    if [ "$op" = "" ]; then
        op=$1
    else
        die "Error: only one action can be specified."
    fi
}

op=""
verbose="no"

# Backwards compatible with old koha-*-sip scripts
# TODO: Remove once there's consensus to remove the legacy scripts
used_script_name=$(basename $0)

if [ "$used_script_name" != "koha-sip" ]; then
    warn "Deprecated script used (${used_script_name})"

    case "$used_script_name" in
        koha-start-sip)
            set_action "start" ;;
        koha-stop-sip)
            set_action "stop" ;;
        koha-enable-sip)
            set_action "enable" ;;
        *)
            break ;;
    esac
fi
# / Backwards compatible handling code

# Read command line parameters
while [ $# -gt 0 ]; do

    case "$1" in
        -h|--help)
            usage ; exit 0 ;;
        -v|--verbose)
            verbose="yes"
            shift ;;
        --start)
            set_action "start"
            shift ;;
        --stop)
            set_action "stop"
            shift ;;
        --restart)
            set_action "restart"
            shift ;;
        --status)
            set_action "status"
            shift ;;
        --enable)
            set_action "enable"
            shift ;;
        --disable)
            set_action "disable"
            shift ;;
        -*)
            die "Error: invalid option switch ($1)" ;;
        *)
            # We expect the remaining stuff are the instance names
            break ;;
    esac

done

if [ $# -gt 0 ]; then
    # We have at least one instance name
    for name in "$@"; do

        if is_instance $name; then

            export KOHA_CONF="/etc/koha/sites/$name/koha-conf.xml"

            case $op in
                "start")
                    start_sip $name
                    ;;
                "stop")
                    stop_sip $name
                    ;;
                "restart")
                    restart_sip $name
                    ;;
                "status")
                    sip_status $name
                    ;;
                "enable")
                    enable_sip $name
                    ;;
                "disable")
                    disable_sip $name
            esac

        else
            if [ "$verbose" != "no" ]; then
                log_daemon_msg "Error: Invalid instance name $name"
                log_end_msg 1
            fi
        fi

    done
else
    if [ "$verbose" != "no" ]; then
        warn "Error: you must provide at least one instance name"
    fi
fi

exit 0