#!/bin/sh
#
# koha-list -- List all Koha instances.
# Copyright 2010  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

die()
{
    echo "$@" 1>&2
    exit 1
}

is_enabled()
{
    local instancename=$1

    if grep '^[[:space:]]*Include /etc/koha/apache-shared-disable.conf' \
            "/etc/apache2/sites-available/$instancename" > /dev/null
    then
        return 1
    else
        return 0
    fi
}

is_email_enabled()
{
    local instancename=$1

    if [ -e /var/lib/koha/$instancename/email.enabled ]; then
        return 0
    else
        return 1
    fi
}

get_instances()
{
    find /etc/koha/sites -mindepth 1 -maxdepth 1\
                         -type d -printf '%f\n' | sort
}

show_instances()
{
    local show=$1
    local show_email=$2

    for instance in $( get_instances ); do
        case $show in
          "all")
              show_instance_filter_email $instance $show_email;;
          "enabled")
              if is_enabled $instance; then
                  show_instance_filter_email $instance $show_email
              fi ;;
          "disabled")
              if ! is_enabled $instance; then
                  show_instance_filter_email $instance $show_email
              fi ;;
        esac
    done
}

show_instance_filter_email()
{
    local instancename=$1
    local show_email=$2;

    case $show_email in
        "all")
            echo $instancename ;;
        "enabled")
            if is_email_enabled $instancename; then
                echo $instancename
            fi ;;
        "disabled")
            if ! is_email_enabled $instancename; then
                echo $instancename
            fi ;;
    esac
}

set_show()
{
    local show_param=$1

    if [ "$show" = "all" ]; then
        show=$show_param
    else
        die "Error: --enabled and --disabled are mutually exclusive."
    fi
}

set_show_email()
{
    local email_param=$1

    if [ "$show_email" = "all" ]; then
        show_email=$email_param
    else
        die "Error: --email and --noemail are mutually exclusive."
    fi
}

usage()
{
    local scriptname=$0

    echo <<eoh
Lists Koha instances, optionally only those that are enabled or have
email turned on.
    
Usage: $scriptname [--enabled|--disabled] [--email|--noemail] [-h]
Options:
    --enabled       only show instances that are enabled
    --disabled      only show instances that are disabled
    --email         only show instances that have email enabled
    --noemail       only show instances that do not have email enabled
    -h              this help

The filtering options can be combined, and you probably want to do this
(except --email and --noemail, or --enabled and --disabled, that's just silly.)
eoh
}

show="all"
show_email="all"

args=$(getopt -l enabled,disabled,email,noemail -o h -n $0 -- "$@")
set -- $args

while [ ! -z "$1" ]
do
    case "$1" in
         -h) usage; exit;;
    --email) set_show_email "enabled" ;;
  --noemail) set_show_email "disabled" ;;
  --enabled) set_show "enabled" ;;
 --disabled) set_show "disabled" ;;
          *) break;;
    esac
    shift
done

show_instances $show $show_email

exit 0