#!/bin/bash
#
# Function use in preparation & configuration
#    Copyright (C) 2017  AleaJactaEst
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.

######################
# Write output
######################
declare -i DEBUG=0

function msg_debug()
{
   if [[ $DEBUG -ne 0 ]]
   then
      echo "$(date "+%Y/%m/%d %H:%M:%S") DEBUG - $*"
   fi
}

function msg_info()
{
   echo "$(date "+%Y/%m/%d %H:%M:%S") INFO - $*"
}

function msg_error()
{
   echo "$(date "+%Y/%m/%d %H:%M:%S") ERROR - $*" >&2
}

function msg_critical()
{
   echo "$(date "+%Y/%m/%d %H:%M:%S") CRITICAL - $*" >&2
   exit 2
}

function set_debug()
{
  if [[ -n "$1" ]]
  then
    DEBUG=$1
  else
    DEBUG=0
  fi
}

######################
# function to change owner for gameserver
######################
function chown_gameserver()
{
  # gameserver:$(id -g -n gameserver)
  chown $UIDGAMESERVER:$GIDGAMESERVER "$1" || exit 2
}

######################
# function duplicate/link file
######################
function copy_link()
{
  if [[ -z "$1" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi

  if [ ! -f "$1" ]
  then
    msg_error "[$(basename $0):$LINENO] Missing source : '$1'"
    exit 2
  fi
  mv "$1" "$1.old" || exit 2
  cp "$1.old" "$1" || exit 2
  chown_gameserver "$1" || exit 2
}

function create_link()
{
  if [[ -z "$1" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi
  if [[ -z "$2" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 2nd argument (destination)"
    exit 2
  fi

  filename_l=$(basename "$1")

  msg_debug "[$(basename $0):$LINENO] create link $2/$filename_l"
  if [ -e "$2/$filename_l" ]
  then
    rm "$2/$filename_l" || exit 2
  elif [ -h "$2/$filename_l" ]
  then
    rm "$2/$filename_l" || exit 2
  fi
  if [[ (! -e "$1") && (! -h "$1") ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing source : '$1'"
    exit 2
  fi
  ln -s "$1" "$2/$filename_l" || exit 2
  chown --no-dereference $UIDGAMESERVER:$GIDGAMESERVER "$2/$filename_l" || exit 2
}

function create_recursive_link()
{
  if [[ -z "$1" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi
  if [[ -z "$2" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 2nd argument (destination)"
    exit 2
  fi

  msg_debug "[$(basename $0):$LINENO] link $1 -> $2"
  for file in $1/*
  do
    if [ -d "$file" ]
    then
      filename=$(basename "$file")
      msg_debug "[$(basename $0):$LINENO] create dir $2/$filename"
      if [ ! -f "$2/$filename" ]
      then
        mkdir -p "$2/$filename" || exit 2
      fi
      chown $UIDGAMESERVER:$GIDGAMESERVER "$2/$filename" || exit 2
      create_recursive_link "$file" "$2/$filename" || exit 2
    else
      create_link "$file" "$2" || exit 2
    fi
  done
}

function create_link_2nd_level()
{
  # Function to create link
  if [[ -z "$1" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi
  if [[ -z "$2" ]]
  then
    msg_error "[$(basename $0):$LINENO] Missing 2nd argument (destination)"
    exit 2
  fi

  for file in $1
  do
    create_link "$file" "$2" || exit 2
  done
}

function create_dir_gameserver()
{
  if [ -z "$1" ]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi
  mkdir -p "$1" || exit 2
  chown $UIDGAMESERVER:$GIDGAMESERVER "$1" || exit 2
}

function create_file_gameserver()
{
  if [ -z "$1" ]
  then
    msg_error "[$(basename $0):$LINENO] Missing 1st argument (source)"
    exit 2
  fi
  touch "$1" || exit 2
  chown $UIDGAMESERVER:$GIDGAMESERVER "$1" || exit 2
}

######################
### Manage multi process
######################
declare -A JOBS
declare -A COMMENTJOBS

function init_job()
{
  unset JOBS
  unset COMMENTJOBS
}

function launch_job()
{
  msg_debug "[$(basename $0):$LINENO] Launch job '$2'"
  eval $1 &
  JOBS[$!]="$1"
  COMMENTJOBS[$!]="$2"
}

function wait_all_job()
{
  local cmd
  local code=0
  for pid in ${!JOBS[@]}
  do
    msg_debug "[$(basename $0):$LINENO] Wait job '${COMMENTJOBS[$pid]}' (pid:$pid) "
    cmd=${JOBS[${pid}]}
    wait ${pid}
    JOBS[${pid}]=$?
    if [[ ${JOBS[${pid}]} -ne 0 ]]
    then
      code=${JOBS[${pid}]}
      msg_error "[$(basename $0):$LINENO] '${COMMENTJOBS[$pid]}' Exited with error [return code:$code, pid:${pid}, command:'${cmd}']"
    fi
  done
  return $code
}

######################
# Debian information
######################
function get_debian_info()
{
   cat /etc/debian_version
}

function get_debian_version()
{
   local DEBIAN_INFO=$(get_debian_info)
   echo ${DEBIAN_INFO%%.*}
}

function get_debian_release()
{
   local DEBIAN_INFO=$(get_debian_info)
   echo ${DEBIAN_INFO#*.}
}

######################
#
######################