#!/usr/bin/bash

wallDir=/media/Wall

cmd='nitrogen --set-zoom-fill %s'

if [ -n "$WAYLAND_DISPLAY" ] ; then
  cmd='swaymsg output "*" background %s fill'
fi


for action in $@
do
  if [ ${action:0:1} = "+" ]
  then
    if [ -d ${wallDir}/${action:1} ]
    then
      echo ${action:1}/ >> ${wallDir}/listDirWall
    fi
  fi
  if [ ${action} = "list" ]
  then
      for d in `ls ${wallDir}`
      do
          if [ -d "${wallDir}/${d}" ]; then
              echo "$d/"
          fi
      done
      echo
  fi

  if [ ${action} = "del" -o ${action} = "delete" ]
  then
    rm $(cat ~/.actWall)
  fi
  if [ ${action} = "save" ]
  then
    cp ~/.actWall ~/.savedWall
    exit
  fi
  if [ ${action} = "unsave" ]
  then
    rm ~/.savedWall
    exit
  fi
  if [ ${action:0:1} = "-" ]
  then
    if [ -d ${wallDir}/${action:1} ]
    then
      sed -i "/${action:1}/d" ${wallDir}/listDirWall
    fi
  fi
  if [ ${action:0:1} = "=" ]
  then
    if [ -d ${wallDir}/${action:1} ]
    then
      sed -i "/^${action:1}\/$/d" ${wallDir}/listDirWall
    fi
  fi
done

if [ -e ~/.savedWall ] ; then
    wall=$(cat ~/.savedWall)
    cmd=$(printf "${cmd}" ${wall})
    echo ${cmd}
    eval ${cmd}
    exit
fi

cmpWall=0

for ligne in `cat ${wallDir}/listDirWall`
do
  cmpWall=$(( cmpWall + `ls "${wallDir}/$ligne" | wc -l` ))
  echo "$ligne : "
done

randWall=$[( $RANDOM % $cmpWall )]


for ligne in `cat ${wallDir}/listDirWall`
do
  if [ `ls "${wallDir}/$ligne" | wc -l` -gt $randWall ]
  then
    wall=${wallDir}/$ligne`ls ${wallDir}/$ligne | head -n $(($randWall + 1)) | tail -n 1`
    echo ${wall} > ~/.actWall
    cmd=$(printf "${cmd}" ${wall})
    echo ${cmd}
    eval ${cmd}
    echo "Wall set $wall"
    break
  else
    randWall=$(( randWall - `ls "${wallDir}/$ligne" | wc -l` ))
  fi
done

echo $cmpWall