#!/bin/bash
function setClone  {
        PRIMARY=$1
        SECONDARY=$2
        while read -r l
        do
                if echo $l | grep -Eq "^[a-zA-Z]"
                then
                        DEV=`echo $l | sed -e "s/ .*$//"`
                        MODELIST=`echo ${DEV} | sed -e "s/-/_/g"`_MODES
                        typeset -n CML=$MODELIST
                elif echo $l | grep -q "^[0-9]"
                then
                        MODE=`echo $l | sed -e "s/ .*$//"`
                        CML="${!MODELIST} $MODE"
                fi
        done
        PRIMARY_LIST=`echo ${PRIMARY} | sed -e "s/-/_/g"`_MODES
        SECONDARY_LIST=`echo ${SECONDARY} | sed -e "s/-/_/g"`_MODES
        typeset -n PRIMARY_MODES=$PRIMARY_LIST
        typeset -n SECONDARY_MODES=$SECONDARY_LIST
        MODE=""
        for pm in $PRIMARY_MODES
        do
                for sm in $SECONDARY_MODES
                do
                        if [ $pm = $sm -a -z $MODE ]
                        then
                                MODE=$pm
                        fi
                done
        done
        if [ -z "$MODE" ]
        then
                echo Nessun modo comune ERRORE!
                exit 2
        else
                echo $MODE

                xrandr --output $PRIMARY --mode $MODE
                xrandr --output $SECONDARY --mode $MODE
                xrandr --output $SECONDARY --same-as $PRIMARY
        fi
}

POSITION='right-of'
if [ -n "$1" ]
then
        if [ $1 = '-l' ]
        then
                POSITION='left-of'
        elif [ $1 = '-r' ]
        then
                POSITION='right-of'
        elif [ $1 = '-u' ]
        then
                POSITION='above'
        else
                echo "-l Display piccolo a sinisitra"
                echo "-r Display piccolo a destra"
                echo "-l Display piccolo sopra"
                exit 1
        fi
fi


PRIMARY=`xrandr | grep " connected" | grep primary | sed -e "s/ .*$//"`
# https://stackoverflow.com/questions/613572/capturing-multiple-line-output-into-a-bash-variable
declare R=($(xrandr | grep " connected" | grep -v primary | sed -e "s/[^ ]* c[^ ]* \([0-9]*\).*$/\1/"))

if expr ${R[0]} \< ${R[1]}
then
  SRES=${R[0]}
else
  SRES=${R[1]}
fi

echo risoluzion schermo piccolo $SRES

SECONDARY=`xrandr | grep " connected" | grep -v primary | grep -v ${SRES}x | sed -e "s/ .*$//"`
TERTIARY=`xrandr | grep " connected" | grep -v primary | grep ${SRES}x | sed -e "s/ .*$//"`
if [ -z $SECONDARY ]
then
        SECONDARY=`xrandr | grep " connected" | grep -v primary | grep ${SRES}x | grep -v $TERTIARY | sed -e "s/ .*$//"`
fi

# SECONDARY=DP-1
# TERTIARY=DP-2

echo Primary $PRIMARY
echo Secondary $SECONDARY
echo Tertiary $TERTIARY

xrandr | setClone $PRIMARY $SECONDARY
xrandr --output $TERTIARY --$POSITION $PRIMARY


# echo "xrandr | setClone $PRIMARY $SECONDARY same-as"
# xrandr | setClone $SECONDARY $TERTIARY same-as
# echo "xrandr --output $TERTIARY --$POSITION $PRIMARY"
# xrandr --output $SECONDARY --$POSITION $PRIMARY