#!/bin/bash


SOURCE=$1
TARGET=$2
PARTIAL=$3

SIZE_EXPECTED=16777216		#bytes     16 MB
DIED_TIME=60                    #seconds

function test_existence
{
    if [ -f ${SOURCE}   ]
    then
       COUNTER=0

       #I have to check if the file is begin copied
       #I assume that it will reach the right
       #size in a few seconds

       while [ $(stat -c '%s' ${SOURCE} ) -lt $SIZE_EXPECTED ]
       do
          sleep 1
          let COUNTER+=1
          if [ 20 -lt $COUNTER ]
          then
             exit 1    # BAILING OUT
          fi
       done

       cp $SOURCE $TARGET
       exit 0
    fi
    echo ${SOURCE}"> not found"
    
    #if is looking for a history file and not exist 
    #I have suddenly exit
    echo $SOURCE | grep history > /dev/null 2>&1 && exit 1
}


while [ 1 ]
do 

   test_existence

   #CHECK IF THE MASTER IS ALIVE
   DELTA_TIME=$(( $( date +'%s' ) - $( stat -c '%Z' ${PARTIAL}/alive ) ))
   if [ $DIED_TIME -lt $DELTA_TIME ]
   then
       echo "Master is dead..."
       # Master is dead
       CURRENT_WAL=$( basename $SOURCE )
       echo "Partial: " ${PARTIAL}
       echo "Current wal: " ${CURRENT_WAL}
       echo "Target: " ${TARGET}
       cp ${PARTIAL}/${CURRENT_WAL}.partial ${TARGET}  > /dev/null 2>&1 && exit 0
       exit 1
   fi

   sleep 1

done