#!/bin/bash

#exit : 0 -> Everything went fine
#exit : 1 -> No parameter was set
#exit : 2 -> The indicated parameter is the same as the current STOREINTERVAL
#exit : 3 -> The parameter which represents the new STOREINTERVAL is not allowed

#Import config file
source /sensor/etc/sensorConfigurationFile.inc

#temporilary store the current store interval value in config file
currentStoreInterval=$STOREINTERVAL

#Create array of allowed values for parameter $1
allowedInterval=(0 1 2 5 10 15 30 60 120 360 720)

#Check if at least and only 1 parameter was set -> if there is no parameter exit:1
if [ "$#" -ne "1" ]; then
  exit 1
fi

#Check if parameter value is the same as the current store interval value in the config file -> if it is exit with exit status code 2
if [ "$currentStoreInterval" -eq "$1" ]; then
  exit 2
fi

#Store parameter in variable pStoreInterval
pStoreInterval=$1

#define allowedValue and set to 0 to use it later in if statement
allowedValue=0

#Loop through allowedInterval Array and verify whether the variable pStoreInterval is in it
for i in "${allowedInterval[@]}"
do
  #If the variable pStoreInterval is in the allowedInterval array, then set allowedValue to 1
  if [ "$i" -eq "$pStoreInterval" ]; then
    allowedValue=1
  fi
done

#Verify if allowedValue is equal to 1, if not exit:3
if [ "$allowedValue" -eq "1" ]; then
  #Store interval value is allowed
  #Create a temporary copy of the config file
  `touch $CONFIGLOCATION.sensorConfigurationFile.inc.$$`
  #Loop through the temporary file and change the value of STOREINTERVAL to the new value
  while read line; do
    if [ "$line" == "STOREINTERVAL=$currentStoreInterval" ]; then
      echo "STOREINTERVAL=$pStoreInterval" >> $CONFIGLOCATION.sensorConfigurationFile.inc.$$
    else
     echo $line >> $CONFIGLOCATION.sensorConfigurationFile.inc.$$
    fi
  done < $CONFIGLOCATION$CONFIGNAME
  #Delete the old config file
  rm $CONFIGLOCATION$CONFIGNAME
  #Rename the temporary config file to the actual name
  mv $CONFIGLOCATION.sensorConfigurationFile.inc.$$ $CONFIGLOCATION$CONFIGNAME

  #Change value in crontab
  #Convert integer to cronjob syntax
  if [ "$pStoreInterval" -eq "0" ]; then
    cronSyntax="* * * * *"
  fi

  if [ "$pStoreInterval" -eq "1" ]; then
    cronSyntax="* * * * *"
  fi

  if [ "$pStoreInterval" -eq "2" ]; then
    cronSyntax="*/2 * * * *"
  fi

  if [ "$pStoreInterval" -eq "5" ]; then
    cronSyntax="*/5 * * * *"
  fi

  if [ "$pStoreInterval" -eq "10" ]; then
    cronSyntax="*/10 * * * *"
  fi

  if [ "$pStoreInterval" -eq "15" ]; then
    cronSyntax="*/15 * * * *"
  fi

  if [ "$pStoreInterval" -eq "30" ]; then
    cronSyntax="*/30 * * * *"
  fi

  if [ "$pStoreInterval" -eq "60" ]; then
    cronSyntax="0 0-23 * * *"
  fi

  if [ "$pStoreInterval" -eq "120" ]; then
    cronSyntax="0 0-23/2 * * *"
  fi

  if [ "$pStoreInterval" -eq "360" ]; then
    cronSyntax="0 0-23/6 * * *"
  fi

  if [ "$pStoreInterval" -eq "720" ]; then
    cronSyntax="0 0-23/12 * * *"
  fi

  #Change in crontab
  #Put crontab content to a temporary file
  crontab -l > $CONFIGLOCATION.myCrontab.$$
  #Loop through the temporary file
  while read cronLine; do
    #Change the storeValues line to the new line
    if [[ "$cronLine" =~ "sudo "$SCRIPTLOCATION"storeValues" ]]; then
      echo "$cronSyntax sudo "$SCRIPTLOCATION"storeValues" >> $CONFIGLOCATION"newCrontab."$$
    else
      echo "$cronLine" >> $CONFIGLOCATION"newCrontab."$$
    fi
  done < $CONFIGLOCATION".myCrontab."$$
 #Overwrite the crontab with the new file
  crontab $CONFIGLOCATION"newCrontab."$$
  #Delete the temporary file
  rm $CONFIGLOCATION"newCrontab."$$
  rm $CONFIGLOCATION".myCrontab."$$
  #Restart cron
  /etc/init.d/cron restart
  #Output new values
  #echo "$cronSyntax"
  #echo $pStoreInterval
  exit 0
else
  #If the value is not allowed output this
  echo "The indicated value is not allowed"
  exit 3
fi