#!/bin/bash
# This is a specialized randomizer function
# that will randomize when AU will be triggered
# for sceduled updates for a Mac
rand(){
  local max_value="$1"
  n=$RANDOM
  var=$[ 1 + $n % $max_value ]
  retValue=$var
}

# Make the appropriate Changes to plist file post-AU if the com.oracle.java.Java-Updater.plist is changed
#Get the stored value of preferences
HTHOUR=`defaults read /Library/Preferences/com.oracle.java.Helper-Tool HTHour 2> /dev/null`
HTMINUTE=`defaults read /Library/Preferences/com.oracle.java.Helper-Tool HTMinute 2> /dev/null`
HTWEEKDAY=`defaults read /Library/Preferences/com.oracle.java.Helper-Tool HTWeekday 2> /dev/null`
# Constants
LAUNCHD_PLIST_SRC=/Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Resources/com.oracle.java.Java-Updater.plist
LAUNCHD_PLIST_DEST=/Library/LaunchAgents/
LAUNCHD_PLIST_NAME=com.oracle.java.Java-Updater.plist
# Commands
PLISTBUDDY=/usr/libexec/PListBuddy
SED=`which sed`
CHMOD=`which chmod`
LAUNCHCTL=`which launchctl`

# Values
HOUR_VALUE=`date +%H`
MINUTE_VALUE=`date +%M`

# If defaults are already set then over-write with defaults. Else Randomize
if [ -z "${HTHOUR}" ] || [ -z "${HTMINUTE}" ] || [ -z "${HTWEEKDAY}" ]; then
	rand 7
        ${SED} -i "" -e "s/2/${retValue}/g" -e "s/00/${MINUTE_VALUE}/g" -e "s/09/${HOUR_VALUE}/g" "${LAUNCHD_PLIST_SRC}"
else
        ${PLISTBUDDY} -c "Set :StartCalendarInterval:Hour '${HTHOUR}'" "${LAUNCHD_PLIST_SRC}"
        ${PLISTBUDDY} -c "Set :StartCalendarInterval:Minute '${HTMINUTE}'" "${LAUNCHD_PLIST_SRC}"
        ${PLISTBUDDY} -c "Set :StartCalendarInterval:Weekday '${HTWEEKDAY}'" "${LAUNCHD_PLIST_SRC}"
fi
${CHMOD} 644 "${LAUNCHD_PLIST_SRC}"
${LAUNCHCTL} unload "${LAUNCHD_PLIST_DEST}/${LAUNCHD_PLIST_NAME}"
${LAUNCHCTL} load "${LAUNCHD_PLIST_DEST}/${LAUNCHD_PLIST_NAME}"