#!/bin/bash

echo "Begin: installation of Java"
set -e

distro=$(lsb_release -is || :)

: ${JAVA_TARGET_LOCATION:="/usr/java"}

# NOTE: $(dirname $0) is read-only, use space under $TARGET_ROOT
JAVA_HOME=$TARGET_ROOT$JAVA_TARGET_LOCATION
mkdir -p $JAVA_HOME

if [ -n "$JAVA_DOWNLOAD_URL" ]; then
   install-packages wget
   JAVA_FILE=$(basename $JAVA_DOWNLOAD_URL)
   wget --no-check-certificate --no-cookies \
       --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" \
       -O $JAVA_HOME/$JAVA_FILE $JAVA_DOWNLOAD_URL
   if [ $? -eq 0 ]; then
      echo "Java download successful"
   else
      echo "Error downloading $JAVA_DOWNLOAD_URL, exiting"
      exit 1
   fi
elif [ -n "$JAVA_FILE" ]; then
   install -D -g root -o root -m 0755 $(dirname $0)/$JAVA_FILE $JAVA_HOME
fi

if [ -z "$JAVA_FILE" ]; then
   install-packages default-jre
else
   cd $JAVA_HOME
   if [[ $JAVA_FILE == *.tar.gz ]]; then
      echo "Decompressing Java archive"
      echo -e "\n" | tar -zxf $JAVA_FILE
      JAVA_NAME=`ls -1 $JAVA_TARGET_LOCATION | grep -v tar.gz`
      echo "Setting up $JAVA_NAME"
      chown -R root:root $JAVA_HOME
      cat >> /etc/profile.d/java.sh <<EOF
# Custom Java install
export JAVA_HOME=$JAVA_TARGET_LOCATION/$JAVA_NAME
export PATH=\$PATH:$JAVA_TARGET_LOCATION/$JAVA_NAME/bin
EOF
      case "$distro" in
         Ubuntu )
            echo "Setting up alternatives for Java"
            update-alternatives --install "/usr/bin/java" "java" "$JAVA_TARGET_LOCATION/$JAVA_NAME/bin/java" 1
            update-alternatives --install "/usr/bin/javac" "javac" "$JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javac" 1
            update-alternatives --install "/usr/bin/javaws" "javaws" "$JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javaws" 1

            update-alternatives --set java $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/java
            update-alternatives --set javac $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javac
            update-alternatives --set javaws $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javaws
         ;;
         Fedora | RedHatEnterpriseServer | CentOS )
            alternatives --install /usr/bin/java java $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/java 200000
            alternatives --install /usr/bin/javaws javaws $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javaws 200000
            alternatives --install /usr/bin/javac javac $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/javac 200000
            alternatives --install /usr/bin/jar jar $JAVA_TARGET_LOCATION/$JAVA_NAME/bin/jar 200000
         ;;
      esac
   elif [[ $JAVA_FILE == *.bin ]]; then
      echo -e "\n" | sh $JAVA_FILE
   else
      echo "Unknown file type: $JAVA_FILE, exiting"
      exit 1
   fi
   rm $JAVA_FILE
fi

echo "End: installation of Java"