#!/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 -c \
        --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"
