# if this file is executed, /bin/sh is used, as we don't start with #!
# this should work under ash, bash, zsh, ksh, sh style shells.

#the purpose of this file is to check/set up the environment for greenstone3
#sorts out:
#  - gsdl3home
#  - java

# java_min_version gets passed to search4j as the minimum java version
java_min_version=1.5.0_00


function testSource(){

  if test "$0" != "`echo $0 | sed s/gs3-setup\.sh//`" ; then
  # if $0 contains "gs3-setup.sh" we've been run... $0 is shellname if sourced.
  # One exception is zsh has an option to set it temporarily to the script name
    if test -z "$ZSH_NAME" ; then
    # we aren't using zsh
     gsdl_not_sourced=true
   fi 
  fi

  if test -n "$gsdl_not_sourced" ; then
     echo "  Error: Make sure you source this script, not execute it. Eg:"
     echo "    $ source gs3-setup.sh"
     echo "  or"
     echo "    $ . gs3-setup.sh"
     echo "  not"
     echo "    $ ./gs3-setup.sh"
     unset gsdl_not_sourced
     exit 1
  fi

  if test ! -f gs3-setup.sh ; then
    echo "You must source the script from within the Greenstone home directory"
    exit 1
  fi

}

function setGS3ENV() {

  echo "Setting up your environment for Greenstone3"
  ## main greenstone environment variables ##
  GSDL3SRCHOME="`pwd`"
  GSDL3HOME="$GSDL3SRCHOME/web"
  export GSDL3HOME
  export GSDL3SRCHOME

  GSDLOS=`uname -s | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
  # check for running bash under cygwin
  if test "`echo $GSDLOS | sed 's/cygwin//'`" != "$GSDLOS" ; then
    GSDLOS=windows
  fi 
  export GSDLOS
  echo "  - Exported GSDL3HOME, GSDL3SRCHOME and GSDLOS"

  #change this if external tomcat
  TOMCAT_HOME="$GSDL3SRCHOME/packages/tomcat"


  ## adjustments to users (existing) environment ##

  #PATH
  addtopath PATH "$GSDL3SRCHOME/bin/script"
  addtopath PATH "$GSDL3SRCHOME/bin"
  echo "  - Adjusted PATH"

  #MANPATH
  addtopath MANPATH "$GSDL3SRCHOME/doc/man"
  echo "  - Adjusted MANPATH"
 
  #CLASSPATH
  addtopath CLASSPATH "$GSDL3HOME/WEB-INF/classes"
  addtopath CLASSPATH "$GSDL3SRCHOME/resources/java"
  for JARFILE in "$GSDL3SRCHOME"/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done
  for JARFILE in "$GSDL3SRCHOME"/lib/jni/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done
  for JARFILE in "$GSDL3SRCHOME"/lib/java/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done
  for JARFILE in "$GSDL3HOME"/WEB-INF/lib/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done
  # Tomcat 5 jar files
  for JARFILE in "$TOMCAT_HOME"/common/endorsed/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done    
  # Tomcat 6 jar files
  for JARFILE in "$TOMCAT_HOME"/lib/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done    
  
  for JARFILE in "$GSDL3SRCHOME"/build/*.jar; do
    addtopath CLASSPATH "$JARFILE"
  done
  echo "  - Adjusted CLASSPATH"

  #LD_LIBRARY_PATH
  addtopath LD_LIBRARY_PATH "$GSDL3SRCHOME/lib/jni"
  addtopath DYLD_LIBRARY_PATH "$GSDL3SRCHOME/lib/jni"
  echo "  - Adjusted LD_LIBRARY_PATH and DYLD_LIBRARY_PATH"

  #ant
  if [ -x "$GSDL3SRCHOME/packages/ant/bin/ant" ]; then
    ANT_HOME="$GSDL3SRCHOME/packages/ant"
    export ANT_HOME
    addtopath PATH "$ANT_HOME/bin"
    echo "  - Setup Greenstone ant ($GSDL3SRCHOME/packages/ant)"
  else
    which ant &> /dev/null
    if [ "$?" == "0" ]; then
      echo "  - Greenstone 'Ant' package missing - falling back to system Ant"
    else
      echo "  - ERROR: Greenstone 'Ant' package missing - please install Ant yourself"
    fi
    echo "    (Greenstone requires Ant 1.7.1 or greater)"
  fi

}

function checkJava() {

  HINT="`pwd`/packages/jre"
  FOUNDJAVAHOME="`bin/search4j -p \"$HINT\" -m $java_min_version`"
  if [ "$?" == "0" ]; then
      #bundled java exists, set up
      export JAVA_HOME="$FOUNDJAVAHOME"
      addtopath PATH "$JAVA_HOME/bin"
      echo "  - Exported JAVA_HOME to $FOUNDJAVAHOME"
  else
      #no suitable java exists
      echo "  ERROR: Failed to locate java $java_min_version or greater"
      bin/search4j &> /dev/null;
      if [ "$?" == "0" ]; then echo "  It looks like you hava java but it's too old"; fi
      echo "  Please set JAVA_HOME or JRE_HOME to point to an appropriate java"
      echo "  And add JAVA_HOME/bin or JRE_HOME/bin to your PATH"
  fi
}

function pauseAndExit(){
 echo -n "Please press any key to continue... "
 read 
}

function isinpath() {
  for file in `echo $1 | sed 's/:/ /g'`; do
    if [ "$file" == "$2" ]; then
      echo true
      return
    fi
  done
  echo false
}

function addtopath() {
  eval "PV=\$$1"
  #echo "$1 += $2"
  if [ "$PV" == "" ]; then
    cmd="$1=\"$2\""
  else
    cmd="$1=\"$2:\$$1\""
  fi
  eval $cmd
  eval "export $1"
}

echo
testSource
setGS3ENV
checkJava