#!/bin/bash -e
# Checks the dependencies of all checked out packages
#set -x

##############################################################################
# Pre-setup
##############################################################################
case `uname` in
  Darwin) ECHO=echo ;;
  *) ECHO="echo -e" ;;
esac

usage () {
  $ECHO "git icedust-check [options]"
  $ECHO
  $ECHO "Options:"
  $ECHO "-h, --help         \tthis help message"
  $ECHO
  $ECHO "-H, --home          \tProvide ICEDUST_HOME directory"
  $ECHO "-d, --debug        \tenable debug output"
  $ECHO "-f, --file FILE    \tread the list of packages to be checkoed out from FILE"
  $ECHO "-q, --quiet, -z    \tdo not print out progress"
  $ECHO "--skip-init        \tdon't run git icedust-init, useful when used in other scripts"
  exit $1
}

VERBOSE=1
VERBOSE_STREAM=/dev/stderr
DEBUG_STREAM=/dev/null

verbose () {
  if [ "X$VERBOSE" = X1 ]; then
    $ECHO "$@"
  fi
}

##############################################################################
# Parse options
##############################################################################
INITOPTIONS=""
ICEDUST_HOME="$ICEDUST_HOME"
PACKAGES=( )
SKIP_INIT=false
while [ "$#" != 0 ]; do
  case "$1" in
    -h | --help )
      usage 0;;
    -d | --debug )
      INITOPTIONS="$INITOPTIONS $1"
      shift; set -x; DEBUG_STREAM=/dev/stderr ;;
    -H | --home )
      shift; ICEDUST_HOME="`readlink -f "$1"`"
      shift ;;
    -q | --quiet | -z )
      INITOPTIONS="$INITOPTIONS $1"
      shift; set +x; VERBOSE=0; VERBOSE_STREAM=/dev/null ;;
    --skip-init)
      SKIP_INIT=true; shift;;
    -t) 
      INITOPTIONS="$INITOPTIONS $1"; shift;;
    -*)
      $ECHO Unknown option $1 ; usage 1 ;;
    *)
      PACKAGES=( "$1" "${PACKAGES[@]}" )
      shift
    ;;
  esac
done

if [ -z "$INTERNAL_CALL_CHECKDEPS" ];then
  tmp="`git icedust-home`"
  ICEDUST_HOME=`sed 's!^.*ICEDUST_HOME=\([^;]\+\);.*!\1!' <<<$tmp`
  ICEDUST_PROJECT=`sed 's!^.*ICEDUST_PROJECT=\([^;]\+\);.*!\1!' <<<$tmp`
  echo tmp
  unset tmp
fi
PackageDirectory="$ICEDUST_HOME/$ICEDUST_PROJECT/packages"
ExternalDirectory="$PackageDirectory/EXTERNALS"

##############################################################################
# Find dependencies for a single cmt/requirements file
##############################################################################
function GetCMTDependencies(){
_package="$1"
_file="$1/cmt/requirements"
if [ -r "$_file" ];then
cat "$_file"| grep '^[[:space:]]*use[[:space:]]\+[[:alnum:]]\+' | tee -a $DEBUG_STREAM | sed -e 's!^\s*use \+\(\S\+\).*!\1!'
fi
}

function PassOnceOverPackages(){
local Outfile="$1"

# check the dependencies of each dependency file
for Package in "$PackageDirectory/"* "$ExternalDirectory/"*; do
	GetCMTDependencies $Package >> $Outfile
done

# remove duplicates
local Sorted="`sort -u $Outfile`"
echo "" > "$Outfile"
# remove already obtained packages
for Package in $Sorted;do
if [ -f "$PackageDirectory/$Package/README" ] || [ -f "$ExternalDirectory/$Package/README" ] ; then 
        continue 
fi 
$ECHO "$Package  " |tee "$DEBUG_STREAM" >> "$Outfile"
done 

# Get all the new packages
if [ `grep -v '^\s*$' $Outfile|wc -l` -gt 0 ];then
  git icedust-add $INITOPTIONS -f "$Outfile" --skip-init
fi
}

##############################################################################
# Main body
##############################################################################
if ! $SKIP_INIT; then 
	git icedust-setup $INITOPTIONS
fi

TmpFile1=`mktemp`
TmpFile2=`mktemp`
# make one pass
PassOnceOverPackages $TmpFile1 
# As long as we keep adding packages keep going
while ! `diff -w -B -q "$TmpFile1" "$TmpFile2" >> $DEBUG_STREAM`;do
  mv -f "$TmpFile1" "$TmpFile2"
  PassOnceOverPackages "$TmpFile1"
done