#!/bin/bash

set -e
set -u

APPSH_HOME=$(cd $(dirname "$0")/.. && pwd)

. $APPSH_HOME/lib/common
# HEADER END

calculate_md5() {
  local file="$1"; shift

  md5sum "$file" | cut -c 1-32
}
 
# TODO: support file:// repositories
# TODO: look in the local repository first
get() {
  local url=$1
  local file=$2
  local exit

  curl -o $file $url -D curl.tmp

  exit=`grep "^HTTP/[0-9]\.[0-9] 200 .*" curl.tmp >/dev/null; echo $?`
  head=`head -n 1 curl.tmp`
  rm -f curl.tmp
  if [ "$exit" != 0 ]
  then
    echo "Unable to download $url: $head" >&2
    exit 1
  fi
}

resolve_snapshot() {
  local groupId=$1; shift
  local groupIdSlash=$1; shift
  local artifactId=$1; shift
  local version=$1; shift

  local metadata=$apps/.app/var/download/$groupId-$artifactId-$version-metadata.xml
  local base_url=$repo/$groupIdSlash/$artifactId/$version
  get $base_url/maven-metadata.xml $metadata
  local resolved_version=`xmlstarlet sel -t -m '//snapshotVersion[extension[text()="zip"]]' -v value $metadata`
  echo $resolved_version
}

download_artifact() {
  local file="$1"; shift
  local url="$1"; shift

  echo "Downloading $url.md5"
  get $url.md5 $file.md5
  local expected_md5="`cat $file.md5`"

  if [ -r $file ]
  then
    if [ "$expected_md5" == "`calculate_md5 $file`" ]
    then
      echo "Artifact already downloaded."
    else
      rm -f "$file"
    fi
    return 0
  fi
  echo "Downloading artifact: $url"
  get $url $file

  local actual_md5="`calculate_md5 $file`"
  if [ "$expected_md5" == "$actual_md5" ]
  then
    echo "Artifact downloaded."
  else
    echo "Invalid checksum. Expected $expected_md5, got $actual_md5" >&2
    exit 1
  fi
}

if [ $# -lt 2 ]
then
  method_install_usage
fi

case "$resolver" in
  maven)
    ;;
  file)
    if [ ! -r "$url" ]
    then
      echo "Could not read file: $url" >&2
      exit 1
    fi

    # TODO: should the zip file be copied into download/ so that
    # there's always a local copy?
    zip_file=$url

    if [ -z "$version" ]
    then
      version=`TZ=UTC date +"%Y%m%d-%H%M%S"`
    fi

    resolved_version=$version
    ;;
  *)
    method_install_usage "Invalid resolver type: $resolver" 
    ;;
esac

if [ -d versions/$resolved_version ]
then
  echo "Version $resolved_version is already installed"
  exit 1
fi

mkdir -p versions/$resolved_version

echo "Unpacking..."
unzip -q -d versions/$resolved_version $zip_file

if [ ! -d versions/$resolved_version/root ]
then
  echo "Invalid zip file, did not contain a ./root directory." >&2
  exit 1
fi

echo "Changing current symlink"
rm -f current
ln -s versions/$resolved_version/root current

if [ -d current/bin ]
then
  (
    cd $name/$instance/current
    find bin -type f | xargs chmod +x
  )
fi

(
  cd versions/$resolved_version
  if [ -d scripts ]
  then
    find scripts | xargs chmod +x
  fi

  if [ -x scripts/postinstall ]
  then
    echo "Running postinstall..."
    cd root
    set +e
    env -i \
      PATH=/bin:/usr/bin \
      APPSH_APPS=$apps \
      APPSH_HOME=$APPSH_HOME \
      APPSH_VERSION=$resolved_version \
      ../scripts/postinstall
    set -e
    ret=`echo $?`
    if [ "$ret" != 0 ]
    then
      echo "Postinstall failed!"
      exit 1
    fi
    echo "Postinstall completed successfully"
  fi
)

#  if [ -r $apps/.app/var/list ]
#  then
#    sed "/^$name:$instance/d" $apps/.app/var/list > $apps/.app/var/list.new
#  fi
#  echo "$name:$instance:$version:$url" >> $apps/.app/var/list.new
#  mv $apps/.app/var/list.new $apps/.app/var/list