#!/bin/bash
function die () {
  echo 1>&2 "${1}"
  exit 1
}

function java_major_version () {
  for token in $(java -version 2>&1 | grep -i version) ; do
    case "${token}" in '"1'*)
      echo -n "${token}" | tr -d '"' | awk -F '.' '{print $1}'
    esac
  done
}

function handle_help_request() {
  if [[ -z "${2}" ]]; then
    return
  fi

  if [[ ${2} == "-h" || ${2} == "--help" ]]; then
    while IFS='' read -r line || [[ -n "$line" ]]; do
      if [[ ${line} =~ ^#.* ]]; then
        if [[ ! ${line} =~ ^#!/bin/bash.* ]]; then
          echo "${line}"
        fi
      else
        break
      fi
    done <"${1}"
    if [[ -z "${JVC_SKIP_ENV_VAR_HELP}" ]] ; then
      echo "# Environment Variables
#
#     JVC_SCRATCH_DIR  : Use this as the scratch directory
#                         Default is to create a new temp directory
#
#     JVC_NO_EXEC      : If set to anything, print the commands that would
#                         have run but do not execute anything
#
"
    fi
    exit 1
  fi
}

# Ensure Java is installed and that it is Java 11
if [[ -z "$(which java)" ]] ; then
  die "Java 11 (or higher) not installed (java command not found on PATH)"
fi
JAVA_VERSION="$(java_major_version)"
if [[ -z "${JAVA_VERSION}" ]] ; then
  die "Error determining Java version"
elif [[ ${JAVA_VERSION} -lt 11 ]] ; then
  die "Java 11 (or higher) not installed (java -version check failed)"
fi

JVC_DIR="$(cd "$(dirname "${0}")"/.. && pwd)"
JVC_JAR="$(find "${JVC_DIR}"/target -type f -name "jvc-*-prod.jar" | head -1)"
if [[ -z "${JVC_JAR}" ]] ; then
  # Ensure maven is installed
  if [[ -z "$(which mvn)" ]] ; then
    die "Maven not installed (mvn command not found on PATH), cannot build JVC jar"
  fi

  # Build and install utility library
  pushd "${JVC_DIR}"/utils/cobbzilla-utils || die "Error changing directories to ${JVC_DIR}/utils/cobbzilla-utils"
  mvn -DskipTests=true clean install || die "Error building cobbzilla-utils library"
  popd || die "popd error"

  # Build jvc uberjar
  pushd "${JVC_DIR}" || die "Error changing directories to ${JVC_DIR}"
  mvn -DskipTests=true -Puberjar clean package || die "Error building JVC jar"
  popd || die "popd error"

  JVC_JAR="$(find "${JVC_DIR}"/target -type f -name "jvc-*-prod.jar" | head -1)"
  if [[ -z "${JVC_JAR}" ]] ; then
    die "No JVC jar file found after successful build"
  fi
fi

SCRATCH_DIR=""
NO_EXEC=""
if [[ -z "${JVC_SKIP_ENV_VAR_HELP}" ]] ; then
  if [[ -n "${JVC_SCRATCH_DIR}" ]] ; then
    SCRATCH_DIR="--temp-dir ${JVC_SCRATCH_DIR}"
  fi

  if [[ -n "${JVC_NO_EXEC}" ]] ; then
    NO_EXEC="--no-exec"
  fi
fi
JVC_OPTIONS="${SCRATCH_DIR} ${NO_EXEC}"

handle_help_request "${0}" "${1}"