#!/usr/bin/env bash
set -euo pipefail

echo "[java] starting java devcontainer install"

# --------------------------------------------------
# Config
# --------------------------------------------------
RUNTIME_ROOT="/opt/zlh/runtime/java"
ARTIFACT_ROOT="/opt/zlh/devcontainer/java"

VERSION="${RUNTIME_VERSION:-17}"

SRC_DIR="${ARTIFACT_ROOT}/${VERSION}"
DEST_DIR="${RUNTIME_ROOT}/${VERSION}"
SYMLINK="${RUNTIME_ROOT}/current"

# --------------------------------------------------
# Guards
# --------------------------------------------------
if [ ! -d "${SRC_DIR}" ]; then
  echo "[java][ERROR] artifact directory not found: ${SRC_DIR}"
  exit 1
fi

if [ -x "${DEST_DIR}/bin/java" ]; then
  echo "[java] java ${VERSION} already installed"
else
  ARCHIVE="$(ls ${SRC_DIR}/*.tar.gz 2>/dev/null | head -n1)"
  if [ -z "${ARCHIVE}" ]; then
    echo "[java][ERROR] no Java archive found in ${SRC_DIR}"
    exit 1
  fi

  echo "[java] installing java ${VERSION}"
  mkdir -p "${DEST_DIR}"

  TMP_DIR="$(mktemp -d)"
  tar -xzf "${ARCHIVE}" -C "${TMP_DIR}"

  # Java archives contain a single root dir
  EXTRACTED_DIR="$(find ${TMP_DIR} -maxdepth 1 -type d -name 'jdk*' | head -n1)"
  if [ -z "${EXTRACTED_DIR}" ]; then
    echo "[java][ERROR] failed to locate extracted jdk directory"
    exit 1
  fi

  mv "${EXTRACTED_DIR}"/* "${DEST_DIR}/"
  rm -rf "${TMP_DIR}"
fi

# --------------------------------------------------
# Symlink current
# --------------------------------------------------
ln -sfn "${DEST_DIR}" "${SYMLINK}"

# --------------------------------------------------
# Verify
# --------------------------------------------------
"${SYMLINK}/bin/java" -version

echo "[java] java ${VERSION} install complete"