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

echo "[go] starting go devcontainer install"

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

VERSION="${RUNTIME_VERSION:-1.25}"

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

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

if [ -x "${DEST_DIR}/bin/go" ]; then
  echo "[go] go ${VERSION} already installed"
else
  ARCHIVE="$(ls ${SRC_DIR}/go*.linux-amd64.tar.gz 2>/dev/null | head -n1)"
  if [ -z "${ARCHIVE}" ]; then
    echo "[go][ERROR] no Go archive found in ${SRC_DIR}"
    exit 1
  fi

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

  tar -xzf "${ARCHIVE}" -C "${DEST_DIR}" --strip-components=1
fi

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

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

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