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

PROVISION_TOOLS_DIR="${PROVISION_TOOLS_DIR:-provision-tools}"
OTELCOL_VERSION="${OTELCOL_VERSION:-0.151.0}"
PREPARE_OTELCOL="${PREPARE_OTELCOL:-${ENABLE_OTELCOL:-true}}"
OTELCOL_DOWNLOAD_ROOT="${OTELCOL_DOWNLOAD_ROOT:-https://github.com/open-telemetry/opentelemetry-collector-releases/releases/download}"
SPACETIME_INSTALLER_URL="${SPACETIME_INSTALLER_URL:-https://install.spacetimedb.com}"
SPACETIME_DOWNLOAD_ROOT="${SPACETIME_DOWNLOAD_ROOT:-https://github.com/clockworklabs/SpacetimeDB/releases/latest/download}"
PROVISION_DOWNLOAD_PROXY="${PROVISION_DOWNLOAD_PROXY:-}"
PROVISION_NO_PROXY="${PROVISION_NO_PROXY:-127.0.0.1,localhost}"
PROVISION_TOOLS_TMP_PARENT="${PROVISION_TOOLS_TMP_PARENT:-${WORKSPACE:-$(pwd)}/.tmp/server-provision-tools}"
TMP_DIR_TO_CLEAN=""
OTELCOL_SOURCE_DESCRIPTION="skipped"

cleanup_tmp_dir() {
  if [[ -n "${TMP_DIR_TO_CLEAN}" ]]; then
    rm -rf "${TMP_DIR_TO_CLEAN}"
  fi
}

require_cmd() {
  local name="$1"
  if ! command -v "${name}" >/dev/null 2>&1; then
    echo "[prepare-provision-tools] 缺少命令: ${name}" >&2
    exit 1
  fi
}

configure_download_proxy() {
  if [[ -z "${PROVISION_DOWNLOAD_PROXY}" ]]; then
    return
  fi

  export HTTP_PROXY="${PROVISION_DOWNLOAD_PROXY}"
  export HTTPS_PROXY="${PROVISION_DOWNLOAD_PROXY}"
  export ALL_PROXY="${PROVISION_DOWNLOAD_PROXY}"
  export http_proxy="${PROVISION_DOWNLOAD_PROXY}"
  export https_proxy="${PROVISION_DOWNLOAD_PROXY}"
  export all_proxy="${PROVISION_DOWNLOAD_PROXY}"
  export NO_PROXY="${PROVISION_NO_PROXY}"
  export no_proxy="${PROVISION_NO_PROXY}"
  echo "[prepare-provision-tools] 已配置下载代理: ${PROVISION_DOWNLOAD_PROXY%%://*}://***"
}

download_file() {
  local url="$1"
  local output="$2"

  if command -v curl >/dev/null 2>&1; then
    curl -fsSL --retry 3 --retry-delay 2 "${url}" -o "${output}"
  elif command -v wget >/dev/null 2>&1; then
    wget -O "${output}" "${url}"
  else
    echo "[prepare-provision-tools] 需要 curl 或 wget 下载: ${url}" >&2
    exit 1
  fi
}

make_spacetime_wrapper() {
  local target="$1"

  cat >"${target}" <<'EOF'
#!/usr/bin/env sh
set -eu
SELF_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
exec "$SELF_DIR/bin/current/spacetimedb-cli" "$@"
EOF
  chmod 0755 "${target}"
}

prepare_otelcol() {
  local tmp_dir="$1"
  local archive="${tmp_dir}/otelcol-contrib.tar.gz"
  local extract_dir="${tmp_dir}/otelcol-contrib"
  local url="${OTELCOL_DOWNLOAD_ROOT}/v${OTELCOL_VERSION}/otelcol-contrib_${OTELCOL_VERSION}_linux_amd64.tar.gz"
  local target="${PROVISION_TOOLS_DIR}/otelcol-contrib"

  require_cmd tar

  echo "[prepare-provision-tools] 下载 otelcol-contrib: ${url}"
  mkdir -p "${extract_dir}"
  download_file "${url}" "${archive}"
  OTELCOL_SOURCE_DESCRIPTION="download ${url}"
  tar -xzf "${archive}" -C "${extract_dir}"

  if [[ ! -x "${extract_dir}/otelcol-contrib" ]]; then
    echo "[prepare-provision-tools] otelcol-contrib 包中缺少可执行文件。" >&2
    exit 1
  fi

  install -m 0755 "${extract_dir}/otelcol-contrib" "${target}"
  "${target}" --version >/dev/null
}

prepare_spacetime() {
  local tmp_dir="$1"
  local install_root="${tmp_dir}/spacetime-root"
  local target_dir="${PROVISION_TOOLS_DIR}/spacetime"

  echo "[prepare-provision-tools] 使用官方安装器准备 SpacetimeDB: ${SPACETIME_INSTALLER_URL}"
  mkdir -p "${install_root}"
  download_file "${SPACETIME_INSTALLER_URL}" "${tmp_dir}/spacetime-install.sh"
  chmod 0755 "${tmp_dir}/spacetime-install.sh"
  TMPDIR="${tmp_dir}" SPACETIME_DOWNLOAD_ROOT="${SPACETIME_DOWNLOAD_ROOT}" sh "${tmp_dir}/spacetime-install.sh" --root-dir "${install_root}" -y

  if [[ ! -x "${install_root}/bin/current/spacetimedb-cli" ]]; then
    echo "[prepare-provision-tools] SpacetimeDB 安装结果缺少 bin/current/spacetimedb-cli。" >&2
    exit 1
  fi
  if [[ ! -x "${install_root}/bin/current/spacetimedb-standalone" ]]; then
    echo "[prepare-provision-tools] SpacetimeDB 安装结果缺少 bin/current/spacetimedb-standalone。" >&2
    exit 1
  fi

  mkdir -p "${target_dir}"
  cp -a "${install_root}/bin" "${target_dir}/bin"
  make_spacetime_wrapper "${target_dir}/spacetime"

  "${target_dir}/spacetime" --version >/dev/null
}

main() {
  local tmp_dir

  require_cmd chmod
  require_cmd cp
  require_cmd install
  require_cmd mktemp
  require_cmd rm

  configure_download_proxy

  mkdir -p "${PROVISION_TOOLS_TMP_PARENT}"
  tmp_dir="$(mktemp -d "${PROVISION_TOOLS_TMP_PARENT%/}/run.XXXXXX")"
  TMP_DIR_TO_CLEAN="${tmp_dir}"
  trap cleanup_tmp_dir EXIT

  rm -rf "${PROVISION_TOOLS_DIR}"
  mkdir -p "${PROVISION_TOOLS_DIR}"

  if [[ "${PREPARE_OTELCOL}" == "true" ]]; then
    prepare_otelcol "${tmp_dir}"
  else
    echo "[prepare-provision-tools] PREPARE_OTELCOL=${PREPARE_OTELCOL}，跳过 otelcol-contrib 工具包准备。"
  fi
  prepare_spacetime "${tmp_dir}"

  cat >"${PROVISION_TOOLS_DIR}/MANIFEST.txt" <<EOF
otelcol-contrib ${OTELCOL_VERSION} ${OTELCOL_SOURCE_DESCRIPTION}
spacetime installer ${SPACETIME_INSTALLER_URL}
spacetime download root ${SPACETIME_DOWNLOAD_ROOT}
EOF

  echo "[prepare-provision-tools] 工具包已准备: ${PROVISION_TOOLS_DIR}"
  find "${PROVISION_TOOLS_DIR}" -maxdepth 5 \( -type f -o -type l \) | sort
}

main "$@"