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

PROVISION_TOOLS_DIR="${PROVISION_TOOLS_DIR:-provision-tools}"
PROVISION_DOWNLOADS_DIR="${PROVISION_DOWNLOADS_DIR:-}"
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}"
OTELCOL_ARCHIVE_PATH="${OTELCOL_ARCHIVE_PATH:-}"
OTELCOL_TARGET_BIN="${OTELCOL_TARGET_BIN:-/usr/local/bin/otelcol-contrib}"
SPACETIME_INSTALLER_URL="${SPACETIME_INSTALLER_URL:-https://install.spacetimedb.com}"
SPACETIME_DOWNLOAD_ROOT="${SPACETIME_DOWNLOAD_ROOT:-https://github.com/clockworklabs/SpacetimeDB/releases/download/v2.4.1}"
SPACETIME_TARGET_HOST="${SPACETIME_TARGET_HOST:-x86_64-unknown-linux-gnu}"
SPACETIME_ROOT="${SPACETIME_ROOT:-/stdb}"
SPACETIME_EXPECTED_VERSION="${SPACETIME_EXPECTED_VERSION:-}"
SPACETIME_ARCHIVE_PATH="${SPACETIME_ARCHIVE_PATH:-}"
SPACETIME_INSTALLER_PATH="${SPACETIME_INSTALLER_PATH:-}"
SPACETIME_UPDATE_INSTALLER_PATH="${SPACETIME_UPDATE_INSTALLER_PATH:-}"
PROVISION_DOWNLOAD_PROXY="${PROVISION_DOWNLOAD_PROXY:-}"
PROVISION_NO_PROXY="${PROVISION_NO_PROXY:-127.0.0.1,localhost}"
PROVISION_REQUIRE_LOCAL_DOWNLOADS="${PROVISION_REQUIRE_LOCAL_DOWNLOADS:-false}"
PROVISION_TOOLS_TMP_PARENT="${PROVISION_TOOLS_TMP_PARENT:-${WORKSPACE:-$(pwd)}/.tmp/server-provision-tools}"
TMP_DIR_TO_CLEAN=""
OTELCOL_SOURCE_DESCRIPTION="skipped"
SPACETIME_SOURCE_DESCRIPTION="unset"

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
}

resolve_spacetime_expected_version() {
  local download_root="${SPACETIME_DOWNLOAD_ROOT%/}"

  if [[ -n "${SPACETIME_EXPECTED_VERSION}" ]]; then
    printf "%s" "${SPACETIME_EXPECTED_VERSION}"
    return
  fi

  if [[ "${download_root}" =~ /v([0-9]+(\.[0-9]+){1,2})$ ]]; then
    printf "%s" "${BASH_REMATCH[1]}"
  fi
}

target_otelcol_ready() {
  local version_output

  echo "[prepare-provision-tools] 检查目标机 otelcol-contrib: ${OTELCOL_TARGET_BIN}"
  if [[ ! -x "${OTELCOL_TARGET_BIN}" ]]; then
    echo "[prepare-provision-tools] 目标机 otelcol-contrib 不存在或不可执行，将准备交付文件。"
    return 1
  fi

  version_output="$("${OTELCOL_TARGET_BIN}" --version 2>/dev/null || true)"
  if [[ -n "${OTELCOL_VERSION}" && "${version_output}" != *"${OTELCOL_VERSION}"* ]]; then
    echo "[prepare-provision-tools] 目标机 otelcol-contrib 版本不匹配，期望 ${OTELCOL_VERSION}，当前: ${version_output:-unknown}"
    return 1
  fi

  echo "[prepare-provision-tools] 目标机 otelcol-contrib 已满足要求: ${version_output:-version unknown}"
  return 0
}

target_spacetime_ready() {
  local target_cli="${SPACETIME_ROOT}/bin/current/spacetimedb-cli"
  local target_standalone="${SPACETIME_ROOT}/bin/current/spacetimedb-standalone"
  local expected_version version_output

  echo "[prepare-provision-tools] 检查目标机 SpacetimeDB: ${SPACETIME_ROOT}/bin/current"
  if [[ ! -x "${target_cli}" || ! -x "${target_standalone}" ]]; then
    echo "[prepare-provision-tools] 目标机 SpacetimeDB current 目录不完整，将准备交付文件。"
    return 1
  fi

  expected_version="$(resolve_spacetime_expected_version)"
  version_output="$("${target_cli}" --version 2>/dev/null || true)"
  if [[ -n "${expected_version}" && "${version_output}" != *"${expected_version}"* ]]; then
    echo "[prepare-provision-tools] 目标机 SpacetimeDB 版本不匹配，期望 ${expected_version}，当前: ${version_output:-unknown}"
    return 1
  fi

  echo "[prepare-provision-tools] 目标机 SpacetimeDB 已满足要求: ${version_output:-version unknown}"
  return 0
}

validate_relative_dir() {
  local label="$1"
  local path="$2"

  if [[ -z "${path}" ]]; then
    return
  fi
  if [[ "${path}" == /* || "${path}" == *..* || "${path}" == "." ]]; then
    echo "[prepare-provision-tools] ${label} 只能是工作区内的相对路径: ${path}" >&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 downloaded_archive="${PROVISION_DOWNLOADS_DIR}/otelcol-contrib_${OTELCOL_VERSION}_linux_amd64.tar.gz"
  local source_archive=""
  local target="${PROVISION_TOOLS_DIR}/otelcol-contrib"

  require_cmd tar

  if target_otelcol_ready; then
    echo "[prepare-provision-tools] 复用目标机已有 otelcol-contrib: ${OTELCOL_TARGET_BIN}"
    install -m 0755 "${OTELCOL_TARGET_BIN}" "${target}"
    "${target}" --version >/dev/null
    OTELCOL_SOURCE_DESCRIPTION="target existing ${OTELCOL_TARGET_BIN}"
    return
  fi

  if [[ -n "${OTELCOL_ARCHIVE_PATH}" && -f "${OTELCOL_ARCHIVE_PATH}" ]]; then
    source_archive="${OTELCOL_ARCHIVE_PATH}"
  elif [[ -n "${PROVISION_DOWNLOADS_DIR}" && -f "${downloaded_archive}" ]]; then
    source_archive="${downloaded_archive}"
  fi
  if [[ "${PROVISION_REQUIRE_LOCAL_DOWNLOADS}" == "true" && -z "${source_archive}" ]]; then
    echo "[prepare-provision-tools] 要求使用本地已有的 otelcol-contrib 来源，但目标机未满足且未找到下载包: ${downloaded_archive}" >&2
    exit 1
  fi

  mkdir -p "${extract_dir}"
  if [[ -n "${source_archive}" ]]; then
    echo "[prepare-provision-tools] 使用已下载的 otelcol-contrib 包: ${source_archive}"
    cp "${source_archive}" "${archive}"
    OTELCOL_SOURCE_DESCRIPTION="local ${source_archive}"
  else
    echo "[prepare-provision-tools] 下载 otelcol-contrib: ${url}"
    download_file "${url}" "${archive}"
    OTELCOL_SOURCE_DESCRIPTION="download ${url}"
  fi
  tar -xzf "${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="${PROVISION_TOOLS_DIR}/spacetime"
  local archive_name="spacetime-${SPACETIME_TARGET_HOST}.tar.gz"
  local downloaded_archive="${PROVISION_DOWNLOADS_DIR}/${archive_name}"
  local source_archive=""
  local update_name="spacetimedb-update-${SPACETIME_TARGET_HOST}"
  local downloaded_update="${PROVISION_DOWNLOADS_DIR}/${update_name}"
  local source_update=""
  local prepared_update="${tmp_dir}/spacetimedb-update"
  local downloaded_installer="${PROVISION_DOWNLOADS_DIR}/spacetime-install.sh"
  local source_installer=""

  if target_spacetime_ready; then
    echo "[prepare-provision-tools] 复用目标机已有 SpacetimeDB 安装: ${SPACETIME_ROOT}/bin/current"
    mkdir -p "${target_dir}"
    cp -a "${SPACETIME_ROOT}/bin" "${target_dir}/bin"
    chmod 0755 "${target_dir}/bin/current/spacetimedb-cli" "${target_dir}/bin/current/spacetimedb-standalone"
    make_spacetime_wrapper "${target_dir}/spacetime"
    "${target_dir}/spacetime" --version >/dev/null
    SPACETIME_SOURCE_DESCRIPTION="target existing ${SPACETIME_ROOT}/bin/current"
    return
  fi

  mkdir -p "${install_root}"
  if [[ -n "${SPACETIME_ARCHIVE_PATH}" && -f "${SPACETIME_ARCHIVE_PATH}" ]]; then
    source_archive="${SPACETIME_ARCHIVE_PATH}"
  elif [[ -n "${PROVISION_DOWNLOADS_DIR}" && -f "${downloaded_archive}" ]]; then
    source_archive="${downloaded_archive}"
  fi

  if [[ -n "${source_archive}" ]]; then
    echo "[prepare-provision-tools] 使用已下载的 SpacetimeDB release tarball: ${source_archive}"
    mkdir -p "${install_root}/bin/current"
    tar -xzf "${source_archive}" -C "${install_root}/bin/current"
    chmod 0755 "${install_root}/bin/current/spacetimedb-cli" "${install_root}/bin/current/spacetimedb-standalone"
    SPACETIME_SOURCE_DESCRIPTION="local archive ${source_archive}"
  elif [[ -n "${SPACETIME_UPDATE_INSTALLER_PATH}" && -f "${SPACETIME_UPDATE_INSTALLER_PATH}" ]]; then
    source_update="${SPACETIME_UPDATE_INSTALLER_PATH}"
  elif [[ -n "${PROVISION_DOWNLOADS_DIR}" && -f "${downloaded_update}" ]]; then
    source_update="${downloaded_update}"
  fi
  if [[ "${PROVISION_REQUIRE_LOCAL_DOWNLOADS}" == "true" && -z "${source_archive}" ]]; then
    echo "[prepare-provision-tools] 要求使用本地已有的 SpacetimeDB release tarball，但目标机未满足且未找到下载包: ${downloaded_archive}" >&2
    exit 1
  fi

  if [[ -n "${source_archive}" ]]; then
    :
  elif [[ -n "${source_update}" ]]; then
    echo "[prepare-provision-tools] 使用已下载的 SpacetimeDB Linux update installer: ${source_update}"
    cp "${source_update}" "${prepared_update}"
    chmod 0755 "${prepared_update}"
    TMPDIR="${tmp_dir}" "${prepared_update}" --root-dir "${install_root}" -y
    SPACETIME_SOURCE_DESCRIPTION="local update ${source_update}"
  else
    if [[ -n "${SPACETIME_INSTALLER_PATH}" && -f "${SPACETIME_INSTALLER_PATH}" ]]; then
      source_installer="${SPACETIME_INSTALLER_PATH}"
    elif [[ -n "${PROVISION_DOWNLOADS_DIR}" && -f "${downloaded_installer}" ]]; then
      source_installer="${downloaded_installer}"
    fi

    if [[ "${PROVISION_REQUIRE_LOCAL_DOWNLOADS}" == "true" && -z "${source_installer}" ]]; then
      echo "[prepare-provision-tools] 要求使用本地已有的 SpacetimeDB 官方安装器脚本，但未找到: ${downloaded_installer}" >&2
      exit 1
    elif [[ -n "${source_installer}" ]]; then
      echo "[prepare-provision-tools] 使用已下载的 SpacetimeDB 官方安装器脚本: ${source_installer}"
      cp "${source_installer}" "${tmp_dir}/spacetime-install.sh"
    else
      echo "[prepare-provision-tools] 下载 SpacetimeDB 官方安装器脚本: ${SPACETIME_INSTALLER_URL}"
      download_file "${SPACETIME_INSTALLER_URL}" "${tmp_dir}/spacetime-install.sh"
    fi
    chmod 0755 "${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
    SPACETIME_SOURCE_DESCRIPTION="installer ${SPACETIME_INSTALLER_URL}; download root ${SPACETIME_DOWNLOAD_ROOT}"
  fi

  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
  require_cmd tar

  validate_relative_dir "PROVISION_TOOLS_DIR" "${PROVISION_TOOLS_DIR}"
  validate_relative_dir "PROVISION_DOWNLOADS_DIR" "${PROVISION_DOWNLOADS_DIR}"
  if [[ -n "${PROVISION_DOWNLOADS_DIR}" && "${PROVISION_DOWNLOADS_DIR%/}" == "${PROVISION_TOOLS_DIR%/}" ]]; then
    echo "[prepare-provision-tools] PROVISION_DOWNLOADS_DIR 不能等于 PROVISION_TOOLS_DIR，否则会被清理: ${PROVISION_DOWNLOADS_DIR}" >&2
    exit 1
  fi

  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 ${SPACETIME_SOURCE_DESCRIPTION}
spacetime target host ${SPACETIME_TARGET_HOST}
require local downloads ${PROVISION_REQUIRE_LOCAL_DOWNLOADS}
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 "$@"