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 #!/bin/bash
 set -u
 set -e
 set -o pipefail
 
 SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
 
 export SPACK_COLOR=always
 
 function start_section() {
     local section_name="$1"
     if [ -n "${GITHUB_ACTIONS:-}" ]; then
         echo "::group::${section_name}"
     else
         echo "${section_name}"
     fi
 }
 
 function end_section() {
     if [ -n "${GITHUB_ACTIONS:-}" ]; then
         echo "::endgroup::"
     fi
 }
 
 # Signatures in a command's output that indicate a *transient* failure (network
 # / registry hiccup) that a retry can plausibly fix. Anything that does not
 # match one of these is treated as a genuine failure and is NOT retried, so we
 # don't burn CI time looping on an error a retry cannot resolve (compile error,
 # disk full, bad spec, ...).
 #
 # NOTE on "no binary available": spack does *not* surface a throttled/failed
 # GHCR fetch as a network error. Under `--use-buildcache only` it swallows the
 # fetch failure and reports the spec as simply having no binary, which is by far
 # the most common transient failure we see. So those signatures are treated as
 # transient and retried. The cost of being wrong is bounded (a genuinely missing
 # binary just burns the retry budget before failing), whereas not retrying turns
 # every GHCR hiccup into a red build.
 TRANSIENT_ERROR_PATTERNS=(
   # spack buildcache misses caused by upstream fetch/rate-limit failures
   "No binary for"
   "no binary available"
   "NoBinaryFoundError"
   "cannot install.*cache-only"
   "Failed to install.*due to.*FetchError"
   "Failed to fetch"
   "fetch failed"
   "FetchError"
   "curl.*(error|failed|timed out|Could not resolve)"
   "Connection reset"
   "Connection refused"
   "Connection timed out"
   "Could not resolve host"
   "Temporary failure in name resolution"
   "Network is unreachable"
   "Read timed out"
   "read timeout"
   "timed out"
   "[Tt]imeout"
   "TLS handshake"
   "EOF occurred"
   "Server disconnected"
   "Remote end closed connection"
   "toomanyrequests"
   "Too Many Requests"
   "rate limit"
   # GitHub sheds anonymous load with "GitHub is temporarily limiting some
   # unauthenticated downloads to protect the stability of the platform. Please
   # retry later or authenticate." github_auth.sh keeps us off that quota, but
   # the message is explicitly a "try again" and must not be a hard failure.
   "temporarily limiting"
   "unauthenticated download"
   "Please retry later"
   "HTTP Error 429"
   "HTTP Error 5[0-9][0-9]"
   "50[0-9] (Internal Server Error|Bad Gateway|Service Unavailable|Gateway Time-out)"
   "unable to access.*github.com"
   "RPC failed"
   "early EOF"
 )
 
 # Run "$@", streaming its combined output while also capturing it. On failure,
 # retry with exponential backoff *only* when the captured output matches a known
 # transient-error signature; otherwise return the command's exit status
 # immediately. Output is streamed live (via tee) so long-running commands don't
 # trip CI "no output" watchdogs.
 #
 # Backoff is 20s, 40s, 80s, 160s, 320s (+/- jitter) by default: ~10 min of total
 # wait across 6 attempts. GHCR rate-limit windows outlast a short backoff, so a
 # tight schedule just burns all attempts inside the same bad window and still
 # fails. Jitter keeps the many parallel CI jobs from retrying in lockstep and
 # re-triggering the limit together.
 function retry_transient() {
   local max_attempts=${DEP_RETRY_MAX_ATTEMPTS:-6}
   local delay=${DEP_RETRY_BASE_DELAY:-20}
   local attempt=1
   local log status pat matched jitter sleep_for
   log=$(mktemp)
   while true; do
     echo "attempt ${attempt}/${max_attempts}: $*"
     status=0
     # pipefail (set above) makes PIPESTATUS[0] the command's own exit status.
     "$@" 2>&1 | tee "${log}" || status=${PIPESTATUS[0]}
     if [ "${status}" -eq 0 ]; then
       rm -f "${log}"
       return 0
     fi
 
     matched=""
     for pat in "${TRANSIENT_ERROR_PATTERNS[@]}"; do
       if grep -qiE -- "${pat}" "${log}"; then
         matched="${pat}"
         break
       fi
     done
     rm -f "${log}"
 
     if [ -z "${matched}" ]; then
       echo "Command failed (exit ${status}) with no transient-error signature; not retrying"
       return "${status}"
     fi
     if [ "${attempt}" -ge "${max_attempts}" ]; then
       echo "Command still failing after ${max_attempts} attempts (last transient signature: '${matched}')"
       return "${status}"
     fi
     # +/-25% jitter so parallel jobs don't retry in lockstep.
     jitter=$(( (RANDOM % (delay / 2 + 1)) - delay / 4 ))
     sleep_for=$(( delay + jitter ))
     [ "${sleep_for}" -lt 1 ] && sleep_for=1
     echo "Transient failure detected (matched '${matched}'); retrying in ${sleep_for}s"
     sleep "${sleep_for}"
     attempt=$((attempt + 1))
     delay=$((delay * 2))
   done
 }
 
 # Parse command line arguments
 while getopts "c:t:d:e:s:F:fh" opt; do
   case ${opt} in
     c )
       compiler=$OPTARG
       ;;
     F )
       flavor=$OPTARG
       ;;
     t )
       tag=$OPTARG
       ;;
     d )
       destination=$OPTARG
       ;;
     e )
       env_file=$OPTARG
       ;;
     s )
       cxx_std=$OPTARG
       ;;
     f )
       full_install=true
       ;;
     h )
       echo "Usage: $0 [-c compiler] [-t tag] [-d destination] -e env_file [-h]"
       echo "Options:"
       echo "  -c <compiler>    Specify compiler (defaults to CXX env var)"
       echo "  -t <tag>         Specify dependency tag (defaults to DEPENDENCY_TAG env var)"
       echo "  -d <destination> Specify install destination (defaults based on CI environment)"
       echo "  -e <env_file>    Specify environment file to output environments to"
       echo "  -s <cxx_std>     C++ standard for lockfile selection (e.g. 20, 23). Defaults to CXXSTD env var or 20."
       echo "  -F <flavor>      Accelerator flavor (e.g. cuda13, rocm7). Defaults to FLAVOR env var or the host stack."
       echo "  -f               Full dependency installation. Includes Geant4 datasets and Python packages."
       echo "  -h               Show this help message"
       exit 0
       ;;
     \? )
       echo "Invalid option: -$OPTARG" 1>&2
       exit 1
       ;;
     : )
       echo "Option -$OPTARG requires an argument" 1>&2
       exit 1
       ;;
   esac
 done
 
 script_start=$(date +%s.%N)
 
 # Helper to print elapsed time since previous checkpoint
 checkpoint() {
     local label=$1
     local now
     now=$(date +%s.%N)
     local elapsed
     elapsed=$(echo "$now - ${last_time:-$script_start}" | bc)
     printf "[%s] %.3f s\n" "$label" "$elapsed"
     last_time=$now
 }
 
 # Set defaults if not specified
 if [ -z "${compiler:-}" ]; then
   compiler="${CXX:-default}"
 fi
 
 if [ -z "${tag:-}" ]; then
   tag="${DEPENDENCY_TAG:-}"
   if [ -z "${tag:-}" ]; then
     echo "No tag specified via -t or DEPENDENCY_TAG environment variable"
     exit 1
   fi
 fi
 
 if [ -z "${destination:-}" ]; then
   if [ -n "${GITHUB_ACTIONS:-}" ]; then
     destination="${GITHUB_WORKSPACE}/dependencies"
   elif [ -n "${GITLAB_CI:-}" ]; then
     destination="${CI_PROJECT_DIR}/dependencies"
   else
     echo "No destination specified via -d and not running in CI"
     exit 1
   fi
 fi
 
 if [ -z "${env_file:-}" ]; then
   echo "No environment file specified via -e"
   exit 1
 fi
 
 if [ -z "${cxx_std:-}" ]; then
   cxx_std="${CXXSTD:-20}"
 fi
 
 # `host` is the plain CPU stack, published with no flavor token: pass nothing.
 if [ -z "${flavor:-}" ]; then
   flavor="${FLAVOR:-}"
 fi
 if [ "${flavor}" == "host" ]; then
   flavor=""
 fi
 
 checkpoint "Create environment file $(realpath "$env_file")"
 echo "" > "$env_file"
 export env_file
 
 function set_env {
   key="$1"
   value="$2"
 
   echo "=> ${key}=${value}"
 
   echo "export ${key}=${value}" >> "$env_file"
 }
 
 
 
 checkpoint "Starting setup script"
 
 mkdir -p "${destination}"
 # Spack resolves a relative view root against the environment directory, not
 # the cwd, so a relative -d would materialize the view under
 # ${destination}/env/${destination}/view once the root below is written into
 # the manifest. Pin it here so everything derived from it is absolute.
 destination="$(cd "${destination}" && pwd)"
 
 echo "Install tag: $tag"
 echo "Install destination: $destination"
 
 if [ -n "${GITLAB_CI:-}" ]; then
     _spack_folder=${CI_PROJECT_DIR}/spack
 else
     _spack_folder=${PWD}/spack
 fi
 
 start_section "Authenticate github.com fetches"
 # Before anything reaches github.com: setup_spack.sh clones spack itself, and
 # the builtin package repo is fetched right after it.
 "${SCRIPT_DIR}/github_auth.sh"
 end_section
 
 start_section "Install spack if not already installed"
 if ! command -v spack &> /dev/null; then
   "${SCRIPT_DIR}/setup_spack.sh" "${_spack_folder}"
   source "${_spack_folder}/share/spack/setup-env.sh"
 fi
 checkpoint "Spack install complete"
 
 _spack_repo_version=${SPACK_REPO_VERSION:-develop}
 _spack_repo_directory="$(realpath "$(spack location --repo builtin)/../../../")"
 
 echo "Ensure builtin repo is synced to commit ${_spack_repo_version}"
 
 git config --global --add safe.directory "${_spack_repo_directory}"
 retry_transient spack repo update builtin --commit "${_spack_repo_version}"
 checkpoint "Spack repository updated"
 
 end_section
 
 if [ -n "${GITLAB_CI:-}" ]; then
   # Use the project spack config for GitLab CI so we can cache it
   mkdir -p ${CI_PROJECT_DIR}/.spack
   ln -s ${CI_PROJECT_DIR}/.spack ${HOME}/.spack
 fi
 
 
 
 if [ -n "${CI:-}" ]; then
   start_section "Add buildcache mirror"
   mirror_name="acts-spack-buildcache"
   mirror_url="oci://ghcr.io/acts-project/spack-buildcache"
   if [ -n "${GITLAB_CI:-}" ]; then
   # Use CERN mirror for non-Github Actions
     mirror_url="oci://registry.cern.ch/ghcr.io/acts-project/spack-buildcache"
   fi
 
   # Check if this buildcache is already configured
   if ! spack mirror list | grep -q ${mirror_name}; then
     echo "Adding buildcache ${mirror_name}"
     spack mirror add ${mirror_name} ${mirror_url} --unsigned
   fi
   # Authenticate GHCR reads to avoid anonymous rate limits (which spack
   # misclassifies as "no binary available"). Idempotent on cached spack installs.
   # GITHUB_TOKEN must be in env when `spack install` later fetches from the mirror.
   if [ -n "${GITHUB_TOKEN:-}" ] && [[ "${mirror_url}" == oci://ghcr.io/* ]]; then
     echo "Setting GHCR credentials on ${mirror_name}"
     spack mirror set \
       --oci-username "${GITHUB_ACTOR:-x-access-token}" \
       --oci-password-variable GITHUB_TOKEN \
       "${mirror_name}"
   fi
   # Verify the mirror config (password-variable stores only the env var name,
   # not the secret value, so this is safe to print).
   spack mirror list
   spack config get mirrors
   end_section
 
   start_section "Add ACTS package repository"
   if ! spack repo list | grep -q "acts"; then
     echo "Adding ACTS package repository from ci-dependencies"
     retry_transient spack repo add https://github.com/acts-project/ci-dependencies.git --path spack_repo/acts
   fi
   echo "Updating ACTS package repository to tag ${tag}"
   retry_transient spack repo update acts --tag "${tag}"
   end_section
 
   start_section "Locate OpenGL"
   "${SCRIPT_DIR}/opengl.sh"
   checkpoint "OpenGL location complete"
   end_section
 fi
 
 start_section "Get spack lock file"
 arch=$(spack arch --family)
 
 env_dir="${destination}/env"
 view_dir="${destination}/view"
 venv_dir="${destination}/venv"
 mkdir -p ${env_dir}
 
 lock_file_path="${destination}/spack.lock"
 cmd=(
     "${SCRIPT_DIR}/select_lockfile.py"
     "--tag" "${tag}"
     "--arch" "${arch}"
     "--cxx" "${cxx_std}"
     "--output" "${lock_file_path}"
 )
 
 if [ "${compiler}" != "default" ]; then
     cmd+=("--compiler-binary" "${compiler}")
 fi
 
 if [ -n "${flavor}" ]; then
     cmd+=("--flavor" "${flavor}")
 fi
 
 "${cmd[@]}"
 
 checkpoint "Lock file prepared"
 
 end_section
 
 
 
 start_section "Create spack environment"
 spack env create -d "${env_dir}" "${lock_file_path}" --with-view "$view_dir"
 # ci-dependencies' own spack.yaml excludes libiconv from its view (see its
 # commit a025501f) because the view's GNU libiconv exports libiconv*, not
 # iconv*, and on macOS DYLD_LIBRARY_PATH outranks a binary's absolute install
 # name -- so it hijacks cmake/ctest/cpack/ccmake, which are built against
 # /usr/lib/libiconv, away from it. That exclude lives in the manifest, not
 # the lockfile, so creating the env straight from spack.lock above loses it
 # regardless of DEPENDENCY_TAG. Re-apply it to the locally generated
 # manifest before the view gets populated below, rather than unsetting
 # DYLD_LIBRARY_PATH for every command: dd4hep's own plugin lookup reads that
 # variable directly (not through dlopen's OS-level resolution), so it still
 # needs the view on it.
 #
 # The colon-path form (`config add view:default:exclude:[libiconv]`) can't
 # do this: view's schema default is a bare bool, and config add errors
 # trying to assign into that regardless of view's current form. `-f <file>`
 # merges a real YAML document instead and does the right thing (verified:
 # installing a spec with this in place drops it from the view while leaving
 # it installed). `-f -` silently no-ops rather than reading stdin, so this
 # needs a real file. `root` has to be repeated here: the view descriptor
 # schema marks it required, so a document carrying only `exclude` is
 # rejected outright.
 view_exclude_config="$(mktemp)"
 cat > "$view_exclude_config" <<YAML
 view:
   default:
     root: ${view_dir}
     exclude:
     - libiconv
 YAML
 spack -e "${env_dir}" config add -f "$view_exclude_config"
 rm -f "$view_exclude_config"
 checkpoint "Spack environment created"
 spack -e "${env_dir}" spec -l
 checkpoint "Spack spec complete"
 spack -e "${env_dir}" find
 checkpoint "Spack find complete"
 end_section
 
 start_section "Install spack packages"
 # Retry to absorb transient GHCR fetch failures (rate limits, network hiccups)
 # when pulling binaries from the buildcache. These usually surface as spack
 # reporting "no binary available" rather than as a network error, so that
 # signature is retried too (see TRANSIENT_ERROR_PATTERNS). Install is
 # idempotent: already-installed specs are skipped on subsequent attempts, so
 # each retry only re-attempts what is still missing and is therefore cheap.
 retry_transient spack -e "${env_dir}" install --fail-fast --use-buildcache only --concurrent-packages 10
 checkpoint "Spack install complete"
 end_section
 
 start_section "Patch up Geant4 data directory"
 if [ "${full_install:-false}" == "true" ]; then
   if ! which uv &> /dev/null ; then
     echo "uv not found, installing uv"
     curl -LsSf https://astral.sh/uv/install.sh | sh
     UV_EXE="/root/.local/bin/uv"
     checkpoint "uv installation complete"
   else
     UV_EXE=$(which uv)
   fi
   $UV_EXE run "$SCRIPT_DIR/download_geant4_datasets.py" -j8 --config "${view_dir}/bin/geant4-config"
   checkpoint "Geant4 datasets download complete"
 fi
 geant4_dir=$(spack -e "${env_dir}" location -i geant4)
 # Prepare the folder for G4 data, and symlink it to where G4 will look for it.
 # `data` itself, not just its parent: geant4.sh does `cd .../share/Geant4/data`
 # and only the full_install path above creates it. Without it the ln below has
 # no existing directory to resolve onto and writes a symlink at the target's own
 # path -- a self-reference that makes every later cd fail with ELOOP.
 mkdir -p "${geant4_dir}/share/Geant4/data"
 [ -e "${view_dir}/share/Geant4/data" ] ||
   ln -s "${geant4_dir}/share/Geant4/data" "${view_dir}/share/Geant4/data"
 end_section
 
 start_section "Prepare python environment"
 "${view_dir}/bin/python3" -m venv --system-site-packages "$venv_dir"
 # NOTE: pip, not uv, on purpose. The venv is deliberately --system-site-packages
 # so that the packages the spack view already provides (numpy and everything
 # built against it) are reused rather than replaced. pip honours that and skips
 # them; uv ignores system site-packages entirely and installs its own PyPI wheel
 # over the top, which silently swaps out the spack-built stack.
 retry_transient "${venv_dir}/bin/python3" -m pip install pyyaml jinja2
 if [ "${full_install:-false}" == "true" ]; then
   retry_transient "${venv_dir}/bin/python3" -m pip install -r "${SCRIPT_DIR}/../../Python/Examples/tests/requirements.txt"
   retry_transient "${venv_dir}/bin/python3" -m pip install histcmp==0.10.0 matplotlib
   retry_transient "${venv_dir}/bin/python3" -m pip install pytest-md-report
 fi
 checkpoint "Python environment prepared"
 end_section
 
 start_section "Set environment variables"
 set_env PATH "${venv_dir}/bin:${view_dir}/bin/:${PATH}"
 # lib64 carries CUDA's own libraries (e.g. cusparse): the view merges
 # packages' lib64/ trees there rather than into lib/, and prebuilt binaries
 # that dlopen them at runtime (rather than being linked with a baked RPATH)
 # need it on the search path too.
 set_env LD_LIBRARY_PATH "${venv_dir}/lib:${view_dir}/lib:${view_dir}/lib64:${view_dir}/lib/root"
 set_env DYLD_LIBRARY_PATH "${venv_dir}/lib:${view_dir}/lib:${view_dir}/lib64:${view_dir}/lib/root"
 # CCCL's CMake configs (Thrust, CUB, libcudacxx) sit under
 # targets/<arch>-linux/lib/cmake, which CMake does not search below a prefix,
 # so find_package(Thrust) misses them. The glob is a no-op without a flavor.
 cmake_prefix_path="${venv_dir}:${view_dir}"
 for cuda_cmake_dir in "${view_dir}"/targets/*/lib/cmake; do
   if [ -d "${cuda_cmake_dir}" ]; then
     cmake_prefix_path="${cmake_prefix_path}:${cuda_cmake_dir}"
   fi
 done
 set_env CMAKE_PREFIX_PATH "${cmake_prefix_path}"
 set_env ROOT_SETUP_SCRIPT "${view_dir}/bin/thisroot.sh"
 set_env ROOT_INCLUDE_PATH "${view_dir}/include"
 # cleanup setup-python mess
 set_env PKG_CONFIG_PATH ""
 set_env pythonLocation ""
 set_env Python_ROOT_DIR ""
 set_env Python2_ROOT_DIR ""
 set_env Python3_ROOT_DIR ""
 end_section
 
 checkpoint "Setup script complete"

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