#!/bin/sh
set -eu

repo=$(git rev-parse --show-toplevel)
checker="/home/wait4x/.pi/agent/skills/spec/scripts/check_all_spec_packages.py"
# Checker resolution:
#   1. SPEC_CHECK_ALL_SCRIPT environment override — the explicit operator
#      escape hatch; the path in effect is echoed to stderr so a swap is
#      never silent.
#   2. The absolute path rendered by install_git_hooks.py, already held in
#      $checker when the placeholder above was replaced. Repository content
#      can never replace the gate checker; an unrendered template fails
#      closed below.
if [ -n "${SPEC_CHECK_ALL_SCRIPT:-}" ]; then
  checker="$SPEC_CHECK_ALL_SCRIPT"
  printf '%s\n' "spec gate: using SPEC_CHECK_ALL_SCRIPT override: $checker" >&2
fi

if [ ! -f "$checker" ]; then
  printf '%s\n' \
    "error: Spec gate checker not found at: $checker" \
    "  The checker script is expected at the path above." \
    "  Fix:" \
    "    1. Re-run: python3 scripts/install_git_hooks.py --root \"$repo\"" \
    "    2. The checker lives in the spec skill package under scripts/" >&2
  exit 1
fi

python="/home/wait4x/miniconda3/bin/python3.13"
python_placeholder_prefix=__SPEC_PYTHON_
python_placeholder="${python_placeholder_prefix}PLACEHOLDER__"
if [ "$python" = "$python_placeholder" ]; then
  python=${SPEC_PYTHON:-$(command -v python3 || true)}
fi
if [ -z "$python" ]; then
  printf '%s\n' "error: Spec gate requires a trusted Python interpreter" >&2
  exit 1
fi
if [ "$python" != "${python##*/}" ] && [ ! -x "$python" ]; then
  printf '%s\n' "error: Spec gate requires a trusted Python interpreter" >&2
  exit 1
fi

mode=${SPEC_PUSH_GATE:-touched}
case "$mode" in
  touched|all) ;;
  *) printf '%s\n' "error: SPEC_PUSH_GATE must be touched or all" >&2; exit 1 ;;
esac
zero=0000000000000000000000000000000000000000
tmp_dir=$(mktemp -d "${TMPDIR:-/tmp}/spec-pre-push.XXXXXX")
baseline_ref="refs/spec-gate/legacy-baseline-$$"
cleanup() {
  git update-ref -d "$baseline_ref" >/dev/null 2>&1 || true
  rm -rf "$tmp_dir"
}
trap cleanup EXIT HUP INT TERM
remote_name=${1:-}
legacy_baseline=$zero
if [ -n "$remote_name" ]; then
  main_branch=${SPEC_MAIN_BRANCH:-}
  if [ -z "$main_branch" ]; then
    symref=$(git ls-remote --symref "$remote_name" HEAD) \
      || { printf '%s\n' "error: cannot resolve authoritative remote HEAD for $remote_name" >&2; exit 1; }
    main_branch=$(printf '%s\n' "$symref" | sed -n 's#^ref: refs/heads/\([^[:space:]]*\)[[:space:]]*HEAD$#\1#p' | sed -n '1p')
    main_branch=${main_branch:-main}
  fi
  remote_main=$(git ls-remote --heads "$remote_name" "refs/heads/$main_branch") \
    || { printf '%s\n' "error: cannot resolve authoritative $remote_name/$main_branch" >&2; exit 1; }
  legacy_baseline=$(printf '%s\n' "$remote_main" | sed -n 's/[[:space:]].*$//p' | sed -n '1p')
  legacy_baseline=${legacy_baseline:-$zero}
  if [ "$legacy_baseline" != "$zero" ]; then
    git fetch --no-tags "$remote_name" "+refs/heads/$main_branch:$baseline_ref" >/dev/null 2>&1 \
      || { printf '%s\n' "error: cannot fetch authoritative $remote_name/$main_branch baseline" >&2; exit 1; }
    fetched_baseline=$(git rev-parse --verify "$baseline_ref^{commit}") \
      || { printf '%s\n' "error: authoritative remote-main baseline object is unavailable" >&2; exit 1; }
    [ "$fetched_baseline" = "$legacy_baseline" ] \
      || { printf '%s\n' "error: authoritative remote-main baseline changed during pre-push" >&2; exit 1; }
  fi
fi
specs_args=""
if [ -n "${SPEC_SPECS_DIRS:-}" ]; then
  old_ifs=$IFS
  IFS=,
  for specs_dir in $SPEC_SPECS_DIRS; do
    case "$specs_dir" in
      ''|*[!A-Za-z0-9._/-]*)
        printf '%s\n' "error: SPEC_SPECS_DIRS must be comma-separated trusted relative paths" >&2
        exit 1
        ;;
    esac
    specs_args="$specs_args --specs-dir $specs_dir"
  done
  IFS=$old_ifs
fi
input_path=$tmp_dir/refs
cat >"$input_path"
index=0

while read -r local_ref local_sha remote_ref remote_sha; do
  [ -n "${local_sha:-}" ] || continue
  [ "$local_sha" = "$zero" ] && continue
  case "$remote_ref" in
    refs/heads/spec/*)
      # AUD-07: in-flight handoff. Integration branches carry work in
      # progress (WIP commits, handoff.md) through the remote; the
      # irreversible path is the main-branch merge, which keeps the full
      # gate below.
      printf '%s\n' \
        "spec gate: releasing in-flight push of $remote_ref (integration-branch handoff);" \
        "the full gate applies when this work merges to the main branch" >&2
      continue
      ;;
  esac
  index=$((index + 1))
  files_path=$tmp_dir/files-$index
  commits_path=$tmp_dir/commits-$index
  footer_slugs=$tmp_dir/footer-slugs-$index
  footer_window_base=""
  : >"$files_path"
  : >"$commits_path"
  : >"$footer_slugs"

  if [ "$remote_sha" = "$zero" ]; then
    git log --name-only --pretty=format: "$local_sha" --not --remotes >"$files_path" \
      || { printf '%s\n' "error: cannot enumerate files for pushed ref $local_ref" >&2; exit 1; }
    git rev-list --no-merges "$local_sha" --not --remotes >"$commits_path" \
      || { printf '%s\n' "error: cannot enumerate commits for pushed ref $local_ref" >&2; exit 1; }
  else
    git diff --name-only "$remote_sha" "$local_sha" >"$files_path" \
      || { printf '%s\n' "error: cannot diff pushed ref $local_ref" >&2; exit 1; }
    git rev-list --no-merges "$remote_sha..$local_sha" >"$commits_path" \
      || { printf '%s\n' "error: cannot enumerate commits for pushed ref $local_ref" >&2; exit 1; }
  fi

  # shellcheck disable=SC2086
  scope=$($python "$checker" --root "$repo" --scope-paths-file "$files_path" $specs_args) \
    || { printf '%s\n' "error: cannot derive trusted Spec scope for $local_ref" >&2; exit 1; }
  touched_slugs=$(printf '%s\n' "$scope" | sed -n 's/^SPEC //p')

  if [ -z "$touched_slugs" ]; then
    while read -r commit; do
      [ -n "$commit" ] || continue
      message=$(git show -s --format=%B "$commit" 2>/dev/null || true)
      slugs=$(printf '%s\n' "$message" | sed -nE 's/^Spec:[[:space:]]*([a-z0-9][a-z0-9_-]*[a-z0-9]|[a-z0-9])[[:space:]]*$/\1/p')
      if printf '%s\n' "$message" | grep -qE '^Spec:[[:space:]]*none[[:space:]]*(\([[:space:]]*\))?[[:space:]]*$'; then
        printf '%s\n' \
          "error: pushed commit ${commit}: 'Spec: none' lite channel requires a non-empty reason" \
          "  Write 'Spec: none (<reason>)' in the commit footer and retry." >&2
        exit 1
      fi
      if [ -z "$slugs" ]; then
        # F11 lite channel: `Spec: none (<non-empty reason>)` attributes a
        # trivial unpackaged commit. It contributes no package slug, so a
        # none-only push skips the package gate below; the full gate still
        # applies to every slug-attributed commit in the same ref.
        if printf '%s\n' "$message" | grep -qE '^Spec:[[:space:]]*none[[:space:]]*\([^()]+\)[[:space:]]*$'; then
          continue
        fi
        printf '%s\n' \
          "error: pushed commit ${commit} has no Spec: <slug> attribution" \
          "  Retro-pack the work into a completed Development Record and amend the commit with its Spec footer," \
          "  or attribute trivial unpackaged work with 'Spec: none (<reason>)', and retry." >&2
        exit 1
      fi
      printf '%s\n' "$slugs" >>"$footer_slugs"
    done <"$commits_path"
    touched_slugs=$(sort -u "$footer_slugs")
    # F9 (AUD-06): footer-attributed pushes carry the push-window base so the
    # single judge inside check_all can warn (observation period) when a cited
    # archive's recorded commit interval predates this delivery window.
    if [ "$remote_sha" != "$zero" ]; then
      footer_window_base=$(git merge-base "$remote_sha" "$local_sha" 2>/dev/null || true)
    fi
  fi

  # A ref deletion, or a ref with no new commits/files, has nothing to gate.
  [ -n "$touched_slugs" ] || continue

  set --
  if [ "$mode" != "all" ]; then
    for slug in $touched_slugs; do
      set -- "$@" --slug "$slug"
    done
  fi
  if [ -n "$footer_window_base" ]; then
    set -- "$@" --footer-window-base "$footer_window_base"
  fi
  # shellcheck disable=SC2086
  set -- "$@" $specs_args
  set -- "$@" --legacy-baseline "$legacy_baseline"
  "$python" "$checker" --root "$repo" --revision "$local_sha" --require-archived "$@"
done <"$input_path"