#!/usr/bin/env bash
# Keep required jobs alive; only skip reviewed non-runtime documentation paths.
set -euo pipefail
base="${DELIVERY_BASE:-}"
head="$(git rev-parse HEAD)"
run=true
if [[ "${DELIVERY_REF:-}" != refs/tags/* && "$head" == "${DELIVERY_SHA:-}" && "${DELIVERY_EVENT:-}" =~ ^(push|pull_request)$ && "$base" =~ ^[0-9a-f]{40}$ && "$base" != 0000000000000000000000000000000000000000 ]]; then
  if ! git cat-file -e "$base^{commit}" 2>/dev/null; then
    if [[ -n "${DELIVERY_FETCH_TOKEN:-}" ]]; then
      git -c "http.extraHeader=Authorization: token ${DELIVERY_FETCH_TOKEN}" fetch --quiet --depth=1 origin "$base" >/dev/null 2>&1 || true
    else
      git fetch --quiet --depth=1 origin "$base" >/dev/null 2>&1 || true
    fi
  fi
  if git cat-file -e "$base^{commit}" 2>/dev/null; then
    paths="$(mktemp)"
    trap 'rm -f -- "$paths"' EXIT
    # Snapshot comparison is conservative when main advanced during a PR.
    # Both rename sides remain visible, including names containing newlines.
    if git diff --no-renames --name-only -z "$base" "$head" > "$paths"; then
      run=false
      while IFS= read -r -d '' path; do
        case "$path" in
          README.md|CHANGELOG.md|LICENSE|LICENSE.md) ;;
          *) run=true; break ;;
        esac
      done < "$paths"
    fi
  fi
fi
if [[ "$run" == false ]]; then
  echo 'Only reviewed non-runtime documentation changed; build and validation are not applicable.'
else
  echo 'Runtime, unknown inputs, or unavailable event history: run required validation.'
fi
if [[ -n "${GITHUB_OUTPUT:-}" ]]; then
  echo "run=$run" >> "$GITHUB_OUTPUT"
fi
printf '%s\n' "$run"