#!/usr/bin/env bash
# Discover build/test/benchmark entry points from common manifests.
# No Minecraft-hardcoded commands — agent/caller repos vary.
set -euo pipefail

ROOT="${GATEKEEP_ROOT:-.}"
OUT_DIR="$ROOT/.gatekeep/out"
mkdir -p "$OUT_DIR"

json_escape() {
  python3 -c 'import json,sys; print(json.dumps(sys.stdin.read()))' <<<"$1"
}

entries=()

add() {
  local kind="$1" cmd="$2" src="$3"
  entries+=("{\"kind\":$(json_escape "$kind"),\"command\":$(json_escape "$cmd"),\"source\":$(json_escape "$src")}")
}

if [[ -f "$ROOT/package.json" ]]; then
  # Prefer known script names without requiring jq
  for s in test check lint build verify bench benchmark start; do
    if python3 - "$ROOT/package.json" "$s" <<'PY'
import json,sys
p=json.load(open(sys.argv[1]))
scripts=p.get("scripts") or {}
sys.exit(0 if sys.argv[2] in scripts else 1)
PY
    then
      add "npm:$s" "npm run $s" "package.json"
    fi
  done
fi

if [[ -f "$ROOT/Makefile" ]]; then
  for t in test check verify bench benchmark build; do
    if grep -qE "^${t}[[:space:]]*:" "$ROOT/Makefile"; then
      add "make:$t" "make $t" "Makefile"
    fi
  done
fi

if [[ -f "$ROOT/gradlew" ]]; then
  add "gradle:test" "./gradlew test" "gradlew"
  add "gradle:build" "./gradlew build" "gradlew"
fi

if [[ -f "$ROOT/pom.xml" ]]; then
  add "mvn:test" "mvn -B test" "pom.xml"
fi

if [[ -f "$ROOT/Cargo.toml" ]]; then
  add "cargo:test" "cargo test" "Cargo.toml"
  add "cargo:bench" "cargo bench" "Cargo.toml"
fi

if [[ -f "$ROOT/go.mod" ]]; then
  add "go:test" "go test ./..." "go.mod"
fi

if [[ -f "$ROOT/pyproject.toml" ]] || [[ -f "$ROOT/pytest.ini" ]]; then
  add "pytest" "pytest -q" "python"
fi

# README hints (non-executing notes for the model/verify layer)
readme_hints=""
for f in README.md README.rst docs/README.md; do
  if [[ -f "$ROOT/$f" ]]; then
    readme_hints+=$(grep -iE '^(#+ ).*(test|build|bench|verify|ci)' "$ROOT/$f" | head -20 || true)
    readme_hints+=$'\n'
  fi
done

joined=$(IFS=,; echo "${entries[*]}")
discover_json="{\"entries\":[${joined}],\"readme_hints\":$(json_escape "$readme_hints")}"
printf '%s\n' "$discover_json" > "$OUT_DIR/discover.json"

if [[ -n "${GITHUB_OUTPUT:-}" ]]; then
  {
    echo "discover_json<<GATEKEEP_EOF"
    echo "$discover_json"
    echo "GATEKEEP_EOF"
  } >> "$GITHUB_OUTPUT"
fi

echo "Discovered ${#entries[@]} entry point(s)" >&2