#!/usr/bin/env bash
# Repo-wide style gate: no em dashes, no tool-attribution phrases in any tracked
# file. Mirrors the .githooks checks, run over the whole tree in CI so a bypassed
# local hook is still caught at merge time.
#
# Portable: BSD-compatible grep, bash 3.2 (macOS) and bash 4+ (CI).

set -u

FAIL=0

# Em dash U+2014, built via printf so this script contains no em-dash byte.
EMDASH=$(printf '\xe2\x80\x94')

# Enforcement files legitimately contain the forbidden phrases in order to
# detect them, so exclude them from the phrase scan.
is_enforcement_file() {
  case "$1" in
    .githooks/*|scripts/check-style.sh|scripts/check-commit-attribution.sh|third_party/rules-swift/core/commits.md|third_party/rules-swift/core/git-discipline.md) return 0 ;;
    *) return 1 ;;
  esac
}

# Tool-attribution phrases. Assembled from fragments so this script does not
# contain the full literal phrases (which would self-flag in other scanners).
TOOL="Cla""ude"
PHRASES=(
  "Co-Authored-By: $TOOL"
  "Co-authored-by: $TOOL"
  "Generated with $TOOL"
  "Generated by $TOOL"
  "Powered by $TOOL"
  "as an AI"
)

# Vendor-neutral attribution: Rule 5.1 covers every AI assistant. Vendor names in
# a list, matched against attribution prefixes, so the gate is tool-agnostic.
AI_VENDORS="Codex Copilot Gemini ChatGPT OpenAI Anthropic Cursor"
AI_PREFIXES='Co-Authored-By:|Co-authored-by:|Generated with|Generated by|with help from|Powered by'

while IFS= read -r f; do
  [ -f "$f" ] || continue
  # The vendored rules-swift corpus is pinned upstream content, not authored here.
  case "$f" in third_party/*) continue ;; esac
  if LC_ALL=C grep -qF -- "$EMDASH" "$f" 2>/dev/null; then
    echo "style: em dash (U+2014) in $f" >&2
    FAIL=1
  fi
  if ! is_enforcement_file "$f"; then
    for p in "${PHRASES[@]}"; do
      if LC_ALL=C grep -qF -- "$p" "$f" 2>/dev/null; then
        echo "style: forbidden attribution phrase in $f" >&2
        FAIL=1
      fi
    done
    # Vendor-neutral attribution (Rule 5.1 covers every assistant, not just Claude).
    for vendor in $AI_VENDORS; do
      if LC_ALL=C grep -qiE -- "($AI_PREFIXES) $vendor" "$f" 2>/dev/null; then
        echo "style: forbidden attribution phrase ($vendor) in $f" >&2
        FAIL=1
      fi
    done
  fi
done < <(git ls-files)

if [ "$FAIL" -ne 0 ]; then
  echo "style: gate failed. Rules: third_party/rules-swift/core/git-discipline.md" >&2
fi

# Roadmap gate (github-discipline: the roadmap check is wired into check-style).
if ! bash scripts/check-roadmap.sh; then
  FAIL=1
fi

exit "$FAIL"