#!/usr/bin/env bash
# The autofixing pre-commit hooks must leave apm's own output byte-identical.
#
# apm owns four tracked files, and `apm audit --ci` diffs them byte-for-byte
# against a replayed install. If an autofixing hook rewrites any of them, the
# pre-push gate reports drift on a file that has no git diff. This suite runs
# the repo's real autofix hooks, with the real args and the real `exclude:` from
# .pre-commit-config.yaml, over copies of those four files and asserts nothing
# changes. A file the config excludes passes trivially; a file it leaves in scope
# must survive the formatter untouched, which is what fails if `--no-sort-keys`
# is ever dropped.
set -euo pipefail

REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
PASS=0
FAIL=0

pass() { echo "  PASS: $1"; PASS=$((PASS + 1)); }
fail() { echo "  FAIL: $1"; FAIL=$((FAIL + 1)); }

# exit 77 (automake convention; run-tests.sh renders it as SKIPPED, and
# --strict turns that into a setup error at the pre-push gate).
command -v git > /dev/null 2>&1 || { echo "SKIP: git is required"; exit 77; }
command -v pre-commit > /dev/null 2>&1 || { echo "SKIP: pre-commit is required to run pretty-format-json"; exit 77; }
command -v python3 > /dev/null 2>&1 || { echo "SKIP: python3 is required to read .pre-commit-config.yaml"; exit 77; }
python3 -c 'import yaml' > /dev/null 2>&1 || { echo "SKIP: PyYAML is required to read .pre-commit-config.yaml"; exit 77; }

TOOL_OWNED=(
  .claude/settings.json
  .claude/apm-hooks.json
  .claude-plugin/marketplace.json
  apm.lock.yaml
)
HOOK_IDS="pretty-format-json,end-of-file-fixer,trailing-whitespace"

WORK="$(mktemp -d)"
trap 'rm -rf "$WORK"' EXIT

# Derive the fixture config from the real one so the args under test are the
# repo's, not a copy that can drift. `stages:` is dropped so the hooks run under
# a plain `pre-commit run`.
if ! python3 - "$REPO_ROOT/.pre-commit-config.yaml" "$HOOK_IDS" "$WORK/pre-commit-config.yaml" << 'PY'
import sys
import yaml

src, ids, dest = sys.argv[1], set(sys.argv[2].split(",")), sys.argv[3]
cfg = yaml.safe_load(open(src))
repos = []
for repo in cfg["repos"]:
    hooks = [dict(h) for h in repo.get("hooks", []) if h["id"] in ids]
    if not hooks:
        continue
    for h in hooks:
        h.pop("stages", None)
    repos.append({"repo": repo["repo"], "rev": repo["rev"], "hooks": hooks})
found = {h["id"] for r in repos for h in r["hooks"]}
missing = ids - found
if missing:
    sys.exit("hooks not found in .pre-commit-config.yaml: " + ", ".join(sorted(missing)))
yaml.safe_dump({"repos": repos}, open(dest, "w"))
PY
then
  echo "ERROR: could not derive the fixture config"
  exit 1
fi

# pre-commit clones a hook repo once and caches it; without the cache this
# would need the network, which is a setup problem, not a regression.
HOOK_REPO="$(python3 -c 'import yaml,sys; print(yaml.safe_load(open(sys.argv[1]))["repos"][0]["repo"])' "$WORK/pre-commit-config.yaml")"
HOOK_REV="$(python3 -c 'import yaml,sys; print(yaml.safe_load(open(sys.argv[1]))["repos"][0]["rev"])' "$WORK/pre-commit-config.yaml")"
CACHE_DB="${PRE_COMMIT_HOME:-${XDG_CACHE_HOME:-$HOME/.cache}/pre-commit}/db.db"
if ! python3 - "$CACHE_DB" "$HOOK_REPO" "$HOOK_REV" << 'PY' > /dev/null 2>&1
import sqlite3, sys
db, repo, rev = sys.argv[1:4]
row = sqlite3.connect(db).execute("select 1 from repos where repo=? and ref=?", (repo, rev)).fetchone()
sys.exit(0 if row else 1)
PY
then
  echo "SKIP: $HOOK_REPO@$HOOK_REV is not in the pre-commit cache; run the hooks once with network access"
  exit 77
fi

mkdir -p "$WORK/repo"
cd "$WORK/repo"
git init -q .
git config user.email test@example.invalid
git config user.name test
cp "$WORK/pre-commit-config.yaml" .pre-commit-config.yaml
for f in "${TOOL_OWNED[@]}"; do
  mkdir -p "$(dirname "$f")"
  cp "$REPO_ROOT/$f" "$f"
done
git add -A

echo ""
echo "--- autofix hooks leave apm-owned files byte-identical ---"
RC=0
pre-commit run --all-files > "$WORK/hooks.out" 2>&1 || RC=$?

for f in "${TOOL_OWNED[@]}"; do
  if cmp -s "$REPO_ROOT/$f" "$f"; then
    pass "$f is unchanged by $HOOK_IDS"
  else
    fail "$f was rewritten by an autofixing hook -- apm audit --ci would report drift"
    diff "$REPO_ROOT/$f" "$f" | sed 's/^/    /' | head -20 || true
  fi
done

if [[ "$RC" -eq 0 ]]; then
  pass "pre-commit exits 0 over the tool-owned files"
else
  fail "pre-commit exited $RC over the tool-owned files"
  sed 's/^/    /' "$WORK/hooks.out"
fi

echo ""
echo "Results: $PASS passed, $FAIL failed"
[[ "$FAIL" -eq 0 ]]