#!/usr/bin/env bash
# test-patch-sanity.sh — unit test for verify-patch-sanity.py (the malformed-
# patch detector + recount fixer). Zero network.
set -u
DIR="$(cd "$(dirname "$0")" && pwd)"
LINT="$DIR/verify-patch-sanity.py"
T="$(mktemp -d)"; trap 'rm -rf "$T"' EXIT
PASS=0; FAIL=0
ok(){ PASS=$((PASS+1)); printf '  ok   %s\n' "$1"; }
no(){ FAIL=$((FAIL+1)); printf '  FAIL %s\n     %s\n' "$1" "${2:-}"; }

# a WELL-FORMED patch (counts match body: 3 old / 4 new)
cat > "$T/good.patch" <<'EOF'
--- a/f.c
+++ b/f.c
@@ -1,3 +1,4 @@
 a
+b
 c
 d
EOF

# a MALFORMED patch: header says +1,7 but only 4 new lines present (the fatal class)
cat > "$T/bad.patch" <<'EOF'
--- a/f.c
+++ b/f.c
@@ -1,3 +1,7 @@
 a
+b
 c
 d
EOF

# an EMPTY placeholder (no hunks) — must NOT be flagged
: > "$T/empty.patch"

python3 "$LINT" --quiet "$T/good.patch" >/dev/null 2>&1 && ok "well-formed passes" || no "well-formed passes"
python3 "$LINT" --quiet "$T/bad.patch"  >/dev/null 2>&1 && no "malformed detected" "bad.patch not flagged" || ok "malformed detected"
python3 "$LINT" --quiet "$T/empty.patch" >/dev/null 2>&1 && ok "empty placeholder not flagged" || no "empty placeholder not flagged"

# --fix must repair the count-only malformation and make it pass
python3 "$LINT" --fix "$T/bad.patch" >/dev/null 2>&1
python3 "$LINT" --quiet "$T/bad.patch" >/dev/null 2>&1 && ok "--fix repairs count error" || no "--fix repairs count error"
grep -q '@@ -1,3 +1,4 @@' "$T/bad.patch" && ok "--fix recounted header to +1,4" || no "--fix recounted header" "$(grep '@@' "$T/bad.patch")"
# --fix must not touch the body
grep -qx '+b' "$T/bad.patch" && ok "--fix left the body intact" || no "--fix left body intact"

echo "  PASS: $PASS  FAIL: $FAIL"
[ "$FAIL" -eq 0 ] && { echo "  ALL GREEN"; exit 0; } || exit 1