#!/usr/bin/env bash
# Row 78 (#1572): rerun the mutants against a tree. Usage: mutants.sh <tree>.
# Each mutant makes one check in scripts/bus-service.sh skip the default pin
# (no --claude) while still applying to --claude, runs the cli host tests,
# and restores the file from a saved copy, so the tree need not be
# committed. Prints "killed" or "SURVIVED" per mutant; exit 1 if any
# survives, a sed doesn't change the file, or the unmutated run fails.
set -euo pipefail
TREE="$(cd "${1:?usage: mutants.sh <tree>}" && pwd)"
cd "$TREE"
SCRIPT=scripts/bus-service.sh
TESTS=(packages/cli/tests/host.test.mjs)
run_tests() { node --test "${TESTS[@]}" >"$1" 2>&1; }

# name | sed expression
MUTANTS=(
  'default-skips-exec-check|s/^    \[ -f "\$bin" \] && \[ -x "\$bin" \] || die /    [ "$CLAUDE_SET" = 0 ] || { [ -f "$bin" ] \&\& [ -x "$bin" ]; } || die /'
  'default-skips-char-check|s/^    case "\$bin" in \*\[!A-Za-z0-9\/._+-\]\*) die /    case "$bin" in *[!A-Za-z0-9\/._+-]*) [ "$CLAUDE_SET" = 0 ] || die /'
)

OUT="${OUT:-$TREE/.mutants}"
mkdir -p "$OUT"
run_tests "$OUT/baseline.log" || { echo "baseline run failed: $OUT/baseline.log" >&2; exit 1; }
echo "baseline: pass"
status=0
for m in "${MUTANTS[@]}"; do
  IFS='|' read -r name expr <<<"$m"
  cp -p "$SCRIPT" "$OUT/orig"
  sed -i -e "$expr" "$SCRIPT"
  if cmp -s "$OUT/orig" "$SCRIPT"; then
    echo "$name: NOT APPLIED (sed matched nothing)"; status=1; continue
  fi
  diff -u "$OUT/orig" "$SCRIPT" >"$OUT/$name.diff" || true
  if run_tests "$OUT/$name.log"; then
    echo "$name: SURVIVED"; status=1
  else
    echo "$name: killed ($(grep -E '^✖' "$OUT/$name.log" | grep -v 'failing tests' | sed 's/ ([0-9.]*ms)$//' | sort -u | tr '\n' ';'))"
  fi
  cp -p "$OUT/orig" "$SCRIPT"
  cmp -s "$OUT/orig" "$SCRIPT" || { echo "restore failed: $SCRIPT" >&2; exit 1; }
  rm -f "$OUT/orig"
done
exit "$status"