#!/usr/bin/env bash
# Row 82 (#1551): rerun the listRuns mutants against a tree. Usage:
# mutants.sh <tree>. The tree needs the candidate's listRuns; its tests can
# be the candidate's or the base's. Each mutant drops one string check in
# listRuns (scripts/mosaic-task.mjs), putting back that field's base line,
# runs the runs suite, 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"
SRC=scripts/mosaic-task.mjs
run_tests() { node --test 'packages/runs/tests/*.test.mjs' >"$1" 2>&1; }

# name | sed expression
MUTANTS=(
  'status-unchecked|s/^      if (typeof result\.status === "string") status = result\.status;$/      status = result.status;/'
  'taskid-unchecked|s/^      if (typeof result\.taskId === "string") taskId = result\.taskId;$/      taskId = result.taskId;/'
  'workspace-unchecked|s/^      if (typeof result\.workspace === "string") workspace = result\.workspace;$/      workspace = String(result.workspace ?? "-");/'
  'session-unchecked|s/^      if (typeof result\.session === "string") session = result\.session;$/      session = result.session ?? "-";/'
)

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 <<<"$m"
  cp -p "$SRC" "$OUT/orig"
  sed -i -e "$expr" "$SRC"
  if cmp -s "$OUT/orig" "$SRC"; then
    echo "$name: NOT APPLIED (sed matched nothing)"; status=1; continue
  fi
  diff -u "$OUT/orig" "$SRC" >"$OUT/$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 "$OUT/orig" "$SRC"
  cmp -s "$OUT/orig" "$SRC" || { echo "restore failed: $SRC" >&2; exit 1; }
  rm -f "$OUT/orig"
done
exit "$status"