#!/usr/bin/env bash
# Headless fallback runner (burns more subscription credit than in-session subagents).
# Usage: run-headless <S1..S6> <model> <workdir> [results.tsv]
set -euo pipefail

SCENARIO="${1:?usage: run-headless <scenario> <model> <workdir> [results.tsv]}"
MODEL="${2:?model required (haiku|sonnet|opus)}"
WORKDIR="${3:?workdir required}"
RESULTS="${4:-$WORKDIR/results.tsv}"

EVAL_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
PLUGIN_ROOT="$(cd "$EVAL_ROOT/.." && pwd)"
SANDBOX="$WORKDIR/$SCENARIO-$MODEL-$(date +%s)"

case "$SCENARIO" in
  S1|S2) SKILL=create ;;
  S3|S4) SKILL=find ;;
  S5)    SKILL=init ;;
  S6)    SKILL=migrate ;;
  *) echo "unknown scenario $SCENARIO" >&2; exit 2 ;;
esac

"$EVAL_ROOT/bin/sandbox" "$SCENARIO" "$SANDBOX" >/dev/null
TASK="$(awk '/^## Task/{found=1; next} found' "$EVAL_ROOT/scenarios/$SCENARIO.md")"

PROMPT="$(awk '/^---$/{found=1; next} found' "$EVAL_ROOT/runner-prompt.md" \
  | sed -e "s|{{SANDBOX}}|$SANDBOX|g" \
        -e "s|{{PLUGIN_ROOT}}|$PLUGIN_ROOT|g" \
        -e "s|{{SKILL}}|$SKILL|g")"
PROMPT="${PROMPT//\{\{TASK\}\}/$TASK}"

(cd "$SANDBOX" && claude -p --model "$MODEL" --dangerously-skip-permissions "$PROMPT")

"$EVAL_ROOT/bin/check" "$SCENARIO" "$SANDBOX" --tsv "$MODEL" | tee -a "$RESULTS"