#!/usr/bin/env bash
# gstack-routing-config — read shared routing config for cross-runtime skill routing
# Usage: gstack-routing-config [check|read]
#
# check: exits 0 if routing config exists, 1 if not
# read: outputs routing rules as structured text
#
# Reads from ~/.gstack/routing.yaml (shared between gstack + OpenClaw).
# Falls back to CLAUDE.md/AGENTS.md "## Skill routing" section.
set -euo pipefail

GSTACK_HOME="${GSTACK_HOME:-$HOME/.gstack}"
ROUTING_FILE="$GSTACK_HOME/routing.yaml"
CMD="${1:-check}"

case "$CMD" in
  check)
    if [ -f "$ROUTING_FILE" ]; then
      echo "ROUTING_CONFIG: $ROUTING_FILE"
      exit 0
    fi
    # Fallback: check CLAUDE.md or AGENTS.md
    for f in CLAUDE.md AGENTS.md; do
      if [ -f "$f" ] && grep -q "## Skill routing" "$f" 2>/dev/null; then
        echo "ROUTING_CONFIG: $f (embedded)"
        exit 0
      fi
    done
    echo "NO_ROUTING_CONFIG"
    exit 1
    ;;

  read)
    if [ -f "$ROUTING_FILE" ]; then
      cat "$ROUTING_FILE"
      exit 0
    fi
    # Fallback: extract routing section from CLAUDE.md or AGENTS.md
    for f in CLAUDE.md AGENTS.md; do
      if [ -f "$f" ] && grep -q "## Skill routing" "$f" 2>/dev/null; then
        # Extract from "## Skill routing" to next "## " heading or EOF
        bun -e "
          const text = await Bun.file('$f').text();
          const start = text.indexOf('## Skill routing');
          if (start === -1) process.exit(1);
          const rest = text.slice(start);
          const end = rest.indexOf('\n## ', 1);
          console.log(end > 0 ? rest.slice(0, end).trim() : rest.trim());
        " 2>/dev/null || true
        exit 0
      fi
    done
    echo "NO_ROUTING_CONFIG"
    exit 1
    ;;

  *)
    echo "Usage: gstack-routing-config [check|read]" >&2
    exit 1
    ;;
esac