#!/usr/bin/env sh
set -eu

# Sync TSL Playbook snapshot to project root.
# - Copies docs/standards/tsl_playbook/.agents -> .agents
# - Copies docs/standards/tsl_playbook/.gitattributes -> .gitattributes
# Existing targets are backed up before overwrite.

ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"
SRC="$ROOT/docs/standards/tsl_playbook"
AGENTS_SRC="$SRC/.agents"
GITATTR_SRC="$SRC/.gitattributes"

if [ ! -d "$AGENTS_SRC" ]; then
  echo "ERROR: Playbook snapshot not found at $AGENTS_SRC" >&2
  echo "Run: git subtree add --prefix docs/standards/tsl_playbook <playbook-url> main --squash" >&2
  exit 1
fi

timestamp="$(date +%Y%m%d%H%M%S 2>/dev/null || echo bak)"

AGENTS_DST="$ROOT/.agents"
if [ -e "$AGENTS_DST" ]; then
  mv "$AGENTS_DST" "$ROOT/.agents.bak.$timestamp"
  echo "Backed up existing .agents -> .agents.bak.$timestamp"
fi
cp -R "$AGENTS_SRC" "$AGENTS_DST"

echo "Synced .agents from Playbook." 

if [ -f "$GITATTR_SRC" ]; then
  GITATTR_DST="$ROOT/.gitattributes"
  if [ -e "$GITATTR_DST" ]; then
    mv "$GITATTR_DST" "$ROOT/.gitattributes.bak.$timestamp"
    echo "Backed up existing .gitattributes -> .gitattributes.bak.$timestamp"
  fi
  cp "$GITATTR_SRC" "$GITATTR_DST"
  echo "Synced .gitattributes from Playbook."
fi

echo "Done."