#!/usr/bin/env sh
# Sync PLAYBOOK.md from the canonical repo into this project.
#
#   - Shows the diff and asks before applying — never silently swaps the rules out.
#   - Never edits upstream. Fix rules in the canonical repo, bump its VERSION, then sync (§16).
#   - Don't run this mid-release. Finish shipping, then sync.
#
# Requires: gh (private repo) or curl (public raw URL).
set -e

REPO="Maaggel/Playbook"
BRANCH="main"
FILE="PLAYBOOK.md"

fetch() {
  # Private repo → use the authenticated gh CLI. (For a public repo, curl the raw URL instead.)
  gh api "repos/$REPO/contents/$FILE?ref=$BRANCH" \
    -H "Accept: application/vnd.github.raw" > "$1"
}

fetch .playbook.new

if cmp -s "$FILE" .playbook.new 2>/dev/null; then
  echo "Playbook is up to date."
  rm .playbook.new
  exit 0
fi

echo "--- changes from the canonical playbook ---"
diff -u "$FILE" .playbook.new || true

printf '\nApply this update? [y/N] '
read -r ans
if [ "$ans" != "y" ] && [ "$ans" != "Y" ]; then
  rm .playbook.new
  echo "Left unchanged."
  exit 1
fi

mv .playbook.new "$FILE"
echo "Synced. Commit it on its own so the change is easy to see."