#!/usr/bin/env bash
# Show how far a game's shared files have drifted from the kit's template.
#   ./drift.sh <game-dir> [slug]     e.g. ./drift.sh ../waving-hands waving-hands
# Files are paired by drift-map/<slug>.txt when a game's layout differs from
# the template's ("template/path game/path" per line); otherwise the same
# path is compared. Placeholders are filled with the slug before diffing, so
# only real divergence shows. Prints changed lines per file, then the total.
set -euo pipefail
GAME="${1:?usage: drift.sh <game-dir> [slug]}"
SLUG="${2:-$(basename "$(cd "$GAME" && pwd)")}"
KIT="$(cd "$(dirname "$0")" && pwd)"
MAP="$KIT/drift-map/$SLUG.txt"
SHARED="server/src/index.ts server/src/rooms.ts server/src/store.ts server/src/reports.ts server/src/ratelimit.ts
src/lib/net/client.ts src/lib/net/talk.ts src/lib/components/TableTalk.svelte src/lib/components/ReportSlip.svelte
deploy/deploy.sh deploy/setup-droplet.sh deploy/setup-server.sh deploy/Caddyfile.tmpl deploy/verify-ledgers.sh
deploy/replay-ledgers.ts deploy/pulse.sh deploy/visitors.sh deploy/sentry-slack-alert.sh deploy/pull-reports.sh deploy/report-reply.sh
deploy/__SLUG__.service deploy/__SLUG__.cron deploy/__SLUG__-backup.sh deploy/__SLUG__-rollup.sh"
total=0
for t in $SHARED; do
  g="$t"
  if [ -f "$MAP" ]; then
    m=$(awk -v t="$t" '$1 == t { print $2 }' "$MAP")
    [ -n "$m" ] && g="$m"
  fi
  g="${g//__SLUG__/$SLUG}"
  if [ ! -f "$GAME/$g" ]; then printf '%-44s %s\n' "$t" "missing in game ($g)"; continue; fi
  n=$(diff <(sed -e "s/__SLUG__/$SLUG/g" "$KIT/template/$t") "$GAME/$g" | grep -c '^[<>]' || true)
  total=$((total + n))
  printf '%-44s %4d lines differ\n' "$t" "$n"
done
echo "total: $total lines differ from the template"