#!/usr/bin/env bash
# Sync canonical docker-prep.template.sh into every product repo's scripts/docker-prep.sh.
# Mirrors scripts/sync-npmrc.sh pattern.
#
# Usage:
#   bash scripts/sync-docker-prep.sh                 # sync all known consumers
#   bash scripts/sync-docker-prep.sh --check         # exit 1 if any drift
#   bash scripts/sync-docker-prep.sh --repo PATH     # sync just one repo

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
TEMPLATE="$SCRIPT_DIR/docker-prep.template.sh"
COMMON_PLAT="$(cd "$SCRIPT_DIR/.." && pwd)"
SIBLING_ROOT="$(cd "$COMMON_PLAT/.." && pwd)"

CHECK_ONLY=false
SINGLE_REPO=""
while [ $# -gt 0 ]; do
  case "$1" in
    --check) CHECK_ONLY=true ;;
    --repo) SINGLE_REPO="${2:-}"; shift ;;
    -h|--help) sed -n '2,11p' "$0" | sed 's/^# \{0,1\}//'; exit 0 ;;
    *) echo "Unknown arg: $1" >&2; exit 2 ;;
  esac
  shift
done

if [ ! -f "$TEMPLATE" ]; then
  echo "✗ Template not found: $TEMPLATE" >&2; exit 1
fi

# Repos that consume docker-prep.sh (have scripts/docker-prep.sh today)
CONSUMERS=(
  "learning_ai_clock"
  "learning_ai_peakpulse"
  "learning_ai_notes"
  "learning_ai_fastgap"
  "learning_ai_jarvis_jr"
  "learning_ai_flowmonk"
  "learning_ai_trails"
  "learning_ai_local_memory_gpt"
  "learning_ai_efforise"
)

if [ -n "$SINGLE_REPO" ]; then
  CONSUMERS=("$(basename "$SINGLE_REPO")")
  SIBLING_ROOT="$(cd "$(dirname "$SINGLE_REPO")" && pwd)"
fi

drift=0
synced=0
skipped=0

for repo in "${CONSUMERS[@]}"; do
  target_dir="$SIBLING_ROOT/$repo"
  target="$target_dir/scripts/docker-prep.sh"
  if [ ! -d "$target_dir" ]; then
    echo "  ⊘ skip $repo (not present at $target_dir)"
    skipped=$((skipped+1))
    continue
  fi
  if [ ! -f "$target" ]; then
    echo "  ⊘ skip $repo (no existing scripts/docker-prep.sh)"
    skipped=$((skipped+1))
    continue
  fi

  # Sync 3 files together: main script + 2 JS helpers
  HELPER_INJECT="$SCRIPT_DIR/_docker-prep-inject.js"
  HELPER_STRIP="$SCRIPT_DIR/_docker-prep-strip.js"
  T_HELPER_INJECT="$(dirname "$target")/_docker-prep-inject.js"
  T_HELPER_STRIP="$(dirname "$target")/_docker-prep-strip.js"

  in_sync=true
  cmp -s "$TEMPLATE" "$target" || in_sync=false
  cmp -s "$HELPER_INJECT" "$T_HELPER_INJECT" 2>/dev/null || in_sync=false
  cmp -s "$HELPER_STRIP" "$T_HELPER_STRIP" 2>/dev/null || in_sync=false

  if $in_sync; then
    echo "  ✓ $repo (in sync)"
    continue
  fi

  if $CHECK_ONLY; then
    echo "  ✗ $repo DRIFT"
    drift=$((drift+1))
  else
    mkdir -p "$(dirname "$target")"
    cp "$TEMPLATE" "$target"
    cp "$HELPER_INJECT" "$T_HELPER_INJECT"
    cp "$HELPER_STRIP" "$T_HELPER_STRIP"
    chmod +x "$target"
    echo "  ↺ $repo synced (script + 2 helpers)"
    synced=$((synced+1))
  fi
done

echo ""
if $CHECK_ONLY; then
  if [ $drift -gt 0 ]; then
    echo "❌ $drift repo(s) drifted from canonical template"
    exit 1
  fi
  echo "✅ All repos in sync with canonical docker-prep template"
else
  echo "✅ Synced: $synced, skipped: $skipped"
fi