#!/usr/bin/env bash
set -euo pipefail

# Build a deploy package containing only code changes/new files
# from source compared to destination.
#
# Usage:
#   scripts/ops/netgescon-build-update-package.sh \
#     --src /home/michele/netgescon/netgescon-laravel \
#     --compare-dir /var/www/netgescon \
#     --out-dir /var/www/netgescon/storage/app/public/ops-packages

SRC_DIR="/home/michele/netgescon/netgescon-laravel"
COMPARE_DIR="/var/www/netgescon"
OUT_DIR="/var/www/netgescon/storage/app/public/ops-packages"

while [[ $# -gt 0 ]]; do
  case "$1" in
    --src)
      SRC_DIR="$2"
      shift 2
      ;;
    --compare-dir)
      COMPARE_DIR="$2"
      shift 2
      ;;
    --out-dir)
      OUT_DIR="$2"
      shift 2
      ;;
    *)
      echo "Unknown option: $1"
      echo "Usage: $0 [--src <dir>] [--compare-dir <dir>] [--out-dir <dir>]"
      exit 1
      ;;
  esac
done

if [[ ! -d "$SRC_DIR" || ! -f "$SRC_DIR/artisan" ]]; then
  echo "Error: invalid source app dir: $SRC_DIR"
  exit 1
fi

if [[ ! -d "$COMPARE_DIR" || ! -f "$COMPARE_DIR/artisan" ]]; then
  echo "Error: invalid compare app dir: $COMPARE_DIR"
  exit 1
fi

mkdir -p "$OUT_DIR"
STAMP="$(date +"%Y%m%d-%H%M%S")"
WORK_DIR="/tmp/netgescon-update-package-$STAMP"
mkdir -p "$WORK_DIR"

cleanup() {
  rm -rf "$WORK_DIR"
}
trap cleanup EXIT

RSYNC_ARGS=(
  -avh
  --checksum
  --update
  --compare-dest="$COMPARE_DIR"
  --exclude=.git/
  --exclude=.env
  --exclude=storage/
  --exclude=node_modules/
  --exclude=vendor/
)

# Copy only files that differ from compare destination.
rsync "${RSYNC_ARGS[@]}" "$SRC_DIR/" "$WORK_DIR/"

FILE_COUNT="$(find "$WORK_DIR" -type f | wc -l | tr -d ' ')"
if [[ "$FILE_COUNT" == "0" ]]; then
  echo "No code differences found between source and destination."
  exit 0
fi

PACKAGE_PATH="$OUT_DIR/netgescon-update-$STAMP.tar.gz"
tar -czf "$PACKAGE_PATH" -C "$WORK_DIR" .

# Keep a stable pointer to the latest package.
ln -sfn "$PACKAGE_PATH" "$OUT_DIR/latest-update.tar.gz"

echo "Update package created."
echo "FILES_INCLUDED=$FILE_COUNT"
echo "PACKAGE_PATH=$PACKAGE_PATH"