#!/bin/sh
# build.sh — Assemble syno-balance SPK for Synology SRM (noarch)
# Output: syno-balance-0.1-0001.spk
# TEST BUILD — not for production.
#
# SPK structure (outer tar, UNCOMPRESSED):
#   INFO
#   PACKAGE_ICON.PNG         (64x64)
#   PACKAGE_ICON_256.PNG     (256x256)
#   scripts/
#     postinst
#     start-stop-status
#     preinst
#     preuninst
#     postuninst
#   conf/
#     privilege
#     resource
#   package.tgz              (gzipped inner tar of bin/ + etc/)
#   checksum                 (md5 of package.tgz)

set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "$SCRIPT_DIR"

PKG_NAME="syno-balance"
VERSION="0.1-0001"
OUTPUT="${PKG_NAME}-${VERSION}.spk"
BUILD_DIR="/tmp/syno-balance-build-$$"

echo "=== Building ${PKG_NAME}-${VERSION}.spk (TEST BUILD) ==="

# Clean and create build staging directory
rm -rf "$BUILD_DIR"
mkdir -p "$BUILD_DIR"

# ── 1. Create inner package.tgz (gzipped tar of bin/ + etc/) ──────────
echo "  → Creating package.tgz"
tar -czf "$BUILD_DIR/package.tgz" \
    --format=ustar \
    bin/ \
    etc/

# ── 2. Generate checksum ──────────────────────────────────────────────
echo "  → Computing checksum"
md5sum "$BUILD_DIR/package.tgz" | awk '{print $1}' > "$BUILD_DIR/checksum"

# ── 3. Assemble outer SPK (UNCOMPRESSED tar) ──────────────────────────
echo "  → Assembling SPK"
tar -cf "${OUTPUT}" \
    --format=ustar \
    -C "$SCRIPT_DIR" \
    INFO \
    PACKAGE_ICON.PNG \
    PACKAGE_ICON_256.PNG \
    scripts/ \
    -C "$BUILD_DIR" \
    package.tgz \
    checksum

# SPK conf/ goes in the outer tar too
tar -rf "${OUTPUT}" \
    --format=ustar \
    -C "$SCRIPT_DIR" \
    conf/privilege \
    conf/resource

# ── 4. Verify ─────────────────────────────────────────────────────────
echo "  → Verifying SPK contents"
tar -tf "${OUTPUT}" | sort

SIZE=$(stat -f%z "${OUTPUT}" 2>/dev/null || stat -c%s "${OUTPUT}" 2>/dev/null)
echo ""
echo "=== Build complete: ${OUTPUT} ==="
echo "    Size: ${SIZE} bytes"
echo "    MD5:  $(md5sum "${OUTPUT}" | awk '{print $1}')"

# Cleanup
rm -rf "$BUILD_DIR"
