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

# Build Linux distribution (self-contained venv + tarball)
# Usage: ./build-dist-linux.sh [VERSION]

# --- Version detection ---
VERSION="${1:-}"

if [ -z "$VERSION" ]; then
    VERSION=$(git describe --tags --exact-match 2>/dev/null || true)
fi

if [ -z "$VERSION" ]; then
    VERSION="${GITEA_REF_NAME:-${GITHUB_REF_NAME:-}}"
fi

if [ -z "$VERSION" ]; then
    VERSION=$(grep -oP '__version__\s*=\s*"\K[^"]+' \
      media_server/__init__.py 2>/dev/null || echo "0.0.0")
fi

VERSION_CLEAN="${VERSION#v}"
echo "Building Media Server v${VERSION_CLEAN} for Linux"

# --- Configuration ---
DIST_DIR="dist/media-server"
BUILD_OUTPUT="build/MediaServer-v${VERSION_CLEAN}-linux-x64"

rm -rf dist build
mkdir -p "${DIST_DIR}" build

# --- Verify frontend bundle ---
if [ ! -f "media_server/static/dist/app.bundle.js" ]; then
    echo "ERROR: Frontend bundle not found. Run 'npm ci && npm run build' first."
    exit 1
fi

# --- Create self-contained virtualenv ---
echo "Creating virtualenv..."
python3 -m venv "${DIST_DIR}/venv"
source "${DIST_DIR}/venv/bin/activate"
pip install --quiet --upgrade pip
pip install --quiet ".[visualizer]"

# Remove the installed package (app source is on PYTHONPATH via launcher)
rm -rf "${DIST_DIR}"/venv/lib/python*/site-packages/media_server*
rm -rf "${DIST_DIR}"/venv/lib/python*/site-packages/media_server*.dist-info

deactivate

# --- Copy application ---
echo "Copying application files..."
mkdir -p "${DIST_DIR}/app"
cp -r media_server "${DIST_DIR}/app/"

# Remove source JS (bundle is in dist/)
rm -rf "${DIST_DIR}/app/media_server/static/js"
# Remove source maps from release
rm -f "${DIST_DIR}/app/media_server/static/dist/"*.map

# Copy config example
cp config.example.yaml "${DIST_DIR}/"

# --- Write version ---
echo "$VERSION_CLEAN" > "${DIST_DIR}/VERSION"

# --- Create launcher ---
cat > "${DIST_DIR}/media-server.sh" << 'LAUNCHER'
#!/usr/bin/env bash
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
export PYTHONPATH="$SCRIPT_DIR/app"
source "$SCRIPT_DIR/venv/bin/activate"
exec python -m media_server.main "$@"
LAUNCHER
chmod +x "${DIST_DIR}/media-server.sh"

# --- Create systemd service installer ---
cat > "${DIST_DIR}/install-service.sh" << 'SERVICE'
#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SERVICE_NAME="media-server"
SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"

if [ "$EUID" -ne 0 ]; then
    echo "Please run with sudo: sudo ./install-service.sh"
    exit 1
fi

REAL_USER="${SUDO_USER:-$USER}"

cat > "$SERVICE_FILE" << EOF
[Unit]
Description=Media Server
After=network.target sound.target

[Service]
Type=simple
User=${REAL_USER}
WorkingDirectory=${SCRIPT_DIR}
ExecStart=${SCRIPT_DIR}/media-server.sh
Restart=on-failure
RestartSec=5
Environment=PYTHONUNBUFFERED=1

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable "${SERVICE_NAME}"
systemctl start "${SERVICE_NAME}"
echo "Service '${SERVICE_NAME}' installed and started."
echo "Check status: systemctl status ${SERVICE_NAME}"
SERVICE
chmod +x "${DIST_DIR}/install-service.sh"

# --- Package ---
echo "Creating archive..."
cp -r "${DIST_DIR}" "${BUILD_OUTPUT}"
tar -czf "${BUILD_OUTPUT}.tar.gz" -C build "MediaServer-v${VERSION_CLEAN}-linux-x64"

echo "Build complete: ${BUILD_OUTPUT}.tar.gz"