#!/usr/bin/env bash
#
# Build a portable Linux distribution of LedGrab.
# Produces a self-contained tarball with virtualenv and launcher script.
#
# Usage:
#   ./build-dist.sh [VERSION]
#   ./build-dist.sh v0.1.0-alpha.1

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
BUILD_DIR="$SCRIPT_DIR/build"
DIST_NAME="LedGrab"
DIST_DIR="$BUILD_DIR/$DIST_NAME"
SERVER_DIR="$SCRIPT_DIR/server"
VENV_DIR="$DIST_DIR/venv"
APP_DIR="$DIST_DIR/app"

source "$SCRIPT_DIR/build-common.sh"

# ── Version detection ────────────────────────────────────────

detect_version "${1:-}"
TAR_NAME="LedGrab-v${VERSION_CLEAN}-linux-x64.tar.gz"

echo "=== Building LedGrab v${VERSION_CLEAN} (Linux) ==="
echo "  Output: build/$TAR_NAME"
echo ""

# ── Clean ────────────────────────────────────────────────────

echo "[1/7] Cleaning..."
clean_dist

# ── Create virtualenv ────────────────────────────────────────

echo "[2/7] Creating virtualenv..."
python3 -m venv "$VENV_DIR"
source "$VENV_DIR/bin/activate"
pip install --upgrade pip --quiet

# ── Install dependencies ─────────────────────────────────────

echo "[3/7] Installing dependencies..."
pip install --quiet "${SERVER_DIR}[notifications]" 2>&1 | {
    grep -i 'error\|failed' || true
}

# Resolve site-packages path (glob expand)
SITE_PACKAGES=$(echo "$VENV_DIR"/lib/python*/site-packages)

# Clean up with shared function
cleanup_site_packages "$SITE_PACKAGES" "so" "so"

# ── Build frontend ───────────────────────────────────────────

echo "[4/7] Building frontend..."
build_frontend

# ── Copy application files ───────────────────────────────────

echo "[5/7] Copying application files..."
copy_app_files

# ── Create launcher ──────────────────────────────────────────

echo "[6/7] Creating launcher..."
cat > "$DIST_DIR/run.sh" << 'LAUNCHER'
#!/usr/bin/env bash
set -euo pipefail

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

export PYTHONPATH="$SCRIPT_DIR/app/src"
export WLED_CONFIG_PATH="$SCRIPT_DIR/app/config/default_config.yaml"

mkdir -p "$SCRIPT_DIR/data" "$SCRIPT_DIR/logs"

source "$SCRIPT_DIR/venv/bin/activate"
exec python -m wled_controller.main
LAUNCHER

sed -i "s/VERSION_PLACEHOLDER/${VERSION_CLEAN}/" "$DIST_DIR/run.sh"
chmod +x "$DIST_DIR/run.sh"

# ── Create autostart scripts ─────────────────────────────────

cat > "$DIST_DIR/install-service.sh" << 'SERVICE_INSTALL'
#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SERVICE_NAME="ledgrab"
SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"
RUN_SCRIPT="$SCRIPT_DIR/run.sh"
CURRENT_USER="$(whoami)"

if [ "$EUID" -ne 0 ] && [ "$CURRENT_USER" != "root" ]; then
    echo "This script requires root privileges. Re-running with sudo..."
    exec sudo "$0" "$@"
fi

# Resolve the actual user (not root) when run via sudo
ACTUAL_USER="${SUDO_USER:-$CURRENT_USER}"
ACTUAL_HOME=$(eval echo "~$ACTUAL_USER")

echo "Installing LedGrab systemd service..."

cat > "$SERVICE_FILE" << EOF
[Unit]
Description=LedGrab ambient lighting server
After=network.target

[Service]
Type=simple
User=$ACTUAL_USER
WorkingDirectory=$SCRIPT_DIR
ExecStart=$RUN_SCRIPT
Restart=on-failure
RestartSec=5
Environment=HOME=$ACTUAL_HOME

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable "$SERVICE_NAME"
systemctl start "$SERVICE_NAME"

echo ""
echo "  [OK] LedGrab service installed and started."
echo ""
echo "  Commands:"
echo "    sudo systemctl status $SERVICE_NAME    # Check status"
echo "    sudo systemctl stop $SERVICE_NAME      # Stop"
echo "    sudo systemctl restart $SERVICE_NAME   # Restart"
echo "    sudo journalctl -u $SERVICE_NAME -f    # View logs"
echo ""
echo "  To remove: run ./uninstall-service.sh"
SERVICE_INSTALL
chmod +x "$DIST_DIR/install-service.sh"

cat > "$DIST_DIR/uninstall-service.sh" << 'SERVICE_UNINSTALL'
#!/usr/bin/env bash
set -euo pipefail

SERVICE_NAME="ledgrab"
SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"

if [ "$EUID" -ne 0 ] && [ "$(whoami)" != "root" ]; then
    echo "This script requires root privileges. Re-running with sudo..."
    exec sudo "$0" "$@"
fi

if [ ! -f "$SERVICE_FILE" ]; then
    echo "LedGrab service is not installed."
    exit 0
fi

echo "Removing LedGrab systemd service..."

systemctl stop "$SERVICE_NAME" 2>/dev/null || true
systemctl disable "$SERVICE_NAME" 2>/dev/null || true
rm -f "$SERVICE_FILE"
systemctl daemon-reload

echo ""
echo "  [OK] LedGrab service removed."
SERVICE_UNINSTALL
chmod +x "$DIST_DIR/uninstall-service.sh"

# ── Create tarball ───────────────────────────────────────────

echo "[7/7] Creating $TAR_NAME..."
deactivate 2>/dev/null || true

TAR_PATH="$BUILD_DIR/$TAR_NAME"
(cd "$BUILD_DIR" && tar -czf "$TAR_NAME" "$DIST_NAME")

TAR_SIZE=$(du -h "$TAR_PATH" | cut -f1)
echo ""
echo "=== Build complete ==="
echo "  Archive: $TAR_PATH"
echo "  Size: $TAR_SIZE"
echo ""