#!/bin/bash

# Data Visualization Display Wall - Systemd Installer
# Requirements: Node.js, NPM, Systemd (Linux)

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

echo -e "${BLUE}=== Data Visualization Display Wall Installer ===${NC}"

# 1. Check permissions
if [ "$EUID" -ne 0 ]; then
  echo -e "${RED}Please run as root (sudo ./Install.sh)${NC}"
  exit 1
fi

# 2. Get current directory and user
PROJECT_DIR=$(pwd)
REAL_USER=${SUDO_USER:-$USER}
USER_HOME=$(getent passwd "$REAL_USER" | cut -d: -f6)

echo -e "Project Directory: ${GREEN}$PROJECT_DIR${NC}"
echo -e "Running User: ${GREEN}$REAL_USER${NC}"

# 3. Check for dependencies
if ! command -v node &> /dev/null; then
    echo -e "${RED}Node.js is not installed. Please install Node.js first.${NC}"
    exit 1
fi

if ! command -v npm &> /dev/null; then
    echo -e "${RED}NPM is not installed. Please install NPM first.${NC}"
    exit 1
fi

# 4. Install NPM dependencies
echo -e "${BLUE}Installing dependencies...${NC}"
# Run npm install as the real user to avoid permission issues in node_modules
sudo -u "$REAL_USER" npm install

if [ $? -ne 0 ]; then
    echo -e "${RED}NPM install failed.${NC}"
    exit 1
fi

# 5. Create Systemd Service File
SERVICE_FILE="/etc/systemd/system/data-wall.service"
NODE_PATH=$(command -v node)

echo -e "${BLUE}Creating systemd service at $SERVICE_FILE...${NC}"

cat <<EOF > "$SERVICE_FILE"
[Unit]
Description=Data Visualization Display Wall
After=network.target mysql.service

[Service]
Type=simple
User=$REAL_USER
WorkingDirectory=$PROJECT_DIR
ExecStart=$NODE_PATH server/index.js
Restart=always
RestartSec=10
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=data-wall
Environment=NODE_ENV=production
Environment=PORT=3000
# If you have specific env vars in .env, they will be loaded by the app's dotenv.config()

[Install]
WantedBy=multi-user.target
EOF

# 6. Reload Systemd and Start
echo -e "${BLUE}Reloading systemd and starting service...${NC}"
systemctl daemon-reload
systemctl enable data-wall
systemctl stop data-wall # Stop if already running
systemctl start data-wall

# 7. Check Status
if systemctl is-active --quiet data-wall; then
    echo -e "${GREEN}SUCCESS: Service is now running.${NC}"
    echo -e "You can access the dashboard at http://localhost:3000"
    echo -e "View logs with: ${BLUE}journalctl -u data-wall -f${NC}"
else
    echo -e "${RED}FAILED: Service failed to start. Check logs with 'journalctl -u data-wall -xe'${NC}"
fi

echo -e "${BLUE}================================================${NC}"