#!/bin/bash

# Exit on error
set -e

# Get the actual user who invoked sudo
if [ -n "$SUDO_USER" ]; then
    ACTUAL_USER="$SUDO_USER"
else
    ACTUAL_USER=$(whoami)
fi

# Get the home directory of the actual user
USER_HOME=$(eval echo ~$ACTUAL_USER)

# Determine the Project Root Directory (parent of scripts/install/)
PROJECT_ROOT_DIR=$(cd "$(dirname "$0")/../.." && pwd)

echo "Installing LED Matrix Display Service for user: $ACTUAL_USER"
echo "Using home directory: $USER_HOME"
echo "Project root directory: $PROJECT_ROOT_DIR"

# Create a temporary service file for the main display with the correct paths
# Assuming ledmatrix.service template exists and uses /home/ledpi as a placeholder for user home
if [ -f "$PROJECT_ROOT_DIR/systemd/ledmatrix.service" ]; then
    sed "s|/home/ledpi|$USER_HOME|g; s|__PROJECT_ROOT_DIR__|$PROJECT_ROOT_DIR|g; s|__USER__|root|g" "$PROJECT_ROOT_DIR/systemd/ledmatrix.service" > /tmp/ledmatrix.service.tmp
    # Copy the service file to the systemd directory
    sudo cp /tmp/ledmatrix.service.tmp /etc/systemd/system/ledmatrix.service
    # Clean up
    rm /tmp/ledmatrix.service.tmp
else
    echo "WARNING: ledmatrix.service template not found at $PROJECT_ROOT_DIR/systemd/ledmatrix.service. Main display service not configured."
fi


# Reload systemd to recognize the new service (or modified service)
sudo systemctl daemon-reload

if [ -f "/etc/systemd/system/ledmatrix.service" ]; then
    echo "Enabling ledmatrix.service (main display) to start on boot..."
    sudo systemctl enable ledmatrix.service
    echo "Starting ledmatrix.service (main display)..."
    sudo systemctl start ledmatrix.service
else
    echo "Skipping enable/start for ledmatrix.service as it was not configured."
fi

# === LEDMatrix Web Interface service (ledmatrix-web.service) ===
echo "Installing LEDMatrix Web Interface service (ledmatrix-web.service)..."

WEB_SERVICE_FILE_CONTENT=$(cat <<EOF
[Unit]
Description=LED Matrix Web Interface (Conditional Start)
After=network.target
# Wants=ledmatrix.service
# After=network.target ledmatrix.service

[Service]
Type=simple
ExecStart=/usr/bin/python3 ${PROJECT_ROOT_DIR}/scripts/utils/start_web_conditionally.py
WorkingDirectory=${PROJECT_ROOT_DIR}
StandardOutput=journal
StandardError=journal
User=${ACTUAL_USER}
Restart=on-failure
# Environment="PYTHONUNBUFFERED=1"

[Install]
WantedBy=multi-user.target
EOF
)

# Write the new service file
echo "$WEB_SERVICE_FILE_CONTENT" | sudo tee /etc/systemd/system/ledmatrix-web.service > /dev/null

echo "Reloading systemd daemon for web service..."
sudo systemctl daemon-reload

echo "Enabling ledmatrix-web.service to start on boot..."
sudo systemctl enable ledmatrix-web.service

echo "Starting ledmatrix-web.service..."
sudo systemctl start ledmatrix-web.service

echo "LEDMatrix Web Interface service (ledmatrix-web.service) installation complete."
echo "It will start based on the 'web_display_autostart' setting in config/config.json."
# === End of LEDMatrix Web Interface service ===


# Check the status
echo "Service status for main display (ledmatrix.service):"
sudo systemctl status ledmatrix.service || echo "ledmatrix.service not found or failed to get status."
echo "Service status for web interface (ledmatrix-web.service):"
sudo systemctl status ledmatrix-web.service || echo "ledmatrix-web.service not found or failed to get status."

echo ""
echo "LED Matrix Services have been processed."
echo ""
echo "To stop the main display when you SSH in:"
echo "  sudo systemctl stop ledmatrix.service"
echo "To stop the web interface:"
echo "  sudo systemctl stop ledmatrix-web.service"

echo ""
echo "To check if the main display service is running:"
echo "  sudo systemctl status ledmatrix.service"
echo "To check if the web interface service is running:"
echo "  sudo systemctl status ledmatrix-web.service"

echo ""
echo "To restart the main display service:"
echo "  sudo systemctl restart ledmatrix.service"
echo "To restart the web interface service:"
echo "  sudo systemctl restart ledmatrix-web.service"

echo ""
echo "To view logs for the main display:"
echo "  journalctl -u ledmatrix.service"
echo "To view logs for the web interface:"
echo "  journalctl -u ledmatrix-web.service"

echo ""
echo "To disable autostart for the main display:"
echo "  sudo systemctl disable ledmatrix.service"
echo "To disable autostart for the web interface:"
echo "  sudo systemctl disable ledmatrix-web.service"