#!/bin/bash

# Server Update Script for Ice Watch Application
# This script handles updating the production server with proper user permissions

set -e

# Configuration
APP_DIR="/opt/icewatch"
APP_USER="icewatch"
SERVICE_NAME="icewatch"

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

# Functions
log() {
    echo -e "${GREEN}[$(date +'%Y-%m-%d %H:%M:%S')] $1${NC}"
}

warn() {
    echo -e "${YELLOW}[$(date +'%Y-%m-%d %H:%M:%S')] WARNING: $1${NC}"
}

error() {
    echo -e "${RED}[$(date +'%Y-%m-%d %H:%M:%S')] ERROR: $1${NC}"
    exit 1
}

# Check if running as root
if [[ $EUID -ne 0 ]]; then
    error "This script must be run as root (use sudo)"
fi

# Check if app directory exists
if [[ ! -d "$APP_DIR" ]]; then
    error "Application directory $APP_DIR does not exist"
fi

# Check if service exists
if ! systemctl list-unit-files | grep -q "$SERVICE_NAME.service"; then
    error "Service $SERVICE_NAME does not exist"
fi

log "Starting server update process..."

# Stop the service
log "Stopping $SERVICE_NAME service..."
systemctl stop "$SERVICE_NAME"

# Navigate to app directory as app user and update
log "Updating application code..."
sudo -u "$APP_USER" bash -c "
    cd '$APP_DIR' && \
    git fetch origin && \
    git reset --hard origin/main && \
    npm install --production && \
    npm run build
"

# Check if build was successful
if [[ $? -ne 0 ]]; then
    error "Build failed! Check the logs above."
fi

# Start the service
log "Starting $SERVICE_NAME service..."
systemctl start "$SERVICE_NAME"

# Check service status
sleep 2
if systemctl is-active --quiet "$SERVICE_NAME"; then
    log "✅ Service $SERVICE_NAME is running successfully"
else
    error "❌ Service $SERVICE_NAME failed to start"
fi

# Show recent logs
log "Recent service logs:"
journalctl -u "$SERVICE_NAME" -n 10 --no-pager

log "🎉 Server update completed successfully!"
log "Application is now running the latest version from main branch"