#!/bin/bash
# ZMB Webui Frontend Static Export Deployment
# Für RAM-optimierte Lösung: next build → out/ → nginx serve (kein Node.js Runtime)

set -e

echo "=== ZMB Webui Frontend Static Export Build ==="

# Configuration
FRONTEND_DIR="/opt/zmb-webui/frontend"
FRONTEND_TEMP="/tmp/frontend"

# Colors
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m'

# Check frontend directory exists
echo -e "${YELLOW}1. Checking frontend source...${NC}"
if [ ! -d "$FRONTEND_TEMP" ]; then
    echo -e "${RED}✗ Frontend source not found: $FRONTEND_TEMP${NC}"
    echo -e "${RED}   Make sure frontend was copied to container first${NC}"
    exit 1
fi
echo -e "${GREEN}✓ Frontend source found${NC}"

# Create/prepare frontend directory
echo -e "${YELLOW}2. Preparing frontend directory...${NC}"
mkdir -p "$FRONTEND_DIR"
rm -rf "$FRONTEND_DIR"/*
cp -r "$FRONTEND_TEMP"/* "$FRONTEND_DIR/"
cd "$FRONTEND_DIR"
echo -e "${GREEN}✓ Frontend prepared${NC}"

# Install dependencies with memory optimization
echo -e "${YELLOW}4. Installing dependencies (memory-optimized)...${NC}"
npm install --prefer-offline --no-audit --production=false 2>&1 | grep -E "added|up to date|npm WARN" || true
echo -e "${GREEN}✓ Dependencies installed${NC}"

# Build static export
echo -e "${YELLOW}5. Building static export...${NC}"
npm run build 2>&1 | tail -20
echo -e "${GREEN}✓ Build complete${NC}"

# Verify out/ directory
echo -e "${YELLOW}6. Verifying export directory...${NC}"
if [ ! -d "$FRONTEND_DIR/out" ]; then
    echo -e "${RED}✗ Export directory 'out' not found${NC}"
    exit 1
fi
PAGES_COUNT=$(find out -name "*.html" | wc -l)
echo -e "${GREEN}✓ Export successful ($PAGES_COUNT pages)${NC}"

# Configure nginx
echo -e "${YELLOW}7. Configuring nginx...${NC}"
sudo tee /etc/nginx/sites-available/zmb-webui > /dev/null <<'NGINX_CONF'
server {
    listen 9090;
    server_name _;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;

    # Compression
    gzip on;
    gzip_min_length 1000;
    gzip_types text/plain text/css application/json application/javascript;
    gzip_comp_level 5;

    # Static assets cache (7 days)
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        root /opt/zmb-webui/frontend/out;
        expires 7d;
        add_header Cache-Control "public, max-age=604800, immutable";
        access_log off;
    }

    # Frontend static pages
    location / {
        root /opt/zmb-webui/frontend/out;
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "public, max-age=3600";
    }

    # API routes → Backend
    location /api/ {
        proxy_pass http://localhost:8000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_connect_timeout 10s;
        proxy_read_timeout 30s;
    }

    # Health check
    location /health {
        proxy_pass http://localhost:8000;
        access_log off;
    }

    # Logging
    access_log /var/log/nginx/zmb-webui-access.log combined;
    error_log /var/log/nginx/zmb-webui-error.log warn;
}
NGINX_CONF
echo -e "${GREEN}✓ Nginx configured${NC}"

# Enable nginx site
echo -e "${YELLOW}8. Enabling nginx site...${NC}"
sudo rm -f /etc/nginx/sites-enabled/default
sudo ln -sf /etc/nginx/sites-available/zmb-webui /etc/nginx/sites-enabled/zmb-webui
echo -e "${GREEN}✓ Nginx site enabled${NC}"

# Test and reload nginx
echo -e "${YELLOW}9. Testing and reloading nginx...${NC}"
sudo nginx -t
sudo systemctl reload nginx
echo -e "${GREEN}✓ Nginx reloaded${NC}"

# Clean up systemd service (no longer needed for Node.js)
echo -e "${YELLOW}10. Cleaning up systemd services...${NC}"
if [ -f /etc/systemd/system/zmb-webui-frontend.service ]; then
    sudo systemctl disable zmb-webui-frontend 2>/dev/null || true
    sudo systemctl stop zmb-webui-frontend 2>/dev/null || true
    sudo rm -f /etc/systemd/system/zmb-webui-frontend.service
    sudo systemctl daemon-reload
    echo -e "${GREEN}✓ Frontend Node.js service removed${NC}"
fi

# Verify connectivity
echo -e "${YELLOW}11. Testing connectivity...${NC}"
sleep 1
if curl -s http://localhost:9090 > /dev/null 2>&1; then
    echo -e "${GREEN}✓ Frontend accessible at http://localhost:9090${NC}"
else
    echo -e "${YELLOW}⚠ Frontend not yet responding (nginx warming up)${NC}"
fi

# Summary
echo ""
echo -e "${GREEN}=== Deployment Complete ===${NC}"
echo ""
echo "Frontend (Static):"
echo "  URL: http://$(hostname -I | awk '{print $1}'):9090"
echo ""
echo "Backend API:"
echo "  URL: http://localhost:8000"
echo "  Health: curl http://localhost:8000/health"
echo ""
echo "Service Management:"
echo "  systemctl status nginx"
echo "  systemctl restart nginx"
echo ""
echo "Logs:"
echo "  tail -f /var/log/nginx/zmb-webui-access.log"
echo "  tail -f /var/log/nginx/zmb-webui-error.log"
echo ""