# Upstream servers
upstream odoo_backend {
    server odoo:8069;
}

upstream odoo_chat {
    server odoo:8072;
}

# Redirect all HTTP traffic to HTTPS
server {
    listen 80;
    server_name erp.yourdomain.edu;

    # ACME-challenge for Let's Encrypt certificates
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl http2;
    server_name erp.yourdomain.edu;

    # SSL certificate paths
    ssl_certificate /etc/nginx/certs/fullchain.pem;
    ssl_certificate_key /etc/nginx/certs/privkey.pem;

    # Modern TLS configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_prefer_server_ciphers on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets off;

    # Security Headers
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Request body limits for mobile document and certificate uploads
    client_max_body_size 25M;

    # Buffer sizes
    proxy_read_timeout 720s;
    proxy_connect_timeout 720s;
    proxy_send_timeout 720s;

    # Log format
    access_log /var/log/nginx/odoo.access.log;
    error_log /var/log/nginx/odoo.error.log;

    # Longpolling / WebSocket requests
    location /websocket {
        proxy_pass http://odoo_chat;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        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;
    }

    # Main Odoo application and Mobile API endpoints
    location / {
        proxy_pass http://odoo_backend;
        proxy_redirect off;
        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;

        # Gzip compression for API payloads and static files
        gzip on;
        gzip_types text/css text/less text/plain text/xml application/xml application/json application/javascript;
    }

    # Cache static files
    location ~* /web/static/ {
        proxy_cache_valid 200 60m;
        proxy_buffering on;
        expires 864000;
        proxy_pass http://odoo_backend;
    }
}