upstream frontend {
    server frontend:5173;
}

upstream backend {
    server backend:3000;
}

server {
    listen 80;
    server_name localhost;

    client_max_body_size 10M;

    # 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;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;

    # Content Security Policy (permissive for dev, tighten for production)
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' ws: wss:; media-src 'self' blob:; object-src 'none'; base-uri 'self'; form-action 'self';" always;

    # Block access to sensitive files and directories
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
        return 404;
    }

    location ~ \.(env|git|gitignore|dockerignore|htaccess|htpasswd)$ {
        deny all;
        access_log off;
        log_not_found off;
        return 404;
    }

    location ~ ^/(node_modules|\.git|\.vscode|\.idea|docker-compose|Dockerfile|package\.json|package-lock\.json|yarn\.lock|pnpm-lock\.yaml|\.npmrc|\.yarnrc|tsconfig\.json|\.eslintrc|\.prettierrc|prisma|\.env.*|\.db|\.sqlite|\.sql|backup|backups|dumps|logs)/? {
        deny all;
        access_log off;
        log_not_found off;
        return 404;
    }

    location ~ \.(bak|backup|swp|tmp|old|orig|save|~)$ {
        deny all;
        access_log off;
        log_not_found off;
        return 404;
    }

    # Frontend - Vite Dev Server
    location / {
        proxy_pass http://frontend;
        proxy_http_version 1.1;

        # WebSocket support (dla Vite HMR)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Standard proxy headers
        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;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Backend API
    location /api {
        proxy_pass http://backend;
        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;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # WebSocket for Socket.IO
    location /socket.io {
        proxy_pass http://backend;
        proxy_http_version 1.1;

        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;

        # Timeouts for WebSocket
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;
    }
}