# 🛡️ AntiScam AI Pro - Configuración Nginx
# Proxy reverso con SSL y optimizaciones

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    # Configuraciones básicas
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    
    # Logging
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    
    access_log /var/log/nginx/access.log main;
    
    # Optimizaciones de rendimiento
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 50M;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;
    
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=login:10m rate=5r/m;
    
    # 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 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'; connect-src 'self';" always;
    
    # Upstream para AntiScam AI
    upstream antiscam_backend {
        server antiscam-ai:7860 max_fails=3 fail_timeout=30s;
        keepalive 32;
    }
    
    # Redirección HTTP a HTTPS
    server {
        listen 80;
        server_name tu-dominio.com www.tu-dominio.com;
        
        # Certificados Let's Encrypt (ACME challenge)
        location /.well-known/acme-challenge/ {
            root /var/www/certbot;
        }
        
        # Redireccionar todo a HTTPS
        location / {
            return 301 https://$server_name$request_uri;
        }
    }
    
    # Servidor HTTPS principal
    server {
        listen 443 ssl http2;
        server_name tu-dominio.com www.tu-dominio.com;
        
        # Certificados SSL
        ssl_certificate /etc/nginx/ssl/cert.pem;
        ssl_certificate_key /etc/nginx/ssl/key.pem;
        
        # Configuración SSL moderna
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;
        
        # HSTS
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        
        # Archivos estáticos con caché
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            try_files $uri @backend;
        }
        
        # Rate limiting para rutas sensibles
        location ~ ^/(login|register|api) {
            limit_req zone=login burst=10 nodelay;
            proxy_pass http://antiscam_backend;
            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;
        }
        
        # WebSocket support para Gradio
        location /queue/join {
            proxy_pass http://antiscam_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;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_read_timeout 86400;
        }
        
        # Ruta principal de la aplicación
        location / {
            limit_req zone=api burst=20 nodelay;
            
            # Proxy headers
            proxy_pass http://antiscam_backend;
            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;
            
            # Buffering
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
            proxy_busy_buffers_size 8k;
        }
        
        # Ruta para webhooks de Stripe
        location /webhook/stripe {
            limit_req zone=api burst=5 nodelay;
            proxy_pass http://antiscam_backend/webhook/stripe;
            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;
        }
        
        # Página de mantenimiento
        location @maintenance {
            root /usr/share/nginx/html;
            try_files /maintenance.html =503;
        }
        
        # Error pages personalizadas
        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
    
    # Servidor de monitoreo (opcional)
    server {
        listen 8080;
        server_name localhost;
        
        # Status de Nginx
        location /nginx_status {
            stub_status on;
            access_log off;
            allow 127.0.0.1;
            allow 172.16.0.0/12;  # Docker networks
            deny all;
        }
        
        # Health check
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }
    }
}