# ============================================
# Configuración Nginx para App Canchas de Pádel
# ============================================
# Ubicación: /etc/nginx/sites-available/app-padel
# Activar con: ln -s /etc/nginx/sites-available/app-padel /etc/nginx/sites-enabled/
# ============================================

# Upstream para la API - Balanceo de carga
upstream app_padel_api {
    least_conn;
    server 127.0.0.1:3000 max_fails=3 fail_timeout=30s;
    # Añadir más servidores para escalar horizontalmente:
    # server 127.0.0.1:3001 max_fails=3 fail_timeout=30s;
    # server 127.0.0.1:3002 max_fails=3 fail_timeout=30s;
    keepalive 32;
}

# Rate limiting zones
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=auth_limit:10m rate=5r/m;
limit_conn_zone $binary_remote_addr zone=conn_limit:10m;

# Map para determinar si es un webhook
map $uri $is_webhook {
    ~^/api/v1/(payments|subscriptions)/webhook 0;
    default 1;
}

# Servidor HTTP - Redirección a HTTPS
server {
    listen 80;
    server_name api.tudominio.com;
    
    # Redirigir todo a HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
    
    # Certbot challenge (para renovación SSL)
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }
}

# Servidor HTTPS
server {
    listen 443 ssl http2;
    server_name api.tudominio.com;
    
    # ============================================
    # SSL Configuration (Let's Encrypt)
    # ============================================
    ssl_certificate /etc/letsencrypt/live/api.tudominio.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.tudominio.com/privkey.pem;
    
    # SSL Security
    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;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    
    # OCSP Stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /etc/letsencrypt/live/api.tudominio.com/chain.pem;
    resolver 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;
    
    # Security headers
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    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;
    
    # ============================================
    # Logging
    # ============================================
    access_log /var/log/nginx/app-padel-access.log;
    error_log /var/log/nginx/app-padel-error.log warn;
    
    # ============================================
    # General Configuration
    # ============================================
    
    # Client body size
    client_max_body_size 10M;
    client_body_buffer_size 128k;
    
    # Timeouts
    client_header_timeout 30s;
    client_body_timeout 30s;
    send_timeout 30s;
    keepalive_timeout 65s;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 1024;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/rss+xml
        font/truetype
        font/opentype
        application/vnd.ms-fontobject
        image/svg+xml;
    
    # ============================================
    # Routes Configuration
    # ============================================
    
    # Root - API Info
    location / {
        return 200 '{"status":"API App Canchas de Pádel","version":"1.0.0","docs":"/api/v1/health"}';
        add_header Content-Type application/json;
        access_log off;
    }
    
    # Health check (lightweight, no rate limit)
    location /api/v1/health {
        proxy_pass http://app_padel_api;
        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;
        access_log off;
        
        # Fast response for health checks
        proxy_connect_timeout 5s;
        proxy_send_timeout 5s;
        proxy_read_timeout 5s;
    }
    
    # Webhooks de MercadoPago (sin rate limit, timeout extendido)
    location ~ ^/api/v1/(payments|subscriptions)/webhook {
        proxy_pass http://app_padel_api;
        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;
        
        # Webhooks necesitan tiempo para procesar
        proxy_read_timeout 60s;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        
        # Buffering desactivado para webhooks
        proxy_buffering off;
        proxy_request_buffering off;
        
        # Sin rate limiting para webhooks
        limit_req off;
        limit_conn off;
    }
    
    # Auth endpoints (rate limit más estricto)
    location ~ ^/api/v1/auth/(login|register|refresh)$ {
        limit_req zone=auth_limit burst=10 nodelay;
        limit_conn conn_limit 10;
        
        proxy_pass http://app_padel_api;
        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_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;
        
        proxy_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
    }
    
    # API endpoints (rate limit estándar)
    location /api/ {
        limit_req zone=api_limit burst=20 nodelay;
        limit_conn conn_limit 50;
        
        proxy_pass http://app_padel_api;
        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_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;
        proxy_set_header Connection "";
        
        # Timeouts
        proxy_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 300s;
        
        # Buffer settings
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
        proxy_busy_buffers_size 8k;
        
        # Cache control for API responses
        proxy_hide_header X-Powered-By;
        proxy_hide_header Server;
    }
    
    # Denegar acceso a archivos sensibles
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~* \.(env|env\.local|env\.production|env\.development)$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~* \.(git|gitignore|gitattributes)$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    # Favicon y robots.txt
    location = /favicon.ico {
        access_log off;
        log_not_found off;
    }
    
    location = /robots.txt {
        access_log off;
        log_not_found off;
        return 200 "User-agent: *\nDisallow: /api/\n";
    }
}

# ============================================
# Configuración para múltiples dominios (opcional)
# ============================================
# Si necesitas servir el frontend desde el mismo servidor:

# server {
#     listen 443 ssl http2;
#     server_name tudominio.com www.tudominio.com;
#     
#     ssl_certificate /etc/letsencrypt/live/tudominio.com/fullchain.pem;
#     ssl_certificate_key /etc/letsencrypt/live/tudominio.com/privkey.pem;
#     
#     # Frontend static files
#     root /var/www/frontend/dist;
#     index index.html;
#     
#     location / {
#         try_files $uri $uri/ /index.html;
#     }
#     
#     # API proxy
#     location /api/ {
#         proxy_pass http://app_padel_api;
#         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;
#     }
# }