# Smartbotic Nginx Configuration
# This file is managed by Smartbotic installer
# Domain: {{DOMAIN}}

# Rate limiting
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=100r/s;
limit_conn_zone $binary_remote_addr zone=conn_limit:10m;

# Upstream definition
upstream smartbotic_http {
    server 127.0.0.1:8090;
    keepalive 32;
}

# HTTP -> HTTPS redirect
server {
    listen 80;
    listen [::]:80;
    server_name {{SERVER_NAMES}};

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

    # Redirect all other traffic to HTTPS
    location / {
        return 301 https://$host$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl;
    listen [::]:443 ssl;
    http2 on;
    server_name {{SERVER_NAMES}};

    # SSL certificates (managed by certbot)
    ssl_certificate /etc/letsencrypt/live/{{DOMAIN}}/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/{{DOMAIN}}/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/{{DOMAIN}}/chain.pem;

    # Modern SSL 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:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # OCSP stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    resolver 1.1.1.1 8.8.8.8 valid=300s;
    resolver_timeout 5s;

    # Security headers
    add_header Strict-Transport-Security "max-age=63072000" 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;

    # Logging
    access_log /var/log/nginx/smartbotic_access.log;
    error_log /var/log/nginx/smartbotic_error.log;

    # Client settings
    client_max_body_size 50M;
    client_body_timeout 60s;
    client_header_timeout 60s;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

    # API endpoints
    location /api/ {
        limit_req zone=api_limit burst=50 nodelay;
        limit_conn conn_limit 100;

        proxy_pass http://smartbotic_http;
        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 Connection "";
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        proxy_connect_timeout 60s;
        proxy_buffering off;
    }

    # WebUI static files and SPA fallback
    location / {
        proxy_pass http://smartbotic_http;
        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 Connection "";

        # Cache static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            proxy_pass http://smartbotic_http;
            proxy_cache_valid 200 1d;
            add_header Cache-Control "public, max-age=86400";
        }
    }

    # Health check endpoint (no rate limit)
    location /health {
        proxy_pass http://smartbotic_http/api/v1/health;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header Connection "";
    }
}