# ─── EnFlow Nginx Configuration ────────────────────────────────────────────

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

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    # Logging format
    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;

    # Performance
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    # 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;

    # Rate limiting zones
    limit_req_zone $binary_remote_addr zone=api:10m rate=30r/s;
    limit_req_zone $binary_remote_addr zone=general:10m rate=100r/s;

    # Upstream to Next.js app
    upstream cirux_app {
        server cirux-app:3000;
    }

    # ─── HTTP → HTTPS Redirect ───────────────────────────────────────────────
    server {
        listen 80;
        server_name _;

        # Certbot challenge
        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 _;

        # SSL certificates (mount via certbot volume)
        ssl_certificate /etc/letsencrypt/live/cirux.silvioalzate.shop/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/cirux.silvioalzate.shop/privkey.pem;

        # SSL settings
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 1d;

        # 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;

        # Proxy to Next.js
        location / {
            limit_req zone=general burst=50 nodelay;
            proxy_pass http://cirux_app;
            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_cache_bypass $http_upgrade;
            proxy_read_timeout 86400;
        }

        # API routes with stricter rate limiting
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://cirux_app;
            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;
        }

        # Static files caching
        location /_next/static/ {
            proxy_pass http://cirux_app;
            proxy_cache_valid 200 365d;
            add_header Cache-Control "public, immutable";
        }

        location /static/ {
            proxy_pass http://cirux_app;
            proxy_cache_valid 200 365d;
            add_header Cache-Control "public, immutable";
        }

        # WebSocket support for Supabase Realtime
        location /realtime/ {
            proxy_pass http://cirux_app;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_read_timeout 86400;
        }
    }
}