upstream frontend {
    server frontend:5173;
}

# ── HTTP: ACME challenge + redirect to HTTPS ──
server {
    listen 80;
    server_name dociva.io www.dociva.io;

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

# ── HTTPS ──
server {
    listen 443 ssl;
    server_name dociva.io www.dociva.io;
    client_max_body_size 100M;
    resolver 127.0.0.11 valid=30s ipv6=off;
    set $backend_upstream backend:5000;

    # SSL certificates (Let's Encrypt)
    ssl_certificate /etc/letsencrypt/live/dociva.io/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/dociva.io/privkey.pem;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;

    # 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 "camera=(), microphone=(), geolocation=()" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' https://pagead2.googlesyndication.com https://www.googletagmanager.com https://www.google-analytics.com https://plausible.io; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: blob: https://pagead2.googlesyndication.com https://www.google-analytics.com; connect-src 'self' https://www.google-analytics.com https://pagead2.googlesyndication.com https://plausible.io; frame-src https://googleads.g.doubleclick.net https://tpc.googlesyndication.com; frame-ancestors 'self'" always;

    # API requests → Flask backend
    location /api/ {
        proxy_pass http://$backend_upstream;
        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;

        # Timeout for large file uploads
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        proxy_connect_timeout 60s;
    }

    # Frontend (Vite dev server)
    location / {
        proxy_pass http://frontend;
        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 Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # Health check
    location /health {
        proxy_pass http://$backend_upstream/api/health;
    }
}