# Rate limiting zones
limit_req_zone $binary_remote_addr zone=api:10m rate=30r/s;
limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/s;
limit_req_zone $binary_remote_addr zone=webhook:10m rate=10r/s;

upstream horux_api {
    server 127.0.0.1:4000;
}

upstream horux_web {
    server 127.0.0.1:3000;
}

# Redirect HTTP to HTTPS
server {
    listen 80;
    server_name horuxfin.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name horuxfin.com;

    # SSL (managed by Certbot)
    ssl_certificate /etc/letsencrypt/live/horuxfin.com-0001/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/horuxfin.com-0001/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 X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" 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: blob:; font-src 'self' data:; connect-src 'self' https://horuxfin.com; frame-ancestors 'self';" always;

    # Max body size (50MB for bulk CFDI uploads)
    client_max_body_size 50M;

    # Auth endpoints (stricter rate limiting)
    location /api/auth/ {
        limit_req zone=auth burst=10 nodelay;
        proxy_pass http://horux_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;
    }

    # Webhook endpoints (no auth, moderate rate limiting)
    location /api/webhooks/ {
        limit_req zone=webhook burst=20 nodelay;
        proxy_pass http://horux_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;
    }

    # API routes
    location /api/ {
        limit_req zone=api burst=50 nodelay;
        proxy_pass http://horux_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;
        proxy_read_timeout 300s;
    }

    # Health check (no rate limit)
    location /health {
        proxy_pass http://horux_api;
    }

    # Next.js frontend
    location / {
        proxy_pass http://horux_web;
        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_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}
