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

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

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

    # Logging
    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;
    server_tokens off;

    # Gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=global:10m rate=10r/s;

    # SSL configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Upstream servers (using external container names)
    upstream cmc_staging {
        server cmc-nginx-staging:80;
        keepalive 32;
    }

    upstream cmc_production {
        server cmc-nginx-production:80;
        keepalive 32;
    }

    # Redirect HTTP to HTTPS
    server {
        listen 80;
        server_name cmc.springupsoftware.com staging.cmc.springupsoftware.com;
        
        # ACME challenge for Lego
        location /.well-known/acme-challenge/ {
            root /var/www/acme-challenge;
            try_files $uri =404;
        }
        
        # Redirect all other traffic to HTTPS
        location / {
            return 301 https://$server_name$request_uri;
        }
    }

    # Production HTTPS
    server {
        listen 443 ssl http2;
        server_name cmc.springupsoftware.com;

        ssl_certificate /etc/ssl/certs/cmc.springupsoftware.com.crt;
        ssl_certificate_key /etc/ssl/certs/cmc.springupsoftware.com.key;

        # Security headers
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";

        # Rate limiting
        limit_req zone=global burst=20 nodelay;

        location / {
            proxy_pass http://cmc_production;
            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;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 128k;
            proxy_buffers 4 256k;
            proxy_busy_buffers_size 256k;
        }
    }

    # Staging HTTPS
    server {
        listen 443 ssl http2;
        server_name staging.cmc.springupsoftware.com;

        ssl_certificate /etc/ssl/certs/staging.cmc.springupsoftware.com.crt;
        ssl_certificate_key /etc/ssl/certs/staging.cmc.springupsoftware.com.key;

        # Security headers (less strict for staging)
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;
        add_header X-Environment "STAGING";

        # Rate limiting (more lenient for staging)
        limit_req zone=global burst=50 nodelay;

        location / {
            proxy_pass http://cmc_staging;
            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;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 128k;
            proxy_buffers 4 256k;
            proxy_busy_buffers_size 256k;
        }
    }
}