# Production environment configuration
upstream cmc_php_production {
    server cmc-php-production:80;
    keepalive 32;
}

upstream cmc_go_production {
    server cmc-go-production:8080;
    keepalive 32;
}

# Rate limiting
limit_req_zone $binary_remote_addr zone=login:10m rate=5r/m;
limit_req_zone $binary_remote_addr zone=api:10m rate=30r/m;

server {
    server_name cmc.springupsoftware.com;
    
    # Basic auth for production
    auth_basic_user_file /etc/nginx/userpasswd;
    auth_basic "CMC Sales - Restricted Access";
    
    # Security headers
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header Referrer-Policy "strict-origin-when-cross-origin";
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    # Hide server information
    server_tokens off;
    
    # Request size limits
    client_max_body_size 50M;
    client_body_timeout 30s;
    client_header_timeout 30s;
    
    # Compression
    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;
    
    # CakePHP legacy app routes
    location / {
        limit_req zone=api burst=10 nodelay;
        
        proxy_pass http://cmc_php_production;
        proxy_read_timeout 300s;
        proxy_connect_timeout 10s;
        proxy_send_timeout 30s;
        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 for better performance
        proxy_buffering on;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;
    }
    
    # Go API routes
    location /api/ {
        limit_req zone=api burst=20 nodelay;
        
        proxy_pass http://cmc_go_production;
        proxy_read_timeout 300s;
        proxy_connect_timeout 10s;
        proxy_send_timeout 30s;
        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 for better performance
        proxy_buffering on;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;
    }
    
    # Go page routes for emails
    location ~ ^/(emails|customers|products|purchase-orders|enquiries|documents) {
        limit_req zone=api burst=15 nodelay;
        
        proxy_pass http://cmc_go_production;
        proxy_read_timeout 300s;
        proxy_connect_timeout 10s;
        proxy_send_timeout 30s;
        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 for better performance
        proxy_buffering on;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;
    }
    
    # Static files from Go app with aggressive caching
    location /static/ {
        proxy_pass http://cmc_go_production;
        proxy_cache_valid 200 24h;
        add_header Cache-Control "public, max-age=86400";
        expires 1d;
    }
    
    # PDF files with caching
    location /pdf/ {
        proxy_pass http://cmc_go_production;
        proxy_cache_valid 200 1h;
        add_header Cache-Control "public, max-age=3600";
        expires 1h;
    }
    
    # Health check endpoints (no rate limiting)
    location /health {
        proxy_pass http://cmc_go_production/api/v1/health;
        access_log off;
    }
    
    # Block common attack patterns
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~ ~$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    # Error pages
    error_page 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
    
    # Custom error page for rate limiting
    error_page 429 /429.html;
    location = /429.html {
        root /usr/share/nginx/html;
    }

    listen 80;
}