worker_processes 1;

events {
    worker_connections 1024;
}

http {
    server {
        # Listen on port 80
        listen 80;
        
        # Define the server name
        server_name localhost;

        # Root location block
        location / {
            # Serve static files from this directory
            root /usr/share/nginx/html;
            
            # Default index file
            index index.html;
            
            # Try to serve the file, if not found, serve index.html (for single-page applications)
            try_files $uri $uri/ /index.html;
        }

        # Location block for /upload endpoint
        location /upload {
            # Proxy the request to the backend service
            proxy_pass http://backend:8000/upload;
            
            # Include the common proxy headers
            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;
            
            # Include the common CORS headers
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'Origin, Content-Type, Accept, Authorization';
        }

        # Location block for /retrieve_from_path endpoint
        location /retrieve_from_path {
            # Proxy the request to the backend service
            proxy_pass http://backend:8000/retrieve_from_path;
            
            # Include the common proxy headers
            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;
            
            # Include the common CORS headers
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'Origin, Content-Type, Accept, Authorization';
        }

        # Error page handling
        error_page 500 502 503 504 /50x.html;
        
        # Location block for the custom error page
        location = /50x.html {
            # Serve the error page from this directory
            root /usr/share/nginx/html;
        }
    }
}