# Rate limiting zone for external National ID API (2 requests/second per IP)
limit_req_zone $binary_remote_addr zone=external_nationalid:10m rate=2r/s;

server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # Fineract API proxy
    location /fineract-provider/ {
        proxy_pass ${FINERACT_API_URL}/;
        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;
    }

    # External National ID API proxy (only if configured)
    location /external-nationalid {
        # Use Docker DNS resolver for upstream resolution
        resolver 127.0.0.11 valid=30s;

        # Rate limit to prevent abuse of the upstream National ID API
        limit_req zone=external_nationalid burst=5 nodelay;

        # Read target from env var at runtime (set via envsubst on container start)
        set $external_nationalid_target "${EXTERNAL_NATIONALID_API_URL}";

        # Rewrite path: strip /external-nationalid prefix before proxying
        rewrite ^/external-nationalid(.*)$ $1 break;

        proxy_pass $external_nationalid_target;
        proxy_set_header Host $proxy_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;

        # Inject API key server-side so it is never exposed to the browser
        proxy_set_header ${EXTERNAL_NATIONAL_ID_SYSTEM_API_HEADER} "${EXTERNAL_NATIONAL_ID_SYSTEM_API_KEY}";

        # Pass through the original headers from the client
        proxy_pass_request_headers on;

        # CORS is not needed since requests come from the same origin
    }

    # Angular app - serve index.html for all routes
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}