package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/niels/banking-app/backend/internal/platform/correlation"
)

func TestRequestIDAddsCorrelationHeadersAndContext(t *testing.T) {
	t.Parallel()

	handler := RequestID(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if RequestIDFrom(r.Context()) != "req-test" {
			t.Fatalf("request id from context = %q", RequestIDFrom(r.Context()))
		}
		if TraceIDFrom(r.Context()) != "4bf92f3577b34da6a3ce929d0e0e4736" {
			t.Fatalf("trace id from context = %q", TraceIDFrom(r.Context()))
		}
		w.WriteHeader(http.StatusNoContent)
	}))
	request := httptest.NewRequest(http.MethodGet, "/", nil)
	request.Header.Set(correlation.HeaderRequestID, "req-test")
	request.Header.Set(correlation.HeaderTraceParent, "00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01")
	recorder := httptest.NewRecorder()

	handler.ServeHTTP(recorder, request)

	if got := recorder.Header().Get(correlation.HeaderRequestID); got != "req-test" {
		t.Fatalf("response request id = %q", got)
	}
	if got := recorder.Header().Get(correlation.HeaderTraceParent); got == "" {
		t.Fatal("expected response traceparent")
	}
}