package server

import (
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"
	"testing/fstest"
)

// Static files carry an ETag, so a browser's revalidation of an unchanged
// file is a 304 without a body.
func TestStaticETags(t *testing.T) {
	web := fstest.MapFS{
		"index.html":     {Data: []byte("<!doctype html><title>Jarl</title>")},
		"assets/logo.js": {Data: []byte("export const x = 1;\n")},
	}
	s := &Server{cfg: Config{}, log: slog.New(slog.NewTextHandler(io.Discard, nil)), mux: http.NewServeMux(), limiter: newRateLimiter(), web: web}
	s.routes()
	for _, path := range []string{"/", "/assets/logo.js"} {
		w := httptest.NewRecorder()
		s.mux.ServeHTTP(w, httptest.NewRequest("GET", path, nil))
		tag := w.Header().Get("ETag")
		if w.Code != 200 || tag == "" || w.Body.Len() == 0 {
			t.Fatalf("%s: %d etag %q", path, w.Code, tag)
		}
		r := httptest.NewRequest("GET", path, nil)
		r.Header.Set("If-None-Match", tag)
		w = httptest.NewRecorder()
		s.mux.ServeHTTP(w, r)
		if w.Code != http.StatusNotModified || w.Body.Len() != 0 {
			t.Errorf("%s revalidated: %d, %d bytes", path, w.Code, w.Body.Len())
		}
	}
}