package web

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestPWA(t *testing.T) {
	h := (&Server{site: defaultSite()}).Handler()
	get := func(path string) *httptest.ResponseRecorder {
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, path, nil))
		if rec.Code != http.StatusOK {
			t.Fatalf("%s: status %d", path, rec.Code)
		}
		return rec
	}

	for path, start := range map[string]string{"/manifest.webmanifest": "/", "/admin.webmanifest": "/admin"} {
		rec := get(path)
		if ct := rec.Header().Get("Content-Type"); ct != "application/manifest+json" {
			t.Errorf("%s: content type %q", path, ct)
		}
		var m manifest
		if err := json.Unmarshal(rec.Body.Bytes(), &m); err != nil {
			t.Fatalf("%s: %v", path, err)
		}
		if m.StartURL != start || m.ID != start || m.Scope != "/" || m.Display != "standalone" {
			t.Errorf("%s: %+v", path, m)
		}
		// Every icon must exist, or Chrome won't offer to install.
		for _, icon := range m.Icons {
			if ct := get(icon.Src).Header().Get("Content-Type"); ct != icon.Type {
				t.Errorf("%s: %s is %q, manifest says %q", path, icon.Src, ct, icon.Type)
			}
		}
	}

	if ct := get("/sw.js").Header().Get("Content-Type"); !strings.HasPrefix(ct, "text/javascript") {
		t.Errorf("/sw.js: content type %q", ct)
	}
	get("/static/offline.html")
}