package bouncer

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

// Gap (a): Registry.Register of a type implementing neither Guard nor
// CredentialGuard is already asserted by TestRegisterNeitherInterfaceNamesPluginAndName.
// This file covers the remaining Register fail-loud branches and the
// authenticate() default that Register itself makes unreachable through
// the public API.

func TestRegisterNilRegistryAndEmptyGuard(t *testing.T) {
	var nilReg *Registry
	if err := nilReg.Register("golem15.demo", "jwt", writerGuard{}); err == nil || !strings.Contains(err.Error(), "nil") {
		t.Fatalf("nil registry: %v", err)
	}
	reg := NewRegistry()
	if err := reg.Register("golem15.demo", "", writerGuard{}); err == nil || !strings.Contains(err.Error(), "golem15.demo") {
		t.Fatalf("empty name: %v", err)
	}
	if err := reg.Register("golem15.demo", "jwt", nil); err == nil || !strings.Contains(err.Error(), "jwt") {
		t.Fatalf("nil guard: %v", err)
	}
}

func TestAuthenticateDefaultNeitherInterface(t *testing.T) {
	// Register rejects this type; authenticate's default is only reachable
	// by calling it directly (same-package coverage of the fail-closed branch).
	p, cred, err := authenticate(notAGuard{}, httptest.NewRequest(http.MethodGet, "/", nil))
	if p != nil || cred != nil {
		t.Fatalf("principal=%v cred=%v", p, cred)
	}
	if err == nil || !strings.Contains(err.Error(), "neither Guard nor CredentialGuard") {
		t.Fatalf("want neither-interface error, got %v", err)
	}
}

func TestNilRegistryMiddleware(t *testing.T) {
	var nilReg *Registry
	if _, err := nilReg.Middleware("jwt"); err == nil || !strings.Contains(err.Error(), "nil") {
		t.Fatalf("nil registry Middleware: %v", err)
	}
}

func TestGuardAuthenticateSuccessAttachesUser(t *testing.T) {
	reg := NewRegistry()
	principal := &Principal{ID: 7}
	if err := reg.Register("golem15.user", "jwt", writerGuard{principal: principal}); err != nil {
		t.Fatal(err)
	}
	mw, err := reg.Middleware("jwt")
	if err != nil {
		t.Fatal(err)
	}
	h := mw(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		got, ok := User(r.Context())
		if !ok || got != principal {
			t.Fatalf("user = %+v ok=%t", got, ok)
		}
		if _, ok := Credential(r.Context()); ok {
			t.Fatal("plain Guard must not attach a credential")
		}
		w.WriteHeader(http.StatusNoContent)
	}))
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/", nil))
	if rec.Code != http.StatusNoContent {
		t.Fatalf("status = %d", rec.Code)
	}
}

func TestWithUserNilContext(t *testing.T) {
	p := &Principal{ID: 1}
	got, ok := User(WithUser(nil, p))
	if !ok || got != p {
		t.Fatalf("got %+v ok=%t", got, ok)
	}
	if _, ok := User(nil); ok {
		t.Fatal("nil context must have no user")
	}
}