// Copyright 2020-2023 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

package pkce

import (
	"context"
	"net/url"
	"testing"
	"time"

	"github.com/ory/fosite"
	"github.com/ory/fosite/handler/pkce"
	"github.com/pkg/errors"
	"github.com/stretchr/testify/require"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/kubernetes/fake"
	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
	coretesting "k8s.io/client-go/testing"
	clocktesting "k8s.io/utils/clock/testing"

	"go.pinniped.dev/internal/federationdomain/clientregistry"
	"go.pinniped.dev/internal/psession"
	"go.pinniped.dev/internal/testutil"
)

const namespace = "test-ns"

var fakeNow = time.Date(2030, time.January, 1, 0, 0, 0, 0, time.UTC)
var lifetime = time.Minute * 10
var fakeNowPlusLifetimeAsString = metav1.Time{Time: fakeNow.Add(lifetime)}.Format(time.RFC3339)

func TestPKCEStorage(t *testing.T) {
	secretsGVR := schema.GroupVersionResource{
		Group:    "",
		Version:  "v1",
		Resource: "secrets",
	}

	wantActions := []coretesting.Action{
		coretesting.NewCreateAction(secretsGVR, namespace, &corev1.Secret{
			ObjectMeta: metav1.ObjectMeta{
				Name:            "pinniped-storage-pkce-pwu5zs7lekbhnln2w4",
				ResourceVersion: "",
				Labels: map[string]string{
					"storage.pinniped.dev/type": "pkce",
				},
				Annotations: map[string]string{
					"storage.pinniped.dev/garbage-collect-after": fakeNowPlusLifetimeAsString,
				},
			},
			Data: map[string][]byte{
				"pinniped-storage-data":    []byte(`{"request":{"id":"abcd-1","requestedAt":"0001-01-01T00:00:00Z","client":{"id":"pinny","redirect_uris":null,"grant_types":null,"response_types":null,"scopes":null,"audience":null,"public":true,"jwks_uri":"where","jwks":null,"token_endpoint_auth_method":"something","request_uris":null,"request_object_signing_alg":"","token_endpoint_auth_signing_alg":""},"scopes":null,"grantedScopes":null,"form":{"key":["val"]},"session":{"fosite":{"id_token_claims":null,"headers":null,"expires_at":null,"username":"snorlax","subject":"panda"},"custom":{"username":"fake-username","upstreamUsername":"fake-upstream-username","upstreamGroups":["fake-upstream-group1","fake-upstream-group2"],"providerUID":"fake-provider-uid","providerName":"fake-provider-name","providerType":"fake-provider-type","warnings":null,"oidc":{"upstreamRefreshToken":"fake-upstream-refresh-token","upstreamAccessToken":"","upstreamSubject":"some-subject","upstreamIssuer":"some-issuer"}}},"requestedAudience":null,"grantedAudience":null},"version":"5"}`),
				"pinniped-storage-version": []byte("1"),
			},
			Type: "storage.pinniped.dev/pkce",
		}),
		coretesting.NewGetAction(secretsGVR, namespace, "pinniped-storage-pkce-pwu5zs7lekbhnln2w4"),
		coretesting.NewDeleteAction(secretsGVR, namespace, "pinniped-storage-pkce-pwu5zs7lekbhnln2w4"),
	}

	ctx, client, _, storage := makeTestSubject()

	request := &fosite.Request{
		ID:          "abcd-1",
		RequestedAt: time.Time{},
		Client: &clientregistry.Client{
			DefaultOpenIDConnectClient: fosite.DefaultOpenIDConnectClient{
				DefaultClient: &fosite.DefaultClient{
					ID:            "pinny",
					Secret:        nil,
					RedirectURIs:  nil,
					GrantTypes:    nil,
					ResponseTypes: nil,
					Scopes:        nil,
					Audience:      nil,
					Public:        true,
				},
				JSONWebKeysURI:                    "where",
				JSONWebKeys:                       nil,
				TokenEndpointAuthMethod:           "something",
				RequestURIs:                       nil,
				RequestObjectSigningAlgorithm:     "",
				TokenEndpointAuthSigningAlgorithm: "",
			},
		},
		RequestedScope:    nil,
		GrantedScope:      nil,
		Form:              url.Values{"key": []string{"val"}},
		Session:           testutil.NewFakePinnipedSession(),
		RequestedAudience: nil,
		GrantedAudience:   nil,
	}
	err := storage.CreatePKCERequestSession(ctx, "fancy-signature", request)
	require.NoError(t, err)

	newRequest, err := storage.GetPKCERequestSession(ctx, "fancy-signature", nil)
	require.NoError(t, err)
	require.Equal(t, request, newRequest)

	err = storage.DeletePKCERequestSession(ctx, "fancy-signature")
	require.NoError(t, err)

	testutil.LogActualJSONFromCreateAction(t, client, 0) // makes it easier to update expected values when needed
	require.Equal(t, wantActions, client.Actions())
}

func TestGetNotFound(t *testing.T) {
	ctx, _, _, storage := makeTestSubject()

	_, notFoundErr := storage.GetPKCERequestSession(ctx, "non-existent-signature", nil)
	require.EqualError(t, notFoundErr, "not_found")
	require.True(t, errors.Is(notFoundErr, fosite.ErrNotFound))
}

func TestWrongVersion(t *testing.T) {
	ctx, _, secrets, storage := makeTestSubject()

	secret := &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name:            "pinniped-storage-pkce-pwu5zs7lekbhnln2w4",
			ResourceVersion: "",
			Labels: map[string]string{
				"storage.pinniped.dev/type": "pkce",
			},
			Annotations: map[string]string{
				"storage.pinniped.dev/garbage-collect-after": fakeNowPlusLifetimeAsString,
			},
		},
		Data: map[string][]byte{
			"pinniped-storage-data":    []byte(`{"request":{"id":"abcd-1"},"version":"not-the-right-version"}`),
			"pinniped-storage-version": []byte("1"),
		},
		Type: "storage.pinniped.dev/pkce",
	}
	_, err := secrets.Create(ctx, secret, metav1.CreateOptions{})
	require.NoError(t, err)

	_, err = storage.GetPKCERequestSession(ctx, "fancy-signature", nil)

	require.EqualError(t, err, "pkce request data has wrong version: pkce session for fancy-signature has version not-the-right-version instead of 5")
}

func TestNilSessionRequest(t *testing.T) {
	ctx, _, secrets, storage := makeTestSubject()

	secret := &corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name:            "pinniped-storage-pkce-pwu5zs7lekbhnln2w4",
			ResourceVersion: "",
			Labels: map[string]string{
				"storage.pinniped.dev/type": "pkce",
			},
			Annotations: map[string]string{
				"storage.pinniped.dev/garbage-collect-after": fakeNowPlusLifetimeAsString,
			},
		},
		Data: map[string][]byte{
			"pinniped-storage-data":    []byte(`{"nonsense-key": "nonsense-value","version":"5"}`),
			"pinniped-storage-version": []byte("1"),
		},
		Type: "storage.pinniped.dev/pkce",
	}

	_, err := secrets.Create(ctx, secret, metav1.CreateOptions{})
	require.NoError(t, err)

	_, err = storage.GetPKCERequestSession(ctx, "fancy-signature", nil)
	require.EqualError(t, err, "malformed pkce session for fancy-signature: pkce request data must be present")
}

func TestCreateWithNilRequester(t *testing.T) {
	ctx, _, _, storage := makeTestSubject()

	err := storage.CreatePKCERequestSession(ctx, "signature-doesnt-matter", nil)
	require.EqualError(t, err, "requester must be of type fosite.Request")
}

func TestCreateWithWrongRequesterDataTypes(t *testing.T) {
	ctx, _, _, storage := makeTestSubject()

	request := &fosite.Request{
		Session: nil,
		Client:  &clientregistry.Client{},
	}
	err := storage.CreatePKCERequestSession(ctx, "signature-doesnt-matter", request)
	require.EqualError(t, err, "requester's session must be of type PinnipedSession")

	request = &fosite.Request{
		Session: &psession.PinnipedSession{},
		Client:  nil,
	}
	err = storage.CreatePKCERequestSession(ctx, "signature-doesnt-matter", request)
	require.EqualError(t, err, "requester's client must be of type clientregistry.Client")
}

func makeTestSubject() (context.Context, *fake.Clientset, corev1client.SecretInterface, pkce.PKCERequestStorage) {
	client := fake.NewSimpleClientset()
	secrets := client.CoreV1().Secrets(namespace)
	return context.Background(), client, secrets, New(secrets, clocktesting.NewFakeClock(fakeNow).Now, lifetime)
}