//go:build integration

package session_test

import (
	"context"
	"fmt"
	"os"
	"testing"
	"time"

	"github.com/muhlemmer/gu"
	"github.com/pquerna/otp/totp"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"google.golang.org/grpc/metadata"

	"github.com/zitadel/zitadel/internal/integration"
	object "github.com/zitadel/zitadel/pkg/grpc/object/v2alpha"
	session "github.com/zitadel/zitadel/pkg/grpc/session/v2alpha"
	user "github.com/zitadel/zitadel/pkg/grpc/user/v2alpha"
)

var (
	CTX    context.Context
	Tester *integration.Tester
	Client session.SessionServiceClient
	User   *user.AddHumanUserResponse
)

func TestMain(m *testing.M) {
	os.Exit(func() int {
		ctx, errCtx, cancel := integration.Contexts(5 * time.Minute)
		defer cancel()

		Tester = integration.NewTester(ctx)
		defer Tester.Done()
		Client = Tester.Client.SessionV2

		CTX, _ = Tester.WithAuthorization(ctx, integration.OrgOwner), errCtx
		User = Tester.CreateHumanUser(CTX)
		Tester.SetUserPassword(CTX, User.GetUserId(), integration.UserPassword)
		Tester.RegisterUserPasskey(CTX, User.GetUserId())
		return m.Run()
	}())
}

func verifyCurrentSession(t testing.TB, id, token string, sequence uint64, window time.Duration, metadata map[string][]byte, factors ...wantFactor) *session.Session {
	t.Helper()
	require.NotEmpty(t, id)
	require.NotEmpty(t, token)

	resp, err := Client.GetSession(CTX, &session.GetSessionRequest{
		SessionId:    id,
		SessionToken: &token,
	})
	require.NoError(t, err)
	s := resp.GetSession()

	assert.Equal(t, id, s.GetId())
	assert.WithinRange(t, s.GetCreationDate().AsTime(), time.Now().Add(-window), time.Now().Add(window))
	assert.WithinRange(t, s.GetChangeDate().AsTime(), time.Now().Add(-window), time.Now().Add(window))
	assert.Equal(t, sequence, s.GetSequence())
	assert.Equal(t, metadata, s.GetMetadata())
	verifyFactors(t, s.GetFactors(), window, factors)
	return s
}

type wantFactor int

const (
	wantUserFactor wantFactor = iota
	wantPasswordFactor
	wantWebAuthNFactor
	wantWebAuthNFactorUserVerified
	wantTOTPFactor
	wantIntentFactor
)

func verifyFactors(t testing.TB, factors *session.Factors, window time.Duration, want []wantFactor) {
	for _, w := range want {
		switch w {
		case wantUserFactor:
			uf := factors.GetUser()
			assert.NotNil(t, uf)
			assert.WithinRange(t, uf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
			assert.Equal(t, User.GetUserId(), uf.GetId())
		case wantPasswordFactor:
			pf := factors.GetPassword()
			assert.NotNil(t, pf)
			assert.WithinRange(t, pf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
		case wantWebAuthNFactor:
			pf := factors.GetWebAuthN()
			assert.NotNil(t, pf)
			assert.WithinRange(t, pf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
			assert.False(t, pf.GetUserVerified())
		case wantWebAuthNFactorUserVerified:
			pf := factors.GetWebAuthN()
			assert.NotNil(t, pf)
			assert.WithinRange(t, pf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
			assert.True(t, pf.GetUserVerified())
		case wantTOTPFactor:
			pf := factors.GetTotp()
			assert.NotNil(t, pf)
			assert.WithinRange(t, pf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
		case wantIntentFactor:
			pf := factors.GetIntent()
			assert.NotNil(t, pf)
			assert.WithinRange(t, pf.GetVerifiedAt().AsTime(), time.Now().Add(-window), time.Now().Add(window))
		}
	}
}

func TestServer_CreateSession(t *testing.T) {
	tests := []struct {
		name        string
		req         *session.CreateSessionRequest
		want        *session.CreateSessionResponse
		wantErr     bool
		wantFactors []wantFactor
	}{
		{
			name: "empty session",
			req: &session.CreateSessionRequest{
				Metadata: map[string][]byte{"foo": []byte("bar")},
			},
			want: &session.CreateSessionResponse{
				Details: &object.Details{
					ResourceOwner: Tester.Organisation.ID,
				},
			},
		},
		{
			name: "with user",
			req: &session.CreateSessionRequest{
				Checks: &session.Checks{
					User: &session.CheckUser{
						Search: &session.CheckUser_UserId{
							UserId: User.GetUserId(),
						},
					},
				},
				Metadata: map[string][]byte{"foo": []byte("bar")},
			},
			want: &session.CreateSessionResponse{
				Details: &object.Details{
					ResourceOwner: Tester.Organisation.ID,
				},
			},
			wantFactors: []wantFactor{wantUserFactor},
		},
		{
			name: "password without user error",
			req: &session.CreateSessionRequest{
				Checks: &session.Checks{
					Password: &session.CheckPassword{
						Password: "Difficult",
					},
				},
			},
			wantErr: true,
		},
		{
			name: "passkey without user error",
			req: &session.CreateSessionRequest{
				Challenges: &session.RequestChallenges{
					WebAuthN: &session.RequestChallenges_WebAuthN{
						Domain:                      Tester.Config.ExternalDomain,
						UserVerificationRequirement: session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_REQUIRED,
					},
				},
			},
			wantErr: true,
		},
		{
			name: "passkey without domain (not registered) error",
			req: &session.CreateSessionRequest{
				Checks: &session.Checks{
					User: &session.CheckUser{
						Search: &session.CheckUser_UserId{
							UserId: User.GetUserId(),
						},
					},
				},
				Challenges: &session.RequestChallenges{
					WebAuthN: &session.RequestChallenges_WebAuthN{
						UserVerificationRequirement: session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_REQUIRED,
					},
				},
			},
			wantErr: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := Client.CreateSession(CTX, tt.req)
			if tt.wantErr {
				require.Error(t, err)
				return
			}
			require.NoError(t, err)
			integration.AssertDetails(t, tt.want, got)

			verifyCurrentSession(t, got.GetSessionId(), got.GetSessionToken(), got.GetDetails().GetSequence(), time.Minute, tt.req.GetMetadata(), tt.wantFactors...)
		})
	}
}

func TestServer_CreateSession_webauthn(t *testing.T) {
	// create new session with user and request the webauthn challenge
	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{
		Checks: &session.Checks{
			User: &session.CheckUser{
				Search: &session.CheckUser_UserId{
					UserId: User.GetUserId(),
				},
			},
		},
		Challenges: &session.RequestChallenges{
			WebAuthN: &session.RequestChallenges_WebAuthN{
				Domain:                      Tester.Config.ExternalDomain,
				UserVerificationRequirement: session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_REQUIRED,
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), createResp.GetSessionToken(), createResp.GetDetails().GetSequence(), time.Minute, nil)

	assertionData, err := Tester.WebAuthN.CreateAssertionResponse(createResp.GetChallenges().GetWebAuthN().GetPublicKeyCredentialRequestOptions(), true)
	require.NoError(t, err)

	// update the session with webauthn assertion data
	updateResp, err := Client.SetSession(CTX, &session.SetSessionRequest{
		SessionId:    createResp.GetSessionId(),
		SessionToken: createResp.GetSessionToken(),
		Checks: &session.Checks{
			WebAuthN: &session.CheckWebAuthN{
				CredentialAssertionData: assertionData,
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), updateResp.GetSessionToken(), updateResp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantWebAuthNFactorUserVerified)
}

func TestServer_CreateSession_successfulIntent(t *testing.T) {
	idpID := Tester.AddGenericOAuthProvider(t)

	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{
		Checks: &session.Checks{
			User: &session.CheckUser{
				Search: &session.CheckUser_UserId{
					UserId: User.GetUserId(),
				},
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), createResp.GetSessionToken(), createResp.GetDetails().GetSequence(), time.Minute, nil)

	intentID, token, _, _ := Tester.CreateSuccessfulOAuthIntent(t, idpID, User.GetUserId(), "id")
	updateResp, err := Client.SetSession(CTX, &session.SetSessionRequest{
		SessionId:    createResp.GetSessionId(),
		SessionToken: createResp.GetSessionToken(),
		Checks: &session.Checks{
			Intent: &session.CheckIntent{
				IntentId: intentID,
				Token:    token,
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), updateResp.GetSessionToken(), updateResp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantIntentFactor)
}

func TestServer_CreateSession_successfulIntentUnknownUserID(t *testing.T) {
	idpID := Tester.AddGenericOAuthProvider(t)

	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{
		Checks: &session.Checks{
			User: &session.CheckUser{
				Search: &session.CheckUser_UserId{
					UserId: User.GetUserId(),
				},
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), createResp.GetSessionToken(), createResp.GetDetails().GetSequence(), time.Minute, nil)

	idpUserID := "id"
	intentID, token, _, _ := Tester.CreateSuccessfulOAuthIntent(t, idpID, "", idpUserID)
	updateResp, err := Client.SetSession(CTX, &session.SetSessionRequest{
		SessionId:    createResp.GetSessionId(),
		SessionToken: createResp.GetSessionToken(),
		Checks: &session.Checks{
			Intent: &session.CheckIntent{
				IntentId: intentID,
				Token:    token,
			},
		},
	})
	require.Error(t, err)
	Tester.CreateUserIDPlink(CTX, User.GetUserId(), idpUserID, idpID, User.GetUserId())
	updateResp, err = Client.SetSession(CTX, &session.SetSessionRequest{
		SessionId:    createResp.GetSessionId(),
		SessionToken: createResp.GetSessionToken(),
		Checks: &session.Checks{
			Intent: &session.CheckIntent{
				IntentId: intentID,
				Token:    token,
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), updateResp.GetSessionToken(), updateResp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantIntentFactor)
}

func TestServer_CreateSession_startedIntentFalseToken(t *testing.T) {
	idpID := Tester.AddGenericOAuthProvider(t)

	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{
		Checks: &session.Checks{
			User: &session.CheckUser{
				Search: &session.CheckUser_UserId{
					UserId: User.GetUserId(),
				},
			},
		},
	})
	require.NoError(t, err)
	verifyCurrentSession(t, createResp.GetSessionId(), createResp.GetSessionToken(), createResp.GetDetails().GetSequence(), time.Minute, nil)

	intentID := Tester.CreateIntent(t, idpID)
	_, err = Client.SetSession(CTX, &session.SetSessionRequest{
		SessionId:    createResp.GetSessionId(),
		SessionToken: createResp.GetSessionToken(),
		Checks: &session.Checks{
			Intent: &session.CheckIntent{
				IntentId: intentID,
				Token:    "false",
			},
		},
	})
	require.Error(t, err)
}

func registerTOTP(ctx context.Context, t *testing.T, userID string) (secret string) {
	resp, err := Tester.Client.UserV2.RegisterTOTP(ctx, &user.RegisterTOTPRequest{
		UserId: userID,
	})
	require.NoError(t, err)
	secret = resp.GetSecret()
	code, err := totp.GenerateCode(secret, time.Now())
	require.NoError(t, err)

	_, err = Tester.Client.UserV2.VerifyTOTPRegistration(ctx, &user.VerifyTOTPRegistrationRequest{
		UserId: userID,
		Code:   code,
	})
	require.NoError(t, err)
	return secret
}

func TestServer_SetSession_flow(t *testing.T) {
	// create new, empty session
	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{})
	require.NoError(t, err)
	sessionToken := createResp.GetSessionToken()
	verifyCurrentSession(t, createResp.GetSessionId(), sessionToken, createResp.GetDetails().GetSequence(), time.Minute, nil)

	t.Run("check user", func(t *testing.T) {
		resp, err := Client.SetSession(CTX, &session.SetSessionRequest{
			SessionId:    createResp.GetSessionId(),
			SessionToken: sessionToken,
			Checks: &session.Checks{
				User: &session.CheckUser{
					Search: &session.CheckUser_UserId{
						UserId: User.GetUserId(),
					},
				},
			},
		})
		require.NoError(t, err)
		sessionToken = resp.GetSessionToken()
		verifyCurrentSession(t, createResp.GetSessionId(), sessionToken, resp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor)
	})

	t.Run("check webauthn, user verified (passkey)", func(t *testing.T) {
		resp, err := Client.SetSession(CTX, &session.SetSessionRequest{
			SessionId:    createResp.GetSessionId(),
			SessionToken: sessionToken,
			Challenges: &session.RequestChallenges{
				WebAuthN: &session.RequestChallenges_WebAuthN{
					Domain:                      Tester.Config.ExternalDomain,
					UserVerificationRequirement: session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_REQUIRED,
				},
			},
		})
		require.NoError(t, err)
		verifyCurrentSession(t, createResp.GetSessionId(), resp.GetSessionToken(), resp.GetDetails().GetSequence(), time.Minute, nil)
		sessionToken = resp.GetSessionToken()

		assertionData, err := Tester.WebAuthN.CreateAssertionResponse(resp.GetChallenges().GetWebAuthN().GetPublicKeyCredentialRequestOptions(), true)
		require.NoError(t, err)

		resp, err = Client.SetSession(CTX, &session.SetSessionRequest{
			SessionId:    createResp.GetSessionId(),
			SessionToken: sessionToken,
			Checks: &session.Checks{
				WebAuthN: &session.CheckWebAuthN{
					CredentialAssertionData: assertionData,
				},
			},
		})
		require.NoError(t, err)
		sessionToken = resp.GetSessionToken()
		verifyCurrentSession(t, createResp.GetSessionId(), sessionToken, resp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantWebAuthNFactorUserVerified)
	})

	userAuthCtx := Tester.WithAuthorizationToken(CTX, sessionToken)
	Tester.RegisterUserU2F(userAuthCtx, User.GetUserId())
	totpSecret := registerTOTP(userAuthCtx, t, User.GetUserId())

	t.Run("check webauthn, user not verified (U2F)", func(t *testing.T) {

		for _, userVerificationRequirement := range []session.UserVerificationRequirement{
			session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_PREFERRED,
			session.UserVerificationRequirement_USER_VERIFICATION_REQUIREMENT_DISCOURAGED,
		} {
			t.Run(userVerificationRequirement.String(), func(t *testing.T) {
				resp, err := Client.SetSession(CTX, &session.SetSessionRequest{
					SessionId:    createResp.GetSessionId(),
					SessionToken: sessionToken,
					Challenges: &session.RequestChallenges{
						WebAuthN: &session.RequestChallenges_WebAuthN{
							Domain:                      Tester.Config.ExternalDomain,
							UserVerificationRequirement: userVerificationRequirement,
						},
					},
				})
				require.NoError(t, err)
				verifyCurrentSession(t, createResp.GetSessionId(), resp.GetSessionToken(), resp.GetDetails().GetSequence(), time.Minute, nil)
				sessionToken = resp.GetSessionToken()

				assertionData, err := Tester.WebAuthN.CreateAssertionResponse(resp.GetChallenges().GetWebAuthN().GetPublicKeyCredentialRequestOptions(), false)
				require.NoError(t, err)

				resp, err = Client.SetSession(CTX, &session.SetSessionRequest{
					SessionId:    createResp.GetSessionId(),
					SessionToken: sessionToken,
					Checks: &session.Checks{
						WebAuthN: &session.CheckWebAuthN{
							CredentialAssertionData: assertionData,
						},
					},
				})
				require.NoError(t, err)
				sessionToken = resp.GetSessionToken()
				verifyCurrentSession(t, createResp.GetSessionId(), sessionToken, resp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantWebAuthNFactor)
			})
		}
	})

	t.Run("check TOTP", func(t *testing.T) {
		code, err := totp.GenerateCode(totpSecret, time.Now())
		require.NoError(t, err)
		resp, err := Client.SetSession(CTX, &session.SetSessionRequest{
			SessionId:    createResp.GetSessionId(),
			SessionToken: sessionToken,
			Checks: &session.Checks{
				Totp: &session.CheckTOTP{
					Totp: code,
				},
			},
		})
		require.NoError(t, err)
		sessionToken = resp.GetSessionToken()
		verifyCurrentSession(t, createResp.GetSessionId(), sessionToken, resp.GetDetails().GetSequence(), time.Minute, nil, wantUserFactor, wantWebAuthNFactor, wantTOTPFactor)
	})
}

func Test_ZITADEL_API_missing_authentication(t *testing.T) {
	// create new, empty session
	createResp, err := Client.CreateSession(CTX, &session.CreateSessionRequest{})
	require.NoError(t, err)

	ctx := metadata.AppendToOutgoingContext(context.Background(), "Authorization", fmt.Sprintf("Bearer %s", createResp.GetSessionToken()))
	sessionResp, err := Tester.Client.SessionV2.GetSession(ctx, &session.GetSessionRequest{SessionId: createResp.GetSessionId()})
	require.Error(t, err)
	require.Nil(t, sessionResp)
}

func Test_ZITADEL_API_missing_mfa(t *testing.T) {
	id, token, _, _ := Tester.CreatePasswordSession(t, CTX, User.GetUserId(), integration.UserPassword)

	ctx := Tester.WithAuthorizationToken(context.Background(), token)
	sessionResp, err := Tester.Client.SessionV2.GetSession(ctx, &session.GetSessionRequest{SessionId: id})
	require.Error(t, err)
	require.Nil(t, sessionResp)
}

func Test_ZITADEL_API_success(t *testing.T) {
	id, token, _, _ := Tester.CreateVerfiedWebAuthNSession(t, CTX, User.GetUserId())

	ctx := Tester.WithAuthorizationToken(context.Background(), token)
	sessionResp, err := Tester.Client.SessionV2.GetSession(ctx, &session.GetSessionRequest{SessionId: id})
	require.NoError(t, err)

	webAuthN := sessionResp.GetSession().GetFactors().GetWebAuthN()
	require.NotNil(t, id, webAuthN.GetVerifiedAt().AsTime())
	require.True(t, webAuthN.GetUserVerified())
}

func Test_ZITADEL_API_session_not_found(t *testing.T) {
	id, token, _, _ := Tester.CreateVerfiedWebAuthNSession(t, CTX, User.GetUserId())

	// test session token works
	ctx := Tester.WithAuthorizationToken(context.Background(), token)
	_, err := Tester.Client.SessionV2.GetSession(ctx, &session.GetSessionRequest{SessionId: id})
	require.NoError(t, err)

	//terminate the session and test it does not work anymore
	_, err = Tester.Client.SessionV2.DeleteSession(CTX, &session.DeleteSessionRequest{
		SessionId:    id,
		SessionToken: gu.Ptr(token),
	})
	require.NoError(t, err)
	ctx = Tester.WithAuthorizationToken(context.Background(), token)
	_, err = Tester.Client.SessionV2.GetSession(ctx, &session.GetSessionRequest{SessionId: id})
	require.Error(t, err)
}