package handlers

import (
	"fmt"
	"testing"

	"github.com/clems4ever/authelia/internal/mocks"

	"github.com/golang/mock/gomock"
	"github.com/sirupsen/logrus"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
)

type FetchSuite struct {
	suite.Suite
	mock *mocks.MockAutheliaCtx
}

func (s *FetchSuite) SetupTest() {
	s.mock = mocks.NewMockAutheliaCtx(s.T())
	// Set the intial user session.
	userSession := s.mock.Ctx.GetSession()
	userSession.Username = "john"
	userSession.AuthenticationLevel = 1
	s.mock.Ctx.SaveSession(userSession)
}

func (s *FetchSuite) TearDownTest() {
	s.mock.Close()
}

func (s *FetchSuite) setPreferencesExpectations(preferences UserPreferences) {
	s.mock.StorageProviderMock.
		EXPECT().
		LoadPrefered2FAMethod(gomock.Eq("john")).
		Return(preferences.Method, nil)

	var u2fData []byte
	if preferences.HasU2F {
		u2fData = []byte("abc")
	}

	s.mock.StorageProviderMock.
		EXPECT().
		LoadU2FDeviceHandle(gomock.Eq("john")).
		Return(u2fData, u2fData, nil)

	var totpSecret string
	if preferences.HasTOTP {
		totpSecret = "secret"
	}

	s.mock.StorageProviderMock.
		EXPECT().
		LoadTOTPSecret(gomock.Eq("john")).
		Return(totpSecret, nil)
}

func (s *FetchSuite) TestMethodSetToU2F() {
	table := []UserPreferences{
		UserPreferences{
			Method: "totp",
		},
		UserPreferences{
			Method:  "u2f",
			HasU2F:  true,
			HasTOTP: true,
		},
		UserPreferences{
			Method:  "u2f",
			HasU2F:  true,
			HasTOTP: false,
		},
	}

	for _, expectedPreferences := range table {
		s.setPreferencesExpectations(expectedPreferences)
		UserInfoGet(s.mock.Ctx)

		actualPreferences := UserPreferences{}
		s.mock.GetResponseData(s.T(), &actualPreferences)

		s.Run("expected method", func() {
			s.Assert().Equal(expectedPreferences.Method, actualPreferences.Method)
		})

		s.Run("registered u2f", func() {
			s.Assert().Equal(expectedPreferences.HasU2F, actualPreferences.HasU2F)
		})

		s.Run("registered totp", func() {
			s.Assert().Equal(expectedPreferences.HasTOTP, actualPreferences.HasTOTP)
		})
	}
}

func (s *FetchSuite) TestShouldGetDefaultPreferenceIfNotInDB() {
	s.mock.StorageProviderMock.
		EXPECT().
		LoadPrefered2FAMethod(gomock.Eq("john")).
		Return("", nil)

	s.mock.StorageProviderMock.
		EXPECT().
		LoadU2FDeviceHandle(gomock.Eq("john")).
		Return(nil, nil, nil)

	s.mock.StorageProviderMock.
		EXPECT().
		LoadTOTPSecret(gomock.Eq("john")).
		Return("", nil)

	UserInfoGet(s.mock.Ctx)
	s.mock.Assert200OK(s.T(), UserPreferences{Method: "totp"})
}

func (s *FetchSuite) TestShouldReturnError500WhenStorageFailsToLoad() {
	s.mock.StorageProviderMock.EXPECT().
		LoadPrefered2FAMethod(gomock.Eq("john")).
		Return("", fmt.Errorf("Failure"))
	UserInfoGet(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unable to load prefered 2FA method: Failure", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func TestFetchSuite(t *testing.T) {
	suite.Run(t, &FetchSuite{})
}

type SaveSuite struct {
	suite.Suite
	mock *mocks.MockAutheliaCtx
}

func (s *SaveSuite) SetupTest() {
	s.mock = mocks.NewMockAutheliaCtx(s.T())
	// Set the intial user session.
	userSession := s.mock.Ctx.GetSession()
	userSession.Username = "john"
	userSession.AuthenticationLevel = 1
	s.mock.Ctx.SaveSession(userSession)
}

func (s *SaveSuite) TearDownTest() {
	s.mock.Close()
}

func (s *SaveSuite) TestShouldReturnError500WhenNoBodyProvided() {
	s.mock.Ctx.Request.SetBody(nil)
	MethodPreferencePost(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unable to parse body: unexpected end of JSON input", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func (s *SaveSuite) TestShouldReturnError500WhenMalformedBodyProvided() {
	s.mock.Ctx.Request.SetBody([]byte("{\"method\":\"abc\""))
	MethodPreferencePost(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unable to parse body: unexpected end of JSON input", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func (s *SaveSuite) TestShouldReturnError500WhenBadBodyProvided() {
	s.mock.Ctx.Request.SetBody([]byte("{\"weird_key\":\"abc\"}"))
	MethodPreferencePost(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unable to validate body: method: non zero value required", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func (s *SaveSuite) TestShouldReturnError500WhenBadMethodProvided() {
	s.mock.Ctx.Request.SetBody([]byte("{\"method\":\"abc\"}"))
	MethodPreferencePost(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unknown method 'abc', it should be one of totp, u2f, mobile_push", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func (s *SaveSuite) TestShouldReturnError500WhenDatabaseFailsToSave() {
	s.mock.Ctx.Request.SetBody([]byte("{\"method\":\"u2f\"}"))
	s.mock.StorageProviderMock.EXPECT().
		SavePrefered2FAMethod(gomock.Eq("john"), gomock.Eq("u2f")).
		Return(fmt.Errorf("Failure"))

	MethodPreferencePost(s.mock.Ctx)

	s.mock.Assert200KO(s.T(), "Operation failed.")
	assert.Equal(s.T(), "Unable to save new prefered 2FA method: Failure", s.mock.Hook.LastEntry().Message)
	assert.Equal(s.T(), logrus.ErrorLevel, s.mock.Hook.LastEntry().Level)
}

func (s *SaveSuite) TestShouldReturn200WhenMethodIsSuccessfullySaved() {
	s.mock.Ctx.Request.SetBody([]byte("{\"method\":\"u2f\"}"))
	s.mock.StorageProviderMock.EXPECT().
		SavePrefered2FAMethod(gomock.Eq("john"), gomock.Eq("u2f")).
		Return(nil)

	MethodPreferencePost(s.mock.Ctx)

	assert.Equal(s.T(), 200, s.mock.Ctx.Response.StatusCode())
}

func TestSaveSuite(t *testing.T) {
	suite.Run(t, &SaveSuite{})
}