package database

import (
	"context"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/require"

	"github.com/grafana/grafana/pkg/infra/db"
	"github.com/grafana/grafana/pkg/login/social"
	"github.com/grafana/grafana/pkg/services/sqlstore"
	"github.com/grafana/grafana/pkg/services/ssosettings"
	"github.com/grafana/grafana/pkg/services/ssosettings/models"
)

func TestIntegrationGetSSOSettings(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test")
	}

	var sqlStore *sqlstore.SQLStore
	var ssoSettingsStore *SSOSettingsStore

	setup := func() {
		sqlStore = db.InitTestDB(t)
		ssoSettingsStore = ProvideStore(sqlStore)

		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
		}
		err := populateSSOSettings(sqlStore, template, "azuread")
		require.NoError(t, err)
	}

	t.Run("returns existing SSO settings", func(t *testing.T) {
		setup()

		expected := &models.SSOSettings{
			Provider:      "azuread",
			OAuthSettings: &social.OAuthInfo{Enabled: true},
		}

		actual, err := ssoSettingsStore.Get(context.Background(), "azuread")
		require.NoError(t, err)

		require.Equal(t, expected.OAuthSettings, actual.OAuthSettings)
	})

	t.Run("returns not found if the SSO setting is missing for the specified provider", func(t *testing.T) {
		setup()

		_, err := ssoSettingsStore.Get(context.Background(), "okta")
		require.ErrorAs(t, err, &ssosettings.ErrNotFound)
	})

	t.Run("returns not found if the SSO setting is soft deleted for the specified provider", func(t *testing.T) {
		setup()
		err := ssoSettingsStore.Delete(context.Background(), "azuread")
		require.NoError(t, err)

		_, err = ssoSettingsStore.Get(context.Background(), "azuread")
		require.ErrorAs(t, err, &ssosettings.ErrNotFound)
	})
}

func TestIntegrationUpsertSSOSettings(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test")
	}

	var sqlStore *sqlstore.SQLStore
	var ssoSettingsStore *SSOSettingsStore

	setup := func() {
		sqlStore = db.InitTestDB(t)
		ssoSettingsStore = ProvideStore(sqlStore)
	}

	t.Run("insert a new SSO setting successfully", func(t *testing.T) {
		setup()

		mockTimeNow(time.Now())
		defer resetTimeNow()

		settings := models.SSOSettings{
			Provider: "azuread",
			OAuthSettings: &social.OAuthInfo{
				Enabled:  true,
				ClientId: "azuread-client",
			},
		}

		err := ssoSettingsStore.Upsert(context.Background(), settings)
		require.NoError(t, err)

		actual, err := getSSOSettingsByProvider(sqlStore, settings.Provider, false)
		require.NoError(t, err)
		require.EqualValues(t, settings.OAuthSettings, actual.OAuthSettings)
		require.NotEmpty(t, actual.ID)
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Created))
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Updated))

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, 0, deleted)
		require.EqualValues(t, 1, notDeleted)
	})

	t.Run("replaces an existing SSO setting for the specified provider", func(t *testing.T) {
		setup()

		mockTimeNow(time.Now())
		defer resetTimeNow()

		provider := "github"
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "github-client",
				ClientSecret: "this-is-a-secret",
			},
		}
		err := populateSSOSettings(sqlStore, template, provider)
		require.NoError(t, err)

		newSettings := models.SSOSettings{
			Provider: provider,
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "new-github-client",
				ClientSecret: "this-is-a-new-secret",
			},
		}
		err = ssoSettingsStore.Upsert(context.Background(), newSettings)
		require.NoError(t, err)

		actual, err := getSSOSettingsByProvider(sqlStore, provider, false)
		require.NoError(t, err)
		require.Equal(t, newSettings.OAuthSettings, actual.OAuthSettings)
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Updated))

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, 0, deleted)
		require.EqualValues(t, 1, notDeleted)
	})

	t.Run("trying to update a deleted SSO Settings will insert a new record", func(t *testing.T) {
		setup()

		mockTimeNow(time.Now())
		defer resetTimeNow()

		provider := "azuread"
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "azuread-client",
				ClientSecret: "this-is-a-secret",
			},
			IsDeleted: true,
		}
		err := populateSSOSettings(sqlStore, template, provider)
		require.NoError(t, err)

		newSettings := models.SSOSettings{
			Provider: provider,
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "new-azuread-client",
				ClientSecret: "this-is-a-new-secret",
			},
		}

		err = ssoSettingsStore.Upsert(context.Background(), newSettings)
		require.NoError(t, err)

		actual, err := getSSOSettingsByProvider(sqlStore, provider, false)
		require.NoError(t, err)
		require.Equal(t, newSettings.OAuthSettings, actual.OAuthSettings)
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Created))
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Updated))

		old, err := getSSOSettingsByProvider(sqlStore, provider, true)
		require.NoError(t, err)
		require.Equal(t, template.OAuthSettings, old.OAuthSettings)
	})

	t.Run("replaces the settings only for the specified provider leaving the other provider's settings unchanged", func(t *testing.T) {
		setup()

		mockTimeNow(time.Now())
		defer resetTimeNow()

		providers := []string{"github", "gitlab", "google"}
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "my-client",
				ClientSecret: "this-is-a-secret",
			},
		}
		err := populateSSOSettings(sqlStore, template, providers...)
		require.NoError(t, err)

		newSettings := models.SSOSettings{
			Provider: providers[0],
			OAuthSettings: &social.OAuthInfo{
				Enabled:      true,
				ClientId:     "my-new-client",
				ClientSecret: "this-is-my-new-secret",
			},
		}
		err = ssoSettingsStore.Upsert(context.Background(), newSettings)
		require.NoError(t, err)

		actual, err := getSSOSettingsByProvider(sqlStore, providers[0], false)
		require.NoError(t, err)
		require.Equal(t, newSettings.OAuthSettings, actual.OAuthSettings)
		require.Equal(t, formatTime(timeNow().UTC()), formatTime(actual.Updated))

		for index := 1; index < len(providers); index++ {
			existing, err := getSSOSettingsByProvider(sqlStore, providers[index], false)
			require.NoError(t, err)
			require.EqualValues(t, template.OAuthSettings, existing.OAuthSettings)
		}
	})
}

func TestIntegrationListSSOSettings(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test")
	}

	var sqlStore *sqlstore.SQLStore
	var ssoSettingsStore *SSOSettingsStore

	setup := func() {
		sqlStore = db.InitTestDB(t)
		ssoSettingsStore = ProvideStore(sqlStore)

		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
		}
		err := populateSSOSettings(sqlStore, template, "azuread")
		require.NoError(t, err)

		template = models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: false,
			},
		}
		err = populateSSOSettings(sqlStore, template, "okta")
		require.NoError(t, err)
	}

	t.Run("returns every SSO settings successfully", func(t *testing.T) {
		setup()

		list, err := ssoSettingsStore.List(context.Background())

		require.NoError(t, err)
		require.Equal(t, 2, len(list))
	})
}

func TestIntegrationDeleteSSOSettings(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping integration test")
	}

	var sqlStore *sqlstore.SQLStore
	var ssoSettingsStore *SSOSettingsStore

	setup := func() {
		sqlStore = db.InitTestDB(t)
		ssoSettingsStore = ProvideStore(sqlStore)
	}

	t.Run("soft deletes the settings successfully", func(t *testing.T) {
		setup()

		providers := []string{"azuread", "github", "google"}
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
		}
		err := populateSSOSettings(sqlStore, template, providers...)
		require.NoError(t, err)

		err = ssoSettingsStore.Delete(context.Background(), providers[0])
		require.NoError(t, err)

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, 1, deleted)
		require.EqualValues(t, len(providers)-1, notDeleted)
	})

	t.Run("return not found if the provider doesn't exist in db", func(t *testing.T) {
		setup()

		providers := []string{"github", "google", "okta"}
		invalidProvider := "azuread"
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
		}
		err := populateSSOSettings(sqlStore, template, providers...)
		require.NoError(t, err)

		err = ssoSettingsStore.Delete(context.Background(), invalidProvider)
		require.Error(t, err)
		require.ErrorIs(t, err, ssosettings.ErrNotFound)

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, 0, deleted)
		require.EqualValues(t, len(providers), notDeleted)
	})

	t.Run("return not found if the provider sso settings are already deleted", func(t *testing.T) {
		setup()

		providers := []string{"azuread", "github", "google"}
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
			IsDeleted: true,
		}
		err := populateSSOSettings(sqlStore, template, providers...)
		require.NoError(t, err)

		err = ssoSettingsStore.Delete(context.Background(), providers[0])
		require.Error(t, err)
		require.ErrorIs(t, err, ssosettings.ErrNotFound)

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, len(providers), deleted)
		require.EqualValues(t, 0, notDeleted)
	})

	t.Run("delete one record if more valid sso settings are available for a provider", func(t *testing.T) {
		setup()

		provider := "azuread"
		template := models.SSOSettings{
			OAuthSettings: &social.OAuthInfo{
				Enabled: true,
			},
		}
		// insert sso for the same provider 2 times in the database
		err := populateSSOSettings(sqlStore, template, provider)
		require.NoError(t, err)
		err = populateSSOSettings(sqlStore, template, provider)
		require.NoError(t, err)

		err = ssoSettingsStore.Delete(context.Background(), provider)
		require.NoError(t, err)

		deleted, notDeleted, err := getSSOSettingsCountByDeleted(sqlStore)
		require.NoError(t, err)
		require.EqualValues(t, 1, deleted)
		require.EqualValues(t, 1, notDeleted)
	})
}

func populateSSOSettings(sqlStore *sqlstore.SQLStore, template models.SSOSettings, providers ...string) error {
	return sqlStore.WithDbSession(context.Background(), func(sess *db.Session) error {
		for _, provider := range providers {
			template.Provider = provider
			template.ID = uuid.New().String()
			template.Created = timeNow().UTC()

			dto, err := template.ToSSOSettingsDTO()
			if err != nil {
				return err
			}

			_, err = sess.Insert(dto)
			if err != nil {
				return err
			}
		}
		return nil
	})
}

func getSSOSettingsCountByDeleted(sqlStore *sqlstore.SQLStore) (deleted, notDeleted int64, err error) {
	err = sqlStore.WithDbSession(context.Background(), func(sess *db.Session) error {
		deleted, err = sess.Table("sso_setting").Where("is_deleted = ?", sqlStore.GetDialect().BooleanStr(true)).Count()
		if err != nil {
			return err
		}
		notDeleted, err = sess.Table("sso_setting").Where("is_deleted = ?", sqlStore.GetDialect().BooleanStr(false)).Count()
		return err
	})

	return
}

func getSSOSettingsByProvider(sqlStore *sqlstore.SQLStore, provider string, deleted bool) (*models.SSOSettings, error) {
	var model models.SSOSettingsDTO
	var err error

	err = sqlStore.WithDbSession(context.Background(), func(sess *db.Session) error {
		_, err = sess.Table("sso_setting").Where("provider = ? AND is_deleted = ?", provider, sqlStore.GetDialect().BooleanStr(deleted)).Get(&model)
		return err
	})

	if err != nil {
		return nil, err
	}

	settings, err := model.ToSSOSettings()
	if err != nil {
		return nil, err
	}

	return settings, err
}

func mockTimeNow(timeSeed time.Time) {
	timeNow = func() time.Time {
		return timeSeed
	}
}

func resetTimeNow() {
	timeNow = time.Now
}

func formatTime(timestamp time.Time) string {
	return timestamp.Format(time.RFC3339)
}