package dm

import (
	"fmt"
	"time"

	. "github.com/tidbcloud/dataflow-service-e2e/cases"
	"github.com/tidbcloud/dataflow-service-e2e/cases/premium/common"
	"github.com/tidbcloud/dataflow-service-e2e/internal/config"
	. "github.com/tidbcloud/dataflow-service-e2e/internal/model"
	dm_model "github.com/tidbcloud/dataflow-service-e2e/internal/tidbcloud/premium/consoleapi/dm/model"
)

// dmIncrementalMigrationSmokeCase tests incremental migration (binlog sync) for a premium DM migration.
// It covers:
// - Submit precheck and wait for completion
// - Create an INCREMENTAL-mode migration
// - Wait for migration to start running (binlog sync)
// - Verify migration stays in Running state (continuous sync)
// - Pause the migration
// - Resume the migration
// - Delete the migration
type dmIncrementalMigrationSmokeCase struct {
	BaseCase
	dmValidator   *common.PremiumDMValidator
	cloudProvider CloudProviderType
}

// NewDMIncrementalMigrationSmokeCase creates a new incremental migration smoke test case.
func NewDMIncrementalMigrationSmokeCase(cloudProvider CloudProviderType) E2ECase {
	return &dmIncrementalMigrationSmokeCase{cloudProvider: cloudProvider}
}

func (m *dmIncrementalMigrationSmokeCase) Name() string {
	return fmt.Sprintf("%sPremiumDMIncrementalMigrationSmoke", m.cloudProvider)
}

func (m *dmIncrementalMigrationSmokeCase) Tags() map[string]string {
	return map[string]string{TagKeyDomain: TagValueDomainDM}
}

func (m *dmIncrementalMigrationSmokeCase) DeclareDependencyRequirements() map[string]DependencyRequirement {
	return map[string]DependencyRequirement{
		"premium": &TiDBPremiumRequirement{
			Dedicated: false,
			TiDBPremiumDimensions: TiDBPremiumDimensions{
				CloudProvider: m.cloudProvider,
				Region:        config.GlobalConfig.DefaultRegionOf(m.cloudProvider),
			},
		},
		"mysql": &MySQLRequirement{
			MySQLDimensions: MySQLDimensions{
				NetworkType: DataflowNetworkTypeNetworkTypePublic,
			},
		},
	}
}

func (m *dmIncrementalMigrationSmokeCase) Run() {
	tidbCluster := m.TiDBPremium("premium")
	mysql := m.MySQL("mysql")
	m.dmValidator = common.NewPremiumDMValidator(m.Logger())

	var migrationID string
	var precheckID string

	// Cleanup: delete the created migration
	defer func() {
		if migrationID != "" {
			m.RetryDo(fmt.Sprintf("cleanup: delete premium migration %s", migrationID), func() error {
				return m.dmValidator.Client().DeleteMigration(tidbCluster, migrationID)
			}, DefaultRetryAttempts, DefaultRetryInterval)
		}
	}()

	m.
		// Step 1: Submit precheck
		Step("submit premium DM precheck", func() error {
			body := BuildPrecheckBody(
				GenerateMigrationName("pc"),
				dm_model.V1beta2PremiumDMTaskModeINCREMENTAL,
				dm_model.PremiumDMTaskImportModeENUMIMPORTMODELOGICAL,
				tidbCluster, mysql,
				DefaultDBForDMTest,
			)
			id, err := m.dmValidator.Client().CreatePrecheck(tidbCluster, body)
			if err != nil {
				return err
			}
			precheckID = id
			m.Logger().Info("precheck submitted: %s", precheckID)
			return nil
		}).

		// Step 2: Wait for precheck to complete
		Expect("precheck is done", func() error {
			return m.dmValidator.IsPrecheckDone(tidbCluster, precheckID)
		}, uint(PrecheckTimeout/(30*time.Second)), 30*time.Second).

		// Step 3: Create an INCREMENTAL-mode migration
		Step("create INCREMENTAL-mode premium DM migration", func() error {
			name := GenerateMigrationName("incr")
			body := BuildCreateMigrationBody(
				name,
				dm_model.V1beta2PremiumDMTaskModeINCREMENTAL,
				dm_model.PremiumDMTaskImportModeENUMIMPORTMODELOGICAL,
				tidbCluster, mysql,
				DefaultDBForDMTest,
			)
			resp, err := m.dmValidator.Client().CreateMigration(tidbCluster, body)
			if err != nil {
				return err
			}
			migrationID = resp.Payload.MigrationID
			m.Logger().Info("created incremental premium DM migration: %s", migrationID)
			return nil
		}).

		// Step 4: Wait for migration to start running
		Expect("premium DM migration is running", func() error {
			return m.dmValidator.IsMigrationRunning(tidbCluster, migrationID)
		}, DefaultExpectAttempts, DefaultExpectInterval).

		// Step 5: Verify migration stays running (incremental sync is continuous)
		Still("premium DM migration remains running", func() error {
			return m.dmValidator.IsMigrationRunning(tidbCluster, migrationID)
		}, 3, time.Minute).

		// Step 6: Pause the migration
		Step("pause premium DM migration", func() error {
			return m.dmValidator.Client().PauseMigration(tidbCluster, migrationID)
		}).

		// Step 7: Wait for migration to be paused
		Expect("premium DM migration is paused", func() error {
			return m.dmValidator.IsMigrationPaused(tidbCluster, migrationID)
		}, 20, DefaultExpectInterval).

		// Step 8: Resume the migration
		Step("resume premium DM migration", func() error {
			return m.dmValidator.Client().ResumeMigration(tidbCluster, migrationID)
		}).

		// Step 9: Wait for migration to be running again
		Expect("premium DM migration is running again", func() error {
			return m.dmValidator.IsMigrationRunning(tidbCluster, migrationID)
		}, DefaultExpectAttempts, DefaultExpectInterval).

		// Step 10: Delete the migration
		RetryDo("delete premium DM migration", func() error {
			return m.dmValidator.Client().DeleteMigration(tidbCluster, migrationID)
		}, DefaultRetryAttempts, DefaultRetryInterval).

		// Step 11: Verify migration is deleted
		Expect("premium DM migration is deleted", func() error {
			return m.dmValidator.IsMigrationDeleted(tidbCluster, migrationID)
		}, 10, 30*time.Second)

	migrationID = ""
}