package dm

import (
	"fmt"

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

// dmScaleSmokeCase tests scaling a DM job to a different spec.
// It creates a DM job, waits for it to be running, scales it, and verifies the result.
type dmScaleSmokeCase struct {
	BaseCase
	dmValidator   *common.DMValidator
	cloudProvider CloudProviderType
}

// NewDMScaleSmokeCase creates a new scale smoke test case.
func NewDMScaleSmokeCase(cloudProvider CloudProviderType) E2ECase {
	return &dmScaleSmokeCase{cloudProvider: cloudProvider}
}

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

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

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

func (m *dmScaleSmokeCase) Run() {
	tidbCluster := m.TiDBDedicated("tidb")
	mysql := m.MySQL("mysql")
	m.dmValidator = common.NewDMValidator(m.Logger())

	var jobID string
	var initialSpecID string
	var targetSpecID string
	var connProfileID string
	var precheckID string

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

	m.
		// Step 1: Get two different specs for scale testing
		Step("get DM job specs for scale test", func() error {
			spec1, err := m.dmValidator.GetFirstJobSpec()
			if err != nil {
				return err
			}
			initialSpecID = spec1.ID

			spec2, err := m.dmValidator.GetSecondJobSpec()
			if err != nil {
				return err
			}
			targetSpecID = spec2.ID

			m.Logger().Info("scale test: initial spec=%s, target spec=%s", initialSpecID, targetSpecID)
			return nil
		}).

		// Step 2: Register connection profile for the MySQL source
		Step("create conn profile", func() error {
			id, err := consoleapi.NewConnProfileClientWrapper(m.Logger()).CreateConnProfile(
				tidbCluster, mysql, GenerateDMJobName("cp"),
			)
			if err != nil {
				return err
			}
			connProfileID = id
			return nil
		}).

		// Step 3: Submit precheck
		Step("submit DM precheck", func() error {
			body := BuildPrecheckBody(
				GenerateDMJobName("pc"), DMModeIncremental, DMImportModeLogical, initialSpecID,
				tidbCluster, mysql, false,
			)
			id, err := m.dmValidator.Client().PrecheckJob(tidbCluster, body)
			if err != nil {
				return err
			}
			precheckID = id
			m.Logger().Info("precheck submitted: %s", precheckID)
			return nil
		}).

		// Step 4: Wait for precheck to complete
		Expect("precheck is done", func() error {
			return m.dmValidator.IsPrecheckDone(tidbCluster, precheckID)
		}, uint(PrecheckTimeout/DefaultExpectInterval), DefaultExpectInterval).

		// Step 5: Create an incremental-mode DM job (incremental stays running for scale testing)
		Step("create DM job for scale test", func() error {
			jobName := GenerateDMJobName("scale")
			body := BuildCreateJobBody(
				jobName, DMModeIncremental, DMImportModeLogical, initialSpecID,
				tidbCluster, connProfileID, precheckID, false, []string{DefaultDBForDMTest},
			)
			resp, err := m.dmValidator.Client().CreateJob(tidbCluster, body)
			if err != nil {
				return err
			}
			jobID = resp.Payload.ID
			m.Logger().Info("created DM job for scale test: %s", jobID)
			return nil
		}).

		// Step 6: Wait for job to be running
		Expect("DM job is running", func() error {
			return m.dmValidator.IsJobRunning(tidbCluster, jobID)
		}, DefaultExpectAttempts, DefaultExpectInterval).

		// Step 7: Scale the job to target spec
		Step("scale DM job", func() error {
			m.Logger().Info("scaling job %s from spec %s to spec %s", jobID, initialSpecID, targetSpecID)
			return m.dmValidator.Client().ScaleJob(tidbCluster, jobID, targetSpecID)
		}).

		// Step 8: Wait for scaling to complete (job should go to Scaling then back to Running)
		Expect("DM job is running after scale", func() error {
			return m.dmValidator.IsJobRunning(tidbCluster, jobID)
		}, uint(ScaleTimeout/DefaultExpectInterval), DefaultExpectInterval).

		// Step 9: Verify the spec has changed
		Step("verify DM job spec changed", func() error {
			job, err := m.dmValidator.Client().GetJob(tidbCluster, jobID)
			if err != nil {
				return err
			}
			if job.Spec == nil || job.Spec.ID != targetSpecID {
				actualSpecID := ""
				if job.Spec != nil {
					actualSpecID = job.Spec.ID
				}
				return fmt.Errorf("job spec is %s, expected %s", actualSpecID, targetSpecID)
			}
			m.Logger().Info("job spec successfully changed to %s (%s)", job.Spec.ID, job.Spec.DisplayName)
			return nil
		}).

		// Step 10: Delete the job
		RetryDo("delete DM job", func() error {
			return m.dmValidator.Client().DeleteJob(tidbCluster, jobID)
		}, DefaultRetryAttempts, DefaultRetryInterval).

		// Step 11: Verify deletion
		Expect("DM job is deleted", func() error {
			return m.dmValidator.IsJobDeleted(tidbCluster, jobID)
		}, 10, DefaultExpectInterval)

	jobID = ""
}