package dm

import (
	"fmt"
	"time"

	. "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"
)

// dmPrecheckSmokeCase tests DM precheck functionality.
// It creates a precheck request, polls until done, then verifies precheck results.
type dmPrecheckSmokeCase struct {
	BaseCase
	dmValidator   *common.DMValidator
	cloudProvider CloudProviderType
}

// NewDMPrecheckSmokeCase creates a new precheck smoke test case.
func NewDMPrecheckSmokeCase(cloudProvider CloudProviderType) E2ECase {
	return &dmPrecheckSmokeCase{cloudProvider: cloudProvider}
}

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

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

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

	var precheckID string
	var specID string

	// Cleanup: cancel precheck if still running
	defer func() {
		if precheckID != "" {
			m.RetryDo(fmt.Sprintf("cleanup: cancel precheck %s", precheckID), func() error {
				return m.dmValidator.Client().CancelPrecheck(tidbCluster, precheckID)
			}, DefaultRetryAttempts, DefaultRetryInterval)
		}
	}()

	m.
		// Step 1: Get available DM job spec
		Step("get DM job spec for precheck", func() error {
			spec, err := m.dmValidator.GetFirstJobSpec()
			if err != nil {
				return err
			}
			specID = spec.ID
			m.Logger().Info("using spec for precheck: %s (%s)", spec.ID, spec.DisplayName)
			return nil
		}).

		// Step 2: Submit a precheck request
		Step("submit DM precheck", func() error {
			body := BuildPrecheckBody(
				GenerateDMJobName("precheck"), DMModeFull, DMImportModeLogical, specID,
				tidbCluster, mysql, true,
			)
			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 3: 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 4: Verify precheck result contains items
		Step("verify precheck result", func() error {
			resp, err := m.dmValidator.Client().GetPrecheck(tidbCluster, precheckID)
			if err != nil {
				return err
			}
			if len(resp.Items) == 0 {
				return fmt.Errorf("precheck returned no items")
			}
			m.Logger().Info("precheck returned %d items, status=%s", len(resp.Items), resp.Status)
			return nil
		})

	precheckID = ""
}