package dataplane

import (
	"context"
	"fmt"

	"github.com/mitchellh/mapstructure"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	"sigs.k8s.io/controller-runtime/pkg/client"

	clusteragent "github.com/tidbcloud/eks-provider/controllers/utils/cluster_agent"
	"github.com/tidbcloud/eks-provider/controllers/workflow/action"
	cloudv1 "github.com/tidbcloud/infra-api/api/v1"
	"github.com/tidbcloud/infra-provider/pkg/consts"
)

// deleteTCMember deletes a tc member by adding 'delete-slot' annotation to TC's annotations
type deleteTCMember struct {
	cli client.Client
}

type deleteTCMemberInputs struct {
	Namespace   string `mapstructure:"namespace" json:"namespace" validate:"required"`
	ClusterName string `mapstructure:"clusterName" json:"clusterName" validate:"required"`
	// MemberName is also the name of the corresponding pod, for example 'db-tidb-0'
	MemberName string `mapstructure:"memberName" json:"memberName" validate:"required"`
}

// nolint: unused
type deleteTCMemberOutputs struct {
	// NewMemberName is the name of being recreated member after deleting
	NewMemberName string `mapstructure:"newMemberName" validate:"required"`
}

var (
	_ action.Action = &deleteTCMember{}
)

func NewDeleteTCMember(cli client.Client) action.Action {
	return &deleteTCMember{cli: cli}
}

func (p *deleteTCMember) Name() cloudv1.WorkflowActionName {
	return consts.WfActionDeleteTCMemberAction
}

func (p *deleteTCMember) PreCheck(ctx context.Context, wf *cloudv1.Workflow, step cloudv1.WorkflowStep) error {
	inputs := &deleteTCMemberInputs{}
	if err := mapstructure.Decode(step.Inputs.Object, inputs); err != nil {
		return fmt.Errorf("decode inputs: %w", err)
	}
	if err := validate.Struct(inputs); err != nil {
		return fmt.Errorf("validate inputs: %w", err)
	}
	return nil
}

func (p *deleteTCMember) Handle(ctx context.Context, wf *cloudv1.Workflow, step cloudv1.WorkflowStep) error {
	inputs := &deleteTCMemberInputs{}
	_ = mapstructure.Decode(step.Inputs.Object, inputs)
	stepStatus, _ := wf.StepStatus(ctx, step.Name)

	cluster := &cloudv1.Cluster{}
	if err := p.cli.Get(ctx, client.ObjectKey{Namespace: inputs.Namespace, Name: inputs.ClusterName}, cluster); err != nil {
		if apierrors.IsNotFound(err) {
			return cloudv1.NewWFNonRetriableError(fmt.Errorf("cluster %s not found", inputs.ClusterName))
		}
		return fmt.Errorf("get cluster: %w", err)
	}
	cli, err := clusteragent.NewClient(cluster)
	if err != nil {
		return fmt.Errorf("create cluster-agent client: %w", err)
	}

	resp, err := cli.DeleteTCMember(ctx, inputs.ClusterName, inputs.MemberName)
	if err != nil {
		return fmt.Errorf("delete tc member: %w", err)
	}

	return stepStatus.UpdateOutput(ctx, map[string]string{
		"newMemberName": resp.NewMemberName,
	})
}