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"
)

// getPodInfo
type getPodInfo struct {
	cli client.Client
}

type getPodInfoInputs struct {
	Namespace   string `mapstructure:"namespace" json:"namespace" validate:"required"`
	ClusterName string `mapstructure:"clusterName" json:"clusterName" validate:"required"`
	PodName     string `mapstructure:"podName" json:"podName" validate:"required"`
}

// nolint: unused
type getPodInfoOutputs struct {
	Zone          string                `mapstructure:"zone" `
	NodeName      string                `mapstructure:"nodeName"`
	ComponentType cloudv1.ComponentType `mapstructure:"componentType"`
}

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

func NewGetPodInfo(cli client.Client) action.Action {
	return &getPodInfo{cli: cli}
}

func (p *getPodInfo) Name() cloudv1.WorkflowActionName {
	return consts.WfActionGetPodInfoAction
}

func (p *getPodInfo) PreCheck(ctx context.Context, wf *cloudv1.Workflow, step cloudv1.WorkflowStep) error {
	inputs := &getPodInfoInputs{}
	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 *getPodInfo) Handle(ctx context.Context, wf *cloudv1.Workflow, step cloudv1.WorkflowStep) error {
	stepStatus, _ := wf.StepStatus(ctx, step.Name)

	inputs := &getPodInfoInputs{}
	_ = mapstructure.Decode(step.Inputs.Object, inputs)

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

	cli, err := clusteragent.NewClient(cluster)
	if err != nil {
		return fmt.Errorf("create cluster-agent client: %w", err)
	}
	pod, err := cli.GetPod(ctx, inputs.ClusterName, inputs.PodName)
	if err != nil {
		return fmt.Errorf("get pod(%s): %w", inputs.PodName, err)
	}
	node, err := cli.GetNode(ctx, inputs.ClusterName, pod.NodeName)
	if err != nil {
		return fmt.Errorf("get node(%s): %w", pod.NodeName, err)
	}

	outputs := map[string]string{
		"zone":          node.Zone,
		"nodeName":      pod.NodeName,
		"componentType": string(clusteragent.ConvertComponentTypeFromAPI(pod.ComponentType)),
	}
	return stepStatus.UpdateOutput(ctx, outputs)
}