package subscribers

import (
	"context"
	"encoding/json"

	"backend/app/events"
	"backend/app/events/publishers"
	"backend/app/http/users"
	"backend/database/fields"

	"git.ipao.vip/rogeecn/atom/contracts"
	"github.com/ThreeDotsLabs/watermill/message"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

var _ contracts.EventHandler = (*UserRegister)(nil)

// @provider(event)
type UserRegister struct {
	log *logrus.Entry `inject:"false"`

	userSvc *users.Service
}

func (e *UserRegister) Prepare() error {
	e.log = logrus.WithField("module", "events.subscribers.user_register")
	return nil
}

// PublishToTopic implements contracts.EventHandler.
func (e *UserRegister) PublishToTopic() string {
	return events.TopicProcessed
}

// Topic implements contracts.EventHandler.
func (e *UserRegister) Topic() string {
	return events.TopicUserRegister
}

// Handler implements contracts.EventHandler.
func (e *UserRegister) Handler(msg *message.Message) ([]*message.Message, error) {
	var payload publishers.UserRegister
	err := json.Unmarshal(msg.Payload, &payload)
	if err != nil {
		return nil, err
	}
	e.log.Infof("received event %s", msg.Payload)

	user, err := e.userSvc.GetUserByID(context.Background(), payload.ID)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to get user by id: %d", payload.ID)
	}

	if user.Status != fields.UserStatusPending {
		return nil, nil
	}

	err = e.userSvc.SetUserStatusByID(context.Background(), payload.ID, fields.UserStatusVerified)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to set user status to %s by id: %d", fields.UserStatusVerified, payload.ID)
	}

	return nil, nil
}