package subscribers

import (
	"context"
	"encoding/json"

	"backend/app/events"
	"backend/app/events/publishers"
	"backend/app/http/posts"
	"backend/app/jobs"
	"backend/database/fields"
	"backend/providers/job"

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

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

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

	postSvc *posts.Service
	job     *job.Job
}

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

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

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

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

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

	video, ok := lo.Find(post.Assets.Data, func(asset fields.MediaAsset) bool {
		return asset.Type == fields.MediaAssetTypeVideo
	})

	if !ok {
		e.log.Warnf("post %d %s has no video asset", post.ID, post.Title)
		return nil, nil
	}

	job, err := e.job.Client()
	if err != nil {
		return nil, err
	}

	// cut video
	_, err = job.Insert(context.Background(), jobs.PostVideoCutJob{
		PostID:   post.ID,
		Hash:     video.Hash,
		TenantID: post.TenantID,
		UserID:   post.UserID,
	}, nil)
	if err != nil {
		return nil, err
	}

	// extract audio
	_, err = job.Insert(context.Background(), jobs.PostVideoExtractAudioJob{
		PostID:   post.ID,
		Hash:     video.Hash,
		TenantID: post.TenantID,
		UserID:   post.UserID,
	}, nil)
	if err != nil {
		return nil, err
	}

	return nil, nil
}