package repository

import (
	"encoding/json"
	"fmt"
	"strconv"
	"time"

	"gitrepo.ru/neonxp/gorum/models"
	"go.etcd.io/bbolt"
)

type Post struct {
	db *bbolt.DB
}

func NewPost(db *bbolt.DB) *Post {
	return &Post{
		db: db,
	}
}

func (t *Post) CreatePost(
	text string,
	authorID string,
	topicID uint64,
) (uint64, error) {
	post := &models.Post{
		Text:      text,
		AuthorID:  authorID,
		CreatedAt: time.Now(),
		UpdatedAt: time.Now(),
	}

	return post.ID, t.db.Update(func(tx *bbolt.Tx) error {
		bucket, err := tx.CreateBucketIfNotExists([]byte(fmt.Sprintf("posts_%d", topicID)))
		if err != nil {
			return err
		}
		id, err := bucket.NextSequence()
		if err != nil {
			return err
		}
		post.ID = id
		pb, err := json.Marshal(post)
		if err != nil {
			return err
		}

		return bucket.Put([]byte(strconv.Itoa(int(id))), pb)
	})
}

func (t *Post) List(topicID uint64) ([]*models.Post, error) {
	posts := make([]*models.Post, 0)

	return posts, t.db.View(func(tx *bbolt.Tx) error {
		return tx.Bucket([]byte(fmt.Sprintf("posts_%d", topicID))).ForEach(func(k, v []byte) error {
			post := new(models.Post)

			if err := json.Unmarshal(v, post); err != nil {
				return err
			}

			posts = append(posts, post)

			return nil
		})
	})
}