package posts

import (
	"crypto/rand"
	"encoding/binary"
	"errors"
	"strconv"
	"time"

	"git.aiterp.net/rpdata/api/internal/counter"
	"git.aiterp.net/rpdata/api/models"
)

// Add creates a new post.
func Add(log models.Log, time time.Time, kind, nick, text string) (models.Post, error) {
	if kind == "" || nick == "" || text == "" {
		return models.Post{}, errors.New("Missing/empty parameters")
	}

	mutex.RLock()
	defer mutex.RUnlock()

	position, err := counter.Next("next_post_id", log.ShortID)
	if err != nil {
		return models.Post{}, err
	}

	post := models.Post{
		ID:       generateID(time),
		Position: position,
		LogID:    log.ShortID,
		Time:     time,
		Kind:     kind,
		Nick:     nick,
		Text:     text,
	}

	err = collection.Insert(post)
	if err != nil {
		return models.Post{}, err
	}

	return post, nil
}

func generateID(time time.Time) string {
	data := make([]byte, 4)
	rand.Read(data)

	return "P" + strconv.FormatInt(time.UnixNano(), 36) + strconv.FormatInt(int64(binary.LittleEndian.Uint32(data)), 36)
}