package posts

import (
	"time"

	"git.aiterp.net/rpdata/api/models"
	"github.com/globalsign/mgo/bson"
)

// Edit edits a post and returns the result if the edit succeeded.
func Edit(post models.Post, time *time.Time, kind *string, nick *string, text *string) (models.Post, error) {
	mutex.RLock()
	defer mutex.RUnlock()

	changes := bson.M{}

	if time != nil && !time.IsZero() && !time.Equal(post.Time) {
		changes["time"] = *time
		post.Time = *time
	}
	if kind != nil && *kind != "" && *kind != post.Kind {
		changes["kind"] = *kind
		post.Kind = *kind
	}
	if nick != nil && *nick != "" && *nick != post.Nick {
		changes["nick"] = *nick
		post.Nick = *nick
	}
	if text != nil && *text != "" && *text != post.Text {
		changes["text"] = *text
		post.Text = *text
	}

	if len(changes) == 0 {
		return post, nil
	}

	err := collection.UpdateId(post.ID, bson.M{"$set": changes})
	if err != nil {
		return models.Post{}, err
	}

	return post, nil
}