package chapters

import (
	"time"

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

// Edit edits a chapter, and updates EditedDate. While many Edit functions cheat if there's nothing to
// change, this functill will due to EditedDate.
func Edit(chapter models.Chapter, title, source *string, fictionalDate *time.Time) (models.Chapter, error) {
	now := time.Now()
	changes := bson.M{"editedDate": now}

	edited := chapter
	edited.EditedDate = now

	if title != nil && *title != chapter.Title {
		changes["title"] = *title
		edited.Title = *title
	}
	if source != nil && *source != chapter.Source {
		changes["source"] = *source
		edited.Source = *source
	}
	if fictionalDate != nil && !fictionalDate.Equal(chapter.FictionalDate) {
		changes["fictionalDate"] = *fictionalDate
		edited.FictionalDate = *fictionalDate
	}

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

	return edited, nil
}