package mongodb

import (
	"context"
	"errors"
	"git.aiterp.net/rpdata/api/internal/generate"
	"git.aiterp.net/rpdata/api/models"
	"git.aiterp.net/rpdata/api/repositories"
	"github.com/globalsign/mgo"
	"github.com/globalsign/mgo/bson"
	"log"
	"strings"
)

type commentRepository struct {
	restoreIDs bool
	comments   *mgo.Collection
}

func newCommentRepository(db *mgo.Database, restoreIDs bool) (repositories.CommentRepository, error) {
	collection := db.C("story.comments")

	err := collection.EnsureIndexKey("chapterId")
	if err != nil {
		return nil, err
	}
	err = collection.EnsureIndexKey("author")
	if err != nil {
		return nil, err
	}
	err = collection.EnsureIndexKey("createdDate")
	if err != nil {
		return nil, err
	}

	r := &commentRepository{
		restoreIDs: restoreIDs,
		comments:   collection,
	}

	go r.fixFieldTypo()

	return r, nil
}

func (r *commentRepository) Find(ctx context.Context, id string) (*models.Comment, error) {
	comment := new(models.Comment)
	err := r.comments.FindId(id).One(comment)
	if err != nil {
		return nil, err
	}

	return comment, nil
}

func (r *commentRepository) List(ctx context.Context, filter models.CommentFilter) ([]*models.Comment, error) {
	query := bson.M{}
	if filter.ChapterID != nil {
		query["chapterId"] = *filter.ChapterID
	}

	comments := make([]*models.Comment, 0, 32)
	err := r.comments.Find(query).Sort("createdDate").Limit(filter.Limit).All(&comments)
	if err != nil {
		if err == mgo.ErrNotFound {
			return comments, nil
		}

		return nil, err
	}

	return comments, nil
}

func (r *commentRepository) Insert(ctx context.Context, comment models.Comment) (*models.Comment, error) {
	if !r.restoreIDs {
		comment.ID = generate.CommentID()
	} else {
		if len(comment.ID) != len(generate.CommentID()) && strings.HasPrefix(comment.ID, "SSC") {
			return nil, errors.New("invalid story id")
		}
	}

	err := r.comments.Insert(comment)
	if err != nil {
		return nil, err
	}

	return &comment, nil
}

func (r *commentRepository) Update(ctx context.Context, comment models.Comment, update models.CommentUpdate) (*models.Comment, error) {
	updateBson := bson.M{}
	if update.Subject != nil {
		updateBson["subject"] = *update.Subject
		comment.Subject = *update.Subject
	}
	if update.Source != nil {
		updateBson["source"] = *update.Source
		comment.Source = *update.Source
	}
	if update.FictionalDate != nil {
		updateBson["fictionalDate"] = *update.FictionalDate
		comment.FictionalDate = *update.FictionalDate
	}
	if update.CharacterID != nil {
		updateBson["characterId"] = *update.CharacterID
		comment.CharacterID = *update.CharacterID
	}
	if update.CharacterName != nil {
		updateBson["characterName"] = *update.CharacterName
		comment.CharacterName = *update.CharacterName
	}

	err := r.comments.UpdateId(comment.ID, bson.M{"$set": updateBson})
	if err != nil {
		return nil, err
	}

	return &comment, nil
}

func (r *commentRepository) Delete(ctx context.Context, comment models.Comment) error {
	return r.comments.RemoveId(comment.ID)
}

func (r *commentRepository) fixFieldTypo() {
	c, err := r.comments.UpdateAll(bson.M{
		"editeddDate": bson.M{"$ne": nil},
	}, bson.M{
		"$rename": bson.M{"editeddDate": "editedDate"},
	})
	if err != nil {
		if err == mgo.ErrNotFound {
			return
		}

		log.Println("Failed to run name typo fix:", err)
		return
	}
	if c.Updated > 0 {
		log.Println("Fixed editeddDate field name typo in", c.Updated, "comments")
	}
}