package webfilesystem

import (
	"errors"

	"go.mongodb.org/mongo-driver/bson/primitive"
)

//TODO Transparently split to single data and header reading methods
func (fs *WebFileSystem) readFSDocs(fileID primitive.ObjectID, fileData interface{}) (*FileHeader, error) {
	fileHeader := &FileHeader{}
	filter := primitive.M{
		"_id": fileID,
	}
	err := fs.webfsFilesTable.FindOne(fs.ctx, filter).Decode(fileHeader)
	if err != nil {
		return nil, err
	}
	if fileData != nil {
		filter := primitive.M{
			"_id": fileHeader.Data,
		}
		err := fs.webfsFilesData.FindOne(fs.ctx, filter).Decode(fileData)
		if err != nil {
			return nil, err
		}
	}
	return fileHeader, nil
}

func (fs *WebFileSystem) writeFileToMongo(file *FileHeader, data interface{}) (primitive.ObjectID, primitive.ObjectID, error) {
	resData, err := fs.webfsFilesData.InsertOne(fs.ctx, data)
	if err != nil {
		return primitive.NilObjectID, primitive.NilObjectID, err
	}
	file.Data = resData.InsertedID.(primitive.ObjectID)
	resHeader, err := fs.webfsFilesTable.InsertOne(fs.ctx, file)
	if err != nil {
		return primitive.NilObjectID, primitive.NilObjectID, err
	}
	return resHeader.InsertedID.(primitive.ObjectID), resData.InsertedID.(primitive.ObjectID), err
}

func (fs *WebFileSystem) removeFromMongo(fileId primitive.ObjectID) error {
	fileHeader, err := fs.readFSDocs(fileId, nil)
	if err != nil {
		return err
	}

	filterHeader := primitive.M{
		"_id": fileHeader.MongoId,
	}
	res, err := fs.webfsFilesTable.DeleteOne(fs.ctx, filterHeader)
	if err != nil {
		return err
	}
	if res.DeletedCount < 1 {
		return errors.New("no file header deleted")
	}

	filterData := primitive.M{
		"_id": fileHeader.Data,
	}
	res, err = fs.webfsFilesData.DeleteOne(fs.ctx, filterData)
	if err != nil {
		return err
	}
	if res.DeletedCount < 1 {
		return errors.New("no file data deleted")
	}
	return nil
}

//Deprecated
func (fs *WebFileSystem) Validate() error {
	// filter := primitive.D{
	// 	{
	// 		Key:   "type",
	// 		Value: "directory",
	// 	},
	// }
	// cur, err := fs.webfsCollection.Find(context.Background(), filter)
	// if err != nil {
	// 	return err
	// }
	// defer cur.Close(context.Background())

	// directories := []*WebFSFile{}

	// for cur.Next(context.Background()) {
	// 	dir := &WebFSFile{}

	// 	err = cur.Decode(dir)
	// 	if err != nil {
	// 		println(err.Error())
	// 		return err
	// 	}
	// 	directories = append(directories, dir)
	// }

	// for _, d := range directories {
	// 	fs.validateDir(d)
	// }
	return nil
}