package common

import (
	"github.com/mainnika/mongox-go-driver/mongox"
	"github.com/mainnika/mongox-go-driver/mongox/errors"
	"github.com/mainnika/mongox-go-driver/mongox/query"
	"github.com/mongodb/mongo-go-driver/mongo"
	"github.com/mongodb/mongo-go-driver/mongo/options"
)

// Count function counts documents in the database by query
// target is used only to get collection by tag so it'd be better to use nil ptr here
func Count(db *mongox.Database, target interface{}, filters ...interface{}) (int64, error) {

	collection := db.GetCollectionOf(target)
	opts := options.Count()
	composed := query.Compose(filters...)

	opts.Limit = composed.Limiter()
	opts.Skip = composed.Skipper()

	result, err := collection.Count(db.Context(), composed.M(), opts)
	if err == mongo.ErrNoDocuments {
		return 0, errors.NotFoundErrorf("%s", err)
	}
	if err != nil {
		return 0, errors.InternalErrorf("can't decode desult: %s", err)
	}

	return result, nil
}