package mgocrud

import (
	validator "gopkg.in/go-playground/validator.v8"
	mgo "gopkg.in/mgo.v2"
	"gopkg.in/mgo.v2/bson"
)

// ValidateObject validates object via validator tag and custom method
func ValidateObject(db *mgo.Database, m ModelInterface, changes bson.M) error {
	// first validate via struct tag
	validator := validator.New(&validator.Config{
		TagName: "validator",
	})
	err := validator.Struct(m)
	if err != nil {
		return err
	}

	// next execute custom model validator if exists
	if i, ok := m.(interface {
		Validate(db *mgo.Database, changes bson.M) error
	}); ok {
		return i.Validate(db, changes)
	}

	return nil
}