package graphql

import (
	"errors"
	"fmt"
	"strings"
	"tercul/internal/adapters/graphql/model"

	"github.com/asaskevich/govalidator"
)

var ErrValidation = errors.New("validation failed")

func validateWorkInput(input model.WorkInput) error {
	name := strings.TrimSpace(input.Name)
	if len(name) < 3 {
		return fmt.Errorf("name must be at least 3 characters long")
	}
	if !govalidator.Matches(name, `^[a-zA-Z0-9\s]+$`) {
		return fmt.Errorf("name can only contain letters, numbers, and spaces")
	}
	if len(input.Language) != 2 {
		return fmt.Errorf("language must be a 2-character code")
	}
	return nil
}

func validateAuthorInput(input model.AuthorInput) error {
	name := strings.TrimSpace(input.Name)
	if len(name) < 3 {
		return fmt.Errorf("name must be at least 3 characters long")
	}
	if !govalidator.Matches(name, `^[a-zA-Z0-9\s]+$`) {
		return fmt.Errorf("name can only contain letters, numbers, and spaces")
	}
	if len(input.Language) != 2 {
		return fmt.Errorf("language must be a 2-character code")
	}
	return nil
}

func validateTranslationInput(input model.TranslationInput) error {
	name := strings.TrimSpace(input.Name)
	if len(name) < 3 {
		return fmt.Errorf("name must be at least 3 characters long")
	}
	if !govalidator.Matches(name, `^[a-zA-Z0-9\s]+$`) {
		return fmt.Errorf("name can only contain letters, numbers, and spaces")
	}
	if len(input.Language) != 2 {
		return fmt.Errorf("language must be a 2-character code")
	}
	if input.WorkID == "" {
		return fmt.Errorf("workId is required")
	}
	return nil
}