package copyright

import (
	"context"
	"errors"
	"tercul/internal/domain"
)

// CopyrightCommands contains the command handlers for copyright.
type CopyrightCommands struct {
	repo domain.CopyrightRepository
}

// NewCopyrightCommands creates a new CopyrightCommands handler.
func NewCopyrightCommands(repo domain.CopyrightRepository) *CopyrightCommands {
	return &CopyrightCommands{repo: repo}
}

// CreateCopyright creates a new copyright.
func (c *CopyrightCommands) CreateCopyright(ctx context.Context, copyright *domain.Copyright) error {
	if copyright == nil {
		return errors.New("copyright cannot be nil")
	}
	if copyright.Name == "" {
		return errors.New("copyright name cannot be empty")
	}
	if copyright.Identificator == "" {
		return errors.New("copyright identificator cannot be empty")
	}
	return c.repo.Create(ctx, copyright)
}

// UpdateCopyright updates an existing copyright.
func (c *CopyrightCommands) UpdateCopyright(ctx context.Context, copyright *domain.Copyright) error {
	if copyright == nil {
		return errors.New("copyright cannot be nil")
	}
	if copyright.ID == 0 {
		return errors.New("copyright ID cannot be zero")
	}
	if copyright.Name == "" {
		return errors.New("copyright name cannot be empty")
	}
	if copyright.Identificator == "" {
		return errors.New("copyright identificator cannot be empty")
	}
	return c.repo.Update(ctx, copyright)
}

// DeleteCopyright deletes a copyright.
func (c *CopyrightCommands) DeleteCopyright(ctx context.Context, id uint) error {
	if id == 0 {
		return errors.New("invalid copyright ID")
	}
	return c.repo.Delete(ctx, id)
}

// AttachCopyrightToEntity attaches a copyright to any entity type.
func (c *CopyrightCommands) AttachCopyrightToEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error {
	if copyrightID == 0 || entityID == 0 {
		return errors.New("invalid copyright ID or entity ID")
	}
	if entityType == "" {
		return errors.New("entity type cannot be empty")
	}
	return c.repo.AttachToEntity(ctx, copyrightID, entityID, entityType)
}

// DetachCopyrightFromEntity removes a copyright from an entity.
func (c *CopyrightCommands) DetachCopyrightFromEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error {
	if copyrightID == 0 || entityID == 0 {
		return errors.New("invalid copyright ID or entity ID")
	}
	if entityType == "" {
		return errors.New("entity type cannot be empty")
	}
	return c.repo.DetachFromEntity(ctx, copyrightID, entityID, entityType)
}

// AddTranslation adds a translation to a copyright.
func (c *CopyrightCommands) AddTranslation(ctx context.Context, translation *domain.CopyrightTranslation) error {
	if translation == nil {
		return errors.New("translation cannot be nil")
	}
	if translation.CopyrightID == 0 {
		return errors.New("copyright ID cannot be zero")
	}
	if translation.LanguageCode == "" {
		return errors.New("language code cannot be empty")
	}
	if translation.Message == "" {
		return errors.New("translation message cannot be empty")
	}
	return c.repo.AddTranslation(ctx, translation)
}