// Package port defines interfaces (ports) for external dependencies.
// These interfaces define the contracts between the application core and
// infrastructure adapters, enabling testability and flexibility.
package port

import (
	"context"

	"git.threesix.ai/jordan/slack5-1770603014/services/preferences-api/internal/domain"
)

// PreferencesRepository defines the interface for preferences persistence operations.
// Implementations may use databases, in-memory storage, or external services.
type PreferencesRepository interface {
	// Get returns preferences for a user by ID.
	// Returns nil, nil if no preferences exist for the user.
	Get(ctx context.Context, userID domain.UserID) (*domain.UserPreferences, error)

	// Upsert creates or updates preferences for a user.
	Upsert(ctx context.Context, prefs *domain.UserPreferences) error
}
