namespace FruitBank.Common.Services;

/// <summary>
/// Service for securely storing and retrieving user credentials.
/// Platform-specific implementations handle the actual secure storage.
/// </summary>
public interface ISecureCredentialService
{
    /// <summary>
    /// Saves the user credentials securely with a 2-day expiration from now.
    /// </summary>
    Task SaveCredentialsAsync(string email, string password);

    /// <summary>
    /// Retrieves the stored credentials if they exist and haven't expired.
    /// Returns null if no credentials are stored or if they have expired.
    /// </summary>
    Task<StoredCredentials?> GetCredentialsAsync();

    /// <summary>
    /// Clears all stored credentials (used on logout).
    /// </summary>
    Task ClearCredentialsAsync();
}

/// <summary>
/// Represents stored user credentials.
/// </summary>
public sealed record StoredCredentials(string Email, string Password);