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// Software is furnished to do so, subject to the following conditions:
// 
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#nullable enable
using System.Collections.Generic;
using Duplicati.Library.Interface;

namespace Duplicati.Library.Utility.Options;

/// <summary>
/// Helper class for unified use of authentication settings
/// </summary>
public static class AuthOptionsHelper
{
    /// <summary>
    /// Gets the authentication options
    /// </summary>
    /// <param name="prefix">An optional prefix for the options</param>
    /// <returns>The authentication options</returns>
    public static CommandLineArgument[] GetOptions(string? prefix = null) =>
    [
        new CommandLineArgument($"{prefix}auth-username", CommandLineArgument.ArgumentType.String, Strings.AuthSettingsHelper.DescriptionAuthUsernameShort, Strings.AuthSettingsHelper.DescriptionAuthUsernameLong),
        new CommandLineArgument($"{prefix}auth-password", CommandLineArgument.ArgumentType.Password, Strings.AuthSettingsHelper.DescriptionAuthPasswordShort, Strings.AuthSettingsHelper.DescriptionAuthPasswordLong)
    ];

    /// <summary>
    /// Structure to hold the authentication options
    /// </summary>
    /// <param name="Username">The username</param>
    /// <param name="Password">The password</param>
    public sealed record AuthOptions(string? Username, string? Password)
    {
        /// <summary>
        /// Checks if the username has a value
        /// </summary>
        public bool HasUsername => !string.IsNullOrWhiteSpace(Username);
        /// <summary>
        /// Checks if the password has a value
        /// </summary>
        public bool HasPassword => !string.IsNullOrWhiteSpace(Password);

        /// <summary>
        /// Checks if the username and password are set
        /// </summary>
        /// <returns>True if the username and password are set</returns>
        public bool IsValid() => HasUsername && HasPassword;

        /// <summary>
        /// Throws an exception if the username and password are not set
        /// </summary>
        public void RequireCredentials()
        {
            if (!IsValid())
                throw new UserInformationException(Strings.AuthSettingsHelper.UsernameAndPasswordRequired, "UsernameAndPasswordRequired");
        }

        /// <summary>
        /// Parses the authentication options from a dictionary
        /// </summary>
        /// <param name="options">The dictionary to parse</param>
        /// <param name="prefix">An optional prefix for the options</param>
        /// <returns>The parsed authentication options</returns>
        public static AuthOptions Parse(IReadOnlyDictionary<string, string?> options, string? prefix = null)
            => new AuthOptions(
                options.GetValueOrDefault($"{prefix}auth-username"),
                options.GetValueOrDefault($"{prefix}auth-password")
            );
    }

}