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 *
 * OPC Foundation MIT License 1.00
 *
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 * obtaining a copy of this software and associated documentation
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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua.Identity;
using Opc.Ua.Server;
using Quickstarts.ReferenceServer;

namespace Opc.Ua.Client.TestFramework
{
    public sealed class TokenValidatorMock : ITokenValidator, IDisposable
    {
        public const string DefaultIssuer = "urn:opcfoundation:tests:jwt";
        public const string DefaultSubject = "local-issued-token-user";

        public IssuedIdentityTokenHandler LastIssuedToken { get; set; } = null!;

        public string? Issuer { get; set; } = DefaultIssuer;

        public string? Subject { get; set; } = DefaultSubject;

        public void Dispose()
        {
            LastIssuedToken = null!;
        }

        public IUserIdentity ValidateToken(IssuedIdentityTokenHandler issuedToken)
        {
            LastIssuedToken = issuedToken.Copy();

            var claims = new Dictionary<string, object?>();
            if (Issuer != null)
            {
                claims["iss"] = Issuer;
            }
            if (Subject != null)
            {
                claims["sub"] = Subject;
            }

            return new JwtUserIdentity(
                issuedToken,
                claims,
                [],
                [],
                Issuer,
                Subject);
        }
    }

    /// <summary>
    /// Adapts the legacy quickstart token validator to the P5 identity-registry surface.
    /// </summary>
    public sealed class MockJwtAuthenticator : IUserTokenAuthenticator
    {
        private readonly ITokenValidator m_validator;

        public MockJwtAuthenticator(ITokenValidator validator)
        {
            m_validator = validator ?? throw new ArgumentNullException(nameof(validator));
        }

        public UserTokenType TokenType => UserTokenType.IssuedToken;

        public string? IssuedTokenProfileUri => Profiles.JwtUserToken;

        public async ValueTask<AuthenticationResult> AuthenticateAsync(
            AuthenticationContext context,
            CancellationToken ct = default)
        {
            ct.ThrowIfCancellationRequested();
            if (context.TokenHandler is not IssuedIdentityTokenHandler issuedToken ||
                issuedToken.IssuedTokenType != IssuedTokenType.JWT)
            {
                return AuthenticationResult.NotHandled;
            }

            return await new ValueTask<AuthenticationResult>(AuthenticateJwt(issuedToken))
                .ConfigureAwait(false);
        }

        private AuthenticationResult AuthenticateJwt(IssuedIdentityTokenHandler issuedToken)
        {
            try
            {
                return AuthenticationResult.Accept(m_validator.ValidateToken(issuedToken));
            }
            catch (ServiceResultException ex)
            {
                return AuthenticationResult.Reject(ex.Result);
            }
        }
    }
}