using Thalos.Bff.Application.Adapters;
using Thalos.Bff.Application.Handlers;
using Thalos.Bff.Application.Security;
using Thalos.Bff.Contracts.Api;
using BuildingBlock.Identity.Contracts.Requests;
using BuildingBlock.Identity.Contracts.Responses;

namespace Thalos.Bff.Application.UnitTests;

public class IssueTokenHandlerTests
{
    [Fact]
    public async Task HandleAsync_WhenPermissionAllowed_DelegatesToServiceClient()
    {
        var handler = new IssueTokenHandler(
            new FakeThalosServiceClient(),
            new FakeIdentityEdgeContractAdapter(),
            new AllowPermissionGuard());

        var response = await handler.HandleAsync(new IssueTokenApiRequest("user-1", "tenant-1", "corr-123"));

        Assert.Equal("token-xyz", response.AccessToken);
        Assert.Equal(1800, response.ExpiresInSeconds);
    }

    private sealed class FakeThalosServiceClient : IThalosServiceClient
    {
        public Task<IssueIdentityTokenResponse> IssueTokenAsync(IssueIdentityTokenRequest request)
        {
            return Task.FromResult(new IssueIdentityTokenResponse("token-xyz", 1800));
        }

        public Task<EvaluateIdentityPolicyResponse> EvaluatePolicyAsync(EvaluateIdentityPolicyRequest request)
        {
            return Task.FromResult(new EvaluateIdentityPolicyResponse(request.SubjectId, request.PermissionCode, true));
        }

        public Task<RefreshIdentitySessionResponse> RefreshSessionAsync(RefreshIdentitySessionRequest request)
        {
            return Task.FromResult(new RefreshIdentitySessionResponse("token-refreshed", 1800));
        }
    }

    private sealed class FakeIdentityEdgeContractAdapter : IIdentityEdgeContractAdapter
    {
        public EvaluateIdentityPolicyRequest ToPolicyRequest(IssueTokenApiRequest request, string permissionCode)
        {
            return new EvaluateIdentityPolicyRequest(request.SubjectId, request.TenantId, permissionCode);
        }

        public IssueIdentityTokenRequest ToIssueTokenRequest(IssueTokenApiRequest request)
        {
            return new IssueIdentityTokenRequest(request.SubjectId, request.TenantId);
        }

        public IssueTokenApiResponse ToIssueTokenApiResponse(IssueIdentityTokenResponse response)
        {
            return new IssueTokenApiResponse(response.Token, response.ExpiresInSeconds);
        }

        public RefreshIdentitySessionRequest ToRefreshSessionRequest(RefreshSessionApiRequest request)
        {
            return new RefreshIdentitySessionRequest(request.RefreshToken, request.CorrelationId);
        }

        public RefreshSessionApiResponse ToRefreshSessionApiResponse(RefreshIdentitySessionResponse response)
        {
            return new RefreshSessionApiResponse(response.Token, response.ExpiresInSeconds);
        }
    }

    private sealed class AllowPermissionGuard : IPermissionGuard
    {
        public bool CanAccess(EvaluateIdentityPolicyResponse policyResponse) => policyResponse.IsAllowed;
    }
}