using System.Text.Json;
using backend.Tools;
using FluentAssertions;
using Xunit;

namespace backend.tests;

public class GetCurrentTimeToolTests
{
    [Fact]
    public async Task Returns_now_field_with_iso_utc_timestamp()
    {
        var tool = new GetCurrentTimeTool();
        var args = JsonDocument.Parse("{}").RootElement;
        var ctx = new DeviceContext(Guid.NewGuid(), Guid.NewGuid(), new NoopChannel());

        var res = await tool.ExecuteAsync(new ToolInvocation("call_1", args), ctx, default);

        res.Output.TryGetProperty("now", out var now).Should().BeTrue();
        now.GetString().Should().MatchRegex(@"^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}");
        now.GetString()!.Should().EndWith("Z");
    }

    private class NoopChannel : IDeviceChannel
    {
        public Task<JsonElement> CallPiToolAsync(string name, JsonElement args, CancellationToken ct)
            => throw new NotSupportedException();
    }
}