using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Configuration.Entities;
using ZB.MOM.WW.OtOpcUa.Configuration.Validation;

namespace ZB.MOM.WW.OtOpcUa.Configuration.Tests;

/// <summary>
///     Gitea #628 (decision b): an MTConnect driver instance binds every tag through one agent client, so a
///     second <c>/raw</c> Device under it is a deploy error — while the normal single-Device layout stays valid.
/// </summary>
[Trait("Category", "Unit")]
public sealed class DraftValidatorMTConnectDeviceTests
{
    private const string Code = DraftValidator.MTConnectMultipleDevicesCode;

    private static DriverInstance Driver(string id, string type) => new()
    {
        DriverInstanceId = id, ClusterId = "c", Name = id, DriverType = type, DriverConfig = "{}",
    };

    private static Device Dev(string id, string driverId) => new()
    {
        DeviceId = id, DriverInstanceId = driverId, Name = id, DeviceConfig = "{}",
    };

    private static DraftSnapshot Draft(DriverInstance[] drivers, params Device[] devices) => new()
    {
        GenerationId = 1, ClusterId = "c", DriverInstances = drivers, Devices = devices,
    };

    [Fact]
    public void Two_devices_under_one_MTConnect_driver_is_a_deploy_error()
    {
        var errors = DraftValidator.Validate(Draft([Driver("mt", "MTConnect")], Dev("d1", "mt"), Dev("d2", "mt")));

        var e = errors.Where(x => x.Code == Code).ShouldHaveSingleItem();
        e.Context.ShouldBe("mt");
        e.Message.ShouldContain("one MTConnect driver per agent device");
    }

    [Fact]
    public void The_normal_single_device_layout_stays_valid()
        => DraftValidator.Validate(Draft([Driver("mt", "MTConnect")], Dev("d1", "mt")))
            .ShouldNotContain(x => x.Code == Code);

    [Fact]
    public void A_driver_with_no_device_is_not_this_rules_concern()
        => DraftValidator.Validate(Draft([Driver("mt", "MTConnect")]))
            .ShouldNotContain(x => x.Code == Code);

    [Fact]
    public void Several_devices_under_a_non_MTConnect_driver_are_unaffected_and_devices_are_counted_per_driver()
    {
        var errors = DraftValidator.Validate(Draft(
            [Driver("mb", "Modbus"), Driver("mt1", "MTConnect"), Driver("mt2", "MTConnect")],
            Dev("a", "mb"), Dev("b", "mb"), Dev("c", "mt1"), Dev("d", "mt2")));

        errors.ShouldNotContain(x => x.Code == Code);
    }
}