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

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

/// <summary>
///     Covers follow-up E projection: <see cref="EquipmentNode"/> carries the equipment's
///     <c>DriverInstanceId</c> / <c>DeviceId</c> bindings and the resolved <c>DeviceHost</c> (parsed from
///     the bound <see cref="Device"/>'s schemaless <c>DeviceConfig</c> JSON via the shared
///     <see cref="AddressSpaceComposer.TryExtractDeviceHost"/>). A later task grafts a driver's discovered
///     FixedTree onto a zero-tag equipment and partitions a multi-device driver by host using these.
/// </summary>
public sealed class AddressSpaceComposerDeviceHostTests
{
    /// <summary>An equipment bound to a driver + a device whose config carries a top-level
    /// <c>HostAddress</c> resolves all three fields, with the host trimmed + lower-cased.</summary>
    [Fact]
    public void Compose_resolves_driver_device_and_device_host()
    {
        var equipment = new[] { NewEquipment("eq-1", driver: "d1", device: "dev1") };
        var devices = new[] { NewDevice("dev1", "d1", "{\"HostAddress\":\"10.0.0.5:8193\"}") };

        var node = AddressSpaceComposer.Compose(
                Array.Empty<UnsArea>(), Array.Empty<UnsLine>(), equipment,
                Array.Empty<DriverInstance>(), Array.Empty<ScriptedAlarm>(), devices: devices)
            .EquipmentNodes.ShouldHaveSingleItem();

        node.EquipmentId.ShouldBe("eq-1");
        node.DriverInstanceId.ShouldBe("d1");
        node.DeviceId.ShouldBe("dev1");
        node.DeviceHost.ShouldBe("10.0.0.5:8193");
    }

    /// <summary>An equipment with no driver and no device → all three new fields null (driver-less,
    /// no device to resolve a host from).</summary>
    [Fact]
    public void Compose_equipment_without_driver_or_device_yields_null_bindings()
    {
        var equipment = new[] { NewEquipment("eq-1", driver: null, device: null) };

        var node = AddressSpaceComposer.Compose(
                Array.Empty<UnsArea>(), Array.Empty<UnsLine>(), equipment,
                Array.Empty<DriverInstance>(), Array.Empty<ScriptedAlarm>(), devices: Array.Empty<Device>())
            .EquipmentNodes.ShouldHaveSingleItem();

        node.DriverInstanceId.ShouldBeNull();
        node.DeviceId.ShouldBeNull();
        node.DeviceHost.ShouldBeNull();
    }

    /// <summary>A bound DeviceId with no matching device row, or a device whose config has no
    /// <c>HostAddress</c>, resolves DeviceHost to null while DeviceId is still carried.</summary>
    [Fact]
    public void Compose_device_host_is_null_when_unresolvable()
    {
        var equipment = new[]
        {
            NewEquipment("eq-missing", driver: "d1", device: "dev-missing"),
            NewEquipment("eq-nohost", driver: "d1", device: "dev-nohost"),
        };
        var devices = new[] { NewDevice("dev-nohost", "d1", "{\"Port\":502}") };

        var nodes = AddressSpaceComposer.Compose(
                Array.Empty<UnsArea>(), Array.Empty<UnsLine>(), equipment,
                Array.Empty<DriverInstance>(), Array.Empty<ScriptedAlarm>(), devices: devices)
            .EquipmentNodes;

        var missing = nodes.Single(n => n.EquipmentId == "eq-missing");
        missing.DeviceId.ShouldBe("dev-missing");
        missing.DeviceHost.ShouldBeNull();

        var noHost = nodes.Single(n => n.EquipmentId == "eq-nohost");
        noHost.DeviceId.ShouldBe("dev-nohost");
        noHost.DeviceHost.ShouldBeNull();
    }

    /// <summary>The shared host extractor normalizes (trim + lower-case) and tolerates every malformed
    /// shape (blank / non-object / no string HostAddress / blank value / non-JSON) by returning null.</summary>
    [Theory]
    [InlineData("{\"HostAddress\":\"10.201.31.5:8193\"}", "10.201.31.5:8193")]
    [InlineData("{\"HostAddress\":\"  HOST-A:8193  \"}", "host-a:8193")] // trimmed + lower-cased
    [InlineData("{\"HostAddress\":\"\"}", null)]                          // blank value
    [InlineData("{\"HostAddress\":1234}", null)]                          // non-string
    [InlineData("{\"Port\":502}", null)]                                  // absent
    [InlineData("[]", null)]                                              // non-object root
    [InlineData("not json", null)]                                       // malformed
    [InlineData("", null)]                                                // blank
    public void TryExtractDeviceHost_normalizes_and_tolerates(string? deviceConfig, string? expected)
    {
        AddressSpaceComposer.TryExtractDeviceHost(deviceConfig).ShouldBe(expected);
    }

    private static Equipment NewEquipment(string id, string? driver, string? device) => new()
    {
        EquipmentId = id,
        DriverInstanceId = driver,
        DeviceId = device,
        UnsLineId = "line-1",
        Name = id,
        MachineCode = id.ToUpperInvariant(),
    };

    private static Device NewDevice(string deviceId, string driverInstanceId, string deviceConfig) => new()
    {
        DeviceId = deviceId,
        DriverInstanceId = driverInstanceId,
        Name = deviceId,
        DeviceConfig = deviceConfig,
    };
}