using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Wire;

namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;

/// <summary>Gitea #647 — the <c>ALARM:</c> address grammar, shared by the editor, the deploy gate and the driver.</summary>
[Trait("Category", "Unit")]
public sealed class FocasAlarmSelectorTests
{
    [Theory]
    [InlineData("ALARM:*", "ALARM:*")]
    [InlineData("alarm:other", "ALARM:OTHER")]
    [InlineData("ALARM:servo", "ALARM:Servo")]
    [InlineData("ALARM:Servo/401", "ALARM:Servo/401")]
    [InlineData("ALARM:SERVO/401-453", "ALARM:Servo/401-453")]
    [InlineData("ALARM:Servo/401-401", "ALARM:Servo/401")]
    [InlineData("ALARM:T9", "ALARM:T9")]
    [InlineData("ALARM:t9/750-758", "ALARM:T9/750-758")]
    [InlineData("  ALARM:MacroAlarm/3000  ", "ALARM:MacroAlarm/3000")]
    public void Valid_selectors_parse_to_their_canonical_form(string address, string canonical)
    {
        var parsed = FocasAddress.TryParse(address);
        parsed.ShouldNotBeNull();
        parsed.Kind.ShouldBe(FocasAreaKind.Alarm);
        parsed.Canonical.ShouldBe(canonical);
        FocasAddress.TryParse(parsed.Canonical)!.Canonical.ShouldBe(canonical, "canonical must round-trip");
        FocasAddress.DescribeAlarmAddressError(address).ShouldBeNull();
    }

    [Theory]
    [InlineData("ALARM:")]
    [InlineData("ALARM:Bogus")]
    [InlineData("ALARM:Servo/")]
    [InlineData("ALARM:Servo/x")]
    [InlineData("ALARM:Servo/-5")]
    [InlineData("ALARM:Servo/10-5")]
    [InlineData("ALARM:Servo/1-")]
    [InlineData("ALARM:T")]
    [InlineData("ALARM:T-1")]
    [InlineData("ALARM:T99999")]
    [InlineData("ALARM:Servo /401")]
    [InlineData("ALARM:*/401")]
    public void Malformed_selectors_are_refused_with_a_reason(string address)
    {
        FocasAddress.TryParse(address).ShouldBeNull();
        FocasAddress.DescribeAlarmAddressError(address).ShouldNotBeNullOrWhiteSpace();
    }

    /// <summary>"A" is a PMC letter — an ALARM: address must be owned by the alarm rule, never mis-read as PMC.</summary>
    [Fact]
    public void Alarm_prefix_is_not_read_as_a_PMC_A_address()
    {
        FocasAddress.TryParse("A10")!.Kind.ShouldBe(FocasAreaKind.Pmc);
        FocasAddress.TryParse("ALARM:*")!.Kind.ShouldBe(FocasAreaKind.Alarm);
        FocasAddress.DescribeAlarmAddressError("A10").ShouldBeNull("not an ALARM: address at all");
    }

    [Fact]
    public void Type_selector_matches_on_type_and_inclusive_number_range()
    {
        var range = FocasAlarmSelector.TryParse("Servo/401-453")!;
        range.Matches(FocasAlarmType.Servo, 401).ShouldBeTrue();
        range.Matches(FocasAlarmType.Servo, 453).ShouldBeTrue();
        range.Matches(FocasAlarmType.Servo, 454).ShouldBeFalse();
        range.Matches(FocasAlarmType.Overtravel, 401).ShouldBeFalse("(type, number) is the identity");

        var any = FocasAlarmSelector.TryParse("*")!;
        any.Matches(FocasAlarmType.Overheat, 1).ShouldBeTrue();

        // OTHER depends on the device's other selectors, so it never matches on its own terms.
        FocasAlarmSelector.TryParse("OTHER")!.Matches(FocasAlarmType.Servo, 401).ShouldBeFalse();

        // A raw code selects exactly that code — the series-independent form.
        FocasAlarmSelector.TryParse("T4")!.Matches(FocasAlarmType.Servo, 1).ShouldBeTrue();
        FocasAlarmSelector.TryParse("T9")!.Matches(FocasAlarmType.Servo, 1).ShouldBeFalse();
    }

    [Fact]
    public void Every_named_type_resolves_through_the_one_table()
    {
        foreach (var name in FocasAlarmType.Names)
        {
            FocasAlarmType.TryResolve(name.ToUpperInvariant(), out var code).ShouldBeTrue(name);
            FocasAlarmType.NameOf(code).ShouldBe(name);
        }
        FocasAlarmType.NameOf(9).ShouldBeNull("codes outside the 16i-era table are not invented");
    }

    [Fact]
    public void Capability_matrix_accepts_an_alarm_address_on_every_series()
    {
        var address = FocasAddress.TryParse("ALARM:Servo/401")!;
        foreach (var series in Enum.GetValues<FocasCncSeries>())
            FocasCapabilityMatrix.Validate(series, address).ShouldBeNull(series.ToString());
    }

    // ---- the deploy-time inspector (the gate CSV import / API authoring meets) ----

    [Fact]
    public void Inspect_is_clean_for_an_alarm_selector_with_its_alarm_object()
    {
        FocasTagDefinitionFactory.Inspect("""{"address":"ALARM:Servo/401-453","dataType":"Int32","alarm":{"severity":800}}""")
            .ShouldBeEmpty();
    }

    [Fact]
    public void Inspect_advises_when_an_alarm_selector_has_no_alarm_object_or_an_alarm_object_has_no_selector()
    {
        FocasTagDefinitionFactory.Inspect("""{"address":"ALARM:*","dataType":"Int32"}""")
            .ShouldHaveSingleItem().ShouldContain("no 'alarm' object");
        FocasTagDefinitionFactory.Inspect("""{"address":"R100","dataType":"Byte","alarm":{}}""")
            .ShouldHaveSingleItem().ShouldContain("not an ALARM: selector");
    }

    [Fact]
    public void Inspect_names_the_selector_fault_for_a_malformed_alarm_address()
    {
        var warning = FocasTagDefinitionFactory.Inspect("""{"address":"ALARM:Servo/10-5","alarm":{}}""").ShouldHaveSingleItem();
        warning.ShouldContain("reversed");
        warning.ShouldContain(FocasAddress.DescribeAlarmAddressError("ALARM:Servo/10-5")!,
            customMessage: "the gate and the editor must say the same thing about the same string");
    }

    [Fact]
    public void The_mapper_reads_the_alarm_object_and_its_optional_integer_severity()
    {
        FocasTagDefinitionFactory.FromTagConfig("""{"address":"ALARM:*","alarm":{"severity":650}}""", "p", out var a).ShouldBeTrue();
        a.Alarm.ShouldBe(new FocasTagAlarm(650));
        FocasTagDefinitionFactory.FromTagConfig("""{"address":"ALARM:*","alarm":{"severity":"high"}}""", "p", out var b).ShouldBeTrue();
        b.Alarm.ShouldBe(new FocasTagAlarm(null));
        FocasTagDefinitionFactory.FromTagConfig("""{"address":"R100"}""", "p", out var c).ShouldBeTrue();
        c.Alarm.ShouldBeNull();
    }

    /// <summary>
    ///     Gitea #647 review MINOR-5 — a non-empty alarm payload that fits neither record stride is malformed, not
    ///     "no alarms" (which would mass-clear every condition on the device). Empty stays empty.
    /// </summary>
    [Fact]
    public void A_malformed_alarm_payload_throws_while_an_empty_one_is_no_alarms()
    {
        FocasWireClient.ParseAlarms([], 32).ShouldBeEmpty();
        FocasWireClient.ParseAlarms(new byte[76], 32).Count.ShouldBe(1);
        FocasWireClient.ParseAlarms(new byte[160], 32).Count.ShouldBe(2);
        Should.Throw<FocasWireException>(() => FocasWireClient.ParseAlarms(new byte[77], 32));
        Should.Throw<FocasWireException>(() => FocasWireClient.ParseAlarms(new byte[12], 32));
    }

    /// <summary>
    ///     Gitea #647 defect 4 — a read that FAILED must not look like "no alarms": the projection would diff it
    ///     to a mass clear and re-raise everything un-acknowledged on recovery. A disconnected wire client throws.
    /// </summary>
    [Fact]
    public async Task Wire_client_ReadAlarms_throws_when_not_connected_rather_than_returning_empty()
    {
        using var client = new WireFocasClient();
        await Should.ThrowAsync<InvalidOperationException>(() => client.ReadAlarmsAsync(CancellationToken.None));
    }
}