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

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

/// <summary>
///     Axis-name (0x0089) / spindle-name (0x008A) record decode. Each record is 4 bytes; the name is
///     the ASCII up to the record's FIRST NUL. Ported from the sister ignitionoee FOCAS driver
///     (Focas.Wire-001 and Focas.Wire-022, v0.18.1).
/// </summary>
/// <remarks>
///     <para><b>Reading only 2 bytes collides real names.</b> The live 31i-B capture
///     (<c>ref-axisname-0x0089.bin</c>) carries <c>"AA6"</c> and <c>"AA7"</c>; the old 2-byte read
///     turned both into <c>"AA"</c>, which is exactly the "one observed Makino returns two axis
///     folders both called AA" that Gitea #548 then had to disambiguate as <c>AA_1</c>/<c>AA_2</c>.</para>
///     <para><b>Trailing-only trimming keeps buffer residue.</b> A control writes only the bytes the
///     name needs; on Makino Z-34184 (2026-08-19) <c>cnc_rdspdlname</c> came back
///     <c>53 31 00 4e</c> — <c>"S1"</c> then the <c>'N'</c> of an earlier <c>"CNC"</c>. The name
///     ends at the first NUL.</para>
/// </remarks>
[Trait("Category", "Unit")]
public sealed class FocasNameRecordTests
{
    [Fact]
    public void The_live_axis_name_capture_keeps_three_character_names_distinct()
    {
        var payload = WireFixtures.Payload("ref-axisname-0x0089.bin", 0x0089);

        var names = FocasWireClient.ReadNameRecords(payload, 32, (index, name) => (index, name));

        names.Select(n => n.name).ShouldBe(["X", "Y", "Z", "B", "C", "AA6", "AA7"]);
        names.Select(n => n.index).ShouldBe([(short)1, 2, 3, 4, 5, 6, 7]);
    }

    [Fact]
    public void The_live_spindle_name_capture_decodes()
    {
        var payload = WireFixtures.Payload("ref-spdlname-0x008a.bin", 0x008a);

        FocasWireClient.ReadNameRecords(payload, 8, (_, name) => name).ShouldBe(["S1"]);
    }

    [Fact]
    public void A_name_ends_at_its_first_NUL_so_residue_after_it_is_discarded()
    {
        // The Z-34184 spindle-name record: "S1", NUL, then an 'N' left over from a previous "CNC".
        FocasWireProtocol.ReadNameRecord([0x53, 0x31, 0x00, 0x4e]).ShouldBe("S1");
        // A single-character name with residue in BOTH trailing bytes.
        FocasWireProtocol.ReadNameRecord([0x58, 0x00, 0x43, 0x4e]).ShouldBe("X");
    }

    [Fact]
    public void All_four_record_bytes_are_name_bytes()
    {
        FocasWireProtocol.ReadNameRecord("AA6\0"u8.ToArray()).ShouldBe("AA6");
        FocasWireProtocol.ReadNameRecord("ABCD"u8.ToArray()).ShouldBe("ABCD");
        FocasWireProtocol.ReadNameRecord("X \0\0"u8.ToArray()).ShouldBe("X");
    }

    [Fact]
    public void A_record_that_starts_with_NUL_is_blank()
    {
        FocasWireProtocol.ReadNameRecord([0x00, 0x41, 0x41, 0x00]).ShouldBe(string.Empty);
    }

    [Fact]
    public void Servo_meter_names_come_out_whole_too()
    {
        var blocks = WireFixtures.Blocks("svmeter-pair-0x0056-0x0089.bin");
        var sv = blocks.First(b => b.Command == 0x0056).Payload;
        var names = blocks.First(b => b.Command == 0x0089).Payload;

        var meters = FocasWireClient.ParseServoMeters(sv, names, maxCount: 32);

        meters.Take(7).Select(m => m.Name).ShouldBe(["X", "Y", "Z", "B", "C", "AA6", "AA7"]);
    }
}