using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.AbCip.Import;

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

[Trait("Category", "Unit")]
public sealed class L5xParserTests
{
    [Fact]
    public void Controller_scope_Tag_elements_parse_with_metadata()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content SchemaRevision="1.0" SoftwareRevision="32.00">
              <Controller Name="MyController" ProcessorType="1756-L83E">
                <Tags>
                  <Tag Name="Motor1_Speed" TagType="Base" DataType="DINT" ExternalAccess="Read/Write">
                    <Description><![CDATA[Motor 1 set point]]></Description>
                  </Tag>
                  <Tag Name="Tank_Level" TagType="Base" DataType="REAL" ExternalAccess="Read Only" />
                </Tags>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));

        doc.Tags.Count.ShouldBe(2);
        doc.Tags[0].Name.ShouldBe("Motor1_Speed");
        doc.Tags[0].DataType.ShouldBe("DINT");
        doc.Tags[0].ExternalAccess.ShouldBe("Read/Write");
        doc.Tags[0].Description.ShouldBe("Motor 1 set point");
        doc.Tags[0].ProgramScope.ShouldBeNull();
        doc.Tags[0].AliasFor.ShouldBeNull();

        doc.Tags[1].Name.ShouldBe("Tank_Level");
        doc.Tags[1].ExternalAccess.ShouldBe("Read Only");
    }

    [Fact]
    public void Program_scope_Tag_elements_carry_program_name()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <Programs>
                  <Program Name="MainProgram" Class="Standard">
                    <Tags>
                      <Tag Name="StepIndex" TagType="Base" DataType="DINT" />
                      <Tag Name="Running" TagType="Base" DataType="BOOL" />
                    </Tags>
                  </Program>
                </Programs>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));

        doc.Tags.Count.ShouldBe(2);
        doc.Tags.ShouldAllBe(t => t.ProgramScope == "MainProgram");
        doc.Tags.Select(t => t.Name).ShouldBe(["StepIndex", "Running"]);
    }

    [Fact]
    public void Alias_tag_carries_AliasFor_and_is_skipped_on_ingest()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <Tags>
                  <Tag Name="Real" TagType="Base" DataType="DINT" />
                  <Tag Name="Aliased" TagType="Alias" AliasFor="Real" ExternalAccess="Read/Write" />
                </Tags>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));
        var alias = doc.Tags.Single(t => t.Name == "Aliased");
        alias.AliasFor.ShouldBe("Real");

        var ingestResult = new L5kIngest { DefaultDeviceHostAddress = "ab://10.0.0.1/0,1" }.Ingest(doc);
        ingestResult.SkippedAliasCount.ShouldBe(1);
        ingestResult.Tags.ShouldAllBe(t => t.Name != "Aliased");
    }

    [Fact]
    public void DataType_block_collects_member_elements_and_skips_hidden_zzzz_host()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <DataTypes>
                  <DataType Name="TankUDT" Class="User">
                    <Members>
                      <Member Name="ZZZZZZZZZZTankUDT0" DataType="SINT" Hidden="true" />
                      <Member Name="Level" DataType="REAL" ExternalAccess="Read/Write" />
                      <Member Name="Active" DataType="BIT" Target="ZZZZZZZZZZTankUDT0" BitNumber="0" />
                    </Members>
                  </DataType>
                </DataTypes>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));

        doc.DataTypes.Count.ShouldBe(1);
        var udt = doc.DataTypes[0];
        udt.Name.ShouldBe("TankUDT");
        udt.Members.Count.ShouldBe(2);
        udt.Members.ShouldContain(m => m.Name == "Level" && m.DataType == "REAL");
        udt.Members.ShouldContain(m => m.Name == "Active");
    }

    [Fact]
    public void UDT_typed_tag_picks_up_member_layout_through_ingest()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <DataTypes>
                  <DataType Name="TankUDT" Class="User">
                    <Members>
                      <Member Name="Level" DataType="REAL" />
                      <Member Name="Pressure" DataType="REAL" />
                    </Members>
                  </DataType>
                </DataTypes>
                <Tags>
                  <Tag Name="Tank1" TagType="Base" DataType="TankUDT" />
                </Tags>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));
        var result = new L5kIngest { DefaultDeviceHostAddress = "ab://10.0.0.1/0,1" }.Ingest(doc);

        var tag = result.Tags.Single();
        tag.Name.ShouldBe("Tank1");
        tag.DataType.ShouldBe(AbCipDataType.Structure);
        tag.Members.ShouldNotBeNull();
        tag.Members!.Count.ShouldBe(2);
        tag.Members.Select(m => m.Name).ShouldBe(["Level", "Pressure"]);
    }

    [Fact]
    public void AOI_definition_surfaces_as_datatype_with_visible_parameters()
    {
        // EnableIn / EnableOut on real exports carry Hidden="true" — the parser must skip those
        // so AOI-typed tags don't end up with phantom EnableIn/EnableOut members.
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <AddOnInstructionDefinitions>
                  <AddOnInstructionDefinition Name="MyValveAoi" Revision="1.0">
                    <Parameters>
                      <Parameter Name="EnableIn" TagType="Base" DataType="BOOL" Usage="Input" Hidden="true" />
                      <Parameter Name="EnableOut" TagType="Base" DataType="BOOL" Usage="Output" Hidden="true" />
                      <Parameter Name="Cmd" TagType="Base" DataType="BOOL" Usage="Input" />
                      <Parameter Name="Status" TagType="Base" DataType="DINT" Usage="Output" ExternalAccess="Read Only" />
                    </Parameters>
                  </AddOnInstructionDefinition>
                </AddOnInstructionDefinitions>
                <Tags>
                  <Tag Name="Valve_001" TagType="Base" DataType="MyValveAoi" />
                </Tags>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));
        // AOI definition should appear as a "DataType" entry alongside any UDTs.
        var aoi = doc.DataTypes.Single(d => d.Name == "MyValveAoi");
        aoi.Members.Count.ShouldBe(2);
        aoi.Members.Select(m => m.Name).ShouldBe(["Cmd", "Status"]);

        var result = new L5kIngest { DefaultDeviceHostAddress = "ab://10.0.0.1/0,1" }.Ingest(doc);
        var tag = result.Tags.Single();
        tag.Name.ShouldBe("Valve_001");
        tag.DataType.ShouldBe(AbCipDataType.Structure);
        tag.Members.ShouldNotBeNull();
        tag.Members!.Select(m => m.Name).ShouldBe(["Cmd", "Status"]);
    }

    [Fact]
    public void Empty_or_minimal_document_returns_empty_bundle_without_throwing()
    {
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C" />
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));
        doc.Tags.Count.ShouldBe(0);
        doc.DataTypes.Count.ShouldBe(0);
    }

    [Fact]
    public void Missing_external_access_defaults_to_writable_through_ingest()
    {
        // L5X: ExternalAccess attribute absent → ingest treats as default (writable, not skipped).
        const string body = """
            <?xml version="1.0" encoding="UTF-8"?>
            <RSLogix5000Content>
              <Controller Name="C">
                <Tags>
                  <Tag Name="Plain" TagType="Base" DataType="DINT" />
                </Tags>
              </Controller>
            </RSLogix5000Content>
            """;

        var doc = L5xParser.Parse(new StringL5kSource(body));
        var result = new L5kIngest { DefaultDeviceHostAddress = "ab://10.0.0.1/0,1" }.Ingest(doc);

        result.Tags.Single().Writable.ShouldBeTrue();
        result.SkippedNoAccessCount.ShouldBe(0);
    }
}