using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Admin.Services;

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

[Trait("Category", "Unit")]
public sealed class EquipmentCsvImporterTests
{
    private const string Header =
        "# OtOpcUaCsv v1\n" +
        "ZTag,MachineCode,SAPID,EquipmentId,EquipmentUuid,Name,UnsAreaName,UnsLineName";

    [Fact]
    public void EmptyFile_Throws()
    {
        Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(""));
    }

    [Fact]
    public void MissingVersionMarker_Throws()
    {
        var csv = "ZTag,MachineCode,SAPID,EquipmentId,EquipmentUuid,Name,UnsAreaName,UnsLineName\nx,x,x,x,x,x,x,x";

        var ex = Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(csv));
        ex.Message.ShouldContain("# OtOpcUaCsv v1");
    }

    [Fact]
    public void MissingRequiredColumn_Throws()
    {
        var csv = "# OtOpcUaCsv v1\n" +
                  "ZTag,MachineCode,SAPID,EquipmentId,Name,UnsAreaName,UnsLineName\n" +
                  "z1,mc,sap,eq1,Name1,area,line";

        var ex = Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(csv));
        ex.Message.ShouldContain("EquipmentUuid");
    }

    [Fact]
    public void UnknownColumn_Throws()
    {
        var csv = Header + ",WeirdColumn\nz1,mc,sap,eq1,uu,Name1,area,line,value";

        var ex = Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(csv));
        ex.Message.ShouldContain("WeirdColumn");
    }

    [Fact]
    public void DuplicateColumn_Throws()
    {
        var csv = "# OtOpcUaCsv v1\n" +
                  "ZTag,ZTag,MachineCode,SAPID,EquipmentId,EquipmentUuid,Name,UnsAreaName,UnsLineName\n" +
                  "z1,z1,mc,sap,eq,uu,Name,area,line";

        Should.Throw<InvalidCsvFormatException>(() => EquipmentCsvImporter.Parse(csv));
    }

    [Fact]
    public void ValidSingleRow_RoundTrips()
    {
        var csv = Header + "\nz-001,MC-1,SAP-1,eq-001,uuid-1,Oven-A,Warsaw,Line-1";

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.Count.ShouldBe(1);
        result.RejectedRows.ShouldBeEmpty();
        var row = result.AcceptedRows[0];
        row.ZTag.ShouldBe("z-001");
        row.MachineCode.ShouldBe("MC-1");
        row.Name.ShouldBe("Oven-A");
        row.UnsLineName.ShouldBe("Line-1");
    }

    [Fact]
    public void OptionalColumns_Populated_WhenPresent()
    {
        var csv = "# OtOpcUaCsv v1\n" +
                  "ZTag,MachineCode,SAPID,EquipmentId,EquipmentUuid,Name,UnsAreaName,UnsLineName,Manufacturer,Model,SerialNumber,HardwareRevision,SoftwareRevision,YearOfConstruction,AssetLocation,ManufacturerUri,DeviceManualUri\n" +
                  "z-1,MC,SAP,eq,uuid,Oven,Warsaw,Line1,Siemens,S7-1500,SN123,Rev-1,Fw-2.3,2023,Bldg-3,https://siemens.example,https://siemens.example/manual";

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.Count.ShouldBe(1);
        var row = result.AcceptedRows[0];
        row.Manufacturer.ShouldBe("Siemens");
        row.Model.ShouldBe("S7-1500");
        row.SerialNumber.ShouldBe("SN123");
        row.YearOfConstruction.ShouldBe("2023");
        row.ManufacturerUri.ShouldBe("https://siemens.example");
    }

    [Fact]
    public void BlankRequiredField_Rejects_Row()
    {
        var csv = Header + "\nz-1,MC,SAP,eq,uuid,,Warsaw,Line1"; // Name blank

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.ShouldBeEmpty();
        result.RejectedRows.Count.ShouldBe(1);
        result.RejectedRows[0].Reason.ShouldContain("Name");
    }

    [Fact]
    public void DuplicateZTag_Rejects_SecondRow()
    {
        var csv = Header +
                  "\nz-1,MC1,SAP1,eq1,u1,N1,A,L1" +
                  "\nz-1,MC2,SAP2,eq2,u2,N2,A,L1";

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.Count.ShouldBe(1);
        result.RejectedRows.Count.ShouldBe(1);
        result.RejectedRows[0].Reason.ShouldContain("Duplicate ZTag");
    }

    [Fact]
    public void QuotedField_With_CommaAndQuote_Parses_Correctly()
    {
        // RFC 4180: "" inside a quoted field is an escaped quote.
        var csv = Header +
                  "\n\"z-1\",\"MC\",\"SAP,with,commas\",\"eq\",\"uuid\",\"Oven \"\"Ultra\"\"\",\"Warsaw\",\"Line1\"";

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.Count.ShouldBe(1);
        result.AcceptedRows[0].SAPID.ShouldBe("SAP,with,commas");
        result.AcceptedRows[0].Name.ShouldBe("Oven \"Ultra\"");
    }

    [Fact]
    public void MismatchedColumnCount_Rejects_Row()
    {
        var csv = Header + "\nz-1,MC,SAP,eq,uuid,Name,Warsaw"; // missing UnsLineName cell

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.ShouldBeEmpty();
        result.RejectedRows.Count.ShouldBe(1);
        result.RejectedRows[0].Reason.ShouldContain("Column count");
    }

    [Fact]
    public void BlankLines_BetweenRows_AreIgnored()
    {
        var csv = Header +
                  "\nz-1,MC,SAP,eq1,u1,N1,A,L1" +
                  "\n" +
                  "\nz-2,MC,SAP,eq2,u2,N2,A,L1";

        var result = EquipmentCsvImporter.Parse(csv);

        result.AcceptedRows.Count.ShouldBe(2);
        result.RejectedRows.ShouldBeEmpty();
    }

    [Fact]
    public void Header_Constants_Match_Decision_117_and_139()
    {
        EquipmentCsvImporter.RequiredColumns.ShouldBe(
            ["ZTag", "MachineCode", "SAPID", "EquipmentId", "EquipmentUuid", "Name", "UnsAreaName", "UnsLineName"]);

        EquipmentCsvImporter.OptionalColumns.ShouldBe(
            ["Manufacturer", "Model", "SerialNumber", "HardwareRevision", "SoftwareRevision",
             "YearOfConstruction", "AssetLocation", "ManufacturerUri", "DeviceManualUri"]);
    }
}