using System.IO;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Driver.S7.SymbolImport;

namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests.SymbolImport;

/// <summary>
///     Coverage for <c>S7DriverFactoryExtensions.AddTiaCsvImport</c> and
///     <c>AddAwlImport</c>. The extension methods are thin wrappers around the importers
///     so the surface area to test is the merge behaviour + result propagation.
/// </summary>
[Trait("Category", "Unit")]
public sealed class S7DriverFactoryAddImportTests
{
    [Fact]
    public void AddTiaCsvImport_concatenates_imported_tags_onto_existing_options()
    {
        var path = Path.Combine(Path.GetTempPath(), $"tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, """
            Name,Path,Data type,Logical address,Comment,Hmi accessible
            Imported1,T,Int,%MW0,desc,True
            Imported2,T,Real,%MD4,desc,True
            """);
        try
        {
            var existing = new S7TagDefinition("PreExisting", "MW10", S7DataType.Int16);
            var options = new S7DriverOptions
            {
                Host = "192.168.1.10",
                Tags = [existing],
            };

            var updated = options.AddTiaCsvImport(path, out var result);

            result.ParsedCount.ShouldBe(2);
            updated.Tags.Count.ShouldBe(3);
            updated.Tags[0].Name.ShouldBe("PreExisting");
            updated.Tags[1].Name.ShouldBe("Imported1");
            updated.Tags[2].Name.ShouldBe("Imported2");

            // Other options fields propagate untouched.
            updated.Host.ShouldBe("192.168.1.10");
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public void AddTiaCsvImportWithResult_returns_options_and_result_tuple()
    {
        var path = Path.Combine(Path.GetTempPath(), $"tia-{Guid.NewGuid():N}.csv");
        File.WriteAllText(path, """
            Name,Path,Data type,Logical address,Comment,Hmi accessible
            T,P,Int,%MW0,d,True
            """);
        try
        {
            var (updated, result) = new S7DriverOptions { Host = "h" }.AddTiaCsvImportWithResult(path);
            updated.Tags.Count.ShouldBe(1);
            result.ParsedCount.ShouldBe(1);
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }

    [Fact]
    public void AddAwlImport_appends_var_global_declarations()
    {
        var path = Path.Combine(Path.GetTempPath(), $"awl-{Guid.NewGuid():N}.awl");
        File.WriteAllText(path, """
            VAR_GLOBAL
              Speed : INT;
              Pressure : REAL;
            END_VAR
            """);
        try
        {
            var options = new S7DriverOptions { Host = "h", Tags = [] };
            var updated = options.AddAwlImport(path, out var result);
            result.ParsedCount.ShouldBe(2);
            updated.Tags.Count.ShouldBe(2);
            updated.Tags[0].Address.ShouldBe("MW0");
            updated.Tags[1].Address.ShouldBe("MD2");
        }
        finally
        {
            try { File.Delete(path); } catch { /* best-effort */ }
        }
    }
}