using System;
using System.Collections.Generic;
using System.Linq;
using CycloneDX.Models;
using StellaOps.Scanner.Emit.Spdx.Conversion;
using Xunit;

namespace StellaOps.Scanner.Emit.Tests.Composition;

public sealed class SpdxCycloneDxConversionTests
{
    [Fact]
    public void Converts_CycloneDx_To_Spdx()
    {
        var bom = BuildBom();

        var spdx = SpdxCycloneDxConverter.FromCycloneDx(bom);

        var packages = spdx.Elements.OfType<StellaOps.Scanner.Emit.Spdx.Models.SpdxPackage>().ToArray();
        Assert.Equal(2, packages.Length);
        Assert.Contains(packages, pkg => pkg.Name == "demo-app");
        Assert.Contains(spdx.Relationships, rel => rel.Type == StellaOps.Scanner.Emit.Spdx.Models.SpdxRelationshipType.DependsOn);
    }

    [Fact]
    public void Converts_Spdx_To_CycloneDx()
    {
        var bom = BuildBom();
        var spdx = SpdxCycloneDxConverter.FromCycloneDx(bom);

        var converted = SpdxCycloneDxConverter.ToCycloneDx(spdx);

        Assert.NotNull(converted.Metadata);
        Assert.NotNull(converted.Components);
        Assert.Contains(converted.Components!, component => component.Name == "dependency");
    }

    private static Bom BuildBom()
    {
        var root = new Component
        {
            BomRef = "root",
            Name = "demo-app",
            Version = "1.0.0",
            Type = Component.Classification.Application
        };

        var dependency = new Component
        {
            BomRef = "dep",
            Name = "dependency",
            Version = "2.0.0",
            Type = Component.Classification.Library
        };

        return new Bom
        {
            SpecVersion = SpecificationVersion.v1_7,
            Version = 1,
            Metadata = new Metadata
            {
                Timestamp = new DateTime(2025, 10, 20, 0, 0, 0, DateTimeKind.Utc),
                Component = root
            },
            Components = new List<Component> { dependency },
            Dependencies = new List<Dependency>
            {
                new()
                {
                    Ref = root.BomRef,
                    Dependencies = new List<Dependency> { new() { Ref = dependency.BomRef } }
                }
            }
        };
    }
}