using System;
using System.Linq;
using FluentAssertions;
using StellaOps.TestKit.Interop;
using Xunit;

namespace StellaOps.TestKit.Tests;

public sealed partial class InteropTests
{
    [Fact]
    public void SchemaVersionMatrix_Analyze_GeneratesReport()
    {
        var matrix = new SchemaVersionMatrix();
        matrix.AddVersion("1.0", new SchemaDefinition { RequiredFields = ["id"] });
        matrix.AddVersion("2.0", new SchemaDefinition { RequiredFields = ["id", "name"] });

        var report = matrix.Analyze();

        report.Versions.Should().Contain(["1.0", "2.0"]);
        report.Pairs.Should().HaveCount(2);
        report.GeneratedAt.Should().NotBe(default);
        report.GeneratedAt.Offset.Should().Be(TimeSpan.Zero);
    }

    [Fact]
    public void SchemaVersionMatrix_Analyze_SortsVersions()
    {
        var matrix = new SchemaVersionMatrix();
        matrix.AddVersion("2.0", new SchemaDefinition { RequiredFields = ["id"] });
        matrix.AddVersion("1.0", new SchemaDefinition { RequiredFields = ["id"] });

        var report = matrix.Analyze();

        report.Versions.Should().ContainInOrder("1.0", "2.0");
    }

    [Fact]
    public void SchemaVersionMatrix_Analyze_DetectsTypeChanges()
    {
        var matrix = new SchemaVersionMatrix();
        matrix.AddVersion("1.0", new SchemaDefinition
        {
            RequiredFields = ["id"],
            FieldTypes = new() { ["id"] = "int" }
        });
        matrix.AddVersion("2.0", new SchemaDefinition
        {
            RequiredFields = ["id"],
            FieldTypes = new() { ["id"] = "string" }
        });

        var report = matrix.Analyze();

        var pair = report.Pairs.First(p => p.FromVersion == "1.0" && p.ToVersion == "2.0");
        pair.IsBackwardCompatible.Should().BeFalse();
        pair.BackwardIssues.Should().Contain(i => i.Contains("Type changed"));
    }
}