using System.Text;
using FluentAssertions;
using StellaOps.Interop;
using Xunit;
namespace StellaOps.Interop.Tests;

public sealed partial class ToolManagerTests
{
    [Fact]
    public void ResolveToolPath_UsesConfiguredPath()
    {
        var workDir = CreateTempDirectory();
        try
        {
            var toolPath = Path.Combine(workDir, OperatingSystem.IsWindows() ? "stub-tool.exe" : "stub-tool");
            File.WriteAllText(toolPath, "stub", Encoding.ASCII);

            var toolPaths = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
            {
                ["stub-tool"] = toolPath
            };

            var manager = new ToolManager(workDir, toolPaths);

            manager.ResolveToolPath("stub-tool").Should().Be(toolPath);
        }
        finally
        {
            DeleteDirectory(workDir);
        }
    }

    [Fact]
    public void ResolveToolPath_UsesPathProbe()
    {
        var workDir = CreateTempDirectory();
        var toolDir = CreateTempDirectory();
        var originalPath = Environment.GetEnvironmentVariable("PATH");
        try
        {
            var toolFile = OperatingSystem.IsWindows() ? "probe-tool.exe" : "probe-tool";
            var toolPath = Path.Combine(toolDir, toolFile);
            File.WriteAllText(toolPath, "stub", Encoding.ASCII);

            Environment.SetEnvironmentVariable("PATH", toolDir);

            var manager = new ToolManager(workDir);
            manager.ResolveToolPath("probe-tool").Should().Be(toolPath);
        }
        finally
        {
            Environment.SetEnvironmentVariable("PATH", originalPath);
            DeleteDirectory(toolDir);
            DeleteDirectory(workDir);
        }
    }

    [Fact]
    public void FindOnPath_ReturnsNull_WhenPathMissing()
    {
        var originalPath = Environment.GetEnvironmentVariable("PATH");
        try
        {
            Environment.SetEnvironmentVariable("PATH", string.Empty);

            ToolManager.FindOnPath("missing-tool").Should().BeNull();
        }
        finally
        {
            Environment.SetEnvironmentVariable("PATH", originalPath);
        }
    }

}