using Moq;
using SilverOS.Welcome.Core.Apply;
using SilverOS.Welcome.Core.Apps;
using SilverOS.Welcome.Core.Flavours;
using Xunit;

/// <summary>
/// Real integration test: proves that ApplyService passes -Modules with the correct
/// encoding so that Invoke-Hardening.ps1's subset filter actually works through the
/// real ProcessStartInfo / PowerShell boundary.
///
/// SAFETY: only harmless dummy .ps1 files are executed — never the real 0*.ps1 hardening
/// modules. Invoke-Hardening.ps1 is copied into a temp dir and run against dummy stubs.
/// </summary>
public class ApplyServiceHardeningIntegrationTests
{
    /// <summary>Walk up from the test binary to find the repo root (same as ShippedFlavoursTests).</summary>
    private static string HardeningDir()
    {
        var d = AppContext.BaseDirectory;
        while (d is not null && !Directory.Exists(Path.Combine(d, "windows", "hardening")))
            d = Directory.GetParent(d)?.FullName;
        return Path.Combine(d!, "windows", "hardening");
    }

    [Fact]
    public async Task Subset_filter_runs_only_requested_modules_via_real_powershell()
    {
        // ---- Arrange: set up a temp sandbox ----
        var tmp = Path.Combine(Path.GetTempPath(), $"sm_integ_{Guid.NewGuid():N}");
        Directory.CreateDirectory(tmp);
        try
        {
            // Copy the REAL Invoke-Hardening.ps1 (the one we just patched) into the temp dir.
            var realInvoke = Path.Combine(HardeningDir(), "Invoke-Hardening.ps1");
            File.Copy(realInvoke, Path.Combine(tmp, "Invoke-Hardening.ps1"));

            // Create harmless dummy module stubs. Each just appends its prefix to ran.txt.
            var ranFile = Path.Combine(tmp, "ran.txt").Replace("\\", "\\\\");
            foreach (var (prefix, name) in new[] {
                ("00", "00-a.ps1"),
                ("03", "03-b.ps1"),
                ("05", "05-c.ps1"),
                ("07", "07-d.ps1"),
            })
            {
                // Single quotes around prefix so the string itself is written, not executed.
                await File.WriteAllTextAsync(
                    Path.Combine(tmp, name),
                    $"'RAN {prefix}' | Out-File -Append \"{ranFile.Replace("\\\\", "\\\\")}\"");
            }

            // Dummy Verify script — no-op so Invoke-Hardening.ps1's Verify step succeeds.
            await File.WriteAllTextAsync(
                Path.Combine(tmp, "Verify-SilverMetalWindows.ps1"),
                "# no-op verify");

            // ---- Arrange: mocked services so apply completes without touching real OS ----
            var acct  = new Mock<IAccountService>();
            acct.Setup(a => a.CreateAccountsAsync(
                    It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
                    It.IsAny<CancellationToken>()))
                .Returns(Task.CompletedTask);

            var bl = new Mock<IBitLockerService>();
            bl.Setup(b => b.EnableAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
              .Returns(Task.CompletedTask);

            var boot = new Mock<IBootstrapService>();
            boot.Setup(b => b.TearDownAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
                .Returns(Task.CompletedTask);

            var installer = new Mock<IAppInstaller>();
            installer.Setup(i => i.InstallAsync(
                    It.IsAny<IReadOnlyList<AppCatalogEntry>>(),
                    It.IsAny<IProgress<ApplyProgress>>(), It.IsAny<CancellationToken>()))
                .ReturnsAsync(Array.Empty<AppInstallResult>());

            var sut = new ApplyService(
                runner:     new ProcessRunner(),
                accounts:   acct.Object,
                bitlocker:  bl.Object,
                bootstrap:  boot.Object,
                installer:  installer.Object,
                hardeningDir: tmp);

            // Flavour requests modules 00 and 05 only — 03 and 07 must be skipped.
            var flavour = new FlavourManifest
            {
                Id = "test",
                Hardening = new HardeningSpec { Modules = new[] { "00", "05" } }
            };
            var req = new ApplyRequest(flavour, "alice", "pw", "adminpw", "123456", "sm-bootstrap", Array.Empty<AppCatalogEntry>());

            // ---- Act ----
            await sut.RunAsync(req, new Progress<ApplyProgress>(_ => { }));

            // ---- Assert: ran.txt should contain only 00 and 05 markers ----
            Assert.True(File.Exists(Path.Combine(tmp, "ran.txt")),
                "ran.txt was not created — no module ran at all (subset filter matched nothing)");

            var ran = await File.ReadAllTextAsync(Path.Combine(tmp, "ran.txt"));

            Assert.Contains("RAN 00", ran, StringComparison.Ordinal);
            Assert.Contains("RAN 05", ran, StringComparison.Ordinal);
            Assert.DoesNotContain("RAN 03", ran, StringComparison.Ordinal);
            Assert.DoesNotContain("RAN 07", ran, StringComparison.Ordinal);

            // ---- Assert: the rest of the apply pipeline also completed ----
            acct.Verify(a => a.CreateAccountsAsync(
                "alice", "pw", "adminpw", It.IsAny<CancellationToken>()), Times.Once);
            bl.Verify(b => b.EnableAsync("123456", It.IsAny<CancellationToken>()), Times.Once);
            boot.Verify(b => b.TearDownAsync("sm-bootstrap", It.IsAny<CancellationToken>()), Times.Once);
        }
        finally
        {
            // Clean up — ignore errors (locked files etc.) to avoid masking test failure.
            try { Directory.Delete(tmp, recursive: true); } catch { /* ignore */ }
        }
    }
}