using System.Security;
using System.Text.Json;

namespace Zcbot.WindowsNode;

internal interface IAnsysAcceptanceService
{
    bool IsAvailable { get; }
    bool IsGateEnabled { get; }

    Task<AdapterAcceptanceResult> RunAsync(
        string workRoot,
        IProgress<string> progress,
        CancellationToken cancellationToken);

    void EnableGate(string reportPath);
}

internal sealed class AnsysAcceptanceService : IAnsysAcceptanceService
{
    private const string Capability = "ansys.mechanical.static_structural@v2";
    private const string GateEnvironmentVariable = "ZCBOT_ANSYS_242_VALIDATED";
    private readonly INodeAdapter? adapter;

    internal AnsysAcceptanceService(NodePaths paths)
    {
        adapter = AdapterCatalog.CreateDefault(
            new JobRepository(paths.JobsDirectory),
            paths).Find(Capability);
    }

    public bool IsAvailable => adapter?.SupportsLocalAcceptance == true;

    public bool IsGateEnabled => Environment.GetEnvironmentVariable(
        GateEnvironmentVariable,
        EnvironmentVariableTarget.Machine) == "1";

    public Task<AdapterAcceptanceResult> RunAsync(
        string workRoot,
        IProgress<string> progress,
        CancellationToken cancellationToken) =>
        IsAvailable
            ? adapter!.RunLocalAcceptanceAsync(workRoot, progress, cancellationToken)
            : throw new InvalidOperationException(
                "当前安装包没有 ANSYS 验收工具。请先安装新版完整 Node 包。");

    public void EnableGate(string reportPath)
    {
        if (!ReportPassed(reportPath))
        {
            throw new InvalidDataException("没有可验证的本次验收通过报告，执行门不会开启。");
        }
        Environment.SetEnvironmentVariable(
            GateEnvironmentVariable,
            "1",
            EnvironmentVariableTarget.Machine);
    }

    internal static bool ReportPassed(string path)
    {
        try
        {
            using var document = JsonDocument.Parse(File.ReadAllBytes(path));
            return document.RootElement.TryGetProperty("passed", out var passed)
                && passed.ValueKind == JsonValueKind.True;
        }
        catch (Exception exception) when (
            exception is IOException
                or JsonException
                or SecurityException
                or UnauthorizedAccessException)
        {
            return false;
        }
    }
}