using System.Text;

namespace Zcbot.WindowsNode;

internal interface IDiagnosticService
{
    string Build(NodeConfig config);
}

internal sealed class DiagnosticService : IDiagnosticService
{
    private readonly NodePaths paths;
    private readonly AdapterCatalog adapters;

    internal DiagnosticService(NodePaths paths)
    {
        this.paths = paths;
        adapters = AdapterCatalog.CreateDefault(new JobRepository(paths.JobsDirectory), paths);
    }

    public string Build(NodeConfig config)
    {
        var builder = new StringBuilder()
            .AppendLine("zcbot Windows Node diagnostics")
            .AppendLine($"Node: {config.NodeName}")
            .AppendLine($"Node ID: {config.NodeId}")
            .AppendLine($"Server: {config.ServerUrl}")
            .AppendLine($"Node version: {typeof(DiagnosticService).Assembly.GetName().Version}")
            .AppendLine($"OS: {Environment.OSVersion.VersionString}")
            .AppendLine($"Data root: {paths.RootDirectory}")
            .AppendLine($"ANSYS gate: {AnsysGateState()}");
        foreach (var adapter in adapters.All.OrderBy(
            item => item.Capability,
            StringComparer.Ordinal))
        {
            try
            {
                var runtime = adapter.DetectRuntime();
                builder.AppendLine()
                    .AppendLine($"Capability: {adapter.Capability}")
                    .AppendLine($"Adapter: {adapter.AdapterVersion}")
                    .AppendLine($"Software: {runtime.Software} {runtime.SoftwareVersion ?? "unknown"}")
                    .AppendLine($"Health: {runtime.Health}")
                    .AppendLine($"Detail: {runtime.Detail}")
                    .AppendLine($"Runtime: {adapter.RuntimePath}")
                    .AppendLine($"Contract: {adapter.ContractPath}")
                    .AppendLine($"Contract SHA-256: {adapter.ContractSha256}")
                    .AppendLine(
                        $"Workspace protocol: {(adapter.WorkspaceStateFilename is null ? "disabled" : "v1")}")
                    .AppendLine(
                        $"Workspace state: {adapter.WorkspaceStateFilename ?? "none"}");
            }
            catch (Exception exception) when (
                exception is IOException
                    or InvalidOperationException
                    or UnauthorizedAccessException)
            {
                builder.AppendLine()
                    .AppendLine($"Capability: {adapter.Capability}")
                    .AppendLine($"Adapter: {adapter.AdapterVersion}")
                    .AppendLine($"Diagnostic error: {exception.Message}");
            }
        }
        return builder.ToString();
    }

    private static string AnsysGateState() => Environment.GetEnvironmentVariable(
        "ZCBOT_ANSYS_242_VALIDATED",
        EnvironmentVariableTarget.Machine) == "1"
            ? "enabled"
            : "disabled";
}