// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright (C) 2026 Karim Gabriele Varano
using System;
using System.IO;
using Rhino;

namespace DOSSIER;

/// <summary>
/// Geteilter Python-Script-Runner fuer Plugin-Startup (startup.py) und
/// Commands (cmd/*.py). Primaer ueber Rhino.Runtime.Code-API (CPython3),
/// Fallback ueber _-RunPythonScript-Command.
/// </summary>
internal static class PythonRunner
{
    /// <summary>Fuehrt das Script aus. Versucht RhinoCode-API zuerst,
    /// faellt auf _-RunPythonScript zurueck. Labels nur fuer Logs.</summary>
    public static bool Run(string scriptPath, string label)
    {
        if (!File.Exists(scriptPath))
        {
            RhinoApp.WriteLine($"[DOSSIER] {label}: Script nicht gefunden: {scriptPath}");
            return false;
        }
        if (TryRunViaRhinoCode(scriptPath, label)) return true;
        try
        {
            RhinoApp.RunScript($"_-RunPythonScript \"{scriptPath}\"", echo: false);
            return true;
        }
        catch (Exception ex)
        {
            RhinoApp.WriteLine($"[DOSSIER] {label} RunScript: {ex.Message}");
            return false;
        }
    }

    /// <summary>Wie Run, aber defern auf das naechste Idle-Event.
    /// Erlaubt safe Invocation aus Plugin-OnLoad oder Command-RunCommand
    /// (Rhino mag kein direktes _-RunPythonScript aus diesen Kontexten).</summary>
    public static void RunDeferred(string scriptPath, string label)
    {
        EventHandler? handler = null;
        handler = (sender, e) =>
        {
            RhinoApp.Idle -= handler;
            Run(scriptPath, label);
        };
        RhinoApp.Idle += handler;
    }

    private static bool TryRunViaRhinoCode(string scriptPath, string label)
    {
        try
        {
            var spec = new Rhino.Runtime.Code.Languages.LanguageSpec("*.*.python", "3.*");
            var lang = Rhino.Runtime.Code.RhinoCode.Languages.QueryLatest(spec);
            if (lang == null) return false;

            // RhinoCode.CreateCode(text) setzt __file__/sys.path NICHT automatisch
            // — die DOSSIER-Scripts erwarten beides. Injizieren vorne rein.
            var pathLit = scriptPath.Replace("\\", "/");
            var preamble =
                "import sys, os\n" +
                $"__file__ = r'{pathLit}'\n" +
                "sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))\n" +
                "sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))\n";
            var code = lang.CreateCode(preamble + File.ReadAllText(scriptPath));
            var ctx = new Rhino.Runtime.Code.Execution.RunContext();
            code.Run(ctx);
            return true;
        }
        catch (Exception ex)
        {
            RhinoApp.WriteLine($"[DOSSIER] {label} RhinoCode: {ex.Message}");
            return false;
        }
    }
}