using System.Diagnostics;

namespace Controllers.Processes {
    
    public class PyProcess {

        public static (bool, string) RunPythonProcess(string PyExecutable, string PyScript, bool returns = false, string PyArgs = "") {
            var start = new ProcessStartInfo {
                FileName = PyExecutable,
                Arguments = $"-u {PyScript} {PyArgs}",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            };

            using (Process? process = Process.Start(start)) {

                // Try to start the process
                if (process == null) {
                    return (false, "Failed to start the process");
                }

                // Read the stdouts and wait for process to end
                string result = process.StandardOutput.ReadToEnd();
                string errors = process.StandardError.ReadToEnd();
                process.WaitForExit();

                // If the process Errored
                if (process.ExitCode != 0) {
                    return (false, $"Python Error : {errors}");
                }

                // If the process is supposed to return
                if (returns) {
                    string markerStart = "---RESULT_START---";
                    string markerEnd = "---RESULT_END---";

                    int startPos = result.IndexOf(markerStart) + markerStart.Length;
                    int endPos = result.IndexOf(markerEnd);

                    if (startPos > -1 && endPos > startPos) {
                        string cleanResult = result.Substring(startPos, endPos - startPos).Trim();
                        return (true, cleanResult);
                    }
                } else {
                    return (true, "");
                }

                // Fail Safe
                return (false, "Result not found");
            }
        }

    }

}