using System.Diagnostics;

namespace crusherScanner
{
    /// <summary>
    /// Log file handler.
    /// </summary>
    internal static class Logging
    {

        private static string logFile = "";
        private static readonly string LocalLogDir = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\crusherScanner";

        /// <summary>
        /// Create/Append the current log file.
        /// </summary>
        /// <param name="message">Message to be written into the log file.</param>
        /// <returns></returns>
        public static bool Append(string message)
        {
            var dt = DateTime.Now;
            if (!Directory.Exists(LocalLogDir))
            {
                try
                {
                    Directory.CreateDirectory(LocalLogDir);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Error in logging!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return false;
                }
            }

            // if no log file for this instance create one
            if (logFile == "")
            {
                logFile = dt.ToString("yyyyMMdd") + "-0.log";
                for (int i = 1; i < 100; i++)
                {
                    // if an old log file is detected create a new one for this instance.
                    if (File.Exists(LocalLogDir + "\\" + logFile))
                    {
                        logFile = dt.ToString("yyyyMMdd") + "-" + i + ".log";
                    }
                    else
                    {
                        break;
                    }
                }
            }

            try
            {

                File.AppendAllText(LocalLogDir + "\\" + logFile, dt.ToString("yyyyMMddTHHmmss") + "---" + message + "\n");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error in logging!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }
            return true;
        }

        /// <summary>
        /// Open the current log file in the system default text editor.
        /// </summary>
        public static void OpenInTextEditor()
        {
            StartProcess(LocalLogDir + "\\" + logFile);
        }

        /// <summary>
        /// Open the directroy that contains the log files.
        /// </summary>
        public static void OpenLogDirectory()
        {
            StartProcess(LocalLogDir);
        }

        /// <summary>
        /// Remove all log files from the log directory.
        /// </summary>
        public static void PurgeLogs()
        {
            DialogResult result = MessageBox.Show("Are you sure you want to delete ALL logs?", "Purge Logs", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation);
            if (result == DialogResult.Yes)
            {
                var logs = Directory.EnumerateFiles(LocalLogDir, "*-*.log");
                foreach (var log in logs)
                {
                    File.Delete(log);
                }
            }
        }

        /// <summary>
        /// Pass a location or file to the operating system to open.
        /// </summary>
        /// <param name="target">Location or file to open.</param>
        private static void StartProcess(string target)
        {
            new Process
            {
                StartInfo = new ProcessStartInfo(target)
                {
                    UseShellExecute = true
                }
            }.Start();
        }

    }
}