/*
    Copyright (c) 2017 Marcin Szeniak (https://github.com/Klocman/)
    Apache License Version 2.0
*/

using System.Diagnostics;
using System.IO;
using Klocman.Tools;

namespace UninstallTools.Startup
{
    public abstract class StartupEntryBase
    {
        /// <summary>
        ///     Command executed by the startup entry
        /// </summary>
        public virtual string Command { get; protected set; }

        /// <summary>
        ///     Full path to the executable pointed by the startup entry
        /// </summary>
        public virtual string CommandFilePath { get; protected set; }

        /// <summary>
        ///     Company info extracted from the target executable (if possible)
        /// </summary>
        public virtual string Company { get; protected set; }

        /// <summary>
        ///     True if the entry is not processed during startup.
        ///     It is stored in the backup reg key and optionally backup directory if it's a link file.
        /// </summary>
        public abstract bool Disabled { get; set; }

        /// <summary>
        ///     Name of the called program extracted from the link or the target executable (if possible)
        /// </summary>
        public virtual string ProgramName { get; protected set; }

        /// <summary>
        ///     Program name without version info and such
        /// </summary>
        public virtual string ProgramNameTrimmed { get; protected set; }

        /// <summary>
        ///     Custom name of the parent location
        /// </summary>
        public virtual string ParentShortName { get; protected set; }

        /// <summary>
        ///     Full name of the parent location
        /// </summary>
        public virtual string ParentLongName { get; protected set; }

        /// <summary>
        ///     Full name of the entry
        /// </summary>
        public virtual string EntryLongName { get; protected set; }

        /// <summary>
        ///     Combined ParentLongName and EntryLongName
        /// </summary>
        public virtual string FullLongName => ParentLongName != null && EntryLongName != null
            ? PathTools.GenerousCombine(ParentLongName, EntryLongName)
            : null;

        /// <summary>
        ///     Delete this startup entry from the system
        /// </summary>
        public abstract void Delete();

        /// <summary>
        ///     Check if this entry still exists in the system
        /// </summary>
        public abstract bool StillExists();

        /// <summary>
        ///     $"{ProgramName} | {Company} | {Command}"
        /// </summary>
        public virtual string ToLongString()
        {
            return $"{ProgramName} | {Company} | {Command}";
        }

        /// <summary>
        ///     Create beckup of this entry in specified folder
        /// </summary>
        public abstract void CreateBackup(string backupPath);

        /// <summary>
        ///     Returns FullLongName, unless it's empty. In that case returns ProgramName, or Command if that is empty too.
        /// </summary>
        public override string ToString()
        {
            return FullLongName ?? ProgramName ?? Command;
        }

        protected static string ProcessCommandString(string command)
        {
            if (string.IsNullOrEmpty(command))
                return null;

            return ProcessStartCommand.TryParse(command, out var temp) ? temp.FileName : null;
        }

        /// <summary>
        ///     Fill in fields with version information from specified file
        /// </summary>
        protected void FillInformationFromFile(string commandFilename)
        {
            if (!File.Exists(commandFilename))
                return;

            try
            {
                var info = FileVersionInfo.GetVersionInfo(commandFilename);
                Company = info.CompanyName;

                var fileDesc = StringTools.StripStringFromVersionNumber(info.FileDescription);
                if (!string.IsNullOrEmpty(fileDesc))
                    ProgramNameTrimmed = fileDesc;
                else
                    ProgramNameTrimmed = !string.IsNullOrEmpty(info.ProductName)
                        ? info.ProductName
                        : StringTools.StripStringFromVersionNumber(ProgramName);
            }
            catch
            {
                // Ignore file access errors errors
            }
        }
    }
}