using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;

namespace Hack.Xenosaga.Common
{
    public class Functions
    {
        public static void usage()
        {
            Trace.WriteLine("");
            Trace.WriteLine("xenosaga <option> <file> [encode/regroup]");
            Trace.WriteLine("  option   : -l = List files from index");
            Trace.WriteLine("             -u = Unpack files from index");
            Trace.WriteLine("             -p = Pack files from index");
            Trace.WriteLine("             -e = Extract text from file");
            Trace.WriteLine("             -i = Insert text from file");
            Trace.WriteLine("  file    : File to process (-l, -p, -u=Index file (the first one of each decade : xenosaga.00, xenosaga.10, xenosaga.20...) ; -e, -i : filename)");
            Trace.WriteLine("  encode  : (-e) Encoding of the output/input file (ANSI( default), ASCII, UTF8, UNICODE)");
            Trace.WriteLine("  regroup : (-p) true to pack all files in only one (ex: 11, 12, 13 in 11) ; false or empty (default) to keep the same system of increment files");
        }

        public static bool CheckArgs(string[] args, out Variables.stArgs listArgs)
        {
            listArgs = new Variables.stArgs();
            List<string> listActions = new List<string>() { "-l", "-p", "-u", "-e", "-i" };

            Trace.Write("Checking arguments : ");

            if (args.Length != 2 && args.Length != 3)
            {
                Trace.WriteLine("Incorrect number of parameter!");
                return false;
            }

            if (!listActions.Contains(args[0]))
            {
                Trace.WriteLine("Incorrect parameter - unknown <option>");
                return false;
            }

            if (!File.Exists(args[1]) && !Directory.Exists(args[1]))
            {
                Trace.WriteLine("Incorrect parameter - unknown <file>");
                return false;
            }

            if ((args.Length == 3 && args[0] == "-p") && (args[2] != "true" && args[2] != "false"))
            {
                Trace.WriteLine("Incorrect parameter - unknown <regroup>");
                return false;
            }
            if ((args.Length == 3 && (args[0] == "-e" || args[0] == "-i")) && (args[2] != "ANSI" && args[2] != "ASCII" && args[2] != "UTF8" && args[2] != "UNICODE"))
            {
                Trace.WriteLine("Incorrect parameter - unknown <encode>");
                return false;
            }

            listArgs.option = args[0];
            listArgs.filename = args[1];
            if (args.Length == 3 && listArgs.option == "-p")
                listArgs.regroup = args[2] == "true" ? true : false;
            listArgs.encode = args.Length == 2 ? Encoding.Default : null;
            if (args.Length == 3 && (listArgs.option == "-e" || listArgs.option == "-i"))
            {
                switch (args[2])
                {
                    case "ASCII":
                        listArgs.encode = Encoding.ASCII;
                        break;

                    case "UTF8":
                        listArgs.encode = Encoding.UTF8;
                        break;

                    case "UNICODE":
                        listArgs.encode = Encoding.Unicode;
                        break;

                    case "ANSI":
                    default:
                        listArgs.encode = Encoding.Default;
                        break;
                }
            }

            Trace.WriteLine("OK");

            return true;
        }
    }
}