using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NX_Installation
{
    class GetTransferParameters
    {
        private string FileName { set; get; }

        public GetTransferParameters(string filename)
        {
            FileName = filename;
        }

        /// <summary>
        /// Delivers the transfer parameters in a string array
        /// </summary>
        /// <param name="arrayNumber">Maximum numbers of values you want to get.</param>
        /// <returns></returns>
        public string[] GetTransferParameter(int arrayNumber)
        {
            Logfile log = new Logfile(FileName);
            log.Info("Determine transfer parameters");

            int arrayLenght = ArrayLenght();

            string[] allParameter = new string[arrayLenght];
            allParameter = ReadTransferParameter();

            foreach (String s in allParameter) //Werte in die Logdatei schreiben
            {
                log.Info("Determined transfer parameters: " + s);
            }

            return ShortenPathParameter(allParameter, arrayNumber);
        }

        private string[] ReadTransferParameter()
        {
            return Environment.GetCommandLineArgs();
        }

        private string[] ShortenPathParameter(string[] allParameter, int arrayNumber)
        {
            //Den ersten Parameter (= Dateipfad) ausfiltern
            int arrayLenght = allParameter.Length - 1;
            if (arrayLenght > arrayNumber) arrayLenght = arrayNumber;
            string[] parameter = new string[arrayLenght];
            for (int i = 0; i < arrayLenght; i++)
            {
                parameter[i] = allParameter[i + 1];
            }

            return parameter;
        }

        /// <summary>
        /// Returns the lenght of an Array
        /// </summary>
        /// <returns></returns>
        public int ArrayLenght()
        {
            return ReadTransferParameter().Length;
        }

        /// <summary>
        /// Check whether a arrayfield is empty
        /// </summary>
        /// <param name="transferParameter">Array you want to evaluate</param>
        /// <param name="maxArrayLenght">Maximum array count</param>
        /// <returns></returns>
        public bool ParametersAreEmpty(string[] transferParameter, int maxArrayLenght)
        {
            Logfile log = new Logfile(FileName);
            log.Info("Check whether transfer parameters are valid");
            bool empty = false;
            if (transferParameter.Length < maxArrayLenght) return empty = true;

            for (int i = 0; i < maxArrayLenght; i++)
            {
                if (transferParameter[i] == "") empty = true;
            }
            if (empty)
            {
                log.Warn("Transfer parameter is empty");
            }
            else
            {
                log.Info("Transfer parameter has a value");
            }
            return empty;
        }
    }
}