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

namespace poc_binary
{
    class Unit
    {

        /// <summary>
        /// Name is the name of the unit this instance represents.
        /// </summary>
        public string Name = "";

        /// <summary>
        /// The name of the faction this Unit belongs to
        /// </summary>
        public string Faction = "";

        /// <summary>
        /// Dynamic array for this Unit instances' unit options
        /// </summary>
        public List<string> Options = new List<string>();

        /// <summary>
        /// Dynamic array for this Unit instances' something eles
        /// </summary>
        public List<string> SomeOptions = new List<string>();

        public Unit(string sPath)
        {
            try
            {
                FileStream fs = File.Open(sPath, FileMode.Open);

                BinaryReader br = new BinaryReader(fs);

                // Read string reads a 7 bit encoded int which represents the length of the following string
                // and then reads that many characters.
                this.Name = br.ReadString();
                this.Faction = br.ReadString();

                // When saving this we wrote a 32 bit (int) to file, which represented the amount of entries in the dynamic array (list)
                int iCount = br.ReadInt32();

                // We now read iCount strings from the file
                for (int i = 0; i < iCount; i++)
                {
                    this.Options.Add(br.ReadString());
                }

                // Do the same for SomeOptions (placeholder)
                iCount = br.ReadInt32();

                // We now read iCount strings from the file
                for (int i = 0; i < iCount; i++)
                {
                    this.SomeOptions.Add(br.ReadString());
                }

                // Cleanup
                br.Close();
                fs.Close();
            }
            catch (IOException e)
            {
                // Replace with whatever output stream you want to use, for example message boxes.
                Console.WriteLine("An error occured whilst trying to read " + sPath + " : " + e);
            }
        }

        /// <summary>
        /// Saves the unit's information to disk.
        /// </summary>
        public void Save(string sPath)
        {
            try
            {
                FileStream fs = File.Open(sPath, FileMode.OpenOrCreate);

                BinaryWriter bw = new BinaryWriter(fs);

                // Write the name and faction 
                bw.Write(this.Name);
                bw.Write(this.Faction);

                // Write the amount of entries in Options
                bw.Write(this.Options.Count);

                // Write each string in options
                for (int i = 0; i < this.Options.Count; i++)
                {
                    bw.Write(this.Options[i]);
                }

                // Do the same for SomeOptions
                bw.Write(this.SomeOptions.Count);

                for (int i = 0; i < this.SomeOptions.Count; i++)
                {
                    bw.Write(this.SomeOptions[i]);
                }

            }
            catch (IOException e)
            {
                // Replace with whatever output stream you want to use, for example message boxes.
                Console.WriteLine("An error occured whilst trying to write " + sPath + " : " + e);
            }
        }

    }
}