using CaeGlobals;
using System;
using System.IO;
using System.Linq;
#pragma warning disable IDE0130

namespace CPSO.Commands
{
    [Serializable]
    public class CSaveToPmx : SaveCommand, IFileCommand
    {
        // Variables                                                                                                                
        private byte[] _hash;

        // Properties                                                                                                               
        public string FileName { get; }
        public byte[] Hash
        {
            get => _hash;
            set => _hash = value;
        }

        // Constructor                                                                                                              
        public CSaveToPmx(string fileName)
            : base("Save to file")
        {
            FileName = Tools.GetLocalPath(fileName);
            _hash = null;
        }


        // Methods                                                                                                                  
        private byte[] GetHash()
        {
            byte[] hash = null;
            string globalFileName = Tools.GetGlobalPath(FileName);
            //
            if (File.Exists(globalFileName))
            {
                using (FileStream fop = File.OpenRead(Tools.GetGlobalPath(FileName)))
                {
                    hash = System.Security.Cryptography.SHA1.Create().ComputeHash(fop);
                    string unused = BitConverter.ToString(hash);
                }
            }
            //
            return hash;
        }

        public bool IsFileHashUnchanged()
        {
            byte[] hash = GetHash();
            if (hash == null || _hash == null)
            {
                return false;
            }
            // ReSharper disable once RedundantIfElseBlock
            else
            {
                return hash.SequenceEqual(_hash);
            }
        }

        public override bool Execute(Controller receiver)
        {
            receiver.SaveToPmx(Tools.GetGlobalPath(FileName));
            //
            _hash = GetHash();
            //
            return true;
        }

        public override string GetCommandString()
        {
            return _dateCreated.ToString("MM/dd/yy HH:mm:ss") + "   " + "Model saved to file: " + FileName;
        }
    }
}