using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CarManagerV3.Manager;

namespace CarManagerV3.Classes
{
    internal class FileMeta
    {
        private string version;
        private DateTime lastModified;

        public string Version { get { return version; } set { version = value; } }
        public DateTime LastModified { get { return lastModified; } }

        public FileMeta(string version)
        {
            this.version = version;
            this.lastModified = DateTime.Now;
        }

        public static FileMeta FromCSV(string csv)
        {
            string[] parts = csv.Split(';');
            if (parts.Length < 3)
            {
                throw new FormatException("CSV format is incorrect. Expected format: product;version;lastModified");
            }
            return new FileMeta(parts[1]) { lastModified = DateTime.Parse(parts[2]) };
        }

        public static FileMeta Generate()
        {
            string version = Updater.GetCurrentVersion();
            return new FileMeta(version);
        }

        public static bool IsFileMeta(string csv)
        {
            return csv.StartsWith("CarManager3;");
        }

        public static bool IsOlderVersion(FileMeta meta)
        {
            string version = Updater.GetCurrentVersion();
            return Updater.IsNewerVersion(version, meta.Version);
        }

        public static bool NeedsUpdate(FileMeta meta)
        {
            string version = Updater.GetCurrentVersion();
            return Updater.IsNewerVersion(version, meta.Version) && FileUpdate.GetRequiredUpdates(meta.Version).Count > 0;
        }

        public void Modify()
        {
            lastModified = DateTime.Now;
        }

        public string ToCSV()
        {
            return $"CarManager3;{version};{lastModified}";
        }

        public override string ToString()
        {
            return $"File Version: {version}, Last Modified: {lastModified}";
        }


    }
}