using SoftwareInstallationContracts.BindingModels;
using SoftwareInstallationContracts.SearchModels;
using SoftwareInstallationContracts.StoragesContracts;
using SoftwareInstallationContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoftwareInstallationFileImplement
{
    public class PackageStorage : IPackageStorage
    {
        private readonly DataFileSingleton source;

        public PackageStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public PackageViewModel? Delete(PackageBindingModel model)
        {
            var element = source.Packages.FirstOrDefault(x => x.Id == model.Id);

            if (element != null)
            {
                source.Packages.Remove(element);
                source.SavePackages();

                return element.GetViewModel;
            }

            return null;
        }

        public PackageViewModel? GetElement(PackageSearchModel model)
        {
            if (string.IsNullOrEmpty(model.PackageName) && !model.Id.HasValue)
            {
                return null;
            }

            return source.Packages.FirstOrDefault(x => (!string.IsNullOrEmpty(model.PackageName) && x.PackageName == model.PackageName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        public List<PackageViewModel> GetFilteredList(PackageSearchModel model)
        {
            if (string.IsNullOrEmpty(model.PackageName))
            {
                return new();
            }

            return source.Packages.Where(x => x.PackageName.Contains(model.PackageName)).Select(x => x.GetViewModel).ToList();
        }

        public List<PackageViewModel> GetFullList()
        {
            return source.Packages.Select(x => x.GetViewModel).ToList();
        }

        public PackageViewModel? Insert(PackageBindingModel model)
        {
            model.Id = source.Packages.Count > 0 ? source.Packages.Max(x => x.Id) + 1 : 1;
            var newPackage = Package.Create(model);

            if (newPackage == null)
            {
                return null;
            }

            source.Packages.Add(newPackage);
            source.SavePackages();

            return newPackage.GetViewModel;
        }

        public PackageViewModel? Update(PackageBindingModel model)
        {
            var package = source.Packages.FirstOrDefault(x => x.Id == model.Id);

            if (package == null)
            {
                return null;
            }

            package.Update(model);
            source.SavePackages();

            return package.GetViewModel;
        }
    }
}