using BWapp.Config;
using BWapp.Model;
using BWapp.Services;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace BWapp.ViewModels
{
    public class AddAuctionViewModel : ViewModelBase
    {
        INavigationService _navigationService;
        IDbService _dbService;
        IAuctionService _auctionService;
        bool _isEditing;

        public AddAuctionViewModel(INavigationService navigationService, IDbService dbService, IAuctionService auctionService)
        {
            _navigationService = navigationService;
            _dbService = dbService;
            _auctionService = auctionService;
            Init(_auctionService.SelectedAuction);
            _auctionService.OnSelectedAuctionChanged += _auctionService_OnSelectedAuctionChanged;
        }

        private void _auctionService_OnSelectedAuctionChanged(object sender, AuctionItem e)
        {
            Device.BeginInvokeOnMainThread(() => Init(e));
        }

        void Init(AuctionItem auction)
        {
            if (auction is AuctionItem auctionItem)
            {
                _isEditing = true;
                AuctionItem = auctionItem;

                if (DateTime.Now < AuctionItem.Date)
                {
                    Today = DateTime.Now;
                    Time = AuctionItem.Date.TimeOfDay;
                }
                else
                {
                    Today = AuctionItem.Date;
                    Time = Today.TimeOfDay;
                }
            }
            else
            {
                _isEditing = false;
                AuctionItem = new AuctionItem();
            }
        }

        public void OnViewAppearing()
        {
            if (!_isEditing)
            {
                AuctionItem = new AuctionItem();
                Today = DateTime.Now;
                Time = DateTime.Now.TimeOfDay;
            }
        }

        public void OnViewDisappearing()
        {
            AuctionItem = null;
        }

        public RelayCommand SaveAuction => new RelayCommand(async () =>
        {
            //Combination Date with Time
            //AuctionItem.Date=Date
            AuctionItem.Date = AuctionItem.Date.Add(Time);

            //Check input values
            if (AuctionItem.Name != null && AuctionItem.Date >= Today)
            {
                AuctionItem.DateString = AuctionItem.Date.ToString("yyyy-MM-dd HH:mm:ss");
                AuctionItem.BackgroundColor = ColorGenerator.GenerateRandomPleasingColor();
                _dbService.SaveAuction(AuctionItem);
                await _navigationService.GoBack();
            }
            //Show alfert when values are empty or datetime is wrong
            else
            {
                if (AuctionItem.Name == null)
                {
                    await App.Current.MainPage.DisplayAlert("Puste pole", "Nie podałeś nazwy", "Ok");
                }
                else
                {
                    await App.Current.MainPage.DisplayAlert("Zła godzina", "Ustawiłeś czas przeszły.\nPodaj aktualną godzinę aukcji.", "Ok");
                }
            }
        });

        //Property for AuctionItem to save to Database
        private AuctionItem _auctionItem;
        public AuctionItem AuctionItem
        {
            get
            {
                return _auctionItem;
            }
            set
            {
                _auctionItem = value;
                RaisePropertyChanged(nameof(AuctionItem));
            }
        }

        //Return current DATE in format from BW_Auctions for Placeholder
        private DateTime _today { get; set; }
        public DateTime Today
        {
            get { return _today; }
            set
            {
                _today = value;
                RaisePropertyChanged(nameof(Today));
            }
        }
        //Return current TIME in format from BW_Auctions for Placeholder
        private TimeSpan _time { get; set; }
        public TimeSpan Time
        {
            get { return _time; }
            set
            {
                _time = value;
                RaisePropertyChanged(nameof(Time));
            }
        }

    }
}