using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using com.sun.tools.javac.util;
using Comal.Classes;
using InABox.Clients;
using InABox.Core;
using InABox.Wpf;
using javax.swing;

namespace PRSDesktop
{
    /// <summary>
    /// Interaction logic for JobRequisitionStockSelectionPage.xaml
    /// </summary>
    public partial class JobRequisitionStockSelectionPage : ThemableWindow
    {
        ObservableCollection<JobRequistionStockSelectionViewModel> ViewModels = new ObservableCollection<JobRequistionStockSelectionViewModel>();
        JobRequisitionItem Item = new JobRequisitionItem();
        public Guid EmpID { get; set; }
        public Guid IssuingJobID { get; set; }
        public bool Requisitioned = false;
        public JobRequisitionStockSelectionPage(IEnumerable<StockHolding> holdings, JobRequisitionItem item, Job issuingJob, bool requisitioned = false)
        {
            InitializeComponent();

            Item = item;
            IssuingJobID = issuingJob.ID;
            jobLbl.Text = "Taking stock from Job: " +  issuingJob.Name + " (" + issuingJob.JobNumber + ")";
            foreach (var holding in holdings)
            {
                ViewModels.Add(new JobRequistionStockSelectionViewModel
                {
                    Location = holding.Location.Description,
                    Units = holding.Units,
                    Style = holding.Style.Description,
                    Holding = holding,
                });
            }
            listView.ItemsSource = ViewModels;

            Task.Run(() =>
            {
                EmpID = new Client<Employee>().Query(new Filter<Employee>(x => x.UserLink.ID).IsEqualTo(ClientFactory.UserGuid), new Columns<Employee>(x => x.ID)).Rows.FirstOrDefault().Get<Employee, Guid>(x => x.ID);
            });

            if(requisitioned) 
            {
                availableUnitsLbl.Text = "Requisitioned";
                listView.IsEnabled = false;
                okButton.IsEnabled = false;
            }
        }

        private void SaveButton_Click(object sender, RoutedEventArgs e)
        {
            var models = ViewModels.Where(x => x.ChosenUnits > 0);

            foreach (var model in models)
                CreateStockMovements(model);

            DialogResult = true;
        }

        private void CreateStockMovements(JobRequistionStockSelectionViewModel model)
        {
            StockMovementBatch batch = new StockMovementBatch();
            batch.TimeStamp = DateTime.Now;
            batch.Type = StockMovementBatchType.Transfer;
            batch.Notes = "Requisitioned for Job " + Item.Job.JobNumber;
            new Client<StockMovementBatch>().Save(batch, "Created for requisitioning stock");

            var issuing = CreateBaseMovement(model, batch.ID);
            issuing.Job.ID = IssuingJobID;
            issuing.Issued = model.ChosenUnits;

            var receiving = CreateBaseMovement(model, batch.ID);
            receiving.Job.ID = Item.Job.ID;
            receiving.Received = model.ChosenUnits;
            receiving.JobRequisitionItem.ID = Item.ID;

            new Client<StockMovement>().Save(new StockMovement[] { issuing, receiving }, "Created from Job Requisition Stock Reserve Screen");
        }

        private StockMovement CreateBaseMovement(JobRequistionStockSelectionViewModel model, Guid batchid)
        {
            StockMovement mvt = new StockMovement();
            mvt.Style.ID = model.Holding.Style.ID;
            mvt.Location.ID = model.Holding.Location.ID;
            mvt.Dimensions.CopyFrom(model.Holding.Dimensions);
            mvt.Batch.ID = batchid;
            mvt.Employee.ID = EmpID;
            mvt.IsTransfer = true;
            mvt.Date = DateTime.Now;
            mvt.Product.ID = Item.Product.ID;

            return mvt;
        }

        private void Cancel_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = false;
        }

        private void TextBox_TextChanged(object sender, System.Windows.Controls.TextChangedEventArgs e)
        {
            var box = sender as TextBox;
            if (!string.IsNullOrWhiteSpace(box.Text))
            {
                if (double.TryParse(box.Text, out double value) == false)
                    box.Text = "0";

                else
                {
                    var holdingUnits = (box.DataContext as JobRequistionStockSelectionViewModel).Holding.Units;

                    if (holdingUnits >= value && value >= 0)
                        (box.DataContext as JobRequistionStockSelectionViewModel).ChosenUnits = value;
                    else
                        (box.DataContext as JobRequistionStockSelectionViewModel).ChosenUnits = holdingUnits;

                }

            }
        }

        private void All_Clicked(object sender, RoutedEventArgs e)
        {
            var holdingUnits = ((sender as Button).DataContext as JobRequistionStockSelectionViewModel).Holding.Units;
            ((sender as Button).DataContext as JobRequistionStockSelectionViewModel).ChosenUnits = holdingUnits;
        }

        private void Minus_Click(object sender, RoutedEventArgs e)
        {
            var model = (sender as Button).DataContext as JobRequistionStockSelectionViewModel;

            if (model.ChosenUnits > 0)
                model.ChosenUnits--;
        }

        private void Plus_Click(object sender, RoutedEventArgs e)
        {
            var holdingUnits = ((sender as Button).DataContext as JobRequistionStockSelectionViewModel).Holding.Units;
            var model = (sender as Button).DataContext as JobRequistionStockSelectionViewModel;
            if (model.ChosenUnits < holdingUnits)
                model.ChosenUnits++;
        }
    }

    public class JobRequistionStockSelectionViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;
        public string Location { get; set; }
        public string Style { get; set; }
        public double Units { get; set; }

        private double chosenUnits;
        public double ChosenUnits
        {
            get => chosenUnits;
            set
            {
                chosenUnits = value;
                OnPropertyChanged("ChosenUnits");
            }
        }
        public StockHolding Holding { get; set; }

        public JobRequistionStockSelectionViewModel()
        {
            Location = "";
            Style = "";
            Units = 0;
            ChosenUnits = 0;
        }

        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}