using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media.Animation;

namespace WpfApp15
{
    public partial class MainWindow : Window
    {
        public class CustomerEntity
        {
            public int ID { get; set; }
            public string CustomerName { get; set; }
            public string CustomerTel { get; set; }
            public List<CustomerEntity> GetCustomer() {
                // Simulate long running processing.
                Thread.Sleep(5000);
                var model = new List<CustomerEntity>
                {
            new CustomerEntity {ID = 1,CustomerName = "AAAA", CustomerTel = "09125484848"},
            new CustomerEntity {ID = 2,CustomerName = "BBBBB", CustomerTel = "09125486708"},
            };
                return model;
            }
        }
        public MainWindow() {
            InitializeComponent();
        }
        private Storyboard GetStoryboard() {
            return TryFindResource("RotationBtn") as Storyboard;
        }
        private void StartAnimation(Storyboard storyboard) {
            Storyboard.SetTarget(storyboard, Command4);
            storyboard.Begin();
        }
        private void StopAnimation(Storyboard storyboard) {
            storyboard.Stop();
        }
        private async void Command4_Click(object sender, RoutedEventArgs e) {
            // Get text from the TextBox here in the main thread.
            var myText = MyTextBox.Text;
            // Check text here, because there is no sense to start animation and "DoMyCodes" when it's not valid.
            // It also makes more sense to show MessageBox here.
            if (string.IsNullOrEmpty(myText)) {
                MessageBox.Show("please enter valid parameter");
            } else {
                // Get storyboard and start animation.
                var storyboard = GetStoryboard();
                StartAnimation(storyboard);
                // Get customers.
                var customers = await DoMyCodesAsync(myText);
                // TODO: Process result here.
                // Stop animation.
                StopAnimation(storyboard);
            }
        }
        private async Task<IEnumerable<CustomerEntity>> DoMyCodesAsync(string myText) {
            // 1) More correct approach:
            //
            // "GetCustomer()" method should be async, and it should also use async methods to get customers from the DB, network, or other source.
            // CustomerEntity C = new CustomerEntity();
            // var AllData = await C.GetCustomerAsync();
            // var result = AllData.Select(e => e.CustomerName.Contains("xxxx")).Select(s => s).First();
            // var CompantNames = AllData.Where(s => s.ID > 1)
            //              .Select(s => s)
            //              .Where(st => st.CustomerName.Contains("xxxx"));
            // return CompantNames;
            //
            // 2) Another approach:
            //
            // If from whatever reason you can't make "GetCustomers" async, then you can create a new task here and invoke it as-is.
            return await Task.Run(() => {
                CustomerEntity C = new CustomerEntity();
                var AllData = C.GetCustomer();
                var CompantNames = AllData.Where(s => s.ID > 1)
                                .Select(s => s)
                                .Where(st => st.CustomerName.Contains(myText));
                return CompantNames;
            });
        }
    }
}