using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Text.RegularExpressions;

namespace Cafe.AddWindows
{
    public partial class AddExchangeWindow : Window
    {
        public AddExchangeWindow()
        {
            InitializeComponent();
            EmployeeBox.ItemsSource = Connection.db.Users.Where(item => item.IDRole != 1).Select(item => item.Login).ToList();
        }

        private void DateTextChanged(object sender, TextChangedEventArgs e)
        {
            if (Regex.IsMatch((((TextBox)sender).Text).ToString(), "[^0-9.]"))
            {
                ((TextBox)sender).Text = ((TextBox)sender).Text.Remove(((TextBox)sender).Text.Length - 1);
                ((TextBox)sender).SelectionStart = ((TextBox)sender).Text.Length;
            }
        }

        private void TimeTextChanged(object sender, TextChangedEventArgs e)
        {
            if (Regex.IsMatch((((TextBox)sender).Text).ToString(), "[^0-9:]"))
            {
                ((TextBox)sender).Text = ((TextBox)sender).Text.Remove(((TextBox)sender).Text.Length - 1);
                ((TextBox)sender).SelectionStart = ((TextBox)sender).Text.Length;
            }
        }

        private void AddEmployeeClick(object sender, RoutedEventArgs e)
        {
            if (EmployeeBox.SelectedItem == null)
            {
                ErrorWindow errorWindow = new ErrorWindow("не выбрано работник");
                errorWindow.Show();
                return;
            }

            Users employee = Connection.db.Users.Where(item => item.Login == EmployeeBox.SelectedItem.ToString()).FirstOrDefault();

            EmployeeBox.SelectedItem = null;

            EmployeeBox.ItemsSource = Connection.db.Users.Where(item => item.Login != employee.Login && item.IDRole != 1).Select(item => item.Login).ToList();

            EmployeesList.Items.Add(employee);
        }

        private void SaveExchangeClick(object sender, RoutedEventArgs e)
        {
            List<Users> employees = new List<Users>();
            foreach (var item in EmployeesList.Items)
            {
                employees.Add((Users)item);
            }

            if (!ExchangeValidation(employees, Date.Text, TimeOfBegin.Text, TimeOfEnd.Text))
            {
                return;
            }

            DateTime.TryParse(Date.Text, out DateTime dateResult);
            TimeSpan.TryParse(TimeOfBegin.Text, out TimeSpan timeOfBeginResult);
            TimeSpan.TryParse(TimeOfEnd.Text, out TimeSpan timeOfEndResult);

            Exchange exchange = new Exchange()
            {
                Date = dateResult.Date,
                TimeOfBegin = timeOfBeginResult,
                TimeOfEnd = timeOfEndResult
            };

            Connection.db.Exchange.Add(exchange);
            Connection.db.SaveChanges();

            int idExchange = Connection.db.Exchange.Select(item => item.ID).ToList().Last();
            foreach (var item in EmployeesList.Items)
            {
                EmployeesExchanges employeesExchanges = new EmployeesExchanges()
                {
                    IDEmployee = ((Users)item).ID,
                    IDExchange = idExchange
                };

                Connection.db.EmployeesExchanges.Add(employeesExchanges);
                Connection.db.SaveChanges();
            }

            MainWindow mainWindow = new MainWindow();
            mainWindow.Show();
            this.Close();
        }

        public bool ExchangeValidation(List<Users> employees, string date, string timeOfBegin, string timeOfEnd)
        {
            if (employees == null)
            {
                ErrorWindow errorWindow = new ErrorWindow("не выбрано ни одного работника");
                errorWindow.Show();
                return false;
            }

            if (date == "" || timeOfBegin == "" || timeOfEnd == "")
            {
                ErrorWindow errorWindow = new ErrorWindow("не выбрано время");
                errorWindow.Show();
                return false;
            }

            TimeValidation(timeOfBegin);
            if (!TimeValidation(timeOfBegin))
            {
                return false;
            }
            TimeSpan.TryParse(timeOfBegin, out TimeSpan timeOfBeginResult);

            TimeValidation(timeOfEnd);
            if (!TimeValidation(timeOfEnd))
            {
                return false;
            }
            TimeSpan.TryParse(timeOfEnd, out TimeSpan timeOfEndResult);

            DateValidation(date);
            if (!DateValidation(date))
            {
                return false;
            }
            DateTime.TryParse(date, out DateTime dateResult);

            List<Exchange> allExchangesOnDate = Connection.db.Exchange.Where(item => item.Date == dateResult).ToList();

            if (allExchangesOnDate.Exists(item => (item.TimeOfBegin <= timeOfBeginResult && item.TimeOfEnd >= timeOfBeginResult)
                                                   || (item.TimeOfBegin <= timeOfEndResult && item.TimeOfEnd >= timeOfEndResult)))
            {
                ErrorWindow errorWindow = new ErrorWindow("на это время уже запланирована смена");
                errorWindow.Show();
                return false;
            }

            if (dateResult.Date - DateTime.Now.Date > new TimeSpan(5, 0, 0, 0))
            {
                ErrorWindow errorWindow = new ErrorWindow("можно сформировать рассписание тольок на 5 дней вперёд");
                errorWindow.Show();
                return false;
            }

            return true;
        }

        public bool TimeValidation(string time)
        {
            TimeSpan timeResult;
            if (!TimeSpan.TryParse(time, out timeResult) || time.Count(item => item == ':') != 1)
            {
                ErrorWindow errorWindow = new ErrorWindow("неверно указано время");
                errorWindow.Show();
                return false;
            }

            return true;
        }

        public bool DateValidation(string date)
        {
            DateTime dateResult;
            if (!DateTime.TryParse(date, out dateResult) || date.Count(item => item == '.') != 2)
            {
                ErrorWindow errorWindow = new ErrorWindow("неверно указана дата");
                errorWindow.Show();
                return false;
            }

            return true;
        }

        private void BackButtonClick(object sender, RoutedEventArgs e)
        {
            MainWindow mainWindow = new MainWindow();
            mainWindow.Show();
            this.Close();
        }
    }
}