using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace eCompanies
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public delegate void UpdateCompanyGridDelegate(Company updatingCompany);
    public partial class MainWindow : Window
    {
        UsersWindow usersWindowInstance = null;

        public MainWindow()
        {
            InitializeComponent();
            companyGrid.DataContext = App.getCompanies();
        }
        
        internal static void refreshDataGrid(DataGrid dg)
        {
            dg.CancelEdit();
            dg.Items.Refresh();
        }

        private void updateCompanyItem(Company updatingCompany)
        {
            if (updatingCompany == null) return;
            var c = ((DataGrid)companyGrid).DataContext as ObservableCollection<Company>;
            for (int i = 0; i != c.Count(); i++)
                if (c[i].CompanyId.Equals(updatingCompany.CompanyId))
                    c[i] = updatingCompany;
            refreshDataGrid(companyGrid);
        }

        private void companyGrid_AddingNewItem(object sender, AddingNewItemEventArgs e)
        {
            e.NewItem = new Company();
            var newItem = e.NewItem as Company;
            newItem.dataGridRowStatus = DataGridRowStatus.NEW;
            var c = ((DataGrid)sender).DataContext as ObservableCollection<Company>;
            if (c.Count != 0)
                newItem.CompanyId = c[c.Count - 1].CompanyId + 1;
        }

        private void companyGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
        {
            var context = e.Row.DataContext as Company;
            if (context.dataGridRowStatus != DataGridRowStatus.NEW)
                context.dataGridRowStatus = DataGridRowStatus.UPDATED;
        }

        private void RowEdit_Click(object sender, RoutedEventArgs e)
        {
            UpdateCompanyGridDelegate d = updateCompanyItem;
            Company company = (Company)companyGrid.CurrentItem;
            if (usersWindowInstance != null) usersWindowInstance.Close();
            usersWindowInstance = new UsersWindow(company, d);
            usersWindowInstance.Show();
        }

        private void RowDelete_Click(object sender, RoutedEventArgs e)
        {
            Company c = (Company)companyGrid.SelectedItem;
            c.dataGridRowStatus = DataGridRowStatus.REMOVED;
            refreshDataGrid(companyGrid);
        }


        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            switch (App.saveResultsMsgBox())
            {
                case MessageBoxResult.No: return;
                case MessageBoxResult.Cancel: e.Cancel = true; return;
            }
            foreach (Company c in (ObservableCollection<Company>)companyGrid.DataContext)
            {
                if ((c.Name == null) && (c.dataGridRowStatus != DataGridRowStatus.REMOVED))
                    switch (App.fieldHasNotFilled())
                    {
                        case MessageBoxResult.No: return;
                        case MessageBoxResult.Yes: e.Cancel = true; return;
                    }
                switch (c.dataGridRowStatus)
                {
                    case DataGridRowStatus.REMOVED:
                        App.removeCompany(c.CompanyId);
                        syncUsers(c);
                        break;
                    case DataGridRowStatus.NEW:
                        App.addCompany(c);
                        syncUsers(c);
                        break;
                    case DataGridRowStatus.UPDATED:
                        App.updateCompany(c);
                        syncUsers(c);
                        break;
                }
            }
        }

        private void syncUsers(Company c)
        {
            foreach (Users u in c.Users)
            {
                switch (u.dataGridRowStatus)
                {
                    case DataGridRowStatus.REMOVED:
                        App.removeUser(u.UserId);
                        break;
                }
            }
        }
    }
}