using AddressBook_MVVMSampleV2.Interface;
using AddressBook_MVVMSampleV2.Model;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Reactive;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;

namespace AddressBook_MVVMSampleV2.ViewModel
{
    public class MainViewModel : ReactiveObject
    {
        public ObservableCollection<Person> Persons { get; set; }

        public ICommand AddCommand { get; set; }
        public ICommand DeleteCommand { get; set; }
        public ICommand ModifyCommand { get; set; }
        public ICommand ExitCommand { get; set; }

        private readonly IMessageBoxService MessageBoxService;
        private readonly Func<Person, AddViewModel.ViewType, IDialogView> CreateAddView;

        public MainViewModel() : this(null, null)
        {
            
        }

        public MainViewModel(IMessageBoxService messageBoxService, Func<Person, AddViewModel.ViewType, IDialogView> createAddView)
        {
            this.MessageBoxService = messageBoxService;
            this.CreateAddView = createAddView;

            this.Persons = new ObservableCollection<Person>();

            InitInstance();
        }

        private void InitInstance()
        {
            // Init Commands
            this.AddCommand = ReactiveCommand.Create<Unit>(CommandAdd);
            this.ModifyCommand = ReactiveCommand.Create<int, Unit>(index => CommandModify(index));
            this.DeleteCommand = ReactiveCommand.Create<int, Unit>(index => CommandDelete(index));
            this.ExitCommand = ReactiveCommand.Create<IWindowView, Unit>(view => CommandExit(view));

            // Init Default Data
            this.Persons.Add(new Person() { Name = "Kim", Gender = true, PhoneNumber = "123-4567", Address = "KOR" });
            this.Persons.Add(new Person() { Name = "Max", Gender = true, PhoneNumber = "123-4567", Address = "USA" });
            this.Persons.Add(new Person() { Name = "John", Gender = true, PhoneNumber = "123-4567", Address = "UK" });
            this.Persons.Add(new Person() { Name = "Richard", Gender = true, PhoneNumber = "123-4567", Address = "UK" });
            this.Persons.Add(new Person() { Name = "Shinoda", Gender = true, PhoneNumber = "123-4567", Address = "JPN" });
        }

        private Unit CommandAdd()
        {
            Person addData = new Person();
            IDialogView view = this.CreateAddView(addData, AddViewModel.ViewType.Add);
            if (view.ShowDialog() != true)
                return Unit.Default;

            this.Persons.Add(addData);
            return Unit.Default;
        }

        private Unit CommandDelete(int selectedIndex)
        {
            if (selectedIndex < 0)
            {
                this.MessageBoxService.Show("No selected data.", "AddressBook", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Error);
                return Unit.Default;
            }

            MessageBoxResult result = this.MessageBoxService.Show("Are you sure to delete?", "AddressBook", MessageBoxButton.OKCancel, MessageBoxImage.Question);
            if (result != MessageBoxResult.OK)
                return Unit.Default;

            this.Persons.RemoveAt(selectedIndex);
            return Unit.Default;
        }

        private Unit CommandModify(int selectedIndex)
        {
            if (selectedIndex < 0)
            {
                this.MessageBoxService.Show("No selected data.", "AddressBook", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Error);
                return Unit.Default;
            }

            Person modifyData = new Person(this.Persons[selectedIndex]);
            IDialogView view = this.CreateAddView(modifyData, AddViewModel.ViewType.Modify);
            if (view.ShowDialog() != true)
                return Unit.Default;

            this.Persons[selectedIndex] = modifyData;
            return Unit.Default;
        }

        private Unit CommandExit(IWindowView view)
        {
            view.Close();
            return Unit.Default;
        }
    }
}