using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace PT_lab10
{
    public class CarBindingList : BindingList<Car>
    {
        List<Car> originalList;
        public List<Car> foundCars;
        private bool isEngine = false;

        private void UpdateCarBindingList(List<Car> items)
        {
            base.ClearItems();

            for (int i = 0; i < items.Count; i++)
            {
                base.InsertItem(i, items[i]);
            }
        }
        public CarBindingList(List<Car> list)
        {
            originalList = list;
            UpdateCarBindingList(list);
            foundCars = new List<Car>();
        }

        protected override bool SupportsSortingCore
        {
            get { return true; }
        }
        protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
        {
            if (prop.PropertyType.GetInterface("IComparable") != null)
            {
                originalList = (originalList.OrderBy(elem => prop.GetValue(elem))).ToList();
                if (direction == ListSortDirection.Descending)
                {
                    originalList.Reverse();
                }
                UpdateCarBindingList(originalList);
                OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
            }
            else
            {
                Console.WriteLine(String.Format("Cannot sort by {0}. Lack of IComperable implementation.", prop.Name));
                //throw new NotSupportedException(String.Format("Cannot sort by {0}. Lack of IComperable implementation.", prop.Name));
            }
        }

        public void Sort(string property, ListSortDirection direction)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(Car));
            PropertyDescriptor prop = properties.Find(property, true);
            if (prop != null)
            {
                ApplySortCore(prop, direction);
            }
            else
            {
                throw new NotSupportedException(String.Format("Cannot sort by {0}, this property doesn\'t exist.", prop.Name));
            }
        }

        protected override bool SupportsSearchingCore
        {
            get { return true; }
        }

        protected override int FindCore(PropertyDescriptor prop, object key)
        {
            int counter = 0;
            if (!isEngine)
            {
                PropertyInfo property = typeof(Car).GetProperty(prop.Name);
                Car item;

                for (int i = 0; i < Count; ++i)
                {
                    item = (Car)Items[i];
                    if (property.GetValue(item, null).Equals(key))
                    {
                        foundCars.Add(item);
                        counter++;
                    }
                }
            }
            else
            {
                PropertyInfo property = typeof(Engine).GetProperty(prop.Name);

                for (int i = 0; i < Count; ++i)
                {
                    if (property.GetValue(Items[i].motor, null).Equals(key))
                    {
                        foundCars.Add(Items[i]);
                        counter++;
                    }
                }
            }

            if (counter != 0) return 1;
            else return -1;
        }

        public bool Find(string propertyValue, string propertyName)
        {
            foundCars.Clear();

            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(Car));

            if (propertyName.Contains('.'))
            {
                isEngine = true;
                propertyName = propertyName.Split('.')[1];
                properties = TypeDescriptor.GetProperties(typeof(Engine));
            }

            object key;
            if (propertyValue.All(Char.IsDigit))
            {
                key = Int32.Parse(propertyValue);
            }
            else
            {
                key = propertyValue;
            }

            PropertyDescriptor prop = properties.Find(propertyName, true);
            if (FindCore(prop, key) == 1)
            {
                isEngine = false;
                return true;
            }


            isEngine = false;
            return false;
        }

    }
}