using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CarManagerV2
{
    public partial class MainForm : Form
    {
        List<Car> cars = new List<Car>();
        List<Car> lastCars = new List<Car>();

        public MainForm()
        {
            InitializeComponent();
            SafeManager.InitializeFile("cars.csv");
            List<Car> _cars = SafeManager.ReadCars("cars.csv");
            
            refreshCars(_cars);

        }

        private async void refreshCars(List<Car> _cars)
        {
            //if cars havent changed, dont refresh
            //bool changed = false;
            //foreach (Car car in _cars)
            //{
            //    Car existing = cars.FirstOrDefault(c => c.Id == car.Id);
            //    if (existing == null)
            //    {
            //        Console.WriteLine($"Added: {car.Id}");
            //        changed = true;
            //        break;
            //    }
            //    else if (existing.isChanged(car))
            //    {
            //        Console.WriteLine($"Modified: {car.Id} / {existing.Id}");
            //        changed = true;
            //        break;
            //    }

            //}
            //if(!changed && cars.Count == _cars.Count)
            //{
            //    Console.WriteLine("Cars are the same, not refreshing.");
            //    cars = _cars;
            //    return;
            //}

            cars = _cars;


            //if(cars.SequenceEqual(_cars))
            //{
            //    Console.WriteLine("Cars are the same, not refreshing.");
            //    return;
            //}
            //else
            //{
            //    Console.WriteLine("Cars have changed, refreshing.");
            //    Console.WriteLine($"Old cars count: {cars.Count}, New cars count: {_cars.Count}");
            //    //find differences
            //    Console.WriteLine("Saved:");
            //    foreach (var car in cars)
            //    {
            //        Console.Write($"{car.Id}, {car.Make} {car.Model}, {car.Year} | ");
            //    }
            //    Console.WriteLine("-------------------");
            //    Console.WriteLine("New:");
            //    foreach (var car in _cars)
            //    {
            //        Console.Write($"{car.Id}, {car.Make} {car.Model}, {car.Year} | ");
            //    }
            //    Console.WriteLine();
            //    var addedCars = _cars.Except(cars).ToList();
            //    var removedCars = cars.Except(_cars).ToList();
            //    var modifiedCars = _cars.Where(c => cars.Any(c2 => c2.Id == c.Id && !c2.Equals(c))).ToList();
            //    Console.WriteLine($"Added cars: {addedCars.Count}, Removed cars: {removedCars.Count}, Modified cars: {modifiedCars.Count}");
            //}

            // Get the cars currently in the FlowLayoutPanel to compare with _cars


            //flpCars.Controls.Clear();
            foreach (Car car in _cars)
            {
                // not in list? add it
                bool isNew = flpCars.Controls.OfType<CarCard>().All(c => c.Car.Id != car.Id);
                bool isUpdated = false;
                // existing but changed? update it
                CarCard card = new CarCard();
                if (!isNew)
                {
                    CarCard existing = flpCars.Controls.OfType<CarCard>().First(c => c.Car.Id == car.Id);
                    Car existingCar = existing.Car;
                    if (existing == null)
                    {
                        Console.Error.WriteLine($"[L] Error: Existing car card not found for car ID: {car.Id}");
                        continue;
                    }
                    // compare details
                    Console.WriteLine($"[L] Checking car: {car.Id} | Car Color: {car.Color} | Ex Color: {existingCar.Color}");
                    if (existingCar.IsChanged(car))
                    {
                   
                        isUpdated = true;
                        Console.WriteLine($"[L] Updating car: {car.Id}");
                        // changes
                        card = existing;

                    }
                    else
                    {
                        // no changes
                        Console.WriteLine($"[L] No changes for car: {car.Id}");
                        continue;
                    }
                }

                card.CarName = $"{car.Make} {car.Model}";
                card.CarDetails = $"{car.Year}, {car.Mileage} km, ${car.Price}";
                card.Car = car.Clone();
                card.CarImage = await Task.Run(() => ImageManager.GetImage(car));
                // clear existing event handlers to prevent multiple subscriptions
                card.ClearCardClickedHandlers();
                card.CardClicked += (s, e) =>
                {
                    Console.WriteLine($"Card clicked: {car.Id}");
                    CarDetailsForm detailsForm = new CarDetailsForm(car);
                    detailsForm.FormClosed += async (s2, e2) =>
                    {
                        Console.WriteLine("Car details form closed.");
                        // refresh cars
                        Console.WriteLine("Refreshing cars...");
                        List<Car> __cars = await Task.Run(() => SafeManager.ReadCars("cars.csv"));
                        refreshCars(__cars);
                    };
                    detailsForm.ShowDialog();
                };
                if (isNew)
                {
                    flpCars.Controls.Add(card);
                }
            }

            // Remove cards that are no longer in _cars
            var carIds = _cars.Select(c => c.Id).ToList();
            var cardsToRemove = flpCars.Controls.OfType<CarCard>().Where(c => !carIds.Contains(c.Car.Id)).ToList();
            foreach (var card in cardsToRemove)
            {
                flpCars.Controls.Remove(card);
            }
            flpCars.Invalidate();

            flpCars.Refresh();

            lastCars = new List<Car>(cars);


        }


        private void btnNewCar_Click(object sender, EventArgs e)
        {
            Car foocar = StateManager.CreateCar("New", "Car", 2020, "White", 0, 20000);
            CarDetailsForm detailsForm = new CarDetailsForm(foocar);
            detailsForm.FormClosed += (s2, e2) =>
            {
                // refresh cars
                Console.WriteLine("Refreshing cars...");
                cars = SafeManager.ReadCars("cars.csv");
                refreshCars(cars);
            };
            detailsForm.ShowDialog();
        }

        void searchList(string query)
        {
            List<Car> results = new List<Car>();
            foreach (Car car in cars)
            {
                if (car.Make.ToLower().Contains(query.ToLower()) || car.Model.ToLower().Contains(query.ToLower()) || car.Year.ToString().Contains(query) || car.Mileage.ToString().Contains(query) || car.Price.ToString().Contains(query))
                {
                    results.Add(car);
                }
            }
            refreshCars(results);
        }

        private void tbxSearch_TextChanged(object sender, EventArgs e)
        {
            string query = tbxSearch.Text;
            if(string.IsNullOrWhiteSpace(query))
            {
                refreshCars(cars);
            }
            else
            {
                searchList(query);
            }
        }
    }
}