using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Caisses
{
    internal class GraphicalStore
    {
        private List<GraphicalCheckout> _checkouts;
        private List<GraphicalClient> _clients;
        private int _timeOfTheDayInMinuts;
        private Bitmap _shelvesCorner;
        private Bitmap _checkoutCorner;
        private Random rnd;

        public static readonly int[] ATTENDANCE = { 0, 0, 0, 0, 0, 0, 0, 30, 30, 40, 50, 60, 100, 80, 50, 30, 80, 100, 50, 50, 80, 0, 0, 0 };
        const int CROSSOVER_TIME = 10;

        public int TimeOfTheDayInMinuts { get => _timeOfTheDayInMinuts; set => _timeOfTheDayInMinuts = value; }
        public List<GraphicalClient> Clients { get => _clients; set => _clients = value; }
        internal List<GraphicalCheckout> Checkouts { get => _checkouts; set => _checkouts = value; }
        public Bitmap ShelvesCorner { get => _shelvesCorner; set => _shelvesCorner = value; }
        public Bitmap CheckoutCorner { get => _checkoutCorner; set => _checkoutCorner = value; }

        public int TimeOfTheDayInHours
        {
            get { return _timeOfTheDayInMinuts / 60; }
        }

        public GraphicalStore(int startingHour,int checkoutNumber, Size shelvesCornerSize,Size checkoutCornerSize)
        {
            TimeOfTheDayInMinuts = startingHour * 60;
            Clients = new List<GraphicalClient>();
            Checkouts = new List<GraphicalCheckout>();
            CheckoutCorner = new Bitmap(checkoutCornerSize.Width,checkoutCornerSize.Height);
            ShelvesCorner = new Bitmap(shelvesCornerSize.Width,shelvesCornerSize.Height);
            rnd = new Random();

            FillStore(ATTENDANCE[TimeOfTheDayInHours]);
            populateCheckouts(checkoutNumber);
            Tick();
        }
        public void populateCheckouts(int numberOfCheckouts)
        {
            int checkoutWidth = CheckoutCorner.Width / numberOfCheckouts + 1;
            for (int i = 0; i < numberOfCheckouts; i++)
            {
                Point position = new Point(i * checkoutWidth + checkoutWidth / numberOfCheckouts, 0);
                Checkouts.Add(new GraphicalCheckout(position, new Rectangle(new Point(0, 0), new Size(CheckoutCorner.Width, CheckoutCorner.Height)), numberOfCheckouts));
            }
        }

        public void Tick()
        {
            TimeOfTheDayInMinuts++;
            if (TimeOfTheDayInMinuts % 60 == 0)
            {
                //Its a new Hour so we can send the new clients
                int amountOfNewCLients = ATTENDANCE[TimeOfTheDayInHours];
                FillStore(amountOfNewCLients);
            }

            int cumulatedWaitingTime = 0;
            int averageWaitingTime = 0;

            foreach (GraphicalClient client in Clients)
            {
                client.Tick();
                cumulatedWaitingTime += client.WaitingTime;
            }
            if (Clients.Count == 0)
            {
                averageWaitingTime = 0;
            }
            else
            {
                averageWaitingTime = cumulatedWaitingTime / Clients.Count;
            }
            foreach (GraphicalCheckout checkout in Checkouts)
            {
                checkout.Tick(averageWaitingTime,CROSSOVER_TIME);
            }

            //Processing the checkout mechanism
            int openPlacesAmount = GetAmountOfPlacesLeft();

            List<GraphicalClient> clientsToRemove = new List<GraphicalClient>();
            foreach (GraphicalClient client in Clients)
            {
                if (client.State == Client.ClientState.Waiting)
                {
                    if (openPlacesAmount > 0)
                    {
                        List<GraphicalCheckout> checkoutsWithFreeSpace = GetNotFullCheckouts();
                        if (checkoutsWithFreeSpace.Count > 0)
                        {
                            //Now we select a random one to put our waiting client
                            int index = 0;
                            int count = checkoutsWithFreeSpace.Count - 1;
                            if (count > 0)
                            {
                                index = rnd.Next(0, checkoutsWithFreeSpace.Count - 1);
                            }
                            else
                            {
                                index = 0;
                            }
                            checkoutsWithFreeSpace[index].Clients.Add(client);
                            //Clients.Remove(client);
                            clientsToRemove.Add(client);
                            client.State = Client.ClientState.Inline;
                        }
                    }
                }
            }
            foreach (GraphicalClient client in clientsToRemove)
            {
                Clients.Remove(client);
            }

            foreach (GraphicalCheckout checkout in Checkouts)
            {
                if (checkout.Open && checkout.Clients.Count > 0)
                {
                    Client cClient = checkout.Clients[0];
                    if (cClient.State != Client.ClientState.Checkout)
                        cClient.State = Client.ClientState.Checkout;

                    if (cClient.CheckoutTime <= 0)
                    {
                        checkout.Clients.Remove(cClient);
                        //We dont load the next because he should be loaded the next time this function is loaded
                    }

                    foreach (GraphicalClient ccClient in checkout.Clients)
                    {
                        ccClient.Tick();
                    }
                }
            }
        }
        public List<Bitmap> Draw()
        {
            ShelvesCorner = new Bitmap(ShelvesCorner.Width,ShelvesCorner.Height);
            CheckoutCorner = new Bitmap(CheckoutCorner.Width,CheckoutCorner.Height);
            foreach (GraphicalClient client in Clients)
            {
                client.Draw(ShelvesCorner);
            }

            foreach (GraphicalCheckout checkout in Checkouts)
            {
                checkout.Draw(CheckoutCorner);
                foreach (GraphicalClient client in checkout.Clients)
                {
                    client.Draw(ShelvesCorner);
                }
            }

            return new List<Bitmap> { ShelvesCorner, CheckoutCorner };
        }
        public virtual void FillStore(int amountOfNewClients)
        {
            for (int i = 0; i < amountOfNewClients; i++)
            {
                Clients.Add(new GraphicalClient(new Point(0,0),rnd));
            }
        }
        public List<GraphicalClient> GetClientsWithoutCheckout()
        {
            List<GraphicalClient> result = new List<GraphicalClient>();
            foreach (GraphicalClient client in Clients)
            {
                if (client.State == Client.ClientState.Waiting)
                    result.Add(client);
            }
            return result;
        }
        public List<GraphicalCheckout> GetNotFullCheckouts()
        {
            List<GraphicalCheckout> result = new List<GraphicalCheckout>();
            foreach (GraphicalCheckout checkout in Checkouts)
            {
                if (checkout.Clients.Count < Checkout.MAX_CAPACITY && checkout.Open)
                {
                    result.Add(checkout);
                }
            }
            return result;
        }
        public int GetAmountOfPlacesLeft()
        {
            int result = 0;
            foreach(GraphicalCheckout checkout in Checkouts)
            {
                if (checkout.Open)
                {
                    result += Checkout.MAX_CAPACITY - checkout.Clients.Count();
                }
            }
            return result;
        }
        public int GetAverageWaitingTime()
        {
            int cumulatedWaitingTime = 0;
            int averageWaitingTime = 0;

            foreach (GraphicalClient client in Clients)
            { 
                cumulatedWaitingTime += client.WaitingTime;
            }
            if (Clients.Count == 0)
            {
                averageWaitingTime = 0;
            }
            else
            {
                averageWaitingTime = cumulatedWaitingTime / Clients.Count;
            }

            return averageWaitingTime;
        }
    }
}