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

namespace LabSabloan7._2State
{
    class HasCoinState : State
    {
        public HasCoinState(VendingMachine Machine) : base(Machine)
        {
        }
        public override bool BuyProduct()
        {
            Console.WriteLine("You can retreive the product.");
            this.Machine.SetMachineState(Machine.SoldState);
            return true;
        }

        public override bool Dispense()
        {
            Console.WriteLine("You ");
            return false;
        }

        public override bool EjectCoin()
        {
            Console.WriteLine("You can retreive your coin.");
            this.Machine.SetMachineState(Machine.NoCoinState);
            return true;
        }

        public override bool InsertCoin()
        {
            Console.WriteLine("You do not has posibility to insert coin, becouse is already inserted.");
            return false;
        }
    }
}

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

namespace LabSabloan7._2State
{

    class NoCoinState : State {

        public NoCoinState(VendingMachine Machine) : base(Machine)
        {
        }
        public override bool BuyProduct()
        {
            Console.WriteLine("Please insert coin!");
            return false;
        }

        public override bool Dispense()
        {
            Console.WriteLine("Please insert coin and chose a product!");
            return false;
        }

        public override bool EjectCoin()
        {
            Console.WriteLine("You do not has coin to eject!");
            return false;
        }

        public override bool InsertCoin()
        {
            Console.WriteLine("Coins has been inserted sucsessfully!");
            this.Machine.SetMachineState(Machine.HasCoinState);
            return true;
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LabSabloan7._2State
{
    public enum EUserOption
    {
        InsertCoin,
        EjectCoin,
        BuyProduct,
        InspectMachine,
        FillMachine,
        Exit
    }
    class Program
    {
        static void Main(string[] args)
        {
            VendingMachine _vendingMachine = new VendingMachine();

            Console.WriteLine(" 1.Insert coin\n" +
                " 2.Eject coin\n" +
                " 3.Buy product\n" +
                " 4.Refill\n" +
                " 5.Inspect machine\n" +
                " 6.Exit\n");


            while (true)
            {

                switch (Console.ReadKey(true).KeyChar)
                {
                    case '1':
                        _vendingMachine.UpdateState(EUserOption.InsertCoin);
                        break;
                    case '2':
                        _vendingMachine.UpdateState(EUserOption.EjectCoin);
                        break;
                    case '3':
                        _vendingMachine.UpdateState(EUserOption.BuyProduct);
                        break;
                    case '4':
                        _vendingMachine.UpdateState(EUserOption.FillMachine);
                        break;
                    case '5':
                        _vendingMachine.UpdateState(EUserOption.InspectMachine);
                        break;
                    case '6':
                        _vendingMachine.UpdateState(EUserOption.Exit);
                        break;
                }
            }
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LabSabloan7._2State
{
    class SoldOutState : State
    {
        public SoldOutState(VendingMachine Machine) : base(Machine)
        {
        }

        public override bool BuyProduct()
        {
            Console.WriteLine("Sold out!");
            return false;
        }

        public override bool Dispense()
        {
            Console.WriteLine("Sold out!");
            return false;
        }

        public override bool EjectCoin()
        {
            Console.WriteLine("You do not has coins inserted.");
            return false;
        }

        public override bool InsertCoin()
        {
            Console.WriteLine("You do not has posibility to insert coin, becouse sold is out.");
            return false;
        }
    }
}

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

namespace LabSabloan7._2State
{
    class SoldState : State
    {
        public SoldState(VendingMachine Machine) : base(Machine)
        {
        }

        public override bool BuyProduct()
        {
            Console.WriteLine("Please insert coins!");
            return false;
        }

        public override bool Dispense()
        {
            Console.WriteLine("Please insert coins!");
            return false;
        }

        public override bool EjectCoin()
        {
            Console.WriteLine("You do not has coin to eject!");
            return false;
        }

        public override bool InsertCoin()
        {
            Console.WriteLine("Coins has been inserted sucsessfully!");
            this.Machine.SetMachineState(Machine.HasCoinState);
            return true;
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LabSabloan7._2State
{
    abstract class State
    {
        public VendingMachine Machine { get; set; }

        public abstract bool InsertCoin();
        public abstract bool EjectCoin();
        public abstract bool BuyProduct();
        public abstract bool Dispense();

        public State(VendingMachine machine)
        {
            this.Machine = machine;
        }
    }
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LabSabloan7._2State
{
    class VendingMachine
    {
        private int capacity;
        private State maschineState;
        public State NoCoinState;
        public State SoldOutState;
        public State SoldState;
        public State HasCoinState;

        public VendingMachine()
        {
            NoCoinState = new NoCoinState(this);
            SoldOutState = new SoldOutState(this);
            SoldState = new SoldState(this);
            HasCoinState = new HasCoinState(this);
            this.capacity = 10;
            this.maschineState = NoCoinState;
        }

        public void UpdateState(EUserOption option)
        {
            switch (option)
            {
                case EUserOption.InsertCoin:
                    InsertCoin();
                    break;
                case EUserOption.EjectCoin:
                    EjectCoin();
                    break;
                case EUserOption.BuyProduct:
                    BuyProduct();
                    break;
                case EUserOption.FillMachine:
                    ReFill();
                    break;
                case EUserOption.InspectMachine:
                    Inspect();
                    break;
                case EUserOption.Exit:
                    maschineState = NoCoinState;
                    break;
            }
        }

        private void ReFill()
        {
            this.capacity = 10;
        }

        private bool InsertCoin()
        {
            return maschineState.InsertCoin();
        }

        private bool EjectCoin()
        {
            return maschineState.EjectCoin();
        }

        private bool BuyProduct()
        {
            if (maschineState.BuyProduct())
            {
                capacity--;
                if (IsEmpty())
                {
                    maschineState = SoldOutState;
                }
                return true;
            }
            return false;
        }

        private void Inspect()
        {
            Console.WriteLine("The capacity is:"+capacity);
        }

        public bool IsEmpty()
        {
            if (capacity == 0){
                return true;
            }
            return false;
        }

        public void SetMachineState(State state)
        {
            maschineState = state;
        }

    }
}