using System;
using System.ComponentModel.DataAnnotations;

namespace BlueWest.Data;

public class MathOperation
{
    [Key] public TimeSpan CreationDate { get; set; }
    public MathOperationType MathOperationType { get;  }
        
    public double LeftAmount { get;  }
    public double RightAmount { get;  }
    public string MathOperationDescription { get; }

    private bool _isCalculated = false;

    private double _resultingAmount;

    public double ResultingAmount
    {
        get
        {
            if (_isCalculated) return _resultingAmount;
            return 0;
        }
    }

    public MathOperation() { }
    public MathOperation(MathOperationType mathOperationType, double leftAmount, double rightAmount, string mathOperationDescription)
    {
        MathOperationType = mathOperationType;
        LeftAmount = leftAmount;
        RightAmount = rightAmount;
        MathOperationDescription = mathOperationDescription;
    }

    public void Calculate()
    {
        _isCalculated = true;
        
        switch (MathOperationType)
        {
            case MathOperationType.Add:
                _resultingAmount = LeftAmount + RightAmount;
                return;
            case MathOperationType.Div:
                _resultingAmount = LeftAmount / RightAmount;
                return;
            case MathOperationType.Mul:
                _resultingAmount = LeftAmount * RightAmount;
                return;
            case MathOperationType.Sub:
                _resultingAmount = LeftAmount - RightAmount;
                return;
        }
    }
}