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

namespace ProjectMonorail.MovementStrategy;

public abstract class AbstractStrategy
{
    /// <summary>
    /// Перемещаемый объект
    /// </summary>
    private IMovableObjects? _moveableObject;

    /// <summary>
    /// Статус перемещения
    /// </summary>
    private StrategyStatus _state = StrategyStatus.NotInit;

    /// <summary>
    /// Ширина поля
    /// </summary>
    protected int FieldWidth {  get; private set; }

    /// <summary>
    /// Высота поля
    /// </summary>
    protected int FieldHeight { get; private set; }

    /// <summary>
    /// Статус перемещения
    /// </summary>
    /// <returns></returns>
    public StrategyStatus GetStatus() { return _state; }

    /// <summary>
    /// Установка данных
    /// </summary>
    /// <param name="movableObject">Перемещаемый объект</param>
    /// <param name="width">Ширина поля</param>
    /// <param name="height">Высота поля</param>
    public void SetData(IMovableObjects movableObject, int width, int height)
    {
        if (movableObject == null)
        {
            _state = StrategyStatus.NotInit;
            return;
        }

        _state = StrategyStatus.InProgress;
        _moveableObject = movableObject;
        FieldHeight = height;
        FieldWidth = width;
    }

    /// <summary>
    /// Шаг перемещения
    /// </summary>
    public void MakeStep()
    {
        if (_state != StrategyStatus.InProgress)
        {
            return;
        }

        if (IsTargetDestination())
        {
            _state = StrategyStatus.Finish;
            return;
        }

        MoveToTarget();
    }

    /// <summary>
    /// Шаг влево
    /// </summary>
    /// <returns></returns>
    protected bool MoveLeft() => MoveTo(MovementDirection.Left);

    /// <summary>
    /// Шаг вверх
    /// </summary>
    /// <returns></returns>
    protected bool MoveUp() => MoveTo(MovementDirection.Up);

    /// <summary>
    /// Шаг вправо
    /// </summary>
    /// <returns></returns>
    protected bool MoveRight() => MoveTo(MovementDirection.Right);

    /// <summary>
    /// Шаг вниз
    /// </summary>
    /// <returns></returns>
    protected bool MoveDown() => MoveTo(MovementDirection.Down);

    /// <summary>
    /// Параметры объекта
    /// </summary>
    protected ObjectParameters? GetObjectParameters => _moveableObject?.GetObjectPosition;

    /// <summary>
    /// Шаг объекта
    /// </summary>
    /// <returns></returns>
    protected int? GetStep()
    {
        if(_state != StrategyStatus.InProgress)
        {
            return null;
        }
        return _moveableObject?.GetStep;
    }

    /// <summary>
    /// Перемещение к цели
    /// </summary>
    protected abstract void MoveToTarget();

    /// <summary>
    /// Достигнута ли цель
    /// </summary>
    /// <returns></returns>
    protected abstract bool IsTargetDestination();

    private bool MoveTo(MovementDirection movementDirection)
    {
        if (_state != StrategyStatus.InProgress)
        {
            return false;
        }
        return _moveableObject?.TryMoveObject(movementDirection) ?? false;
    }
}