using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// 需要受物理系统托管的动作：
//   跳跃上升
//   跳跃下降
//   空中受击
// 
// 
// 不会受物理系统托管的动作：
//   单个招式
//   空中连击
// 
// 
// 一般来说启用物理是被动的

/// <summary>
/// 刚体
/// </summary>
public sealed class PhysicsBody : MonoBehaviour
{

    // 是否朝向右侧（正向）
    public bool IsFaceRight
    {
        get 
        {
            float rotY = Quaternion.ToEulerAngles(transform.rotation).y;
            rotY = Mathf.Rad2Deg * rotY;
            bool right = rotY >= 0 && rotY <= 180;
			return right;
        }
    }

    // 全局速度，以世界为参考系
    [SerializeField]
    public Vector3 Velocity
    {
        get
        {
            Vector3 vel = m_LocalVelocity; 
            if (!IsFaceRight)
                vel.x = -vel.x;
            return vel;
        }
        set
		{
            if (IsFaceRight)
                m_LocalVelocity = value;
            else
                m_LocalVelocity = new Vector3(-value.x, value.y, value.z);
		}
    }

    // 以自身为参考系的速度，x>0向前，x<0向后，y>0向上，y<0向下。默认情况下以右为正方向
    // 设置速度应该以local velocity为准
    [SerializeField]
    private Vector3 m_LocalVelocity;

    public Vector3 LocalVelocity
    {
        get
        {
            return m_LocalVelocity;
        }
        set
        {
            m_LocalVelocity = value;
        }
    }

    [SerializeField]
    private float m_Weight;
    public float Weight
    {
        get
        {
            return m_Weight;
        }
	}

	[Tooltip("ignore gravity?")]
	[SerializeField]
	private bool m_UseGravity;
	public bool UseGravity
	{
		get
		{
			return m_UseGravity;
		}
		set 
		{
			m_UseGravity = value;
		}
	}

	[SerializeField]
    private Vector3 m_Accelaration;
    public Vector3 Accelaration
    {
        get
        {
            return m_Accelaration;
        }
    }

    [Tooltip("地面摩擦系数")]
    [SerializeField]
    private float m_Frication;
    public float GroundFriction
    {
        get { return m_Frication; }
    }

    [Tooltip("空气摩擦力")]
    [SerializeField]
    private float m_AirFriction;
    public float AirFriction
    {
        get { return m_AirFriction; }
    }

    [Tooltip("力")]
	[SerializeField]
	private Vector3 m_Force;
    public Vector3 Force
    {
        get
        {
            return m_Force;
        }
    }

	[SerializeField]
	private PhysicsPrimitive m_Primitive;


	public void AddForce(Vector3 force)
	{
		m_Force += force;
	}

    public void AddLocalForce(Vector3 localForce)
    {
        m_Force += localToWorldDir(localForce);
    }

	public void SetForce(Vector3 force)
	{
		m_Force = force;
	}

    public void SetLocalForce(Vector3 localForce)
    {
        m_Force = localToWorldDir(localForce);
    }

    public Vector3 localToWorldDir(Vector3 local)
    {
        if (IsFaceRight)
            return local;
        else
            return new Vector3(-local.x, local.y, local.z);
    }

}