namespace ChivaXR.VR
{
    using System.Collections.Generic;
    using UnityEngine;

    public struct CVR_InteractableTriggerEventArgs
    {
        public IVR_Interactable interactable;
        public CVR_TriggerTool triggerTool;
        public CVR_ToolType toolType;
        public Collider[] triggerObjects;
    }

    /// <summary>
    /// 工具的触发检测参数
    /// </summary>
    public struct ToolTriggerInfos
    {
        public float trigger_DetectionRange;               //触发检测范围
        public CVR_TriggerList.CheckTypes toolCheckTypes;
        public string[] toolCheckInfos;
        public CVR_ButtonPressTypes buttonPressType;
        public CVR_ButtonTypes buttonType;
    }
    /// <summary>
    /// Trigger
    /// </summary>
    /// <param name="sender">this object</param>
    /// <param name="e"><see cref="InteractableObjectEventArgs"/></param>
    public delegate void CVRInteractableTriggerEventHandler(object sender, CVR_InteractableTriggerEventArgs e);

    /// <summary>
    /// 交互工具触发器
    /// </summary>
    [RequireComponent(typeof(IVR_Interactable))]
    public class CVR_TriggerTool : MonoBehaviour
    {
        private IVR_Interactable interactable;
        private GameObject currentHand;
        private List<Collider> _colliders = new List<Collider>();
        private CVR_TriggerList triggerList;
        public CVR_TriggerList TriggerList
        {
            get
            {
                if (triggerList == null)
                {
                    triggerList = this.gameObject.AddComponent<CVR_TriggerList>();
                }
                return triggerList;
            }
        }
        /// <summary>
        /// 触发点
        /// </summary>
        public Transform triggerPoint;
        /// <summary>
        /// 触发范围
        /// </summary>
        public float triggerRange = 0.1f;
        /// <summary>
        /// 按键触发类型
        /// </summary>
        public CVR_ButtonPressTypes buttonPressType = CVR_ButtonPressTypes.PressDown;
        /// <summary>
        /// 按键类型
        /// </summary>
        public CVR_ButtonTypes buttonType = CVR_ButtonTypes.Trigger;
        

        public event CVRInteractableTriggerEventHandler InteractableTrigger;
        private void Awake()
        {
            interactable = this.GetComponent<IVR_Interactable>();

            CVR_ToolManager.Instance.RegisterTriggerTool(interactable.GetToolType(), this);
        }

        private void Update()
        {
            if (interactable.CVR_IsGrabbed() && interactable.CVR_CheckButtonState(buttonType, buttonPressType))
            {
                if (triggerPoint == null)
                {
                    Debug.LogError(this.transform.name + "未添加TriggerPoint");
                    return;
                }
                //射线检测
                RayCheck(triggerPoint.position, triggerRange);
            }
        }

        /// <summary>
        /// 球形射线检测
        /// </summary>
        /// <param name="center"></param>
        /// <param name="radius"></param>
        /// <returns></returns>
        private void RayCheck(Vector3 center, float radius)
        {
            _colliders.Clear();
            Collider[] hitColliders = Physics.OverlapSphere(center, radius);

            for (int i = 0; i < hitColliders.Length; i++)
            {
                if (CVR_TriggerList.Check(hitColliders[i].gameObject, TriggerList))
                {
                    _colliders.Add(hitColliders[i]);
                }
            }

            OnInteractableObjectTrigger(this,
                new CVR_InteractableTriggerEventArgs()
                {
                    interactable = this.interactable,
                    triggerTool = this,
                    toolType = interactable.GetToolType(),
                    triggerObjects = _colliders.ToArray()
                });
        }


        public virtual void OnInteractableObjectTrigger(object sender, CVR_InteractableTriggerEventArgs e)
        {
            if (InteractableTrigger != null)
            {
                InteractableTrigger(this, e);
            }
        }

        /// <summary>
        ///重置工具触发参数
        /// </summary>
        /// <param name="triggerToolInfo"></param>
        public void ResetTriggerInfo(ToolTriggerInfos triggerToolInfo)
        {
            triggerRange = triggerToolInfo.trigger_DetectionRange;
            TriggerList.checkType = triggerToolInfo.toolCheckTypes;
            TriggerList.identifiers.Clear();
            TriggerList.identifiers.AddRange(triggerToolInfo.toolCheckInfos);
            buttonPressType = triggerToolInfo.buttonPressType;
            buttonType = triggerToolInfo.buttonType;
        }
    }
}