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

namespace ObjectScripts
{
    public class EventScript : AbstractEventScript
    {

        ///<summary>
        /// GameObject to indicate event from far away
        ///</summary>
        GameObject EventFlag;
        ///<summary>
        /// 
        ///</summary>
        GameObject EventFlagpole;
        ///<summary>
        /// Prefab to indicate ideal viewing point
        ///</summary>
        GameObject EventViewingPoint;
        ///<summary>
        /// is event flag visible
        ///</summary>
        bool EventFlagIsVisible = true;
        ///<summary>
        /// 
        ///</summary>

        [SerializeField] string nameOfCamera;
        ///<summary>
        /// EventFlag prefab
        ///</summary>
        [SerializeField] GameObject Flag;
        ///<summary>
        /// time an event is shown earlier and longer than start- and endtimestamp
        ///</summary>
        [SerializeField] double InTimeOffset = 3;
        ///<summary>
        /// Array of Sprites indicating each Eventtype
        ///</summary>
        [SerializeField] Sprite[] EventImages;
        ///<summary>
        /// not used
        ///</summary>
        Sprite EventImage;
        ///<summary>
        /// not used
        ///</summary>
        SpriteRenderer EventSpriteRenderer;
        ///<summary>
        /// Position of the flage. Changes with the Player
        ///</summary>
        Vector3 flagPosition;
        ///<summary>
        /// event is in time. timestamp of event +-offset reached
        ///</summary>

        public bool inTime = true;

        // Start is called before the first frame update
        void Start()
        {
            //Create Flag and EventPoint
            EventFlag = Instantiate(Flag, Vector3.zero, new Quaternion());
            EventPoint = GameObject.CreatePrimitive(PrimitiveType.Sphere);


            // set positions
            EventPoint.transform.SetParent(this.gameObject.transform);
            EventFlag.transform.SetParent(this.EventPoint.transform);
            EventFlag.transform.Find("EventImage").gameObject.GetComponent<SpriteRenderer>().sprite = EventImages[(int)Event.Type];

            EventPoint.name = "EventPoint";
            EventFlag.name = "EventFlag";


            this.gameObject.transform.position = Event.Pos;

            // if ideal viewing position is set. indicate ideal viewing postion
            flagPosition = this.EventFlag.transform.position;
            if (!Event.IdealViewingPos.Equals(Event.Pos))
            {
                EventViewingPoint = GameObject.CreatePrimitive(PrimitiveType.Cube);
                EventViewingPoint.transform.SetParent(this.EventPoint.transform);
                EventViewingPoint.transform.position = Event.IdealViewingPos;
                EventViewingPoint.name = "EventViewingPoint";
            }

            Position2D = new Vector2(EventPoint.transform.position.x, EventPoint.transform.position.z);
            // SetEventPointIsVisible(false);
            EventIsVisible = true;
        }


        void Update()
        {
            //If event in time then object will be visible
            if (EventInTime())
            {
                if (!inTime)
                {
                    inTime = true;
                    ChangeEventVisibilityTo(true);
                }

            }
            else
            {
                if (inTime)
                {
                    inTime = false;
                    ChangeEventVisibilityTo(false);
                }
            }
            HandleFlagBehavior();


            //DrawPole(this.EventFlagpole, this.EventPoint.transform.position, this.EventFlag.transform.position);


        }
        ///<summary>
        /// Handle Flag Positon. Flag will have the same y-coordinate as the player
        ///</summary>
        private void HandleFlagBehavior()
        {
            this.EventFlag.transform.LookAt(this.Camera.transform);
            flagPosition = this.EventFlag.transform.position;
            this.EventFlag.transform.position = new Vector3(flagPosition.x, this.Camera.transform.position.y, flagPosition.z);
            if (inTime)
            {
                if (this.EventFlag.transform.localPosition.y < 1 && this.EventFlag.transform.localPosition.y > -1)
                {
                    this.EventFlag.GetComponent<SpriteRenderer>().enabled = false;
                }
                else
                {
                    if (!this.EventFlag.GetComponent<SpriteRenderer>().enabled)
                    {
                        this.EventFlag.GetComponent<SpriteRenderer>().enabled = true;
                    }
                    if (this.EventFlag.transform.localPosition.y < -1)
                    {
                        this.EventFlag.GetComponent<SpriteRenderer>().flipY = true;
                    }
                    else
                    {
                        this.EventFlag.GetComponent<SpriteRenderer>().flipY = false;
                    }
                }
            }
        }
        ///<summary>
        /// currenttimestamp in intervall [TimestampStart - InTimeOffset ,TimestampEnd + InTimeOffset ]
        ///</summary>
        private bool EventInTime()
        {

            return (this.EventHandler.CurrentTimestamp >= this.Event.TimestampStart - InTimeOffset
                && (this.EventHandler.CurrentTimestamp <= this.Event.TimestampEnd + InTimeOffset || ((this.Event.TimestampEnd == -1 && this.EventHandler.CurrentTimestamp <= this.Event.TimestampStart + InTimeOffset)))); // || this.Event.TimestampEnd == -1
        }
        ///<summary>
        /// set Event visible or invisible
        ///</summary>
        private void ChangeEventVisibilityTo(bool visible)
        {

            foreach (Renderer renderer in this.GetComponentsInChildren<Renderer>(visible))
            {
                renderer.enabled = visible;
            }
            this.EventIsVisible = visible;
        }
        ///<summary>
        /// 
        ///</summary>
        private void DrawPole(GameObject poleObject, Vector3 eventPointposition, Vector3 eventFlagposition)
        {


            float distancesBetweenPointAndFlag = eventFlagposition.y - eventPointposition.y;
            Renderer poleObjectRenderer = poleObject.GetComponent<Renderer>();
            Vector3 poleObjectCurrentScale = poleObject.transform.localScale;
            Vector3 poleObjectSize = poleObjectRenderer.bounds.size;
            float poleObjectHeight = poleObjectSize.y / poleObjectCurrentScale.y;

            float amountPoleObjects = distancesBetweenPointAndFlag / poleObjectHeight;
            Vector3 polePos = poleObject.transform.position;

            poleObject.transform.localPosition = new Vector3(polePos.x, amountPoleObjects + 2 * poleObjectHeight, polePos.z);
            poleObject.transform.localScale = new Vector3(poleObjectCurrentScale.x, amountPoleObjects - 2 * poleObjectHeight, poleObjectCurrentScale.z);

        }
        ///<summary>
        /// 
        ///</summary>

        private void FixedUpdate()
        {
            // SetEventPointIsVisible(CheckObjectVisible(EventPoint, Camera, ignoreNames));
            // EventFlagIsVisible = CheckObjectVisible(EventFlag, Camera, ignoreNames);


        }
        ///<summary>
        /// 
        ///</summary>
        private bool CheckObjectVisible(GameObject obj, GameObject Camera, string ignoreNames)
        {
            RaycastHit raycastHit;
            if (obj.GetComponent<Renderer>().isVisible)
            {
                if (Physics.Raycast(Camera.transform.position, obj.transform.position - Camera.transform.position, out raycastHit))
                {
                    string hitName = raycastHit.collider.gameObject.name;
                    if (ignoreNames.Contains(hitName))
                    {
                        return true;
                    }
                    else
                    {
                        return false;
                    }
                }
                else
                {
                    return true;
                }
            }
            else
            {
                return false;
            }
        }
    }
}