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

public class AlliesMovement : MonoBehaviour
{
    public GameObject m_ArrowPrefab = null;
    public NavMeshAgent playerAgent;
    public GameObject targetPosition;
    public GameObject ExitPosition;// Just so AlliesManager doesn't need to track it
    private Animator selfAnimator = null;
    private ArcPrediction m_Predictor = null;
    private float triggerRadius = 1f;
    private bool previousAnimationStateWasAiming = false;
    public float arrowForceMin = 0.3f;
    public float arrowForceMax = 0.9f;
    private Vector3 target;
    private string ennemyChestName = "Spine_01";
    private string selfHeadName = "Head";
    public AudioSource m_bowShootingSound;

    // Update is called once per frame
    void FixedUpdate()
    {
        NavMeshSetup();
    }

    void Awake()
    {
        selfAnimator = GetComponent<Animator>();
    }
    
    void Start()
    {
        m_Predictor = GetComponentInChildren<ArcPrediction>();
        m_Predictor.HideArc();    
    }

    private void OnDestroy()
    {
        playerAgent.enabled = false;
    }

    private void NavMeshSetup()
    {
        if (!playerAgent.enabled)
        {
            playerAgent.enabled = true;
        }

        NavmeshAgentMovement();
    }

    void NavmeshAgentMovement()
    {
        if (NearTargetPosition())
        {
            TryShootEnemy();
        }
        else
        {
            selfAnimator.runtimeAnimatorController = Resources.Load("Animations/SlowRun/SlowRunController") as RuntimeAnimatorController;
            playerAgent.SetDestination(targetPosition.transform.position);
        }
    }

    void TryShootEnemy()
    {
        Enemy[] enemies = GameObject.FindObjectsOfType<Enemy>();
        if (enemies.Length > 0)
        {
            Vector3 selfHead = GetChildWithName(transform, selfHeadName).position;
            Enemy closestVisibleEnemy = null;
            float enemyClosestDistence = 1000000000f;
            foreach (Enemy enemy in enemies)
            {
                //Aim for the chest for higher odds of touching
                Vector3 enemyChest = GetChildWithName(enemy.transform, ennemyChestName).position;
                if (Vector3.Distance(enemyChest, selfHead) < enemyClosestDistence)
                {
                    if (Physics.Linecast(selfHead, enemyChest, out RaycastHit hit))
                    {
                        if (hit.collider.transform.IsChildOf(enemy.transform))// Found a closer enemy that is visible that can be shot
                        {
                            closestVisibleEnemy = enemy;
                            enemyClosestDistence = Vector3.Distance(enemyChest, selfHead);
                        }
                    } else// Did not colide anything, including the enemy, so it should be fine to shoot?
                    {
                        closestVisibleEnemy = enemy;
                        enemyClosestDistence = Vector3.Distance(enemyChest, selfHead);
                    }
                }
            }
            if (closestVisibleEnemy != null)
            {
                //Aim for the chest for higher odds of touching
                Vector3 enemyChest = GetChildWithName(closestVisibleEnemy.transform, ennemyChestName).position;
                transform.LookAt(enemyChest);

                bool nextAnimationStateWasAiming = selfAnimator.GetCurrentAnimatorStateInfo(0).IsName("Aiming");
                if(nextAnimationStateWasAiming != previousAnimationStateWasAiming){
                    target = enemyChest;
                }

                previousAnimationStateWasAiming = nextAnimationStateWasAiming;
                if (selfAnimator.runtimeAnimatorController.name != "BowDrawController")
                {
                    selfAnimator.runtimeAnimatorController = Resources.Load("Animations/BowDraw/BowDrawController") as RuntimeAnimatorController;
                }
            }
            else
            {
                if (selfAnimator.runtimeAnimatorController.name != "Idle")
                {
                    selfAnimator.runtimeAnimatorController = Resources.Load("Animations/Idle/Idle") as RuntimeAnimatorController;
                }
            }
        }else
            {
                if (selfAnimator.runtimeAnimatorController.name != "Idle")
                {
                    selfAnimator.runtimeAnimatorController = Resources.Load("Animations/Idle/Idle") as RuntimeAnimatorController;
                }
            }
    }

    private Transform GetChildWithName(Transform parent, string name)
    {
        if(parent.childCount > 0)
        {
            foreach (Transform child in parent)
            {
                if (child.name == name)
                    return child;

                if (child.childCount > 0)
                {
                    Transform subChild = GetChildWithName(child, name);
                    if (subChild != null)
                    {
                        return subChild;
                    }
                }
            }
        } 

        return null;
    }

    bool NearTargetPosition()
    {
        if (targetPosition != null)
        {
            return Vector3.Distance(targetPosition.transform.position, this.transform.position) < triggerRadius;
        }
        return true; // If no target is set, assume it's in position
    }

    // Called by an animation event
    private void FireArrow()
    {
        // Arrow setup
        Transform bowTransform = GetChildWithName(transform, "ModifiedAssetBowWithBlender");
        GameObject arrowObject = Instantiate(m_ArrowPrefab, bowTransform.position, new Quaternion(0, 1f, -0.1f, 0.2f));
        Arrow arrow = arrowObject.GetComponent<Arrow>();
        Vector3 shootingDirection = new Vector3(target.x,bowTransform.position.y, target.z);
        arrowObject.transform.LookAt(shootingDirection);
        arrowObject.GetComponent<Rigidbody>().detectCollisions = false;

        // Figuring out the required force
        float arrowForce = arrowForceMin;
        float flightTime = 1.4142135f*Mathf.Sqrt((target.y - bowTransform.position.y)/Physics.gravity.y);
        float distanceX = target.x - bowTransform.position.x;
        float distanceZ = target.z - bowTransform.position.z;
        float targetSpeed = Mathf.Sqrt(distanceX*distanceX+distanceZ*distanceZ)/flightTime;
        float neededPower = targetSpeed / arrow.m_MaxLaunchSpeedMeterPerSecond;
        
        if(neededPower > arrowForceMin && neededPower < arrowForceMax){
            arrowForce = neededPower;
        } else if (neededPower > arrowForceMax){ // Likely gonna miss, but lmao nice try
            arrowForce = arrowForceMax;
        }
        // Fire the arrow
        m_Predictor.RenderArc(arrowForce * arrow.m_MaxLaunchSpeedMeterPerSecond, 20, arrowObject.transform.forward);
        arrow.Fire(arrowForce, arrowObject.transform.forward, m_bowShootingSound);
    }
}