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

//* General Comments or Finished Tasks
//TODO Tasks left to be done for game
//! Bugs or Issues
//? Questions or Suggestions

//TODO AI Script for the Stick Beating Game
//* AI for enemies to run away from the character once in range
//* AI should change direction every few seconds to make it harder for the player to hit them
//* AI should not go into a direction within the player's range
//* If player is not in range, AI should move randomly
//TODO Slow down AI when hit by player rock
//TODO AI dies if hit by player stick
//? Enemy AI gets stuck in corners - maybe have AI move in a random direction if it gets stuck

public class AIScript : MonoBehaviour
{
    public NavMeshAgent agent;
    public float range;
    public Transform centrePoint;
    private bool playerInRange = false;
    public bool isHit = false;
    private void Awake()
    {
        agent = GetComponent<NavMeshAgent>();
    }

    private void Update()
    {
        if(agent.remainingDistance <= agent.stoppingDistance && !playerInRange)
        {
            Vector3 point;
            if(RandomPoint(centrePoint.position, range, out point))
            {
                Debug.DrawRay(point, Vector3.up, Color.blue, 1.0f);
                agent.SetDestination(point);
            }
        }
        else if(playerInRange && !isHit)
        {
            agent.speed = 7.0f;
            RunAway();
        }

        if(isHit)
        {
            agent.speed = 1.75f;
        }
        else
        {
            agent.speed = 3.5f;
        }
    }

    void RunAway()
    {
        Vector3 direction = transform.position - centrePoint.position;
        Vector3 runTo = transform.position + direction.normalized;
        NavMeshHit hit;
        NavMesh.SamplePosition(runTo, out hit, 5.0f, NavMesh.AllAreas);
        agent.SetDestination(hit.position);
    }

    bool RandomPoint(Vector3 center, float range, out Vector3 result)
    {
        Vector3 randompoint = center + Random.insideUnitSphere * range;
        NavMeshHit hit;
        if (NavMesh.SamplePosition(randompoint, out hit, 1.0f, NavMesh.AllAreas))
        {
            result = hit.position;
            return true;
        }
        result = Vector3.zero;
        return false;
    }

    private void OnTriggerEnter(Collider other)
    {
        if(other.tag == "Player")
        {
            playerInRange = true;
        }
    }
    private void OnTriggerExit(Collider other)
    {
        if(other.tag == "Player")
        {
            playerInRange = false;
        }
    }
}