station_obscurum_unity/Assets/Scripts/Enemies/AI/SkinlessMonsterComponent.cs

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




public class SkinlessMonsterComponent : MonoBehaviour
{
    [SerializeField]
    private NavMeshAgent agent;
    [SerializeField]
    private SkinlessMonsterAnimator animator;
    private bool inDamageRange = false;
    private bool inDamageMargin = false;
    private bool atTarget = false;
    [SerializeField]
    private float atTargetDistance = 2;
    private TargetInformation target;

    [SerializeField]
    private float health = 2f;


    private bool isAlive = true;



    private Vector3 oppositeVector;

    private PlayerComponent player;
    private float distanceToPlayer;
    private FlareRegister flareRegister;
    [SerializeField]
    [Tooltip("This is the angle of visibility the enemy has")]
    private float visibilityConeLimit = 90f;
    [SerializeField]
    private float bulletSoundRange = 15f;

    private GameObject targetObject;
    [SerializeField]
    private float newTargetCooldown = 5f;
    private float timeSinceTarget = 0f;

    private InGameManager manager;
    private bool prePauseStoppedState = false;

    private void Awake()
    {
        //Find active player rn.
        PlayerComponent[] players = GameObject.FindObjectsOfType<PlayerComponent>();
        foreach (PlayerComponent p in players)
        {
            if (p.isActiveAndEnabled)
            {
                player = p;
            }
        }
        
        manager = GameObject.FindObjectOfType<InGameManager>();
    }

    private void Start()
    {
        flareRegister = GameObject.FindObjectOfType<FlareRegister>();
        if (targetObject == null)
            targetObject = new GameObject();
        targetObject.name = "Enemy Target";
        
        if(player == null)
        {
            player = GameObject.FindObjectOfType<PlayerComponent>();
        }
    }
    
    void HandleTargetOperations()
    {
        //Update booleans for movement
        float distToTarget = Vector3.Distance(target.target.transform.position, agent.transform.position);
        atTarget = atTargetDistance >= distToTarget;
        if (target.hasDamageRange)
        {
            inDamageRange = target.damageRange <= distToTarget;
            inDamageMargin = target.damageMargin + target.damageRange <= distToTarget;
        }
        else
        {
            inDamageRange = false;
            inDamageMargin = false;
        }
        //Perform actions.
        if (target.runTowards)
        {
            if (inDamageRange)
            {
                //Damage is being dealt
                animator.InLight();
                //Deal Damage
                health -= Time.deltaTime;
                if (health < 0 && this.isAlive)
                {
                    this.Kill();
                }

            }
            else if (inDamageMargin)
            {
                //Effective stop
                agent.SetDestination(transform.position);
                animator.StopMoving();

            }
            else
            {
                if (atTarget)
                {
                    //Effective stop
                    agent.SetDestination(transform.position);
                    animator.StopMoving();
                    if (target.isHostile)
                    {
                       
                        animator.Attack();
                        animator.SetAttackType(Random.Range(0, 0));
                            
                        
                        
                        
                    }

                }
                else
                {
                    agent.SetDestination(target.target.transform.position);
                    animator.StartMoving();
                    animator.NotInLight();
                }

            }
        }
        else
        {
            //Run away logic
            if (atTarget || distToTarget < 3)
            {
                animator.StopMoving();
            }
            else
            {
                Ray r = new Ray();
                r.origin = transform.position;
                r.direction = oppositeVector;
                RaycastHit hit;
                if (Physics.Raycast(r, out hit))
                {

                    animator.StartMoving();
                    agent.SetDestination(hit.point);
                }
                else
                {

                    agent.SetDestination(transform.position + oppositeVector * 100);
                    agent.isStopped = false;
                }
            }

        }

        if (atTarget&&target.isHostile)
        {
            SlowLookAt(target.target.transform.position-transform.position);  
        }
    }
    void SlowLookAt(Vector3 targetVector,float animatedRotationSpeed=1f)
    {
        Vector3 relativePos = targetVector;
        Quaternion toRotation = Quaternion.LookRotation(relativePos);

        transform.rotation = Quaternion.Lerp(transform.rotation, toRotation, animatedRotationSpeed * Time.deltaTime);

    }

    void CheckForAOERanges()
    {
        foreach(BulletComponent bullet in flareRegister.bullets)
        {
            float dist = Vector3.Distance(bullet.transform.position, transform.position);
            if (dist <= bullet.DamageRange)
            {
                this.health = 0;
                this.Kill(true);
            }
        }
        foreach(FlareBeacon beacon in flareRegister.beacons)
        {
            float dist = Vector3.Distance(beacon.transform.position, transform.position);
            if (dist <= beacon.Range)
            {
                this.health = 0f;
                
            }
        }
        if (this.health <= 0)
        {
            this.Kill();
        }
    }

    public bool isPlayerVisible(bool withAngle)
    {
        Ray r = new Ray();
        r.origin = transform.position;
        r.direction = player.transform.position - transform.position;
        Vector3 toPosition = (player.transform.position - transform.position).normalized;
        float angleToPosition = Vector3.Angle(transform.forward, toPosition);
        
        
        RaycastHit hit;
        if(Physics.Raycast(r, out hit))
        {
            
            GameObject hitObject = hit.transform.gameObject;
            
            if (hitObject.GetComponent<PlayerComponent>() != null)
            {
                //hit player
                return angleToPosition <= this.visibilityConeLimit||!withAngle;
                
            }else if (hitObject.GetComponentInParent<PlayerComponent>() != null)
            {
                //also hit player
                return angleToPosition <= this.visibilityConeLimit||!withAngle;
            }
            
        }
        return false;
    }

    void SetLiveTargeting()
    {
        if (!isAlive)
        {
            //this.targetObject.transform.position = transform.position;
            this.Stop();
        }

        distanceToPlayer = Vector3.Distance(this.transform.position, player.transform.position);
        //print("Dist Comparison "+distanceToPlayer.ToString()+" Noise:"+player.NoiseManager.NoiseDistance);
        bool isPlayerVisible = this.isPlayerVisible(true);
        //check if player is heard or player line of sight
        if (distanceToPlayer <= player.NoiseManager.NoiseDistance||isPlayerVisible)
        {
            //check that nothing in between
            if (this.isPlayerVisible(false))
            {
                this.Target(player.gameObject, true);
            }
            
        }
        else
        {
            if (this.timeSinceTarget < this.newTargetCooldown)
            {
                //no further targeting
                //Stop();
                return;
            }
            
            BulletComponent closestBullet = null;
            float closestDistance = Mathf.Infinity;
            foreach(BulletComponent bullet in this.flareRegister.bullets)
            {
                float bDist = Vector3.Distance(bullet.transform.position, transform.position);
                if (closestBullet==null||(bDist< bulletSoundRange&&bDist<closestDistance))
                {
                    closestBullet = bullet;
                    closestDistance = bDist;
                }
            }
            if (closestBullet != null&&closestBullet.DamageRange==0)
            {
               
                targetObject.transform.position= closestBullet.transform.position;
                this.Target(targetObject,false);
            }
            else
            {

                targetObject.transform.position = transform.position;
                this.Target(targetObject,false);
                this.Stop();
            }
        }
    }

    private void Update()
    {
        if (!player.IsAlive)
        {
            Stop();
        }
        
        if (target != null)
        {
            HandleTargetOperations();
        }
        CheckForAOERanges();
        if(isAlive&&player.IsAlive)
            SetLiveTargeting();
        timeSinceTarget += Time.deltaTime;

        

        /*
            AI Behavior:
            A. If not targeting player
                1. Get distance to player
                    - if distance < player.NoiseDistance then target player.
                2. Raycast to player to test line of sight
                    - if in line of sight and angle between LOS vector and forward vector is < LOF margin, then
                    target player.
            B. If targeting player
                1. If out of sound range and no line of sight then lose target.
                    - stop()
                2. If beacon placed down and in range
                    - remove agent
                    - kill()
                3. If beacon placed down and in margin:
                    - stop() and wait for player to leave AOE (enforced by navigation).
         */
    }
    /*
    STANDARD BEHAVIOR:
        - OnSeeing/Hearing Player:
            - Run towards Player
        - OnHearing Bolt:
            - Run towards bolt
        - OnSeeing Flare:
            - Run towards flare if not within (flareRange + flareMargin).
                - This acts like if you are far enough away that you don't feel the pain of the flare
        - OnSeeing FlareBeacon:
            - Run away if within (flareBeaconRange + flareBeaconMargin).
       
     */

    //Runs towards target. If its meant to be hostile, it will melee attack once in range.
    public void Target(GameObject obj,bool hostile=false)
    {
        if(target == null || target.target!= obj)
        {
            //target = new TargetInformation(obj,hostile,false,runTowards:true);
            target = new TargetInformation();
            target.target = obj;
            target.isHostile = hostile;
            target.hasDamageRange = false;
            target.runTowards = true;
            timeSinceTarget = 0;
            
        }
    }
    //Runs towards flare such that it stops randomly within margin before range.
    public void TargetFlare(GameObject obj,float range,float margin)
    {
        if(target == null || target.target != obj)
        {
            //target = new TargetInformation(obj, false, true, range, margin,runTowards:true);
            target = new TargetInformation();
            target.target = obj;
            target.isHostile = false;
            target.hasDamageRange = true;
            target.damageRange = range;
            target.damageMargin = margin;
            target.runTowards = true;
            timeSinceTarget = 0;
        }
    }
    /// <summary>
    /// Runs away from object. A minimum range is specified where it no longer takes damage, and a minimum margin is
    /// speicifed where it can stop running.
    /// </summary>
    /// <param name="obj"></param>
    /// <param name="minRange"></param>
    /// <param name="minMargin"></param>
    public void RunAwayFrom(GameObject obj,float minRange,float minMargin) {
        if(target== null ||target.target != obj)
        {
            //target = new TargetInformation(obj, false, true, minRange, minMargin, false);
            target = new TargetInformation();
            target.target = obj;
            target.isHostile = false;
            target.hasDamageRange = true;
            target.damageRange = minRange;
            target.damageMargin = minMargin;
            target.runTowards = false;
            oppositeVector = -(target.target.transform.position - transform.position).normalized;
            timeSinceTarget = 0;
        }
    }

    public void Stop()
    {
        target = new TargetInformation();
        target.target = this.gameObject;
        target.isHostile = false;
        target.hasDamageRange = false;
        target.runTowards = true;
        
    }

    public void Kill(bool fast=false)
    {
        if (this.isAlive)
        {
            this.animator.Kill(fast);
            this.isAlive = false;
            agent.isStopped = true;
            
        }

    }
    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.GetComponent<BulletComponent>() != null)
        {
            
            this.health -= other.gameObject.GetComponent<BulletComponent>().DamageMagnitude;
        }
    }

  

}
class TargetInformation
{

    public GameObject target;
    public bool isHostile;
    public bool hasDamageRange;
    public float damageRange;
    public float damageMargin;
    public bool runTowards;

}