using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using SHADE;

public class AIPrototype : Script
{
  //This object's relevant components
  private Transform transform;
  private RigidBody rb;

  /*[SerializeField]
  [Tooltip("The list of waypoints that the object will move around on")]
  private Vector3[] waypoints;*/

  private Vector3[] waypoints = { new Vector3(-8.0f, -2.0f, 3.5f), new Vector3(-8.0f, -2.0f, -13.0f), new Vector3(8.0f, -2.0f, -13.0f), new Vector3(8.0f, -2.0f, 3.5f) };

  [SerializeField]
  [Tooltip("How much force is applied in movement")]
  private float movementForceMultiplier = 100.0f;

  [SerializeField]
  [Tooltip("How fast the object moves about waypoints")]
  private float patrolSpeed = 0.4f;

  [SerializeField]
  [Tooltip("How fast the object moves while chasing")]
  private float chaseSpeed = 0.8f;

  [SerializeField]
  [Tooltip("How near the player must be to the AI for capture")]
  private float distanceToCapture = 1.2f;

  [SerializeField]
  [Tooltip("How near the player must be for the chase to begin. Should be less than distanceToEndChase")]
  private float distanceToStartChase = 2.0f;

  [SerializeField]
  [Tooltip("How far the player must be for the chase to end. Should be greater than distanceToStartChase")]
  private float distanceToEndChase = 2.5f;

  //Whether the AI is chasing or not
  private bool chaseMode;

  //To cycle depending on the length of waypoints
  private int currentTargetWaypointIndex;

  private GameObject? player;

  public AIPrototype(GameObject gameObj) : base(gameObj) { }

  protected override void awake()
  {
    transform = GetComponent<Transform>();
    if (transform == null)
    {
      Debug.LogError("Transform is NULL!");
    }

    rb = GetComponent<RigidBody>();
    if (rb == null)
    {
      Debug.LogError("Rigidbody is NULL!");
    }

    currentTargetWaypointIndex = 0;

    player = GameObject.Find("Player");
    if (player == null)
    {
      Debug.LogError("Player is NULL!");
    }

    chaseMode = false;
  }

  protected override void fixedUpdate()
  {
    //Patrolling
    if (!chaseMode)
    {
      //Head towards the next target
      Vector3 normalisedDifference = waypoints[currentTargetWaypointIndex] - transform.GlobalPosition;
      normalisedDifference /= normalisedDifference.GetMagnitude();

      //transform.GlobalPosition += normalisedDifference * moveSpeed * (float)Time.DeltaTime;
      //rb.LinearVelocity = normalisedDifference * patrolSpeed;

      //ORIGINAL INTENDED CODE
      /*rb.AddForce(new Vector3(normalisedDifference.x, 0.0f, normalisedDifference.z) * movementForceMultiplier);
      float currentSpeed = MathF.Sqrt(rb.LinearVelocity.x * rb.LinearVelocity.x + rb.LinearVelocity.z * rb.LinearVelocity.z);
      if (currentSpeed > patrolSpeed)
      {
        float adjustmentFactor = patrolSpeed / currentSpeed;
        Vector3 adjustedVelocity = rb.LinearVelocity;
        //adjustedVelocity *= adjustmentFactor;
        adjustedVelocity.x = patrolSpeed;
        adjustedVelocity.z = patrolSpeed;
        rb.LinearVelocity = adjustedVelocity;
      }*/

      //TODO delete this when original intended code above works with velocity being limited correctly
      rb.LinearVelocity = normalisedDifference * patrolSpeed;

      //transform.GlobalRotation.SetLookRotation(waypoints[currentTargetWaypointIndex], Vector3.Up);

      //Cycle to next waypoint if near enough current waypoint
      if ((waypoints[currentTargetWaypointIndex] - transform.GlobalPosition).GetSqrMagnitude() <= 0.5f)
      {
        ++currentTargetWaypointIndex;
        if (currentTargetWaypointIndex >= waypoints.Length)
        {
          currentTargetWaypointIndex = 0; //Recycle
        }
      }

      //Go chase if near enough to player
      if (player != null)
      {
        Transform pTransform = player.GetValueOrDefault().GetComponent<Transform>();
        if ((pTransform.GlobalPosition - transform.GlobalPosition).GetMagnitude() <= distanceToStartChase)
        {
          //Start the chase
          chaseMode = true;
        }
      }
    }
    else //Chasing
    {
      if (player != null)
      {
        Transform pTransform = player.GetValueOrDefault().GetComponent<Transform>();

        //Chase the player
        Vector3 normalisedDifference = pTransform.GlobalPosition - transform.GlobalPosition;
        normalisedDifference /= normalisedDifference.GetMagnitude();

        //transform.GlobalPosition += normalisedDifference * moveSpeed * (float)Time.DeltaTime;

        //ORIGINAL INTENDED CODE
        /*rb.AddForce(new Vector3(normalisedDifference.x, 0.0f, normalisedDifference.z) * movementForceMultiplier);
        float currentSpeed = MathF.Sqrt(rb.LinearVelocity.x * rb.LinearVelocity.x + rb.LinearVelocity.z * rb.LinearVelocity.z);
        if (currentSpeed > chaseSpeed)
        {
          float adjustmentFactor = chaseSpeed / currentSpeed;
          Vector3 adjustedVelocity = rb.LinearVelocity;
          adjustedVelocity *= adjustmentFactor;
          rb.LinearVelocity = adjustedVelocity;
        }*/

        //TODO delete this when original intended code above works with velocity being limited correctly
        rb.LinearVelocity = normalisedDifference * chaseSpeed;

        //Capture player if near enough
        if ((pTransform.GlobalPosition - transform.GlobalPosition).GetMagnitude() <= distanceToCapture)
        {
          player.GetValueOrDefault().GetScript<PlayerController>().currentState = PlayerController.RaccoonStates.CAUGHT;
        }

        //End chase if too far
        if ((pTransform.GlobalPosition - transform.GlobalPosition).GetMagnitude() >= distanceToEndChase)
        {
          //Stop the chase
          chaseMode = false;

          //Find the nearest waypoint to go instead
          float nearestWaypointDistance = 99999999999999.9f;
          for (int i = 0; i < waypoints.Length; ++i)
          {
            if ((waypoints[i] - transform.GlobalPosition).GetSqrMagnitude() < nearestWaypointDistance)
            {
              nearestWaypointDistance = waypoints[i].GetSqrMagnitude();
              currentTargetWaypointIndex = i;
            }
          }
        }
      }
    }
  }
}