using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Pathfinding;
using SensorToolkit;
public class AiController : MonoBehaviour
{
    private enum AiState{
        Idle,
        Chasing,
        Searching,
    }
    private Character Character;
    [SerializeField]private Transform Player;
    [SerializeField]private AiState State;
    private Vector3 CurrentPos => Character.transform.position;
    [SerializeField]private RichAI Ai;
    [SerializeField]private StateText StateText;
    [SerializeField]private float distanceToNext;
    [SerializeField]private float distanceThreshold;
    [SerializeField]private float distanceToPlayer;
    [SerializeField]private float aggroRange;
    [SerializeField]private Transform lastSeenTransform;
    private Vector3 lastSeenPlayerPosition;
    private void Start(){
        Character = GetComponentInChildren<Character>();
        TransitionToState(State);
    }
    private void Update(){
        DistanceCheck();
        PostState();
        Character.HandleInputs(GetInputs());
    }
    private AICharacterInputs GetInputs(){
        AICharacterInputs inputs = new AICharacterInputs();
        inputs.GoalVector = GetNextPath();
        inputs.GoalVector.y= CurrentPos.y;
        inputs.LookVector = inputs.GoalVector - CurrentPos;
        inputs.LookVector.y = 0;
        return inputs;
    }
    private Vector3 GetNextPath(){
         switch (State){
            case AiState.Chasing:{
                lastSeenPlayerPosition = Player.transform.position;
                Ai.destination = Player.transform.position;
                Ai.SearchPath();
                return Ai.steeringTarget;
            }
            case AiState.Searching:{
                Ai.SearchPath();
                return Ai.steeringTarget;
            }
        }
        return Character.transform.position;
    }
    private void DistanceCheck(){
        distanceToNext = Vector3.Distance(Ai.destination,CurrentPos);
        distanceToPlayer = Vector3.Distance(Player.transform.position,CurrentPos);
        lastSeenTransform.position = lastSeenPlayerPosition;
    }
    private void PostState(){
        switch (State){
            case AiState.Searching:
            if(distanceToNext < distanceThreshold){
                TransitionToState(AiState.Idle);
            }
            break;
        }
    }
    public void PlayerSeen(){
        switch (State){
            case AiState.Searching:{
                TransitionToState(AiState.Chasing);
                break;
            }
            case AiState.Idle:{
                TransitionToState(AiState.Chasing);
                break;
            }
        }
    }
    public void PlayerLost(){
        lastSeenPlayerPosition = Player.transform.position;
        switch (State){
            case AiState.Chasing:{
                TransitionToState(AiState.Searching);
                break;
            }
        }

    }
    private void TransitionToState(AiState newState){
        State = newState;
        if(newState == AiState.Searching){
            Ai.destination = lastSeenPlayerPosition;
            Ai.SearchPath();
        }
        StateText.UpdateState(newState.ToString());
    }
}