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

[RequireComponent(typeof(NavMeshAgent))]
public class MovementController : MonoBehaviour
{
    public int PointStartID { get; set; }
    public int PointEndID { get; private set; }
    public float FlagDistance { get; private set; }
    private const float updateFlagPositionDelay = 5;
    private const float updateReachedDestinationDelay = 5;

    [SerializeField] private NavMeshAgent navMeshAgent;
    [SerializeField] private GameObject flag;
    public float DistanceToGo { get; private set; }
    public float RemainingDistance => navMeshAgent.remainingDistance;
    private Dictionary<int, NavPoint> idNavPointDict;


    private void Awake()
    {
        navMeshAgent.speed = SettingsReader.Instance.GetSettings.MovementSpeed;
        idNavPointDict = MapManager.IDToNavPoint;
        InvokeRepeating(nameof(UpdateFlagPosition), 0, updateFlagPositionDelay);
        InvokeRepeating(nameof(ReachedDestination), 0, updateReachedDestinationDelay);
    }
   
    private void OnDestroy()
    {
        CancelInvoke(nameof(UpdateFlagPosition));
    }

    private void UpdateFlagPosition()
    {
        FlagDistance = (flag.transform.position - gameObject.transform.position).magnitude;
    }

    public void MoveToPointById(int id)
    {
        if (!navPoints.ContainsKey(id))
        {
            Debug.LogWarning("PIDOR");
            return;
        }
        goToNextNavPoint(navPoints[id]);
    }
    
    public void MoveToRandomPoint()
    {
        GoToNextNavPoint(MapManager.NavPoints[Random.Range(0, MapManager.NavPoints.Count)]);
    }

    public List<NavPoint> GetPointsCandidate()
    {
        return MapManager.NavPoints
            .Where(point => 
            (idNavPointDict[PointStartID].Position - point.Position).magnitude < SettingsReader.Instance.GetSettings.MovementDistance)
            .ToList();
    }

    public void GoToNextNavPoint(NavPoint destination)
    {
        if (navMeshAgent.isStopped == true) navMeshAgent.isStopped = false;
        PointStartID = PointEndID;
        PointEndID = destination.PointId;
        navMeshAgent.SetDestination(destination.Position);
        DistanceToGo = navMeshAgent.remainingDistance;      
    }

    public void ReturnToStartPoint()
    {
        if (navMeshAgent.isStopped == true) navMeshAgent.isStopped = false;
        navMeshAgent.SetDestination(idNavPointDict[PointStartID].Position);
        PointEndID = PointStartID;
        PointStartID = -1;
    }

    public void StopOnPath()
    {
        navMeshAgent.isStopped = true;
        PointStartID = -1;
        PointEndID = -1;
    }

    public void ReachedDestination()
    {
        if ((navMeshAgent.isStopped == false) && (navMeshAgent.velocity.magnitude < 0.1))
            PointStartID = PointEndID;
    }
}