using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using UnityEngine;
using UnityEngine.InputSystem;

public class HerdController : MonoBehaviour
{

    [SerializeField]
    private GameObject Prefab;

    [SerializeField]
    private int HerdCount = 50;

    [SerializeField]
    private Transform SpawnPoint;

    [SerializeField]
    private float WaitTime;

    [SerializeField]
    private Transform Centre;

    private float lastTime;
    private List<PlayerController> Herd;
    private Vector2 recievedInput;

    public GameStateController GameState;

    void Start()
    {
        SpawnHerd();
    }

    //Recieved movement input from player
    private void OnMovement(InputValue value)
    {
        Vector2 input = value.Get<Vector2>();
        if (input.magnitude > 0)
            input = input.normalized;

        Herd.ForEach(p => p.SetMovement(input));
        recievedInput = input;
    }


    [ContextMenu("Spawn")]
    private void SpawnHerd()
    {
        float radius = 0;
        GameObject prefabExample = Instantiate(Prefab);
        Bounds bound = prefabExample.GetBounds();
        Debug.Log(bound.size);
        Destroy(prefabExample);

        if (Herd != null)
            Herd.ForEach(p => Destroy(p));
        Herd = new List<PlayerController>();

        for (int i = 0; i < HerdCount; i++)
        {



            int SpawnAttempt = 0;
            while (true)
            {

                Vector3 position = Vector3.ProjectOnPlane(Random.onUnitSphere, Vector3.up) * radius;
                Quaternion rotation = Quaternion.identity;
                if (SpawnPoint != null)
                    position += SpawnPoint.position;

                if (SpawnPositionValid(position, rotation, bound))
                {
                    GameObject newObject = Instantiate(Prefab, position, rotation, transform);

                    Herd.Add(newObject.GetComponent<PlayerController>());


                    break;
                }


                SpawnAttempt++;
                if (SpawnAttempt % 10 == 0)
                {
                    radius += bound.size.magnitude;
                }
                if (SpawnAttempt == 100)
                    break;
            }




        }
        Debug.Log("Total Spawned: " + Herd.Count);
    }

    public void FixedUpdate()
    {
        if (recievedInput.magnitude > 0 && lastTime + WaitTime < Time.time)
        {
            Herd.ForEach(p => p.MoveObject(WaitTime));
            lastTime = Time.time;

        }

        if (Centre != null)
            Centre.position = Herd.Aggregate(new Vector3(0, 0, 0), (s, v) => s + v.transform.position) / (float)Herd.Count;

        if (Herd.Count.Equals(0))
            GameState.LoseState();

    }

    public void RemoveHorse(PlayerController horse)
    {
        Herd.Remove(horse);
        Destroy(horse.gameObject);
    }


    private bool SpawnPositionValid(Vector3 position, Quaternion rotation, Bounds bound)
    {
        Collider[] colliders = Physics.OverlapBox(position, bound.extents, rotation);

        Debug.DrawLine(position, position + Vector3.up);

        foreach (Collider col in colliders)
        {
            if (col.GetComponentInChildren<PlayerController>())
                return false;
            if (col.GetComponentInParent<PlayerController>())
                return false;
        }

        return true;
    }








}