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

public class AlliesManager : MonoBehaviour
{

    public GameObject m_soldierPrefab;
    public GameObject[] m_spawnPoint;
    public GameObject[] m_soldierTargetLocation;
    public int m_soldierToSpawn = 4;
    public float m_timeSoldierStaysInPosition = 30f;// seconds
    public float m_delayBetweenSpawnPerSpawnPoint = 2f;
    private GameObject[] m_soldierList;
    private Dictionary<GameObject, DateTime> m_spawnLastTime = new Dictionary<GameObject, DateTime>();
    private int m_SoldierLeftToSpawn = 0;
    private int m_lastTargetIndex = 0;
    private List<GameObject> m_existingSoldiers = new List<GameObject>();
    private DateTime m_waveStartTime = DateTime.MinValue;

    // Start is called before the first frame update
    void Start()
    {
        //StartSupport();
    }

    public void StartSupport()
    {
        m_waveStartTime = DateTime.Now;
        m_SoldierLeftToSpawn += m_soldierToSpawn;
    }

    void TrySpawnSupport()
    {
        int indexForSpawn = m_lastTargetIndex % m_spawnPoint.Length;
        int indexForTarget =  m_lastTargetIndex % m_soldierTargetLocation.Length;
        if (!m_spawnLastTime.ContainsKey(m_spawnPoint[indexForSpawn]))// Init if it's the first time a spawn point is seen
        {
            m_spawnLastTime[m_spawnPoint[indexForSpawn]] = DateTime.MinValue;
        }
        double timeLeftForSpecificSpawn = (DateTime.Now - m_spawnLastTime[m_spawnPoint[indexForSpawn]]).TotalSeconds;
        if (timeLeftForSpecificSpawn > m_delayBetweenSpawnPerSpawnPoint)
        {
            m_spawnLastTime[m_spawnPoint[indexForSpawn]] = DateTime.Now;
            GameObject ally = Instantiate(m_soldierPrefab);
            ally.GetComponent<AlliesMovement>().targetPosition = m_soldierTargetLocation[indexForTarget];
            ally.GetComponent<AlliesMovement>().ExitPosition = m_spawnPoint[indexForSpawn];
            ally.GetComponent<NavMeshAgent>().Warp(m_spawnPoint[indexForSpawn].transform.position);
            m_existingSoldiers.Add(ally);
            m_SoldierLeftToSpawn--;
            m_lastTargetIndex++;
        }
    }

    void FixedUpdate()
    {
        if ((DateTime.Now - m_waveStartTime).TotalSeconds < m_timeSoldierStaysInPosition)
        {
            if (m_SoldierLeftToSpawn > 0)
            {
                TrySpawnSupport();
            }
        }
        else
        {// Replace the target location to the exit, then delete when they are close enough to the exit
            foreach(var ally in m_existingSoldiers)
            {
                AlliesMovement mov = ally.GetComponent<AlliesMovement>();
                if(mov.targetPosition != mov.ExitPosition)
                {
                    mov.targetPosition = mov.ExitPosition;
                } else
                {
                    if(Vector3.Distance(ally.transform.position, mov.ExitPosition.transform.position) < 1f)
                    {
                        m_existingSoldiers.Remove(ally);
                        Destroy(ally);
                    }
                }
            }
        }
    }
}