using NUnit.Framework.Constraints;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;


public class GameManager : MonoBehaviour
{
    public GameObject gameoverText;
    public Text timeText;
    public Text recordText;

    private float surviveTime;
    public bool isGameover;

    public GameObject restartButton;

    public static GameManager instance;

    public AudioSource leadAudio;
    public AudioSource deathAudio;

    public List<BulletSpawner> activeSpawners = new List<BulletSpawner>();
    public Transform player;
    public SpawnZone spawnZone;
    public GameObject spawnerPrefab;

    public void RegisterSpawner(BulletSpawner s) => activeSpawners.Add(s);
    public void UnregisterSpawner(BulletSpawner s) => activeSpawners.Remove(s);

    public int maxSpawnerCount = 2;

    public Transform rotationPlate;

    void Awake()
    {
        if (instance == null) instance = this;
    }

    void Start()
    {
        surviveTime = 0;
        isGameover = false;

        if (leadAudio != null) leadAudio.Play();
        if (deathAudio != null) deathAudio.Stop();
    }

    void Update()
    {
        if(!isGameover)
        {
            surviveTime += Time.deltaTime;
            timeText.text = "Time: " + (int)surviveTime;
        }
        else
        {
            if (Input.GetKeyDown(KeyCode.R))
            {
                RestartGame();
            }
            if (Input.GetMouseButtonDown(0))
            {
                RestartGame();
            }
        }

    }

    public float GetSurviveTime()
    {
        return surviveTime;
    }

    public void RestartGame()
    {
        UnityEngine.SceneManagement.SceneManager.LoadScene(1);
    }

    public void PlayDeathMusic()
    {
        if (leadAudio != null) leadAudio.Stop();
        if (deathAudio != null) deathAudio.Play();
    }

    public void EndGame()
    {
        isGameover = true;
        gameoverText.SetActive(true);
        restartButton.SetActive(true);

        float bestTime = PlayerPrefs.GetFloat("BestTime");
        if (surviveTime > bestTime)
        {
            bestTime = surviveTime;
            PlayerPrefs.SetFloat("BestTime", bestTime);
        }

        recordText.text = "Best Time: " + (int)bestTime;

    }

    public Vector3 GetValidSpawnPosition()
    {
        int maxAttempts = 10;
        for (int i = 0; i < maxAttempts; i++)
        {
            Vector3 candidate = spawnZone.GetRandomPosition();

          
            if (Vector3.Distance(candidate, player.position) < 5f) continue;

            bool isOverlap = false;
            foreach (var spawner in activeSpawners)
            {
                if (Vector3.Distance(candidate, spawner.transform.position) < 3f) 
                {
                    isOverlap = true;
                    break;
                }
            }

            if (!isOverlap) return candidate; 
        }
        return spawnZone.GetRandomPosition(); 
    }

    public void RequestRespawn()
    {
        StartCoroutine(RespawnRoutine());
    }

    IEnumerator RespawnRoutine()
    {
        yield return new WaitForSeconds(3f);

        Vector3 validPos = GetValidSpawnPosition();

        GameObject newSpawner = Instantiate(spawnerPrefab, validPos, Quaternion.identity);

        if (rotationPlate != null)
        {
            newSpawner.transform.SetParent(rotationPlate);
        }
    }

    public void UpdateMaxSpawnerCount(int newCount)
    {
        maxSpawnerCount = newCount;

        int currentCount = activeSpawners.Count;
        if (currentCount < maxSpawnerCount)
        {
            int needed = maxSpawnerCount - currentCount;
            for (int i = 0; i < needed; i++)
            {
                RequestRespawn();
            }
        }
    }
}