using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class GameManager : MonoBehaviour
{
    public PlayerData data;
    int score;

    public GameObject losePanel;
    public GameObject _effect;
    Scene scene;

    Text scoreText;
    Text finalScoreText;
    Button restartButton;
    Button mainMenuButton;
    ColorCycler colorCycler;

    private static GameManager _instance;
    public static GameManager Instance {
        get {
            if(_instance == null) {
                GameObject go = new GameObject("GameManager");
                go.AddComponent<GameManager>();
            }

            return _instance;
        }
    }

    void Awake() {
        _instance = this;
    }

    void Start()
    {
        scene = SceneManager.GetActiveScene();
        colorCycler = FindObjectOfType<ColorCycler>().GetComponent<ColorCycler>();
        if(Time.timeScale < 1) {
            Time.timeScale = 1;
        }
        scoreText = GameObject.Find("ScoreText").GetComponent<Text>();
        scoreText.text = score.ToString();
    }

    public void Score() {
        score += 2;
        scoreText.text = score.ToString();

        if((score % 2) == 0 && GameObject.Find("Spawner").GetComponent<EnemySpawner>().spawnSpeed > 0.4) {
            GameObject.Find("Spawner").GetComponent<EnemySpawner>().spawnSpeed -= 0.15f;
            Debug.Log(GameObject.Find("Spawner").GetComponent<EnemySpawner>().spawnSpeed);
        }

        if((score % 5) == 0) {
            colorCycler.ChangeColor();
        }
    }

    public void Die() {

        // if() { ADD HEALT SYSTEM
            GameObject.Find("Spawner").GetComponent<EnemySpawner>().isSpawning = false;
            scoreText.gameObject.SetActive(false);
            
            DestroyAllNPC();

            var createPanel = Instantiate(losePanel) as GameObject;
            createPanel.transform.SetParent(GameObject.Find("Canvas").gameObject.transform, false);
            finalScoreText = createPanel.gameObject.transform.GetChild(0).GetComponent<Text>();
            restartButton = createPanel.gameObject.transform.GetChild(1).GetComponent<Button>();
            restartButton.onClick.AddListener(() => { GameObject.Find("TransitionEffect").GetComponent<SceneChanger>().ChangeScenePublicFunction(scene.name); });
            mainMenuButton = createPanel.gameObject.transform.GetChild(2).GetComponent<Button>();
            mainMenuButton.onClick.AddListener(() => { GameObject.Find("TransitionEffect").GetComponent<SceneChanger>().ChangeScenePublicFunction("MainMenu"); });

            switch (scene.name)
            {
                case "Game":
                    if(data.highScore < score) {
                        data.highScore = score;
                    } else {
                        score = data.highScore;
                    }
                    finalScoreText.text = "Score : " + score + "\nHighscore : " + data.highScore;
                    break;
                case "Hardcore":
                    if(data.highScore < score) {
                        data.highScoreHC = score;
                    } else {
                        score = data.highScoreHC;
                    }
                    finalScoreText.text = "Score : " + score + "\nHighscore : " + data.highScoreHC;
                    break;
            }
        //}
    }

    IEnumerator WaitForTimeScale() {
        yield return new WaitForSeconds(0.5f);
        Time.timeScale = 0f;
    }

    public void Restart() {
        SceneManager.LoadScene("Game");
    }

    void DestroyAllNPC()  {
        var npcs = FindObjectsOfType<Enemy>();
        foreach (var npc in npcs)
        {
            CreateParticles(npc.gameObject);
            Destroy(npc.gameObject);
        }
    }

    public void CreateParticles(GameObject obj) {
        var tempPos = obj.gameObject.transform.localPosition;
        var createEffect = Instantiate(_effect) as GameObject;
        createEffect.gameObject.transform.position = tempPos; // Move ParticleSystem to same pos as enemy
        createEffect.transform.SetParent(GameObject.Find("ParticleCanvas").gameObject.transform, false);
        var effColor = createEffect.GetComponent<ParticleSystem>().main;
        effColor.startColor = obj.GetComponent<Image>().color;
        createEffect.GetComponent<ParticleSystem>().Play();
    }
}