using System;
using UnityEngine;

public class KitchenGameManager : MonoBehaviour
{
	public static KitchenGameManager Instance { get; private set; }
	public event EventHandler OnStateChanged;
	public event EventHandler OnGamePaused;
	public event EventHandler OnGameUnpaused;
	[SerializeField] private const float gamePlayingTimerMax = 120f;

	private enum State
	{
		WaitingToStart,
		CountdownToStart,
		GamePlaying,
		GameOver
	}

	private State state;
	public float CountdownToStartTimer { get; private set; } = 3f;
	public float GamePlayingTimer { get; private set; }
	private bool isGamePaused;

	private void Awake()
	{
		Instance = this;
		state = State.WaitingToStart;
		GamePlayingTimer = gamePlayingTimerMax;
	}

	private void Start()
	{
		GameInput.Instance.OnPauseAction += GameInput_OnPauseAction;
		GameInput.Instance.OnInteractAction += GameInput_OnInteractAction;
	}

	private void GameInput_OnPauseAction(object sender, System.EventArgs e)
	{
		TogglePauseGame();
	}

	private void GameInput_OnInteractAction(object sender, System.EventArgs e)
	{
		if (state == State.WaitingToStart)
		{
			state = State.CountdownToStart;
			OnStateChanged?.Invoke(this, System.EventArgs.Empty);
		}
	}

	public void TogglePauseGame()
	{
		isGamePaused = !isGamePaused;
		if (isGamePaused)
		{
			Time.timeScale = 0f;
			OnGamePaused?.Invoke(this, System.EventArgs.Empty);
		}
		else
		{
			Time.timeScale = 1f;
			OnGameUnpaused?.Invoke(this, System.EventArgs.Empty);
		}
	}

	private void Update()
	{
		switch (state)
		{
			case State.WaitingToStart:
				break;
			case State.CountdownToStart:
				CountdownToStartTimer -= Time.deltaTime;
				if (CountdownToStartTimer > 0f)
				{
					return;
				}

				state = State.GamePlaying;
				OnStateChanged?.Invoke(this, System.EventArgs.Empty);
				break;
			case State.GamePlaying:
				GamePlayingTimer -= Time.deltaTime;
				if (GamePlayingTimer > 0f)
				{
					return;
				}

				state = State.GameOver;
				GamePlayingTimer = gamePlayingTimerMax;
				OnStateChanged?.Invoke(this, System.EventArgs.Empty);
				break;
			case State.GameOver:
				break;
		}

		// Debug.Log(state);
	}

	public bool IsGamePlaying()
	{
		return state == State.GamePlaying;
	}

	public bool IsCountToStartActive()
	{
		return state == State.CountdownToStart;
	}

	public bool IsGameOver()
	{
		return state == State.GameOver;
	}

	public float GetGamePlayingTimerNormalized()
	{
		return 1 - (GamePlayingTimer / gamePlayingTimerMax);
	}
}