/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
 * copy, modify, and distribute this software in source code or binary form for use
 * in connection with the web services and APIs provided by Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use of
 * this software is subject to the Facebook Developer Principles and Policies
 * [http://developers.facebook.com/policy/]. This copyright notice shall be
 * included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

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

public class Menu : MonoBehaviour
{
    [SerializeField]
    private Button _backBtn;
    [SerializeField]
    private Sprite _mutedSprite;
    [SerializeField]
    private Sprite _volumeSprite;
    [SerializeField]
    private Image _mutedBtnImg;
    [SerializeField]
    private AudioSource _bgMusic;
    [SerializeField]
    private GameObject _pages;

    private GameObject _currentPage;
    private LogScroller _logScroller;
    private bool _muted;
    private Stack<GameObject> _pagesStack = new Stack<GameObject>();

    private void Awake()
    {
        _logScroller = transform.root.GetComponent<UIState>().logScroller;

        _muted = PlayerPrefs.GetInt("muted", 0) > 0 ? true : false;
        _SetMuteBtnIcon();

        // deactivate all pages and set first page as active
        foreach (Transform child in _pages.transform)
        {
            child.gameObject.SetActive(false);
        }
        _currentPage = _pages.transform.GetChild(0).gameObject;
        _currentPage.SetActive(true);
    }

    public void NavToPage(string pageName)
    {
        GameObject target = _FindChild(_pages.transform, pageName);
        // _LogText(pageName + " " + !!target);
        if (target != null)
        {
            _currentPage.SetActive(false);
            _pagesStack.Push(_currentPage);
            _currentPage = target;
            target.SetActive(true);
            _backBtn.interactable = true;
        }
        else
        {
            _LogText("ERR: Missing page '" + pageName + "'");
        }
    }
    public void OnBackBtnClick()
    {
        if (_pagesStack.Count > 0)
        {
            _currentPage.SetActive(false);
            GameObject target = _pagesStack.Pop();
            _currentPage = target;
            target.SetActive(true);

            if (_pagesStack.Count == 0)
            {
                _backBtn.interactable = false;
            }
        }
        else
        {
            _LogText("ERR: On last page?");
        }
    }
    public void OnToggleMuteBtnClick()
    {
        _muted = !_muted;
        PlayerPrefs.SetInt("muted", _muted ? 1 : 0);
        _SetMuteBtnIcon();
    }

    // private
    private GameObject _FindChild(Transform target, string name)
    {
        foreach (Transform child in target)
        {
            if (child.gameObject.name == name)
            {
                return child.gameObject;
            }
        }
        return null;
    }
    private void _LogText(string text)
    {
        _logScroller.Log(text);
    }
    private void _SetMuteBtnIcon()
    {
        Sprite targetSprite = _muted ? _mutedSprite : _volumeSprite;

        _mutedBtnImg.sprite = targetSprite;
        _bgMusic.mute = _muted;
    }
}