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

namespace Thousandto.Launcher.Form
{
    public class UIBackgroupPanelScript : MonoBehaviour
    {

        #region//常量
        //最大轮换图片数量
        private const int MAX_IMG_SHOW_COUNT = 3;
        private const string CN_IMAGE_FILE_EXT = ".jpg";
        #endregion

        #region//私有数据变量 
        private UISutureTextureData defaultTex = new UISutureTextureData();
        //组合纹理列表
        private List<UISutureTextureData> _imgShowList = new List<UISutureTextureData>();

        //图片所在的位置
        private string _imageShowPath = "ImgShow/imgshow_";

        #endregion

        #region //UI控件
        private UISutureTexture[] _uiTexrues;
        private Transform _trans;
        #endregion


        private void Awake()
        {
            OnInit();
        }


        // Start is called before the first frame update
        void Start()
        {
            OnFirstShow(transform);
            StartCoroutine(OnCycleShow());
        }

        public void OnDestroy()
        {

            for (int i = 0; i < _imgShowList.Count; ++i)
            {
                _imgShowList[i].UnLoad();
            }

            _imgShowList.Clear();
        }


        private void OnInit()
        {
            var lan = string.IsNullOrEmpty(UnityEngine.Gonbest.MagicCube.FLanguage.Default) ? "CH" : UnityEngine.Gonbest.MagicCube.FLanguage.Default;
            var pl = "Default";
            if (Application.platform == RuntimePlatform.IPhonePlayer)
            {
                pl = "IOS";
            }
            else if (Application.platform == RuntimePlatform.WebGLPlayer)
            {
                pl = "WEB";
            }
            else if (Application.platform == RuntimePlatform.Android)
            {
                pl = "Android";
            }
            _imageShowPath = string.Format("ImgShow/{0}/{1}/imgshow_", lan, pl);
            defaultTex.IsFromStreamFile = true;
            defaultTex.FileExt = CN_IMAGE_FILE_EXT;
            //加载默认
            defaultTex.Load("Default/Texture/UI/tex_launcher", null);
        }


        /// <summary>
        /// 第一次显示时调用
        /// </summary>
        /// <param name="tran"></param>
        private void OnFirstShow(Transform trans)
        {
            _trans = trans.Find("ImageList");
            _uiTexrues = _trans.GetComponentsInChildren<UISutureTexture>(true);
            for (int i = 0; i < _uiTexrues.Length; i++)
            {
                _uiTexrues[i].SetTexture(defaultTex);
            }

        }


        //循环展示
        public IEnumerator OnCycleShow()
        {
            yield return null;
            //加载所有的纹理
            for (int i = 1; i <= MAX_IMG_SHOW_COUNT; ++i)
            {
                var tex2D = new UISutureTextureData();
                tex2D.IsFromStreamFile = true;
                tex2D.FileExt = CN_IMAGE_FILE_EXT;
                tex2D.Load(_imageShowPath + i, x =>
                {
                    if (tex2D.IsValid)
                    {
                        _imgShowList.Add(tex2D);
                    }
                });
                yield return null;
            }

            //把UITexture的默认纹理也添加到imgshow中
            if (defaultTex.IsValid)
            {
                _imgShowList.Add(defaultTex);
            }

            yield return null;
            if (_uiTexrues.Length > 1 && _imgShowList.Count > 0)
            {
                int idx = 0;
                int cnt = _imgShowList.Count;
                bool showFirst = true;
                while (true)
                {
                    idx = GetIndex(idx, cnt);
                    if (!showFirst)
                    {
                        yield return null;
                        _uiTexrues[1].SetDepth(-6);
                        _uiTexrues[0].SetDepth(-5);
                        yield return null;
                        _uiTexrues[1].SetTexture(_imgShowList[idx]);
                        yield return null;
                    }
                    else
                    {
                        yield return null;
                        _uiTexrues[1].SetDepth(-5);
                        _uiTexrues[0].SetDepth(-6);
                        yield return null;
                        _uiTexrues[0].SetTexture(_imgShowList[idx]);
                        yield return null;
                    }
                    yield return new WaitForSeconds(2.5f);
                    showFirst = !showFirst;
                    idx++;

                }
            }
        }

        //获得索引
        private int GetIndex(int idx, int max)
        {
            return idx % max;
        }
    }
}