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

public class RawImageController : MonoBehaviour
{

    public string Name;
    public List<Texture2D> Images = new List<Texture2D>();
    private List<Texture2D> TempImages = new List<Texture2D>();

    private string ImagePath = Application.streamingAssetsPath + "\\Data\\测试数据\\智慧党建\\图片\\";
    private int CurrentIndex = 0;
    private RawImage RawImage;
    private string path;

    void Start()
    {
        path = ImagePath + Name;
        RawImage = transform.GetChild(0).GetComponent<RawImage>();

        transform.Find("L_Button").GetComponent<Button>().onClick.AddListener(() =>
        {
            ImageController(-1);
        });
        transform.Find("R_Button").GetComponent<Button>().onClick.AddListener(() =>
        {
            ImageController(1);
        });

        ChartDataUpdateController.Inst.ChartUpdateAction += ImageDataUpate;
        ImageDataUpate();
    }

    private void ImageController(int index)
    {
        if (Images.Count == 0)
            return;
        CurrentIndex += index;
        int i = CurrentIndex % Images.Count;

        if (i < 0)
        {
            ImageUpdate(Images.Count + i);
        }
        else if (i > 0)
        {
            ImageUpdate(i);
        }
        else
        {
            ImageUpdate(0);
        }
    }

    private void ImageDataUpate()
    {
        // string[] files = Directory.GetFiles(path, "*", SearchOption.AllDirectories);
        WebRequsetTool.Inst.Get(path + "\\Images.txt", (str) =>
        {
            TempImages.Clear();
            string[] files = str.Split("\r\n");

            foreach (string file in files)
            {
                // Images.Add(GetTextureByString(SetImageToString(file)));
                WebRequsetTool.Inst.GetTexture(path + "\\" + file, (texture) =>
                {
                    TempImages.Add(texture);
                    Images = TempImages;
                    ImageController(0);
                });
            }
        });
    }

    private void ImageUpdate(int i)
    {
        RawImage.texture = Images[i];
    }

    /// <summary>
    /// 将图片转化为字符串
    /// </summary>
    private string SetImageToString(string imgPath)
    {
        FileStream fs = new FileStream(imgPath, FileMode.Open);
        byte[] imgByte = new byte[fs.Length];
        fs.Read(imgByte, 0, imgByte.Length);
        fs.Close();
        return Convert.ToBase64String(imgByte);
    }

    /// <summary>
    /// 将字符串转换为纹理
    /// </summary>
    private Texture2D GetTextureByString(string textureStr)
    {
        Texture2D tex = new Texture2D(1, 1);
        byte[] arr = Convert.FromBase64String(textureStr);
        tex.LoadImage(arr);
        tex.Apply();
        return tex;
    }


    void Update()
    {

    }
}