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

public class UIBGImageChange : MonoBehaviour
{
    public bool _AutoFitSize;
    public string _ResPath;

    private void OnEnable()
    {
        InitImg();
    }

    protected virtual void InitImg()
    {
        ChangeRes(_ResPath);
    }

    protected void ChangeRes(string imgPath)
    {
        var rawImage = GetComponent<RawImage>();
        if (rawImage != null)
        {
            rawImage.enabled = false;
            StartCoroutine(SetTexture(rawImage, imgPath));
        }

        var image = GetComponent<Image>();
        if (image != null)
        {
            image.enabled = false;
            StartCoroutine(SetTexture(image, imgPath));
        }
    }

    private IEnumerator SetTexture(RawImage rawImage, string path)
    {
        var filePath = Application.streamingAssetsPath + "/" + path;
#if UNITY_IPHONE || UNITY_IOS
        filePath = "file://" + filePath;
#endif
        //Debug.LogError("LoadLocalImage:" + filePath);
        var www = new WWW(filePath);
        yield return www;
        if (!string.IsNullOrEmpty(www.error))
        {
            Debug.LogError("LoadImageError: " + www.error + "\n" + path);
            rawImage.enabled = false;
        }
        else
        {
            rawImage.enabled = true;
            var texture = www.texture;
            rawImage.texture = texture;
            if (_AutoFitSize)
                rawImage.rectTransform.sizeDelta = new Vector2(texture.width, texture.height);
        }
    }

    private IEnumerator SetTexture(Image image, string path)
    {
        var filePath = Application.streamingAssetsPath + "/" + path;
#if UNITY_IPHONE || UNITY_IOS
        filePath = "file://" + filePath;
#endif
        var www = new WWW(filePath);
        yield return www;
        if (!string.IsNullOrEmpty(www.error))
        {
            Debug.LogError("LoadImageError: " + www.error + "\n" + path);
            image.enabled = false;
        }
        else
        {
            image.enabled = true;
            image.sprite = Sprite.Create(www.texture, new Rect(0, 0, www.texture.width, www.texture.height),
                new Vector2(0.5f, 0.5f));
            if (_AutoFitSize) image.rectTransform.sizeDelta = new Vector2(www.texture.width, www.texture.height);
        }
    }
}