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

public class UiBgLoaderV2 : MonoBehaviour
{
    public string texturePath;

    private void OnTextureLoad(Texture2D texture)
    {
        var rawImage = GetComponent<RawImage>();
        var image = GetComponent<Image>();
        if (rawImage)
        {
            if (texture)
            {
                rawImage.enabled = true;
                rawImage.texture = texture;
            }
            else
                rawImage.enabled = false;
        }
        if (image)
        {
            if (texture)
            {
                image.enabled = true;
                image.sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), Vector2.one * 0.5f);
            }
            else
                image.enabled = false;
        }
        if (texture)
        {
            var rectTransform = (RectTransform)transform;
            var canvasRoot = (RectTransform)rectTransform.root;
            var screenSize = canvasRoot.sizeDelta;
            var ratio = Mathf.Max(screenSize.x / texture.width, screenSize.y / texture.height);
            rectTransform.sizeDelta = new Vector2(texture.width, texture.height) * ratio;
        }
        else
            Debug.LogError("Failed to Load Texture for Bg: " + texturePath);
    }

    private IEnumerator LoadTexture()
    {
        var filePath = Application.streamingAssetsPath.Open(texturePath);
#if UNITY_IPHONE || UNITY_IOS
        filePath = "file://" + filePath;
#endif
        var www = new WWW(filePath);
        yield return www;
        var texture = string.IsNullOrEmpty(www.error) ? www.texture : null;
        OnTextureLoad(texture);
    }

    private void Start()
    {
        if (!string.IsNullOrEmpty(texturePath))
            StartCoroutine(LoadTexture());
    }
}