using Cedar.Core.Coroutines;
using HtmlAgilityPack;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.Networking;

public enum LoaderStatus
{
	Initializing,
	Ready,
	Error
}

public class ImageLoader
{
	private bool ready = false;
	private string errorMessage;
	private string url;
		
	public LoaderStatus Status
	{
		get
		{
			if (!ready) return LoaderStatus.Initializing;
			if (string.IsNullOrEmpty(errorMessage)) return LoaderStatus.Ready;
			return LoaderStatus.Error;
		}
	}

	public List<string> images;

	public ImageLoader(string url)
	{
		this.url = url;
		CoroutineRunner.Instance.StartCoroutine(OnUrlUpdated());
	}

	private IEnumerator OnUrlUpdated()
	{
		errorMessage = null;
		var request = UnityWebRequest.Get(url);
		yield return request.SendWebRequest();
		if (request.isNetworkError || request.isHttpError)
		{
			errorMessage = request.error;
			ready = true;
			yield break;
		}
		var responseText = request.downloadHandler.text;
		var doc = new HtmlDocument();
		doc.LoadHtml(responseText);
		var nodes = doc.DocumentNode.SelectNodes("//a[preceding-sibling::img[@alt=\"[IMG]\"]]");
		images = new List<string>();
		foreach (var node in nodes)
		{
			var target = node.GetAttributeValue("href", "");
			images.Add(url + "/" + target);
		}
		ready = true;
		request.Dispose();
	}
}