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

namespace Thousandto.Core.Base
{
    /// <summary>
    /// 使用WWW来请求
    /// </summary>
    public class WWWFileRequest : IFileRequest
    {        
        //WWW
        private WWW _www = null;
        //错误信息
        private string _error = string.Empty;
        //路径
        private string _url = string.Empty;

        public WWWFileRequest(string url)
        {
            bool inAndroidPkg = false;
            RequestPathUtil.IsFileExists(url, out url,out inAndroidPkg);
            _url = url;
            //只有在Android,Iphone,Web下才会读取Cache.
            if (Application.platform == RuntimePlatform.Android 
                || Application.platform == RuntimePlatform.IPhonePlayer
                || Application.platform == RuntimePlatform.WebGLPlayer
                )
            {
                _www = WWWFactory.GetWWWFileCache(url, inAndroidPkg);
            }
            else
            {
                _www = WWWFactory.GetWWWFile(url, inAndroidPkg);
            }
            if (_www == null)
            {
                _error = string.Format("WWWFileRequest load failed! NOT EXIST File:{0}", url);
            }            
        }

        public float Progress
        {
            get {
                if (_www != null)
                {
                    return _www.progress;
                }
                return 0;
            }
        }

        public bool IsDone
        {
            get {
                if (_www != null)
                {
                    return _www.isDone;
                }
                return false;
            }
        }

        public string Error
        {
            get {
                if (_www != null)
                {
                    return _www.error;
                }
                else
                {
                    return _error;
                }
            }
        }

        public AssetBundle Bundle
        {
            get {
                if (_www != null)
                {
                    return _www.assetBundle;
                }
                return null;
            }
        }

        public void Dispose()
        {
            if (_www != null)
            {
                _www.Dispose();
                _www = null;
            }
        }

        public object Current
        {
            get {
                if (_www != null)
                {
                    return _www;
                }
                return _error;
            }
        }

        public bool MoveNext()
        {
            if (_www != null)
            {
                return !_www.isDone;
            }
            return false;
        }

        public void Reset()
        {
            
        }

        public IEnumerator GetEnumerator()
        {
            while (!IsDone)
            {
                yield return null;
            }
        }

        public IAssetRequest GetAssetRequest(string requestPath, Type assetType)
        {
            if (Bundle != null)
            {
                requestPath = RequestPathUtil.FixeRequestPath(requestPath);
                var bRequest = Bundle.LoadAssetAsync(requestPath);
                if (bRequest != null)
                {
                   return  new BundleAssetRequest(bRequest);
                }
            }
            return null;
        }
    }
}