using System;
using System.Text;
using System.Collections;
using UnityEngine;
using UnityEngine.Networking;


namespace BF
{
    public enum EDownloadCode
    {
        SUCCESS = 1,
        ERROR,
    }

    public class BFWebRequestManager : ManagerBase
    {
        static BFWebRequestManager instance;

        BFWebRequestManager() { }

        public static BFWebRequestManager Create()
        {
            BFLog.LogAssert(instance == null, "This method only allows BFMain to call once");
            instance = new BFWebRequestManager();
            return instance;
        }

        public override void SetMono(MonoBehaviour mono)
        {
            base.SetMono(mono);
        }

        public override void Init()
        {
        }

        public UnityWebRequest CreateWebRequest(string url, string method, int timeout)
        {
            var uniWebRequest = new UnityWebRequest(url, method, new DownloadHandlerBuffer(), null);
            uniWebRequest.timeout = timeout;
            return uniWebRequest;
        }

        public void Get(string url, Action<EDownloadCode, UnityWebRequest> callback, int timeout = 0)
        {
            var uniWebRequest = CreateWebRequest(url, UnityWebRequest.kHttpVerbGET, timeout);
            var webRequest = uniWebRequest.SendWebRequest();
            webRequest.completed += (operation) =>
            {
                GetRequestComplete(uniWebRequest, callback);
            };
        }

        /// <summary>
        /// post data to remote
        /// </summary>
        /// <param name="fields">fieldname1|fieldvalue1|fieldname2|fieldvalue2|...</param>
        public void Post(string url, string fields, Action<EDownloadCode, UnityWebRequest> callback, int timeout = 0)
        {
            var uniWebRequest = CreateWebRequest(url, UnityWebRequest.kHttpVerbPOST, timeout);
            uniWebRequest.uploadHandler = new UploadHandlerRaw(Encoding.UTF8.GetBytes(fields));
            uniWebRequest.uploadHandler.contentType = "application/json";
            uniWebRequest.timeout = timeout;
            var webRequest = uniWebRequest.SendWebRequest();
            webRequest.completed += (operation) =>
            {
                PostRequestComplete(uniWebRequest, callback);
            };
        }

        /// <summary>
        /// post data to remote
        /// </summary>
        /// <param name="fields">fieldname1|fieldvalue1|fieldname2|fieldvalue2|...</param>
        public void PostForm(string url, string fields, Action<EDownloadCode, UnityWebRequest> callback, int timeout = 0)
        {
            var wwwForm = new WWWForm();
            if (!string.IsNullOrEmpty(fields))
            {
                var fieldArray = fields.Split('|');
                var fieldLen = fieldArray.Length;
                BFLog.LogAssert(fieldLen % 2 == 0, "fields format error!");

                for (int i = 0; i < fieldLen - 1; i += 2)
                    wwwForm.AddField(fieldArray[i], fieldArray[i + 1]);
            }

            var uniWebRequest = UnityWebRequest.Post(url, wwwForm);
            var webRequest = uniWebRequest.SendWebRequest();
            uniWebRequest.timeout = timeout;
            webRequest.completed += (operation) =>
            {
                PostRequestComplete(uniWebRequest, callback);
            };
        }

        void GetRequestComplete(UnityWebRequest uniWebRequest, Action<EDownloadCode, UnityWebRequest> callback)
        {
            if(uniWebRequest.result == UnityWebRequest.Result.ProtocolError || uniWebRequest.result == UnityWebRequest.Result.ConnectionError)
            {
                Debug.LogWarning(uniWebRequest.error);
                callback(EDownloadCode.ERROR, uniWebRequest);
            }
            else if (uniWebRequest.isDone && uniWebRequest.responseCode >= 200 && uniWebRequest.responseCode < 300)
            {
                callback(EDownloadCode.SUCCESS, uniWebRequest);
            }
            else
            {
                Debug.LogWarning(uniWebRequest.responseCode);
                callback(EDownloadCode.ERROR, uniWebRequest);
            }
            uniWebRequest.Dispose();
        }

        void PostRequestComplete(UnityWebRequest uniWebRequest, Action<EDownloadCode, UnityWebRequest> callback)
        {
            if(uniWebRequest.result == UnityWebRequest.Result.ProtocolError || uniWebRequest.result == UnityWebRequest.Result.ConnectionError)
            {
                Debug.LogWarning(uniWebRequest.error);
                callback(EDownloadCode.ERROR, uniWebRequest);
            }
            else if (uniWebRequest.isDone && uniWebRequest.responseCode >= 200 && uniWebRequest.responseCode < 300)
            {
                callback(EDownloadCode.SUCCESS, uniWebRequest);
            }
            else
            {
                Debug.LogWarning(uniWebRequest.responseCode);
                callback(EDownloadCode.ERROR, uniWebRequest);
            }
            uniWebRequest.Dispose();
        }
    }
}