using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.Networking;
using System.Text;
using Newtonsoft.Json;
using UnityEngine.Events;
using System;

/// <summary>
/// 异步封装unityWebRequest请求
/// </summary>
public static class NetManager
{
    /// <summary>
    /// 发送GET请求并返回结果
    /// </summary>
    /// <typeparam name="T">返回结果的类型</typeparam>
    /// <param name="url">请求的URL</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    /// <returns>请求结果</returns>
    public static async UniTask<T> Get<T>(string url, UnityAction<T> onComplete)
    {
        return await SendRequest<T>(url, RequestType.GET, null, onComplete);
    }

    /// <summary>
    /// 发送GET请求
    /// </summary>
    /// <param name="url">请求的URL</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    public static async UniTask Get(string url, UnityAction onComplete)
    {
        await SendRequest(url, RequestType.GET, null, onComplete);
    }

    /// <summary>
    /// 发送POST请求并返回结果
    /// </summary>
    /// <typeparam name="T">返回结果的类型</typeparam>
    /// <param name="url">请求的URL</param>
    /// <param name="payload">请求的负载数据</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    /// <returns>请求结果</returns>
    public static async UniTask<T> Post<T>(string url, object payload, UnityAction<T> onComplete)
    {
        return await SendRequest<T>(url, RequestType.POST, payload, onComplete);
    }

    /// <summary>
    /// 发送POST请求
    /// </summary>
    /// <param name="url">请求的URL</param>
    /// <param name="payload">请求的负载数据</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    public static async UniTask Post(string url, object payload, UnityAction onComplete)
    {
        await SendRequest(url, RequestType.POST, payload, onComplete);
    }

    /// <summary>
    /// 发送请求并返回结果
    /// </summary>
    /// <typeparam name="T">返回结果的类型</typeparam>
    /// <param name="url">请求的URL</param>
    /// <param name="type">请求类型</param>
    /// <param name="payload">请求的负载数据</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    /// <returns>请求结果</returns>
    private static async UniTask<T> SendRequest<T>(string url, RequestType type, object payload, UnityAction<T> onComplete)
    {
        var request = CreateRequest(url, type, payload);
        try
        {
            await request.SendWebRequest();
            if (request.result != UnityWebRequest.Result.Success)
            {
                Debug.LogError($"Request failed: {request.error}");
                throw new System.Exception($"Request failed: {request.error}");
            }
            T result = JsonConvert.DeserializeObject<T>(request.downloadHandler.text);
            onComplete?.Invoke(result);
            return result;
        }
        catch (Exception ex)
        {
            Debug.LogError($"Exception during request: {ex.Message}");
            throw;
        }
        finally
        {
            request.Dispose();
        }
    }

    /// <summary>
    /// 发送请求
    /// </summary>
    /// <param name="url">请求的URL</param>
    /// <param name="type">请求类型</param>
    /// <param name="payload">请求的负载数据</param>
    /// <param name="onComplete">请求完成后的回调函数</param>
    private static async UniTask SendRequest(string url, RequestType type, object payload, UnityAction onComplete)
    {
        var request = CreateRequest(url, type, payload);
        try
        {
            await request.SendWebRequest();
            if (request.result != UnityWebRequest.Result.Success)
            {
                Debug.LogError($"Request failed: {request.error}");
                throw new System.Exception($"Request failed: {request.error}");
            }
            onComplete?.Invoke();
        }
        catch (Exception ex)
        {
            Debug.LogError($"Exception during request: {ex.Message}");
            throw;
        }
        finally
        {
            request.Dispose();
        }
    }

    /// <summary>
    /// 创建UnityWebRequest请求
    /// </summary>
    /// <param name="url">请求的URL</param>
    /// <param name="type">请求类型</param>
    /// <param name="data">请求的负载数据</param>
    /// <returns>UnityWebRequest实例</returns>
    private static UnityWebRequest CreateRequest(string url, RequestType type = RequestType.GET, object data = null)
    {
        var request = new UnityWebRequest(url, type.ToString());
        if (data != null)
        {
            string reqJson = JsonConvert.SerializeObject(data);
            var bodyRaw = Encoding.UTF8.GetBytes(reqJson);
            request.uploadHandler = new UploadHandlerRaw(bodyRaw);
        }
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");
        //request.SetRequestHeader("auth_token", GlobalFlag.token);
        return request;
    }

    /// <summary>
    /// 请求类型
    /// </summary>
    public enum RequestType
    {
        GET = 0,
        POST = 1
    }
}