using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Reflection.Metadata;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using WIDESEAWCS_Common;
using WIDESEAWCS_Common.HttpEnum;
using WIDESEAWCS_Core.Caches;

namespace WIDESEA_Core
{
    public class HttpClientHelper
    {
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly ICacheService _cache;

        public HttpClientHelper(IHttpClientFactory httpClientFactory, ICacheService cache, IConfiguration configuration = null)
        {
            _httpClientFactory = httpClientFactory ?? throw new ArgumentNullException(nameof(httpClientFactory));
            _cache = cache ?? throw new ArgumentNullException(nameof(cache));
        }

        /// <summary>
        /// POST请求
        /// </summary>
        /// <param name="url">请求URL</param>
        /// <param name="content">请求内容</param>
        /// <param name="mediaType">媒体类型</param>
        /// <param name="config">请求配置</param>
        /// <returns></returns>
        public HttpResponseResult Post(string url, string content, string contentType = "application/json", HttpRequestConfig? config = null)
        {
            HttpResponseResult httpResponseResult = Task.Run(async () =>
            {
                return await ExecuteAsync(async (client) =>
                {
                    var request = new HttpRequestMessage(HttpMethod.Post, url);
                    request.Content = new StringContent(content ?? string.Empty, Encoding.UTF8, contentType);
                    SetRequestHeaders(request, config?.Headers);
                    return await client.SendAsync(request);
                }, config, $"POST {url}");
            }).GetAwaiter().GetResult();
            httpResponseResult.ApiUrl = url;
            return httpResponseResult;
        }

        public HttpResponseResult Get(string url, HttpRequestConfig? config = null)
        {
            HttpResponseResult httpResponseResult = Task.Run(async () =>
            {
                return await ExecuteAsync(async (client) =>
                {
                    var request = new HttpRequestMessage(HttpMethod.Get, url);
                    SetRequestHeaders(request, config?.Headers);
                    return await client.SendAsync(request);
                }, config, $"GET {url}");
            }).GetAwaiter().GetResult();

            httpResponseResult.ApiUrl = url;
            return httpResponseResult;
        }


        /// <summary>
        /// POST请求
        /// </summary>
        /// <param name="url">请求URL</param>
        /// <param name="content">请求内容</param>
        /// <param name="mediaType">媒体类型</param>
        /// <param name="config">请求配置</param>
        /// <returns></returns>
        public HttpResponseResult<TResponse> Post<TResponse>(string url, string content, string contentType = "application/json", HttpRequestConfig? config = null)
        {

            url = BaseAPI.WMSBaseUrl + _cache.Get($"{RedisPrefix.Code}:{RedisName.API}:{url}");
            HttpResponseResult httpResponseResult = Post(url, content, contentType, config);

            HttpResponseResult<TResponse> result = new HttpResponseResult<TResponse>
            {
                IsSuccess = httpResponseResult.IsSuccess,
                StatusCode = httpResponseResult.StatusCode,
                Content = httpResponseResult.Content,
                Headers = httpResponseResult.Headers,
                Duration = httpResponseResult.Duration,
                ErrorMessage = httpResponseResult.ErrorMessage,
                Exception = httpResponseResult.Exception
            };

            if (result.IsSuccess && !string.IsNullOrEmpty(result.Content))
            {
                try
                {
                    TResponse? response = JsonConvert.DeserializeObject<TResponse>(result.Content);
                    if (response != null)
                    {
                        result.Data = response;
                    }
                    else
                    {
                        result.IsSuccess = false;
                        result.ErrorMessage = "反序列化结果为null";
                    }
                }
                catch (Exception ex)
                {
                    result.IsSuccess = false;
                    result.ErrorMessage = $"反序列化失败: {ex.Message}";
                    result.Exception = ex;
                }
            }

            return result;
        }

        public HttpResponseResult<TResponse> Get<TResponse>(string url, HttpRequestConfig? config = null)
        {
            url = BaseAPI.WMSBaseUrl + _cache.Get($"{RedisPrefix.Code}:{RedisName.API}:{url}");
            HttpResponseResult httpResponseResult = Get(url, config);

            HttpResponseResult<TResponse> result = new HttpResponseResult<TResponse>
            {
                IsSuccess = httpResponseResult.IsSuccess,
                StatusCode = httpResponseResult.StatusCode,
                Content = httpResponseResult.Content,
                Headers = httpResponseResult.Headers,
                Duration = httpResponseResult.Duration,
                ErrorMessage = httpResponseResult.ErrorMessage,
                Exception = httpResponseResult.Exception
            };

            if (result.IsSuccess && !string.IsNullOrEmpty(result.Content))
            {
                try
                {
                    TResponse? response = JsonConvert.DeserializeObject<TResponse>(result.Content);
                    if (response != null)
                    {
                        result.Data = response;
                    }
                    else
                    {
                        result.IsSuccess = false;
                        result.ErrorMessage = "反序列化结果为null";
                    }
                }
                catch (Exception ex)
                {
                    result.IsSuccess = false;
                    result.ErrorMessage = $"反序列化失败: {ex.Message}";
                    result.Exception = ex;
                }
            }

            return result;
        }

        /// <summary>
        /// 执行HTTP请求
        /// </summary>
        private async Task<HttpResponseResult> ExecuteAsync(Func<HttpClient, Task<HttpResponseMessage>> requestFunc, HttpRequestConfig? config, string requestInfo)
        {
            var result = new HttpResponseResult();
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();
            config ??= new HttpRequestConfig();

            try
            {
                using var client = CreateHttpClient(config);
                HttpResponseMessage? response = null;
                Exception? lastException = null;

                // 重试机制
                for (int retry = 0; retry <= config.MaxRetryCount; retry++)
                {
                    try
                    {
                        response = await requestFunc(client);
                        if (response.StatusCode == System.Net.HttpStatusCode.OK)
                            break;
                    }
                    catch (Exception ex) when (retry < config.MaxRetryCount)
                    {
                        lastException = ex;
                        if (config.EnableLogging)
                        {
                            // TODO：日志记录
                        }
                        await Task.Delay(config.RetryIntervalMs, default);
                    }
                }

                if (response == null)
                {
                    throw lastException ?? new HttpRequestException("请求失败");
                }

                result.StatusCode = response.StatusCode;
                result.IsSuccess = response.IsSuccessStatusCode;

                // 读取响应内容
                result.Content = await response.Content.ReadAsStringAsync();

                // 获取响应头
                result.Headers = new Dictionary<string, IEnumerable<string>>();
                foreach (var header in response.Headers)
                {
                    result.Headers[header.Key] = header.Value;
                }
                foreach (var header in response.Content.Headers)
                {
                    result.Headers[header.Key] = header.Value;
                }

                if (config.EnableLogging)
                {
                    // TODO：日志记录
                }
            }
            catch (Exception ex)
            {
                result.IsSuccess = false;
                result.ErrorMessage = ex.Message;
                result.Exception = ex;

                if (config.EnableLogging)
                {
                    // TODO：日志记录
                }
            }
            finally
            {
                stopwatch.Stop();
                result.Duration = stopwatch.ElapsedMilliseconds;
            }

            return result;
        }

        /// <summary>
        /// 创建HttpClient
        /// </summary>
        private HttpClient CreateHttpClient(HttpRequestConfig config)
        {
            var client = _httpClientFactory.CreateClient();
            client.Timeout = TimeSpan.FromMilliseconds(config.TimeoutMs);

            // 设置默认请求头
            client.DefaultRequestHeaders.Clear();
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            return client;
        }


        /// <summary>
        /// 设置请求头
        /// </summary>
        private void SetRequestHeaders(HttpRequestMessage request, Dictionary<string, string>? headers)
        {
            if (headers != null)
            {
                foreach (var header in headers)
                {
                    if (!request.Headers.Contains(header.Key))
                    {
                        request.Headers.Add(header.Key, header.Value);
                    }
                }
            }
        }

    }
}