using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using YunDa.Server.ISMSTcp.Configuration;
using YunDa.SOMS.DataTransferObject;

namespace YunDa.Server.ISMSTcp.Services
{
    /// <summary>
    /// 孪生体ID API服务实现
    /// </summary>
    public class TwinIdApiService : ITwinIdApiService
    {
        private readonly HttpClient _httpClient;
        private readonly ILogger<TwinIdApiService> _logger;
        private readonly ApiEndpointsConfiguration _apiConfig;

        public TwinIdApiService(
            HttpClient httpClient,
            ILogger<TwinIdApiService> logger,
            IOptions<ApiEndpointsConfiguration> apiConfig)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
            _apiConfig = apiConfig?.Value ?? throw new ArgumentNullException(nameof(apiConfig));
        }

        /// <summary>
        /// 通过孪生体代码获取设备信息ID
        /// </summary>
        /// <param name="code">孪生体代码</param>
        /// <param name="cancellationToken">取消令牌</param>
        /// <returns>设备信息ID</returns>
        public async Task<RequestResult<Guid>> GetTwIdAsync(string code, CancellationToken cancellationToken = default)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(code))
                {
                    _logger.LogWarning("GetTwIdAsync called with empty or null code");
                    return RequestResult<Guid>.CreateFailed("孪生体代码不能为空");
                }

                // 构建完整的API URL
                var baseUrl = _apiConfig.BaseUrl.TrimEnd('/');
                var getTwIdPath = _apiConfig.GetTwId ?? "/api/services/SOMS/RackEquipment/GetTwId";
                var fullUrl = $"{baseUrl}{getTwIdPath}?code={Uri.EscapeDataString(code)}";

                _logger.LogDebug("Making API call to GetTwId: {Url}", fullUrl);

                // 发送HTTP GET请求
                var response = await _httpClient.GetAsync(fullUrl, cancellationToken).ConfigureAwait(false);

                if (response.IsSuccessStatusCode)
                {
                    var responseContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                    _logger.LogDebug("GetTwId API response: {Response}", responseContent);

                    // 反序列化响应
                    var result = JsonConvert.DeserializeObject<RequestResult<Guid>>(responseContent);
                    
                    if (result != null)
                    {
                        _logger.LogInformation("Successfully retrieved TwId for code: {Code}, EquipmentInfoId: {EquipmentInfoId}", 
                            code, result.ResultData);
                        return result;
                    }
                    else
                    {
                        _logger.LogWarning("GetTwId API returned null result for code: {Code}", code);
                        return RequestResult<Guid>.CreateFailed("API返回空结果");
                    }
                }
                else
                {
                    var errorContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                    _logger.LogError("GetTwId API call failed with status {StatusCode}: {ErrorContent}", 
                        response.StatusCode, errorContent);
                    return RequestResult<Guid>.CreateFailed($"API调用失败: {response.StatusCode}");
                }
            }
            catch (HttpRequestException ex)
            {
                _logger.LogError(ex, "HTTP request exception when calling GetTwId API for code: {Code}", code);
                return RequestResult<Guid>.CreateFailed($"网络请求异常: {ex.Message}");
            }
            catch (TaskCanceledException ex) when (ex.InnerException is TimeoutException)
            {
                _logger.LogError(ex, "Timeout when calling GetTwId API for code: {Code}", code);
                return RequestResult<Guid>.CreateFailed("API调用超时");
            }
            catch (TaskCanceledException ex) when (cancellationToken.IsCancellationRequested)
            {
                _logger.LogWarning("GetTwId API call was cancelled for code: {Code}", code);
                return RequestResult<Guid>.CreateFailed("请求已取消");
            }
            catch (JsonException ex)
            {
                _logger.LogError(ex, "JSON deserialization error when calling GetTwId API for code: {Code}", code);
                return RequestResult<Guid>.CreateFailed($"响应解析失败: {ex.Message}");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Unexpected error when calling GetTwId API for code: {Code}", code);
                return RequestResult<Guid>.CreateFailed($"未知错误: {ex.Message}");
            }
        }
    }
}