using Model.Entity.Inspection;
using Service.Interface;
using Common.Notify;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;

namespace Service.Implement
{
    /// <summary>
    /// 企业微信群机器人通知发送器（群机器人 Webhook 无加签机制）
    /// 报文：msgtype=text（text 类型才支持 mentioned_mobile_list @手机号）
    /// </summary>
    public class WeComNotifier : IAlertNotifier
    {
        private readonly HttpClient _httpClient;
        private readonly ILogger<WeComNotifier> _logger;

        public WeComNotifier(HttpClient httpClient, ILogger<WeComNotifier> logger)
        {
            _httpClient = httpClient;
            _logger = logger;
        }

        public NotifyChannelTypeEnum ChannelType => NotifyChannelTypeEnum.WeCom;

        public async Task<NotifyResult> SendAsync(AlertNotifyMessage message, string webhookUrl, string? secret, CancellationToken ct = default)
        {
            try
            {
                var text = new StringBuilder();
                text.AppendLine(message.Title);
                text.AppendLine(message.Content);

                var body = new Dictionary<string, object>
                {
                    ["msgtype"] = "text",
                    ["text"] = new Dictionary<string, object>
                    {
                        ["content"] = text.ToString(),
                        ["mentioned_mobile_list"] = message.AtMobiles
                    }
                };

                string json = JsonSerializer.Serialize(body);
                _logger.LogInformation("企微推送 mentioned_mobile_list=[{At}]", string.Join(",", message.AtMobiles));
                using var content = new StringContent(json, Encoding.UTF8, "application/json");
                using var response = await _httpClient.PostAsync(webhookUrl, content, ct);
                string respText = await response.Content.ReadAsStringAsync(ct);

                if (!response.IsSuccessStatusCode)
                {
                    return NotifyResult.Fail($"HTTP {(int)response.StatusCode}: {Truncate(respText)}");
                }

                // 企微返回 {"errcode":0,"errmsg":"ok"}
                using var doc = JsonDocument.Parse(respText);
                bool ok = doc.RootElement.TryGetProperty("errcode", out var errcode) && errcode.GetInt32() == 0;
                return ok ? NotifyResult.Ok() : NotifyResult.Fail(Truncate(respText));
            }
            catch (Exception ex)
            {
                return NotifyResult.Fail($"企微推送异常: {NotifyError.Describe(ex)}");
            }
        }

        private static string Truncate(string s, int max = 200) =>
            string.IsNullOrEmpty(s) || s.Length <= max ? s : s.Substring(0, max) + "...";
    }
}