using System;
using System.Configuration;
using System.Net.Http;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using MonitorSnapshot = ivf_tl_Control.MonitorSnapshot;

namespace ivf_tl_Operate.Helpers
{
    /// <summary>
    /// 阶段2:operate 跨进程访问独立 control 的本地 HTTP 客户端。
    /// 拆分后 operate 进程内已无 control 的实时 AppData,监控页/调试页改经此客户端读 /status、
    /// 借串口 /serial/pause|resume、受护栏停止 /shutdown。全部 try 兜底,失败返回 null/false 不抛。
    /// </summary>
    public static class ControlClient
    {
        private static readonly HttpClient _http = new HttpClient { Timeout = TimeSpan.FromSeconds(3) };

        public static int Port =>
            int.TryParse(ConfigurationManager.AppSettings["controlPort"], out var p) ? p : 38080;

        private static string BaseUrl => $"http://127.0.0.1:{Port}";

        /// <summary>GET /status → 取回 control 的 MonitorSnapshot(失败返回 null,监控页据此显示"未托管")。</summary>
        public static MonitorSnapshot GetStatusSnapshot()
        {
            try
            {
                var resp = _http.GetAsync($"{BaseUrl}/status").GetAwaiter().GetResult();
                if (!resp.IsSuccessStatusCode) return null;
                string json = resp.Content.ReadAsStringAsync().GetAwaiter().GetResult();
                var jo = JObject.Parse(json);
                var snapTok = jo["snapshot"];
                if (snapTok == null || snapTok.Type == JTokenType.Null) return null;
                return snapTok.ToObject<MonitorSnapshot>();
            }
            catch { return null; }
        }

        /// <summary>control 是否存活(GET /ping)。</summary>
        public static bool IsAlive()
        {
            try
            {
                var resp = _http.GetAsync($"{BaseUrl}/ping").GetAwaiter().GetResult();
                return resp.IsSuccessStatusCode;
            }
            catch { return false; }
        }

        /// <summary>受护栏停止:POST /shutdown {token}。token=工程师口令,control 端校验。成功返回 true。</summary>
        public static bool Shutdown(string token)
        {
            try
            {
                var resp = _http.PostAsync($"{BaseUrl}/shutdown", JsonBody(new { token })).GetAwaiter().GetResult();
                return resp.IsSuccessStatusCode;
            }
            catch { return false; }
        }

        /// <summary>调试借串口:POST /serial/pause {houseSn} → control 让出该舱采集。成功返回 true。</summary>
        public static bool SerialPause(int houseSn) => PostSerial("pause", houseSn);

        /// <summary>调试归还:POST /serial/resume {houseSn} → control 恢复该舱采集。</summary>
        public static bool SerialResume(int houseSn) => PostSerial("resume", houseSn);

        private static bool PostSerial(string action, int houseSn)
        {
            try
            {
                var resp = _http.PostAsync($"{BaseUrl}/serial/{action}", JsonBody(new { houseSn })).GetAwaiter().GetResult();
                return resp.IsSuccessStatusCode;
            }
            catch { return false; }
        }

        private static StringContent JsonBody(object o) =>
            new StringContent(JsonConvert.SerializeObject(o), Encoding.UTF8, "application/json");
    }
}