using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using Dapper;
using MySqlConnector;
using CncModels.Entity;
using CncCollector.Config;
using log4net;

namespace CncCollector.Core
{
    /// <summary>
    /// 采集引擎主控。
    /// 负责加载采集地址、管理工作线程、心跳上报、配置轮询和日终汇总调度。
    /// </summary>
    public class CollectorEngine
    {
        private static readonly ILog _log = LogManager.GetLogger(typeof(CollectorEngine));

        private readonly CollectorConfig _config;
        private readonly ConcurrentDictionary<int, CollectWorker> _workers = new ConcurrentDictionary<int, CollectWorker>();
        private readonly ProductionTracker _tracker;
        private readonly DailySummaryJob _dailySummary;
        private Timer _heartbeatTimer;
        private Timer _configPollTimer;
        private Timer _dailySummaryTimer;
        private DateTime _startTime;
        private long _totalSuccess;
        private long _totalFail;
        private volatile bool _isRunning;
        private DateTime _lastSummaryDate = DateTime.MinValue;

        /// <summary>是否运行中</summary>
        public bool IsRunning => _isRunning;

        /// <summary>启动时间</summary>
        public DateTime StartTime => _startTime;

        /// <summary>运行时长（秒）</summary>
        public long UptimeSeconds => _isRunning ? (long)(DateTime.Now - _startTime).TotalSeconds : 0;

        /// <summary>工作线程数量</summary>
        public int WorkerCount => _workers.Count;

        /// <summary>
        /// 初始化采集引擎
        /// </summary>
        /// <param name="config">全局配置</param>
        public CollectorEngine(CollectorConfig config)
        {
            _config = config;
            _tracker = new ProductionTracker(config.BusinessConnection);
            _dailySummary = new DailySummaryJob(config.BusinessConnection);
        }

        /// <summary>
        /// 启动采集引擎：加载地址、启动工作线程、启动定时任务
        /// </summary>
        public void Start()
        {
            if (_isRunning) return;

            _log.Info("===== 采集引擎启动 =====");
            _startTime = DateTime.Now;
            _isRunning = true;

            // 1. 加载并启动采集地址
            LoadAndStartWorkers();

            // 2. 启动心跳上报定时器
            _heartbeatTimer = new Timer(OnHeartbeat, null,
                TimeSpan.FromSeconds(_config.HeartbeatIntervalSeconds),
                TimeSpan.FromSeconds(_config.HeartbeatIntervalSeconds));

            // 3. 启动配置轮询定时器
            _configPollTimer = new Timer(OnConfigPoll, null,
                TimeSpan.FromSeconds(_config.ConfigPollIntervalSeconds),
                TimeSpan.FromSeconds(_config.ConfigPollIntervalSeconds));

            // 4. 启动日终汇总检查定时器（每分钟检查一次）
            _dailySummaryTimer = new Timer(OnDailySummaryCheck, null,
                TimeSpan.FromMinutes(1), TimeSpan.FromMinutes(1));

            _log.Info($"===== 采集引擎已启动（{_workers.Count}个采集地址）=====");
        }

        /// <summary>
        /// 停止采集引擎
        /// </summary>
        public void Stop()
        {
            if (!_isRunning) return;

            _log.Info("===== 采集引擎停止中 =====");
            _isRunning = false;

            // 停止所有工作线程
            foreach (var kvp in _workers)
            {
                kvp.Value.Stop();
            }
            _workers.Clear();

            // 结账所有活跃段
            _tracker.Dispose();

            // 停止定时器
            _heartbeatTimer?.Dispose();
            _configPollTimer?.Dispose();
            _dailySummaryTimer?.Dispose();

            // 写入停止状态心跳
            WriteHeartbeat("stopped");

            _log.Info("===== 采集引擎已停止 =====");
        }

        /// <summary>
        /// 刷新配置：重新加载采集地址，处理新增/删除/变更
        /// </summary>
        public void Refresh()
        {
            _log.Info("刷新采集配置...");
            LoadAndStartWorkers();
            _log.Info("采集配置刷新完成");
        }

        /// <summary>
        /// 获取引擎状态摘要
        /// </summary>
        public Dictionary<string, object> GetStatus()
        {
            var status = new Dictionary<string, object>
            {
                ["isRunning"] = _isRunning,
                ["startTime"] = _startTime.ToString("yyyy-MM-dd HH:mm:ss"),
                ["uptimeSeconds"] = UptimeSeconds,
                ["workerCount"] = _workers.Count,
                ["totalSuccess"] = _totalSuccess,
                ["totalFail"] = _totalFail
            };

            var workerList = new List<Dictionary<string, object>>();
            foreach (var kvp in _workers)
            {
                workerList.Add(new Dictionary<string, object>
                {
                    ["addressId"] = kvp.Key,
                    ["name"] = kvp.Value.AddressName,
                    ["url"] = kvp.Value.AddressUrl,
                    ["isRunning"] = kvp.Value.IsRunning
                });
            }
            status["workers"] = workerList;

            return status;
        }

        /// <summary>
        /// 加载启用的采集地址并启动工作线程
        /// </summary>
        private void LoadAndStartWorkers()
        {
            try
            {
                List<CollectAddress> addresses;
                using (var conn = new MySqlConnection(_config.BusinessConnection))
                {
                    addresses = conn.Query<CollectAddress>(
                        "SELECT id as Id, name as Name, url as Url, brand_id as BrandId, collect_interval as CollectInterval, is_enabled as IsEnabled, last_collect_time as LastCollectTime, last_collect_status as LastCollectStatus, fail_count as FailCount, created_at as CreatedAt, updated_at as UpdatedAt FROM cnc_collect_address WHERE is_enabled = 1"
                    ).AsList();
                }

                // 停止已删除的地址
                foreach (var kvp in _workers)
                {
                    bool exists = false;
                    foreach (var addr in addresses)
                    {
                        if (addr.Id == kvp.Key) { exists = true; break; }
                    }
                    if (!exists)
                    {
                        kvp.Value.Stop();
                        CollectWorker removed;
                        _workers.TryRemove(kvp.Key, out removed);
                        _log.Info($"已停止删除的采集地址: {kvp.Value.AddressName}");
                    }
                }

                // 启动新增的地址
                foreach (var addr in addresses)
                {
                    if (!_workers.ContainsKey(addr.Id))
                    {
                        var worker = new CollectWorker(addr, _config, _tracker,
                            _config.BusinessConnection, _config.LogConnection);
                        worker.Start();
                        _workers[addr.Id] = worker;
                        _log.Info($"已启动采集地址: {addr.Name}（URL={addr.Url}, 间隔={addr.CollectInterval}秒）");
                    }
                }
            }
            catch (Exception ex)
            {
                _log.Error("加载采集地址失败", ex);
            }
        }

        /// <summary>
        /// 心跳上报回调
        /// </summary>
        private void OnHeartbeat(object state)
        {
            try
            {
                // 统计成功/失败次数
                long success = 0, fail = 0;
                foreach (var kvp in _workers)
                {
                    success += kvp.Value.SuccessCount;
                    fail += kvp.Value.FailCount;
                }
                _totalSuccess = success;
                _totalFail = fail;

                WriteHeartbeat("running");
            }
            catch (Exception ex)
            {
                _log.Error("心跳上报失败", ex);
            }
        }

        /// <summary>
        /// 写入心跳记录到 log_collector_heartbeat
        /// </summary>
        private void WriteHeartbeat(string status)
        {
            try
            {
                using (var conn = new MySqlConnection(_config.LogConnection))
                {
                    conn.Execute(@"INSERT INTO log_collector_heartbeat (service_id, status, last_collect_time, success_count, fail_count, uptime_seconds, detail, created_at)
                        VALUES (@ServiceId, @Status, @LastCollectTime, @SuccessCount, @FailCount, @UptimeSeconds, @Detail, NOW())",
                        new
                        {
                            ServiceId = _config.ServiceId,
                            Status = status,
                            LastCollectTime = DateTime.Now,
                            SuccessCount = _totalSuccess,
                            FailCount = _totalFail,
                            UptimeSeconds = UptimeSeconds,
                            Detail = (string)null
                        });
                }
            }
            catch (Exception ex)
            {
                _log.Error("写入心跳记录失败", ex);
            }
        }

        /// <summary>
        /// 配置轮询回调：检查是否有配置变更
        /// </summary>
        private void OnConfigPoll(object state)
        {
            try
            {
                // 重新从DB加载运行时配置
                ConfigLoader.LoadRuntimeConfig(_config.BusinessConnection, _config);

                // 重新加载采集地址
                LoadAndStartWorkers();
            }
            catch (Exception ex)
            {
                _log.Error("配置轮询失败", ex);
            }
        }

        /// <summary>
        /// 日终汇总检查回调：检查是否到了配置的汇总时间
        /// </summary>
        private void OnDailySummaryCheck(object state)
        {
            try
            {
                // 解析汇总时间
                TimeSpan summaryTime;
                if (!TimeSpan.TryParse(_config.DailySummaryTime, out summaryTime))
                {
                    summaryTime = new TimeSpan(1, 0, 0); // 默认01:00
                }

                var now = DateTime.Now;
                var targetTime = new DateTime(now.Year, now.Month, now.Day, summaryTime.Hours, summaryTime.Minutes, 0);

                // 检查是否到了汇总时间（±1分钟内）
                if (Math.Abs((now - targetTime).TotalMinutes) <= 1)
                {
                    // 汇总昨天的数据
                    DateTime summaryDate = now.Date.AddDays(-1);
                    if (_lastSummaryDate != summaryDate)
                    {
                        _lastSummaryDate = summaryDate;
                        _dailySummary.Execute(summaryDate);
                    }
                }
            }
            catch (Exception ex)
            {
                _log.Error("日终汇总检查失败", ex);
            }
        }
    }
}