using System;
using System.Collections.Generic;
using CncModels.Dto.Dashboard;
using CncRepository.Interface;
using CncService.Interface;

namespace CncService.Impl
{
    /// <summary>
    /// 仪表盘实现
    /// </summary>
    public class DashboardService : IDashboardService
    {
        private readonly IDashboardRepository _dashboardRepository;
        private readonly ICollectorHeartbeatRepository _collectorHeartbeatRepository;
        private readonly IWindowsServiceChecker _serviceChecker;

        public DashboardService(IDashboardRepository dashboardRepository,
            ICollectorHeartbeatRepository collectorHeartbeatRepository,
            IWindowsServiceChecker serviceChecker = null)
        {
            _dashboardRepository = dashboardRepository ?? throw new ArgumentNullException(nameof(dashboardRepository));
            _collectorHeartbeatRepository = collectorHeartbeatRepository ?? throw new ArgumentNullException(nameof(collectorHeartbeatRepository));
            _serviceChecker = serviceChecker;
        }

        /// <inheritdoc/>
        public DashboardSummaryResponse GetSummary()
        {
            return _dashboardRepository.GetSummary();
        }

        /// <inheritdoc/>
        public List<WorkshopProductionResponse> GetWorkshopProduction(DateTime? startDate, DateTime? endDate)
        {
            var s = startDate ?? DateTime.Today;
            var e = endDate ?? DateTime.Today;
            return _dashboardRepository.GetWorkshopProduction(s, e);
        }

        /// <inheritdoc/>
        public List<MachineRankResponse> GetMachineRank(DateTime? startDate, DateTime? endDate, int top = 10)
        {
            var s = startDate ?? DateTime.Today;
            var e = endDate ?? DateTime.Today;
            return _dashboardRepository.GetMachineRank(s, e, top);
        }

        /// <inheritdoc/>
        public List<WorkerRankResponse> GetWorkerRank(DateTime? startDate, DateTime? endDate, int top = 10)
        {
            var s = startDate ?? DateTime.Today;
            var e = endDate ?? DateTime.Today;
            return _dashboardRepository.GetWorkerRank(s, e, top);
        }

        /// <inheritdoc/>
        public object GetProductionTrend(int days = 7)
        {
            return _dashboardRepository.GetProductionTrend(days);
        }

        /// <inheritdoc/>
        public object GetMachineStatusDistribution()
        {
            return _dashboardRepository.GetMachineStatusDistribution();
        }

        /// <inheritdoc/>
        public List<AlertListItem> GetRecentAlerts(int count = 5)
        {
            return _dashboardRepository.GetRecentAlerts(count);
        }

        /// <inheritdoc/>
        public object GetCollectorStatus()
        {
            var latest = _collectorHeartbeatRepository.GetLatest("collector-service");
            // 心跳超时阈值：90秒（3个心跳间隔，采集服务默认每30秒上报一次）
            const int heartbeatTimeoutSeconds = 90;

            bool heartbeatRunning = false;
            long heartbeatUptime = 0;
            DateTime? lastCollectTime = latest?.LastCollectTime;

            if (latest != null && latest.Status == "running")
            {
                var lastHeartbeat = latest.CreatedAt;
                var elapsed = (DateTime.Now - lastHeartbeat).TotalSeconds;
                heartbeatRunning = elapsed <= heartbeatTimeoutSeconds;
                if (heartbeatRunning)
                    heartbeatUptime = latest.UptimeSeconds ?? 0;
            }

            // 额外的 Windows 服务状态
            string serviceStatusText = "NotInstalled";
            if (_serviceChecker != null)
            {
                var svc = _serviceChecker.GetServiceStatus("collector-service");
                serviceStatusText = svc.ToString();
            }

            // 组合状态：NotInstalled -> 停止，其他根据心跳决定
            string status = (serviceStatusText == "NotInstalled") ? "stopped" : (heartbeatRunning ? "running" : "stopped");

            return new {
                status,
                uptimeSeconds = heartbeatRunning ? heartbeatUptime : 0,
                lastCollectTime,
                serviceStatus = serviceStatusText,
                serviceName = "collector-service",
                serviceMessage = (string)null
            };
        }
    }
}