using Content.Server.DeviceNetwork.Systems;
using Content.Shared.DeviceNetwork.Events;
using Robust.Shared.Timing;
using Content.Shared.DeviceNetwork.Components;
using Content.Shared.Medical.CrewMonitoring;
using Content.Shared.Medical.SuitSensors;

namespace Content.Server.Medical.CrewMonitoring;

public sealed partial class CrewMonitoringServerSystem : EntitySystem
{
    [Dependency] private IGameTiming _gameTiming = default!;
    [Dependency] private DeviceNetworkSystem _deviceNetworkSystem = default!;
    [Dependency] private SingletonDeviceNetServerSystem _singletonServerSystem = default!;

    private const float UpdateRate = 3f;
    private float _updateDiff;

    public override void Initialize()
    {
        base.Initialize();
        SubscribeLocalEvent<CrewMonitoringServerComponent, ComponentRemove>(OnRemove);
        SubscribeLocalEvent<CrewMonitoringServerComponent, DeviceNetServerDisconnectedEvent>(OnDisconnected);
    }

    public override void Update(float frameTime)
    {
        base.Update(frameTime);

        // check update rate
        _updateDiff += frameTime;
        if (_updateDiff < UpdateRate)
            return;
        _updateDiff -= UpdateRate;

        var servers = EntityQueryEnumerator<CrewMonitoringServerComponent>();

        while (servers.MoveNext(out var id, out var server))
        {
            if (!_singletonServerSystem.IsActiveServer(id))
                continue;

            UpdateTimeout(id);
            BroadcastSensorStatus(id, server);
        }
    }

    /// <summary>
    /// Adds or updates a sensor status entry if the received package is a sensor status update
    /// </summary>
    [SubscribeLocalEvent]
    private void OnSensorStatus(Entity<CrewMonitoringServerComponent> ent, ref DeviceNetworkPacketEvent<SuitSensorStatusPayload> args)
    {
        var sensorData = args.Data.Data;
        sensorData.Timestamp = _gameTiming.CurTime;
        ent.Comp.SensorStatus[args.SenderAddress] = sensorData;
    }

    /// <summary>
    /// Clears the servers sensor status list
    /// </summary>
    private void OnRemove(EntityUid uid, CrewMonitoringServerComponent component, ComponentRemove args)
    {
        component.SensorStatus.Clear();
    }

    /// <summary>
    /// Drop the sensor status if it hasn't been updated for to long
    /// </summary>
    private void UpdateTimeout(EntityUid uid, CrewMonitoringServerComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return;

        foreach (var (address, sensor) in component.SensorStatus)
        {
            var dif = _gameTiming.CurTime - sensor.Timestamp;
            if (dif.Seconds > component.SensorTimeout)
                component.SensorStatus.Remove(address);
        }
    }

    /// <summary>
    /// Broadcasts the status of all connected sensors
    /// </summary>
    private void BroadcastSensorStatus(EntityUid uid, CrewMonitoringServerComponent? serverComponent = null, DeviceNetworkComponent? device = null)
    {
        if (!Resolve(uid, ref serverComponent, ref device))
            return;

        var payload = new BroadcastSuitSensorStatePayload
        {
            SensorStatus = serverComponent.SensorStatus,
        };

        _deviceNetworkSystem.SendPacket((uid, device), null, ref payload);
    }

    /// <summary>
    /// Clears sensor data on disconnect
    /// </summary>
    private void OnDisconnected(EntityUid uid, CrewMonitoringServerComponent component, ref DeviceNetServerDisconnectedEvent _)
    {
        component.SensorStatus.Clear();
    }
}