using Content.Shared.Chat;
using Content.Shared.Inventory.Events;
using Content.Shared.Radio;
using Content.Shared.Radio.Components;
using Content.Shared.Radio.EntitySystems;
using Robust.Shared.Network;
using Robust.Shared.Player;

namespace Content.Server.Radio.EntitySystems;

public sealed class HeadsetSystem : SharedHeadsetSystem
{
    [Dependency] private readonly INetManager _netMan = default!;
    [Dependency] private readonly RadioSystem _radio = default!;

    public override void Initialize()
    {
        base.Initialize();
        SubscribeLocalEvent<HeadsetComponent, RadioReceiveEvent>(OnHeadsetReceive);
        SubscribeLocalEvent<HeadsetComponent, EncryptionChannelsChangedEvent>(OnKeysChanged);

        SubscribeLocalEvent<WearingHeadsetComponent, EntitySpokeEvent>(OnSpeak);
    }

    private void OnKeysChanged(EntityUid uid, HeadsetComponent component, EncryptionChannelsChangedEvent args)
    {
        UpdateRadioChannels(uid, component, args.Component);
    }

    private void UpdateRadioChannels(EntityUid uid, HeadsetComponent headset, EncryptionKeyHolderComponent? keyHolder = null)
    {
        // make sure to not add ActiveRadioComponent when headset is being deleted
        if (!headset.Enabled || MetaData(uid).EntityLifeStage >= EntityLifeStage.Terminating)
            return;

        if (!Resolve(uid, ref keyHolder))
            return;

        if (keyHolder.Channels.Count == 0)
            RemComp<ActiveRadioComponent>(uid);
        else
            EnsureComp<ActiveRadioComponent>(uid).Channels = new(keyHolder.Channels);
    }

    private void OnSpeak(EntityUid uid, WearingHeadsetComponent component, EntitySpokeEvent args)
    {
        if (args.Channel != null
            && TryComp(component.Headset, out EncryptionKeyHolderComponent? keys)
            && keys.Channels.Contains(args.Channel.ID))
        {
            _radio.SendRadioMessage(uid, args.Message, args.Channel, component.Headset);
            args.Channel = null; // prevent duplicate messages from other listeners.
        }
    }

    protected override void OnGotEquipped(EntityUid uid, HeadsetComponent component, GotEquippedEvent args)
    {
        base.OnGotEquipped(uid, component, args);
        if (component.IsEquipped && component.Enabled)
        {
            EnsureComp<WearingHeadsetComponent>(args.Equipee).Headset = uid;
            UpdateRadioChannels(uid, component);
        }
    }

    protected override void OnGotUnequipped(EntityUid uid, HeadsetComponent component, GotUnequippedEvent args)
    {
        base.OnGotUnequipped(uid, component, args);
        RemComp<ActiveRadioComponent>(uid);
        RemComp<WearingHeadsetComponent>(args.Equipee);
    }

    public void SetEnabled(EntityUid uid, bool value, HeadsetComponent? component = null)
    {
        if (!Resolve(uid, ref component))
            return;

        if (component.Enabled == value)
            return;

        component.Enabled = value;
        Dirty(uid, component);

        if (!value)
        {
            RemCompDeferred<ActiveRadioComponent>(uid);

            if (component.IsEquipped)
                RemCompDeferred<WearingHeadsetComponent>(Transform(uid).ParentUid);
        }
        else if (component.IsEquipped)
        {
            EnsureComp<WearingHeadsetComponent>(Transform(uid).ParentUid).Headset = uid;
            UpdateRadioChannels(uid, component);
        }
    }

    private void OnHeadsetReceive(EntityUid uid, HeadsetComponent component, ref RadioReceiveEvent args)
    {
        // TODO: change this when a code refactor is done
        // this is currently done this way because receiving radio messages on an entity otherwise requires that entity
        // to have an ActiveRadioComponent

        var parent = Transform(uid).ParentUid;

        if (parent.IsValid())
        {
            var relayEvent = new HeadsetRadioReceiveRelayEvent(args);
            RaiseLocalEvent(parent, ref relayEvent);
        }

        if (TryComp(parent, out ActorComponent? actor))
            _netMan.ServerSendMessage(args.ChatMsg, actor.PlayerSession.Channel);
    }
}