using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading;
using Content.Server.Access.Systems;
using Content.Server.Cargo.Components;
using Content.Server.Cargo.Systems;
using Content.Server.Chat.Systems;
using Content.Server.Chemistry.Containers.EntitySystems;
using Content.Server.Damage.Components;
using Content.Server.Destructible;
using Content.Server.Destructible.Thresholds;
using Content.Server.Destructible.Thresholds.Behaviors;
using Content.Server.Destructible.Thresholds.Triggers;
using Content.Server.Item;
using Content.Server.Mail.Components;
using Content.Server.Mind;
using Content.Server.Popups;
using Content.Server.Power.Components;
using Content.Server.Spawners.EntitySystems;
using Content.Server.Station.Systems;
using Content.Shared.Access;
using Content.Shared.Access.Components;
using Content.Shared.Access.Systems;
using Content.Shared.Chat;
using Content.Shared.Damage;
using Content.Shared.Destructible;
using Content.Shared.Emag.Components;
using Content.Shared.Emag.Systems;
using Content.Shared.Examine;
using Content.Shared.Fluids.Components;
using Content.Shared.Hands.EntitySystems;
using Content.Shared.Interaction;
using Content.Shared.Interaction.Events;
using Content.Shared.Mail;
using Content.Shared.Maps;
using Content.Shared.Nutrition.Components;
using Content.Shared.Nutrition.EntitySystems;
using Content.Shared.PDA;
using Content.Shared.Roles;
using Content.Shared.Storage;
using Content.Shared.Tag;
using Robust.Shared.Audio;
using Robust.Shared.Audio.Systems;
using Robust.Shared.Containers;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;
using Timer = Robust.Shared.Timing.Timer;

namespace Content.Server.Mail.Systems;

public sealed class MailSystem : EntitySystem
{
    [Dependency] private readonly PopupSystem _popupSystem = default!;
    [Dependency] private readonly AccessReaderSystem _accessSystem = default!;
    [Dependency] private readonly SharedHandsSystem _handsSystem = default!;
    [Dependency] private readonly IdCardSystem _idCardSystem = default!;
    [Dependency] private readonly IRobustRandom _random = default!;
    [Dependency] private readonly TagSystem _tagSystem = default!;
    [Dependency] private readonly CargoSystem _cargoSystem = default!;
    [Dependency] private readonly StationSystem _stationSystem = default!;
    [Dependency] private readonly ChatSystem _chatSystem = default!;
    [Dependency] private readonly OpenableSystem _openable = default!;
    [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
    [Dependency] private readonly SharedContainerSystem _containerSystem = default!;
    [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
    [Dependency] private readonly SharedAppearanceSystem _appearanceSystem = default!;
    [Dependency] private readonly SharedAudioSystem _audioSystem = default!;
    [Dependency] private readonly DamageableSystem _damageableSystem = default!;
    [Dependency] private readonly MindSystem _mindSystem = default!;
    [Dependency] private readonly MetaDataSystem _metaDataSystem = default!;

    // DeltaV - system that keeps track of mail and cargo stats
    [Dependency] private readonly LogisticStatsSystem _logisticsStatsSystem = default!;

    private ISawmill _sawmill = default!;

    public override void Initialize()
    {
        base.Initialize();

        _sawmill = Logger.GetSawmill("mail");

        SubscribeLocalEvent<PlayerSpawningEvent>(OnSpawnPlayer, after: new[] { typeof(SpawnPointSystem) });

        SubscribeLocalEvent<MailComponent, ComponentRemove>(OnRemove);
        SubscribeLocalEvent<MailComponent, UseInHandEvent>(OnUseInHand);
        SubscribeLocalEvent<MailComponent, AfterInteractUsingEvent>(OnAfterInteractUsing);
        SubscribeLocalEvent<MailComponent, ExaminedEvent>(OnExamined);
        SubscribeLocalEvent<MailComponent, DestructionEventArgs>(OnDestruction);
        SubscribeLocalEvent<MailComponent, DamageChangedEvent>(OnDamage);
        SubscribeLocalEvent<MailComponent, BreakageEventArgs>(OnBreak);
        SubscribeLocalEvent<MailComponent, GotEmaggedEvent>(OnMailEmagged);
    }

    public override void Update(float frameTime)
    {
        base.Update(frameTime);
        foreach (var mailTeleporter in EntityQuery<MailTeleporterComponent>())
        {
            if (TryComp<ApcPowerReceiverComponent>(mailTeleporter.Owner, out var power) && !power.Powered)
                continue;

            mailTeleporter.Accumulator += frameTime;
            if (mailTeleporter.Accumulator < mailTeleporter.TeleportInterval.TotalSeconds)
                continue;

            mailTeleporter.Accumulator -= (float) mailTeleporter.TeleportInterval.TotalSeconds;

            SpawnMail(mailTeleporter.Owner, mailTeleporter);
        }
    }

    /// <summary>
    ///     Dynamically add the MailReceiver component to appropriate entities.
    /// </summary>
    private void OnSpawnPlayer(PlayerSpawningEvent args)
    {
        if (args.SpawnResult == null
            || args.Job == null
            || args.Station is not {} station
            || !HasComp<StationMailRouterComponent>(station))
            return;

        AddComp<MailReceiverComponent>(args.SpawnResult.Value);
    }

    private void OnRemove(EntityUid uid, MailComponent component, ComponentRemove args)
    {
        // Make sure the priority timer doesn't run.
        if (component.PriorityCancelToken != null)
            component.PriorityCancelToken.Cancel();
    }

    /// <summary>
    ///     Try to open the mail.
    /// </summary>
    private void OnUseInHand(EntityUid uid, MailComponent component, UseInHandEvent args)
    {
        if (!component.IsEnabled)
            return;
        if (component.IsLocked)
        {
            _popupSystem.PopupEntity(Loc.GetString("mail-locked"), uid, args.User);
            return;
        }
        OpenMail(uid, component, args.User);
    }

    /// <summary>
    ///     Handle logic similar between a normal mail unlock and an emag
    ///     frying out the lock.
    /// </summary>
    private void UnlockMail(EntityUid uid, MailComponent component)
    {
        component.IsLocked = false;
        UpdateAntiTamperVisuals(uid, false);

        if (component.IsPriority)
        {
            // This is a successful delivery. Keep the failure timer from triggering.
            if (component.PriorityCancelToken != null)
                component.PriorityCancelToken.Cancel();

            // The priority tape is visually considered to be a part of the
            // anti-tamper lock, so remove that too.
            _appearanceSystem.SetData(uid, MailVisuals.IsPriority, false);

            // The examination code depends on this being false to not show
            // the priority tape description anymore.
            component.IsPriority = false;
        }
    }

    /// <summary>
    ///     Check the ID against the mail's lock
    /// </summary>
    private void OnAfterInteractUsing(EntityUid uid, MailComponent component, AfterInteractUsingEvent args)
    {
        if (!args.CanReach || !component.IsLocked || !TryComp<AccessReaderComponent>(uid, out var access))
            return;

        IdCardComponent? idCard = null; // We need an ID card.
        if (HasComp<PdaComponent>(args.Used)) // Can we find it in a PDA if the user is using that?
        {
            _idCardSystem.TryGetIdCard(args.Used, out var pdaID);
            idCard = pdaID;
        }

        if (HasComp<IdCardComponent>(args.Used)) // Or are they using an id card directly?
            idCard = Comp<IdCardComponent>(args.Used);

        if (idCard == null) // Return if we still haven't found an id card.
            return;

        if (!HasComp<EmaggedComponent>(uid))
        {
            if (idCard.FullName != component.Recipient || idCard.JobTitle != component.RecipientJob)
            {
                _popupSystem.PopupEntity(Loc.GetString("mail-recipient-mismatch"), uid, args.User);
                return;
            }

            if (!_accessSystem.IsAllowed(uid, args.User))
            {
                _popupSystem.PopupEntity(Loc.GetString("mail-invalid-access"), uid, args.User);
                return;
            }
        }

        ExecuteForEachLogisticsStats(uid, (station, logisticStats) =>
        {
            _logisticsStatsSystem.AddOpenedMailEarnings(station,
                logisticStats,
                component.IsProfitable ? component.Bounty : 0);
        });
        UnlockMail(uid, component);

        if (!component.IsProfitable)
        {
            _popupSystem.PopupEntity(Loc.GetString("mail-unlocked"), uid, args.User);
            return;
        }

        _popupSystem.PopupEntity(Loc.GetString("mail-unlocked-reward", ("bounty", component.Bounty)), uid, args.User);

        component.IsProfitable = false;

        var query = EntityQueryEnumerator<StationBankAccountComponent>();
        while (query.MoveNext(out var station, out var account))
        {
            if (_stationSystem.GetOwningStation(uid) != station)
                continue;

            _cargoSystem.UpdateBankAccount(station, account, component.Bounty);
        }
    }

    private void OnExamined(EntityUid uid, MailComponent component, ExaminedEvent args)
    {
        MailEntityStrings mailEntityStrings = component.IsLarge ? MailConstants.MailLarge : MailConstants.Mail; //Frontier: mail types stored per type (large mail)
        if (!args.IsInDetailsRange)
        {
            args.PushMarkup(Loc.GetString(mailEntityStrings.DescFar)); // Frontier: mail constants struct
            return;
        }

        args.PushMarkup(Loc.GetString(mailEntityStrings.DescClose, ("name", component.Recipient), ("job", component.RecipientJob))); // Frontier: mail constants struct

        if (component.IsFragile)
            args.PushMarkup(Loc.GetString("mail-desc-fragile"));

        if (component.IsPriority)
        {
            if (component.IsProfitable)
                args.PushMarkup(Loc.GetString("mail-desc-priority"));
            else
                args.PushMarkup(Loc.GetString("mail-desc-priority-inactive"));
        }
    }

    /// <summary>
    ///     Penalize a station for a failed delivery.
    /// </summary>
    /// <remarks>
    ///     This will mark a parcel as no longer being profitable, which will
    ///     prevent multiple failures on different conditions for the same
    ///     delivery. <br/><br/>
    ///
    ///     The standard penalization is breaking the anti-tamper lock,
    ///     but this allows a delivery to fail for other reasons too
    ///     while having a generic function to handle different messages.
    /// </remarks>
    public void PenalizeStationFailedDelivery(EntityUid uid, MailComponent component, string localizationString)
    {
        if (!component.IsProfitable)
            return;

        _chatSystem.TrySendInGameICMessage(uid, Loc.GetString(localizationString, ("credits", component.Penalty)), InGameICChatType.Speak, false);
        _audioSystem.PlayPvs(component.PenaltySound, uid);

        component.IsProfitable = false;

        if (component.IsPriority)
            _appearanceSystem.SetData(uid, MailVisuals.IsPriorityInactive, true);

        var query = EntityQueryEnumerator<StationBankAccountComponent>();
        while (query.MoveNext(out var station, out var account))
        {
            if (_stationSystem.GetOwningStation(uid) != station)
                continue;

            _cargoSystem.UpdateBankAccount(station, account, component.Penalty);
            return;
        }
    }

    private void OnDestruction(EntityUid uid, MailComponent component, DestructionEventArgs args)
    {
        if (component.IsLocked)
        {
            // DeltaV - Tampered mail recorded to logistic stats
            ExecuteForEachLogisticsStats(uid, (station, logisticStats) =>
            {
                _logisticsStatsSystem.AddTamperedMailLosses(station,
                    logisticStats,
                    component.IsProfitable ? component.Penalty : 0);
            });

            PenalizeStationFailedDelivery(uid, component, "mail-penalty-lock");
        }

        if (component.IsEnabled)
            OpenMail(uid, component);

        UpdateAntiTamperVisuals(uid, false);
    }

    private void OnDamage(EntityUid uid, MailComponent component, DamageChangedEvent args)
    {
        if (args.DamageDelta == null || !_containerSystem.TryGetContainer(uid, "contents", out var contents))
            return;

        // Transfer damage to the contents.
        // This should be a general-purpose feature for all containers in the future.
        foreach (var entity in contents.ContainedEntities.ToArray())
            _damageableSystem.TryChangeDamage(entity, args.DamageDelta);
    }

    private void OnBreak(EntityUid uid, MailComponent component, BreakageEventArgs args)
    {
        _appearanceSystem.SetData(uid, MailVisuals.IsBroken, true);

        if (component.IsFragile)
        {
            // DeltaV - Broken mail recorded to logistic stats
            ExecuteForEachLogisticsStats(uid, (station, logisticStats) =>
            {
                _logisticsStatsSystem.AddDamagedMailLosses(station,
                    logisticStats,
                    component.IsProfitable ? component.Penalty : 0);
            });

            PenalizeStationFailedDelivery(uid, component, "mail-penalty-fragile");
        }
    }

    private void OnMailEmagged(EntityUid uid, MailComponent component, ref GotEmaggedEvent args)
    {
        if (!component.IsLocked)
            return;

        UnlockMail(uid, component);

        _popupSystem.PopupEntity(Loc.GetString("mail-unlocked-by-emag"), uid, args.UserUid);

        _audioSystem.PlayPvs(component.EmagSound, uid, AudioParams.Default.WithVolume(4));
        component.IsProfitable = false;
        args.Handled = true;
    }

    /// <summary>
    /// Returns true if the given entity is considered fragile for delivery.
    /// </summary>
    public bool IsEntityFragile(EntityUid uid, int fragileDamageThreshold)
    {
        // It takes damage on falling.
        if (HasComp<DamageOnLandComponent>(uid))
            return true;

        // It can be spilled easily and has something to spill.
        if (HasComp<SpillableComponent>(uid)
            && TryComp<OpenableComponent>(uid, out var openable)
            && !_openable.IsClosed(uid, null, openable)
            && _solutionContainerSystem.PercentFull(uid) > 0)
            return true;

        // It might be made of non-reinforced glass.
        if (TryComp(uid, out DamageableComponent? damageableComponent)
            && damageableComponent.DamageModifierSetId == "Glass")
            return true;

        if (!TryComp(uid, out DestructibleComponent? destructibleComp))
            return false;

        // Fallback: It breaks or is destroyed in less than a damage
        // threshold dictated by the teleporter.
        foreach (var threshold in destructibleComp.Thresholds)
        {
            if (threshold.Trigger is not DamageTrigger trigger || trigger.Damage >= fragileDamageThreshold)
                continue;

            foreach (var behavior in threshold.Behaviors)
            {
                if (behavior is not DoActsBehavior doActs)
                    continue;

                if (doActs.Acts.HasFlag(ThresholdActs.Breakage) || doActs.Acts.HasFlag(ThresholdActs.Destruction))
                    return true;
            }
        }

        return false;
    }

    public bool TryMatchJobTitleToDepartment(string jobTitle, [NotNullWhen(true)] out string? jobDepartment)
    {
        foreach (var department in _prototypeManager.EnumeratePrototypes<DepartmentPrototype>())
        {
            foreach (var role in department.Roles)
            {
                if (!_prototypeManager.TryIndex(role, out JobPrototype? jobPrototype) || jobPrototype.LocalizedName != jobTitle)
                    continue;

                jobDepartment = department.ID;
                return true;
            }
        }

        jobDepartment = null;
        return false;
    }

    public bool TryMatchJobTitleToPrototype(string jobTitle, [NotNullWhen(true)] out JobPrototype? jobPrototype)
    {
        foreach (var job in _prototypeManager.EnumeratePrototypes<JobPrototype>())
        {
            if (job.LocalizedName == jobTitle)
            {
                jobPrototype = job;
                return true;
            }
        }

        jobPrototype = null;
        return false;
    }

    /// <summary>
    /// Handle all the gritty details particular to a new mail entity.
    /// </summary>
    /// <remarks>
    /// This is separate mostly so the unit tests can get to it.
    /// </remarks>
    public void SetupMail(EntityUid uid, MailTeleporterComponent component, MailRecipient recipient)
    {
        var mailComp = EnsureComp<MailComponent>(uid);

        var container = _containerSystem.EnsureContainer<Container>(uid, "contents");
        foreach (var item in EntitySpawnCollection.GetSpawns(mailComp.Contents, _random))
        {
            var entity = EntityManager.SpawnEntity(item, Transform(uid).Coordinates);
            if (!_containerSystem.Insert(entity, container))
            {
                _sawmill.Error($"Can't insert {ToPrettyString(entity)} into new mail delivery {ToPrettyString(uid)}! Deleting it.");
                QueueDel(entity);
            }
            else if (!mailComp.IsFragile && IsEntityFragile(entity, component.FragileDamageThreshold))
            {
                mailComp.IsFragile = true;
            }
        }

        mailComp.IsPriority = recipient.MayReceivePriorityMail && _random.Prob(component.PriorityChance);
        mailComp.RecipientJob = recipient.Job;
        mailComp.Recipient = recipient.Name;

        var mailEntityStrings = mailComp.IsLarge ? MailConstants.MailLarge : MailConstants.Mail;
        if (mailComp.IsLarge)
        {
            mailComp.Bounty += component.LargeBonus;
            mailComp.Penalty += component.LargeMalus;
        }

        if (mailComp.IsFragile)
        {
            mailComp.Bounty += component.FragileBonus;
            mailComp.Penalty += component.FragileMalus;
            _appearanceSystem.SetData(uid, MailVisuals.IsFragile, true);
        }

        if (mailComp.IsPriority)
        {
            mailComp.Bounty += component.PriorityBonus;
            mailComp.Penalty += component.PriorityMalus;
            _appearanceSystem.SetData(uid, MailVisuals.IsPriority, true);
            mailComp.PriorityCancelToken = new CancellationTokenSource();

            Timer.Spawn((int) component.PriorityDuration.TotalMilliseconds, () =>
            {
                // DeltaV - Expired mail recorded to logistic stats
                ExecuteForEachLogisticsStats(uid, (station, logisticStats) =>
                {
                    _logisticsStatsSystem.AddExpiredMailLosses(station,
                        logisticStats,
                        mailComp.IsProfitable ? mailComp.Penalty : 0);
                });

                PenalizeStationFailedDelivery(uid, mailComp, "mail-penalty-expired");
            }, mailComp.PriorityCancelToken.Token);
        }

        _appearanceSystem.SetData(uid, MailVisuals.JobIcon, recipient.JobIcon);

        _metaDataSystem.SetEntityName(uid, Loc.GetString(mailEntityStrings.NameAddressed, // Frontier: move constant to MailEntityString
            ("recipient", recipient.Name)));

        var accessReader = EnsureComp<AccessReaderComponent>(uid);
        accessReader.AccessLists.Add(recipient.AccessTags);
    }

    /// <summary>
    /// Return the parcels waiting for delivery.
    /// </summary>
    /// <param name="uid">The mail teleporter to check.</param>
    public List<EntityUid> GetUndeliveredParcels(EntityUid uid)
    {
        // An alternative solution would be to keep a list of the unopened
        // parcels spawned by the teleporter and see if they're not carried
        // by someone, but this is simple, and simple is good.
        List<EntityUid> undeliveredParcels = new();
        foreach (var entityInTile in TurfHelpers.GetEntitiesInTile(Transform(uid).Coordinates, LookupFlags.Dynamic | LookupFlags.Sundries))
        {
            if (HasComp<MailComponent>(entityInTile))
                undeliveredParcels.Add(entityInTile);
        }
        return undeliveredParcels;
    }

    /// <summary>
    /// Return how many parcels are waiting for delivery.
    /// </summary>
    /// <param name="uid">The mail teleporter to check.</param>
    public uint GetUndeliveredParcelCount(EntityUid uid)
    {
        return (uint) GetUndeliveredParcels(uid).Count();
    }

    /// <summary>
    /// Try to match a mail receiver to a mail teleporter.
    /// </summary>
    public bool TryGetMailTeleporterForReceiver(MailReceiverComponent receiver, [NotNullWhen(true)] out MailTeleporterComponent? teleporterComponent)
    {
        foreach (var mailTeleporter in EntityQuery<MailTeleporterComponent>())
        {
            if (_stationSystem.GetOwningStation(receiver.Owner) != _stationSystem.GetOwningStation(mailTeleporter.Owner))
                continue;

            teleporterComponent = mailTeleporter;
            return true;
        }

        teleporterComponent = null;
        return false;
    }

    /// <summary>
    /// Try to construct a recipient struct for a mail parcel based on a receiver.
    /// </summary>
    public bool TryGetMailRecipientForReceiver(MailReceiverComponent receiver, [NotNullWhen(true)] out MailRecipient? recipient)
    {
        // Because of the way this works, people are not considered
        // candidates for mail if there is no valid PDA or ID in their slot
        // or active hand. A better future solution might be checking the
        // station records, possibly cross-referenced with the medical crew
        // scanner to look for living recipients. TODO

        if (_idCardSystem.TryFindIdCard(receiver.Owner, out var idCard)
            && TryComp<AccessComponent>(idCard.Owner, out var access)
            && idCard.Comp.FullName != null
            && idCard.Comp.JobTitle != null)
        {
            var accessTags = access.Tags;

            var mayReceivePriorityMail = !(_mindSystem.GetMind(receiver.Owner) == null);

            recipient = new MailRecipient(idCard.Comp.FullName,
                idCard.Comp.JobTitle,
                idCard.Comp.JobIcon,
                accessTags,
                mayReceivePriorityMail);

            return true;
        }

        recipient = null;
        return false;
    }

    /// <summary>
    /// Get the list of valid mail recipients for a mail teleporter.
    /// </summary>
    public List<MailRecipient> GetMailRecipientCandidates(EntityUid uid)
    {
        List<MailRecipient> candidateList = new();

        foreach (var receiver in EntityQuery<MailReceiverComponent>())
        {
            if (_stationSystem.GetOwningStation(receiver.Owner) != _stationSystem.GetOwningStation(uid))
                continue;

            if (TryGetMailRecipientForReceiver(receiver, out MailRecipient? recipient))
                candidateList.Add(recipient.Value);
        }

        return candidateList;
    }

    /// <summary>
    ///     Handle the spawning of all the mail for a mail teleporter.
    /// </summary>
    public void SpawnMail(EntityUid uid, MailTeleporterComponent? component = null)
    {
        if (!Resolve(uid, ref component))
        {
            _sawmill.Error($"Tried to SpawnMail on {ToPrettyString(uid)} without a valid MailTeleporterComponent!");
            return;
        }

        if (GetUndeliveredParcelCount(uid) >= component.MaximumUndeliveredParcels)
            return;

        var candidateList = GetMailRecipientCandidates(uid);

        if (candidateList.Count <= 0)
        {
            _sawmill.Error("List of mail candidates was empty!");
            return;
        }

        if (!_prototypeManager.TryIndex<MailDeliveryPoolPrototype>(component.MailPool, out var pool))
        {
            _sawmill.Error($"Can't index {ToPrettyString(uid)}'s MailPool {component.MailPool}!");
            return;
        }

        for (int i = 0;
             i < component.MinimumDeliveriesPerTeleport + candidateList.Count / component.CandidatesPerDelivery;
             i++)
        {
            var candidate = _random.Pick(candidateList);
            var possibleParcels = new Dictionary<string, float>(pool.Everyone);

            if (TryMatchJobTitleToPrototype(candidate.Job, out JobPrototype? jobPrototype)
                && pool.Jobs.TryGetValue(jobPrototype.ID, out Dictionary<string, float>? jobParcels))
            {
                possibleParcels = possibleParcels.Union(jobParcels)
                    .GroupBy(g => g.Key)
                    .ToDictionary(pair => pair.Key, pair => pair.First().Value);
            }

            if (TryMatchJobTitleToDepartment(candidate.Job, out string? department)
                && pool.Departments.TryGetValue(department, out Dictionary<string, float>? departmentParcels))
            {
                possibleParcels = possibleParcels.Union(departmentParcels)
                    .GroupBy(g => g.Key)
                    .ToDictionary(pair => pair.Key, pair => pair.First().Value);
            }

            var accumulated = 0f;
            var randomPoint = _random.NextFloat(possibleParcels.Values.Sum());
            string? chosenParcel = null;
            foreach (var (key, weight) in possibleParcels)
            {
                accumulated += weight;
                if (accumulated >= randomPoint)
                {
                    chosenParcel = key;
                    break;
                }
            }

            if (chosenParcel == null)
            {
                _sawmill.Error($"MailSystem wasn't able to find a deliverable parcel for {candidate.Name}, {candidate.Job}!");
                return;
            }

            var mail = EntityManager.SpawnEntity(chosenParcel, Transform(uid).Coordinates);
            SetupMail(mail, component, candidate);

            _tagSystem.AddTag(mail, "Mail"); // Frontier
        }

        if (_containerSystem.TryGetContainer(uid, "queued", out var queued))
            _containerSystem.EmptyContainer(queued);

        _audioSystem.PlayPvs(component.TeleportSound, uid);
    }

    public void OpenMail(EntityUid uid, MailComponent? component = null, EntityUid? user = null)
    {
        if (!Resolve(uid, ref component))
            return;

        _audioSystem.PlayPvs(component.OpenSound, uid);

        if (user != null)
            _handsSystem.TryDrop((EntityUid) user);

        if (!_containerSystem.TryGetContainer(uid, "contents", out var contents))
        {
            // I silenced this error because it fails non deterministically in tests and doesn't seem to effect anything else.
            // _sawmill.Error($"Mail {ToPrettyString(uid)} was missing contents container!");
            return;
        }

        foreach (var entity in contents.ContainedEntities.ToArray())
        {
            _handsSystem.PickupOrDrop(user, entity);
        }

        _tagSystem.AddTag(uid, "Trash");
        _tagSystem.AddTag(uid, "Recyclable");
        component.IsEnabled = false;
        UpdateMailTrashState(uid, true);
    }

    private void UpdateAntiTamperVisuals(EntityUid uid, bool isLocked)
    {
        _appearanceSystem.SetData(uid, MailVisuals.IsLocked, isLocked);
    }

    private void UpdateMailTrashState(EntityUid uid, bool isTrash)
    {
        _appearanceSystem.SetData(uid, MailVisuals.IsTrash, isTrash);
    }

    // DeltaV - Helper function that executes for each StationLogisticsStatsComponent
    // For updating MailMetrics stats
    private void ExecuteForEachLogisticsStats(EntityUid uid,
        Action<EntityUid, StationLogisticStatsComponent> action)
    {

        var query = EntityQueryEnumerator<StationLogisticStatsComponent>();
        while (query.MoveNext(out var station, out var logisticStats))
        {
            if (_stationSystem.GetOwningStation(uid) != station)
                continue;
            action(station, logisticStats);
        }
    }
}

public struct MailRecipient(
    string name,
    string job,
    string jobIcon,
    HashSet<ProtoId<AccessLevelPrototype>> accessTags,
    bool mayReceivePriorityMail)
{
    public string Name = name;
    public string Job = job;
    public string JobIcon = jobIcon;
    public HashSet<ProtoId<AccessLevelPrototype>> AccessTags = accessTags;
    public bool MayReceivePriorityMail = mayReceivePriorityMail;
}