using Content.Server.Body.Components;
using Content.Server.Medical.Components;
using Content.Server.PowerCell;
using Content.Server.Temperature.Components;
using Content.Shared.Traits.Assorted;
using Content.Shared.Chemistry.EntitySystems;
using Content.Shared.Damage;
using Content.Shared.DoAfter;
using Content.Shared.IdentityManagement;
using Content.Shared.Interaction;
using Content.Shared.Interaction.Events;
using Content.Shared.Item.ItemToggle;
using Content.Shared.Item.ItemToggle.Components;
using Content.Shared.MedicalScanner;
using Content.Shared.Mobs.Components;
using Content.Shared.Popups;
using Robust.Server.GameObjects;
using Robust.Shared.Containers;
using Robust.Shared.Timing;
// Shitmed Change
using Content.Shared.Body.Part;
using Content.Shared.Body.Systems;
using Content.Shared._Shitmed.Targeting;
using System.Linq;

namespace Content.Server.Medical;

public sealed class MedBookSystem : EntitySystem
{
    [Dependency] private readonly IGameTiming _timing = default!;
    [Dependency] private readonly PowerCellSystem _cell = default!;
    [Dependency] private readonly SharedDoAfterSystem _doAfterSystem = default!;
    [Dependency] private readonly SharedBodySystem _bodySystem = default!; // Shitmed Change
    [Dependency] private readonly ItemToggleSystem _toggle = default!;
    [Dependency] private readonly SharedSolutionContainerSystem _solutionContainerSystem = default!;
    [Dependency] private readonly UserInterfaceSystem _uiSystem = default!;
    [Dependency] private readonly TransformSystem _transformSystem = default!;
    [Dependency] private readonly SharedPopupSystem _popupSystem = default!;

    public override void Initialize()
    {
        SubscribeLocalEvent<MedBookComponent, AfterInteractEvent>(OnAfterInteract);
        SubscribeLocalEvent<MedBookComponent, MedBookDoAfterEvent>(OnDoAfter);
        SubscribeLocalEvent<MedBookComponent, EntGotInsertedIntoContainerMessage>(OnInsertedIntoContainer);
        SubscribeLocalEvent<MedBookComponent, ItemToggledEvent>(OnToggled);
        SubscribeLocalEvent<MedBookComponent, DroppedEvent>(OnDropped);
        // Shitmed Change Start
        Subs.BuiEvents<MedBookComponent>(MedBookUiKey.Key, subs =>
        {
            subs.Event<MedBookPartMessage>(OnMedBookPartSelected);
        });
        // Shitmed Change End
    }

    public override void Update(float frameTime)
    {
        var analyzerQuery = EntityQueryEnumerator<MedBookComponent, TransformComponent>();
        while (analyzerQuery.MoveNext(out var uid, out var component, out var transform))
        {
            //Update rate limited to 1 second
            if (component.NextUpdate > _timing.CurTime)
                continue;

            if (component.ScannedEntity is not { } patient)
                continue;

            if (Deleted(patient))
            {
                StopAnalyzingEntity((uid, component), patient);
                continue;
            }
            // Shitmed Change Start
            if (component.CurrentBodyPart != null
                && (Deleted(component.CurrentBodyPart)
                || TryComp(component.CurrentBodyPart, out BodyPartComponent? bodyPartComponent)
                && bodyPartComponent.Body is null))
            {
                BeginAnalyzingEntity((uid, component), patient, null);
                continue;
            }
            // Shitmed Change End
            component.NextUpdate = _timing.CurTime + component.UpdateInterval;

            //Get distance between health analyzer and the scanned entity
            var patientCoordinates = Transform(patient).Coordinates;
            if (!_transformSystem.InRange(patientCoordinates, transform.Coordinates, component.MaxScanRange))
            {
                //Range too far, disable updates
                StopAnalyzingEntity((uid, component), patient);
                continue;
            }

            UpdateScannedUser(uid, patient, true, component.CurrentBodyPart); // Shitmed Change
        }
    }

    /// <summary>
    /// Trigger the doafter for scanning
    /// </summary>
    private void OnAfterInteract(Entity<MedBookComponent> uid, ref AfterInteractEvent args)
    {
        if (args.Target == null || !args.CanReach || !HasComp<MobStateComponent>(args.Target) || !_cell.HasDrawCharge(uid, user: args.User))
            return;

        var doAfterCancelled = !_doAfterSystem.TryStartDoAfter(new DoAfterArgs(EntityManager, args.User, uid.Comp.ScanDelay, new MedBookDoAfterEvent(), uid, target: args.Target, used: uid)
        {
            NeedHand = true,
            BreakOnMove = true,
        });

        if (args.Target == args.User || doAfterCancelled || uid.Comp.Silent)
            return;

        var msg = Loc.GetString("medbook-popup-scan-target", ("user", Identity.Entity(args.User, EntityManager)));
        _popupSystem.PopupEntity(msg, args.Target.Value, args.Target.Value, PopupType.Medium);
    }

    private void OnDoAfter(Entity<MedBookComponent> uid, ref MedBookDoAfterEvent args)
    {
        if (args.Handled || args.Cancelled || args.Target == null || !_cell.HasDrawCharge(uid, user: args.User))
            return;

        OpenUserInterface(args.User, uid);
        BeginAnalyzingEntity(uid, args.Target.Value);
        args.Handled = true;
    }

    /// <summary>
    /// Turn off when placed into a storage item or moved between slots/hands
    /// </summary>
    private void OnInsertedIntoContainer(Entity<MedBookComponent> uid, ref EntGotInsertedIntoContainerMessage args)
    {
        if (uid.Comp.ScannedEntity is { } patient)
            _toggle.TryDeactivate(uid.Owner);
    }

    /// <summary>
    /// Disable continuous updates once turned off
    /// </summary>
    private void OnToggled(Entity<MedBookComponent> ent, ref ItemToggledEvent args)
    {
        if (!args.Activated && ent.Comp.ScannedEntity is { } patient)
            StopAnalyzingEntity(ent, patient);
    }

    /// <summary>
    /// Turn off the analyser when dropped
    /// </summary>
    private void OnDropped(Entity<MedBookComponent> uid, ref DroppedEvent args)
    {
        if (uid.Comp.ScannedEntity is { } patient)
            _toggle.TryDeactivate(uid.Owner);
    }

    private void OpenUserInterface(EntityUid user, EntityUid analyzer)
    {
        if (!_uiSystem.HasUi(analyzer, MedBookUiKey.Key))
            return;

        _uiSystem.OpenUi(analyzer, MedBookUiKey.Key, user);
    }

    /// <summary>
    /// Mark the entity as having its health analyzed, and link the analyzer to it
    /// </summary>
    /// <param name="medBook">The health analyzer that should receive the updates</param>
    /// <param name="target">The entity to start analyzing</param>
    /// <param name="part">Shitmed Change: The body part to analyze, if any</param>
    private void BeginAnalyzingEntity(Entity<MedBookComponent> medBook, EntityUid target, EntityUid? part = null)
    {
        //Link the health analyzer to the scanned entity
        medBook.Comp.ScannedEntity = target;
        medBook.Comp.CurrentBodyPart = part; // Shitmed Change

        _toggle.TryActivate(medBook.Owner);

        UpdateScannedUser(medBook, target, true, part); // Shitmed Change
    }

    /// <summary>
    /// Remove the analyzer from the active list, and remove the component if it has no active analyzers
    /// </summary>
    /// <param name="medBook">The health analyzer that's receiving the updates</param>
    /// <param name="target">The entity to analyze</param>
    private void StopAnalyzingEntity(Entity<MedBookComponent> medBook, EntityUid target)
    {
        //Unlink the analyzer
        medBook.Comp.ScannedEntity = null;
        medBook.Comp.CurrentBodyPart = null; // Shitmed Change
        _toggle.TryDeactivate(medBook.Owner);

        UpdateScannedUser(medBook, target, false);
    }

    // Shitmed Change Start
    /// <summary>
    /// Shitmed Change: Handle the selection of a body part on the health analyzer
    /// </summary>
    /// <param name="medBook">The health analyzer that's receiving the updates</param>
    /// <param name="args">The message containing the selected part</param>
    private void OnMedBookPartSelected(Entity<MedBookComponent> medBook, ref MedBookPartMessage args)
    {
        if (!TryGetEntity(args.Owner, out var owner))
            return;

        if (args.BodyPart == null)
        {
            BeginAnalyzingEntity(medBook, owner.Value, null);
        }
        else
        {
            var (targetType, targetSymmetry) = _bodySystem.ConvertTargetBodyPart(args.BodyPart.Value);
            if (_bodySystem.GetBodyChildrenOfType(owner.Value, targetType, symmetry: targetSymmetry) is { } part)
                BeginAnalyzingEntity(medBook, owner.Value, part.FirstOrDefault().Id);
        }
    }
    // Shitmed Change End
    /// <summary>
    /// Send an update for the target to the medBook
    /// </summary>
    /// <param name="medBook">The health analyzer</param>
    /// <param name="target">The entity being scanned</param>
    /// <param name="scanMode">True makes the UI show ACTIVE, False makes the UI show INACTIVE</param>
    /// <param name="part">Shitmed Change: The body part being scanned, if any</param>
    public void UpdateScannedUser(EntityUid medBook, EntityUid target, bool scanMode, EntityUid? part = null)
    {
        if (!_uiSystem.HasUi(medBook, MedBookUiKey.Key))
            return;

        if (!HasComp<DamageableComponent>(target))
            return;

        var bodyTemperature = float.NaN;

        if (TryComp<TemperatureComponent>(target, out var temp))
            bodyTemperature = temp.CurrentTemperature;

        var bloodAmount = float.NaN;
        var bleeding = false;
        var unrevivable = false;

        if (TryComp<BloodstreamComponent>(target, out var bloodstream) &&
            _solutionContainerSystem.ResolveSolution(target, bloodstream.BloodSolutionName,
                ref bloodstream.BloodSolution, out var bloodSolution))
        {
            bloodAmount = bloodSolution.FillFraction;
            bleeding = bloodstream.BleedAmount > 0;
        }
        // Shitmed Change Start
        Dictionary<TargetBodyPart, TargetIntegrity>? body = null;
        if (HasComp<TargetingComponent>(target))
            body = _bodySystem.GetBodyPartStatus(target);
        // Shitmed Change End
        if (TryComp<UnrevivableComponent>(target, out var unrevivableComp) && unrevivableComp.Analyzable)
            unrevivable = true;

        _uiSystem.ServerSendUiMessage(medBook, MedBookUiKey.Key, new MedBookScannedUserMessage(
            GetNetEntity(target),
            bodyTemperature,
            bloodAmount,
            scanMode,
            bleeding,
            unrevivable,
            // Shitmed Change
            body,
            part != null ? GetNetEntity(part) : null
        ));
    }
}