using Content.Server.Atmos.Rotting;
using Content.Server.Body.Systems;
using Content.Server.Chat.Systems;
using Content.Shared.Body.Organ;
using Content.Shared.Body.Part;
using Content.Server.Popups;
using Content.Shared.Bed.Sleep;
using Content.Shared.CCVar;
using Content.Shared.Damage;
using Content.Shared.Eye.Blinding.Components;
using Content.Shared.Eye.Blinding.Systems;
using Content.Shared.Interaction;
using Content.Shared.Inventory;
using Content.Shared._DV.Surgery; // DeltaV: expanded anesthesia
using Content.Server._DV.Surgery; // DeltaV: surgery cross contamination
using Content.Shared.FixedPoint; // DeltaV: surgery cross contamination
using Content.Shared.Forensics.Components; // DeltaV: surgery cross contamination
using Content.Shared.Damage.Prototypes; // DeltaV: surgery cross contamination
using Content.Shared._Shitmed.Medical.Surgery;
using Content.Shared._Shitmed.Medical.Surgery.Conditions;
using Content.Shared._Shitmed.Medical.Surgery.Effects.Step;
using Content.Shared._Shitmed.Medical.Surgery.Steps;
using Content.Shared._Shitmed.Medical.Surgery.Steps.Parts;
using Content.Shared._Shitmed.Medical.Surgery.Tools;
using Robust.Server.GameObjects;
using Robust.Shared.Configuration;
using Robust.Shared.Player;
using Robust.Shared.Prototypes;
using Robust.Shared.Utility;
using System.Linq;
using Content.Shared.Verbs;
using Content.Shared._Goobstation.CCVar;

namespace Content.Server._Shitmed.Medical.Surgery;

public sealed class SurgerySystem : SharedSurgerySystem
{
    [Dependency] private readonly BodySystem _body = default!;
    [Dependency] private readonly ChatSystem _chat = default!;
    [Dependency] private readonly IConfigurationManager _config = default!;
    [Dependency] private readonly DamageableSystem _damageable = default!;
    [Dependency] private readonly IPrototypeManager _prototypes = default!;
    [Dependency] private readonly PopupSystem _popup = default!;
    [Dependency] private readonly UserInterfaceSystem _ui = default!;
    [Dependency] private readonly RottingSystem _rot = default!;
    [Dependency] private readonly BlindableSystem _blindableSystem = default!;
    [Dependency] private readonly InventorySystem _inventory = default!; // DeltaV: surgery cross contamination

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

        SubscribeLocalEvent<SurgeryToolComponent, GetVerbsEvent<UtilityVerb>>(OnUtilityVerb);
        SubscribeLocalEvent<SurgeryTargetComponent, SurgeryStepDamageEvent>(OnSurgeryStepDamage);
        SubscribeLocalEvent<SurgeryTargetComponent, SurgeryDirtinessEvent>(OnSurgerySanitation); // DeltaV: surgery cross contamination
        // You might be wondering "why aren't we using StepEvent for these two?" reason being that StepEvent fires off regardless of success on the previous functions
        // so this would heal entities even if you had a used or incorrect organ.
        SubscribeLocalEvent<SurgerySpecialDamageChangeEffectComponent, SurgeryStepDamageChangeEvent>(OnSurgerySpecialDamageChange);
        SubscribeLocalEvent<SurgeryDamageChangeEffectComponent, SurgeryStepEvent>(OnSurgeryDamageChange); // DeltaV: Use SurgeryStepEvent so steps can actually damage the patient
        SubscribeLocalEvent<SurgeryStepEmoteEffectComponent, SurgeryStepEvent>(OnStepScreamComplete);
        SubscribeLocalEvent<SurgeryStepSpawnEffectComponent, SurgeryStepEvent>(OnStepSpawnComplete);
    }

    protected override void RefreshUI(EntityUid body)
    {
        var surgeries = new Dictionary<NetEntity, List<EntProtoId>>();
        foreach (var surgery in AllSurgeries)
        {
            if (GetSingleton(surgery) is not { } surgeryEnt)
                continue;

            foreach (var part in _body.GetBodyChildren(body))
            {
                var ev = new SurgeryValidEvent(body, part.Id);
                RaiseLocalEvent(surgeryEnt, ref ev);

                if (ev.Cancelled)
                    continue;

                surgeries.GetOrNew(GetNetEntity(part.Id)).Add(surgery);
            }

        }
        _ui.SetUiState(body, SurgeryUIKey.Key, new SurgeryBuiState(surgeries));
        /*
            Reason we do this is because when applying a BUI State, it rolls back the state on the entity temporarily,
            which just so happens to occur right as we're checking for step completion, so we end up with the UI
            not updating at all until you change tools or reopen the window. I love shitcode.
        */
        _ui.ServerSendUiMessage(body, SurgeryUIKey.Key, new SurgeryBuiRefreshMessage());
    }
    private void SetDamage(EntityUid body,
        DamageSpecifier damage,
        float partMultiplier,
        EntityUid user,
        EntityUid part)
    {
        if (!TryComp<BodyPartComponent>(part, out var partComp))
            return;

        _damageable.TryChangeDamage(body,
            damage,
            true,
            origin: user,
            canSever: false,
            partMultiplier: partMultiplier,
            targetPart: _body.GetTargetBodyPart(partComp));
    }

    private void AttemptStartSurgery(Entity<SurgeryToolComponent> ent, EntityUid user, EntityUid target)
    {
        if (!IsLyingDown(target, user))
            return;

        if (user == target && !_config.GetCVar(GoobCVars.CanOperateOnSelf))
        {
            _popup.PopupEntity(Loc.GetString("surgery-error-self-surgery"), user, user);
            return;
        }

        _ui.OpenUi(target, SurgeryUIKey.Key, user);
        RefreshUI(target);
    }

    private void OnUtilityVerb(Entity<SurgeryToolComponent> ent, ref GetVerbsEvent<UtilityVerb> args)
    {
        if (!args.CanInteract
            || !args.CanAccess
            || !HasComp<SurgeryTargetComponent>(args.Target))
            return;

        var user = args.User;
        var target = args.Target;

        var verb = new UtilityVerb()
        {
            Act = () => AttemptStartSurgery(ent, user, target),
            Icon = new SpriteSpecifier.Rsi(new("/Textures/Objects/Specific/Medical/Surgery/scalpel.rsi/"), "scalpel"),
            Text = Loc.GetString("surgery-verb-text"),
            Message = Loc.GetString("surgery-verb-message"),
            DoContactInteraction = true
        };

        args.Verbs.Add(verb);
    }

    private void OnSurgeryStepDamage(Entity<SurgeryTargetComponent> ent, ref SurgeryStepDamageEvent args) =>
        SetDamage(args.Body, args.Damage, args.PartMultiplier, args.User, args.Part);

    // Begin DeltaV: surgery cross contamination
    private FixedPoint2 Dirtiness(EntityUid entity)
    {
        var comp = EnsureComp<SurgeryDirtinessComponent>(entity);
        return comp.Dirtiness;
    }

    private HashSet<string> CrossContaminants(EntityUid entity)
    {
        var comp = EnsureComp<SurgeryCrossContaminationComponent>(entity);
        return comp.DNAs;
    }

    public FixedPoint2 TotalDirtiness(EntityUid user, List<EntityUid> tools, Entity<DnaComponent, SurgeryContaminableComponent> target)
    {
        var total = FixedPoint2.Zero;
        var dnas = new HashSet<string>();

        if (HasComp<SurgerySelfDirtyComponent>(user))
        {
            total += Dirtiness(user);
            dnas.UnionWith(CrossContaminants(user));
        }
        else
        {
            if (_inventory.TryGetSlotEntity(user, "gloves", out var glovesEntity))
            {
                total += Dirtiness(glovesEntity.Value);
                dnas.UnionWith(CrossContaminants(glovesEntity.Value));
            }

            foreach (var tool in tools)
            {
                total += Dirtiness(tool);
                dnas.UnionWith(CrossContaminants(tool));
            }
        }

        dnas.Remove(target.Comp1.DNA);

        return total + dnas.Count * target.Comp2.CrossContaminationDirtinessLevel;
    }

    public FixedPoint2 DamageToBeDealt(Entity<SurgeryContaminableComponent> ent, FixedPoint2 dirtiness)
    {
        if (ent.Comp.DirtinessThreshold > dirtiness)
        {
            return 0;
        }

        var exceedsAmount = (dirtiness - ent.Comp.DirtinessThreshold).Float();
        var additionalDamage = (1f / ent.Comp.InverseDamageCoefficient.Float()) * (exceedsAmount * exceedsAmount);

        return FixedPoint2.Min(FixedPoint2.New(additionalDamage) + ent.Comp.BaseDamage, ent.Comp.ToxinStepLimit);
    }

    private void AddDirt(EntityUid ent, FixedPoint2 amount)
    {
        var dirtiness = EnsureComp<SurgeryDirtinessComponent>(ent);
        dirtiness.Dirtiness += amount;
        Dirty(ent, dirtiness);
    }

    private void AddDNA(EntityUid ent, string dna)
    {
        var contamination = EnsureComp<SurgeryCrossContaminationComponent>(ent);
        contamination.DNAs.Add(dna);
    }

    private void OnSurgerySanitation(Entity<SurgeryTargetComponent> target, ref Content.Shared._DV.Surgery.SurgeryDirtinessEvent args)
    {
        if (!TryComp<SurgeryContaminableComponent>(target.Owner, out var contaminableComp))
            return;

        if (!TryComp<DnaComponent>(target.Owner, out var dnaComp))
            return;

        var dirtiness = TotalDirtiness(args.User, args.Tools, new(target.Owner, dnaComp, contaminableComp));
        var damage = DamageToBeDealt(new(target.Owner, contaminableComp), dirtiness);

        if (damage > 0)
        {
            var sepsis = new DamageSpecifier(_prototypes.Index<DamageTypePrototype>("Poison"), damage);
            SetDamage(target.Owner, sepsis, 0.5f, args.User, args.Part);
        }

        if (!TryComp<SurgeryStepDirtinessComponent>(args.Step, out var surgicalStepDirtiness))
            return;

        if (HasComp<SurgerySelfDirtyComponent>(args.User))
        {
            AddDirt(args.User, surgicalStepDirtiness.ToolDirtiness);
            AddDNA(args.User, dnaComp.DNA);
            return;
        }

        if (_inventory.TryGetSlotEntity(args.User, "gloves", out var glovesEntity))
        {
            AddDirt(glovesEntity.Value, surgicalStepDirtiness.GloveDirtiness);
            AddDNA(glovesEntity.Value, dnaComp.DNA);
        }
        foreach (var tool in args.Tools)
        {
            AddDirt(tool, surgicalStepDirtiness.ToolDirtiness);
            AddDNA(tool, dnaComp.DNA);
        }
    }

    // End DeltaV: surgery cross contamination

    private void OnSurgeryDamageChange(Entity<SurgeryDamageChangeEffectComponent> ent, ref SurgeryStepEvent args) // DeltaV
    {
        var damageChange = ent.Comp.Damage;
        if (HasComp<AnesthesiaComponent>(args.Body)) // DeltaV: anesthesia
            damageChange = damageChange * ent.Comp.SleepModifier;

        SetDamage(args.Body, damageChange, 0.5f, args.User, args.Part);
    }

    private void OnSurgerySpecialDamageChange(Entity<SurgerySpecialDamageChangeEffectComponent> ent, ref SurgeryStepDamageChangeEvent args)
    {
        // Im killing this shit soon too, inshallah.
        if (ent.Comp.DamageType == "Rot")
            _rot.ReduceAccumulator(args.Body, TimeSpan.FromSeconds(2147483648)); // BEHOLD, SHITCODE THAT I JUST COPY PASTED. I'll redo it at some point, pinky swear :)
        /*else if (ent.Comp.DamageType == "Eye"
            && TryComp(ent, out BlindableComponent? blindComp)
            && blindComp.EyeDamage > 0)
            _blindableSystem.AdjustEyeDamage((args.Body, blindComp), -blindComp!.EyeDamage);*/
    }

    private void OnStepScreamComplete(Entity<SurgeryStepEmoteEffectComponent> ent, ref SurgeryStepEvent args)
    {
        if (HasComp<AnesthesiaComponent>(args.Body)) // DeltaV: anesthesia
            return;

        _chat.TryEmoteWithChat(args.Body, ent.Comp.Emote);
    }
    private void OnStepSpawnComplete(Entity<SurgeryStepSpawnEffectComponent> ent, ref SurgeryStepEvent args) =>
        SpawnAtPosition(ent.Comp.Entity, Transform(args.Body).Coordinates);
}