using Content.Shared.Popups;
using Content.Shared.Damage;
using Content.Shared.MobState.Components;
using Content.Server.DoAfter;
using Content.Shared.Revenant;
using Robust.Shared.Random;
using Robust.Shared.Player;
using Robust.Shared.Map;
using Content.Shared.Tag;
using Content.Shared.Maps;
using Content.Server.Storage.Components;
using Content.Server.Light.Components;
using Content.Server.Ghost;
using Robust.Shared.Physics;
using Content.Shared.Throwing;
using Content.Server.Storage.EntitySystems;
using Content.Shared.Interaction;
using Content.Server.Disease;
using Content.Server.Disease.Components;
using Content.Shared.Item;
using Content.Shared.Bed.Sleep;
using Content.Shared.MobState;
using Content.Server.Explosion.EntitySystems;
using System.Linq;
using Content.Server.Emag;
using Content.Shared.CharacterAppearance.Components;
using Robust.Shared.Utility;

namespace Content.Server.Revenant.EntitySystems;

public sealed partial class RevenantSystem : EntitySystem
{
    [Dependency] private readonly IMapManager _mapManager = default!;
    [Dependency] private readonly ThrowingSystem _throwing = default!;
    [Dependency] private readonly EntityStorageSystem _entityStorage = default!;
    [Dependency] private readonly DiseaseSystem _disease = default!;
    [Dependency] private readonly ExplosionSystem _explosion = default!;
    [Dependency] private readonly EmagSystem _emag = default!;
    [Dependency] private readonly SharedAppearanceSystem _appearance = default!;
    [Dependency] private readonly GhostSystem _ghost = default!;

    private void InitializeAbilities()
    {
        SubscribeLocalEvent<RevenantComponent, InteractNoHandEvent>(OnInteract);
        SubscribeLocalEvent<RevenantComponent, SoulSearchDoAfterComplete>(OnSoulSearchComplete);
        SubscribeLocalEvent<RevenantComponent, HarvestDoAfterComplete>(OnHarvestComplete);
        SubscribeLocalEvent<RevenantComponent, HarvestDoAfterCancelled>(OnHarvestCancelled);

        SubscribeLocalEvent<RevenantComponent, RevenantDefileActionEvent>(OnDefileAction);
        SubscribeLocalEvent<RevenantComponent, RevenantOverloadLightsActionEvent>(OnOverloadLightsAction);
        SubscribeLocalEvent<RevenantComponent, RevenantBlightActionEvent>(OnBlightAction);
        SubscribeLocalEvent<RevenantComponent, RevenantMalfunctionActionEvent>(OnMalfunctionAction);
    }

    private void OnInteract(EntityUid uid, RevenantComponent component, InteractNoHandEvent args)
    {
        var target = args.Target;
        if (target == args.User)
            return;

        if (HasComp<PoweredLightComponent>(target))
        {
            args.Handled = _ghost.DoGhostBooEvent(target);
            return;
        }

        if (!HasComp<MobStateComponent>(target) || !HasComp<HumanoidAppearanceComponent>(target) || HasComp<RevenantComponent>(target))
            return;

        if (!_interact.InRangeUnobstructed(uid, target))
            return;

        args.Handled = true;
        if (!TryComp<EssenceComponent>(target, out var essence) || !essence.SearchComplete)
        {
            EnsureComp<EssenceComponent>(target);
            BeginSoulSearchDoAfter(uid, target, component);
        }
        else
        {
            BeginHarvestDoAfter(uid, target, component, essence);
        }
    }

    private void BeginSoulSearchDoAfter(EntityUid uid, EntityUid target, RevenantComponent revenant)
    {
        _popup.PopupEntity(Loc.GetString("revenant-soul-searching", ("target", target)), uid, Filter.Entities(uid), PopupType.Medium);
        revenant.SoulSearchCancelToken = new();
        var searchDoAfter = new DoAfterEventArgs(uid, revenant.SoulSearchDuration, revenant.SoulSearchCancelToken.Token, target)
        {
            BreakOnUserMove = true,
            DistanceThreshold = 2,
            UserFinishedEvent = new SoulSearchDoAfterComplete(target),
        };
        _doAfter.DoAfter(searchDoAfter);
    }

    private void OnSoulSearchComplete(EntityUid uid, RevenantComponent component, SoulSearchDoAfterComplete args)
    {
        if (!TryComp<EssenceComponent>(args.Target, out var essence))
            return;
        essence.SearchComplete = true;

        string message;
        switch (essence.EssenceAmount)
        {
            case <= 45:
                message = "revenant-soul-yield-low";
                break;
            case >= 90:
                message = "revenant-soul-yield-high";
                break;
            default:
                message = "revenant-soul-yield-average";
                break;
        }
        _popup.PopupEntity(Loc.GetString(message, ("target", args.Target)), args.Target, Filter.Entities(uid), PopupType.Medium);
    }

    private void BeginHarvestDoAfter(EntityUid uid, EntityUid target, RevenantComponent revenant, EssenceComponent essence)
    {
        if (essence.Harvested)
        {
            _popup.PopupEntity(Loc.GetString("revenant-soul-harvested"), target, Filter.Entities(uid), PopupType.SmallCaution);
            return;
        }

        if (TryComp<MobStateComponent>(target, out var mobstate) && mobstate.CurrentState == DamageState.Alive && !HasComp<SleepingComponent>(target))
        {
            _popup.PopupEntity(Loc.GetString("revenant-soul-too-powerful"), target, Filter.Entities(uid));
            return;
        }

        revenant.HarvestCancelToken = new();
        var doAfter = new DoAfterEventArgs(uid, revenant.HarvestDebuffs.X, revenant.HarvestCancelToken.Token, target)
        {
            DistanceThreshold = 2,
            BreakOnUserMove = true,
            NeedHand = false,
            UserFinishedEvent = new HarvestDoAfterComplete(target),
            UserCancelledEvent = new HarvestDoAfterCancelled(),
        };

        _appearance.SetData(uid, RevenantVisuals.Harvesting, true);

        _popup.PopupEntity(Loc.GetString("revenant-soul-begin-harvest", ("target", target)),
            target, Filter.Pvs(target), PopupType.Large);

        TryUseAbility(uid, revenant, 0, revenant.HarvestDebuffs);
        _doAfter.DoAfter(doAfter);
    }

    private void OnHarvestComplete(EntityUid uid, RevenantComponent component, HarvestDoAfterComplete args)
    {
        _appearance.SetData(uid, RevenantVisuals.Harvesting, false);

        if (!TryComp<EssenceComponent>(args.Target, out var essence))
            return;

        _popup.PopupEntity(Loc.GetString("revenant-soul-finish-harvest", ("target", args.Target)),
            args.Target, Filter.Pvs(args.Target), PopupType.LargeCaution);

        essence.Harvested = true;
        ChangeEssenceAmount(uid, essence.EssenceAmount, component);
        component.StolenEssence += essence.EssenceAmount;

        if (!TryComp<MobStateComponent>(args.Target, out var mobstate))
            return;

        if (_mobState.IsAlive(args.Target) || _mobState.IsCritical(args.Target))
        {
            _popup.PopupEntity(Loc.GetString("revenant-max-essence-increased"), uid, Filter.Entities(uid));
            component.EssenceRegenCap += component.MaxEssenceUpgradeAmount;
        }

        //KILL THEMMMM
        var damage = _mobState.GetEarliestDeadState(mobstate, 0)?.threshold;
        if (damage == null)
            return;
        DamageSpecifier dspec = new();
        dspec.DamageDict.Add("Cellular", damage.Value);
        _damage.TryChangeDamage(args.Target, dspec, true);
    }

    private void OnHarvestCancelled(EntityUid uid, RevenantComponent component, HarvestDoAfterCancelled args)
    {
        _appearance.SetData(uid, RevenantVisuals.Harvesting, false);
    }

    private void OnDefileAction(EntityUid uid, RevenantComponent component, RevenantDefileActionEvent args)
    {
        if (args.Handled)
            return;

        if (!TryUseAbility(uid, component, component.DefileCost, component.DefileDebuffs))
            return;

        args.Handled = true;

        //var coords = Transform(uid).Coordinates;
        //var gridId = coords.GetGridUid(EntityManager);
        var xform = Transform(uid);
        if (!_mapManager.TryGetGrid(xform.GridUid, out var map))
            return;
        var tiles = map.GetTilesIntersecting(Box2.CenteredAround(xform.WorldPosition,
            (component.DefileRadius*2, component.DefileRadius))).ToArray();

        _random.Shuffle(tiles);

        for (var i = 0; i < component.DefileTilePryAmount; i++)
        {
            if (!tiles.TryGetValue(i, out var value))
                continue;
            value.PryTile();
        }

        var lookup = _lookup.GetEntitiesInRange(uid, component.DefileRadius, LookupFlags.Approximate | LookupFlags.Anchored);
        var tags = GetEntityQuery<TagComponent>();
        var entityStorage = GetEntityQuery<EntityStorageComponent>();
        var items = GetEntityQuery<ItemComponent>();
        var lights = GetEntityQuery<PoweredLightComponent>();

        foreach (var ent in lookup)
        {
            //break windows
            if (tags.HasComponent(ent) && _tag.HasAnyTag(ent, "Window"))
            {
                //hardcoded damage specifiers til i die.
                var dspec = new DamageSpecifier();
                dspec.DamageDict.Add("Structural", 15);
                _damage.TryChangeDamage(ent, dspec);
            }

            if (!_random.Prob(component.DefileEffectChance))
                continue;

            //randomly opens some lockers and such.
            if (entityStorage.TryGetComponent(ent, out var entstorecomp))
                _entityStorage.OpenStorage(ent, entstorecomp);

            //chucks shit
            if (items.HasComponent(ent) &&
                TryComp<PhysicsComponent>(ent, out var phys) && phys.BodyType != BodyType.Static)
                _throwing.TryThrow(ent, _random.NextAngle().ToWorldVec());

            //flicker lights
            if (lights.HasComponent(ent))
                _ghost.DoGhostBooEvent(ent);
        }
    }

    private void OnOverloadLightsAction(EntityUid uid, RevenantComponent component, RevenantOverloadLightsActionEvent args)
    {
        if (args.Handled)
            return;

        if (!TryUseAbility(uid, component, component.OverloadCost, component.OverloadDebuffs))
            return;

        args.Handled = true;

        var poweredLights = GetEntityQuery<PoweredLightComponent>();
        var lookup = _lookup.GetEntitiesInRange(uid, component.OverloadRadius);

        foreach (var ent in lookup)
        {
            if (!poweredLights.HasComponent(ent))
                continue;

            var ev = new GhostBooEvent(); //light go flicker
            RaiseLocalEvent(ent, ev);

            if (_random.Prob(component.OverloadBreakChance))
            {
                //values
                _explosion.QueueExplosion(ent, "RevenantElectric", 15, 3, 5, canCreateVacuum: false);
            }
        }
    }

    private void OnBlightAction(EntityUid uid, RevenantComponent component, RevenantBlightActionEvent args)
    {
        if (args.Handled)
            return;

        if (!TryUseAbility(uid, component, component.BlightCost, component.BlightDebuffs))
            return;

        args.Handled = true;

        var emo = GetEntityQuery<DiseaseCarrierComponent>();

        foreach (var ent in _lookup.GetEntitiesInRange(uid, component.BlightRadius))
            if (emo.TryGetComponent(ent, out var comp))
                _disease.TryInfect(comp, component.BlightDiseasePrototypeId);
    }

    private void OnMalfunctionAction(EntityUid uid, RevenantComponent component, RevenantMalfunctionActionEvent args)
    {
        if (args.Handled)
            return;

        if (!TryUseAbility(uid, component, component.MalfunctionCost, component.MalfunctionDebuffs))
            return;

        args.Handled = true;

        foreach (var ent in _lookup.GetEntitiesInRange(uid, component.MalfunctionRadius))
            _emag.DoEmag(ent, ent); //it emags itself. spooky.
    }
}