using System.Numerics;
using Content.Shared.DoAfter;
using Content.Shared.Examine;
using Content.Shared.Foldable;
using Content.Shared.Interaction;
using Content.Shared.Popups;
using Content.Shared.Stacks;
using Content.Shared.Verbs;
using Content.Shared.Whitelist;
using Robust.Shared.Audio;
using Robust.Shared.Audio.Systems;
using Robust.Shared.Containers;
using Robust.Shared.Map;
using Robust.Shared.Prototypes;
using Robust.Shared.Serialization;
using Robust.Shared.Timing;

namespace Content.Shared.Salvage.Fulton;

/// <summary>
/// Provides extraction devices that teleports the attached entity after <see cref="FultonDuration"/> elapses to the linked beacon.
/// </summary>
public abstract partial class SharedFultonSystem : EntitySystem
{
    [Dependency] protected readonly IGameTiming Timing = default!;
    [Dependency] private   readonly MetaDataSystem _metadata = default!;
    [Dependency] protected readonly SharedAudioSystem Audio = default!;
    [Dependency] private   readonly SharedDoAfterSystem _doAfter = default!;
    [Dependency] private   readonly FoldableSystem _foldable = default!;
    [Dependency] protected readonly SharedContainerSystem Container = default!;
    [Dependency] private   readonly SharedPopupSystem _popup = default!;
    [Dependency] private   readonly SharedStackSystem _stack = default!;
    [Dependency] protected readonly SharedTransformSystem TransformSystem = default!;
    [Dependency] private readonly EntityWhitelistSystem _whitelistSystem = default!;

    public static readonly EntProtoId EffectProto = "FultonEffect";
    protected static readonly Vector2 EffectOffset = Vector2.Zero;

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

        SubscribeLocalEvent<FultonedDoAfterEvent>(OnFultonDoAfter);

        SubscribeLocalEvent<FultonedComponent, GetVerbsEvent<InteractionVerb>>(OnFultonedGetVerbs);
        SubscribeLocalEvent<FultonedComponent, ExaminedEvent>(OnFultonedExamine);
        SubscribeLocalEvent<FultonedComponent, EntGotInsertedIntoContainerMessage>(OnFultonContainerInserted);

        SubscribeLocalEvent<FultonComponent, AfterInteractEvent>(OnFultonInteract);

        SubscribeLocalEvent<FultonComponent, StackSplitEvent>(OnFultonSplit);
    }

    private void OnFultonContainerInserted(EntityUid uid, FultonedComponent component, EntGotInsertedIntoContainerMessage args)
    {
        RemCompDeferred<FultonedComponent>(uid);
    }

    private void OnFultonedExamine(EntityUid uid, FultonedComponent component, ExaminedEvent args)
    {
        var remaining = component.NextFulton + _metadata.GetPauseTime(uid) - Timing.CurTime;
        var message = Loc.GetString("fulton-examine", ("time", $"{remaining.TotalSeconds:0.00}"));

        args.PushText(message);
    }

    private void OnFultonedGetVerbs(EntityUid uid, FultonedComponent component, GetVerbsEvent<InteractionVerb> args)
    {
        if (!args.CanAccess || !args.CanInteract)
            return;

        args.Verbs.Add(new InteractionVerb()
        {
            Text = Loc.GetString("fulton-remove"),
            Act = () =>
            {
                Unfulton(uid);
            }
        });
    }

    private void Unfulton(EntityUid uid, FultonedComponent? component = null)
    {
        if (!Resolve(uid, ref component, false) || !component.Removeable)
            return;

        RemCompDeferred<FultonedComponent>(uid);
    }

    private void OnFultonDoAfter(FultonedDoAfterEvent args)
    {
        if (args.Cancelled || args.Target == null || !TryComp<FultonComponent>(args.Used, out var fulton))
            return;

        if (!_stack.TryUse(args.Used.Value, 1))
        {
            return;
        }

        var fultoned = AddComp<FultonedComponent>(args.Target.Value);
        fultoned.Beacon = fulton.Beacon;
        fultoned.NextFulton = Timing.CurTime + fulton.FultonDuration;
        fultoned.FultonDuration = fulton.FultonDuration;
        fultoned.Removeable = fulton.Removeable;
        UpdateAppearance(args.Target.Value, fultoned);
        Dirty(args.Target.Value, fultoned);
        Audio.PlayPredicted(fulton.FultonSound, args.Target.Value, args.User);
    }

    private void OnFultonInteract(EntityUid uid, FultonComponent component, AfterInteractEvent args)
    {
        if (args.Target == null || args.Handled || !args.CanReach)
            return;

        if (TryComp<FultonBeaconComponent>(args.Target, out var beacon))
        {
            if (!_foldable.IsFolded(args.Target.Value))
            {
                component.Beacon = args.Target.Value;
                Audio.PlayPredicted(beacon.LinkSound, uid, args.User);
                _popup.PopupClient(Loc.GetString("fulton-linked"), uid, args.User);
            }
            else
            {
                component.Beacon = EntityUid.Invalid;
                _popup.PopupClient(Loc.GetString("fulton-folded"), uid, args.User);
            }

            return;
        }

        if (Deleted(component.Beacon))
        {
            _popup.PopupClient(Loc.GetString("fulton-not-found"), uid, args.User);
            return;
        }

        if (!CanApplyFulton(args.Target.Value, component))
        {
            _popup.PopupClient(Loc.GetString("fulton-invalid"), uid, uid);
            return;
        }

        if (HasComp<FultonedComponent>(args.Target))
        {
            _popup.PopupClient(Loc.GetString("fulton-fultoned"), uid, uid);
            return;
        }

        args.Handled = true;

        var ev = new FultonedDoAfterEvent();
        _doAfter.TryStartDoAfter(
            new DoAfterArgs(EntityManager, args.User, component.ApplyFultonDuration, ev, args.Target, args.Target, args.Used)
            {
                MovementThreshold = 0.5f,
                BreakOnMove = true,
                Broadcast = true,
                NeedHand = true,
            });
    }

    private void OnFultonSplit(EntityUid uid, FultonComponent component, ref StackSplitEvent args)
    {
        var newFulton = EnsureComp<FultonComponent>(args.NewId);
        newFulton.Beacon = component.Beacon;
        Dirty(args.NewId, newFulton);
    }

    protected virtual void UpdateAppearance(EntityUid uid, FultonedComponent fultoned)
    {
        return;
    }

    protected bool CanApplyFulton(EntityUid targetUid, FultonComponent component)
    {
        if (!CanFulton(targetUid))
            return false;

        if (_whitelistSystem.IsWhitelistFailOrNull(component.Whitelist, targetUid))
            return false;

        return true;
    }

    protected bool CanFulton(EntityUid uid)
    {
        var xform = Transform(uid);

        if (xform.Anchored)
            return false;

        // Shouldn't need recursive container checks I think.
        if (Container.IsEntityInContainer(uid))
            return false;

        return true;
    }

    [Serializable, NetSerializable]
    private sealed partial class FultonedDoAfterEvent : SimpleDoAfterEvent
    {
    }

    // Animations aren't really good for networking hence this.
    /// <summary>
    /// Tells clients to play the fulton animation.
    /// </summary>
    [Serializable, NetSerializable]
    protected sealed class FultonAnimationMessage : EntityEventArgs
    {
        public NetEntity Entity;
        public NetCoordinates Coordinates;
    }
}