using System.Collections.Concurrent;
using Content.Shared.Atmos.EntitySystems;
using Content.Shared.Atmos.Serialization;
using Content.Shared.NodeContainer.NodeGroups;

namespace Content.Shared.Atmos.Components;

/// <summary>
/// Internal <see cref="SharedAtmosphereSystem"/> class for storing all grid data.
/// If you need to access this data, use the API methods in the <see cref="SharedAtmosphereSystem"/>/server
/// instead of trying to scour this component or others for the data you need.
/// </summary>
[RegisterComponent, Serializable,
 Access(typeof(SharedAtmosphereSystem), typeof(SharedGasTileOverlaySystem), typeof(SharedAtmosDebugOverlaySystem))]
public sealed partial class GridAtmosphereComponent : Component
{
    /// <summary>
    /// Whether the grid is being updated by Atmospherics.
    /// </summary>
    [ViewVariables(VVAccess.ReadWrite)]
    public bool Simulated = true;

    /// <summary>
    /// Indicator for if Atmospherics has delegated the processing of this
    /// grid to another tick due to the time budget running out.
    /// </summary>
    /// <example>If true, Atmospherics is not finished
    /// processing the current stage and has yielded processing
    /// to the next tick.</example>
    [ViewVariables]
    public bool ProcessingPaused;

    /// <summary>
    /// Timer used to delay processing for every AtmosTick.
    /// No, Atmospherics cannot tick every frame.
    /// </summary>
    /// TODO: Replace with TimeSpan please.
    [ViewVariables]
    public float Timer;

    /// <summary>
    /// Integer that is incremented every time the grid is processed by Atmospherics.
    /// Used in multiple subsystems to prevent double-copy/processing of data.
    /// </summary>
    /// <remarks>Do not set to zero by default.
    /// You will break roundstart atmos otherwise.</remarks>
    [ViewVariables]
    public int UpdateCounter = 1;

    [ViewVariables]
    [IncludeDataField(customTypeSerializer:typeof(TileAtmosCollectionSerializer))]
    public Dictionary<Vector2i, TileAtmosphere> Tiles = new(1000);

    [ViewVariables]
    public HashSet<TileAtmosphere> MapTiles = new(1000);

    [ViewVariables]
    public readonly HashSet<TileAtmosphere> ActiveTiles = new(1000);

    [ViewVariables]
    public int ActiveTilesCount => ActiveTiles.Count;

    [ViewVariables]
    public readonly HashSet<ExcitedGroup> ExcitedGroups = new(1000);

    [ViewVariables]
    public int ExcitedGroupCount => ExcitedGroups.Count;

    [ViewVariables]
    public readonly HashSet<TileAtmosphere> HotspotTiles = new(1000);

    [ViewVariables]
    public int HotspotTilesCount => HotspotTiles.Count;

    [ViewVariables]
    public readonly HashSet<TileAtmosphere> SuperconductivityTiles = new(1000);

    [ViewVariables]
    public int SuperconductivityTilesCount => SuperconductivityTiles.Count;

    [ViewVariables]
    public HashSet<TileAtmosphere> HighPressureDelta = new(1000);

    [ViewVariables]
    public int HighPressureDeltaCount => HighPressureDelta.Count;

    /// <summary>
    /// A list of entities that have a <see cref="DeltaPressureComponent"/> and are to
    /// be processed by the <see cref="DeltaPressureSystem"/>, if enabled.
    ///
    /// To prevent massive bookkeeping overhead, this list is processed in-place,
    /// with add/remove/find operations helped via a dict.
    /// </summary>
    /// <remarks>If you want to add/remove/find entities in this list,
    /// use the API methods in the Atmospherics API.</remarks>
    [ViewVariables]
    public readonly List<Entity<DeltaPressureComponent>> DeltaPressureEntities =
        new(SharedAtmosphereSystem.DeltaPressurePreAllocateLength);

    /// <summary>
    /// An index lookup for the <see cref="DeltaPressureEntities"/> list.
    /// Used for add/remove/find operations to speed up processing.
    /// </summary>
    public readonly Dictionary<EntityUid, int> DeltaPressureEntityLookup =
        new(SharedAtmosphereSystem.DeltaPressurePreAllocateLength);

    /// <summary>
    /// Integer that indicates the current position in the
    /// <see cref="DeltaPressureEntities"/> list that is being processed.
    /// </summary>
    [ViewVariables(VVAccess.ReadOnly)]
    public int DeltaPressureCursor;

    /// <summary>
    /// Queue of entities that need to have damage applied to them.
    /// </summary>
    [ViewVariables]
    public readonly ConcurrentQueue<DeltaPressureDamageResult> DeltaPressureDamageResults = new();

    [ViewVariables]
    public readonly HashSet<IPipeNet> PipeNets = new();

    [ViewVariables]
    public readonly HashSet<Entity<AtmosDeviceComponent>> AtmosDevices = new();

    [ViewVariables]
    public readonly Queue<TileAtmosphere> CurrentRunTiles = new();

    [ViewVariables]
    public readonly Queue<ExcitedGroup> CurrentRunExcitedGroups = new();

    [ViewVariables]
    public readonly Queue<IPipeNet> CurrentRunPipeNet = new();

    [ViewVariables]
    public readonly Queue<Entity<AtmosDeviceComponent>> CurrentRunAtmosDevices = new();

    [ViewVariables]
    public readonly HashSet<Vector2i> InvalidatedCoords = new(1000);

    [ViewVariables]
    public readonly Queue<TileAtmosphere> CurrentRunInvalidatedTiles = new();

    [ViewVariables]
    public readonly List<TileAtmosphere> PossiblyDisconnectedTiles = new(100);

    [ViewVariables]
    public int InvalidatedCoordsCount => InvalidatedCoords.Count;

    [ViewVariables]
    public long EqualizationQueueCycleControl { get; set; }

    [ViewVariables]
    public AtmosphereProcessingState State { get; set; } = AtmosphereProcessingState.Revalidate;
}