using AcDream.Core.Items;
using AcDream.Core.Net;
using AcDream.Core.Net.Messages;

namespace AcDream.Core.Net.Tests;

/// <summary>
/// D.5.4 Task 7 — ObjectTableWiring.
///
/// WorldSession.EntitySpawned/EntityDeleted have no in-process test seam (the
/// ctor opens a UDP socket), so the subscription wiring is tested via the guard
/// logic extracted as a local handler — this is the same lambda body that
/// ObjectTableWiring.Wire wires to session.EntityDeleted.  The retail two-table
/// semantics are: PickupEvent (0xF74A) removes from the 3-D object_table but
/// KEEPS the weenie in ClientObjectTable; DeleteObject (0xF747) evicts the
/// weenie from both.  FromPickup = true guards the eviction.
/// </summary>
public sealed class ObjectTableWiringTests
{
    [Fact]
    public void ToWeenieData_CopiesFieldsFromSpawn()
    {
        // Every EntitySpawn item field is set to a DISTINCT recognisable value so
        // a positional transposition in ObjectTableWiring.ToWeenieData would trip
        // at least one Assert.  All 22 WeenieData fields are verified below.
        var spawn = new WorldSession.EntitySpawn(
            Guid: 0x00000600u,
            Position: null,
            SetupTableId: null,
            AnimPartChanges: System.Array.Empty<CreateObject.AnimPartChange>(),
            TextureChanges: System.Array.Empty<CreateObject.TextureChange>(),
            SubPalettes: System.Array.Empty<CreateObject.SubPaletteSwap>(),
            BasePaletteId: null,
            ObjScale: null,
            Name: "Iron Sword",
            ItemType: (uint)ItemType.MeleeWeapon,
            MotionState: null,
            MotionTableId: null)
            with
            {
                WeenieClassId             = 0x00001001u,
                IconId                    = 0x06001111u,
                IconOverlayId             = 0x06002222u,
                IconUnderlayId            = 0x06003333u,
                UiEffects                 = 0x00000004u,
                Value                     = 7,
                StackSize                 = 1,
                StackSizeMax              = 1,
                Burden                    = 300,
                ContainerId               = 0x000000C9u,
                WielderId                 = 0x000000DAu,
                ValidLocations            = 0x00000012u,   // MeleeWeapon wield mask
                CurrentWieldedLocation    = 0x00000002u,   // right-hand
                Priority                  = 0x00000005u,
                ItemsCapacity             = 0,
                ContainersCapacity        = 0,
                Structure                 = 80,
                MaxStructure              = 100,
                Workmanship               = 4.5f,
            };

        var d = ObjectTableWiring.ToWeenieData(spawn);

        // --- identity ---
        Assert.Equal(0x00000600u, d.Guid);
        Assert.Equal("Iron Sword",             d.Name);
        Assert.Equal(ItemType.MeleeWeapon,     d.Type);

        // --- weenie / icon ---
        Assert.Equal(0x00001001u,              d.WeenieClassId);
        Assert.Equal(0x06001111u,              d.IconId);
        Assert.Equal(0x06002222u,              d.IconOverlayId);
        Assert.Equal(0x06003333u,              d.IconUnderlayId);
        Assert.Equal(0x00000004u,              d.Effects);

        // --- quantity / economy ---
        Assert.Equal(7,                        d.Value);
        Assert.Equal(1,                        d.StackSize);
        Assert.Equal(1,                        d.StackSizeMax);
        Assert.Equal(300,                      d.Burden);

        // --- container / wielder ---
        Assert.Equal(0x000000C9u,              d.ContainerId);
        Assert.Equal(0x000000DAu,              d.WielderId);

        // --- equip masks ---
        Assert.Equal(0x00000012u,              d.ValidLocations);
        Assert.Equal(0x00000002u,              d.CurrentWieldedLocation);
        Assert.Equal(0x00000005u,              d.Priority);

        // --- capacity ---
        Assert.Equal(0,                        d.ItemsCapacity);
        Assert.Equal(0,                        d.ContainersCapacity);

        // --- durability ---
        Assert.Equal(80,                       d.Structure);
        Assert.Equal(100,                      d.MaxStructure);
        Assert.Equal(4.5f,                     d.Workmanship);
    }

    // -------------------------------------------------------------------------
    // The handler that ObjectTableWiring.Wire subscribes to session.EntityDeleted.
    // Testing it directly avoids needing a live WorldSession (UDP socket).
    // -------------------------------------------------------------------------
    private static Action<DeleteObject.Parsed> MakeEntityDeletedHandler(ClientObjectTable table)
        => d => { if (!d.FromPickup) table.Remove(d.Guid); };

    private static WeenieData MinimalWeenie(uint guid) => new(
        Guid: guid,
        Name: "Test Item",
        Type: null,
        WeenieClassId: 1u,
        IconId: 0x06000001u,
        IconOverlayId: 0u,
        IconUnderlayId: 0u,
        Effects: 0u,
        Value: null,
        StackSize: null,
        StackSizeMax: null,
        Burden: null,
        ContainerId: null,
        WielderId: null,
        ValidLocations: null,
        CurrentWieldedLocation: null,
        Priority: null,
        ItemsCapacity: null,
        ContainersCapacity: null,
        Structure: null,
        MaxStructure: null,
        Workmanship: null);

    /// <summary>
    /// PickupEvent path: FromPickup = true → weenie is RETAINED in ClientObjectTable.
    /// The 3-D render entity is removed (EntityDeleted still fires), but the weenie
    /// data persists so the follow-up InventoryPutObjInContainer can find it.
    /// </summary>
    [Fact]
    public void EntityDeleted_FromPickupTrue_RetainsWeenieInTable()
    {
        var table = new ClientObjectTable();
        var handler = MakeEntityDeletedHandler(table);

        const uint guid = 0x80000100u;
        table.Ingest(MinimalWeenie(guid));
        Assert.NotNull(table.Get(guid));   // pre-condition: item is in the table

        // Fire EntityDeleted as WorldSession does for PickupEvent (0xF74A).
        // The handler itself represents the EntityDeleted subscription — firing it IS the event.
        handler(new DeleteObject.Parsed(guid, 0, FromPickup: true));

        // Post-condition: weenie still in table (it moved into a container, was NOT destroyed).
        // EntityDeleted still fires (the handler ran), so the 3-D render layer would remove the WorldEntity.
        Assert.NotNull(table.Get(guid));
    }

    /// <summary>
    /// DeleteObject path: FromPickup = false → weenie IS evicted from ClientObjectTable.
    /// Regression guard — true destroys (0xF747) must still clean up the table.
    /// </summary>
    [Fact]
    public void EntityDeleted_FromPickupFalse_EvictsWeenieFromTable()
    {
        var table = new ClientObjectTable();
        var handler = MakeEntityDeletedHandler(table);

        const uint guid = 0x80000200u;
        table.Ingest(MinimalWeenie(guid));
        Assert.NotNull(table.Get(guid));   // pre-condition: item is in the table

        // Fire EntityDeleted as WorldSession does for DeleteObject (0xF747).
        handler(new DeleteObject.Parsed(guid, 0, FromPickup: false));

        // Post-condition: weenie evicted (truly destroyed).
        Assert.Null(table.Get(guid));
    }
}