using System.Collections.Generic;
using AcDream.App.Rendering.Wb;
using Xunit;

namespace AcDream.App.Tests.Rendering.Wb;

public sealed class WbDrawDispatcherClipSlotTests
{
    private const uint VisibleCellA = 0xA9B4_0164u;
    private const uint VisibleCellB = 0xA9B4_0165u;
    private const uint NotVisibleCell = 0xA9B4_0999u;
    private const uint OutdoorCell = 0xA9B4_0020u;

    private const int SlotA = 3;
    private const int SlotB = 7;
    private const int OutsideViewSlot = 11;

    private static IReadOnlyDictionary<uint, int> Routing() => new Dictionary<uint, int>
    {
        [VisibleCellA] = SlotA,
        [VisibleCellB] = SlotB,
    };

    [Fact]
    public void RawResolve_LiveEntity_WithVisibleIndoorParent_GetsThatCellSlot()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0x5000_000Au, parentCellId: VisibleCellA,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(SlotA, slot);
    }

    [Fact]
    public void RawResolve_LiveEntity_WithHiddenIndoorParent_IsCulled()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0x5000_000Au, parentCellId: NotVisibleCell,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(WbDrawDispatcher.ClipSlotCull, slot);
    }

    [Fact]
    public void RawResolve_LiveEntity_WithOutdoorParent_UsesOutsideViewWhenVisible()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0x5000_000Au, parentCellId: OutdoorCell,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(OutsideViewSlot, slot);
    }

    [Fact]
    public void RawResolve_LiveEntity_WithParentNull_IsCulledWhenRoutingActive()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0x5000_000Au, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(WbDrawDispatcher.ClipSlotCull, slot);
    }

    [Fact]
    public void RawResolve_CellStatic_InVisibleSet_GetsThatCellSlot()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0u, parentCellId: VisibleCellB,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(SlotB, slot);
    }

    [Fact]
    public void RawResolve_CellStatic_NotInVisibleSet_IsCulled()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0u, parentCellId: NotVisibleCell,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(WbDrawDispatcher.ClipSlotCull, slot);
    }

    [Fact]
    public void RawResolve_OutdoorStab_OutdoorsVisible_GetsOutsideViewSlot()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0u, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal(OutsideViewSlot, slot);
    }

    [Fact]
    public void RawResolve_OutdoorStab_OutdoorsNotVisible_IsCulled()
    {
        int slot = WbDrawDispatcher.ResolveEntitySlot(
            serverGuid: 0u, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: false);

        Assert.Equal(WbDrawDispatcher.ClipSlotCull, slot);
    }

    [Fact]
    public void ForFrame_RoutingInactive_EveryEntityIsSlot0AndNotCulled()
    {
        var live = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: false, serverGuid: 0x5000_000Au, parentCellId: null,
            cellIdToSlot: null, outdoorSlot: OutsideViewSlot, outdoorVisible: true);
        Assert.Equal(0u, live.Slot);
        Assert.False(live.Culled);

        var wouldCull = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: false, serverGuid: 0u, parentCellId: NotVisibleCell,
            cellIdToSlot: null, outdoorSlot: OutsideViewSlot, outdoorVisible: false);
        Assert.Equal(0u, wouldCull.Slot);
        Assert.False(wouldCull.Culled);
    }

    [Fact]
    public void ForFrame_RoutingActive_LiveEntityVisible_GetsCellSlotNotCulled()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0x5000_000Au, parentCellId: VisibleCellA,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal((uint)SlotA, r.Slot);
        Assert.False(r.Culled);
    }

    [Fact]
    public void ForFrame_RoutingActive_LiveEntityParentNull_Culled()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0x5000_000Au, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.True(r.Culled);
        Assert.Equal(0u, r.Slot);
    }

    [Fact]
    public void ForFrame_RoutingActive_CellStaticVisible_GetsCellSlotNotCulled()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0u, parentCellId: VisibleCellA,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal((uint)SlotA, r.Slot);
        Assert.False(r.Culled);
    }

    [Fact]
    public void ForFrame_RoutingActive_CellStaticNotVisible_Culled()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0u, parentCellId: NotVisibleCell,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.True(r.Culled);
        Assert.Equal(0u, r.Slot);
    }

    [Fact]
    public void ForFrame_RoutingActive_OutdoorStabVisible_GetsOutsideViewSlot()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0u, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: true);

        Assert.Equal((uint)OutsideViewSlot, r.Slot);
        Assert.False(r.Culled);
    }

    [Fact]
    public void ForFrame_RoutingActive_OutdoorStabNotVisible_Culled()
    {
        var r = WbDrawDispatcher.ResolveSlotForFrame(
            clipRoutingActive: true, serverGuid: 0u, parentCellId: null,
            cellIdToSlot: Routing(), outdoorSlot: OutsideViewSlot, outdoorVisible: false);

        Assert.True(r.Culled);
        Assert.Equal(0u, r.Slot);
    }
}