static property_channel
Property_InitFloat(real32 Val, real32 ScrubVal, real32 MinVal = PROPERTY_REAL_MIN, real32 MaxVal = PROPERTY_REAL_MAX, bool32 AlwaysInteger = 0);

static block_layer *
Layer_Init(project_data *File, memory *Memory)
{
    if (File->Layer_Count + 1 > MAX_LAYERS) {
        Assert(0);
    }
    block_layer *Layer = (block_layer *)Memory_Block_AllocateAddress(Memory, F_Layers);
    History_Action_Block_Swap(Memory, F_Layers, Layer);

    *Layer = {};
    Layer->Occupied = 1;

    Layer->Block_String_Index = Memory_Block_AllocateNew(Memory, F_Strings);
    block_string *String = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, Layer->Block_String_Index, 0);
    sprintf(String->Char, "Layer %i", File->Layer_Count + 1);  // CSbros...
    History_Action_Swap(Memory, F_File, sizeof(String->Occupied), &String->Occupied);
    String->Occupied = 1;

    Layer->x =        Property_InitFloat(0.0f, 1.0f);
    Layer->y =        Property_InitFloat(0.0f, 1.0f);
    Layer->ax =       Property_InitFloat(0.5f, 0.005f);
    Layer->ay =       Property_InitFloat(0.5f, 0.005f);
    Layer->scale =    Property_InitFloat(1.0f, 0.005f);
    Layer->rotation = Property_InitFloat(0.0f, 1.0f);
    Layer->opacity =  Property_InitFloat(1.0f, 0.005f, 0.0f, 1.0f);
    Layer->time =     Property_InitFloat(0.0f, 1.0f, 0, 100000, 1);

    Layer->IsVisible = 1;

    History_Action_Swap(Memory, F_File, sizeof(File->Layer_Count), &File->Layer_Count);
    File->Layer_Count++;

    return Layer;
}

// lots of cleanup...
static void
Layer_Delete(project_data *File, project_state *State, memory *Memory, uint32 Index)
{
    block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index);
    History_Action_Block_Swap(Memory, F_Layers, Layer);
    Layer->Occupied = 0;

    block_string *String = (block_string *)Memory_Block_AddressAtIndex(Memory, F_Strings, Layer->Block_String_Index, 0);
    History_Action_Block_Swap(Memory, F_Strings, String);
    String->Occupied = 0;

    for (int i = 0; i < Layer->Block_Effect_Count; i++) {
        block_effect *Effect = (block_effect *)Memory_Block_AddressAtIndex(Memory, F_Effects, Layer->Block_Effect_Index[i]);
        header_effect *EffectHeader = Effect_EntryFromID(State, Effect->ID);
        for (int h = 0; h < EffectHeader->Property_Count; h++) {
            header_property ChannelHeader = State->Property[EffectHeader->PropertyStartIndex + h];
            property_channel *Property = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[h]);
            if (Property->Block_Bezier_Count) {
                block_bezier *Bezier = (block_bezier *)Memory_Block_AddressAtIndex(Memory, F_Bezier, Property->Block_Bezier_Index[i], 0);
                History_Action_Block_Swap(Memory, F_Bezier, Bezier);
                Bezier->Occupied = 0;
            }
            History_Action_Block_Swap(Memory, F_Properties, Property);
            Property->Occupied = 0;
        }
        History_Action_Block_Swap(Memory, F_Effects, Effect);
        Effect->Occupied = 0;
    }
    History_Action_Swap(Memory, F_File, sizeof(File->Layer_Count), &File->Layer_Count);
    File->Layer_Count--;
}

static layer_transforms
Layer_GetTransforms(block_layer *Layer) {
    return { Layer->x.CurrentValue, Layer->y.CurrentValue, Layer->ax.CurrentValue, Layer->ay.CurrentValue, Layer->rotation.CurrentValue, Layer->scale.CurrentValue };
}

static int
Layer_GetTopOffset(project_data *File, memory *Memory)
{
    if (File->Layer_Count == 0)
        return 11;
    int TopOffset = 9999;
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (Layer->Block_Composition_Index == File->PrincipalCompIndex) {
            TopOffset = (Layer->Vertical_Offset < TopOffset) ? Layer->Vertical_Offset : TopOffset;
        }
    }
    return TopOffset;
}


static void
Layer_UpdateMasksEffects(project_state *State, block_layer *Layer, memory *Memory, void *EffectBitmapAddress,
        int Width, int Height, int BytesPerPixel)
{
    uint64 Size = Width*Height*BytesPerPixel;

    // We need two of these: one with multisampling enabled and a
    // non-multisampled one that we can blit to.
    gl_effect_layer TestL = {};
    gl_effect_layer TestM = {};

    GL_UpdateTexture(&TestL, EffectBitmapAddress, Width, Height, BytesPerPixel, 0);
    GL_UpdateTexture(&TestM, EffectBitmapAddress, Width, Height, BytesPerPixel, 1);

    for (int i = 0; i < Layer->Block_Effect_Count; i++)
    {
        block_effect Effect = *(block_effect *)Memory_Block_AddressAtIndex(Memory, F_Effects, Layer->Block_Effect_Index[i]);
        header_effect *EffectEntry = Effect_EntryFromID(State, Effect.ID);

        if (Effect.IsToggled) {
            uint64 Size = (sizeof(real32) * MAX_PROPERTIES_PER_EFFECT) + (sizeof(real32) * 10);
            real32 *Data;
            if (EffectEntry->DisplayType == effect_display_type_curves) {
                Data = (real32 *)Memory_PushScratch(Memory, Size);
                uint16 SortedPointIndex[MAX_PROPERTIES_PER_EFFECT];
                v2 *SortedPointValues = (v2 *)(Data + 5);
                for (int c = 0; c < 5; c++) {
                    *(Data + c) = Effect.ExtraData[c];
                    uint32 Shift = MAX_PROPERTIES_PER_EFFECT / 5 * c;
                    uint16 *SortedPointIndexPlayhead = SortedPointIndex + Shift;
                    v2 *SortedPointValuesPlayhead = SortedPointValues + Shift;
                    Effect_Curves_Sort(Memory, &Effect, SortedPointIndexPlayhead, c);
                    for (int a = 0; a < Effect.ExtraData[c]; a++) {
                        *SortedPointValuesPlayhead = Effect_V2(Memory, &Effect, SortedPointIndexPlayhead[a]);
                        SortedPointValuesPlayhead++;
                    }
                }
            } else {
                Data = (real32 *)Memory_PushScratch(Memory, Size);
                for (int c = 0; c < EffectEntry->Property_Count; c++) {
                    property_channel *Property = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect.Block_Property_Index[c]);
                    Data[c] = Property->CurrentValue;
                }
            }
            EffectEntry->func(Data, Width, Height, BytesPerPixel, EffectBitmapAddress, EffectEntry->GLShaderIndex);
            Memory_PopScratch(Memory, Size);
        }
    }
    /*
    if (Layer->NumberOfMasks) {
        for (int i = 0; i < Layer->NumberOfMasks; i++) {
            file_mask_header *MaskHeader = (file_mask_header *)((uint8 *)Layer + sizeof(file_layer) + MaskOffset);
            if (MaskHeader->IsClosed && MaskHeader->IsToggled) {
                mask_point *Point = (mask_point *)((uint8 *)MaskHeader + sizeof(file_mask_header));
                Mask_TriangulateAndRasterize(TestM, TestL, Memory, MaskHeader, Point, Source->Width, Source->Height, Source->BytesPerPixel, EffectBitmapAddress);
            }
        }
        Bitmap_StencilAlpha(SourceBitmapAddress, EffectBitmapAddress, Source->BytesPerPixel, Size);
    }

    Layer->OutputBitmapLocation = EffectBitmapAddress;
    */

    GL_DeleteHWBuffer(&TestL);
    GL_DeleteHWBuffer(&TestM);
}

static void
Layer_ToggleChannel(project_data *File, memory *Memory, int32 a)
{
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i))
    {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        if (Layer->IsSelected)
            Layer->Property[a].IsToggled ^= 1;
    }
}

static void
Layer_Select(memory *Memory, project_state *State, int32 i)
{
    block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
    Layer->IsSelected = true;
    State->MostRecentlySelectedLayer = i;
    State->RecentSelectionType = selection_type_layer;
}

static void
Layer_Select_RecurseUp(memory *Memory, project_state *State, int32 i, int16 RecursionIdx[MAX_PRECOMP_RECURSIONS], uint32 Recursions)
{
    for (int a = 1; a <= Recursions; a++) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, RecursionIdx[a]);
        Layer->IsSelected = 2;
    }
}

static void
Layer_DeselectAll(project_data *File, project_state *State, memory *Memory) {
    int h = 0, c = 0, i = 0;
    while (Block_Loop(Memory, F_Layers, File->Layer_Count, &h, &c, &i)) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, i);
        Layer->IsSelected = false;
    }
    State->MostRecentlySelectedLayer = -1;
}

// h: index of the total amount of properties and effects
// c: index of the amount of properties in a given effect
// p: prior property's keyframe count, so we can increment the sorted keyframe array properly
static bool32
Layer_LoopChannels(project_state *State, memory *Memory, sorted_property_array **SortedProperty, uint16 **SortedKeyframe, block_layer *Layer,
                   property_channel **Property, block_effect **EffectOut, int *h, int *c, int *p)
{
    uint32 Amount = AmountOf(Layer->Property) + Layer->Block_Effect_Count;
    // Assert(Layer->Block_Effect_Count < 2);
    while (*h < Amount) {
        if (*h < AmountOf(Layer->Property) && *c == 0) {
            *Property = &Layer->Property[*h];
            if (*h != 0) {
                *SortedProperty += 1;
                *SortedKeyframe += *p;
            }
            *h += 1;
            *p = (**Property).Keyframe_Count;
            return 1;
        } else {
            uint16 EffectIdx = Layer->Block_Effect_Index[*h - AmountOf(Layer->Property)];
            block_effect *Effect = (block_effect *)Memory_Block_AddressAtIndex(Memory, F_Effects, EffectIdx);
            if (EffectOut)
                *EffectOut = Effect;
            header_effect *EffectHeader = Effect_EntryFromID(State, Effect->ID);
            while (*c < EffectHeader->Property_Count) {
                // header_property ChannelHeader = State->Property[EffectHeader->PropertyStartIndex + c];
                *Property = (property_channel *)Memory_Block_AddressAtIndex(Memory, F_Properties, Effect->Block_Property_Index[*c]);
                *SortedProperty += 1;
                *SortedKeyframe += *p;
                *p = (**Property).Keyframe_Count;
                *c += 1;
                return 1;
            }
            *h += 1;
            *c = 0;
        }
    }
    Assert(*h != (Amount - 1));
    return 0;
}

static void
Layer_ToggleAllChannels(project_state *State, memory *Memory, block_layer *Layer,
                        sorted_comp_array *SortedCompStart, sorted_layer_array *SortedLayerStart,
                        sorted_property_array *SortedPropertyStart, uint16 *SortedKeyframeArray)
{
    bool32 ToggleMode = 1;
    {
        sorted_property_array *InfoLocation = SortedPropertyStart + SortedLayerStart->SortedPropertyStart;
        uint16 *ArrayLocation = SortedKeyframeArray + SortedLayerStart->SortedKeyframeStart;
        int h = 0, c = 0, p = 0;
        property_channel *Property = NULL;
        block_effect *Effect = NULL;
        while (Layer_LoopChannels(State, Memory, &InfoLocation, &ArrayLocation, Layer, &Property, &Effect, &h, &c, &p))
        {
            if (Property->IsToggled) {
                ToggleMode = 0;
                break;
            }
        }
    }
    sorted_property_array *InfoLocation = SortedPropertyStart + SortedLayerStart->SortedPropertyStart;
    uint16 *ArrayLocation = SortedKeyframeArray + SortedLayerStart->SortedKeyframeStart;
    int h = 0, c = 0, p = 0;
    property_channel *Property = NULL;
    block_effect *Effect = NULL;
    while (Layer_LoopChannels(State, Memory, &InfoLocation, &ArrayLocation, Layer, &Property, &Effect, &h, &c, &p))
    {
        if (Property->Keyframe_Count) {
            Property->IsToggled = ToggleMode;
        }
    }
}

static void
Layer_Select_Traverse(uint16 PrincipalCompIndex, memory *Memory, project_state *State, int32 IndexToFind, sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray,
                      int16 RecursionIdx[MAX_PRECOMP_RECURSIONS], int32 *Recursions)
{
    uint16 CompIndex = 0;
    if (RecursionIdx[*Recursions] == -1) {
        CompIndex = PrincipalCompIndex;
    } else {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, RecursionIdx[*Recursions]);
        CompIndex = Layer->Block_Source_Index;
    }
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, CompIndex);
    sorted_comp_array SortedCompStart = SortedCompArray[CompIndex];
    uint32 RecursionsCurrent = *Recursions;
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--)
    {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        if (Layer->IsPrecomp && Layer->IsSelected == 2) {
            *Recursions = RecursionsCurrent + 1;
            RecursionIdx[*Recursions] = Index_Physical;
            Layer_Select_Traverse(PrincipalCompIndex, Memory, State, IndexToFind, SortedCompArray, SortedLayerArray, RecursionIdx, Recursions);
        } else if (Index_Physical == IndexToFind) {
            return;
        }
    }
}

static v2
Layer_TraverseForPoint(project_data *File, project_state *State, memory *Memory, v2 PrincipalCompUV, sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray)
{
    int16 RecursionIdx[MAX_PRECOMP_RECURSIONS] = {};
    RecursionIdx[0] = -1;
    int32 Recursions = 0;
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, File->PrincipalCompIndex);
    sorted_comp_array SortedCompStart = SortedCompArray[File->PrincipalCompIndex];
    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, File->PrincipalCompIndex);
    Layer_Select_Traverse(File->PrincipalCompIndex, Memory, State, State->Brush.LayerToPaint_Index, SortedCompArray, SortedLayerArray, RecursionIdx, &Recursions);
    v2 PointUV = {0, 0};
    int OuterWidth = Comp->Width, OuterHeight = Comp->Height;
    int InnerWidth = 0, InnerHeight = 0;
    if (Recursions == 0) {
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, State->Brush.LayerToPaint_Index);
        layer_transforms T = Layer_GetTransforms(Layer);
        Layer_GetDimensions(Memory, Layer, &InnerWidth, &InnerHeight);
        PointUV = T_CompUVToLayerUV(T, OuterWidth, OuterHeight, InnerWidth, InnerHeight, PrincipalCompUV);
    } else {
        for (int i = 1; i <= Recursions; i++) {
            block_layer *InnerLayer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, RecursionIdx[i]);
            layer_transforms T = Layer_GetTransforms(InnerLayer);
            Layer_GetDimensions(Memory, InnerLayer, &InnerWidth, &InnerHeight);
            PointUV = T_CompUVToLayerUV(T, OuterWidth, OuterHeight, InnerWidth, InnerHeight, PrincipalCompUV);
            OuterWidth = InnerWidth;
            OuterHeight = InnerHeight;
        }
    }
    return PointUV * V2(InnerWidth, InnerHeight);
}

static int32
Layer_TestSelection(memory *Memory, project_state *State, ui *UI, sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray, uint16 PrincipalIndex)
{
    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, PrincipalIndex);
    sorted_comp_array SortedCompStart = SortedCompArray[PrincipalIndex];
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, PrincipalIndex);
    int SelectionCount = 0;
    int SelectedLayerIndex = 0;
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--) {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Layer->Block_Source_Index);
        layer_transforms T = Layer_GetTransforms(Layer);
        v2 UV = T_CompUVToLayerUV(T, Comp->Width, Comp->Height, Source->Width, Source->Height, State->TempZoomRatio);
        if (UV.x <= 1.0f && UV.x >= 0.0f && UV.y <= 1.0f && UV.y >= 0.0f && Layer->IsSelected)
        {
            SelectionCount++;
            SelectedLayerIndex = i;
        }
    }
    int32 LayerIndex = -1;
    for (int i = SortedCompStart.LayerCount - 1; i >= 0; i--) {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        block_source *Source = (block_source *)Memory_Block_AddressAtIndex(Memory, F_Sources, Layer->Block_Source_Index);
        layer_transforms T = Layer_GetTransforms(Layer);
        v2 UV = T_CompUVToLayerUV(T, Comp->Width, Comp->Height, Source->Width, Source->Height, State->TempZoomRatio);
        if (UV.x <= 1.0f && UV.x >= 0.0f && UV.y <= 1.0f && UV.y >= 0.0f && !Layer->IsSelected)
        {
            if (SelectionCount == 1) {
                if (i < SelectedLayerIndex) {
                    LayerIndex = Index_Physical;
                    break;
                }
            } else {
                LayerIndex = Index_Physical;
                break;
            }
        }
        // if (Layer->IsPrecomp) {
        //     Layer_RecursiveDeselect(Memory, SortedCompArray, SortedLayerArray, TargetIndex, Layer->Block_Source_Index);
        // }
        // if (Layer->Block_Composition_Index != TargetIndex) {
        //     Layer->IsSelected = false;
        // }
    }
    return LayerIndex;
}

static void
Layer_RecursiveDeselect(memory *Memory, sorted_comp_array *SortedCompArray, sorted_layer_array *SortedLayerArray, uint16 TargetIndex, uint16 PrincipalIndex)
{
    block_composition *Comp = (block_composition *)Memory_Block_AddressAtIndex(Memory, F_Precomps, PrincipalIndex);
    sorted_comp_array SortedCompStart = SortedCompArray[PrincipalIndex];
    sorted_layer_array *SortedLayerStart = Sorted_GetLayerStart(SortedLayerArray, SortedCompArray, PrincipalIndex);
    for (int i = 0; i < SortedCompStart.LayerCount; i++) {
        sorted_layer_array SortEntry = SortedLayerStart[i];
        uint32 Index_Physical = SortEntry.Block_Layer_Index;
        block_layer *Layer = (block_layer *)Memory_Block_AddressAtIndex(Memory, F_Layers, Index_Physical);
        if (Layer->IsPrecomp) {
            Layer_RecursiveDeselect(Memory, SortedCompArray, SortedLayerArray, TargetIndex, Layer->Block_Source_Index);
        }
        if (Layer->Block_Composition_Index != TargetIndex) {
            Layer->IsSelected = false;
        }
    }
}