internal void
IncrementFrame(project_data *File, int16 Amount) {
    if ((File->CurrentFrame <= 0 && Amount < File->StartFrame) || (File->CurrentFrame >= File->EndFrame)) {
        File->CurrentFrame = 0;
    } else {
        File->CurrentFrame += Amount;
    }
}

internal void
CalculateFull(pixel_buffer *Buffer) {
    uint16 ExtraWidth = 4 - (Buffer->Width % 4);
    if (ExtraWidth == 4)
        ExtraWidth = 0;
    uint16 ExtraHeight = 4 - (Buffer->Height % 4);
    if (ExtraHeight == 4)
        ExtraHeight = 0;
    Buffer->FullWidth = Buffer->Width + ExtraWidth;
    Buffer->FullHeight = Buffer->Height + ExtraHeight;
}

internal pixel_buffer
CreateBuffer(int Width, int Height, memory *Memory)
{
    pixel_buffer Buffer = {};
    Buffer.BytesPerPixel = 4;
    Buffer.Width = Width;
    Buffer.Height = Height;
    CalculateFull(&Buffer);
    Buffer.Pitch = Buffer.FullWidth*Buffer.BytesPerPixel;
    Buffer.OriginalBuffer = AllocateMemory(Memory, Buffer.FullWidth * Buffer.FullHeight * Buffer.BytesPerPixel, B_Scratch);
    Buffer.EffectBuffer = AllocateMemory(Memory, Buffer.FullWidth * Buffer.FullHeight * Buffer.BytesPerPixel, B_Scratch);
    Buffer.ToUpdate = true;
    return Buffer;
}

internal void
AddSource(project_data *File, memory *Memory, char *Path)
{
    int16 a = File->NumberOfSources++;
    Assert(a < MAX_SOURCES);
    if (Path == NULL) {
        File->Source[a] = (char *)AllocateMemory(Memory, STRING_SIZE, F_Strings);
    } else {
        File->Source[a] = Path;
    }
}

internal pixel_buffer
LoadImage(memory *Memory, char *filename)
{
    pixel_buffer Buffer = {};
    Buffer.BytesPerPixel = 4;

    int n = 0;
    int h, w;
    void *temp = stbi_load(filename, &w, &h, &n, 4);
    // printf("%s", stbi_failure_reason());
    Buffer.Height = h;
    Buffer.Width = w;
    CalculateFull(&Buffer);
    Buffer.Pitch = Buffer.FullWidth*Buffer.BytesPerPixel;
    // TODO(fox): Implement custom malloc in stbi so we don't have to do this.
    Buffer.OriginalBuffer = MoveImportToBitmap(Memory, &Buffer, temp);
    stbi_image_free(temp);
    Buffer.EffectBuffer = AllocateMemory(Memory, Buffer.FullWidth * Buffer.FullHeight * Buffer.BytesPerPixel, B_Scratch);
    BitmapPackRGB(&Buffer);
    Buffer.ToUpdate = true;
    return Buffer;
}

internal pixel_buffer
CreateSolidBitmap(memory *Memory, uint16 Height, uint16 Width, v4 Color) {
    pixel_buffer Buffer = {};
    Buffer.BytesPerPixel = 4;
    Buffer.Height = Height;
    Buffer.Width = Width;
    CalculateFull(&Buffer);
    Buffer.Pitch = Buffer.FullWidth*Buffer.BytesPerPixel;
    Buffer.OriginalBuffer = AllocateMemory(Memory, Buffer.FullHeight * Buffer.FullWidth * Buffer.BytesPerPixel, B_Scratch);
    Buffer.EffectBuffer = AllocateMemory(Memory,   Buffer.FullHeight * Buffer.FullWidth * Buffer.BytesPerPixel, B_Scratch);
    DebugFillSolid(&Buffer, Color);
    BitmapPackRGB(&Buffer);
    Buffer.ToUpdate = true;
    return Buffer;
}

internal pixel_buffer
CreateDebugBitmap(memory *Memory, uint16 Height, uint16 Width) {
    pixel_buffer Buffer = {};
    Buffer.BytesPerPixel = 4;
    Buffer.Height = Height;
    Buffer.Width = Width;
    CalculateFull(&Buffer);
    Buffer.Pitch = Buffer.FullWidth*Buffer.BytesPerPixel;
    Buffer.OriginalBuffer = AllocateMemory(Memory, Buffer.FullHeight * Buffer.FullWidth * Buffer.BytesPerPixel, B_Scratch);
    Buffer.EffectBuffer = AllocateMemory(Memory,   Buffer.FullHeight * Buffer.FullWidth * Buffer.BytesPerPixel, B_Scratch);
    DebugBitmap(&Buffer);
    BitmapPackRGB(&Buffer);
    Buffer.ToUpdate = true;
    return Buffer;
}


internal void
DrawHistogram(project_layer *Layer, pixel_buffer *UIBuffer, void *Scratch, memory *Memory, sdl_input Input, project_state *State,
              rectangle Box)
{
    uint16 Padding = 20; //UI->LayerPadding / 5;
    uint16 Margin = 100;

    uint16 *Levels = (uint16 *)Scratch;

    uint16 *Mean = (Levels + 256*7);

    uint32 Color = 0;
    uint32 AltColor = ColToUint32(V4(0.1,0.1,0.1,1.0));

    // this is a bad idea
    real32 *Zoom = (real32 *)(Levels + 256*6);
    if (*Zoom < 0.0f)
        *Zoom = 0.0f;
    uint16 *SelectedChannel = (uint16 *)(Levels + 256*6 + 3);

    if (*SelectedChannel == 0) {
        Color = ColToUint32(V4(0.6,0.6,0.6,1.0));
    } else if (*SelectedChannel == 1) {
        Levels += 256;
        Color = ColToUint32(V4(0.6,0.0,0.0,1.0));
    } else if (*SelectedChannel == 2) {
        Levels += 256*2;
        Color = ColToUint32(V4(0.0,0.6,0.0,1.0));
    } else if (*SelectedChannel == 3) {
        Levels += 256*3;
        Color = ColToUint32(V4(0.0,0.0,0.6,1.0));
    } else if (*SelectedChannel == 4) {
        Levels += 256*4;
        Color = ColToUint32(V4(0.9,0.9,0.9,1.0));
    }


    /*
    if (TestRectangle(Box, Input.Mouse) &&
        Input.MouseButton[0].IsDown)
    {
        State->ArbitrarySlide = 1;
        State->Sliding.RandomPointer = Zoom;
    }
    */

    uint8 *Row = ((uint8 *)UIBuffer->OriginalBuffer +
                     UIBuffer->BytesPerPixel +
                     UIBuffer->Pitch);
    for (int Y = 0;
        Y > Box.Min.y;
        Y--)
    {
        uint32 *Pixel = (uint32 *)Row + Box.Min.x;
        for(int X = Box.Min.x;
            X < Box.Max.x;
            ++X)
        {
            real32 Span = (Box.Max.x - Box.Min.x) / 256.0f;
            int16 XLocal = (X - Box.Min.x) / Span;
            int16 YLocal = -(Y - Box.Max.y);
            if (*(Levels + XLocal) > (YLocal * RoundReal32ToInt32(*Zoom)) && XLocal < 256)
                *Pixel++ = Color;
            else
                *Pixel++ = AltColor;
        }
        Row -= UIBuffer->Pitch;
    }
}

internal property_channel
InitFloatProperty(char *Name, real32 Val, real32 ScrubVal, real32 MinVal = PROPERTY_REAL_MIN, real32 MaxVal = PROPERTY_REAL_MAX) {
    property_channel Property = {};
    Property.Name = Name;
    Property.CurrentValue.f = Val;
    Property.MinVal.f = MinVal;
    Property.MaxVal.f = MaxVal;
    Property.ScrubVal.f = ScrubVal;
    Property.VarType = type_real;
    Property.GraphWindowHeight = 300;
    return Property;
}

internal bool32
IsSupportedFile(source_type *Type, char *filename) {
    bool32 Result = 0;
    if (stbi_info(filename, NULL, NULL, NULL)) {
        *Type = source_image;
        Result = 1;
    } else if (TestAV(filename)) {
        *Type = source_video;
        Result = 1;
    }
    return Result;
}

internal void
CreateRenderInfo(project_layer *Layer, memory *Memory, project_data File, source_type Type, char *filename)
{
    if (Type == source_image) {
        Layer->RenderInfo = AllocateMemory(Memory, sizeof(image_source), P_SourceData);
        image_source *Source = (image_source *)Layer->RenderInfo;
        Source->Raster = LoadImage(Memory, filename);
        Layer->SourceType = source_image;

        Layer->x.CurrentValue.f = 1280/2;
        Layer->y.CurrentValue.f = 720/2;
        Layer->StartFrame = 0;
        Layer->EndFrame = File.EndFrame;
    }
    else if (Type == source_video) {
        Layer->RenderInfo = AllocateMemory(Memory, sizeof(video_source), P_SourceData);
        video_source *Source = (video_source *)Layer->RenderInfo;
        InitAV(filename, &Source->AV);

        Layer->SourceType = source_video;
        Source->VideoCurrentFrame = -1;

        int32 Width = Source->AV.VideoCodecContext->width;
        int32 Height = Source->AV.VideoCodecContext->height;
        Source->Raster = CreateBuffer(Width, Height, Memory);

        Layer->x.CurrentValue.f = 1280/2;
        Layer->y.CurrentValue.f = 720/2;
        Layer->StartFrame = 0;
        Layer->EndFrame = File.EndFrame;
    } else {
        Assert(0);
    }
}


internal void
CreateKeyframeBlock(property_channel *Property, memory *Memory)
{
    int16 a = Property->NumberOfKeyframeBlocks++;
    Assert(a < MAX_KEYFRAME_BLOCKS);

    Property->KeyframeBlock[a] = (keyframe_block *)AllocateMemory(Memory, sizeof(keyframe_block), F_Keyframes);
}

internal project_layer *
CreateLayer(project_data *File, memory *Memory)
{
    int16 a = File->NumberOfLayers++;
    Assert(a < MAX_LAYERS);

    File->Layer[a] = (project_layer *)AllocateMemory(Memory, sizeof(project_layer), F_Layers);

    File->Layer[a]->Name = (char *)AllocateMemory(Memory, 256, F_Strings);
    sprintf(File->Layer[a]->Name, "Layer %i", a);
    File->Layer[a]->x = InitFloatProperty("X Position", 0.0f, 1.0f);
    File->Layer[a]->y = InitFloatProperty("Y Position", 0.0f, 1.0f);
    File->Layer[a]->ax = InitFloatProperty("Anchor X", 0.5f, 0.005f);
    File->Layer[a]->ay = InitFloatProperty("Anchor Y", 0.5f, 0.005f);
    File->Layer[a]->scale = InitFloatProperty("Scale", 1.0f, 0.005f);
    File->Layer[a]->rotation = InitFloatProperty("Rotation", 0.0f, 1.0f);
    File->Layer[a]->opacity = InitFloatProperty("Opacity", 1.0f, 0.005f, 0.0f, 1.0f);
    File->Layer[a]->time = InitFloatProperty("Frame Number", 0.0f, 1.0f, 0, 100000);
    File->Layer[a]->EndFrame = File->NumberOfFrames;

    return File->Layer[a];
}

internal void
PostMsg(project_state *State, char *msg)
{
    State->MsgTime = 120;
    State->Msg = msg;
}

internal void
CreateLayerFromSource(project_data *File, project_state *State, memory *Memory, char *filename)
{
    source_type Type = source_none;
    if (IsSupportedFile(&Type, filename)) {
        project_layer *Layer = CreateLayer(File, Memory);
        CreateRenderInfo(Layer, Memory, *File, Type, filename);
        State->UpdateFrame = true;
        State->DemoButton = true;
    } else {
        PostMsg(State, "File open fail...");
    }
}


internal project_layer *
CreateSolidLayer(project_data *File, memory *Memory, uint16 Width, uint16 Height, v4 Col)
{
    project_layer *Layer = CreateLayer(File, Memory);
    Layer->RenderInfo = AllocateMemory(Memory, sizeof(image_source), P_SourceData);
    image_source *Source = (image_source *)Layer->RenderInfo;
    Source->Raster = CreateSolidBitmap(Memory, Width, Height, Col);
    Layer->SourceType = source_image;
    return Layer;
}

internal project_layer *
CreateDebugLayer(project_data *File, memory *Memory, uint16 Width, uint16 Height)
{
    project_layer *Layer = CreateLayer(File, Memory);
    Layer->RenderInfo = AllocateMemory(Memory, sizeof(image_source), P_SourceData);
    image_source *Source = (image_source *)Layer->RenderInfo;
    Source->Raster = CreateDebugBitmap(Memory, Width, Height);
    Layer->SourceType = source_image;
    return Layer;
}

internal void
LoadTestFootage(project_data *File, project_state *State, memory *Memory)
{
    CreateLayerFromSource(File, State, Memory, "../asset/24.mp4");
    // project_layer *Layer1 = CreateDebugLayer(&File, &Memory, 9, 14);
    // project_layer *Layer1 = CreateSolidLayer(&File, &Memory, 9, 13, V4(1.0, 1.0, 1.0, 1.0));
    // Layer1->x.CurrentValue.f = 7;
    // Layer1->y.CurrentValue.f = 4;
    // Layer1->StartFrame = 0;
    // Layer1->EndFrame = File.EndFrame;
}

internal void
CreateDemoScene(project_data *File, memory *Memory)
{
    project_layer *Layer1 = CreateSolidLayer(File, Memory, 720, 1280, V4(0.0, 0.0, 0.0, 1.0));
    Layer1->x.CurrentValue.f = 1280/2;
    Layer1->y.CurrentValue.f = 720/2;
    Layer1->StartFrame = 0;
    Layer1->EndFrame = File->EndFrame;
    project_layer *Layer2 = CreateSolidLayer(File, Memory, 499, 503, V4(0.0, 1.0, 0.4, 1.0));
    Layer2->x.CurrentValue.f = 1280/2;
    Layer2->y.CurrentValue.f = 720/2;
    Layer2->StartFrame = 0;
    Layer2->EndFrame = File->EndFrame;
    ManualKeyframeInsertF(&Layer2->rotation, Memory, 2, 0);
    ManualKeyframeInsertF(&Layer2->rotation, Memory, 50, 360);
    Layer2->rotation.IsToggled = true;
    Layer2->scale.IsToggled = true;
    project_layer *Layer3 = CreateSolidLayer(File, Memory, 157, 163, V4(1.0, 0.3, 0.2, 1.0));
    Layer3->x.CurrentValue.f = 1280/4;
    Layer3->y.CurrentValue.f = 720/4;
    Layer3->opacity.CurrentValue.f = 0.5f;
    Layer3->StartFrame = 0;
    Layer3->EndFrame = File->EndFrame;
    ManualKeyframeInsertF(&Layer3->x, Memory, 2,  Layer3->x.CurrentValue.f);
    ManualKeyframeInsertF(&Layer3->x, Memory, 30, Layer3->x.CurrentValue.f+(1280/2));
    ManualKeyframeInsertF(&Layer3->x, Memory, 60, Layer3->x.CurrentValue.f+(1280/3));
    Layer3->x.IsToggled = true;
    Layer3->y.IsToggled = true;
}

internal void
CreateGrid(project_data *File, memory *Memory) {
    uint16 Amount = 8;
    real32 XInc = File->Width / Amount;
    real32 YInc = File->Height / Amount;
    for (int16 j = 0; j < 8; j++) {
        for (int16 i = 0; i < 8; i++) {
            project_layer *Layer = CreateSolidLayer(File, Memory, 200, 200, V4(0.6, 0.3, 0.4, 1.0));
            Layer->x.CurrentValue.f = (XInc*i);
            Layer->y.CurrentValue.f = (XInc*j);
            Layer->opacity.CurrentValue.f = 0.25;
            Layer->StartFrame = 0;
            Layer->EndFrame = File->EndFrame;
            ManualKeyframeInsertF(&Layer->rotation, Memory, i, 0);
            ManualKeyframeInsertF(&Layer->rotation, Memory, 40+i, 360);
        }
    }
}