/*
 * Copyright (c) 2021 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

/**
 * @file simple-text-renderer-example.cpp
 * @brief Basic usage of Text Renderer utility.
 */

// EXTERNAL INCLUDES
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/text/text-utils-devel.h>
#include <dali/devel-api/adaptor-framework/image-loading.h>
#include <dali/devel-api/adaptor-framework/pixel-buffer.h>

// INTERNAL INCLUDES
#include "generated/simple-text-renderer-frag.h"
#include "generated/simple-text-renderer-vert.h"

using namespace std;
using namespace Dali;
using namespace Dali::Toolkit;

namespace
{
const std::string IMAGE1 = DEMO_IMAGE_DIR "application-icon-1.png";
const std::string IMAGE2 = DEMO_IMAGE_DIR "application-icon-6.png";

Renderer CreateRenderer()
{
  // Create the geometry.
  struct Vertex
  {
    Dali::Vector2 position;
    Dali::Vector2 texCoord;
  };

  static const Vertex vertices[] = {{Dali::Vector2(-0.5f, -0.5f), Dali::Vector2(0.0f, 0.0f)},
                                    {Dali::Vector2(0.5f, -0.5f), Dali::Vector2(1.0f, 0.0f)},
                                    {Dali::Vector2(-0.5f, 0.5f), Dali::Vector2(0.0f, 1.0f)},
                                    {Dali::Vector2(0.5f, 0.5f), Dali::Vector2(1.0f, 1.0f)}};

  Property::Map property;
  property.Add("aPosition", Property::VECTOR2).Add("aTexCoord", Property::VECTOR2);

  VertexBuffer vertexBuffer = VertexBuffer::New(property);

  vertexBuffer.SetData(vertices, sizeof(vertices) / sizeof(Vertex));

  Geometry geometry = Geometry::New();
  geometry.AddVertexBuffer(vertexBuffer);

  geometry.SetType(Geometry::TRIANGLE_STRIP);

  // Create the shader
  Shader shader = Shader::New(SHADER_SIMPLE_TEXT_RENDERER_VERT, SHADER_SIMPLE_TEXT_RENDERER_FRAG);

  // Create the renderer

  Renderer renderer = Renderer::New(geometry, shader);

  return renderer;
}

TextureSet CreateTextureSet(const Dali::Toolkit::DevelText::RendererParameters& textParameters, const std::vector<std::string>& embeddedItems)
{
  Dali::Vector<Dali::Toolkit::DevelText::EmbeddedItemInfo> embeddedItemLayout;

  Devel::PixelBuffer pixelBuffer = Toolkit::DevelText::Render(textParameters, embeddedItemLayout);

  const int dstWidth  = static_cast<int>(pixelBuffer.GetWidth());
  const int dstHeight = static_cast<int>(pixelBuffer.GetHeight());

  unsigned int index = 0u;
  for(const auto& itemLayout : embeddedItemLayout)
  {
    int width  = static_cast<int>(itemLayout.size.width);
    int height = static_cast<int>(itemLayout.size.height);
    int x      = static_cast<int>(itemLayout.position.x);
    int y      = static_cast<int>(itemLayout.position.y);

    Dali::Devel::PixelBuffer itemPixelBuffer = Dali::LoadImageFromFile(embeddedItems[index++]);
    itemPixelBuffer.Resize(width, height);
    itemPixelBuffer.Rotate(itemLayout.angle);

    width  = static_cast<int>(itemPixelBuffer.GetWidth());
    height = static_cast<int>(itemPixelBuffer.GetHeight());

    Dali::Pixel::Format itemPixelFormat = itemPixelBuffer.GetPixelFormat();

    // Check if the item is out of the buffer.

    if((x + width < 0) ||
       (x > dstWidth) ||
       (y < 0) ||
       (y - height > dstHeight))
    {
      // The embedded item is completely out of the buffer.
      continue;
    }

    // Crop if it exceeds the boundaries of the destination buffer.
    int layoutX   = 0;
    int layoutY   = 0;
    int cropX     = 0;
    int cropY     = 0;
    int newWidth  = width;
    int newHeight = height;

    bool crop = false;

    if(0 > x)
    {
      newWidth += x;
      cropX = std::abs(x);
      crop  = true;
    }
    else
    {
      layoutX = x;
    }

    if(cropX + newWidth > dstWidth)
    {
      crop = true;
      newWidth -= ((cropX + newWidth) - dstWidth);
    }

    layoutY = y;
    if(0.f > layoutY)
    {
      newHeight += layoutY;
      cropY = std::abs(layoutY);
      crop  = true;
    }

    if(cropY + newHeight > dstHeight)
    {
      crop = true;
      newHeight -= ((cropY + newHeight) - dstHeight);
    }

    uint16_t uiCropX     = static_cast<uint16_t>(cropX);
    uint16_t uiCropY     = static_cast<uint16_t>(cropY);
    uint16_t uiNewWidth  = static_cast<uint16_t>(newWidth);
    uint16_t uiNewHeight = static_cast<uint16_t>(newHeight);

    if(crop)
    {
      itemPixelBuffer.Crop(uiCropX, uiCropY, uiNewWidth, uiNewHeight);
    }

    // Blend the item pixel buffer with the text's color according its blending mode.
    if(Dali::TextAbstraction::ColorBlendingMode::MULTIPLY == itemLayout.colorBlendingMode)
    {
      Dali::Devel::PixelBuffer buffer = Dali::Devel::PixelBuffer::New(uiNewWidth,
                                                                      uiNewHeight,
                                                                      itemPixelFormat);

      unsigned char*       bufferPtr     = buffer.GetBuffer();
      const unsigned char* itemBufferPtr = itemPixelBuffer.GetBuffer();
      const unsigned int   bytesPerPixel = Dali::Pixel::GetBytesPerPixel(itemPixelFormat);
      const unsigned int   size          = uiNewWidth * uiNewHeight * bytesPerPixel;

      for(unsigned int i = 0u; i < size; i += bytesPerPixel)
      {
        *(bufferPtr + 0u) = static_cast<unsigned char>(static_cast<float>(*(itemBufferPtr + 0u)) * textParameters.textColor.r);
        *(bufferPtr + 1u) = static_cast<unsigned char>(static_cast<float>(*(itemBufferPtr + 1u)) * textParameters.textColor.g);
        *(bufferPtr + 2u) = static_cast<unsigned char>(static_cast<float>(*(itemBufferPtr + 2u)) * textParameters.textColor.b);
        *(bufferPtr + 3u) = static_cast<unsigned char>(static_cast<float>(*(itemBufferPtr + 3u)) * textParameters.textColor.a);

        itemBufferPtr += bytesPerPixel;
        bufferPtr += bytesPerPixel;
      }

      itemPixelBuffer = buffer;
    }

    Dali::Toolkit::DevelText::UpdateBuffer(itemPixelBuffer, pixelBuffer, layoutX, layoutY, true);
  }

  PixelData pixelData = Devel::PixelBuffer::Convert(pixelBuffer);

  Texture texture = Texture::New(TextureType::TEXTURE_2D,
                                 pixelData.GetPixelFormat(),
                                 pixelData.GetWidth(),
                                 pixelData.GetHeight());
  texture.Upload(pixelData);

  TextureSet textureSet = TextureSet::New();
  textureSet.SetTexture(0u, texture);

  return textureSet;
}

} // namespace

/**
 * @brief The main class of the demo.
 */
class SimpleTextRendererExample : public ConnectionTracker
{
public:
  SimpleTextRendererExample(Application& application)
  : mApplication(application)
  {
    // Connect to the Application's Init signal
    mApplication.InitSignal().Connect(this, &SimpleTextRendererExample::Create);
  }

  ~SimpleTextRendererExample()
  {
    // Nothing to do here.
  }

  /**
   * One-time setup in response to Application InitSignal.
   */
  void Create(Application& application)
  {
    Window window = application.GetWindow();
    window.SetBackgroundColor(Color::WHITE);
    window.SetBackgroundColor(Vector4(0.04f, 0.345f, 0.392f, 1.0f));

    window.KeyEventSignal().Connect(this, &SimpleTextRendererExample::OnKeyEvent);

    const std::string image1 = "<item 'width'=26 'height'=26 'url'='" + IMAGE1 + "'/>";
    const std::string image2 = "<item 'width'=26 'height'=26/>";

    Dali::Toolkit::DevelText::RendererParameters textParameters;
    textParameters.text                = "Hello " + image1 + " world " + image2 + " this " + image1 + " is " + image2 + " a " + image1 + " demo " + image2 + " of " + image1 + " circular " + image2 + " text " + image1 + " width " + image2 + " icons.";
    textParameters.horizontalAlignment = "center";
    textParameters.verticalAlignment   = "center";
    textParameters.circularAlignment   = "center";
    textParameters.fontFamily          = "SamsungUI";
    textParameters.fontWeight          = "";
    textParameters.fontWidth           = "";
    textParameters.fontSlant           = "";
    textParameters.layout              = "circular";
    textParameters.textColor           = Color::BLACK;
    textParameters.fontSize            = 25.f;
    textParameters.textWidth           = 360u;
    textParameters.textHeight          = 360u;
    textParameters.radius              = 180u;
    textParameters.beginAngle          = 15.f;
    textParameters.incrementAngle      = 360.f;
    textParameters.ellipsisEnabled     = true;
    textParameters.markupEnabled       = true;

    std::vector<std::string> embeddedItems = {IMAGE2, IMAGE2, IMAGE2, IMAGE2, IMAGE2};

    TextureSet textureSet = CreateTextureSet(textParameters, embeddedItems);

    Renderer renderer = CreateRenderer();
    renderer.SetTextures(textureSet);

    Actor actor = Actor::New();
    actor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
    actor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
    actor.SetProperty(Actor::Property::POSITION, Vector2(0.f, 0.f));
    actor.SetProperty(Actor::Property::SIZE, Vector2(360.f, 360.f));
    actor.SetProperty(Actor::Property::COLOR, Color::WHITE);

    actor.AddRenderer(renderer);

    window.Add(actor);
  }

  /**
   * Main key event handler
   */
  void OnKeyEvent(const KeyEvent& event)
  {
    if(event.GetState() == KeyEvent::DOWN)
    {
      if(IsKey(event, DALI_KEY_ESCAPE) || IsKey(event, DALI_KEY_BACK))
      {
        mApplication.Quit();
      }
    }
  }

private:
  Application& mApplication;
};

/** Entry point for Linux & Tizen applications */
int DALI_EXPORT_API main(int argc, char** argv)
{
  Application application = Application::New(&argc, &argv);

  SimpleTextRendererExample test(application);

  application.MainLoop();

  return 0;
}