// Aseprite
// Copyright (C) 2019-2022  Igara Studio S.A.
// Copyright (C) 2001-2018  David Capello
//
// This program is distributed under the terms of
// the End-User License Agreement for Aseprite.

#ifdef HAVE_CONFIG_H
  #include "config.h"
#endif

#include "app/color.h"
#include "app/commands/command.h"
#include "app/commands/filters/color_curve_editor.h"
#include "app/commands/filters/filter_manager_impl.h"
#include "app/commands/filters/filter_window.h"
#include "app/commands/filters/filter_worker.h"
#include "app/commands/new_params.h"
#include "app/context.h"
#include "app/ini_file.h"
#include "doc/sprite.h"
#include "filters/color_curve.h"
#include "filters/color_curve_filter.h"
#include "ui/ui.h"

namespace app {

using namespace filters;

struct ColorCurveParams : public NewParams {
  Param<bool> ui{ this, true, "ui" };
  Param<filters::Target> channels{ this, 0, "channels" };
  Param<filters::ColorCurve> curve{ this, filters::ColorCurve(), "curve" };
};

class ColorCurveWindow : public FilterWindow {
public:
  ColorCurveWindow(ColorCurveFilter& filter, FilterManagerImpl& filterMgr)
    : FilterWindow("Color Curve",
                   "ColorCurve",
                   &filterMgr,
                   WithChannelsSelector,
                   WithoutTiledCheckBox)
    , m_filter(filter)
    , m_editor(filter.getCurve(), gfx::Rect(0, 0, 256, 256))
  {
    m_view.attachToView(&m_editor);
    m_view.setExpansive(true);
    m_view.setMinSize(gfx::Size(128, 64));

    getContainer()->addChild(&m_view);

    m_editor.CurveEditorChange.connect(&ColorCurveWindow::onCurveChange, this);
  }

protected:
  void onCurveChange()
  {
    stopPreview();

    // The color curve in the filter is the same refereced by the
    // editor. But anyway, we have to re-set the same curve in the
    // filter to regenerate the map used internally by the filter
    // (which is calculated inside setCurve() method).
    m_filter.setCurve(m_editor.getCurve());

    restartPreview();
  }

private:
  ColorCurveFilter& m_filter;
  ui::View m_view;
  ColorCurveEditor m_editor;
};

class ColorCurveCommand : public CommandWithNewParams<ColorCurveParams> {
public:
  ColorCurveCommand();

protected:
  bool onEnabled(Context* context) override;
  void onExecute(Context* context) override;
};

ColorCurveCommand::ColorCurveCommand()
  : CommandWithNewParams<ColorCurveParams>(CommandId::ColorCurve(), CmdRecordableFlag)
{
}

bool ColorCurveCommand::onEnabled(Context* context)
{
  return context->checkFlags(ContextFlags::ActiveDocumentIsWritable |
                             ContextFlags::HasActiveSprite);
}

void ColorCurveCommand::onExecute(Context* context)
{
  const bool ui = (params().ui() && context->isUIAvailable());
  ColorCurveFilter filter;

  // Default curve
  if (ui) {
    static std::unique_ptr<ColorCurve> the_curve;
    if (!the_curve) {
      // TODO load the curve?
      the_curve.reset(new ColorCurve(ColorCurve::Linear));
      the_curve->addDefaultPoints();
    }
    filter.setCurve(*the_curve.get());
  }

  FilterManagerImpl filterMgr(context, &filter);

  filters::Target channels = TARGET_RED_CHANNEL | TARGET_GREEN_CHANNEL | TARGET_BLUE_CHANNEL |
                             TARGET_GRAY_CHANNEL;
  if (params().channels.isSet())
    channels = params().channels();
  filterMgr.setTarget(channels);

  if (params().curve.isSet())
    filter.setCurve(params().curve());
  else if (!ui) {
    ColorCurve curve;
    curve.addDefaultPoints();
    filter.setCurve(curve);
  }

  if (ui) {
    ColorCurveWindow window(filter, filterMgr);
    if (window.doModal()) {
      // TODO save the curve?
    }
  }
  else {
    start_filter_worker(&filterMgr);
  }
}

Command* CommandFactory::createColorCurveCommand()
{
  return new ColorCurveCommand;
}

} // namespace app
