// Aseprite
// Copyright (C) 2019-2021  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.

#ifndef APP_TOOLS_INTERTWINE_H_INCLUDED
#define APP_TOOLS_INTERTWINE_H_INCLUDED
#pragma once

#include "app/tools/stroke.h"
#include "doc/algo.h"
#include "gfx/point.h"
#include "gfx/rect.h"

namespace app { namespace tools {
class ToolLoop;

// Converts a sequence of points in several call to
// Intertwine::doPointshapePoint(). Basically each implementation
// says which pixels should be drawn between a sequence of
// user-defined points.
class Intertwine {
public:
  virtual ~Intertwine() {}
  virtual bool snapByAngle() { return false; }
  virtual void prepareIntertwine(ToolLoop* loop) {}

  // The given stroke must be relative to the cel origin.
  virtual void joinStroke(ToolLoop* loop, const Stroke& stroke) = 0;
  virtual void fillStroke(ToolLoop* loop, const Stroke& stroke) = 0;

  virtual gfx::Rect getStrokeBounds(ToolLoop* loop, const Stroke& stroke);

  // Special region to force when the modify_tilemap_cel_region()
  // is called to restore the m_dstTileset from the m_dstImage
  // in ExpandCelCanvas::validateDestTileset.
  virtual gfx::Region forceTilemapRegionToValidate() { return gfx::Region(); }

  struct LineData {
    ToolLoop* loop;
    Stroke::Pt a, b, pt;
    float t, step;
    LineData(ToolLoop* loop, const Stroke::Pt& a, const Stroke::Pt& b);
    void doStep(int x, int y);
  };

protected:
  virtual void doTransformPoint(const Stroke::Pt& pt, ToolLoop* loop);
  virtual void doPointshapeStrokePt(const Stroke::Pt& pt, ToolLoop* loop);
  // The given point must be relative to the cel origin.
  static void doPointshapePoint(int x, int y, ToolLoop* loop);
  static void doPointshapePointDynamics(int x, int y, LineData* data);
  static void doPointshapeHline(int x1, int y, int x2, ToolLoop* loop);
  // TODO We should remove this function and always use dynamics
  static void doPointshapeLineWithoutDynamics(int x1, int y1, int x2, int y2, ToolLoop* loop);
  static void doPointshapeLine(const Stroke::Pt& a, const Stroke::Pt& b, ToolLoop* loop);

  static doc::AlgoLineWithAlgoPixel getLineAlgo(ToolLoop* loop,
                                                const Stroke::Pt& a,
                                                const Stroke::Pt& b);
};

}} // namespace app::tools

#endif // TOOLS_INTERTWINE_H_INCLUDED
