#include "tools/tool.h"

#include "tools/toolutils.h"

#include "tools/cursors.h"

#include "tstrokeutil.h"

#include "tmathutil.h"

#include "tgl.h"

#include "tstroke.h"

#include "toonz/tobjecthandle.h"

#include "toonz/txshlevelhandle.h"

#include "toonz/tstageobject.h"

#ifdef _DEBUG

#include "tcolorstyles.h"

#include "tsimplecolorstyles.h"

#include "tstrokeoutline.h"

#include "tpalette.h"

#endif

using namespace ToolUtils;

namespace {

const int MY_ERROR = -1;

//=============================================================================

// Iron

//-----------------------------------------------------------------------------

// index must be between 0 and controlPointCount-1

inline bool isIncluded(int index, int left, int rigth) {

  if (left < rigth) {

    return left <= index && index <= rigth;

  } else {

    return left <= index || index <= rigth;

  }

}

//=============================================================================

// IronTool

//-----------------------------------------------------------------------------

class IronTool final : public TTool {

  TStroke *m_strokeRef, *m_oldStroke;

  TUndo *m_undo;

  DoublePair m_range;

  bool m_draw;

  bool m_dragged;

  TThickPoint m_cursor;

  int m_selectedStroke;

  TPointD m_beginPoint;

  int m_cpIndexMin, m_cpIndexMax;

  bool m_active;

  int m_cursorId;

public:

  IronTool()

      : TTool("T_Iron")

      , m_strokeRef(0)

      , m_draw(false)

      , m_active(false)

      , m_dragged(false)

      , m_undo(0)

      , m_cpIndexMin(-1)

      , m_cpIndexMax(-1)

      , m_oldStroke(0)

      , m_cursorId(ToolCursor::IronCursor) {

    bind(TTool::Vectors);

  }

  ToolType getToolType() const override { return TTool::LevelWriteTool; }

  void draw() override {

    if (m_draw && (TVectorImageP)getImage(false)) {

      glColor3d(1, 0, 1);

      if (m_cursor.thick > 0) tglDrawCircle(m_cursor, m_cursor.thick);

      tglDrawCircle(m_cursor, m_cursor.thick + 4 * getPixelSize());

    }

  }

  void leftButtonDown(const TPointD &pos, const TMouseEvent &) override {

    if (m_active) return;

    assert(m_undo == 0);

    m_active = false;

    TVectorImageP vi = TImageP(getImage(true));

    if (!vi) return;

    // select nearest stroke and finds its parameter

    double dist;

    UINT stroke;

    if (!vi->getNearestStroke(pos, m_range.first, stroke, dist)) {

      m_strokeRef      = 0;

      m_selectedStroke = MY_ERROR;

      m_draw           = false;

    } else {

      m_draw           = true;

      m_active         = true;

      m_strokeRef      = vi->getStroke(stroke);

      m_selectedStroke = stroke;

      m_beginPoint     = m_strokeRef->getPoint(m_range.first);

      m_oldStroke      = new TStroke(*vi->getStroke(stroke));

      m_range.second = m_range.first;

      if (TTool::getApplication()->getCurrentObject()->isSpline())

        m_undo = new UndoPath(

            getXsheet()->getStageObject(getObjectId())->getSpline());

      else {

        TXshSimpleLevel *sl =

            TTool::getApplication()->getCurrentLevel()->getSimpleLevel();

        assert(sl);

        TFrameId id = getCurrentFid();

        m_undo      = new UndoModifyStrokeAndPaint(sl, id, stroke);

      }

    }

    if (m_strokeRef) m_cpIndexMin = m_strokeRef->getControlPointCount();

    m_cpIndexMax                  = -1;

    invalidate();

  }

  void leftButtonDrag(const TPointD &pos, const TMouseEvent &e) override {

    TVectorImageP vi(getImage(true));

    if (!m_active || !vi || !m_strokeRef) {

      delete m_undo;

      m_undo = 0;

      return;

    }

    m_range.second = m_strokeRef->getW(pos);

    m_cursor       = m_strokeRef->getThickPoint(m_range.second);

    double v0        = std::min(m_range.first, m_range.second);

    double v1        = std::max(m_range.first, m_range.second);

    const double eps = 0.005;

    if (v1 - v0 < eps && !(m_strokeRef->isSelfLoop() && 1 - (v1 - v0) < eps)) {

      invalidate();

      return;

    }

    TPointD point2 = m_strokeRef->getPoint(m_range.second);

    double tdist2  = tdistance2(m_beginPoint, point2);

    double pixelSize = getPixelSize();

    if (tdist2 < 100 * pixelSize * pixelSize) {

      invalidate();

      return;

    }

    double draggedStrokeLen = m_strokeRef->getLength(v0, v1);

    double totalStrokeLen = m_strokeRef->getLength();

    bool direction = !m_strokeRef->isSelfLoop() ||

                     draggedStrokeLen < totalStrokeLen - draggedStrokeLen;

    if (!direction) {

      draggedStrokeLen = totalStrokeLen - draggedStrokeLen;

      std::swap(v0, v1);

    }

    // se la lunghezza della parte di stroke tra i due punti di inizio e fine

    // drag

    // e' piu' del quadruplo della distanza tra i due punti, allora non si fa

    // nulla perche'

    // molto probabilmente si sta facendo drag tra due punti vicini di una curva

    // piu' lunga

    if ((draggedStrokeLen * draggedStrokeLen) > 16.0 * tdist2) {

      m_beginPoint = point2;

      return;

    }

    int i;

    int maxCP = m_strokeRef->getControlPointCount() - 1;

    // iCP0 is the control point index before v0 (or just on v0)

    int iCP0 = (int)(maxCP * v0);

    int iCP1 = m_strokeRef->getControlPointIndexAfterParameter(v1);

    if (iCP0 > maxCP) {

      if (!direction)

        iCP0 = maxCP;

      else {

        invalidate();

        return;

      }

    }

    if (iCP1 > maxCP) iCP1 = maxCP;

    if (direction && (iCP1 - iCP0) < 2) {

      invalidate();

      return;

    }

    if (!direction && maxCP + 1 - (iCP1 - iCP0) < 3) {

      invalidate();

      return;

    }

    //*********************************************** point of no return

    //**************************

    m_dragged    = true;

    m_beginPoint = point2;

    if (!m_strokeRef->isSelfLoop()) {

      if (m_cpIndexMin > iCP0) m_cpIndexMin = iCP0;

      if (m_cpIndexMax < iCP1) m_cpIndexMax = iCP1;

    } else {

      if (m_cpIndexMin == m_strokeRef->getControlPointCount() &&

          m_cpIndexMax == -1) {

        m_cpIndexMin = iCP0;

        m_cpIndexMax = iCP1;

      } else {

        if (isIncluded(iCP0, m_cpIndexMin, m_cpIndexMax)) {

          if (!isIncluded(iCP1, m_cpIndexMin, m_cpIndexMax)) {

            m_cpIndexMax = iCP1;

          }

        } else if (isIncluded(iCP1, m_cpIndexMin, m_cpIndexMax)) {

          assert(!isIncluded(iCP0, m_cpIndexMin, m_cpIndexMax));

          m_cpIndexMin = iCP0;

        } else {

          int sgn             = tsign(m_range.second - m_range.first);

          if (!direction) sgn = -sgn;

          switch (sgn) {

          case 1:

            m_cpIndexMax = iCP1;

            break;

          case -1:

            m_cpIndexMin = iCP0;

            break;

          case 0:

            assert(0);

          default:

            assert(0);

          }

        }

      }

    }

    m_range.first = m_range.second;

    assert(m_cpIndexMin != m_cpIndexMax);

    v0 = m_strokeRef->getParameterAtControlPoint(iCP0);

    v1 = m_strokeRef->getParameterAtControlPoint(iCP1);

    // double smoothFactor =

    // getApplication()->getVectorToolsParameters().getToolSize();

    // smoothFactor *= 0.01;

    // smoothFactor = (smoothFactor*smoothFactor*smoothFactor)*0.7;

    const double smoothFactor = 0.08;

    double wDistance = (direction) ? v1 - v0 : 1 - (v0 - v1);

    double smoothFP = smoothFactor / wDistance;

    TPointD pf0 = m_strokeRef->getControlPoint(iCP0) * smoothFP;

    TPointD pf1 = m_strokeRef->getControlPoint(iCP1) * smoothFP;

    TPointD appDPoint;

    TThickPoint appThickPoint;

    double oppSmoothFactor = 1.0 - smoothFactor;

    double vp, v1vp, vpv0;

    i = (iCP0 == maxCP || (iCP0 == 0 && !direction)) ? 1 : iCP0 + 1;

    for (; i != iCP1;) {

      vp = m_strokeRef->getParameterAtControlPoint(i);

      appThickPoint = m_strokeRef->getControlPoint(i);

      appDPoint     = appThickPoint;

      v1vp = v1 - vp;

      if (v1vp < 0) {

        if (!direction)

          v1vp += 1;

        else

          assert(0);

      }

      vpv0 = vp - v0;

      if (vpv0 < 0) {

        if (!direction)

          vpv0 += 1;

        else

          assert(0);

      }

      assert(isAlmostZero(v1vp + vpv0 - wDistance));

      assert(isAlmostZero((smoothFP * v1vp + smoothFP * vpv0) +

                          oppSmoothFactor - 1.0));

      m_strokeRef->setControlPoint(

          i, TThickPoint(pf0 * v1vp + pf1 * vpv0 + appDPoint * oppSmoothFactor,

                         appThickPoint.thick));

      // this is like

      //

      // averageP = ( p0*(v1-vp)/(v1-v0) + p1*(vp-v0)/(v1-v0));

      // newCP(i) = oldCP(i)*(1-smoothFactor) + averageP*smoothFactor

      //

      // but faster

      i++;

      if (i == maxCP + 1) {

        m_strokeRef->setControlPoint(0, m_strokeRef->getControlPoint(maxCP));

        i = 1;

      }

    }

    m_strokeRef->invalidate();

    invalidate();

    notifyImageChanged();

  }

  void leftButtonUp(const TPointD &pos, const TMouseEvent &) override {

    if (!m_active) return;

    m_active = false;

    invalidate();

    TVectorImageP vi(getImage(true));

    if (!vi || !m_strokeRef || !m_dragged) {

      delete m_undo;

      m_undo = 0;

      return;

    }

    QMutexLocker lock(vi->getMutex());

    // TStroke *oldStroke = new TStroke(*(vi->getStroke(m_selectedStroke)));

    //------------------------------------------------------------------------------

    UINT cpCount = m_strokeRef->getControlPointCount();

    m_cpIndexMin &= ~1;  // nearest even value less or equal to m_cpIndexMin

    if (m_cpIndexMax & 1)  // odd

      m_cpIndexMax++;

    int i      = 0;

    UINT count = 0;

    if ((m_cpIndexMin == 0 && (UINT)m_cpIndexMax == cpCount - 1) ||

        (m_cpIndexMin == m_cpIndexMax && m_strokeRef->isSelfLoop())) {

      /*

e' meglio rilevarli i corners.

Tanto se hai appiattito abbastanza, se ne vanno da soli,

senza lasciare ingrati compiti alla reuceControlPoints

Altrimenti non si fa altro che aumentarli i punti di controllo

*/

      std::vector<int> corners;</int>

      corners.push_back(0);

      detectCorners(m_strokeRef, 45, corners);

      corners.push_back(m_strokeRef->getChunkCount());

      m_strokeRef->reduceControlPoints(2.0 * getPixelSize(), corners);

    } else {

      if (m_cpIndexMin < m_cpIndexMax) {

        std::vector<tthickpoint> hitPoints(m_cpIndexMax - m_cpIndexMin + 1);</tthickpoint>

        count = 0;

        for (i = m_cpIndexMin; i <= m_cpIndexMax; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        TStroke *newStroke = new TStroke(hitPoints);

        std::vector<int> corners;</int>

        corners.push_back(0);

        detectCorners(newStroke, 45, corners);

        corners.push_back(newStroke->getChunkCount());

        newStroke->reduceControlPoints(2.0 * getPixelSize(), corners);

        hitPoints.resize(m_cpIndexMin + newStroke->getControlPointCount() +

                         cpCount - 1 - m_cpIndexMax);

        count = 0;

        for (i = 0; i < m_cpIndexMin; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        for (i = 0; i < newStroke->getControlPointCount(); i++) {

          hitPoints[count++] = newStroke->getControlPoint(i);

        }

        for (i = m_cpIndexMax + 1; i < (int)cpCount; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        m_strokeRef->reshape(&hitPoints[0], hitPoints.size());

        delete newStroke;

      } else {

        assert(m_cpIndexMin != m_cpIndexMax);

        std::vector<tthickpoint> hitPoints(cpCount - m_cpIndexMin);</tthickpoint>

        count = 0;

        for (i = m_cpIndexMin; i < (int)cpCount; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        TStroke *newStroke1 = new TStroke(hitPoints);

        std::vector<int> corners;</int>

        corners.push_back(0);

        detectCorners(newStroke1, 45, corners);

        corners.push_back(newStroke1->getChunkCount());

        newStroke1->reduceControlPoints(2.0 * getPixelSize(), corners);

        hitPoints.resize(m_cpIndexMax + 1);

        count = 0;

        for (i = 0; i <= m_cpIndexMax; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        TStroke *newStroke2 = new TStroke(hitPoints);

        corners.clear();

        corners.push_back(0);

        detectCorners(newStroke2, 45, corners);

        corners.push_back(newStroke2->getChunkCount());

        newStroke2->reduceControlPoints(2.0 * getPixelSize(), corners);

        hitPoints.resize(newStroke1->getControlPointCount() +

                         newStroke2->getControlPointCount() + m_cpIndexMin -

                         m_cpIndexMax - 1);

        count = 0;

        for (i = 0; i < newStroke2->getControlPointCount(); i++) {

          hitPoints[count++] = newStroke2->getControlPoint(i);

        }

        for (i = m_cpIndexMax + 1; i < m_cpIndexMin; i++) {

          hitPoints[count++] = m_strokeRef->getControlPoint(i);

        }

        for (i = 0; i < newStroke1->getControlPointCount(); i++) {

          hitPoints[count++] = newStroke1->getControlPoint(i);

        }

        m_strokeRef->reshape(&hitPoints[0], hitPoints.size());

        delete newStroke1;

        delete newStroke2;

      }

    }

    invalidate();

    m_dragged = false;

    assert(m_undo);

    assert(m_oldStroke);

    vi->notifyChangedStrokes(m_selectedStroke, m_oldStroke);

    TUndoManager::manager()->add(m_undo);

    m_undo = 0;

    delete m_oldStroke;

  }

  void invalidateCursorArea() {

    double r = m_cursor.thick + 6;

    TPointD d(r, r);

    invalidate(TRectD(m_cursor - d, m_cursor + d));

  }

  void mouseMove(const TPointD &pos, const TMouseEvent &e) override {

    TVectorImageP vi = TImageP(getImage(true));

    if (!vi) {

      m_draw = false;

      return;

    }

    // select nearest stroke and finds its parameter

    double dist, pW;

    UINT stroke;

    if (vi->getNearestStroke(pos, pW, stroke, dist)) {

      m_draw             = true;

      TStroke *strokeRef = vi->getStroke(stroke);

      m_cursor           = strokeRef->getThickPoint(pW);

    } else {

      m_draw = false;

    }

    invalidate();

  }

  bool moveCursor(const TPointD &pos) { return false; }

  void onActivate() override {

    //      getApplication()->editImageOrSpline();

  }

  void onLeave() override { m_draw = false; }

  int getCursorId() const override { return m_cursorId; }

  void onEnter() override {

    m_draw = true;

    if ((TVectorImageP)getImage(false))

      m_cursorId = ToolCursor::IronCursor;

    else

      m_cursorId = ToolCursor::CURSOR_NO;

  }

} ironTool;

//-----------------------------------------------------------------------------

#ifdef _DEBUG

void drawPoint(const TPointD &p, double pixelSize) {

  double sizeX = pixelSize;

  double sizeY = pixelSize;

  glBegin(GL_QUADS);

  glVertex2d(p.x - sizeX, p.y - sizeY);

  glVertex2d(p.x - sizeX, p.y + sizeY);

  glVertex2d(p.x + sizeX, p.y + sizeY);

  glVertex2d(p.x + sizeX, p.y - sizeY);

  glEnd();

  return;

}

//-----------------------------------------------------------------------------

void drawControlPoints(const TStroke *&stroke, double pixelSize) {

  int n = stroke->getChunkCount();

  int i = 0;

  for (i = 0; i < n; ++i) {

    const TThickQuadratic *chunk = stroke->getChunk(i);

    TPointD p0                   = chunk->getP0();

    TPointD p1                   = chunk->getP1();

    glColor3d(1.0, 0.0, 0.0);

    drawPoint(p0, pixelSize);

    glColor3d(1.0, 1.0, 1.0);

    drawPoint(p1, pixelSize);

  }

  const TThickQuadratic *chunk = stroke->getChunk(n - 1);

  glColor3d(1.0, 0.0, 0.0);

  TPointD p2 = chunk->getP2();

  drawPoint(p2, pixelSize);

  return;

}

// end solo per debug

#endif

}  // namespace

// TTool *getIronTool() {return &ironTool;}