/************************************************************************
 **
 **  @file   vppiece.cpp
 **  @author Ronan Le Tiec
 **  @date   13 4, 2020
 **
 **  @brief
 **  @copyright
 **  This source code is part of the Valentina project, a pattern making
 **  program, whose allow create and modeling patterns of clothing.
 **  Copyright (C) 2020 Valentina project
 **  <https://gitlab.com/smart-pattern/valentina> All Rights Reserved.
 **
 **  Valentina is free software: you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License as published by
 **  the Free Software Foundation, either version 3 of the License, or
 **  (at your option) any later version.
 **
 **  Valentina is distributed in the hope that it will be useful,
 **  but WITHOUT ANY WARRANTY; without even the implied warranty of
 **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 **  GNU General Public License for more details.
 **
 **  You should have received a copy of the GNU General Public License
 **  along with Valentina.  If not, see <http://www.gnu.org/licenses/>.
 **
 *************************************************************************/
#include "vppiece.h"

#include <QtMath>

#include "../vmisc/def.h"
#include "vpsheet.h"
#include "vplayout.h"
#include "../vlayout/vtextmanager.h"
#include "../vlayout/vlayoutpiecepath.h"

#include <QIcon>
#include <QLoggingCategory>
#include <QPainter>

Q_LOGGING_CATEGORY(pPiece, "p.piece")

namespace
{
constexpr qreal minStickyDistance = ToPixel(3, Unit::Mm);
constexpr qreal maxStickyDistance = ToPixel(10, Unit::Mm);
constexpr qreal stickyShift = ToPixel(1, Unit::Mm);

//---------------------------------------------------------------------------------------------------------------------
auto CutEdge(const QLineF &edge) -> QVector<QPointF>
{
    QVector<QPointF> points;
    if (qFuzzyIsNull(stickyShift))
    {
        points.append(edge.p1());
        points.append(edge.p2());
    }
    else
    {
        const int n = qFloor(edge.length()/stickyShift);

        if (n <= 0)
        {
            points.append(edge.p1());
            points.append(edge.p2());
        }
        else
        {
            points.reserve(n);
            const qreal nShift = edge.length()/n;
            for (int i = 1; i <= n+1; ++i)
            {
                QLineF l1 = edge;
                l1.setLength(nShift*(i-1));
                points.append(l1.p2());
            }
        }
    }
    return points;
}

//---------------------------------------------------------------------------------------------------------------------
auto PrepareStickyPath(const QVector<QPointF> &path) -> QVector<QPointF>
{
    if (path.size() < 2)
    {
        return path;
    }

    QVector<QPointF> stickyPath;

    for (int i=0; i<path.size(); ++i)
    {
        stickyPath += CutEdge(QLineF(path.at(i), path.at(i < path.size()-1 ? i+1 : 0)));
    }

    return stickyPath;
}

//---------------------------------------------------------------------------------------------------------------------
auto ClosestDistance(const QVector<QPointF> &path1, const QVector<QPointF> &path2) -> QLineF
{
    qreal distance = INT_MAX;
    QLineF closestDistance;

    for (auto p1 : path1)
    {
        for (auto p2 : path2)
        {
            QLineF d(p1, p2);
            if (d.length() <= distance)
            {
                distance = d.length();
                closestDistance = d;
            }
        }
    }

    return closestDistance;
}
}  // namespace

//---------------------------------------------------------------------------------------------------------------------
VPPiece::VPPiece(const VLayoutPiece &layoutPiece)
    : VLayoutPiece(layoutPiece)
{
    ClearTransformations();
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::Update(const VPPiecePtr &piece)
{
    if (piece.isNull())
    {
        return;
    }

    SetName(piece->GetName());
    SetCountourPoints(piece->GetContourPoints(), IsHideMainPath());
    SetSeamAllowancePoints(GetSeamAllowancePoints(), piece->IsSeamAllowance(), piece->IsSeamAllowanceBuiltIn());
    SetInternalPaths(GetInternalPaths());
    SetPassmarks(GetPassmarks());
    SetPlaceLabels(GetPlaceLabels());

    SetGrainlineEnabled(piece->IsGrainlineEnabled());
    SetGrainlineAngle(piece->GrainlineAngle());
    SetGrainlineArrowType(piece->GrainlineArrowType());
    SetGrainlinePoints(piece->GetGrainline());

    SetPieceLabelRect(piece->GetPieceLabelRect());
    SetPieceLabelData(piece->GetPieceLabelData());
    SetPatternLabelRect(piece->GetPatternLabelRect());
    SetPatternLabelData(piece->GetPatternLabelData());
}

//---------------------------------------------------------------------------------------------------------------------
QString VPPiece::GetUniqueID() const
{
    QString id = VLayoutPiece::GetUniqueID();

    if (m_copyNumber > 1)
    {
        id = id + '_' + QString::number(m_copyNumber);
    }

    return id;
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::ClearTransformations()
{
    // Reset the piece position to the default state
    QTransform matrix;
    SetMatrix(matrix);
    // translate the piece so that the top left corner of the bouding rect of the piece is at the position
    // (0,0) in the sheet coordinate system
    const QPointF offset = MappedDetailBoundingRect().topLeft();
    matrix.translate(-offset.x() ,-offset.y());
    SetMatrix(matrix);
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetPosition(QPointF point)
{
    QTransform matrix = GetMatrix();
    const QPointF offset = MappedDetailBoundingRect().topLeft();
    matrix.translate(point.x() - offset.x(), point.y() - offset.y());
    SetMatrix(matrix);
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::GetPosition() -> QPointF
{
    QTransform matrix = GetMatrix();
    return QPointF(matrix.dx(), matrix.dy());
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::RotateToGrainline(const VPTransformationOrigon &origin)
{
    VPSheetPtr sheet = Sheet();
    if (not IsGrainlineEnabled() || sheet.isNull())
    {
        return;
    }

    const QVector<QPointF> grainlinePoints = GetMappedGrainline();
    if (grainlinePoints.count() < 2)
    {
        return;
    }

    QLineF grainline(grainlinePoints.first(), grainlinePoints.last());

    QLineF canonical(grainlinePoints.first().x(), grainlinePoints.first().y(),
                     grainlinePoints.first().x()+100, grainlinePoints.first().y());

    GrainlineType grainlineType = sheet->GrainlineType();

    auto DegreesAtFront = [grainline, canonical, grainlineType]()
    {
        QLineF atFront = canonical;
        if (grainlineType == GrainlineType::Vertical)
        {
            atFront.setAngle(90);
        }

        qreal angleTo = grainline.angleTo(atFront);
        return angleTo;
    };

    auto DegreesAtRear = [grainline, canonical, grainlineType]()
    {
        QLineF atRear = canonical;
        atRear.setAngle(grainlineType == GrainlineType::Vertical ? 270 : 180);

        qreal angleTo = grainline.angleTo(atRear);
        return angleTo;
    };

    GrainlineArrowDirection type = GrainlineArrowType();
    qreal degrees = 0;

    if (type == GrainlineArrowDirection::atFront)
    {
        degrees = DegreesAtFront();
    }
    else if (type == GrainlineArrowDirection::atRear)
    {
        degrees = DegreesAtRear();
    }
    else
    {
        const qreal atFront = DegreesAtFront();
        if (atFront <= 90 || atFront >= 270)
        {
            degrees = atFront;
        }
        else
        {
            degrees = DegreesAtRear();
        }
    }

    if (origin.custom)
    {
        Rotate(MappedDetailBoundingRect().center(), degrees);
    }
    else
    {
        Rotate(origin.origin, degrees);
    }
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetGrainlineEnabled(bool enabled)
{
    VLayoutPiece::SetGrainlineEnabled(enabled);
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetGrainlineAngle(qreal angle)
{
    VLayoutPiece::SetGrainlineAngle(angle);
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetGrainlineArrowType(GrainlineArrowDirection type)
{
    VLayoutPiece::SetGrainlineArrowType(type);
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetGrainlinePoints(const QVector<QPointF> &points)
{
    VLayoutPiece::SetGrainlinePoints(points);
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::GetPieceLabelRect() const -> QVector<QPointF>
{
    return VLayoutPiece::GetPieceLabelRect();
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetPieceLabelRect(const QVector<QPointF> &rect)
{
    VLayoutPiece::SetPieceLabelRect(rect);
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::GetPieceLabelData() const -> VTextManager
{
    return VLayoutPiece::GetPieceLabelData();
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetPieceLabelData(const VTextManager &data)
{
    VLayoutPiece::SetPieceLabelData(data);
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::GetPatternLabelRect() const -> QVector<QPointF>
{
    return VLayoutPiece::GetPatternLabelRect();
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetPatternLabelRect(const QVector<QPointF> &rect)
{
    VLayoutPiece::SetPatternLabelRect(rect);
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::GetPatternLabelData() const -> VTextManager
{
    return VLayoutPiece::GetPatternLabelData();
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetPatternLabelData(const VTextManager &data)
{
    VLayoutPiece::SetPatternLabelData(data);
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::Flip()
{
    QTransform pieceMatrix = GetMatrix();
    QPointF center = pieceMatrix.map(DetailBoundingRect().center());

    QTransform m;
    m.translate(center.x(), 0);
    m.scale(-1, 1);
    m.translate(-center.x(), 0);

    pieceMatrix *= m;
    SetMatrix(pieceMatrix);
    SetMirror(!IsMirror());
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::StickyPosition(qreal &dx, qreal &dy) const -> bool
{
    VPLayoutPtr layout = Layout();
    if (layout.isNull() || not layout->LayoutSettings().GetStickyEdges())
    {
        return false;
    }

    const qreal pieceGap = layout->LayoutSettings().GetPiecesGap();
    if (pieceGap <= 0)
    {
        return false;
    }

    VPSheetPtr sheet = Sheet();
    if (sheet.isNull())
    {
        return false;
    }

    QList<VPPiecePtr> allPieces = sheet->GetPieces();

    if (allPieces.count() < 2)
    {
        return false;
    }

    QVector<QPointF> path = GetMappedExternalContourPoints();
    QRectF boundingRect = VLayoutPiece::BoundingRect(path);
    const qreal stickyDistance = pieceGap+minStickyDistance;
    QRectF stickyZone = QRectF(boundingRect.topLeft().x()-stickyDistance, boundingRect.topLeft().y()-stickyDistance,
                               boundingRect.width()+stickyDistance*2, boundingRect.height()+stickyDistance*2);

    QVector<QPointF> stickyPath = PrepareStickyPath(path);
    QLineF closestDistance;

    for (const auto& piece : allPieces)
    {
        if (piece.isNull() || piece->GetUniqueID() == GetUniqueID())
        {
            continue;
        }

        QVector<QPointF> piecePath = piece->GetMappedExternalContourPoints();
        QRectF pieceBoundingRect = VLayoutPiece::BoundingRect(piecePath);

        if (stickyZone.intersects(pieceBoundingRect) || pieceBoundingRect.contains(stickyZone) ||
                stickyZone.contains(pieceBoundingRect))
        {
            if (not VPPiece::PathsSuperposition(path, piecePath))
            {
                QVector<QPointF> pieceStickyPath = PrepareStickyPath(piecePath);
                closestDistance = ClosestDistance(stickyPath, pieceStickyPath);
            }
        }
    }

    if (closestDistance.isNull())
    {
        return false;
    }

    const qreal extraZone = qBound(minStickyDistance, pieceGap * 50 / 100, maxStickyDistance);
    const qreal length = closestDistance.length();

    if (length > pieceGap && length <= pieceGap + extraZone)
    {
        closestDistance.setLength(length - pieceGap);
        QPointF diff = closestDistance.p2() - closestDistance.p1();
        dx = diff.x();
        dy = diff.y();
        return true;
    }

    if (length < pieceGap && length >= pieceGap - extraZone)
    {
        closestDistance.setAngle(closestDistance.angle() + 180);
        closestDistance.setLength(pieceGap - length);
        QPointF diff = closestDistance.p2() - closestDistance.p1();
        dx = diff.x();
        dy = diff.y();
        return true;
    }

    return false;
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::PathsSuperposition(const QVector<QPointF> &path1, const QVector<QPointF> &path2) -> bool
{
    const QRectF path1Rect = VLayoutPiece::BoundingRect(path1);
    const QPainterPath path1Path = VAbstractPiece::PainterPath(path1);

    const QRectF path2Rect = VLayoutPiece::BoundingRect(path2);
    const QPainterPath path2Path = VAbstractPiece::PainterPath(path2);

    if (path1Rect.intersects(path2Rect) || path2Rect.contains(path1Rect) || path1Rect.contains(path2Rect))
    {
        if (path1Path.contains(path2Path) || path2Path.contains(path1Path) || path1Path.intersects(path2Path))
        {
            return true;
        }
    }

    return false;
}

//---------------------------------------------------------------------------------------------------------------------
auto VPPiece::IsValid() const -> bool
{
    if (not IsHideMainPath() && GetContourPoints().isEmpty())
    {
        return false;
    }

    if (IsSeamAllowance() && IsSeamAllowanceBuiltIn() && GetContourPoints().isEmpty())
    {
        return false;
    }

    if (IsSeamAllowance() && not IsSeamAllowanceBuiltIn() && GetSeamAllowancePoints().isEmpty())
    {
        return false;
    }

    if (IsGrainlineEnabled() && GetGrainline().isEmpty())
    {
        return false;
    }

    return true;
}

//---------------------------------------------------------------------------------------------------------------------
quint16 VPPiece::CopyNumber() const
{
    return m_copyNumber;
}

//---------------------------------------------------------------------------------------------------------------------
void VPPiece::SetCopyNumber(quint16 newCopyNumber)
{
    m_copyNumber = qMax(static_cast<quint16>(1), newCopyNumber);
}