// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Container for SPKnot visual handles.
 *
 * Authors:
 *   Mitsuru Oka <oka326@parkcity.ne.jp>
 *   bulia byak <buliabyak@users.sf.net>
 *   Maximilian Albert <maximilian.albert@gmail.com>
 *   Abhishek Sharma
 *   Jon A. Cruz <jon@joncruz.org>
 *
 * Copyright (C) 2001-2008 authors
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */

#include "knot-holder.h"

#include "desktop.h"
#include "document-undo.h"
#include "document.h"
#include "knot-holder-entity.h"
#include "knot.h"

#include "live_effects/effect.h"
#include "live_effects/lpeobject.h"

#include "object/box3d.h"
#include "object/sp-ellipse.h"
#include "object/sp-hatch.h"
#include "object/sp-offset.h"
#include "object/sp-pattern.h"
#include "object/sp-rect.h"
#include "object/sp-shape.h"
#include "object/sp-spiral.h"
#include "object/sp-star.h"
#include "object/sp-marker.h"
#include "style.h"

#include "ui/icon-names.h"
#include "ui/shape-editor.h"
#include "ui/tools/arc-tool.h"
#include "ui/tools/node-tool.h"
#include "ui/tools/rect-tool.h"
#include "ui/tools/spiral-tool.h"
#include "ui/tools/tweak-tool.h"

#include "display/control/snap-indicator.h"

// TODO due to internal breakage in glibmm headers, this must be last:
#include <glibmm/i18n.h>

using Inkscape::DocumentUndo;

class SPDesktop;

KnotHolder::KnotHolder(SPDesktop *desktop, SPItem *item, SPKnotHolderReleasedFunc relhandler) :
    desktop(desktop),
    item(item),
    //XML Tree being used directly for item->getRepr() while it shouldn't be...
    repr(item ? item->getRepr() : nullptr),
    entity(),
    released(relhandler),
    local_change(FALSE),
    dragging(false),
    _edit_transform(Geom::identity())
{
    if (!desktop || !item) {
        g_print ("Error! Throw an exception, please!\n");
    }

    sp_object_ref(item);
}

KnotHolder::~KnotHolder() {
    sp_object_unref(item);

    for (auto & i : entity) {
        delete i;
    }
    entity.clear(); // is this necessary?
}

void
KnotHolder::setEditTransform(Geom::Affine edit_transform)
{
    _edit_transform = edit_transform;
}

void KnotHolder::update_knots()
{
    for (auto e = entity.begin(); e != entity.end(); ) {
        // check if pattern was removed without deleting the knot
        if ((*e)->knot_missing()) {
            delete (*e);
            e = entity.erase(e);
        } else {
            (*e)->update_knot();
            ++e;
        }
    }
}

/**
 * Returns true if at least one of the KnotHolderEntities has the mouse hovering above it.
 */
bool KnotHolder::knot_mouseover() const {
    for (auto i : entity) {
        const SPKnot *knot = i->knot;

        if (knot && knot->is_mouseover()) {
            return true;
        }
    }

    return false;
}

/**
 * Returns true if at least one of the KnotHolderEntities is selected
 */
bool KnotHolder::knot_selected() const {
    for (auto i : entity) {
        const SPKnot *knot = i->knot;

        if (knot && knot->is_selected()) {
            return true;
        }
    }
    return false;
}

void
KnotHolder::knot_mousedown_handler(SPKnot *knot, guint state)
{
    if (!(state & GDK_SHIFT_MASK)) {
        unselect_knots();
    }
    for(auto e : this->entity) {
        if (!(state & GDK_SHIFT_MASK)) {
            e->knot->selectKnot(false);
        }
        if (e->knot == knot) {
            if (!(e->knot->is_selected()) || !(state & GDK_SHIFT_MASK)){
                e->knot->selectKnot(true);
            } else {
                e->knot->selectKnot(false);
            }
        }
    }
}

void
KnotHolder::knot_clicked_handler(SPKnot *knot, guint state)
{
    SPItem *saved_item = this->item;

    for(auto e : this->entity) {
        if (e->knot == knot)
            // no need to test whether knot_click exists since it's virtual now
            e->knot_click(state);
    }

    {
        SPShape *savedShape = dynamic_cast<SPShape *>(saved_item);
        if (savedShape) {
            savedShape->set_shape();
        }
    }

    this->update_knots();

    Glib::ustring icon_name;

    // TODO extract duplicated blocks;
    if (dynamic_cast<SPRect *>(saved_item)) {
        icon_name = INKSCAPE_ICON("draw-rectangle");
    } else if (dynamic_cast<SPBox3D *>(saved_item)) {
        icon_name = INKSCAPE_ICON("draw-cuboid");
    } else if (dynamic_cast<SPGenericEllipse *>(saved_item)) {
        icon_name = INKSCAPE_ICON("draw-ellipse");
    } else if (dynamic_cast<SPStar *>(saved_item)) {
        icon_name = INKSCAPE_ICON("draw-polygon-star");
    } else if (dynamic_cast<SPSpiral *>(saved_item)) {
        icon_name = INKSCAPE_ICON("draw-spiral");
    } else if (dynamic_cast<SPMarker *>(saved_item)) {
        icon_name = INKSCAPE_ICON("tool-pointer");
    } else {
        SPOffset *offset = dynamic_cast<SPOffset *>(saved_item);
        if (offset) {
            if (offset->sourceHref) {
                icon_name = INKSCAPE_ICON("path-offset-linked");
            } else {
                icon_name = INKSCAPE_ICON("path-offset-dynamic");
            }
        }
    }

    // for drag, this is done by ungrabbed_handler, but for click we must do it here

    if (saved_item) { //increasingly aggressive sanity checks
       if (saved_item->document) {
           DocumentUndo::done(saved_item->document, _("Change handle"), icon_name);
       }
    } // else { abort(); }
}

void
KnotHolder::transform_selected(Geom::Affine transform){
    for (auto & i : entity) {
        SPKnot *knot = i->knot;
        if (knot->is_selected()) {
            knot_moved_handler(knot, knot->pos * transform , 0);
            knot->selectKnot(true);
        }
    }
}

void
KnotHolder::unselect_knots(){
    Inkscape::UI::Tools::NodeTool *nt = dynamic_cast<Inkscape::UI::Tools::NodeTool*>(desktop->event_context);
    if (nt) {
        for (auto &_shape_editor : nt->_shape_editors) {
            Inkscape::UI::ShapeEditor *shape_editor = _shape_editor.second.get();
            if (shape_editor && shape_editor->has_knotholder()) {
                KnotHolder * knotholder = shape_editor->knotholder;
                if (knotholder) {
                    for (auto e : knotholder->entity) {
                        if (e->knot->is_selected()) {
                            e->knot->selectKnot(false);
                        }
                    }
                }
            }
        }
    }
}

void
KnotHolder::knot_moved_handler(SPKnot *knot, Geom::Point const &p, guint state)
{
    if (this->dragging == false) {
    	this->dragging = true;
    }

    // this was a local change and the knotholder does not need to be recreated:
    this->local_change = TRUE;

    for(auto e : this->entity) {
        if (e->knot == knot) {
            Geom::Point const q = p * item->i2dt_affine().inverse() * _edit_transform.inverse();
            e->knot_set(q, e->knot->drag_origin * item->i2dt_affine().inverse() * _edit_transform.inverse(), state);
            break;
        }
    }

    SPShape *shape = dynamic_cast<SPShape *>(item);
    if (shape) {
        shape->set_shape();
    }

    this->update_knots();
}

void
KnotHolder::knot_ungrabbed_handler(SPKnot *knot, guint state)
{
    this->dragging = false;
    desktop->snapindicator->remove_snaptarget();

    if (this->released) {
        this->released(this->item);
    } else {
        // if a point is dragged while not selected, it should select itself,
        // even if it was just unselected in the mousedown event handler.
        if (!(knot->is_selected())) {
            knot->selectKnot(true);
        } else {
            for(auto e : this->entity) {
                if (e->knot == knot) {
                    e->knot_ungrabbed(e->knot->position(), e->knot->drag_origin * item->i2dt_affine().inverse() * _edit_transform.inverse(), state);
                    break;
                }
            }
        }

        SPObject *object = (SPObject *) this->item;

        // Caution: this call involves a screen update, which may process events, and as a
        // result the knotholder may be destructed. So, after the updateRepr, we cannot use any
        // fields of this knotholder (such as this->item), but only values we have saved beforehand
        // (such as object).
        object->updateRepr();

        /* do cleanup tasks (e.g., for LPE items write the parameter values
         * that were changed by dragging the handle to SVG)
         */
        SPLPEItem *lpeItem = dynamic_cast<SPLPEItem *>(object);
        if (lpeItem) {
            // This writes all parameters to SVG. Is this sufficiently efficient or should we only
            // write the ones that were changed?
            Inkscape::LivePathEffect::Effect *lpe = lpeItem->getCurrentLPE();
            if (lpe) {
                LivePathEffectObject *lpeobj = lpe->getLPEObj();
                lpeobj->updateRepr();
            }
        }

        SPFilter *filter = (object->style) ? object->style->getFilter() : nullptr;
        if (filter) {
            filter->updateRepr();
        }

        Glib::ustring icon_name;

        // TODO extract duplicated blocks;
        if (dynamic_cast<SPRect *>(object)) {
            icon_name = INKSCAPE_ICON("draw-rectangle");
        } else if (dynamic_cast<SPBox3D *>(object)) {
            icon_name = INKSCAPE_ICON("draw-cuboid");
        } else if (dynamic_cast<SPGenericEllipse *>(object)) {
            icon_name = INKSCAPE_ICON("draw-ellipse");
        } else if (dynamic_cast<SPStar *>(object)) {
            icon_name = INKSCAPE_ICON("draw-polygon-star");
        } else if (dynamic_cast<SPSpiral *>(object)) {
            icon_name = INKSCAPE_ICON("draw-spiral");
        } else if (dynamic_cast<SPMarker *>(object)) {
            icon_name = INKSCAPE_ICON("tool-pointer");
        } else {
            SPOffset *offset = dynamic_cast<SPOffset *>(object);
            if (offset) {
                if (offset->sourceHref) {
                    icon_name = INKSCAPE_ICON("path-offset-linked");
                } else {
                    icon_name = INKSCAPE_ICON("path-offset-dynamic");
                }
            }
        }
        DocumentUndo::done(object->document, _("Move handle"), icon_name);
    }
}

void KnotHolder::add(KnotHolderEntity *e)
{
    // g_message("Adding a knot at %p", e);
    entity.push_back(e);
}

void KnotHolder::add_pattern_knotholder()
{
    if ((item->style->fill.isPaintserver()) && dynamic_cast<SPPattern *>(item->style->getFillPaintServer())) {
        PatternKnotHolderEntityXY *entity_xy = new PatternKnotHolderEntityXY(true);
        PatternKnotHolderEntityAngle *entity_angle = new PatternKnotHolderEntityAngle(true);
        PatternKnotHolderEntityScale *entity_scale = new PatternKnotHolderEntityScale(true);
        entity_xy->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Pattern:Fill:xy",
                          // TRANSLATORS: This refers to the pattern that's inside the object
                          _("<b>Move</b> the pattern fill inside the object"));

        entity_scale->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_SIZER, "Pattern:Fill:scale",
                             _("<b>Scale</b> the pattern fill; uniformly if with <b>Ctrl</b>"));

        entity_angle->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE, "Pattern:Fill:angle",
                             _("<b>Rotate</b> the pattern fill; with <b>Ctrl</b> to snap angle"));

        entity.push_back(entity_xy);
        entity.push_back(entity_angle);
        entity.push_back(entity_scale);
    }

    if ((item->style->stroke.isPaintserver()) && dynamic_cast<SPPattern *>(item->style->getStrokePaintServer())) {
        PatternKnotHolderEntityXY *entity_xy = new PatternKnotHolderEntityXY(false);
        PatternKnotHolderEntityAngle *entity_angle = new PatternKnotHolderEntityAngle(false);
        PatternKnotHolderEntityScale *entity_scale = new PatternKnotHolderEntityScale(false);
        entity_xy->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Pattern:Stroke:xy",
                          // TRANSLATORS: This refers to the pattern that's inside the object
                          _("<b>Move</b> the stroke's pattern inside the object"));

        entity_scale->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_SIZER, "Pattern:Stroke:scale",
                             _("<b>Scale</b> the stroke's pattern; uniformly if with <b>Ctrl</b>"));

        entity_angle->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE, "Pattern:Stroke:angle",
                             _("<b>Rotate</b> the stroke's pattern; with <b>Ctrl</b> to snap angle"));

        entity.push_back(entity_xy);
        entity.push_back(entity_angle);
        entity.push_back(entity_scale);
    }
}

void KnotHolder::add_hatch_knotholder()
{
    if ((item->style->fill.isPaintserver()) && dynamic_cast<SPHatch *>(item->style->getFillPaintServer())) {
        HatchKnotHolderEntityXY *entity_xy = new HatchKnotHolderEntityXY(true);
        HatchKnotHolderEntityAngle *entity_angle = new HatchKnotHolderEntityAngle(true);
        HatchKnotHolderEntityScale *entity_scale = new HatchKnotHolderEntityScale(true);
        entity_xy->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Hatch:Fill:xy",
                          // TRANSLATORS: This refers to the hatch that's inside the object
                          _("<b>Move</b> the hatch fill inside the object"));

        entity_scale->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_SIZER, "Hatch:Fill:scale",
                             _("<b>Scale</b> the hatch fill; uniformly if with <b>Ctrl</b>"));

        entity_angle->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE, "Hatch:Fill:angle",
                             _("<b>Rotate</b> the hatch fill; with <b>Ctrl</b> to snap angle"));

        entity.push_back(entity_xy);
        entity.push_back(entity_angle);
        entity.push_back(entity_scale);
    }

    if ((item->style->stroke.isPaintserver()) && dynamic_cast<SPHatch *>(item->style->getStrokePaintServer())) {
        HatchKnotHolderEntityXY *entity_xy = new HatchKnotHolderEntityXY(false);
        HatchKnotHolderEntityAngle *entity_angle = new HatchKnotHolderEntityAngle(false);
        HatchKnotHolderEntityScale *entity_scale = new HatchKnotHolderEntityScale(false);
        entity_xy->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Hatch:Stroke:xy",
                          // TRANSLATORS: This refers to the pattern that's inside the object
                          _("<b>Move</b> the hatch stroke inside the object"));

        entity_scale->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_SIZER, "Hatch:Stroke:scale",
                             _("<b>Scale</b> the hatch stroke; uniformly if with <b>Ctrl</b>"));

        entity_angle->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_ROTATE, "Hatch:Stroke:angle",
                             _("<b>Rotate</b> the hatch stroke; with <b>Ctrl</b> to snap angle"));

        entity.push_back(entity_xy);
        entity.push_back(entity_angle);
        entity.push_back(entity_scale);
    }
}

void KnotHolder::add_filter_knotholder() {
    if (!item->style->filter.set || !item->style->getFilter() || item->style->getFilter()->auto_region) {
        return;
    }

    FilterKnotHolderEntity *entity_tl = new FilterKnotHolderEntity(true);
    FilterKnotHolderEntity *entity_br = new FilterKnotHolderEntity(false);
    entity_tl->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Filter:TopLeft",
                      _("<b>Resize</b> the filter effect region"));
    entity_br->create(desktop, item, this, Inkscape::CANVAS_ITEM_CTRL_TYPE_POINT, "Filter:BottomRight",
                      _("<b>Resize</b> the filter effect region"));
    entity.push_back(entity_tl);
    entity.push_back(entity_br);
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :