// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SVG <clipPath> implementation
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Jon A. Cruz <jon@joncruz.org>
 *   Abhishek Sharma
 *
 * Copyright (C) 2001-2002 authors
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */

#include <cstring>
#include <string>

#include "xml/repr.h"

#include "enums.h"
#include "attributes.h"
#include "document.h"
#include "style.h"

#include <2geom/transforms.h>

#include "sp-clippath.h"
#include "sp-item.h"
#include "sp-defs.h"

static SPClipPathView*      sp_clippath_view_new_prepend(SPClipPathView *list, unsigned int key, Inkscape::DrawingItem *arenaitem);
static SPClipPathView*      sp_clippath_view_list_remove(SPClipPathView *list, SPClipPathView *view);

SPClipPath::SPClipPath() : SPObjectGroup() {
    this->clipPathUnits_set = FALSE;
    this->clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;

    this->display = nullptr;
}

SPClipPath::~SPClipPath() = default;

void SPClipPath::build(SPDocument* doc, Inkscape::XML::Node* repr) {
    SPObjectGroup::build(doc, repr);

    this->readAttr( "style" );
    this->readAttr( "clipPathUnits" );

    /* Register ourselves */
    doc->addResource("clipPath", this);
}

void SPClipPath::release() {
    if (this->document) {
        // Unregister ourselves
        this->document->removeResource("clipPath", this);
    }

    while (this->display) {
        /* We simply unref and let item manage this in handler */
        this->display = sp_clippath_view_list_remove(this->display, this->display);
    }

    SPObjectGroup::release();
}

void SPClipPath::set(SPAttributeEnum key, const gchar* value) {
    switch (key) {
        case SP_ATTR_CLIPPATHUNITS:
            this->clipPathUnits = SP_CONTENT_UNITS_USERSPACEONUSE;
            this->clipPathUnits_set = FALSE;
            
            if (value) {
                if (!strcmp(value, "userSpaceOnUse")) {
                    this->clipPathUnits_set = TRUE;
                } else if (!strcmp(value, "objectBoundingBox")) {
                    this->clipPathUnits = SP_CONTENT_UNITS_OBJECTBOUNDINGBOX;
                    this->clipPathUnits_set = TRUE;
                }
            }
            
            this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
            break;
        default:
            if (SP_ATTRIBUTE_IS_CSS(key)) {
                this->style->clear(key);
                this->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
            } else {
                SPObjectGroup::set(key, value);
            }
            break;
    }
}

void SPClipPath::child_added(Inkscape::XML::Node* child, Inkscape::XML::Node* ref) {
    /* Invoke SPObjectGroup implementation */
	SPObjectGroup::child_added(child, ref);

    /* Show new object */
    SPObject *ochild = this->document->getObjectByRepr(child);

    if (SP_IS_ITEM(ochild)) {
        for (SPClipPathView *v = this->display; v != nullptr; v = v->next) {
            Inkscape::DrawingItem *ac = SP_ITEM(ochild)->invoke_show(v->arenaitem->drawing(), v->key, SP_ITEM_REFERENCE_FLAGS);

            if (ac) {
                v->arenaitem->prependChild(ac);
            }
        }
    }
}

void SPClipPath::update(SPCtx* ctx, unsigned int flags) {
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }

    flags &= SP_OBJECT_MODIFIED_CASCADE;

    std::vector<SPObject *> l;
    for (auto& child: children) {
        sp_object_ref(&child);
        l.push_back(&child);
    }

    for (auto child:l) {
        if (flags || (child->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->updateDisplay(ctx, flags);
        }

        sp_object_unref(child);
    }

    for (SPClipPathView *v = this->display; v != nullptr; v = v->next) {
        Inkscape::DrawingGroup *g = dynamic_cast<Inkscape::DrawingGroup *>(v->arenaitem);

        if (this->clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && v->bbox) {
            Geom::Affine t = Geom::Scale(v->bbox->dimensions());
            t.setTranslation(v->bbox->min());
            g->setChildTransform(t);
        } else {
            g->setChildTransform(Geom::identity());
        }
    }
}

void SPClipPath::modified(unsigned int flags) {
    if (flags & SP_OBJECT_MODIFIED_FLAG) {
        flags |= SP_OBJECT_PARENT_MODIFIED_FLAG;
    }

    flags &= SP_OBJECT_MODIFIED_CASCADE;

    std::vector<SPObject *> l;
    for (auto& child: children) {
        sp_object_ref(&child);
        l.push_back(&child);
    }

    for (auto child:l) {
        if (flags || (child->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))) {
            child->emitModified(flags);
        }
        sp_object_unref(child);
    }
}

Inkscape::XML::Node* SPClipPath::write(Inkscape::XML::Document* xml_doc, Inkscape::XML::Node* repr, guint flags) {
    if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
        repr = xml_doc->createElement("svg:clipPath");
    }

    SPObjectGroup::write(xml_doc, repr, flags);

    return repr;
}

Inkscape::DrawingItem *SPClipPath::show(Inkscape::Drawing &drawing, unsigned int key) {
    Inkscape::DrawingGroup *ai = new Inkscape::DrawingGroup(drawing);
    display = sp_clippath_view_new_prepend(display, key, ai);

    for (auto& child: children) {
        if (SP_IS_ITEM(&child)) {
            Inkscape::DrawingItem *ac = SP_ITEM(&child)->invoke_show(drawing, key, SP_ITEM_REFERENCE_FLAGS);

            if (ac) {
                /* The order is not important in clippath */
                ai->appendChild(ac);
            }
        }
    }

    if (clipPathUnits == SP_CONTENT_UNITS_OBJECTBOUNDINGBOX && display->bbox) {
        Geom::Affine t = Geom::Scale(display->bbox->dimensions());
        t.setTranslation(display->bbox->min());
        ai->setChildTransform(t);
    }

    ai->setStyle(this->style);

    return ai;
}

void SPClipPath::hide(unsigned int key) {
    for (auto& child: children) {
        if (SP_IS_ITEM(&child)) {
            SP_ITEM(&child)->invoke_hide(key);
        }
    }
    for (SPClipPathView *v = display; v != nullptr; v = v->next) {
        if (v->key == key) {
            /* We simply unref and let item to manage this in handler */
            display = sp_clippath_view_list_remove(display, v);
            return;
        }
    }
}

void SPClipPath::setBBox(unsigned int key, Geom::OptRect const &bbox) {
    for (SPClipPathView *v = display; v != nullptr; v = v->next) {
        if (v->key == key) {
            v->bbox = bbox;
            break;
        }
    }
}

Geom::OptRect SPClipPath::geometricBounds(Geom::Affine const &transform) {
    Geom::OptRect bbox;
    for (auto& i: children) {
        if (SP_IS_ITEM(&i)) {
            Geom::OptRect tmp = SP_ITEM(&i)->geometricBounds(SP_ITEM(&i)->transform * transform);
            bbox.unionWith(tmp);
        }
    }
    return bbox;
}

/* ClipPath views */

SPClipPathView *
sp_clippath_view_new_prepend(SPClipPathView *list, unsigned int key, Inkscape::DrawingItem *arenaitem)
{
    SPClipPathView *new_path_view = g_new(SPClipPathView, 1);

    new_path_view->next = list;
    new_path_view->key = key;
    new_path_view->arenaitem = arenaitem;
    new_path_view->bbox = Geom::OptRect();

    return new_path_view;
}

SPClipPathView *
sp_clippath_view_list_remove(SPClipPathView *list, SPClipPathView *view)
{
    if (view == list) {
        list = list->next;
    } else {
        SPClipPathView *prev;
        prev = list;
        while (prev->next != view) prev = prev->next;
        prev->next = view->next;
    }

    delete view->arenaitem;
    g_free(view);

    return list;
}

// Create a mask element (using passed elements), add it to <defs>
const gchar *SPClipPath::create (std::vector<Inkscape::XML::Node*> &reprs, SPDocument *document)
{
    Inkscape::XML::Node *defsrepr = document->getDefs()->getRepr();

    Inkscape::XML::Document *xml_doc = document->getReprDoc();
    Inkscape::XML::Node *repr = xml_doc->createElement("svg:clipPath");
    repr->setAttribute("clipPathUnits", "userSpaceOnUse");

    defsrepr->appendChild(repr);
    const gchar *id = repr->attribute("id");
    SPObject *clip_path_object = document->getObjectById(id);

    for (auto node : reprs) {
        clip_path_object->appendChildRepr(node);
    }

    Inkscape::GC::release(repr);
    return id;
}

/*
  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 :
