/*
 * Copyright 2009- ECMWF and INPE.
 *
 * This software is licensed under the terms of the Apache Licence version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 * In applying this licence, ECMWF does not waive the privileges and immunities
 * granted to it by virtue of its status as an intergovernmental organisation
 * nor does it submit to any jurisdiction.
 */

#include "TreeNodeWidget.hpp"

#include <QHBoxLayout>
#include <QMetaMethod>

#include "AbstractNodeModel.hpp"
#include "CompactView.hpp"
#include "DashboardDock.hpp"
#include "FilterWidget.hpp"
#include "NodePathWidget.hpp"
#include "NodeViewBase.hpp"
#include "StandardView.hpp"
#include "TreeNodeModel.hpp"
#include "TreeNodeView.hpp"
#include "UiLog.hpp"
#include "VConfig.hpp"
#include "VFilter.hpp"
#include "VModelData.hpp"
#include "VSettings.hpp"
#include "WidgetNameProvider.hpp"

AttributeFilter* TreeNodeWidget::lastAtts_ = nullptr;

TreeNodeWidget::TreeNodeWidget(ServerFilter* serverFilter, QWidget* parent)
    : NodeWidget("tree", serverFilter, parent),
      viewLayoutMode_(StandardLayoutMode),
      layoutProp_(nullptr) {
    // Init qt-creator form
    setupUi(this);

    if (!lastAtts_) {
        lastAtts_ = new AttributeFilter();
    }

    initAtts();

    // Create the breadcrumbs (it will be reparented)
    bcWidget_ = new NodePathWidget(this);

    // This defines how to filter the nodes in the tree. We only want to filter according to node status.
    filterDef_ = new NodeFilterDef(serverFilter_, NodeFilterDef::NodeStateScope);

    // Create the tree model. It uses the datahandler to access the data.
    model_ = new TreeNodeModel(serverFilter_, filterDef_, atts_, icons_, this);

    // Create the view
    auto* hb = new QHBoxLayout(viewHolder_);
    hb->setContentsMargins(0, 0, 0, 0);
    hb->setSpacing(0);

    layoutProp_ = VConfig::instance()->find("view.tree.layoutStyle");
    Q_ASSERT(layoutProp_);
    layoutProp_->addObserver(this);

    if (layoutProp_->value() == "compact") {
        viewLayoutMode_ = CompactLayoutMode;
    }

    Q_ASSERT(view_ == nullptr);
    setViewLayoutMode(viewLayoutMode_);

    connect(model_, SIGNAL(firstScanEnded(const VTreeServer*)), this, SLOT(firstScanEnded(const VTreeServer*)));

    connect(bcWidget_, SIGNAL(selected(VInfo_ptr)), this, SLOT(slotSelectionChangedInBc(VInfo_ptr)));

    connect(atts_, SIGNAL(changed()), this, SLOT(slotAttsChanged()));

    // This will not emit the trigered signal of the action!!
    // Synchronise the action and the breadcrumbs state
    actionBreadcrumbs->setChecked(bcWidget_->isGuiMode());

    // The node status filter is exposed via a menu. So we need a reference to it.
    states_ = filterDef_->nodeState();

    viewHolder_->setObjectName("h");
    WidgetNameProvider::nameChildren(this);
}

TreeNodeWidget::~TreeNodeWidget() {
    delete stateFilterMenu_;
    delete attrFilterMenu_;
    delete iconFilterMenu_;
}

void TreeNodeWidget::setViewLayoutMode(TreeNodeWidget::ViewLayoutMode mode) {
    if (view_ && viewLayoutMode_ == mode) {
        return;
    }

    viewLayoutMode_ = mode;

    if (view_) {
        QWidget* realW = view_->realWidget();
        viewHolder_->layout()->removeWidget(realW);
        delete view_;
        view_ = nullptr;
        delete realW;
        model_->getData()->deleteExpandState();
    }

    if (viewLayoutMode_ == CompactLayoutMode) {
        auto* realModel = static_cast<TreeNodeModel*>(model_);

        auto* gv = new TreeNodeView(new CompactView(realModel, this), realModel, filterDef_, this);
        viewHolder_->layout()->addWidget(gv->realWidget());
        // Store the pointer to the (non-QObject) base class of the view!!!
        view_ = gv;
    }
    else {
        auto* realModel = static_cast<TreeNodeModel*>(model_);

        auto* tv = new TreeNodeView(new StandardView(realModel, this), realModel, filterDef_, this);
        viewHolder_->layout()->addWidget(tv->realWidget());
        // Store the pointer to the (non-QObject) base class of the view!!!
        view_ = tv;
    }

    // Signals-slots
    connect(
        view_->realObject(), SIGNAL(selectionChanged(VInfo_ptr)), this, SLOT(slotSelectionChangedInView(VInfo_ptr)));

    connect(view_->realObject(),
            SIGNAL(infoPanelCommand(VInfo_ptr, QString)),
            this,
            SIGNAL(popInfoPanel(VInfo_ptr, QString)));

    connect(view_->realObject(),
            SIGNAL(dashboardCommand(VInfo_ptr, QString)),
            this,
            SIGNAL(dashboardCommand(VInfo_ptr, QString)));

    connect(model_, SIGNAL(clearBegun(const VTreeNode*)), view_->realObject(), SLOT(slotSaveExpand(const VTreeNode*)));

    connect(
        model_, SIGNAL(scanEnded(const VTreeNode*)), view_->realObject(), SLOT(slotRestoreExpand(const VTreeNode*)));

    connect(model_, SIGNAL(rerender()), view_->realObject(), SLOT(slotRerender()));

    connect(model_,
            SIGNAL(filterUpdateRemoveBegun(const VTreeNode*)),
            view_->realObject(),
            SLOT(slotSaveExpand(const VTreeNode*)));

    connect(model_,
            SIGNAL(filterUpdateAddEnded(const VTreeNode*)),
            view_->realObject(),
            SLOT(slotRestoreExpand(const VTreeNode*)));
}

void TreeNodeWidget::initAtts() {
    if (VProperty* prop = VConfig::instance()->find("view.tree.attributesPolicy")) {
        if (prop->valueAsStdString() == "last") {
            atts_->setCurrent(lastAtts_->current());
        }
        else if (VProperty* propDef = VConfig::instance()->find("view.tree.defaultAttributes")) {
            atts_->setCurrent(propDef->value().toString().split("/"));
        }
    }
}

void TreeNodeWidget::populateDockTitleBar(DashboardDockTitleWidget* tw) {
    // Builds the menu for the settings tool button
    auto* menu = new QMenu(this);
    menu->setTearOffEnabled(true);

    menu->addAction(actionBreadcrumbs);
    auto* menuState = new QMenu(this);
    auto* menuType  = new QMenu(this);
    QMenu* menuIcon = menu->addMenu(tr("Icon"));

    menuState->setTearOffEnabled(true);
    menuType->setTearOffEnabled(true);
    menuIcon->setTearOffEnabled(true);

    // stateFilterMenu_=new StateFilterMenu(menuState,filter_->menu());
    attrFilterMenu_ = new VParamFilterMenu(menuType, atts_, "Show attributes", VParamFilterMenu::ShowMode);
    iconFilterMenu_ =
        new VParamFilterMenu(menuIcon, icons_, "Show icons", VParamFilterMenu::ShowMode, VParamFilterMenu::PixmapDecor);
    stateFilterMenu_ = new VParamFilterMenu(
        menuState, states_, "Show statuses", VParamFilterMenu::ShowMode, VParamFilterMenu::ColourDecor);

    // Sets the menu on the toolbutton
    tw->optionsTb()->setMenu(menu);

    // Add the bc to the titlebar (bc will have a new parent)
    tw->setBcWidget(bcWidget_);

    QList<QAction*> acLst;

    auto* acState = new QAction(this);
    acState->setIcon(QPixmap(":viewer/status.svg"));
    acState->setToolTip("Filter by status");
    acState->setMenu(menuState);
    acLst << acState;

    auto* acAttr = new QAction(this);
    acAttr->setIcon(QPixmap(":viewer/attribute.svg"));
    acAttr->setToolTip("Show attributes");
    acAttr->setMenu(menuType);
    acLst << acAttr;

    tw->addActions(acLst);
}

void TreeNodeWidget::slotSelectionChangedInView(VInfo_ptr info) {
    updateActionState(info);
    bcWidget_->setPath(info);
    if (broadcastSelection()) {
        Q_EMIT selectionChanged(info);
    }
}

void TreeNodeWidget::on_actionBreadcrumbs_triggered(bool b) {
    if (b) {
        bcWidget_->setMode(NodePathWidget::GuiMode);
    }
    else {
        bcWidget_->setMode(NodePathWidget::TextMode);
    }
}

void TreeNodeWidget::rerender() {
    bcWidget_->rerender();
    view_->rerender();
}

bool TreeNodeWidget::initialSelectionInView() {
    // Seeting the initail selection is probably unsuccessful because at
    // this point the servers are probably not fully loaded
    VInfo_ptr selInfo = VInfo::createFromPath(firstSelectionPath_);
    if (selInfo) {
        view_->setCurrentSelection(selInfo);
    }
    else {
        view_->selectFirstServer();
    }

    return true;
}

// When the first successful scan ended we try to set the initial selection
void TreeNodeWidget::firstScanEnded(const VTreeServer* s) {
    VInfo_ptr selInfo = VInfo::createFromPath(firstSelectionPath_);
    if (selInfo && selInfo->server() == s->realServer()) {
        view_->setCurrentSelection(selInfo);
    }
}

void TreeNodeWidget::slotAttsChanged() {
    lastAtts_->setCurrent(atts_->current());
}

void TreeNodeWidget::notifyChange(VProperty* p) {
    if (p == layoutProp_) {
        if (layoutProp_->value() == "compact") {
            setViewLayoutMode(CompactLayoutMode);
        }
        else {
            setViewLayoutMode(StandardLayoutMode);
        }
    }
}

void TreeNodeWidget::writeSettings(VComboSettings* vs) {
    vs->put("type", type_);
    vs->put("dockId", id_);

    VInfo_ptr sel = currentSelection();
    if (sel) {
        vs->put("selection", sel->storedPath());
    }

    bcWidget_->writeSettings(vs);

    states_->writeSettings(vs);
    atts_->writeSettings(vs);
    icons_->writeSettings(vs);

    DashboardWidget::writeSettings(vs);
}

void TreeNodeWidget::readSettings(VComboSettings* vs) {
    auto type = vs->get<std::string>("type", "");
    if (type != type_) {
        return;
    }

    // The selection on last exit. We will use it later when the server is fully loaded.
    firstSelectionPath_ = vs->get<std::string>("selection", "");

    // This will not emit the changed signal. So the "observers" will
    // not notice the change.
    states_->readSettings(vs);
    atts_->readSettings(vs);
    icons_->readSettings(vs);

    lastAtts_->setCurrent(atts_->current());

    // The model at this point is inactive (not using its data). We make it active:
    //	-it will instruct its data provider to filter the data according
    //    to the current settings
    //	-it will load and display the data
    model_->active(true);

    //--------------------------
    // Breadcrumbs
    //--------------------------

    bcWidget_->readSettings(vs);

    // Synchronise the action and the breadcrumbs state
    // This will not emit the trigered signal of the action!!
    actionBreadcrumbs->setChecked(bcWidget_->isGuiMode());

    attrFilterMenu_->reload();
    iconFilterMenu_->reload();
    stateFilterMenu_->reload();

    DashboardWidget::readSettings(vs);
}
