#include "Catalogue/CatalogueSideBarWidget.h"
#include "ui_CatalogueSideBarWidget.h"

constexpr auto ALL_EVENT_ITEM_TYPE = QTreeWidgetItem::UserType;
constexpr auto TRASH_ITEM_TYPE = QTreeWidgetItem::UserType + 1;
constexpr auto CATALOGUE_ITEM_TYPE = QTreeWidgetItem::UserType + 2;
constexpr auto DATABASE_ITEM_TYPE = QTreeWidgetItem::UserType + 3;


struct CatalogueSideBarWidget::CatalogueSideBarWidgetPrivate {
    void configureTreeWidget(QTreeWidget *treeWidget);
    QTreeWidgetItem *addDatabaseItem(const QString &name, QTreeWidget *treeWidget);
    void addCatalogueItem(const QString &name, QTreeWidgetItem *parentDatabaseItem);
};

CatalogueSideBarWidget::CatalogueSideBarWidget(QWidget *parent)
        : QWidget(parent),
          ui(new Ui::CatalogueSideBarWidget),
          impl{spimpl::make_unique_impl<CatalogueSideBarWidgetPrivate>()}
{
    ui->setupUi(this);
    impl->configureTreeWidget(ui->treeWidget);

    auto emitSelection = [this](auto item) {
        switch (item->type()) {
            case CATALOGUE_ITEM_TYPE:
                emit this->catalogueSelected(item->text(0));
                break;
            case ALL_EVENT_ITEM_TYPE:
                emit this->allEventsSelected();
                break;
            case TRASH_ITEM_TYPE:
                emit this->trashSelected();
                break;
            case DATABASE_ITEM_TYPE:
            default:
                break;
        }
    };

    connect(ui->treeWidget, &QTreeWidget::itemClicked, emitSelection);
    connect(ui->treeWidget, &QTreeWidget::currentItemChanged, emitSelection);
}

CatalogueSideBarWidget::~CatalogueSideBarWidget()
{
    delete ui;
}

void CatalogueSideBarWidget::CatalogueSideBarWidgetPrivate::configureTreeWidget(
    QTreeWidget *treeWidget)
{
    auto allEventsItem = new QTreeWidgetItem({"All Events"}, ALL_EVENT_ITEM_TYPE);
    allEventsItem->setIcon(0, QIcon(":/icones/allEvents.png"));
    treeWidget->addTopLevelItem(allEventsItem);

    auto trashItem = new QTreeWidgetItem({"Trash"}, TRASH_ITEM_TYPE);
    trashItem->setIcon(0, QIcon(":/icones/trash.png"));
    treeWidget->addTopLevelItem(trashItem);

    auto separator = new QFrame(treeWidget);
    separator->setFrameShape(QFrame::HLine);

    auto separatorItem = new QTreeWidgetItem();
    separatorItem->setFlags(Qt::NoItemFlags);
    treeWidget->addTopLevelItem(separatorItem);
    treeWidget->setItemWidget(separatorItem, 0, separator);

    // Test
    auto db = addDatabaseItem("Database 1", treeWidget);
    addCatalogueItem("Catalogue 1", db);
    addCatalogueItem("Catalogue 2", db);
    addCatalogueItem("Catalogue 3", db);
    addCatalogueItem("Catalogue 4", db);

    auto db2 = addDatabaseItem("Database 2", treeWidget);
    addCatalogueItem("Catalogue A", db2);
    addCatalogueItem("Catalogue B", db2);
    addCatalogueItem("Catalogue C", db2);

    treeWidget->expandAll();
}

QTreeWidgetItem *
CatalogueSideBarWidget::CatalogueSideBarWidgetPrivate::addDatabaseItem(const QString &name,
                                                                       QTreeWidget *treeWidget)
{
    auto databaseItem = new QTreeWidgetItem({name}, DATABASE_ITEM_TYPE);
    databaseItem->setIcon(0, QIcon(":/icones/database.png"));
    treeWidget->addTopLevelItem(databaseItem);

    return databaseItem;
}

void CatalogueSideBarWidget::CatalogueSideBarWidgetPrivate::addCatalogueItem(
    const QString &name, QTreeWidgetItem *parentDatabaseItem)
{
    auto catalogueItem = new QTreeWidgetItem({name}, CATALOGUE_ITEM_TYPE);
    catalogueItem->setIcon(0, QIcon(":/icones/catalogue.png"));
    parentDatabaseItem->addChild(catalogueItem);
}