#include "qw_inventorymanager.h"
#include "qw_globalmetadata.h"
#include "view/controls/sceneinventorypanel.h"
#include "view/qw_scene.h"
#include "models/qw_trigger.h"

QWInventoryManager::QWInventoryManager(QWScene *sc) :
    ptr_scene(sc),
    index_freepan(0)
{
    // Loading metadata
    metadata.length_wall = QWGlobalMetadata::valueBy("InventoryManager:length_wall").toInt();
    metadata.length_cell = QWGlobalMetadata::valueBy("InventoryManager:length_cell").toInt();
    metadata.max_amount  = QWGlobalMetadata::valueBy("InventoryManager:max_amount").toInt();
    metadata.first_wall  = QWGlobalMetadata::valueBy("InventoryManager:first_wall").toInt();
    metadata.clr_sel     = Qt::GlobalColor(QWGlobalMetadata::valueBy("InventoryManager:clr_sel").toInt());
    metadata.clr_sth     = QWGlobalMetadata::valueBy("InventoryManager:clr_str").toReal();

    item_selected_effect = new QGraphicsColorizeEffect();
    item_selected_effect->setColor(metadata.clr_sel);
    item_selected_effect->setStrength(metadata.clr_sth);

}

void QWInventoryManager::setInventoryPanel(const std::shared_ptr<QGraphicsWidget> &panel) noexcept
{
    ptr_panel = panel;
}

int QWInventoryManager::freePanel() const noexcept
{
    return index_freepan;
}

void QWInventoryManager::freePanelToRight()
{
    ++index_freepan;
    Q_ASSERT(index_freepan <= metadata.max_amount);
}

void QWInventoryManager::freePanelToLeft()
{
    --index_freepan;
    Q_ASSERT(index_freepan >= 0);
}

void QWInventoryManager::addInventoryIcon(std::shared_ptr<QWTrigger> &inventory_icon)
{
    inventory_icon->setParentItem(ptr_panel.get());
    list_inventory_icons.append(inventory_icon);
    inventory_icon->setPos(metadata.first_wall
                           + ((metadata.length_wall + metadata.length_cell)
                           * freePanel())
                           , 0);
    freePanelToRight();
}

void QWInventoryManager::removeInventoryIcon(std::shared_ptr<QWTrigger> &inventory_icon)
{
    Index panel = metadata.max_amount + 1;
    for (Index i = 0; i < list_inventory_icons.size(); ++i)
        if (inventory_icon == list_inventory_icons[i])
            panel = i;

    Q_ASSERT(panel <= metadata.max_amount);
    ptr_scene->removeItem(inventory_icon.get());
    list_inventory_icons.removeAt(panel);
    freePanelToLeft();
    reorganizeItems(panel);
}

void QWInventoryManager::reorganizeItems(Index free_panel)
{
    // When we remove item from the center we also should carefully move all the right items to the left
    for (Index j = free_panel; j < list_inventory_icons.size(); ++j)
    {
        const std::shared_ptr<QWTrigger> &t = list_inventory_icons.at(j);
        t->moveBy(-(metadata.length_cell + metadata.length_wall), 0);

        if (j > 0)
            list_inventory_icons[j-1] = list_inventory_icons[j];
    }
}

void QWInventoryManager::onClicked()
{
    for (auto &tr : list_inventory_icons)
        if (tr->isUnderMouse()) {
            tr->setGraphicsEffect(tr->graphicsEffect() ? nullptr : item_selected_effect);
            tr->activate();
        } else {
            tr->setGraphicsEffect(nullptr);
        }
}