#include "component_display.h"
#include "schema_display.h"

#include <QDrag>
#include <QDragEnterEvent>
#include <QMimeData>

namespace display {

Schema::Schema()
{
    this->selectedBrush.setColor(QColor::fromRgb(20,20,125));
    this->selectedPen.setColor(QColor::fromRgb(20, 20, 125));

    this->setScene(&scene);
    this->setAcceptDrops(true);
}


void Schema::setSchema(domain::Schema* _schema, domain::Library* _library)
{
    components.clear();
    buses.clear();

    scene.clear();
    busConnections.clear();
    this->schema = _schema;
    this->library = _library;
    if(schema != nullptr) {
        for(auto &instance: schema->componentInstances) {
            auto group = new display::ComponentGroup(instance);
            for(auto pin: group->getPins()) {
                display::Pin* p = pin;
                domain::ConnectionComponent connection{instance->name, p->getPin().getName()};
                pins.insert(std::make_pair(connection, p));
            }
            components.insert(std::make_pair(instance->name, group));
            scene.addItem(group);
        }
        for(auto &instance: schema->busInstances) {
            if(instance->bus.getDisplayBus().has_value()) {
                auto group = new display::BusGroup(instance);
                buses.insert(std::make_pair(instance->name, group));
                scene.addItem(group);
            }
        }
        for(auto &connection: schema->connections) {
            auto busInstance = dynamic_cast<domain::BusConnectionInstance*>(connection.get());
            if(busInstance != nullptr) {
                auto con = new display::BusConnection(busInstance, components[busInstance->instance->name], buses[busInstance->bus->name]);
                busConnections.push_back(con);
                scene.addItem(con);
            }
            auto directInstance = dynamic_cast<domain::DirectConnectionInstance*>(connection.get());
            if(directInstance != nullptr) {
                auto con = new display::DirectConnection(directInstance, components[directInstance->instance->name], components[directInstance->secondInstance->name]);
                directConnections.push_back(con);
                scene.addItem(con);
            }
        }
    }
}

void Schema::updateConnections() {
    if(schema != nullptr) {
        for(auto conn: busConnections) {
            conn->updateConnection();
        }
        for(auto conn: directConnections) {
            conn->updateConnection();
        }
    }
}

    void Schema::dragEnterEvent(QDragEnterEvent *event) {
        if(event->mimeData()->hasFormat("comdel/component") ||
           event->mimeData()->hasFormat("comdel/bus")) {
            event->acceptProposedAction();
        }
    }

    void Schema::dropEvent(QDropEvent *event) {
        if(event->mimeData()->hasFormat("comdel/component")) {
            auto component = library->getComponent(event->mimeData()->data("comdel/component").toStdString());

            auto attributes = std::vector<domain::InstanceAttribute>();
            for(auto attr: component.getAttributes()) {
                attributes.emplace_back(attr.getName(), attr.getDefault(), attr);
            }

            auto currentPos = this->mapToScene(event->pos());

            auto instance = std::make_shared<domain::ComponentInstance>(component.getInstanceName(), attributes, std::make_pair(currentPos.x(), currentPos.y()), component);
            schema->componentInstances.push_back(instance);

            auto group = new display::ComponentGroup(instance);
            scene.addItem(group);
            for(auto pin: group->getPins()) {
                display::Pin* p = pin;
                domain::ConnectionComponent connection{instance->name, p->getPin().getName()};
                pins.insert(std::make_pair(connection, p));
            }

            components[instance->name] = group;

            event->acceptProposedAction();
        }
        if(event->mimeData()->hasFormat("comdel/bus")) {
            auto bus = library->getBus(event->mimeData()->data("comdel/bus").toStdString());

            auto currentPos = this->mapToScene(event->pos());

            auto instance = std::make_shared<domain::BusInstance>(bus.getName(), std::make_pair(currentPos.x(), currentPos.y()), bus);
            schema->busInstances.push_back(instance);

            auto group = new display::BusGroup(instance);
            scene.addItem(group);
            buses[instance->name] = group;

            event->acceptProposedAction();
        }
    }

    void Schema::dragMoveEvent(QDragMoveEvent *event) {
        event->acceptProposedAction();
    }

    void Schema::removeConnectable(QPointF endPoint) {
        auto instance = context.pin->getComponentInstance();
        auto& pin = context.pin->getPin();

        auto busInstances = getAvailableConnectionBusses(instance, pin);

        for(auto &bus: busInstances) {
            auto rect = buses[bus->name]->boundingRect();
            rect = QRectF(buses[bus->name]->x(), buses[bus->name]->y(), rect.width(), rect.height());

            if(rect.contains(endPoint)) {
                auto con = library->getConnection({instance->component.getName(), pin.getName()}, bus->bus.getName());
                if(con.has_value()) {
                    std::vector<domain::InstanceAttribute> attributes;
                    for(auto attr: con->getAttributes()) {
                        attributes.emplace_back(attr.getName(), attr.getDefault(), attr);
                    }

                    auto conInstance = std::make_shared<domain::BusConnectionInstance>(instance, attributes, bus, *con);
                    schema->connections.push_back(conInstance);

                    if (conInstance != nullptr) {
                        auto c = new display::BusConnection(conInstance.get(), components[conInstance->instance->name],
                                                              buses[conInstance->bus->name]);
                        busConnections.push_back(c);
                        scene.addItem(c);
                    }
                    break;
                }
            }
        }

        auto pinInstances = getAvailableConnectionPins(instance, pin);

        for(auto &pinInstance: pinInstances) {
            auto rect = pins[pinInstance]->boundingRect();
            rect.setX(pins[pinInstance]->scenePos().x());
            rect.setY(pins[pinInstance]->scenePos().y());

            if(rect.contains(endPoint)) {
                auto name = components[pinInstance.component]->getComponentInstance()->component.getName();
                auto con = library->getConnection({instance->component.getName(), pin.getName()}, {name, pinInstance.pin});
                if(con.has_value()) {
                    auto bus = library->getBus(con->getBus());
                    auto busInstance = std::make_shared<domain::BusInstance>(bus.getName(), bus);
                    schema->busInstances.push_back(busInstance);

                    std::vector<domain::InstanceAttribute> attributes;
                    for(auto attr: con->getAttributes()) {
                        attributes.emplace_back(attr.getName(), attr.getDefault(), attr);
                    }

                    auto conInstance = std::make_shared<domain::DirectConnectionInstance>(instance, components[pinInstance.component]->getComponentInstance().get(), attributes, busInstance.get(), *con);
                    schema->connections.push_back(conInstance);

                    if (conInstance != nullptr) {
                        auto c = new display::DirectConnection(conInstance.get(), components[conInstance->instance->name], components[conInstance->secondInstance->name]);
                        directConnections.push_back(c);
                        scene.addItem(c);
                    }
                    break;
                }
            }
        }

        updateConnections();


        for(auto& item: this->context.selectable) {
            this->scene.removeItem(item);
            delete item;
        }
        this->context.selectable.clear();
    }

    void Schema::showConnectable(Pin *domainPin) {
        auto& pin = domainPin->getPin();

        auto busInstances = getAvailableConnectionBusses(domainPin->getComponentInstance(), domainPin->getPin());

        for(auto bus: busInstances) {
            auto& group = buses[bus->name];
            auto rect = new QGraphicsRectItem(group->boundingRect());
            rect->setPen(selectedPen);
            rect->setPos(group->scenePos());

            auto _rect = rect->rect();
            _rect.setWidth(_rect.width() + 1);
            _rect.setHeight(_rect.height() + 1);
            rect->setRect(_rect);

            context.selectable.push_back(rect);
            scene.addItem(rect);
        }

        std::vector<domain::ConnectionComponent> pinInstances = getAvailableConnectionPins(domainPin->getComponentInstance(), domainPin->getPin());

        for(auto& pinInstance: pinInstances) {
            auto& instance = pins[pinInstance];
            auto rect = new QGraphicsRectItem(instance->boundingRect());
            rect->setPen(selectedPen);
            rect->setPos(instance->scenePos());

            auto _rect = rect->rect();
            _rect.setWidth(_rect.width() + 1);
            _rect.setHeight(_rect.height() + 1);
            rect->setRect(_rect);

            context.selectable.push_back(rect);
            scene.addItem(rect);
        }

    }

    std::vector<domain::BusInstance*> Schema::getAvailableConnectionBusses(domain::ComponentInstance *instance, domain::Pin &pin) {
        std::vector<domain::BusInstance*> instances;
        for(const auto& bus: schema->busInstances) {
            if(library->hasConnection(domain::ConnectionComponent{instance->component.getName(), pin.getName()}, bus->bus.getName())) {
                instances.push_back(bus.get());
            }
        }
        return instances;
    }

    std::vector<domain::ConnectionComponent> Schema::getAvailableConnectionPins(domain::ComponentInstance *instance, domain::Pin &pin) {
        std::vector<domain::ConnectionComponent> instances;
        domain::ConnectionComponent source{instance->component.getName(), pin.getName()};
        for(const auto& entry: pins) {
            std::string name = components[entry.first.component]->getComponentInstance()->component.getName();
            if(library->hasConnection(source, domain::ConnectionComponent{name, entry.first.pin})) {
                instances.push_back(entry.first);
            }
        }
        return instances;
    }

} // namespace display