#include "layerstack.h"
#include "application.h"


LayerStack::LayerStack() {

    insert = layers.begin();
}

LayerStack::~LayerStack() {

    for(Layer* layer : layers) {
        delete layer;
    }
}

void LayerStack::pushLayer(Layer* layer) {
    layers.emplace(insert, layer);
    layer->onAttach();
}

void LayerStack::pushOverlay(Layer* layer) {
    layers.emplace_back(layer);
    layer->onAttach();
}

void LayerStack::popLayer(Layer* layer) {
    auto it = find(layers.begin(), layers.end(), layer);
    if(it != layers.end()) {
        layers.erase(it);
        insert--;
    }
    layer->onDetach();
}

void LayerStack::popOverlay(Layer* layer) {
    auto it = find(layers.begin(), layers.end(), layer);
    if(it != layers.end()) {
        layers.erase(it);
    }
    layer->onDetach();
}

void LayerStack::propagateEvent(const Event* e) {
    eventHandled = false;
    if(e == nullptr)
        return;
    else {
        if(layers.size() > 0) {
            for(int i = layers.size() - 1; i >= 0; i--) {
                if(!eventHandled)
                    eventHandled = layers.at(i)->onEvent(e);
                else
                    break;
            }
        }
        delete e;
    }
}

void LayerStack::updateLayers() {
    if(layers.size() > 0) {
        for(Layer* layer : layers) {
            layer->onUpdate();
        }
    }
}

void LayerStack::shutdown() {
    if(layers.size() > 0) {
        for(Layer* layer : layers) {
            popLayer(layer);
            layer->onDetach();
            delete layer;
        }
    }   
}