#include "page_manager.h"

void PageManager::push(AppState& state, std::unique_ptr<Page> page)
{
    if (!stack_.empty()) {
        stack_.back()->onPause(state);
    }
    stack_.push_back(std::move(page));
    stack_.back()->onPush(state);
}

void PageManager::pop(AppState& state)
{
    if (stack_.empty()) return;

    stack_.back()->onPop(state);
    stack_.pop_back();

    if (!stack_.empty()) {
        stack_.back()->onResume(state);
    }
}

void PageManager::popToRoot(AppState& state)
{
    while (stack_.size() > 1) {
        stack_.back()->onPop(state);
        stack_.pop_back();
    }
    if (!stack_.empty()) {
        stack_.back()->onResume(state);
    }
}

void PageManager::replace(AppState& state, std::unique_ptr<Page> page)
{
    if (!stack_.empty()) {
        stack_.back()->onPop(state);
        stack_.pop_back();
    }
    stack_.push_back(std::move(page));
    stack_.back()->onPush(state);
}

Page* PageManager::current() const
{
    return stack_.empty() ? nullptr : stack_.back().get();
}

std::size_t PageManager::depth() const
{
    return stack_.size();
}

void PageManager::handleEvent(const SDL_Event& event)
{
    if (!stack_.empty()) {
        stack_.back()->handleEvent(event);
    }
}

void PageManager::update(float dt)
{
    if (!stack_.empty()) {
        stack_.back()->update(dt);
    }
}

void PageManager::render(SDL_Renderer* renderer)
{
    if (!stack_.empty()) {
        stack_.back()->render(renderer);
    }
}