#include <escher/alternate_empty_view_controller.h>
#include <escher/app.h>
#include <escher/palette.h>
#include <assert.h>

/* ContentView */

AlternateEmptyViewController::ContentView::ContentView(ViewController * mainViewController, AlternateEmptyViewDelegate * delegate) :
  m_message(PointerTextView(KDText::FontSize::Small, nullptr, 0.5f, 0.5f, KDColorBlack, Palette::WallScreen)),
  m_mainViewController(mainViewController),
  m_delegate(delegate)
{
}

int AlternateEmptyViewController::ContentView::numberOfSubviews() const {
  return 1;
}

View * AlternateEmptyViewController::ContentView::subviewAtIndex(int index) {
  assert(index == 0);
  if (m_delegate->isEmpty()) {
    m_message.setText(m_delegate->emptyMessage());
    return &m_message;
  }
  return m_mainViewController->view();
}

void AlternateEmptyViewController::ContentView::layoutSubviews() {
  if (alternateEmptyViewDelegate()->isEmpty()) {
    m_message.setFrame(bounds());
  } else {
    m_mainViewController->view()->setFrame(bounds());
  }
}

ViewController * AlternateEmptyViewController::ContentView::mainViewController() const {
  return m_mainViewController;
}

AlternateEmptyViewDelegate * AlternateEmptyViewController::ContentView::alternateEmptyViewDelegate() const {
  return m_delegate;
}

/* AlternateEmptyViewController */

AlternateEmptyViewController::AlternateEmptyViewController(Responder * parentResponder, ViewController * mainViewController, AlternateEmptyViewDelegate * delegate) :
  ViewController(parentResponder),
  m_contentView(ContentView(mainViewController, delegate))
{
}

View * AlternateEmptyViewController::view() {
  return &m_contentView;
}

const char * AlternateEmptyViewController::title() const {
  return m_contentView.mainViewController()->title();
}

bool AlternateEmptyViewController::handleEvent(Ion::Events::Event event) {
  if (m_contentView.alternateEmptyViewDelegate()->isEmpty()) {
    if (event != Ion::Events::Home) {
      app()->setFirstResponder(m_contentView.alternateEmptyViewDelegate()->defaultController());
      return true;
    }
    return false;
  }
  return false;
}

void AlternateEmptyViewController::didBecomeFirstResponder() {
  m_contentView.layoutSubviews();
  if (!m_contentView.alternateEmptyViewDelegate()->isEmpty()) {
    app()->setFirstResponder(m_contentView.mainViewController());
  }
}