// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
 * Copyright 2011 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3, as
 * published by the  Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranties of
 * MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the applicable version of the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of both the GNU Lesser General Public
 * License version 3 along with this program.  If not, see
 * <http://www.gnu.org/licenses/>
 *
 * Authored by: Gordon Allott <gord.allott@canonical.com>
 *
 */

#include "Preview.h"
#include "TabIterator.h"
#include "unity-shared/IntrospectableWrappers.h"
#include "unity-shared/CoverArt.h"
#include <NuxCore/Logger.h>
#include <Nux/HLayout.h>
#include <Nux/VLayout.h>
#include <UnityCore/PaymentPreview.h>
#include "ActionButton.h"

#include "GenericPreview.h"
#include "ApplicationPreview.h"
#include "ErrorPreview.h"
#include "MusicPreview.h"
#include "MoviePreview.h"
#include "MusicPaymentPreview.h"
#include "SocialPreview.h"
#include "PreviewInfoHintWidget.h"
#include "ActionButton.h"

namespace unity
{
namespace dash
{
namespace previews
{
DECLARE_LOGGER(logger, "unity.dash.preview.view");

previews::Preview::Ptr Preview::PreviewForModel(dash::Preview::Ptr model)
{
  if (!model)
  {
    LOG_WARN(logger) << "Unable to create Preview object";
    return previews::Preview::Ptr();
  }

  if (model->renderer_name == "preview-generic")
  {
    return Preview::Ptr(new GenericPreview(model));
  }
  else if (model->renderer_name == "preview-payment")
  {
    dash::PaymentPreview* payment_preview_model = dynamic_cast<dash::PaymentPreview*>(
      model.get());
    if (payment_preview_model->preview_type.Get() == dash::PaymentPreview::MUSIC)
    {
      return Preview::Ptr(new MusicPaymentPreview(model));
    }
    else
    {
      return Preview::Ptr(new ErrorPreview(model));
    }
  }
  else if (model->renderer_name == "preview-application")
  {
    return Preview::Ptr(new ApplicationPreview(model));
  }
  else if (model->renderer_name == "preview-music")
  {
    return Preview::Ptr(new MusicPreview(model));
  }
  else if (model->renderer_name == "preview-movie")
  {
    return Preview::Ptr(new MoviePreview(model));
  }
  else if (model->renderer_name == "preview-social")
  {
    return Preview::Ptr(new SocialPreview(model));
  }
  else
  {
    LOG_WARN(logger) << "Unable to create Preview for renderer: " << model->renderer_name.Get() << "; using generic";
  }

  return Preview::Ptr(new GenericPreview(model));
}

NUX_IMPLEMENT_OBJECT_TYPE(Preview);

Preview::Preview(dash::Preview::Ptr preview_model)
  : View(NUX_TRACKER_LOCATION)
  , scale(1.0f)
  , preview_model_(preview_model)
  , tab_iterator_(new TabIterator())
  , full_data_layout_(nullptr)
  , image_(nullptr)
  , title_(nullptr)
  , subtitle_(nullptr)
  , preview_container_(new PreviewContainer)
{
  scale.changed.connect(sigc::mem_fun(this, &Preview::UpdateScale));
}

Preview::~Preview()
{
  delete tab_iterator_;
}

std::string Preview::GetName() const
{
  return "Preview";
}

void Preview::AddProperties(debug::IntrospectionData& introspection)
{
  introspection
    .add(GetAbsoluteGeometry())
    .add("uri", preview_model_->preview_result.uri);
}

void Preview::OnActionActivated(ActionButton* button, std::string const& id)
{
  if (preview_model_)
    preview_model_->PerformAction(id);
}

nux::Layout* Preview::BuildGridActionsLayout(dash::Preview::ActionPtrList actions, std::list<nux::AbstractButton*>& buttons)
{
  previews::Style& style = dash::previews::Style::Instance();

  nux::VLayout* actions_layout_v = new nux::VLayout();
  actions_layout_v->SetSpaceBetweenChildren(style.GetSpaceBetweenActions().CP(scale));
  uint rows = actions.size() / 2 + ((actions.size() % 2 > 0) ? 1 : 0);
  uint action_iter = 0;
  for (uint i = 0; i < rows; i++)
  {
    nux::HLayout* actions_layout_h = new TabIteratorHLayout(tab_iterator_);
    actions_layout_h->SetSpaceBetweenChildren(style.GetSpaceBetweenActions().CP(scale));

    for (uint j = 0; j < 2 && action_iter < actions.size(); j++, action_iter++)
    {
        dash::Preview::ActionPtr action = actions[action_iter];

        ActionButton* button = new ActionButton(action->id, action->display_name, action->icon_hint, NUX_TRACKER_LOCATION);
        tab_iterator_->Append(button);
        AddChild(button);
        button->SetFont(style.action_font());
        button->SetExtraHint(action->extra_text, style.action_extra_font());
        button->activate.connect(sigc::mem_fun(this, &Preview::OnActionActivated));
        buttons.push_back(button);

        actions_layout_h->AddView(button, 1, nux::MINOR_POSITION_CENTER, nux::MINOR_SIZE_FULL, 100.0f, nux::NUX_LAYOUT_BEGIN);
    }

    actions_layout_v->AddLayout(actions_layout_h, 0, nux::MINOR_POSITION_END, nux::MINOR_SIZE_FULL, 100.0f, nux::NUX_LAYOUT_BEGIN);
  }

  return actions_layout_v;
}

nux::Layout* Preview::BuildVerticalActionsLayout(dash::Preview::ActionPtrList actions, std::list<nux::AbstractButton*>& buttons)
{
  previews::Style& style = dash::previews::Style::Instance();

  nux::VLayout* actions_layout_v = new TabIteratorVLayout(tab_iterator_);
  actions_layout_v->SetSpaceBetweenChildren(style.GetSpaceBetweenActions().CP(scale));

  uint action_iter = 0;
  for (uint i = 0; i < actions.size(); i++)
  {
      dash::Preview::ActionPtr action = actions[action_iter++];

      ActionButton* button = new ActionButton(action->id, action->display_name, action->icon_hint, NUX_TRACKER_LOCATION);
      tab_iterator_->Append(button);
      AddChild(button);
      button->SetFont(style.action_font());
      button->SetExtraHint(action->extra_text, style.action_extra_font());
      button->activate.connect(sigc::mem_fun(this, &Preview::OnActionActivated));
      buttons.push_back(button);

      actions_layout_v->AddView(button, 0, nux::MINOR_POSITION_CENTER, nux::MINOR_SIZE_FULL, 100.0f, nux::NUX_LAYOUT_BEGIN);
  }

  return actions_layout_v;
}

void Preview::UpdateCoverArtImage(CoverArt* cover_art)
{
  if (!preview_model_)
    return;

  previews::Style& style = dash::previews::Style::Instance();

  auto on_mouse_down = [this](int x, int y, unsigned long button_flags, unsigned long key_flags) { this->preview_container_->OnMouseDown(x, y, button_flags, key_flags); };

  std::string image_hint;
  if (preview_model_->image.Get())
  {
    glib::String tmp_icon(g_icon_to_string(preview_model_->image.Get()));
    image_hint = tmp_icon.Str();
  }
  if (!image_hint.empty())
    cover_art->SetImage(image_hint);
  else if (!preview_model_->image_source_uri.Get().empty())
    cover_art->GenerateImage(preview_model_->image_source_uri);
  else
    cover_art->SetNoImageAvailable();
  cover_art->SetFont(style.no_preview_image_font());

  cover_art->mouse_click.connect(on_mouse_down);
}

nux::Area* Preview::FindKeyFocusArea(unsigned int key_symbol,
                                      unsigned long x11_key_code,
                                      unsigned long special_keys_state)
{
  nux::Area* tab_area = tab_iterator_->FindKeyFocusArea(key_symbol, x11_key_code, special_keys_state);
  if (tab_area)
  {
    return tab_area;
  }

  return nullptr;
}

nux::Area* Preview::KeyNavIteration(nux::KeyNavDirection direction)
{
  return tab_iterator_->KeyNavIteration(direction);
}

void Preview::SetFirstInTabOrder(nux::InputArea* area)
{
  tab_iterator_->Prepend(area);
}

void Preview::SetLastInTabOrder(nux::InputArea* area)
{
  tab_iterator_->Append(area);
}

void Preview::SetTabOrder(nux::InputArea* area, int index)
{
  tab_iterator_->Insert(area, index);
}

void Preview::SetTabOrderBefore(nux::InputArea* area, nux::InputArea* after)
{
  tab_iterator_->InsertBefore(area, after);
}

void Preview::SetTabOrderAfter(nux::InputArea* area, nux::InputArea* before)
{
  tab_iterator_->InsertAfter(area, before);
}

void Preview::RemoveFromTabOrder(nux::InputArea* area)
{
  tab_iterator_->Remove(area);
}

void Preview::OnNavigateIn()
{
  nux::InputArea* default_focus = tab_iterator_->DefaultFocus();
  if (default_focus)
    nux::GetWindowCompositor().SetKeyFocusArea(default_focus);
}

sigc::signal<void> Preview::request_close() const
{
  return preview_container_->request_close;
}

void Preview::UpdateScale(double scale)
{
  if (image_)
    image_->scale = scale;

  if (title_)
    title_->SetScale(scale);
  if (subtitle_)
    subtitle_->SetScale(scale);
  if (description_)
    description_->SetScale(scale);

  if (preview_container_)
    preview_container_->scale = scale;

  if (preview_info_hints_)
    preview_info_hints_->scale = scale;

  for (nux::AbstractButton* button : action_buttons_)
  {
    if (ActionButton* bn = dynamic_cast<ActionButton*>(button))
      bn->scale = scale;

    if (ActionLink* link = dynamic_cast<ActionLink*>(button))
      link->scale = scale;
  }

  QueueRelayout();
  QueueDraw();
}

} // preview
} // dash
} // unity