// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/app_list/views/search_result_view.h"

#include <algorithm>

#include "ui/app_list/app_list_constants.h"
#include "ui/app_list/search_result.h"
#include "ui/app_list/views/progress_bar_view.h"
#include "ui/app_list/views/search_result_actions_view.h"
#include "ui/app_list/views/search_result_list_view.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/font.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/render_text.h"
#include "ui/views/controls/button/image_button.h"
#include "ui/views/controls/image_view.h"
#include "ui/views/controls/menu/menu_item_view.h"
#include "ui/views/controls/menu/menu_runner.h"

namespace {

const int kPreferredWidth = 300;
const int kPreferredHeight = 52;
const int kIconDimension = 32;
const int kIconPadding = 14;
const int kIconViewWidth = kIconDimension + 2 * kIconPadding;
const int kTextTrailPadding = kIconPadding;
const int kBorderSize = 1;

// Extra margin at the right of the rightmost action icon.
const int kActionButtonRightMargin = 8;

// Creates a RenderText of given |text| and |styles|. Caller takes ownership
// of returned RenderText.
gfx::RenderText* CreateRenderText(const base::string16& text,
                                  const app_list::SearchResult::Tags& tags) {
  gfx::RenderText* render_text = gfx::RenderText::CreateInstance();
  render_text->SetText(text);
  render_text->SetColor(app_list::kResultDefaultTextColor);

  for (app_list::SearchResult::Tags::const_iterator it = tags.begin();
       it != tags.end();
       ++it) {
    // NONE means default style so do nothing.
    if (it->styles == app_list::SearchResult::Tag::NONE)
      continue;

    if (it->styles & app_list::SearchResult::Tag::MATCH)
      render_text->ApplyStyle(gfx::BOLD, true, it->range);
    if (it->styles & app_list::SearchResult::Tag::DIM)
      render_text->ApplyColor(app_list::kResultDimmedTextColor, it->range);
    else if (it->styles & app_list::SearchResult::Tag::URL)
      render_text->ApplyColor(app_list::kResultURLTextColor, it->range);
  }

  return render_text;
}

}  // namespace

namespace app_list {

// static
const char SearchResultView::kViewClassName[] = "ui/app_list/SearchResultView";

SearchResultView::SearchResultView(SearchResultListView* list_view,
                                   SearchResultViewDelegate* delegate)
    : views::CustomButton(this),
      result_(NULL),
      list_view_(list_view),
      delegate_(delegate),
      icon_(new views::ImageView),
      actions_view_(new SearchResultActionsView(this)),
      progress_bar_(new ProgressBarView) {
  icon_->set_interactive(false);

  AddChildView(icon_);
  AddChildView(actions_view_);
  AddChildView(progress_bar_);
  set_context_menu_controller(this);
}

SearchResultView::~SearchResultView() {
  ClearResultNoRepaint();
}

void SearchResultView::SetResult(SearchResult* result) {
  ClearResultNoRepaint();

  result_ = result;
  if (result_)
    result_->AddObserver(this);

  OnIconChanged();
  OnActionsChanged();
  UpdateTitleText();
  UpdateDetailsText();
  OnIsInstallingChanged();
  SchedulePaint();
}

void SearchResultView::ClearResultNoRepaint() {
  if (result_)
    result_->RemoveObserver(this);
  result_ = NULL;
}

void SearchResultView::UpdateTitleText() {
  if (!result_ || result_->title().empty()) {
    title_text_.reset();
  } else {
    title_text_.reset(CreateRenderText(result_->title(),
                                       result_->title_tags()));
  }
}

void SearchResultView::UpdateDetailsText() {
  if (!result_ || result_->details().empty()) {
    details_text_.reset();
  } else {
    details_text_.reset(CreateRenderText(result_->details(),
                                         result_->details_tags()));
  }
}

const char* SearchResultView::GetClassName() const {
  return kViewClassName;
}

gfx::Size SearchResultView::GetPreferredSize() {
  return gfx::Size(kPreferredWidth, kPreferredHeight);
}

void SearchResultView::Layout() {
  gfx::Rect rect(GetContentsBounds());
  if (rect.IsEmpty())
    return;

  gfx::Rect icon_bounds(rect);
  icon_bounds.set_width(kIconViewWidth);
  icon_bounds.Inset(kIconPadding, (rect.height() - kIconDimension) / 2);
  icon_bounds.Intersect(rect);
  icon_->SetBoundsRect(icon_bounds);

  const int max_actions_width =
      (rect.right() - kActionButtonRightMargin - icon_bounds.right()) / 2;
  int actions_width = std::min(max_actions_width,
                               actions_view_->GetPreferredSize().width());

  gfx::Rect actions_bounds(rect);
  actions_bounds.set_x(rect.right() - kActionButtonRightMargin - actions_width);
  actions_bounds.set_width(actions_width);
  actions_view_->SetBoundsRect(actions_bounds);

  const int progress_width = rect.width() / 5;
  const int progress_height = progress_bar_->GetPreferredSize().height();
  const gfx::Rect progress_bounds(
      rect.right() - kActionButtonRightMargin - progress_width,
      rect.y() + (rect.height() - progress_height) / 2,
      progress_width,
      progress_height);
  progress_bar_->SetBoundsRect(progress_bounds);
}

void SearchResultView::ChildPreferredSizeChanged(views::View* child) {
  Layout();
}

void SearchResultView::OnPaint(gfx::Canvas* canvas) {
  gfx::Rect rect(GetContentsBounds());
  if (rect.IsEmpty())
    return;

  gfx::Rect content_rect(rect);
  content_rect.set_height(rect.height() - kBorderSize);

  const bool selected = list_view_->IsResultViewSelected(this);
  const bool hover = state() == STATE_HOVERED || state() == STATE_PRESSED;
  if (selected)
    canvas->FillRect(content_rect, kSelectedColor);
  else if (hover)
    canvas->FillRect(content_rect, kHighlightedColor);
  else
    canvas->FillRect(content_rect, kContentsBackgroundColor);

  gfx::Rect border_bottom = gfx::SubtractRects(rect, content_rect);
  canvas->FillRect(border_bottom, kResultBorderColor);

  gfx::Rect text_bounds(rect);
  text_bounds.set_x(kIconViewWidth);
  if (actions_view_->visible()) {
    text_bounds.set_width(
        rect.width() - kIconViewWidth - kTextTrailPadding -
        actions_view_->bounds().width() -
        (actions_view_->has_children() ? kActionButtonRightMargin : 0));
  } else {
    text_bounds.set_width(
        rect.width() - kIconViewWidth - kTextTrailPadding -
        progress_bar_->bounds().width() - kActionButtonRightMargin);
  }
  text_bounds.set_x(GetMirroredXWithWidthInView(text_bounds.x(),
                                                text_bounds.width()));

  if (title_text_ && details_text_) {
    gfx::Size title_size(text_bounds.width(),
                         title_text_->GetStringSize().height());
    gfx::Size details_size(text_bounds.width(),
                           details_text_->GetStringSize().height());
    int total_height = title_size.height() + + details_size.height();
    int y = text_bounds.y() + (text_bounds.height() - total_height) / 2;

    title_text_->SetDisplayRect(gfx::Rect(gfx::Point(text_bounds.x(), y),
                                          title_size));
    title_text_->Draw(canvas);

    y += title_size.height();
    details_text_->SetDisplayRect(gfx::Rect(gfx::Point(text_bounds.x(), y),
                                            details_size));
    details_text_->Draw(canvas);
  } else if (title_text_) {
    gfx::Size title_size(text_bounds.width(),
                         title_text_->GetStringSize().height());
    gfx::Rect centered_title_rect(text_bounds);
    centered_title_rect.ClampToCenteredSize(title_size);
    title_text_->SetDisplayRect(centered_title_rect);
    title_text_->Draw(canvas);
  }
}

void SearchResultView::ButtonPressed(views::Button* sender,
                                     const ui::Event& event) {
  DCHECK(sender == this);

  delegate_->SearchResultActivated(this, event.flags());
}

void SearchResultView::OnIconChanged() {
  gfx::ImageSkia image(result_ ? result_->icon() : gfx::ImageSkia());
  // Note this might leave the view with an old icon. But it is needed to avoid
  // flash when a SearchResult's icon is loaded asynchronously. In this case, it
  // looks nicer to keep the stale icon for a little while on screen instead of
  // clearing it out. It should work correctly as long as the SearchResult does
  // not forget to SetIcon when it's ready.
  if (image.isNull())
    return;

  // Scales down big icons but leave small ones unchanged.
  if (image.width() > kIconDimension || image.height() > kIconDimension) {
    image = gfx::ImageSkiaOperations::CreateResizedImage(
        image,
        skia::ImageOperations::RESIZE_BEST,
        gfx::Size(kIconDimension, kIconDimension));
  } else {
    icon_->ResetImageSize();
  }

  icon_->SetImage(image);
}

void SearchResultView::OnActionsChanged() {
  actions_view_->SetActions(result_ ? result_->actions()
                                    : SearchResult::Actions());
}

void SearchResultView::OnIsInstallingChanged() {
  const bool is_installing = result_ && result_->is_installing();
  actions_view_->SetVisible(!is_installing);
  progress_bar_->SetVisible(is_installing);
}

void SearchResultView::OnPercentDownloadedChanged() {
  progress_bar_->SetValue(result_->percent_downloaded() / 100.0);
}

void SearchResultView::OnItemInstalled() {
  delegate_->OnSearchResultInstalled(this);
}

void SearchResultView::OnItemUninstalled() {
  delegate_->OnSearchResultUninstalled(this);
}

void SearchResultView::OnSearchResultActionActivated(size_t index,
                                                     int event_flags) {
  DCHECK(result_);
  DCHECK_LT(index, result_->actions().size());

  delegate_->SearchResultActionActivated(this, index, event_flags);
}

void SearchResultView::ShowContextMenuForView(views::View* source,
                                              const gfx::Point& point,
                                              ui::MenuSourceType source_type) {
  ui::MenuModel* menu_model = result_->GetContextMenuModel();
  if (!menu_model)
    return;

  context_menu_runner_.reset(new views::MenuRunner(menu_model));
  if (context_menu_runner_->RunMenuAt(
          GetWidget(), NULL, gfx::Rect(point, gfx::Size()),
          views::MenuItemView::TOPLEFT, source_type,
          views::MenuRunner::HAS_MNEMONICS) ==
      views::MenuRunner::MENU_DELETED)
    return;
}

}  // namespace app_list