// Copyright (c) 2011 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 "chrome/browser/ui/views/sad_tab_view.h"

#include "base/utf_string_conversions.h"
#include "chrome/browser/google/google_util.h"
#include "chrome/common/url_constants.h"
#include "content/browser/tab_contents/tab_contents.h"
#include "content/browser/tab_contents/tab_contents_delegate.h"
#include "grit/generated_resources.h"
#include "grit/locale_settings.h"
#include "grit/theme_resources.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/canvas_skia.h"
#include "ui/gfx/size.h"
#include "ui/gfx/skia_util.h"

static const int kSadTabOffset = -64;
static const int kIconTitleSpacing = 20;
static const int kTitleMessageSpacing = 15;
static const int kMessageBottomMargin = 20;
static const float kMessageSize = 0.65f;
static const SkColor kTitleColor = SK_ColorWHITE;
static const SkColor kMessageColor = SK_ColorWHITE;
static const SkColor kLinkColor = SK_ColorWHITE;
static const SkColor kCrashBackgroundColor = SkColorSetRGB(35, 48, 64);
static const SkColor kCrashBackgroundEndColor = SkColorSetRGB(35, 48, 64);
// TODO(gspencer): update these colors when the UI team has picked
// official versions.  See http://crosbug.com/10711.
static const SkColor kKillBackgroundColor = SkColorSetRGB(57, 48, 88);
static const SkColor kKillBackgroundEndColor = SkColorSetRGB(57, 48, 88);

// Font size correction.
#if defined(CROS_FONTS_USING_BCI)
static const int kTitleFontSizeDelta = 1;
static const int kMessageFontSizeDelta = 0;
#else
static const int kTitleFontSizeDelta = 2;
static const int kMessageFontSizeDelta = 1;
#endif

// static
SkBitmap* SadTabView::sad_tab_bitmap_ = NULL;
gfx::Font* SadTabView::title_font_ = NULL;
gfx::Font* SadTabView::message_font_ = NULL;
std::wstring SadTabView::title_;
std::wstring SadTabView::message_;
int SadTabView::title_width_;

SadTabView::SadTabView(TabContents* tab_contents, Kind kind)
    : tab_contents_(tab_contents),
      learn_more_link_(NULL),
      kind_(kind) {
  DCHECK(tab_contents);

  InitClass(kind);

  if (tab_contents != NULL) {
    learn_more_link_ =
        new views::Link(UTF16ToWide(l10n_util::GetStringUTF16(IDS_LEARN_MORE)));
    learn_more_link_->SetFont(*message_font_);
    learn_more_link_->SetNormalColor(kLinkColor);
    learn_more_link_->SetController(this);
    AddChildView(learn_more_link_);
  }
}

SadTabView::~SadTabView() {}

void SadTabView::OnPaint(gfx::Canvas* canvas) {
  SkPaint paint;
  SkSafeUnref(paint.setShader(
      gfx::CreateGradientShader(
          0,
          height(),
          kind_ == CRASHED ? kCrashBackgroundColor : kKillBackgroundColor,
          kind_ == CRASHED ?
            kCrashBackgroundEndColor : kKillBackgroundEndColor)));
  paint.setStyle(SkPaint::kFill_Style);
  canvas->AsCanvasSkia()->drawRectCoords(
      0, 0, SkIntToScalar(width()), SkIntToScalar(height()), paint);

  canvas->DrawBitmapInt(*sad_tab_bitmap_, icon_bounds_.x(), icon_bounds_.y());

  canvas->DrawStringInt(WideToUTF16Hack(title_), *title_font_, kTitleColor,
                        title_bounds_.x(), title_bounds_.y(),
                        title_bounds_.width(), title_bounds_.height(),
                        gfx::Canvas::TEXT_ALIGN_CENTER);

  canvas->DrawStringInt(WideToUTF16Hack(message_), *message_font_,
                        kMessageColor, message_bounds_.x(), message_bounds_.y(),
                        message_bounds_.width(), message_bounds_.height(),
                        gfx::Canvas::MULTI_LINE);

  if (learn_more_link_ != NULL)
    learn_more_link_->SetBounds(link_bounds_.x(), link_bounds_.y(),
                                link_bounds_.width(), link_bounds_.height());
}

void SadTabView::Layout() {
  int icon_width = sad_tab_bitmap_->width();
  int icon_height = sad_tab_bitmap_->height();
  int icon_x = (width() - icon_width) / 2;
  int icon_y = ((height() - icon_height) / 2) + kSadTabOffset;
  icon_bounds_.SetRect(icon_x, icon_y, icon_width, icon_height);

  int title_x = (width() - title_width_) / 2;
  int title_y = icon_bounds_.bottom() + kIconTitleSpacing;
  int title_height = title_font_->GetHeight();
  title_bounds_.SetRect(title_x, title_y, title_width_, title_height);

  gfx::CanvasSkia cc(0, 0, true);
  int message_width = static_cast<int>(width() * kMessageSize);
  int message_height = 0;
  cc.SizeStringInt(WideToUTF16Hack(message_), *message_font_, &message_width,
                   &message_height, gfx::Canvas::MULTI_LINE);
  int message_x = (width() - message_width) / 2;
  int message_y = title_bounds_.bottom() + kTitleMessageSpacing;
  message_bounds_.SetRect(message_x, message_y, message_width, message_height);

  if (learn_more_link_ != NULL) {
    gfx::Size sz = learn_more_link_->GetPreferredSize();
    gfx::Insets insets = learn_more_link_->GetInsets();
    link_bounds_.SetRect((width() - sz.width()) / 2,
                         message_bounds_.bottom() + kTitleMessageSpacing -
                         insets.top(), sz.width(), sz.height());
  }
}

void SadTabView::LinkActivated(views::Link* source, int event_flags) {
  if (tab_contents_ != NULL && source == learn_more_link_) {
    GURL help_url =
        google_util::AppendGoogleLocaleParam(GURL(kind_ == CRASHED ?
                                                  chrome::kCrashReasonURL :
                                                  chrome::kKillReasonURL));
    tab_contents_->OpenURL(help_url, GURL(), CURRENT_TAB, PageTransition::LINK);
  }
}

// static
void SadTabView::InitClass(Kind kind) {
  static bool initialized = false;
  if (!initialized) {
    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
    title_font_ = new gfx::Font(
        rb.GetFont(ResourceBundle::BaseFont).DeriveFont(kTitleFontSizeDelta,
                                                        gfx::Font::BOLD));
    message_font_ = new gfx::Font(
        rb.GetFont(ResourceBundle::BaseFont).DeriveFont(kMessageFontSizeDelta));
    sad_tab_bitmap_ = rb.GetBitmapNamed(
        kind == CRASHED ? IDR_SAD_TAB : IDR_KILLED_TAB);

    title_ = UTF16ToWide(l10n_util::GetStringUTF16(
        kind == CRASHED ? IDS_SAD_TAB_TITLE : IDS_KILLED_TAB_TITLE));
    title_width_ = title_font_->GetStringWidth(WideToUTF16Hack(title_));
    message_ = UTF16ToWide(l10n_util::GetStringUTF16(
        kind == CRASHED ? IDS_SAD_TAB_MESSAGE : IDS_KILLED_TAB_MESSAGE));

    initialized = true;
  }
}