// 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 "chrome/browser/ui/gtk/sad_tab_gtk.h"

#include "base/metrics/histogram.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/ui/gtk/gtk_chrome_link_button.h"
#include "chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/web_contents.h"
#include "grit/generated_resources.h"
#include "grit/locale_settings.h"
#include "grit/theme_resources.h"
#include "ui/base/gtk/gtk_hig_constants.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/image/image.h"

using content::OpenURLParams;
using content::WebContents;

namespace {

// Background color of the content (a grayish blue) for a crashed tab.
const GdkColor kCrashedBackgroundColor = GDK_COLOR_RGB(35, 48, 64);

// Background color of the content (a grayish purple) for a killed
// tab.  TODO(gspencer): update this for the "real" color when the UI
// team provides one.  See http://crosbug.com/10711
const GdkColor kKilledBackgroundColor = GDK_COLOR_RGB(57, 48, 88);

// Construct a centered GtkLabel with a white foreground.
// |format| is a printf-style format containing a %s;
// |str| is substituted into the format.
GtkWidget* MakeWhiteMarkupLabel(const char* format, const std::string& str) {
  GtkWidget* label = gtk_label_new(NULL);
  char* markup = g_markup_printf_escaped(format, str.c_str());
  gtk_label_set_markup(GTK_LABEL(label), markup);
  g_free(markup);

  // Center align and justify it.
  gtk_misc_set_alignment(GTK_MISC(label), 0.5, 0.5);
  gtk_label_set_justify(GTK_LABEL(label), GTK_JUSTIFY_CENTER);

  // Set text to white.
  GdkColor white = ui::kGdkWhite;
  gtk_widget_modify_fg(label, GTK_STATE_NORMAL, &white);

  return label;
}

}  // namespace

SadTabGtk::SadTabGtk(WebContents* web_contents, chrome::SadTabKind kind)
    : web_contents_(web_contents),
      kind_(kind) {
  DCHECK(web_contents_);

  switch (kind_) {
    case chrome::SAD_TAB_KIND_CRASHED: {
      static int crashed = 0;
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Tabs.SadTab.CrashCreated", ++crashed, 1, 1000, 50);
      break;
    }
    case chrome::SAD_TAB_KIND_KILLED: {
      static int killed = 0;
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Tabs.SadTab.KilledCreated", ++killed, 1, 1000, 50);
      break;
    }
    default:
      NOTREACHED();
  }

  // Use an event box to get the background painting correctly.
  event_box_.Own(gtk_event_box_new());
  gtk_widget_modify_bg(event_box_.get(), GTK_STATE_NORMAL,
      (kind == chrome::SAD_TAB_KIND_CRASHED) ?
          &kCrashedBackgroundColor : &kKilledBackgroundColor);
  // Allow ourselves to be resized arbitrarily small.
  gtk_widget_set_size_request(event_box_.get(), 0, 0);

  GtkWidget* centering = gtk_alignment_new(0.5, 0.5, 0.0, 0.0);
  gtk_container_add(GTK_CONTAINER(event_box_.get()), centering);

  // Use a vertical box to contain icon, title, message and link.
  GtkWidget* vbox = gtk_vbox_new(FALSE, 0);
  gtk_container_add(GTK_CONTAINER(centering), vbox);

  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  // Add center-aligned image.
  GtkWidget* image = gtk_image_new_from_pixbuf(rb.GetNativeImageNamed(
      (kind == chrome::SAD_TAB_KIND_CRASHED) ?
          IDR_SAD_TAB : IDR_KILLED_TAB).ToGdkPixbuf());
  gtk_misc_set_alignment(GTK_MISC(image), 0.5, 0.5);
  gtk_box_pack_start(GTK_BOX(vbox), image, FALSE, FALSE, 0);

  // Add spacer between image and title.
  GtkWidget* spacer = gtk_label_new(NULL);
  gtk_label_set_markup(GTK_LABEL(spacer), "<span size=\"larger\"> </span>");
  gtk_box_pack_start(GTK_BOX(vbox), spacer, FALSE, FALSE, 0);

  // Add center-aligned title.
  GtkWidget* title = MakeWhiteMarkupLabel(
      "<span size=\"larger\" style=\"normal\"><b>%s</b></span>",
      l10n_util::GetStringUTF8((kind == chrome::SAD_TAB_KIND_CRASHED) ?
          IDS_SAD_TAB_TITLE : IDS_KILLED_TAB_TITLE));
  gtk_box_pack_start(GTK_BOX(vbox), title, FALSE, FALSE, 0);

  // Add spacer between title and message.
  spacer = gtk_label_new(" ");
  gtk_box_pack_start(GTK_BOX(vbox), spacer, FALSE, FALSE, 0);

  // Add center-aligned message.
  GtkWidget* message = MakeWhiteMarkupLabel(
      "<span style=\"normal\">%s</span>",
      l10n_util::GetStringUTF8((kind == chrome::SAD_TAB_KIND_CRASHED) ?
          IDS_SAD_TAB_MESSAGE : IDS_KILLED_TAB_MESSAGE));
  gtk_label_set_line_wrap(GTK_LABEL(message), TRUE);
  gtk_box_pack_start(GTK_BOX(vbox), message, FALSE, FALSE, 0);

  // Add spacer between message and link.
  spacer = gtk_label_new(" ");
  gtk_box_pack_start(GTK_BOX(vbox), spacer, FALSE, FALSE, 0);

  if (web_contents_) {
    // Create the help link and alignment.
    std::string link_text(l10n_util::GetStringUTF8(
        (kind == chrome::SAD_TAB_KIND_CRASHED) ?
            IDS_SAD_TAB_HELP_LINK : IDS_LEARN_MORE));
    GtkWidget* link = gtk_chrome_link_button_new(link_text.c_str());
    gtk_chrome_link_button_set_normal_color(GTK_CHROME_LINK_BUTTON(link),
                                            &ui::kGdkWhite);
    g_signal_connect(link, "clicked", G_CALLBACK(OnLinkButtonClickThunk), this);
    GtkWidget* help_alignment = gtk_alignment_new(0.5, 0.5, 0.0, 0.0);

    if (kind == chrome::SAD_TAB_KIND_CRASHED) {
      // Use a horizontal box to contain the help text and link.
      GtkWidget* help_hbox = gtk_hbox_new(FALSE, 0);
      gtk_container_add(GTK_CONTAINER(vbox), help_hbox);

      size_t offset = 0;
      string16 help_text(l10n_util::GetStringFUTF16(IDS_SAD_TAB_HELP_MESSAGE,
                                                    string16(), &offset));
      std::string help_prefix_text(UTF16ToUTF8(help_text.substr(0, offset)));
      std::string help_suffix_text(UTF16ToUTF8(help_text.substr(offset)));

      GtkWidget* help_prefix = MakeWhiteMarkupLabel(
          "<span style=\"normal\">%s</span>", help_prefix_text);
      GtkWidget* help_suffix = MakeWhiteMarkupLabel(
          "<span style=\"normal\">%s</span>", help_suffix_text);

      // Add the help link and text to the horizontal box.
      gtk_box_pack_start(GTK_BOX(help_hbox), help_prefix, FALSE, FALSE, 0);
      GtkWidget* link_alignment = gtk_alignment_new(0.5, 0.5, 0.0, 0.0);
      gtk_container_add(GTK_CONTAINER(link_alignment), link);
      gtk_box_pack_start(GTK_BOX(help_hbox), link_alignment, FALSE, FALSE, 0);
      gtk_box_pack_start(GTK_BOX(help_hbox), help_suffix, FALSE, FALSE, 0);
    } else {
      // Add just the help link to a centered alignment.
      gtk_container_add(GTK_CONTAINER(help_alignment), link);
    }
    gtk_box_pack_start(GTK_BOX(vbox), help_alignment, FALSE, FALSE, 0);
  }

  gtk_widget_show_all(event_box_.get());
}

SadTabGtk::~SadTabGtk() {
  event_box_.Destroy();
}

void SadTabGtk::Show() {
  switch (kind_) {
    case chrome::SAD_TAB_KIND_CRASHED: {
      static int crashed = 0;
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Tabs.SadTab.CrashDisplayed", ++crashed, 1, 1000, 50);
      break;
    }
    case chrome::SAD_TAB_KIND_KILLED: {
      static int killed = 0;
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Tabs.SadTab.KilledDisplayed", ++killed, 1, 1000, 50);
      break;
    }
    default:
      NOTREACHED();
  }

  GtkWidget* expanded_container =
      ChromeWebContentsViewDelegateGtk::GetFor(web_contents_)->
          expanded_container();
  gtk_container_add(GTK_CONTAINER(expanded_container), event_box_.get());
  gtk_widget_show(event_box_.get());
}

void SadTabGtk::Close() {
  GtkWidget* expanded_container =
      ChromeWebContentsViewDelegateGtk::GetFor(web_contents_)->
          expanded_container();
  gtk_container_remove(GTK_CONTAINER(expanded_container), event_box_.get());
}

void SadTabGtk::OnLinkButtonClick(GtkWidget* sender) {
  if (web_contents_) {
    GURL help_url((kind_ == chrome::SAD_TAB_KIND_CRASHED) ?
        chrome::kCrashReasonURL : chrome::kKillReasonURL);
    OpenURLParams params(help_url, content::Referrer(), CURRENT_TAB,
                         content::PAGE_TRANSITION_LINK, false);
    web_contents_->OpenURL(params);
  }
}

namespace chrome {

SadTab* SadTab::Create(content::WebContents* web_contents, SadTabKind kind) {
  return new SadTabGtk(web_contents, kind);
}

}  // namespace chrome