// 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.
//
// Download utility implementation

#include "chrome/browser/download/download_util.h"

#if defined(OS_WIN)
#include <shobjidl.h>
#endif
#include <string>

#include "base/file_util.h"
#include "base/i18n/rtl.h"
#include "base/i18n/time_formatting.h"
#include "base/lazy_instance.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/string16.h"
#include "base/string_number_conversions.h"
#include "base/stringprintf.h"
#include "base/sys_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "base/utf_string_conversions.h"
#include "base/value_conversions.h"
#include "base/values.h"
#include "base/win/windows_version.h"
#include "chrome/browser/download/download_create_info.h"
#include "chrome/browser/download/download_extensions.h"
#include "chrome/browser/download/download_item.h"
#include "chrome/browser/download/download_item_model.h"
#include "chrome/browser/download/download_manager.h"
#include "chrome/browser/download/download_types.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/time_format.h"
#include "content/browser/browser_thread.h"
#include "content/browser/renderer_host/render_view_host.h"
#include "content/browser/renderer_host/resource_dispatcher_host.h"
#include "content/browser/tab_contents/tab_contents.h"
#include "content/common/notification_service.h"
#include "grit/generated_resources.h"
#include "grit/locale_settings.h"
#include "grit/theme_resources.h"
#include "net/base/mime_util.h"
#include "net/base/net_util.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkShader.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/text/bytes_formatting.h"
#include "ui/gfx/canvas_skia.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/rect.h"

#if defined(TOOLKIT_VIEWS)
#include "ui/base/dragdrop/os_exchange_data.h"
#include "views/drag_utils.h"
#endif

#if defined(TOOLKIT_USES_GTK)
#if defined(TOOLKIT_VIEWS)
#include "ui/base/dragdrop/drag_drop_types.h"
#include "views/widget/native_widget_gtk.h"
#elif defined(TOOLKIT_GTK)
#include "chrome/browser/ui/gtk/custom_drag.h"
#include "chrome/browser/ui/gtk/unity_service.h"
#endif  // defined(TOOLKIT_GTK)
#endif  // defined(TOOLKIT_USES_GTK)

#if defined(OS_WIN)
#include "base/win/scoped_comptr.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/views/frame/browser_view.h"
#include "ui/base/dragdrop/drag_source.h"
#include "ui/base/dragdrop/os_exchange_data_provider_win.h"
#endif

// TODO(phajdan.jr): Find some standard location for this, maintaining
// the same value on all platforms.
static const double PI = 3.141592653589793;

namespace download_util {

// How many times to cycle the complete animation. This should be an odd number
// so that the animation ends faded out.
static const int kCompleteAnimationCycles = 5;

// The maximum number of 'uniquified' files we will try to create.
// This is used when the filename we're trying to download is already in use,
// so we create a new unique filename by appending " (nnn)" before the
// extension, where 1 <= nnn <= kMaxUniqueFiles.
// Also used by code that cleans up said files.
static const int kMaxUniqueFiles = 100;

namespace {

void GenerateFileNameInternal(const GURL& url,
                              const std::string& content_disposition,
                              const std::string& referrer_charset,
                              const std::string& suggested_name,
                              const std::string& mime_type,
                              FilePath* generated_name) {
  string16 default_file_name(
      l10n_util::GetStringUTF16(IDS_DEFAULT_DOWNLOAD_FILENAME));

  *generated_name = net::GenerateFileName(url, content_disposition,
                                          referrer_charset, suggested_name,
                                          mime_type, default_file_name);
}

// All possible error codes from the network module. Note that the error codes
// are all positive (since histograms expect positive sample values).
const int kAllNetErrorCodes[] = {
#define NET_ERROR(label, value) -(value),
#include "net/base/net_error_list.h"
#undef NET_ERROR
};

}  // namespace

// Download temporary file creation --------------------------------------------

class DefaultDownloadDirectory {
 public:
  const FilePath& path() const { return path_; }
 private:
  DefaultDownloadDirectory() {
    if (!PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS, &path_)) {
      NOTREACHED();
    }
    if (DownloadPathIsDangerous(path_)) {
      if (!PathService::Get(chrome::DIR_DEFAULT_DOWNLOADS_SAFE, &path_)) {
        NOTREACHED();
      }
    }
  }
  friend struct base::DefaultLazyInstanceTraits<DefaultDownloadDirectory>;
  FilePath path_;
};

static base::LazyInstance<DefaultDownloadDirectory>
    g_default_download_directory(base::LINKER_INITIALIZED);

const FilePath& GetDefaultDownloadDirectory() {
  return g_default_download_directory.Get().path();
}

bool CreateTemporaryFileForDownload(FilePath* temp_file) {
  if (file_util::CreateTemporaryFileInDir(GetDefaultDownloadDirectory(),
                                          temp_file))
    return true;
  return file_util::CreateTemporaryFile(temp_file);
}

bool DownloadPathIsDangerous(const FilePath& download_path) {
  FilePath desktop_dir;
  if (!PathService::Get(chrome::DIR_USER_DESKTOP, &desktop_dir)) {
    NOTREACHED();
    return false;
  }
  return (download_path == desktop_dir);
}

void GenerateFileNameFromRequest(const DownloadItem& download_item,
                                 FilePath* generated_name) {
  GenerateFileNameInternal(download_item.GetURL(),
                           download_item.content_disposition(),
                           download_item.referrer_charset(),
                           download_item.suggested_filename(),
                           download_item.mime_type(),
                           generated_name);
}

void GenerateFileNameFromSuggestedName(const GURL& url,
                                       const std::string& suggested_name,
                                       const std::string& mime_type,
                                       FilePath* generated_name) {
  // TODO(asanka): We should pass in a valid referrer_charset here.
  GenerateFileNameInternal(url, std::string(), std::string(),
                           suggested_name, mime_type, generated_name);
}

void RecordDownloadCount(DownloadCountTypes type) {
  UMA_HISTOGRAM_ENUMERATION(
      "Download.Counts", type, DOWNLOAD_COUNT_TYPES_LAST_ENTRY);
}

void RecordDownloadCompleted(const base::TimeTicks& start) {
  download_util::RecordDownloadCount(download_util::COMPLETED_COUNT);
  UMA_HISTOGRAM_LONG_TIMES("Download.Time", (base::TimeTicks::Now() - start));
}

void RecordDownloadInterrupted(int error, int64 received, int64 total) {
  download_util::RecordDownloadCount(download_util::INTERRUPTED_COUNT);
  UMA_HISTOGRAM_CUSTOM_ENUMERATION(
      "Download.InterruptedError",
      -error,
      base::CustomHistogram::ArrayToCustomRanges(
          kAllNetErrorCodes, arraysize(kAllNetErrorCodes)));

  // The maximum should be 2^kBuckets, to have the logarithmic bucket
  // boundaries fall on powers of 2.
  static const int kBuckets = 30;
  static const int64 kMaxKb = 1 << kBuckets;  // One Terabyte, in Kilobytes.
  int64 delta_bytes = total - received;
  bool unknown_size = total <= 0;
  int64 received_kb = received / 1024;
  int64 total_kb = total / 1024;
  UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedReceivedSizeK",
                              received_kb,
                              1,
                              kMaxKb,
                              kBuckets);
  if (!unknown_size) {
    UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedTotalSizeK",
                                total_kb,
                                1,
                                kMaxKb,
                                kBuckets);
    if (delta_bytes >= 0) {
      UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedOverrunBytes",
                                  delta_bytes,
                                  1,
                                  kMaxKb,
                                  kBuckets);
    } else {
      UMA_HISTOGRAM_CUSTOM_COUNTS("Download.InterruptedUnderrunBytes",
                                  -delta_bytes,
                                  1,
                                  kMaxKb,
                                  kBuckets);
    }
  }

  UMA_HISTOGRAM_BOOLEAN("Download.InterruptedUnknownSize", unknown_size);
}

namespace {

enum DownloadContent {
  DOWNLOAD_CONTENT_UNRECOGNIZED = 0,
  DOWNLOAD_CONTENT_TEXT = 1,
  DOWNLOAD_CONTENT_IMAGE = 2,
  DOWNLOAD_CONTENT_AUDIO = 3,
  DOWNLOAD_CONTENT_VIDEO = 4,
  DOWNLOAD_CONTENT_OCTET_STREAM = 5,
  DOWNLOAD_CONTENT_PDF = 6,
  DOWNLOAD_CONTENT_DOC = 7,
  DOWNLOAD_CONTENT_XLS = 8,
  DOWNLOAD_CONTENT_PPT = 9,
  DOWNLOAD_CONTENT_ARCHIVE = 10,
  DOWNLOAD_CONTENT_EXE = 11,
  DOWNLOAD_CONTENT_DMG = 12,
  DOWNLOAD_CONTENT_CRX = 13,
  DOWNLOAD_CONTENT_MAX = 14,
};

struct MimeTypeToDownloadContent {
  const char* mime_type;
  DownloadContent download_content;
};

static MimeTypeToDownloadContent kMapMimeTypeToDownloadContent[] = {
  {"application/octet-stream", DOWNLOAD_CONTENT_OCTET_STREAM},
  {"binary/octet-stream", DOWNLOAD_CONTENT_OCTET_STREAM},
  {"application/pdf", DOWNLOAD_CONTENT_PDF},
  {"application/msword", DOWNLOAD_CONTENT_DOC},
  {"application/vnd.ms-excel", DOWNLOAD_CONTENT_XLS},
  {"application/vns.ms-powerpoint", DOWNLOAD_CONTENT_PPT},
  {"application/zip", DOWNLOAD_CONTENT_ARCHIVE},
  {"application/x-gzip", DOWNLOAD_CONTENT_ARCHIVE},
  {"application/x-rar-compressed", DOWNLOAD_CONTENT_ARCHIVE},
  {"application/x-tar", DOWNLOAD_CONTENT_ARCHIVE},
  {"application/x-bzip", DOWNLOAD_CONTENT_ARCHIVE},
  {"application/x-exe", DOWNLOAD_CONTENT_EXE},
  {"application/x-apple-diskimage", DOWNLOAD_CONTENT_DMG},
  {"application/x-chrome-extension", DOWNLOAD_CONTENT_CRX},
};

}  // namespace

void RecordDownloadMimeType(const std::string& mime_type_string) {
  DownloadContent download_content = DOWNLOAD_CONTENT_UNRECOGNIZED;

  // Look up exact matches.
  for (size_t i = 0; i < arraysize(kMapMimeTypeToDownloadContent); ++i) {
    const MimeTypeToDownloadContent& entry =
        kMapMimeTypeToDownloadContent[i];
    if (mime_type_string == entry.mime_type) {
      download_content = entry.download_content;
      break;
    }
  }

  // Do partial matches.
  if (download_content == DOWNLOAD_CONTENT_UNRECOGNIZED) {
    if (StartsWithASCII(mime_type_string, "text/", true)) {
      download_content = DOWNLOAD_CONTENT_TEXT;
    } else if (StartsWithASCII(mime_type_string, "image/", true)) {
      download_content = DOWNLOAD_CONTENT_IMAGE;
    } else if (StartsWithASCII(mime_type_string, "audio/", true)) {
      download_content = DOWNLOAD_CONTENT_AUDIO;
    } else if (StartsWithASCII(mime_type_string, "video/", true)) {
      download_content = DOWNLOAD_CONTENT_VIDEO;
    }
  }

  // Record the value.
  UMA_HISTOGRAM_ENUMERATION("Download.ContentType",
                            download_content,
                            DOWNLOAD_CONTENT_MAX);
}

// Download progress painting --------------------------------------------------

// Common bitmaps used for download progress animations. We load them once the
// first time we do a progress paint, then reuse them as they are always the
// same.
SkBitmap* g_foreground_16 = NULL;
SkBitmap* g_background_16 = NULL;
SkBitmap* g_foreground_32 = NULL;
SkBitmap* g_background_32 = NULL;

void PaintDownloadProgress(gfx::Canvas* canvas,
#if defined(TOOLKIT_VIEWS)
                           views::View* containing_view,
#endif
                           int origin_x,
                           int origin_y,
                           int start_angle,
                           int percent_done,
                           PaintDownloadProgressSize size) {
  // Load up our common bitmaps
  if (!g_background_16) {
    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
    g_foreground_16 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_16);
    g_background_16 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_BACKGROUND_16);
    g_foreground_32 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_32);
    g_background_32 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_BACKGROUND_32);
  }

  SkBitmap* background = (size == BIG) ? g_background_32 : g_background_16;
  SkBitmap* foreground = (size == BIG) ? g_foreground_32 : g_foreground_16;

  const int kProgressIconSize = (size == BIG) ? kBigProgressIconSize :
                                                kSmallProgressIconSize;

  // We start by storing the bounds of the background and foreground bitmaps
  // so that it is easy to mirror the bounds if the UI layout is RTL.
  gfx::Rect background_bounds(origin_x, origin_y,
                              background->width(), background->height());
  gfx::Rect foreground_bounds(origin_x, origin_y,
                              foreground->width(), foreground->height());

#if defined(TOOLKIT_VIEWS)
  // Mirror the positions if necessary.
  int mirrored_x = containing_view->GetMirroredXForRect(background_bounds);
  background_bounds.set_x(mirrored_x);
  mirrored_x = containing_view->GetMirroredXForRect(foreground_bounds);
  foreground_bounds.set_x(mirrored_x);
#endif

  // Draw the background progress image.
  SkPaint background_paint;
  canvas->DrawBitmapInt(*background,
                        background_bounds.x(),
                        background_bounds.y(),
                        background_paint);

  // Layer the foreground progress image in an arc proportional to the download
  // progress. The arc grows clockwise, starting in the midnight position, as
  // the download progresses. However, if the download does not have known total
  // size (the server didn't give us one), then we just spin an arc around until
  // we're done.
  float sweep_angle = 0.0;
  float start_pos = static_cast<float>(kStartAngleDegrees);
  if (percent_done < 0) {
    sweep_angle = kUnknownAngleDegrees;
    start_pos = static_cast<float>(start_angle);
  } else if (percent_done > 0) {
    sweep_angle = static_cast<float>(kMaxDegrees / 100.0 * percent_done);
  }

  // Set up an arc clipping region for the foreground image. Don't bother using
  // a clipping region if it would round to 360 (really 0) degrees, since that
  // would eliminate the foreground completely and be quite confusing (it would
  // look like 0% complete when it should be almost 100%).
  SkPaint foreground_paint;
  if (sweep_angle < static_cast<float>(kMaxDegrees - 1)) {
    SkRect oval;
    oval.set(SkIntToScalar(foreground_bounds.x()),
             SkIntToScalar(foreground_bounds.y()),
             SkIntToScalar(foreground_bounds.x() + kProgressIconSize),
             SkIntToScalar(foreground_bounds.y() + kProgressIconSize));
    SkPath path;
    path.arcTo(oval,
               SkFloatToScalar(start_pos),
               SkFloatToScalar(sweep_angle), false);
    path.lineTo(SkIntToScalar(foreground_bounds.x() + kProgressIconSize / 2),
                SkIntToScalar(foreground_bounds.y() + kProgressIconSize / 2));

    SkShader* shader =
        SkShader::CreateBitmapShader(*foreground,
                                     SkShader::kClamp_TileMode,
                                     SkShader::kClamp_TileMode);
    SkMatrix shader_scale;
    shader_scale.setTranslate(SkIntToScalar(foreground_bounds.x()),
                              SkIntToScalar(foreground_bounds.y()));
    shader->setLocalMatrix(shader_scale);
    foreground_paint.setShader(shader);
    foreground_paint.setAntiAlias(true);
    shader->unref();
    canvas->AsCanvasSkia()->drawPath(path, foreground_paint);
    return;
  }

  canvas->DrawBitmapInt(*foreground,
                        foreground_bounds.x(),
                        foreground_bounds.y(),
                        foreground_paint);
}

void PaintDownloadComplete(gfx::Canvas* canvas,
#if defined(TOOLKIT_VIEWS)
                           views::View* containing_view,
#endif
                           int origin_x,
                           int origin_y,
                           double animation_progress,
                           PaintDownloadProgressSize size) {
  // Load up our common bitmaps.
  if (!g_foreground_16) {
    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
    g_foreground_16 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_16);
    g_foreground_32 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_32);
  }

  SkBitmap* complete = (size == BIG) ? g_foreground_32 : g_foreground_16;

  gfx::Rect complete_bounds(origin_x, origin_y,
                            complete->width(), complete->height());
#if defined(TOOLKIT_VIEWS)
  // Mirror the positions if necessary.
  complete_bounds.set_x(containing_view->GetMirroredXForRect(complete_bounds));
#endif

  // Start at full opacity, then loop back and forth five times before ending
  // at zero opacity.
  double opacity = sin(animation_progress * PI * kCompleteAnimationCycles +
                   PI/2) / 2 + 0.5;

  canvas->SaveLayerAlpha(static_cast<int>(255.0 * opacity), complete_bounds);
  canvas->AsCanvasSkia()->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
  canvas->DrawBitmapInt(*complete, complete_bounds.x(), complete_bounds.y());
  canvas->Restore();
}

void PaintDownloadInterrupted(gfx::Canvas* canvas,
#if defined(TOOLKIT_VIEWS)
                              views::View* containing_view,
#endif
                              int origin_x,
                              int origin_y,
                              double animation_progress,
                              PaintDownloadProgressSize size) {
  // Load up our common bitmaps.
  if (!g_foreground_16) {
    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
    g_foreground_16 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_16);
    g_foreground_32 = rb.GetBitmapNamed(IDR_DOWNLOAD_PROGRESS_FOREGROUND_32);
  }

  SkBitmap* complete = (size == BIG) ? g_foreground_32 : g_foreground_16;

  gfx::Rect complete_bounds(origin_x, origin_y,
                            complete->width(), complete->height());
#if defined(TOOLKIT_VIEWS)
  // Mirror the positions if necessary.
  complete_bounds.set_x(containing_view->GetMirroredXForRect(complete_bounds));
#endif

  // Start at zero opacity, then loop back and forth five times before ending
  // at full opacity.
  double opacity = sin(
      (1.0 - animation_progress) * PI * kCompleteAnimationCycles + PI/2) / 2 +
          0.5;

  canvas->SaveLayerAlpha(static_cast<int>(255.0 * opacity), complete_bounds);
  canvas->AsCanvasSkia()->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
  canvas->DrawBitmapInt(*complete, complete_bounds.x(), complete_bounds.y());
  canvas->Restore();
}

// Load a language dependent height so that the dangerous download confirmation
// message doesn't overlap with the download link label.
int GetBigProgressIconSize() {
  static int big_progress_icon_size = 0;
  if (big_progress_icon_size == 0) {
    string16 locale_size_str =
        l10n_util::GetStringUTF16(IDS_DOWNLOAD_BIG_PROGRESS_SIZE);
    bool rc = base::StringToInt(locale_size_str, &big_progress_icon_size);
    if (!rc || big_progress_icon_size < kBigProgressIconSize) {
      NOTREACHED();
      big_progress_icon_size = kBigProgressIconSize;
    }
  }

  return big_progress_icon_size;
}

int GetBigProgressIconOffset() {
  return (GetBigProgressIconSize() - kBigIconSize) / 2;
}

#if defined(TOOLKIT_VIEWS)
// Download dragging
void DragDownload(const DownloadItem* download,
                  gfx::Image* icon,
                  gfx::NativeView view) {
  DCHECK(download);

  // Set up our OLE machinery
  ui::OSExchangeData data;

  if (icon) {
    drag_utils::CreateDragImageForFile(
        download->GetFileNameToReportUser(), *icon, &data);
  }

  const FilePath full_path = download->full_path();
  data.SetFilename(full_path);

  std::string mime_type = download->mime_type();
  if (mime_type.empty())
    net::GetMimeTypeFromFile(full_path, &mime_type);

  // Add URL so that we can load supported files when dragged to TabContents.
  if (net::IsSupportedMimeType(mime_type)) {
    data.SetURL(net::FilePathToFileURL(full_path),
                download->GetFileNameToReportUser().LossyDisplayName());
  }

#if defined(OS_WIN)
  scoped_refptr<ui::DragSource> drag_source(new ui::DragSource);

  // Run the drag and drop loop
  DWORD effects;
  DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data),
             drag_source.get(), DROPEFFECT_COPY | DROPEFFECT_LINK, &effects);
#elif defined(TOOLKIT_USES_GTK)
  GtkWidget* root = gtk_widget_get_toplevel(view);
  if (!root)
    return;

  views::NativeWidgetGtk* widget = static_cast<views::NativeWidgetGtk*>(
      views::Widget::GetWidgetForNativeView(root)->native_widget());
  if (!widget)
    return;

  widget->DoDrag(data,
                 ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK);
#endif  // OS_WIN
}
#elif defined(USE_X11)
void DragDownload(const DownloadItem* download,
                  gfx::Image* icon,
                  gfx::NativeView view) {
  DownloadItemDrag::BeginDrag(download, icon);
}
#endif  // USE_X11

DictionaryValue* CreateDownloadItemValue(DownloadItem* download, int id) {
  DictionaryValue* file_value = new DictionaryValue();

  file_value->SetInteger("started",
      static_cast<int>(download->start_time().ToTimeT()));
  file_value->SetString("since_string",
      TimeFormat::RelativeDate(download->start_time(), NULL));
  file_value->SetString("date_string",
      base::TimeFormatShortDate(download->start_time()));
  file_value->SetInteger("id", id);

  FilePath download_path(download->GetTargetFilePath());
  file_value->Set("file_path", base::CreateFilePathValue(download_path));
  file_value->SetString("file_url",
                        net::FilePathToFileURL(download_path).spec());

  // Keep file names as LTR.
  string16 file_name = download->GetFileNameToReportUser().LossyDisplayName();
  file_name = base::i18n::GetDisplayStringInLTRDirectionality(file_name);
  file_value->SetString("file_name", file_name);
  file_value->SetString("url", download->GetURL().spec());
  file_value->SetBoolean("otr", download->is_otr());
  file_value->SetInteger("total", static_cast<int>(download->total_bytes()));
  file_value->SetBoolean("file_externally_removed",
                         download->file_externally_removed());

  if (download->IsInProgress()) {
    if (download->safety_state() == DownloadItem::DANGEROUS) {
      file_value->SetString("state", "DANGEROUS");
      DCHECK(download->GetDangerType() == DownloadItem::DANGEROUS_FILE ||
             download->GetDangerType() == DownloadItem::DANGEROUS_URL);
      const char* danger_type_value =
          download->GetDangerType() == DownloadItem::DANGEROUS_FILE ?
          "DANGEROUS_FILE" : "DANGEROUS_URL";
      file_value->SetString("danger_type", danger_type_value);
    } else if (download->is_paused()) {
      file_value->SetString("state", "PAUSED");
    } else {
      file_value->SetString("state", "IN_PROGRESS");
    }

    file_value->SetString("progress_status_text",
        GetProgressStatusText(download));

    file_value->SetInteger("percent",
        static_cast<int>(download->PercentComplete()));
    file_value->SetInteger("received",
        static_cast<int>(download->received_bytes()));
  } else if (download->IsInterrupted()) {
    file_value->SetString("state", "INTERRUPTED");

    file_value->SetString("progress_status_text",
        GetProgressStatusText(download));

    file_value->SetInteger("percent",
        static_cast<int>(download->PercentComplete()));
    file_value->SetInteger("received",
        static_cast<int>(download->received_bytes()));
  } else if (download->IsCancelled()) {
    file_value->SetString("state", "CANCELLED");
  } else if (download->IsComplete()) {
    if (download->safety_state() == DownloadItem::DANGEROUS)
      file_value->SetString("state", "DANGEROUS");
    else
      file_value->SetString("state", "COMPLETE");
  } else if (download->state() == DownloadItem::REMOVING) {
    file_value->SetString("state", "REMOVING");
  } else {
    NOTREACHED() << "state undefined";
  }

  return file_value;
}

string16 GetProgressStatusText(DownloadItem* download) {
  int64 total = download->total_bytes();
  int64 size = download->received_bytes();
  string16 received_size = ui::FormatBytes(size);
  string16 amount = received_size;

  // Adjust both strings for the locale direction since we don't yet know which
  // string we'll end up using for constructing the final progress string.
  base::i18n::AdjustStringForLocaleDirection(&amount);

  if (total) {
    string16 total_text = ui::FormatBytes(total);
    base::i18n::AdjustStringForLocaleDirection(&total_text);

    base::i18n::AdjustStringForLocaleDirection(&received_size);
    amount = l10n_util::GetStringFUTF16(IDS_DOWNLOAD_TAB_PROGRESS_SIZE,
                                        received_size,
                                        total_text);
  } else {
    amount.assign(received_size);
  }
  int64 current_speed = download->CurrentSpeed();
  string16 speed_text = ui::FormatSpeed(current_speed);
  base::i18n::AdjustStringForLocaleDirection(&speed_text);

  base::TimeDelta remaining;
  string16 time_remaining;
  if (download->is_paused())
    time_remaining = l10n_util::GetStringUTF16(IDS_DOWNLOAD_PROGRESS_PAUSED);
  else if (download->TimeRemaining(&remaining))
    time_remaining = TimeFormat::TimeRemaining(remaining);

  if (time_remaining.empty()) {
    base::i18n::AdjustStringForLocaleDirection(&amount);
    return l10n_util::GetStringFUTF16(
        IDS_DOWNLOAD_TAB_PROGRESS_STATUS_TIME_UNKNOWN, speed_text, amount);
  }
  return l10n_util::GetStringFUTF16(IDS_DOWNLOAD_TAB_PROGRESS_STATUS,
                                    speed_text, amount, time_remaining);
}

#if !defined(OS_MACOSX)
void UpdateAppIconDownloadProgress(int download_count,
                                   bool progress_known,
                                   float progress) {
#if defined(OS_WIN)
  // Taskbar progress bar is only supported on Win7.
  if (base::win::GetVersion() < base::win::VERSION_WIN7)
    return;

  base::win::ScopedComPtr<ITaskbarList3> taskbar;
  HRESULT result = taskbar.CreateInstance(CLSID_TaskbarList, NULL,
                                          CLSCTX_INPROC_SERVER);
  if (FAILED(result)) {
    VLOG(1) << "Failed creating a TaskbarList object: " << result;
    return;
  }

  result = taskbar->HrInit();
  if (FAILED(result)) {
    LOG(ERROR) << "Failed initializing an ITaskbarList3 interface.";
    return;
  }

  // Iterate through all the browser windows, and draw the progress bar.
  for (BrowserList::const_iterator browser_iterator = BrowserList::begin();
      browser_iterator != BrowserList::end(); browser_iterator++) {
    Browser* browser = *browser_iterator;
    BrowserWindow* window = browser->window();
    if (!window)
      continue;
    HWND frame = window->GetNativeHandle();
    if (download_count == 0 || progress == 1.0f)
      taskbar->SetProgressState(frame, TBPF_NOPROGRESS);
    else if (!progress_known)
      taskbar->SetProgressState(frame, TBPF_INDETERMINATE);
    else
      taskbar->SetProgressValue(frame, static_cast<int>(progress * 100), 100);
  }
#elif defined(TOOLKIT_GTK)
  unity::SetDownloadCount(download_count);
  unity::SetProgressFraction(progress);
#endif
}
#endif

// Appends the passed the number between parenthesis the path before the
// extension.
void AppendNumberToPath(FilePath* path, int number) {
  *path = path->InsertBeforeExtensionASCII(StringPrintf(" (%d)", number));
}

// Attempts to find a number that can be appended to that path to make it
// unique. If |path| does not exist, 0 is returned.  If it fails to find such
// a number, -1 is returned.
int GetUniquePathNumber(const FilePath& path) {
  if (!file_util::PathExists(path))
    return 0;

  FilePath new_path;
  for (int count = 1; count <= kMaxUniqueFiles; ++count) {
    new_path = FilePath(path);
    AppendNumberToPath(&new_path, count);

    if (!file_util::PathExists(new_path))
      return count;
  }

  return -1;
}

void DownloadUrl(
    const GURL& url,
    const GURL& referrer,
    const std::string& referrer_charset,
    const DownloadSaveInfo& save_info,
    ResourceDispatcherHost* rdh,
    int render_process_host_id,
    int render_view_id,
    const content::ResourceContext* context) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

  rdh->BeginDownload(url,
                     referrer,
                     save_info,
                     true,  // Show "Save as" UI.
                     render_process_host_id,
                     render_view_id,
                     *context);
}

void NotifyDownloadInitiated(int render_process_id, int render_view_id) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  RenderViewHost* rvh = RenderViewHost::FromID(render_process_id,
                                               render_view_id);
  if (!rvh)
    return;

  NotificationService::current()->Notify(
      chrome::NOTIFICATION_DOWNLOAD_INITIATED, Source<RenderViewHost>(rvh),
      NotificationService::NoDetails());
}

int GetUniquePathNumberWithCrDownload(const FilePath& path) {
  if (!file_util::PathExists(path) &&
      !file_util::PathExists(GetCrDownloadPath(path)))
    return 0;

  FilePath new_path;
  for (int count = 1; count <= kMaxUniqueFiles; ++count) {
    new_path = FilePath(path);
    AppendNumberToPath(&new_path, count);

    if (!file_util::PathExists(new_path) &&
        !file_util::PathExists(GetCrDownloadPath(new_path)))
      return count;
  }

  return -1;
}

FilePath GetCrDownloadPath(const FilePath& suggested_path) {
  FilePath::StringType file_name;
  base::SStringPrintf(
      &file_name,
      PRFilePathLiteral FILE_PATH_LITERAL(".crdownload"),
      suggested_path.value().c_str());
  return FilePath(file_name);
}

}  // namespace download_util