// 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/download/download_item_model.h"

#include "base/i18n/number_formatting.h"
#include "base/i18n/rtl.h"
#include "base/string16.h"
#include "base/sys_string_conversions.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/download/chrome_download_manager_delegate.h"
#include "chrome/common/time_format.h"
#include "content/public/browser/download_danger_type.h"
#include "content/public/browser/download_item.h"
#include "grit/chromium_strings.h"
#include "grit/generated_resources.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/text/bytes_formatting.h"
#include "ui/base/text/text_elider.h"

#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/gdata/gdata_download_observer.h"
#endif

using base::TimeDelta;
using content::DownloadItem;

// -----------------------------------------------------------------------------
// DownloadItemModel

DownloadItemModel::DownloadItemModel(DownloadItem* download)
    : BaseDownloadItemModel(download) {
}

void DownloadItemModel::CancelTask() {
  download_->Cancel(true /* update history service */);
}

string16 DownloadItemModel::GetStatusText() {
  int64 size = download_->GetReceivedBytes();
  int64 total = download_->AllDataSaved() ? size : download_->GetTotalBytes();
  bool is_gdata = false;
#if defined(OS_CHROMEOS)
  is_gdata = gdata::GDataDownloadObserver::IsGDataDownload(download_);
  // For GData downloads, the size is the count of bytes uploaded.
  if (is_gdata)
    size = gdata::GDataDownloadObserver::GetUploadedBytes(download_);
#endif

  ui::DataUnits amount_units = ui::GetByteDisplayUnits(total);
  string16 simple_size = ui::FormatBytesWithUnits(size, amount_units, false);

  // In RTL locales, we render the text "size/total" in an RTL context. This
  // is problematic since a string such as "123/456 MB" is displayed
  // as "MB 123/456" because it ends with an LTR run. In order to solve this,
  // we mark the total string as an LTR string if the UI layout is
  // right-to-left so that the string "456 MB" is treated as an LTR run.
  string16 simple_total = base::i18n::GetDisplayStringInLTRDirectionality(
      ui::FormatBytesWithUnits(total, amount_units, true));

  // TODO(asanka): Calculate a TimeRemaining() for GData uploads.
  TimeDelta remaining;
  string16 simple_time;
  if (download_->IsInProgress() && download_->IsPaused()) {
    simple_time = l10n_util::GetStringUTF16(IDS_DOWNLOAD_PROGRESS_PAUSED);
  } else if (!is_gdata && download_->TimeRemaining(&remaining)) {
    simple_time = download_->GetOpenWhenComplete() ?
                      TimeFormat::TimeRemainingShort(remaining) :
                      TimeFormat::TimeRemaining(remaining);
  }

  string16 status_text;
  switch (download_->GetState()) {
    case DownloadItem::IN_PROGRESS:
#if defined(OS_CHROMEOS)
      if (is_gdata && size == 0) {
        // We haven't started the upload yet. The download needs to progress
        // further before we will see any upload progress. Show "Downloading..."
        // until we start uploading.
        status_text = l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_WAITING);
        break;
      }
#endif
      if (ChromeDownloadManagerDelegate::IsExtensionDownload(download_) &&
          download_->AllDataSaved() &&
          download_->GetState() == DownloadItem::IN_PROGRESS) {
        // The download is a CRX (app, extension, theme, ...) and it is
        // being unpacked and validated.
        status_text = l10n_util::GetStringUTF16(
            IDS_DOWNLOAD_STATUS_CRX_INSTALL_RUNNING);
      } else if (download_->GetOpenWhenComplete()) {
        if (simple_time.empty()) {
          status_text =
              l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_OPEN_WHEN_COMPLETE);
        } else {
          status_text = l10n_util::GetStringFUTF16(IDS_DOWNLOAD_STATUS_OPEN_IN,
                                                   simple_time);
        }
      } else {
        if (!simple_time.empty()) {
          status_text = l10n_util::GetStringFUTF16(
              IDS_DOWNLOAD_STATUS_IN_PROGRESS, simple_size, simple_total,
              simple_time);
        } else if (total > 0 && size > 0) {
          status_text = l10n_util::GetStringFUTF16(
              IDS_DOWNLOAD_STATUS_IN_PROGRESS_SIZES_ONLY,
              simple_size, simple_total);
        } else {
          // Instead of displaying "0 B" we keep the "Starting..." string.
          status_text = (size == 0)
              ? l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_STARTING)
              : ui::FormatBytes(size);
        }
      }
      break;
    case DownloadItem::COMPLETE:
      if (download_->GetFileExternallyRemoved()) {
        status_text = l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_REMOVED);
      } else {
        status_text.clear();
      }
      break;
    case DownloadItem::CANCELLED:
      status_text = l10n_util::GetStringUTF16(IDS_DOWNLOAD_STATUS_CANCELED);
      break;
    case DownloadItem::REMOVING:
      break;
    case DownloadItem::INTERRUPTED:
      status_text = l10n_util::GetStringFUTF16(IDS_DOWNLOAD_STATUS_INTERRUPTED,
                                               simple_size,
                                               simple_total);
      break;
    default:
      NOTREACHED();
  }

  return status_text;
}

int DownloadItemModel::PercentComplete() const {
#if defined(OS_CHROMEOS)
  // For GData uploads, progress is based on the number of bytes
  // uploaded. Progress is unknown until the upload starts.
  if (gdata::GDataDownloadObserver::IsGDataDownload(download_))
    return gdata::GDataDownloadObserver::PercentComplete(download_);
#endif
  return download_->PercentComplete();
}

string16 DownloadItemModel::GetWarningText(const gfx::Font& font,
                                           int base_width) {
  // Should only be called if IsDangerous().
  DCHECK(IsDangerous());
  switch (download_->GetDangerType()) {
    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL:
      return l10n_util::GetStringUTF16(IDS_PROMPT_MALICIOUS_DOWNLOAD_URL);

    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE:
      if (ChromeDownloadManagerDelegate::IsExtensionDownload(download_)) {
        return l10n_util::GetStringUTF16(
            IDS_PROMPT_DANGEROUS_DOWNLOAD_EXTENSION);
      } else {
        return l10n_util::GetStringFUTF16(
            IDS_PROMPT_DANGEROUS_DOWNLOAD,
            ui::ElideFilename(download_->GetFileNameToReportUser(),
                              font, base_width));
      }

    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT:
      return l10n_util::GetStringFUTF16(
          IDS_PROMPT_MALICIOUS_DOWNLOAD_CONTENT,
          ui::ElideFilename(download_->GetFileNameToReportUser(),
                            font, base_width));

    case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT:
      return l10n_util::GetStringFUTF16(
          IDS_PROMPT_UNCOMMON_DOWNLOAD_CONTENT,
          ui::ElideFilename(download_->GetFileNameToReportUser(),
                            font, base_width));

    case content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS:
    case content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT:
    case content::DOWNLOAD_DANGER_TYPE_MAX:
      NOTREACHED();
  }
  return string16();
}

string16 DownloadItemModel::GetWarningConfirmButtonText() {
  // Should only be called if IsDangerous()
  DCHECK(IsDangerous());
  if (download_->GetDangerType() ==
          content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE &&
      ChromeDownloadManagerDelegate::IsExtensionDownload(download_)) {
    return l10n_util::GetStringUTF16(IDS_CONTINUE_EXTENSION_DOWNLOAD);
  } else {
    return l10n_util::GetStringUTF16(IDS_CONFIRM_DOWNLOAD);
  }
}

bool DownloadItemModel::IsMalicious() {
  if (!IsDangerous())
    return false;
  switch (download_->GetDangerType()) {
    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_URL:
    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_CONTENT:
    case content::DOWNLOAD_DANGER_TYPE_UNCOMMON_CONTENT:
      return true;

    case content::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS:
    case content::DOWNLOAD_DANGER_TYPE_MAYBE_DANGEROUS_CONTENT:
    case content::DOWNLOAD_DANGER_TYPE_MAX:
      // We shouldn't get any of these due to the IsDangerous() test above.
      NOTREACHED();
      // Fallthrough.
    case content::DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE:
      return false;
  }
  NOTREACHED();
  return false;
}

bool DownloadItemModel::IsDangerous() {
  return download_->GetSafetyState() == DownloadItem::DANGEROUS;
}