// 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/chromeos/cros/cellular_data_plan.h"

#include "base/i18n/time_formatting.h"
#include "base/string_number_conversions.h"
#include "base/utf_string_conversions.h"
#include "chrome/common/time_format.h"
#include "grit/generated_resources.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/text/bytes_formatting.h"

namespace chromeos {

// Cellular network is considered low data when less than 60 minues.
const int kCellularDataLowSecs = 60 * 60;

// Cellular network is considered low data when less than 30 minues.
const int kCellularDataVeryLowSecs = 30 * 60;

// Cellular network is considered low data when less than 100MB.
const int kCellularDataLowBytes = 100 * 1024 * 1024;

// Cellular network is considered very low data when less than 50MB.
const int kCellularDataVeryLowBytes = 50 * 1024 * 1024;

CellularDataPlan::CellularDataPlan()
    : plan_name("Unknown"),
      plan_type(CELLULAR_DATA_PLAN_UNLIMITED),
      plan_data_bytes(0),
      data_bytes_used(0) {
}

CellularDataPlan::~CellularDataPlan() {}

string16 CellularDataPlan::GetPlanDesciption() const {
  switch (plan_type) {
    case chromeos::CELLULAR_DATA_PLAN_UNLIMITED: {
      return l10n_util::GetStringFUTF16(
          IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PURCHASE_UNLIMITED_DATA,
          base::TimeFormatFriendlyDate(plan_start_time));
      break;
    }
    case chromeos::CELLULAR_DATA_PLAN_METERED_PAID: {
      return l10n_util::GetStringFUTF16(
                IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_PURCHASE_DATA,
                ui::FormatBytes(plan_data_bytes),
                base::TimeFormatFriendlyDate(plan_start_time));
    }
    case chromeos::CELLULAR_DATA_PLAN_METERED_BASE: {
      return l10n_util::GetStringFUTF16(
                IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_RECEIVED_FREE_DATA,
                ui::FormatBytes(plan_data_bytes),
                base::TimeFormatFriendlyDate(plan_start_time));
    default:
      break;
    }
  }
  return string16();
}

string16 CellularDataPlan::GetRemainingWarning() const {
  if (plan_type == chromeos::CELLULAR_DATA_PLAN_UNLIMITED) {
    // Time based plan. Show nearing expiration and data expiration.
    if (remaining_time().InSeconds() <= chromeos::kCellularDataVeryLowSecs) {
      return GetPlanExpiration();
    }
  } else if (plan_type == chromeos::CELLULAR_DATA_PLAN_METERED_PAID ||
             plan_type == chromeos::CELLULAR_DATA_PLAN_METERED_BASE) {
    // Metered plan. Show low data and out of data.
    if (remaining_data() <= chromeos::kCellularDataVeryLowBytes) {
      int64 remaining_mbytes = remaining_data() / (1024 * 1024);
      return l10n_util::GetStringFUTF16(
          IDS_NETWORK_DATA_REMAINING_MESSAGE,
          UTF8ToUTF16(base::Int64ToString(remaining_mbytes)));
    }
  }
  return string16();
}

string16 CellularDataPlan::GetDataRemainingDesciption() const {
  int64 remaining_bytes = remaining_data();
  switch (plan_type) {
    case chromeos::CELLULAR_DATA_PLAN_UNLIMITED: {
      return l10n_util::GetStringUTF16(
          IDS_OPTIONS_SETTINGS_INTERNET_OPTIONS_UNLIMITED);
    }
    case chromeos::CELLULAR_DATA_PLAN_METERED_PAID: {
      return ui::FormatBytes(remaining_bytes);
    }
    case chromeos::CELLULAR_DATA_PLAN_METERED_BASE: {
      return ui::FormatBytes(remaining_bytes);
    }
    default:
      break;
  }
  return string16();
}

string16 CellularDataPlan::GetUsageInfo() const {
  if (plan_type == chromeos::CELLULAR_DATA_PLAN_UNLIMITED) {
    // Time based plan. Show nearing expiration and data expiration.
    return GetPlanExpiration();
  } else if (plan_type == chromeos::CELLULAR_DATA_PLAN_METERED_PAID ||
             plan_type == chromeos::CELLULAR_DATA_PLAN_METERED_BASE) {
    // Metered plan. Show low data and out of data.
    int64 remaining_bytes = remaining_data();
    if (remaining_bytes == 0) {
      return l10n_util::GetStringUTF16(
          IDS_NETWORK_DATA_NONE_AVAILABLE_MESSAGE);
    } else if (remaining_bytes < 1024 * 1024) {
      return l10n_util::GetStringUTF16(
          IDS_NETWORK_DATA_LESS_THAN_ONE_MB_AVAILABLE_MESSAGE);
    } else {
      int64 remaining_mb = remaining_bytes / (1024 * 1024);
      return l10n_util::GetStringFUTF16(
          IDS_NETWORK_DATA_MB_AVAILABLE_MESSAGE,
          UTF8ToUTF16(base::Int64ToString(remaining_mb)));
    }
  }
  return string16();
}

std::string CellularDataPlan::GetUniqueIdentifier() const {
  // A cellular plan is uniquely described by the union of name, type,
  // start time, end time, and max bytes.
  // So we just return a union of all these variables.
  return plan_name + "|" +
      base::Int64ToString(plan_type) + "|" +
      base::Int64ToString(plan_start_time.ToInternalValue()) + "|" +
      base::Int64ToString(plan_end_time.ToInternalValue()) + "|" +
      base::Int64ToString(plan_data_bytes);
}

base::TimeDelta CellularDataPlan::remaining_time() const {
  base::TimeDelta time = plan_end_time - base::Time::Now();
  return time.InMicroseconds() < 0 ? base::TimeDelta() : time;
}

int64 CellularDataPlan::remaining_minutes() const {
  return remaining_time().InMinutes();
}

int64 CellularDataPlan::remaining_data() const {
  int64 data = plan_data_bytes - data_bytes_used;
  return data < 0 ? 0 : data;
}

string16 CellularDataPlan::GetPlanExpiration() const {
  return TimeFormat::TimeRemaining(remaining_time());
}

}  // namespace chromeos