// 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/webui/quota_internals_proxy.h"

#include <set>
#include <string>

#include "base/bind.h"
#include "chrome/browser/ui/webui/quota_internals_handler.h"
#include "chrome/browser/ui/webui/quota_internals_types.h"
#include "net/base/net_util.h"

using content::BrowserThread;

namespace quota_internals {

QuotaInternalsProxy::QuotaInternalsProxy(QuotaInternalsHandler* handler)
    : handler_(handler),
      weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}

QuotaInternalsProxy::~QuotaInternalsProxy() {}

#define RELAY_TO_HANDLER(func, arg_t) \
  void QuotaInternalsProxy::func(arg_t arg) {                 \
    if (!handler_)                                            \
      return;                                                 \
    if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {     \
      BrowserThread::PostTask(                                \
          BrowserThread::UI, FROM_HERE,                       \
          base::Bind(&QuotaInternalsProxy::func, this, arg)); \
      return;                                                 \
    }                                                         \
                                                              \
    handler_->func(arg);                                      \
  }

RELAY_TO_HANDLER(ReportAvailableSpace, int64)
RELAY_TO_HANDLER(ReportGlobalInfo, const GlobalStorageInfo&)
RELAY_TO_HANDLER(ReportPerHostInfo, const std::vector<PerHostStorageInfo>&)
RELAY_TO_HANDLER(ReportPerOriginInfo, const std::vector<PerOriginStorageInfo>&)
RELAY_TO_HANDLER(ReportStatistics, const Statistics&)

#undef RELAY_TO_HANDLER

void QuotaInternalsProxy::RequestInfo(
    scoped_refptr<quota::QuotaManager> quota_manager) {
  DCHECK(quota_manager);
  if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&QuotaInternalsProxy::RequestInfo, this, quota_manager));
    return;
  }

  quota_manager_ = quota_manager;
  quota_manager_->GetAvailableSpace(
      base::Bind(&QuotaInternalsProxy::DidGetAvailableSpace,
                 weak_factory_.GetWeakPtr()));

  quota_manager_->GetTemporaryGlobalQuota(
      base::Bind(&QuotaInternalsProxy::DidGetGlobalQuota,
                 weak_factory_.GetWeakPtr()));

  quota_manager_->GetGlobalUsage(
      quota::kStorageTypeTemporary,
      base::Bind(&QuotaInternalsProxy::DidGetGlobalUsage,
                 weak_factory_.GetWeakPtr()));

  quota_manager_->GetGlobalUsage(
      quota::kStorageTypePersistent,
      base::Bind(&QuotaInternalsProxy::DidGetGlobalUsage,
                 weak_factory_.GetWeakPtr()));

  quota_manager_->DumpQuotaTable(
      base::Bind(&QuotaInternalsProxy::DidDumpQuotaTable,
                 weak_factory_.GetWeakPtr()));

  quota_manager_->DumpOriginInfoTable(
      base::Bind(&QuotaInternalsProxy::DidDumpOriginInfoTable,
                 weak_factory_.GetWeakPtr()));

  std::map<std::string, std::string> stats;
  quota_manager_->GetStatistics(&stats);
  ReportStatistics(stats);
}

void QuotaInternalsProxy::DidGetAvailableSpace(quota::QuotaStatusCode status,
                                               int64 space) {
  if (status == quota::kQuotaStatusOk)
    ReportAvailableSpace(space);
}

void QuotaInternalsProxy::DidGetGlobalQuota(quota::QuotaStatusCode status,
                                            quota::StorageType type,
                                            int64 quota) {
  if (status == quota::kQuotaStatusOk) {
    GlobalStorageInfo info(type);
    info.set_quota(quota);
    ReportGlobalInfo(info);
  }
}

void QuotaInternalsProxy::DidGetGlobalUsage(quota::StorageType type,
                                            int64 usage,
                                            int64 unlimited_usage) {
  GlobalStorageInfo info(type);
  info.set_usage(usage);
  info.set_unlimited_usage(unlimited_usage);

  ReportGlobalInfo(info);
  RequestPerOriginInfo(type);
}

void QuotaInternalsProxy::DidDumpQuotaTable(const QuotaTableEntries& entries) {
  std::vector<PerHostStorageInfo> host_info;
  host_info.reserve(entries.size());

  typedef QuotaTableEntries::const_iterator iterator;
  for (iterator itr(entries.begin()); itr != entries.end(); ++itr) {
    PerHostStorageInfo info(itr->host, itr->type);
    info.set_quota(itr->quota);
    host_info.push_back(info);
  }

  ReportPerHostInfo(host_info);
}

void QuotaInternalsProxy::DidDumpOriginInfoTable(
    const OriginInfoTableEntries& entries) {
  std::vector<PerOriginStorageInfo> origin_info;
  origin_info.reserve(entries.size());

  typedef OriginInfoTableEntries::const_iterator iterator;
  for (iterator itr(entries.begin()); itr != entries.end(); ++itr) {
    PerOriginStorageInfo info(itr->origin, itr->type);
    info.set_used_count(itr->used_count);
    info.set_last_access_time(itr->last_access_time);
    info.set_last_modified_time(itr->last_modified_time);

    origin_info.push_back(info);
  }

  ReportPerOriginInfo(origin_info);
}

void QuotaInternalsProxy::DidGetHostUsage(const std::string& host,
                                          quota::StorageType type,
                                          int64 usage) {
  DCHECK(type == quota::kStorageTypeTemporary ||
         type == quota::kStorageTypePersistent);

  PerHostStorageInfo info(host, type);
  info.set_usage(usage);

  report_pending_.push_back(info);
  hosts_pending_.erase(make_pair(host, type));
  if (report_pending_.size() >= 10 || hosts_pending_.empty()) {
    ReportPerHostInfo(report_pending_);
    report_pending_.clear();
  }

  if (!hosts_pending_.empty())
    GetHostUsage(hosts_pending_.begin()->first,
                 hosts_pending_.begin()->second);
}

void QuotaInternalsProxy::VisitHost(const std::string& host,
                                    quota::StorageType type) {
  if (hosts_visited_.insert(std::make_pair(host, type)).second) {
    hosts_pending_.insert(std::make_pair(host, type));
    if (hosts_pending_.size() == 1) {
      GetHostUsage(host, type);
    }
  }
}

void QuotaInternalsProxy::GetHostUsage(const std::string& host,
                                       quota::StorageType type) {
  DCHECK(quota_manager_);
  quota_manager_->GetHostUsage(
      host, type,
      base::Bind(&QuotaInternalsProxy::DidGetHostUsage,
                 weak_factory_.GetWeakPtr()));
}

void QuotaInternalsProxy::RequestPerOriginInfo(quota::StorageType type) {
  DCHECK(quota_manager_);

  std::set<GURL> origins;
  quota_manager_->GetCachedOrigins(type, &origins);

  std::vector<PerOriginStorageInfo> origin_info;
  origin_info.reserve(origins.size());

  std::set<std::string> hosts;
  std::vector<PerHostStorageInfo> host_info;

  for (std::set<GURL>::iterator itr(origins.begin());
       itr != origins.end(); ++itr) {
    PerOriginStorageInfo info(*itr, type);
    info.set_in_use(quota_manager_->IsOriginInUse(*itr));
    origin_info.push_back(info);

    std::string host(net::GetHostOrSpecFromURL(*itr));
    if (hosts.insert(host).second) {
      PerHostStorageInfo info(host, type);
      host_info.push_back(info);
      VisitHost(host, type);
    }
  }
  ReportPerOriginInfo(origin_info);
  ReportPerHostInfo(host_info);
}

}  // namespace quota_internals