// Copyright (c) 2010 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/browsing_data_database_helper.h"

#include "base/callback.h"
#include "base/file_util.h"
#include "base/message_loop.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/browser_thread.h"
#include "chrome/browser/profiles/profile.h"
#include "net/base/net_errors.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebCString.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"

BrowsingDataDatabaseHelper::BrowsingDataDatabaseHelper(Profile* profile)
    : tracker_(profile->GetDatabaseTracker()),
      completion_callback_(NULL),
      is_fetching_(false) {
}

BrowsingDataDatabaseHelper::~BrowsingDataDatabaseHelper() {
}

void BrowsingDataDatabaseHelper::StartFetching(
    Callback1<const std::vector<DatabaseInfo>& >::Type* callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  DCHECK(!is_fetching_);
  DCHECK(callback);
  is_fetching_ = true;
  database_info_.clear();
  completion_callback_.reset(callback);
  BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, NewRunnableMethod(
      this, &BrowsingDataDatabaseHelper::FetchDatabaseInfoInFileThread));
}

void BrowsingDataDatabaseHelper::CancelNotification() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  completion_callback_.reset(NULL);
}

void BrowsingDataDatabaseHelper::DeleteDatabase(const std::string& origin,
                                                const std::string& name) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, NewRunnableMethod(
      this, &BrowsingDataDatabaseHelper::DeleteDatabaseInFileThread, origin,
      name));
}

void BrowsingDataDatabaseHelper::FetchDatabaseInfoInFileThread() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  std::vector<webkit_database::OriginInfo> origins_info;
  if (tracker_.get() && tracker_->GetAllOriginsInfo(&origins_info)) {
    for (std::vector<webkit_database::OriginInfo>::const_iterator ori =
         origins_info.begin(); ori != origins_info.end(); ++ori) {
      const std::string origin_identifier(UTF16ToUTF8(ori->GetOrigin()));
      if (StartsWithASCII(origin_identifier,
                          std::string(chrome::kExtensionScheme),
                          true)) {
        // Extension state is not considered browsing data.
        continue;
      }
      WebKit::WebSecurityOrigin web_security_origin =
          WebKit::WebSecurityOrigin::createFromDatabaseIdentifier(
              ori->GetOrigin());
      std::vector<string16> databases;
      ori->GetAllDatabaseNames(&databases);
      for (std::vector<string16>::const_iterator db = databases.begin();
           db != databases.end(); ++db) {
        FilePath file_path = tracker_->GetFullDBFilePath(ori->GetOrigin(), *db);
        base::PlatformFileInfo file_info;
        if (file_util::GetFileInfo(file_path, &file_info)) {
          database_info_.push_back(DatabaseInfo(
                web_security_origin.host().utf8(),
                UTF16ToUTF8(*db),
                origin_identifier,
                UTF16ToUTF8(ori->GetDatabaseDescription(*db)),
                web_security_origin.toString().utf8(),
                file_info.size,
                file_info.last_modified));
        }
      }
    }
  }

  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, NewRunnableMethod(
      this, &BrowsingDataDatabaseHelper::NotifyInUIThread));
}

void BrowsingDataDatabaseHelper::NotifyInUIThread() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  DCHECK(is_fetching_);
  // Note: completion_callback_ mutates only in the UI thread, so it's safe to
  // test it here.
  if (completion_callback_ != NULL) {
    completion_callback_->Run(database_info_);
    completion_callback_.reset();
  }
  is_fetching_ = false;
  database_info_.clear();
}

void BrowsingDataDatabaseHelper::DeleteDatabaseInFileThread(
    const std::string& origin,
    const std::string& name) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  if (!tracker_.get())
    return;
  tracker_->DeleteDatabase(UTF8ToUTF16(origin), UTF8ToUTF16(name), NULL);
}

CannedBrowsingDataDatabaseHelper::CannedBrowsingDataDatabaseHelper(
    Profile* profile)
    : BrowsingDataDatabaseHelper(profile) {
}

void CannedBrowsingDataDatabaseHelper::AddDatabase(
    const GURL& origin,
    const std::string& name,
    const std::string& description) {
  WebKit::WebSecurityOrigin web_security_origin =
      WebKit::WebSecurityOrigin::createFromString(
          UTF8ToUTF16(origin.spec()));
  std::string origin_identifier =
      web_security_origin.databaseIdentifier().utf8();

  for (std::vector<DatabaseInfo>::iterator database = database_info_.begin();
       database != database_info_.end(); ++database) {
    if (database->origin_identifier == origin_identifier &&
        database->database_name == name)
      return;
  }

  database_info_.push_back(DatabaseInfo(
        web_security_origin.host().utf8(),
        name,
        origin_identifier,
        description,
        web_security_origin.toString().utf8(),
        0,
        base::Time()));
}

void CannedBrowsingDataDatabaseHelper::Reset() {
  database_info_.clear();
}

bool CannedBrowsingDataDatabaseHelper::empty() const {
 return database_info_.empty();
}

void CannedBrowsingDataDatabaseHelper::StartFetching(
    Callback1<const std::vector<DatabaseInfo>& >::Type* callback) {
  callback->Run(database_info_);
  delete callback;
}