/* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_places_SQLFunctions_h_
#define mozilla_places_SQLFunctions_h_

/**
 * This file contains functions that Places adds to the database handle that can
 * be accessed by SQL queries.
 *
 * Keep the GUID-related parts of this file in sync with
 * toolkit/downloads/SQLFunctions.[h|cpp]!
 */

#include "mozIStorageFunction.h"
#include "mozilla/Attributes.h"

class mozIStorageConnection;

namespace mozilla {
namespace places {

////////////////////////////////////////////////////////////////////////////////
//// AutoComplete Matching Function

/**
 * This function is used to determine if a given set of data should match an
 * AutoComplete query.
 *
 * In SQL, you'd use it in the WHERE clause like so:
 * WHERE AUTOCOMPLETE_MATCH(aSearchString, aURL, aTitle, aTags, aVisitCount,
 *                          aTyped, aBookmark, aOpenPageCount, aMatchBehavior,
 *                          aSearchBehavior)
 *
 * @param aSearchString
 *        The string to compare against.
 * @param aURL
 *        The URL to test for an AutoComplete match.
 * @param aTitle
 *        The title to test for an AutoComplete match.
 * @param aTags
 *        The tags to test for an AutoComplete match.
 * @param aVisitCount
 *        The number of visits aURL has.
 * @param aTyped
 *        Indicates if aURL is a typed URL or not.  Treated as a boolean.
 * @param aBookmark
 *        Indicates if aURL is a bookmark or not.  Treated as a boolean.
 * @param aOpenPageCount
 *        The number of times aURL has been registered as being open.  (See
 *        UrlbarProviderOpenTabs::registerOpenTab.)
 * @param aMatchBehavior
 *        The match behavior to use for this search.
 * @param aSearchBehavior
 *        A bitfield dictating the search behavior.
 */
class MatchAutoCompleteFunction final : public mozIStorageFunction {
 public:
  MatchAutoCompleteFunction();

  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~MatchAutoCompleteFunction() = default;

  /**
   * IntegerVariants for 0 and 1 are frequently used in awesomebar queries,
   * so we cache them to avoid allocating memory repeatedly.
   */
  nsCOMPtr<nsIVariant> mCachedZero;
  nsCOMPtr<nsIVariant> mCachedOne;

  /**
   * Argument Indexes
   */
  static const uint32_t kArgSearchString = 0;
  static const uint32_t kArgIndexURL = 1;
  static const uint32_t kArgIndexTitle = 2;
  static const uint32_t kArgIndexTags = 3;
  static const uint32_t kArgIndexVisitCount = 4;
  static const uint32_t kArgIndexTyped = 5;
  static const uint32_t kArgIndexBookmark = 6;
  static const uint32_t kArgIndexOpenPageCount = 7;
  static const uint32_t kArgIndexMatchBehavior = 8;
  static const uint32_t kArgIndexSearchBehavior = 9;
  static const uint32_t kArgIndexLength = 10;

  /**
   * Typedefs
   */
  typedef bool (*searchFunctionPtr)(const nsDependentCSubstring& aToken,
                                    const nsACString& aSourceString);

  typedef nsACString::const_char_iterator const_char_iterator;

  /**
   * Obtains the search function to match on.
   *
   * @param aBehavior
   *        The matching behavior to use defined by one of the
   *        mozIPlacesAutoComplete::MATCH_* values.
   * @return a pointer to the function that will perform the proper search.
   */
  static searchFunctionPtr getSearchFunction(int32_t aBehavior);

  /**
   * Tests if aSourceString starts with aToken.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findBeginning(const nsDependentCSubstring& aToken,
                            const nsACString& aSourceString);

  /**
   * Tests if aSourceString starts with aToken in a case sensitive way.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findBeginningCaseSensitive(const nsDependentCSubstring& aToken,
                                         const nsACString& aSourceString);

  /**
   * Searches aSourceString for aToken anywhere in the string in a case-
   * insensitive way.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findAnywhere(const nsDependentCSubstring& aToken,
                           const nsACString& aSourceString);

  /**
   * Tests if aToken is found on a word boundary in aSourceString.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findOnBoundary(const nsDependentCSubstring& aToken,
                             const nsACString& aSourceString);

  /**
   * Fixes a URI's spec such that it is ready to be searched.  This includes
   * unescaping escaped characters and removing certain specs that we do not
   * care to search for.
   *
   * @param aURISpec
   *        The spec of the URI to prepare for searching.
   * @param aMatchBehavior
   *        The matching behavior to use defined by one of the
   *        mozIPlacesAutoComplete::MATCH_* values.
   * @param aSpecBuf
   *        A string buffer that the returned slice can point into, if needed.
   * @return the fixed up string.
   */
  static nsDependentCSubstring fixupURISpec(const nsACString& aURISpec,
                                            int32_t aMatchBehavior,
                                            nsACString& aSpecBuf);
};

////////////////////////////////////////////////////////////////////////////////
//// Frecency Calculation Function

/**
 * This function is used to calculate frecency for a page.
 *
 * In SQL, you'd use it in when setting frecency like:
 * SET frecency = CALCULATE_FRECENCY(place_id).
 * Optional parameters must be passed in if the page is not yet in the database,
 * otherwise they will be fetched from it automatically.
 *
 * @param {int64_t} pageId
 *        The id of the page.  Pass -1 if the page is being added right now.
 * @param [optional] {int32_t} useRedirectBonus
 *        Whether we should use the lower redirect bonus for the most recent
 *        page visit.  If not passed in, it will use a database guess.
 */
class CalculateFrecencyFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~CalculateFrecencyFunction() = default;
};

/**
 * SQL function to generate a GUID for a place or bookmark item.  This is just
 * a wrapper around GenerateGUID in Helpers.h.
 *
 * @return a guid for the item.
 */
class GenerateGUIDFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~GenerateGUIDFunction() = default;
};

/**
 * SQL function to check if a GUID is valid.  This is just a wrapper around
 * IsValidGUID in Helpers.h.
 *
 * @return true if valid, false otherwise.
 */
class IsValidGUIDFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~IsValidGUIDFunction() = default;
};

/**
 * SQL function to unreverse the rev_host of a page.
 *
 * @param rev_host
 *        The rev_host value of the page.
 *
 * @return the unreversed host of the page.
 */
class GetUnreversedHostFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~GetUnreversedHostFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Fixup URL Function

/**
 * Make a given URL more suitable for searches, by removing common prefixes
 * such as "www."
 *
 * @param url
 *        A URL.
 * @return
 *        The same URL, with redundant parts removed.
 */
class FixupURLFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~FixupURLFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Frecency Changed Notification Function

/**
 * For a given place, posts a runnable to the main thread that calls
 * onFrecencyChanged on nsNavHistory's nsINavHistoryObservers.  The passed-in
 * newFrecency value is returned unchanged.
 *
 * @param newFrecency
 *        The place's new frecency.
 * @param url
 *        The place's URL.
 * @param guid
 *        The place's GUID.
 * @param hidden
 *        The place's hidden boolean.
 * @param lastVisitDate
 *        The place's last visit date.
 * @return newFrecency
 */
class FrecencyNotificationFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~FrecencyNotificationFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Store Last Inserted Id Function

/**
 * Store the last inserted id for reference purpose.
 *
 * @param tableName
 *        The table name.
 * @param id
 *        The last inserted id.
 * @return null
 */
class StoreLastInsertedIdFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~StoreLastInsertedIdFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Hash Function

/**
 * Calculates hash for a given string using the mfbt AddToHash function.
 *
 * @param string
 *        A string.
 * @return
 *        The hash for the string.
 */
class HashFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~HashFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Get Query Param Function

/**
 * Extracts and returns the value of a parameter from a query string.
 *
 * @param string
 *        A string.
 * @return
 *        The value of the query parameter as a string, or NULL if not set.
 */
class GetQueryParamFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~GetQueryParamFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Get prefix function

/**
 * Gets the length of the prefix in a URL.  "Prefix" is defined to be the
 * scheme, colon, and, if present, two slashes.
 *
 * @param url
 *        A URL, or a string that may be a URL.
 * @return
 *        If `url` is actually a URL and has a prefix, then this returns the
 *        prefix.  Otherwise this returns an empty string.
 */
class GetPrefixFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~GetPrefixFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Get host and port function

/**
 * Gets the host and port substring of a URL.
 *
 * @param url
 *        A URL, or a string that may be a URL.
 * @return
 *        If `url` is actually a URL, or if it's a URL without the prefix, then
 *        this returns the host and port substring of the URL.  Otherwise, this
 *        returns `url` itself.
 */
class GetHostAndPortFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~GetHostAndPortFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Strip prefix function

/**
 * Gets the part of a URL after its prefix and userinfo; i.e., the substring
 * starting at the host.
 *
 * @param url
 *        A URL, or a string that may be a URL.
 * @return
 *        If `url` is actually a URL, or if it's a URL without the prefix, then
 *        this returns the substring starting at the host.  Otherwise, this
 *        returns `url` itself.
 */
class StripPrefixAndUserinfoFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~StripPrefixAndUserinfoFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Is frecency decaying function

/**
 * Returns nsNavHistory::IsFrecencyDecaying().
 *
 * @return
 *        True if frecency is currently decaying and false otherwise.
 */
class IsFrecencyDecayingFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~IsFrecencyDecayingFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// sqrt function

/**
 * Gets the square root of a given value.
 */
class SqrtFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~SqrtFunction() = default;
};

////////////////////////////////////////////////////////////////////////////////
//// Note Sync Change Function

/**
 * Bumps the global Sync change counter. See the comment above
 * `totalSyncChanges` in `nsINavBookmarksService` for a more detailed
 * explanation.
 */
class NoteSyncChangeFunction final : public mozIStorageFunction {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection* aDBConn);

 private:
  ~NoteSyncChangeFunction() = default;
};

}  // namespace places
}  // namespace mozilla

#endif  // mozilla_places_SQLFunctions_h_