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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * 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/. */

#include "nsPlacesTables.h"

#ifndef __nsPlacesTriggers_h__
#define __nsPlacesTriggers_h__

/**
 * Exclude these visit types:
 *  0 - invalid
 *  4 - EMBED
 *  7 - DOWNLOAD
 *  8 - FRAMED_LINK
 *  9 - RELOAD
 **/
#define EXCLUDED_VISIT_TYPES "0, 4, 7, 8, 9"

/**
 * This triggers update visit_count and last_visit_date based on historyvisits
 * table changes.
 */
#define CREATE_HISTORYVISITS_AFTERINSERT_TRIGGER                           \
  NS_LITERAL_CSTRING(                                                      \
      "CREATE TEMP TRIGGER moz_historyvisits_afterinsert_v2_trigger "      \
      "AFTER INSERT ON moz_historyvisits FOR EACH ROW "                    \
      "BEGIN "                                                             \
      "SELECT store_last_inserted_id('moz_historyvisits', NEW.id); "       \
      "UPDATE moz_places SET "                                             \
      "visit_count = visit_count + (SELECT NEW.visit_type NOT IN "         \
      "(" EXCLUDED_VISIT_TYPES                                             \
      ")), "                                                               \
      "last_visit_date = MAX(IFNULL(last_visit_date, 0), NEW.visit_date) " \
      "WHERE id = NEW.place_id;"                                           \
      "END")

#define CREATE_HISTORYVISITS_AFTERDELETE_TRIGGER                      \
  NS_LITERAL_CSTRING(                                                 \
      "CREATE TEMP TRIGGER moz_historyvisits_afterdelete_v2_trigger " \
      "AFTER DELETE ON moz_historyvisits FOR EACH ROW "               \
      "BEGIN "                                                        \
      "UPDATE moz_places SET "                                        \
      "visit_count = visit_count - (SELECT OLD.visit_type NOT IN "    \
      "(" EXCLUDED_VISIT_TYPES                                        \
      ")), "                                                          \
      "last_visit_date = (SELECT visit_date FROM moz_historyvisits "  \
      "WHERE place_id = OLD.place_id "                                \
      "ORDER BY visit_date DESC LIMIT 1) "                            \
      "WHERE id = OLD.place_id;"                                      \
      "END")

/**
 * A predicate matching pages on rev_host, based on a given host value.
 * 'host' may be either the moz_hosts.host column or an alias representing an
 * equivalent value.
 */
#define HOST_TO_REVHOST_PREDICATE                       \
  "rev_host = get_unreversed_host(host || '.') || '.' " \
  "OR rev_host = get_unreversed_host(host || '.') || '.www.'"

#define OLDHOST_TO_REVHOST_PREDICATE                        \
  "rev_host = get_unreversed_host(OLD.host || '.') || '.' " \
  "OR rev_host = get_unreversed_host(OLD.host || '.') || '.www.'"

/**
 * Select the best prefix for a host, based on existing pages registered for it.
 * Prefixes have a priority, from the top to the bottom, so that secure pages
 * have higher priority, and more generically "www." prefixed hosts come before
 * unprefixed ones.
 * Given a host, examine associated pages and:
 *  - if at least half the typed pages start with https://www. return
 * https://www.
 *  - if at least half the typed pages start with https:// return https://
 *  - if all of the typed pages start with ftp: return ftp://
 *     - This is because mostly people will want to visit the http version
 *       of the site.
 *  - if at least half the typed pages start with www. return www.
 *  - otherwise don't use any prefix
 */
#define HOSTS_PREFIX_PRIORITY_FRAGMENT                                      \
  "SELECT CASE "                                                            \
  "WHEN ( "                                                                 \
  "SELECT round(avg(substr(url,1,12) = 'https://www.')) FROM moz_places h " \
  "WHERE (" HOST_TO_REVHOST_PREDICATE                                       \
  ") AND +h.typed = 1 "                                                     \
  ") THEN 'https://www.' "                                                  \
  "WHEN ( "                                                                 \
  "SELECT round(avg(substr(url,1,8) = 'https://')) FROM moz_places h "      \
  "WHERE (" HOST_TO_REVHOST_PREDICATE                                       \
  ") AND +h.typed = 1 "                                                     \
  ") THEN 'https://' "                                                      \
  "WHEN 1 = ( "                                                             \
  "SELECT min(substr(url,1,4) = 'ftp:') FROM moz_places h "                 \
  "WHERE (" HOST_TO_REVHOST_PREDICATE                                       \
  ") AND +h.typed = 1 "                                                     \
  ") THEN 'ftp://' "                                                        \
  "WHEN ( "                                                                 \
  "SELECT round(avg(substr(url,1,11) = 'http://www.')) FROM moz_places h "  \
  "WHERE (" HOST_TO_REVHOST_PREDICATE                                       \
  ") AND +h.typed = 1 "                                                     \
  ") THEN 'www.' "                                                          \
  "END "

// The next few triggers are a workaround for the lack of FOR EACH STATEMENT in
// Sqlite, until bug 871908 can be fixed properly.
// While doing inserts or deletes into moz_places, we accumulate the affected
// hosts into a temp table. Afterwards, we delete everything from the temp
// table, causing the AFTER DELETE trigger to fire for it, which will then
// update the moz_hosts table.
// Note this way we lose atomicity, crashing between the 2 queries may break the
// hosts table coherency. So it's better to run those DELETE queries in a single
// transaction.
// Regardless, this is still better than hanging the browser for several minutes
// on a fast machine.
#define CREATE_PLACES_AFTERINSERT_TRIGGER                       \
  NS_LITERAL_CSTRING(                                           \
      "CREATE TEMP TRIGGER moz_places_afterinsert_trigger "     \
      "AFTER INSERT ON moz_places FOR EACH ROW "                \
      "BEGIN "                                                  \
      "SELECT store_last_inserted_id('moz_places', NEW.id); "   \
      "INSERT OR IGNORE INTO moz_updatehostsinsert_temp (host)" \
      "VALUES (fixup_url(get_unreversed_host(NEW.rev_host)));"  \
      "END")

// See CREATE_PLACES_AFTERINSERT_TRIGGER. For each delete in moz_places we
// add the host to moz_updatehostsdelete_temp - we then delete everything
// from moz_updatehostsdelete_temp, allowing us to run a trigger only once
// per host.
#define CREATE_PLACES_AFTERDELETE_TRIGGER                       \
  NS_LITERAL_CSTRING(                                           \
      "CREATE TEMP TRIGGER moz_places_afterdelete_trigger "     \
      "AFTER DELETE ON moz_places FOR EACH ROW "                \
      "BEGIN "                                                  \
      "INSERT OR IGNORE INTO moz_updatehostsdelete_temp (host)" \
      "VALUES (fixup_url(get_unreversed_host(OLD.rev_host)));"  \
      "END")

// See CREATE_PLACES_AFTERINSERT_TRIGGER. This is the trigger that we want
// to ensure gets run for each distinct host that we insert into moz_places.
#define CREATE_UPDATEHOSTSINSERT_AFTERDELETE_TRIGGER                          \
  NS_LITERAL_CSTRING(                                                         \
      "CREATE TEMP TRIGGER moz_updatehostsinsert_afterdelete_trigger "        \
      "AFTER DELETE ON moz_updatehostsinsert_temp FOR EACH ROW "              \
      "BEGIN "                                                                \
      "INSERT OR REPLACE INTO moz_hosts (id, host, frecency, typed, prefix) " \
      "SELECT "                                                               \
      "(SELECT id FROM moz_hosts WHERE host = OLD.host), "                    \
      "OLD.host, "                                                            \
      "MAX(IFNULL((SELECT frecency FROM moz_hosts WHERE host = OLD.host), "   \
      "-1), "                                                                 \
      "(SELECT MAX(frecency) FROM moz_places h "                              \
      "WHERE (" OLDHOST_TO_REVHOST_PREDICATE                                  \
      "))), "                                                                 \
      "MAX(IFNULL((SELECT typed FROM moz_hosts WHERE host = OLD.host), 0), "  \
      "(SELECT MAX(typed) FROM moz_places h "                                 \
      "WHERE (" OLDHOST_TO_REVHOST_PREDICATE                                  \
      "))), "                                                                 \
      "(" HOSTS_PREFIX_PRIORITY_FRAGMENT                                      \
      "FROM ( "                                                               \
      "SELECT OLD.host AS host "                                              \
      ")"                                                                     \
      ") "                                                                    \
      " WHERE LENGTH(OLD.host) > 1; "                                         \
      "END")

// See CREATE_PLACES_AFTERINSERT_TRIGGER. This is the trigger that we want
// to ensure gets run for each distinct host that we delete from moz_places.
#define CREATE_UPDATEHOSTSDELETE_AFTERDELETE_TRIGGER                     \
  NS_LITERAL_CSTRING(                                                    \
      "CREATE TEMP TRIGGER moz_updatehostsdelete_afterdelete_trigger "   \
      "AFTER DELETE ON moz_updatehostsdelete_temp FOR EACH ROW "         \
      "BEGIN "                                                           \
      "DELETE FROM moz_hosts "                                           \
      "WHERE host = OLD.host "                                           \
      "AND NOT EXISTS("                                                  \
      "SELECT 1 FROM moz_places "                                        \
      "WHERE rev_host = get_unreversed_host(host || '.') || '.' "        \
      "OR rev_host = get_unreversed_host(host || '.') || '.www.' "       \
      "); "                                                              \
      "UPDATE moz_hosts "                                                \
      "SET prefix = (" HOSTS_PREFIX_PRIORITY_FRAGMENT                    \
      ") "                                                               \
      "WHERE host = OLD.host; "                                          \
      "DELETE FROM moz_icons "                                           \
      "WHERE fixed_icon_url_hash = hash(fixup_url(OLD.host || "          \
      "'/favicon.ico')) "                                                \
      "AND fixup_url(icon_url) = fixup_url(OLD.host || '/favicon.ico') " \
      "AND NOT EXISTS (SELECT 1 FROM moz_hosts WHERE host = OLD.host "   \
      "OR host = fixup_url(OLD.host));"                                  \
      "END")

// For performance reasons the host frecency is updated only when the page
// frecency changes by a meaningful percentage.  This is because the frecency
// decay algorithm requires to update all the frecencies at once, causing a
// too high overhead, while leaving the ordering unchanged.
#define CREATE_PLACES_AFTERUPDATE_FRECENCY_TRIGGER                          \
  NS_LITERAL_CSTRING(                                                       \
      "CREATE TEMP TRIGGER moz_places_afterupdate_frecency_trigger "        \
      "AFTER UPDATE OF frecency ON moz_places FOR EACH ROW "                \
      "WHEN NEW.frecency >= 0 "                                             \
      "AND ABS("                                                            \
      "IFNULL((NEW.frecency - OLD.frecency) / CAST(NEW.frecency AS REAL), " \
      "(NEW.frecency - OLD.frecency))"                                      \
      ") > .05 "                                                            \
      "BEGIN "                                                              \
      "UPDATE moz_hosts "                                                   \
      "SET frecency = (SELECT MAX(frecency) FROM moz_places "               \
      "WHERE rev_host = get_unreversed_host(host || '.') || '.' "           \
      "OR rev_host = get_unreversed_host(host || '.') || '.www.') "         \
      "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); "         \
      "END")

#define CREATE_PLACES_AFTERUPDATE_TYPED_TRIGGER                     \
  NS_LITERAL_CSTRING(                                               \
      "CREATE TEMP TRIGGER moz_places_afterupdate_typed_trigger "   \
      "AFTER UPDATE OF typed ON moz_places FOR EACH ROW "           \
      "WHEN NEW.typed = 1 "                                         \
      "BEGIN "                                                      \
      "UPDATE moz_hosts "                                           \
      "SET typed = 1 "                                              \
      "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); " \
      "END")

/**
 * This trigger removes a row from moz_openpages_temp when open_count reaches 0.
 *
 * @note this should be kept up-to-date with the definition in
 *       nsPlacesAutoComplete.js
 */
#define CREATE_REMOVEOPENPAGE_CLEANUP_TRIGGER                            \
  NS_LITERAL_CSTRING(                                                    \
      "CREATE TEMPORARY TRIGGER moz_openpages_temp_afterupdate_trigger " \
      "AFTER UPDATE OF open_count ON moz_openpages_temp FOR EACH ROW "   \
      "WHEN NEW.open_count = 0 "                                         \
      "BEGIN "                                                           \
      "DELETE FROM moz_openpages_temp "                                  \
      "WHERE url = NEW.url "                                             \
      "AND userContextId = NEW.userContextId;"                           \
      "END")

#define CREATE_BOOKMARKS_FOREIGNCOUNT_AFTERDELETE_TRIGGER                    \
  NS_LITERAL_CSTRING(                                                        \
      "CREATE TEMP TRIGGER moz_bookmarks_foreign_count_afterdelete_trigger " \
      "AFTER DELETE ON moz_bookmarks FOR EACH ROW "                          \
      "BEGIN "                                                               \
      "UPDATE moz_places "                                                   \
      "SET foreign_count = foreign_count - 1 "                               \
      "WHERE id = OLD.fk;"                                                   \
      "END")

#define CREATE_BOOKMARKS_FOREIGNCOUNT_AFTERINSERT_TRIGGER                    \
  NS_LITERAL_CSTRING(                                                        \
      "CREATE TEMP TRIGGER moz_bookmarks_foreign_count_afterinsert_trigger " \
      "AFTER INSERT ON moz_bookmarks FOR EACH ROW "                          \
      "BEGIN "                                                               \
      "SELECT store_last_inserted_id('moz_bookmarks', NEW.id); "             \
      "UPDATE moz_places "                                                   \
      "SET foreign_count = foreign_count + 1 "                               \
      "WHERE id = NEW.fk;"                                                   \
      "END")

#define CREATE_BOOKMARKS_FOREIGNCOUNT_AFTERUPDATE_TRIGGER                    \
  NS_LITERAL_CSTRING(                                                        \
      "CREATE TEMP TRIGGER moz_bookmarks_foreign_count_afterupdate_trigger " \
      "AFTER UPDATE OF fk ON moz_bookmarks FOR EACH ROW "                    \
      "BEGIN "                                                               \
      "UPDATE moz_places "                                                   \
      "SET foreign_count = foreign_count + 1 "                               \
      "WHERE id = NEW.fk;"                                                   \
      "UPDATE moz_places "                                                   \
      "SET foreign_count = foreign_count - 1 "                               \
      "WHERE id = OLD.fk;"                                                   \
      "END")

#define CREATE_KEYWORDS_FOREIGNCOUNT_AFTERDELETE_TRIGGER                    \
  NS_LITERAL_CSTRING(                                                       \
      "CREATE TEMP TRIGGER moz_keywords_foreign_count_afterdelete_trigger " \
      "AFTER DELETE ON moz_keywords FOR EACH ROW "                          \
      "BEGIN "                                                              \
      "UPDATE moz_places "                                                  \
      "SET foreign_count = foreign_count - 1 "                              \
      "WHERE id = OLD.place_id;"                                            \
      "END")

#define CREATE_KEYWORDS_FOREIGNCOUNT_AFTERINSERT_TRIGGER                   \
  NS_LITERAL_CSTRING(                                                      \
      "CREATE TEMP TRIGGER moz_keyords_foreign_count_afterinsert_trigger " \
      "AFTER INSERT ON moz_keywords FOR EACH ROW "                         \
      "BEGIN "                                                             \
      "UPDATE moz_places "                                                 \
      "SET foreign_count = foreign_count + 1 "                             \
      "WHERE id = NEW.place_id;"                                           \
      "END")

#define CREATE_KEYWORDS_FOREIGNCOUNT_AFTERUPDATE_TRIGGER                    \
  NS_LITERAL_CSTRING(                                                       \
      "CREATE TEMP TRIGGER moz_keywords_foreign_count_afterupdate_trigger " \
      "AFTER UPDATE OF place_id ON moz_keywords FOR EACH ROW "              \
      "BEGIN "                                                              \
      "UPDATE moz_places "                                                  \
      "SET foreign_count = foreign_count + 1 "                              \
      "WHERE id = NEW.place_id; "                                           \
      "UPDATE moz_places "                                                  \
      "SET foreign_count = foreign_count - 1 "                              \
      "WHERE id = OLD.place_id; "                                           \
      "END")

#define CREATE_ICONS_AFTERINSERT_TRIGGER                      \
  NS_LITERAL_CSTRING(                                         \
      "CREATE TEMP TRIGGER moz_icons_afterinsert_v1_trigger " \
      "AFTER INSERT ON moz_icons FOR EACH ROW "               \
      "BEGIN "                                                \
      "SELECT store_last_inserted_id('moz_icons', NEW.id); "  \
      "END")

#endif  // __nsPlacesTriggers_h__