<?php
/**
 * Piwik - Open source web analytics
 *
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 *
 * @category Piwik
 * @package Piwik
 */

/**
 * Database schema interface
 *
 * @package Piwik
 * @subpackage Piwik_Db
 */
interface Piwik_Db_Schema_Interface
{
	/**
	 * Is this schema available?
	 *
	 * @return bool  True if schema is available; false otherwise
	 */
	static public function isAvailable();

	/**
	 * Get the SQL to create a specific Piwik table
	 *
	 * @param string  $tableName
	 * @return string  SQL
	 */
	public function getTableCreateSql($tableName);

	/**
	 * Get the SQL to create Piwik tables
	 *
	 * @return array  array of strings containing SQL
	 */
	public function getTablesCreateSql();

	/**
	 * Create database
	 *
	 * @param string  $dbName  Name of the database to create
	 */
	public function createDatabase( $dbName = null );

	/**
	 * Drop database
	 */
	public function dropDatabase();

	/**
	 * Create all tables
	 */
	public function createTables();

	/**
	 * Creates an entry in the User table for the "anonymous" user.
	 */
	public function createAnonymousUser();

	/**
	 * Truncate all tables
	 */
	public function truncateAllTables();

	/**
	 * Drop specific tables
	 *
	 * @param array  $doNotDelete  Names of tables to not delete
	 */
	public function dropTables( $doNotDelete = array() );

	/**
	 * Names of all the prefixed tables in piwik
	 * Doesn't use the DB
	 *
	 * @return array  Table names
	 */
	public function getTablesNames();

	/**
	 * Get list of tables installed
	 *
	 * @param bool  $forceReload  Invalidate cache
	 * @return array  installed Tables
	 */
	public function getTablesInstalled($forceReload = true);

	/**
	 * Checks whether any table exists
	 *
	 * @return bool  True if tables exist; false otherwise
	 */
	public function hasTables();
}
