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<?php
/**
 * TMssqlMetaData class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TPgsqlMetaData.php 1866 2007-04-14 05:02:29Z wei $
 * @package System.Data.Common.Pgsql
 */

/**
 * Load the base TDbMetaData class.
 */
Prado::using('System.Data.Common.TDbMetaData');
Prado::using('System.Data.Common.Mssql.TMssqlTableInfo');

/**
 * TMssqlMetaData loads MSSQL database table and column information.
 *
 * @author Wei Zhuo <weizho[at]gmail[dot]com>
 * @version $Id: TPgsqlMetaData.php 1866 2007-04-14 05:02:29Z wei $
 * @package System.Data.Common.Mssql
 * @since 3.1
 */
class TMssqlMetaData extends TDbMetaData
{
        /**
         * @return string TDbTableInfo class name.
         */
        protected function getTableInfoClass()
        {
                return 'TMssqlTableInfo';
        }

        /**
         * Get the column definitions for given table.
         * @param string table name.
         * @return TMssqlTableInfo table information.
         */
        protected function createTableInfo($table)
        {
                list($catalogName,$schemaName,$tableName) = $this->getCatalogSchemaTableName($table);
                $this->getDbConnection()->setActive(true);
                $sql = <<<EOD
                                SELECT t.*,
                         c.*,
                                        columnproperty(object_id(c.table_schema + '.' + c.table_name), c.column_name,'IsIdentity') as IsIdentity
                    FROM INFORMATION_SCHEMA.TABLES t,
                         INFORMATION_SCHEMA.COLUMNS c
                   WHERE t.table_name = c.table_name
                     AND t.table_name = :table
EOD;
                if($schemaName!==null)
                        $sql .= ' AND t.schema_name = :schema';
                if($catalogName!==null)
                        $sql .= ' AND t.catalog_name = :catalog';

                $command = $this->getDbConnection()->createCommand($sql);
                $command->bindValue(':table', $tableName);
                if($schemaName!==null)
                        $command->bindValue(':schema', $schemaName);
                if($catalogName!==null)
                        $command->bindValue(':catalog', $catalogName);

                $tableInfo=null;
                foreach($command->query() as $col)
                {
                        if($tableInfo===null)
                                $tableInfo = $this->createNewTableInfo($col);
                        $this->processColumn($tableInfo,$col);
                }
                if($tableInfo===null)
                        throw new TDbException('dbmetadata_invalid_table_view', $table);
                return $tableInfo;
        }

        /**
         * @param string table name
         * @return array tuple($catalogName,$schemaName,$tableName)
         */
        protected function getCatalogSchemaTableName($table)
        {
                //remove possible delimiters
                $result = explode('.', preg_replace('/\[|\]|"/', '', $table));
                if(count($result)===1)
                        return array(null,null,$result[0]);
                if(count($result)===2)
                        return array(null,$result[0],$result[1]);
                if(count($result)>2)
                        return array($result[0],$result[1],$result[2]);
        }

        /**
         * @param TMssqlTableInfo table information.
         * @param array column information.
         */
        protected function processColumn($tableInfo, $col)
        {
                $columnId = $col['COLUMN_NAME'];

                $info['ColumnName'] = "[$columnId]"; //quote the column names!
                $info['ColumnId'] = $columnId;
                $info['ColumnIndex'] = intval($col['ORDINAL_POSITION'])-1; //zero-based index
                if($col['IS_NULLABLE']!=='NO')
                        $info['AllowNull'] = true;
                if($col['COLUMN_DEFAULT']!==null)
                        $info['DefaultValue'] = $col['COLUMN_DEFAULT'];

                if(in_array($columnId, $tableInfo->getPrimaryKeys()))
                        $info['IsPrimaryKey'] = true;
                if($this->isForeignKeyColumn($columnId, $tableInfo))
                        $info['IsForeignKey'] = true;

                if($col['IsIdentity']==='1')
                        $info['AutoIncrement'] = true;
                $info['DbType'] = $col['DATA_TYPE'];
                if($col['CHARACTER_MAXIMUM_LENGTH']!==null)
                        $info['ColumnSize'] = intval($col['CHARACTER_MAXIMUM_LENGTH']);
                if($col['NUMERIC_PRECISION'] !== null)
                        $info['NumericPrecision'] = intval($col['NUMERIC_PRECISION']);
                if($col['NUMERIC_SCALE']!==null)
                        $info['NumericScale'] = intval($col['NUMERIC_SCALE']);
                $tableInfo->Columns[$columnId] = new TMssqlTableColumn($info);
        }

        /**
         * @param string table schema name
         * @param string table name.
         * @return TMssqlTableInfo
         */
        protected function createNewTableInfo($col)
        {
                $info['CatalogName'] = $col['TABLE_CATALOG'];
                $info['SchemaName'] = $col['TABLE_SCHEMA'];
                $info['TableName'] = $col['TABLE_NAME'];
                if($col['TABLE_TYPE']==='VIEW')
                        $info['IsView'] = true;
                list($primary, $foreign) = $this->getConstraintKeys($col);
                $class = $this->getTableInfoClass();
                return new $class($info,$primary,$foreign);
        }

        /**
         * Gets the primary and foreign key column details for the given table.
         * @param string schema name
         * @param string table name.
         * @return array tuple ($primary, $foreign)
         */
        protected function getConstraintKeys($col)
        {
                $sql = <<<EOD
                SELECT k.column_name field_name
                    FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE k
                    LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
                      ON k.table_name = c.table_name
                     AND k.constraint_name = c.constraint_name
                   WHERE k.constraint_catalog = DB_NAME()
                AND
                        c.constraint_type ='PRIMARY KEY'
                    AND k.table_name = :table
EOD;
                $command = $this->getDbConnection()->createCommand($sql);
                $command->bindValue(':table', $col['TABLE_NAME']);
                $primary = array();
                foreach($command->query()->readAll() as $field)
                        $primary[] = $field['field_name'];
                $foreign = $this->getForeignConstraints($col);
                return array($primary,$foreign);
        }

        /**
         * Gets foreign relationship constraint keys and table name
         * @param string database name
         * @param string table name
         * @return array foreign relationship table name and keys.
         */
        protected function getForeignConstraints($col)
        {
                //From http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
                $sql = <<<EOD
                SELECT
                     KCU1.CONSTRAINT_NAME AS 'FK_CONSTRAINT_NAME'
                   , KCU1.TABLE_NAME AS 'FK_TABLE_NAME'
                   , KCU1.COLUMN_NAME AS 'FK_COLUMN_NAME'
                   , KCU1.ORDINAL_POSITION AS 'FK_ORDINAL_POSITION'
                   , KCU2.CONSTRAINT_NAME AS 'UQ_CONSTRAINT_NAME'
                   , KCU2.TABLE_NAME AS 'UQ_TABLE_NAME'
                   , KCU2.COLUMN_NAME AS 'UQ_COLUMN_NAME'
                   , KCU2.ORDINAL_POSITION AS 'UQ_ORDINAL_POSITION'
                FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
                JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU1
                ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
                   AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
                   AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
                JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU2
                ON KCU2.CONSTRAINT_CATALOG =
                RC.UNIQUE_CONSTRAINT_CATALOG
                   AND KCU2.CONSTRAINT_SCHEMA =
                RC.UNIQUE_CONSTRAINT_SCHEMA
                   AND KCU2.CONSTRAINT_NAME =
                RC.UNIQUE_CONSTRAINT_NAME
                   AND KCU2.ORDINAL_POSITION = KCU1.ORDINAL_POSITION
                WHERE KCU1.TABLE_NAME = :table
EOD;
                $command = $this->getDbConnection()->createCommand($sql);
                $command->bindValue(':table', $col['TABLE_NAME']);
                $fkeys=array();
                $catalogSchema = "[{$col['TABLE_CATALOG']}].[{$col['TABLE_SCHEMA']}]";
                foreach($command->query() as $info)
                {
                        $fkeys[$info['FK_CONSTRAINT_NAME']]['keys'][$info['FK_COLUMN_NAME']] = $info['UQ_COLUMN_NAME'];
                        $fkeys[$info['FK_CONSTRAINT_NAME']]['table'] = $info['UQ_TABLE_NAME'];
                }
                return count($fkeys) > 0 ? array_values($fkeys) : $fkeys;
        }

        /**
         * @param string column name.
         * @param TPgsqlTableInfo table information.
         * @return boolean true if column is a foreign key.
         */
        protected function isForeignKeyColumn($columnId, $tableInfo)
        {
                foreach($tableInfo->getForeignKeys() as $fk)
                {
                        if(in_array($columnId, array_keys($fk['keys'])))
                                return true;
                }
                return false;
        }
}