<?php
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5                                                 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | Redistributions in binary form must reproduce the above copyright    |
// | notice, this list of conditions and the following disclaimer in the  |
// | documentation and/or other materials provided with the distribution. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
// | POSSIBILITY OF SUCH DAMAGE.                                          |
// +----------------------------------------------------------------------+
// | Author: Paul Cooper <pgc@ucecom.com>                                 |
// +----------------------------------------------------------------------+

require_once 'MDB2/Driver/Reverse/Common.php';

/**
 * MDB2 PostGreSQL driver for the schema reverse engineering module
 *
 * @package MDB2
 * @category Database
 * @author  Paul Cooper <pgc@ucecom.com>
 */
class MDB2_Driver_Reverse_pgsql extends MDB2_Driver_Reverse_Common
{
    // {{{ getTableFieldDefinition()

    /**
     * Get the stucture of a field into an array
     *
     * @param string    $table         name of table that should be used in method
     * @param string    $field_name     name of field that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableFieldDefinition($table, $field_name)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $result = $db->loadModule('Datatype', null, true);
        if (PEAR::isError($result)) {
            return $result;
        }

        $query = "SELECT
                    a.attname AS name, t.typname AS type, a.attlen AS length, a.attnotnull,
                    a.atttypmod, a.atthasdef,
                    (SELECT substring(pg_get_expr(d.adbin, d.adrelid) for 128)
                        FROM pg_attrdef d
                        WHERE d.adrelid = a.attrelid AND d.adnum = a.attnum AND a.atthasdef) as default
                    FROM pg_attribute a, pg_class c, pg_type t
                    WHERE c.relname = ".$db->quote($table, 'text')."
                        AND a.atttypid = t.oid
                        AND c.oid = a.attrelid
                        AND NOT a.attisdropped
                        AND a.attnum > 0
                        AND a.attname = ".$db->quote($field_name, 'text')."
                    ORDER BY a.attnum";
        $column = $db->queryRow($query, null, MDB2_FETCHMODE_ASSOC);
        if (PEAR::isError($column)) {
            return $column;
        }

        if (empty($column)) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'it was not specified an existing table column', __FUNCTION__);
        }

        $column = array_change_key_case($column, CASE_LOWER);
        list($types, $length, $unsigned, $fixed) = $db->datatype->mapNativeDatatype($column);
        $notnull = false;
        if (!empty($column['attnotnull']) && $column['attnotnull'] == 't') {
            $notnull = true;
        }
        $default = false;
        if ($column['atthasdef'] === 't'
            && !preg_match("/nextval\('([^']+)'/", $column['default'])
        ) {
            $default = $column['default'];#substr($column['adsrc'], 1, -1);
            if (is_null($default) && $notnull) {
                $default = '';
            } elseif ($column['type'] == 'bool') {
                // Convert boolean defaults
                $default = $default == 'true' ? 't' : 'f';
            } elseif (preg_match("/^'(.*)'::([a-z0-9 ]+)$/", $default, $m)) {
                // Make sure that casted expressions are correcty handled
                $default = $m[1];
            } elseif (preg_match("/^NULL::([a-z0-9 ]+)$/", $default, $m)) {
                // Make sure that casted NULLs are correcty handled
                $default = null;
            }
        }
        $autoincrement = false;
        if (preg_match("/nextval\('([^']+)'/", $column['default'], $nextvals)) {
            $autoincrement = true;
        }
        $definition[0] = array('notnull' => $notnull, 'nativetype' => $column['type']);
        if (!is_null($length)) {
            $definition[0]['length'] = $length;
        }
        if (!is_null($unsigned)) {
            $definition[0]['unsigned'] = $unsigned;
        }
        if (!is_null($fixed)) {
            $definition[0]['fixed'] = $fixed;
        }
        if ($default !== false) {
            $definition[0]['default'] = $default;
        }
        if ($autoincrement !== false) {
            $definition[0]['autoincrement'] = $autoincrement;
        }
        foreach ($types as $key => $type) {
            $definition[$key] = $definition[0];
            if ($type == 'clob' || $type == 'blob') {
                unset($definition[$key]['default']);
            } elseif ($type == 'decimal') {
                $definition[$key]['length'] = ($definition[$key]['length'] >> 16).','.
                    ($definition[$key]['length'] & 0xFF);
            }
            $definition[$key]['type'] = $type;
            $definition[$key]['mdb2type'] = $type;
        }
        return $definition;
    }

    // }}}
    // {{{ getTableIndexDefinition()
    /**
     * Get the stucture of an index into an array
     *
     * @param string    $table      name of table that should be used in method
     * @param string    $index_name name of index that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableIndexDefinition($table, $index_name)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $index_name = $db->getIndexName($index_name);
        $query = 'SELECT relname, indkey FROM pg_index, pg_class';
        $query.= ' WHERE pg_class.oid = pg_index.indexrelid';
        $query.= " AND indisunique != 't' AND indisprimary != 't'";
        $query.= ' AND pg_class.relname = '.$db->quote($index_name, 'text');
        $row = $db->queryRow($query, null, MDB2_FETCHMODE_ASSOC);
        if (PEAR::isError($row)) {
            return $row;
        }

        if (empty($row)) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'it was not specified an existing table index', __FUNCTION__);
        }

        $row = array_change_key_case($row, CASE_LOWER);

        $query = 'SELECT attnum, attname FROM pg_attribute, pg_class';
        $query.= ' WHERE pg_class.oid = pg_attribute.attrelid';
        $query.= ' AND pg_class.relname = '.$db->quote($table, 'text');
        $columns = $db->GetAssoc($query);
        if (PEAR::isError($columns)) {
            return $columns;
        }

        $definition = array();

        $index_column_numbers = explode(' ', $row['indkey']);

        foreach ($index_column_numbers as $number) {
            $definition['fields'][$columns[$number]] = array('sorting' => 'ascending');
        }
        return $definition;
    }

    // }}}
    // {{{ getTableConstraintDefinition()
    /**
     * Get the stucture of a constraint into an array
     *
     * @param string    $table      name of table that should be used in method
     * @param string    $index_name name of index that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableConstraintDefinition($table, $index_name)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $index_name = $db->getIndexName($index_name);
        $query = 'SELECT relname, indisunique, indisprimary, indkey FROM pg_index, pg_class';
        $query.= ' WHERE pg_class.oid = pg_index.indexrelid';
        $query.= " AND (indisunique = 't' OR indisprimary = 't')";
        $query.= ' AND pg_class.relname = '.$db->quote($index_name, 'text');
        $row = $db->queryRow($query, null, MDB2_FETCHMODE_ASSOC);
        if (PEAR::isError($row)) {
            return $row;
        }

        if (empty($row)) {
            return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
                'it was not specified an existing table constraint', __FUNCTION__);
        }

        $row = array_change_key_case($row, CASE_LOWER);

        $query = 'SELECT attnum, attname FROM pg_attribute, pg_class';
        $query.= ' WHERE pg_class.oid = pg_attribute.attrelid';
        $query.= ' AND pg_class.relname = '.$db->quote($table, 'text');
        $columns = $db->GetAssoc($query);
        if (PEAR::isError($columns)) {
            return $columns;
        }

        $definition = array();
        if ($row['indisprimary'] == 't') {
            $definition['primary'] = true;
        } elseif ($row['indisunique'] == 't') {
            $definition['unique'] = true;
        }

        $index_column_numbers = explode(' ', $row['indkey']);

        foreach ($index_column_numbers as $number) {
            $definition['fields'][$columns[$number]] = array('sorting' => 'ascending');
        }
        return $definition;
    }

    // }}}
    // {{{ tableInfo()

    /**
     * Returns information about a table or a result set
     *
     * NOTE: only supports 'table' and 'flags' if <var>$result</var>
     * is a table name.
     *
     * @param object|string  $result  MDB2_result object from a query or a
     *                                 string containing the name of a table.
     *                                 While this also accepts a query result
     *                                 resource identifier, this behavior is
     *                                 deprecated.
     * @param int            $mode    a valid tableInfo mode
     *
     * @return array  an associative array with the information requested.
     *                 A MDB2_Error object on failure.
     *
     * @see MDB2_Driver_Common::tableInfo()
     */
    function tableInfo($result, $mode = null)
    {
        if (is_string($result)) {
           return parent::tableInfo($result, $mode);
        }

        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

        $resource = MDB2::isResultCommon($result) ? $result->getResource() : $result;
        if (!is_resource($resource)) {
            return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
                'Could not generate result resource', __FUNCTION__);
        }

        if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
            if ($db->options['field_case'] == CASE_LOWER) {
                $case_func = 'strtolower';
            } else {
                $case_func = 'strtoupper';
            }
        } else {
            $case_func = 'strval';
        }

        $count = @pg_num_fields($resource);
        $res   = array();

        if ($mode) {
            $res['num_fields'] = $count;
        }

        $db->loadModule('Datatype', null, true);
        for ($i = 0; $i < $count; $i++) {
            $res[$i] = array(
                'table' => function_exists('pg_field_table') ? @pg_field_table($resource, $i) : '',
                'name'  => $case_func(@pg_field_name($resource, $i)),
                'type'  => @pg_field_type($resource, $i),
                'length' => @pg_field_size($resource, $i),
                'flags' => '',
            );
            $mdb2type_info = $db->datatype->mapNativeDatatype($res[$i]);
            if (PEAR::isError($mdb2type_info)) {
               return $mdb2type_info;
            }
            $res[$i]['mdb2type'] = $mdb2type_info[0][0];
            if ($mode & MDB2_TABLEINFO_ORDER) {
                $res['order'][$res[$i]['name']] = $i;
            }
            if ($mode & MDB2_TABLEINFO_ORDERTABLE) {
                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
            }
        }

        return $res;
    }
}
?>
