<?php
  /**************************************************************************\
  * phpGroupWare - Setup                                                     *
  * http://www.phpgroupware.org                                              *
  * --------------------------------------------                             *
  *  This program is free software; you can redistribute it and/or modify it *
  *  under the terms of the GNU General Public License as published by the   *
  *  Free Software Foundation; either version 2 of the License, or (at your  *
  *  option) any later version.                                              *
  \**************************************************************************/

  /* $Id$ */

	class schema_proc_mysql
	{
		var $m_sStatementTerminator;
		// Following added to convert sql to array
		var $sCol = array();
		var $pk = array();
		var $fk = array();
		var $ix = array();
		var $uc = array();

		function schema_proc_mysql()
		{
			$this->m_sStatementTerminator = ';';
		}

		// Return a type suitable for DDL
		function TranslateType($sType, $iPrecision = 0, $iScale = 0, &$sTranslated)
		{
			$sTranslated = '';
			switch($sType)
			{
				case 'auto':
					$sTranslated = 'int(11) auto_increment';
					break;
				case 'blob':
					$sTranslated = 'blob';
					break;
				case 'char':
					if ($iPrecision > 0 && $iPrecision < 256)
					{
						$sTranslated =  sprintf("char(%d)", $iPrecision);
					}
					if ($iPrecision > 255)
					{
						$sTranslated =  'text';
					}
					break;
				case 'date':
					$sTranslated =  'date';
					break;
				case 'decimal':
					$sTranslated =  sprintf("decimal(%d,%d)", $iPrecision, $iScale);
					break;
				case 'float':
					switch ($iPrecision)
					{
						case 4:
							$sTranslated = 'float';
							break;
						case 8:
							$sTranslated = 'double';
							break;
					}
					break;
				case 'int':
					switch ($iPrecision)
					{
						case 2:
							$sTranslated = 'smallint';
							break;
						case 4:
							$sTranslated = 'int';
							break;
						case 8:
							$sTranslated = 'bigint';
							break;
					}
					break;
				case 'longtext':
					$sTranslated = 'longtext';
					break;
				case 'text':
					$sTranslated = 'text';
					break;
				case 'timestamp':
					$sTranslated = 'datetime';
					break;
				case 'varchar':
					if ($iPrecision > 0 && $iPrecision < 256)
					{
						$sTranslated =  sprintf("varchar(%d)", $iPrecision);
					}
					if ($iPrecision > 255)
					{
						$sTranslated =  'text';
					}
					break;
			}
			
			return (strlen($sTranslated) > 0);
		}

		function TranslateDefault($sDefault)
		{
			switch ($sDefault)
			{
				case 'current_date':
				case 'current_timestamp':
					return 'now';
			}

			return $sDefault;
		}

		// Inverse of above, convert sql column types to array info
		function rTranslateType($sType, $iPrecision = 0, $iScale = 0, &$sTranslated)
		{
			$sTranslated = '';
			if ($sType == 'int' || $sType == 'tinyint' ||  $sType == 'smallint' || $sType == 'bigint')
			{
				if ($iPrecision > 8)
				{
					$iPrecision = 8;
				}
				elseif($iPrecision > 4)
				{
					$iPrecision = 4;
				}
				else
				{
					$iPrecision = 2;
				}
			}
			switch($sType)
			{
				case 'tinyint':
				case 'smallint':
					$sTranslated = "'type' => 'int', 'precision' => 2";
					break;
				case 'int':
					$sTranslated = "'type' => 'int', 'precision' => 4";
					break;
				case 'bigint':
					$sTranslated = "'type' => 'int', 'precision' => 8";
				case 'char':
					if ($iPrecision > 0 && $iPrecision < 256)
					{
						$sTranslated = "'type' => 'char', 'precision' => $iPrecision";
					}
					if ($iPrecision > 255)
					{
						$sTranslated =  "'type' => 'text'";
					}
					break;
				case 'decimal':
					$sTranslated = "'type' => 'decimal', 'precision' => $iPrecision, 'scale' => $iScale";
					break;
				case 'float':
				case 'double':
					$sTranslated = "'type' => 'float', 'precision' => $iPrecision";
					break;
				case 'datetime':
					$sTranslated = "'type' => 'timestamp'";
					break;
				case 'enum':
					// Here comes a nasty assumption
					$sTranslated =  "'type' => 'varchar', 'precision' => 255";
					break;
				case 'varchar':
					if ($iPrecision > 0 && $iPrecision < 256)
					{
						$sTranslated =  "'type' => 'varchar', 'precision' => $iPrecision";
					}
					if ($iPrecision > 255)
					{
						$sTranslated =  "'type' => 'text'";
					}
					break;
				case 'longtext':
				case 'text':
				case 'blob':
				case 'date':
					$sTranslated = "'type' => '$sType'";
					break;
			}

			return (strlen($sTranslated) > 0);
		}

		function GetPKSQL($sFields)
		{
			return "PRIMARY KEY($sFields)";
		}

		function GetUCSQL($sFields)
		{
			return "UNIQUE($sFields)";
		}

		function _GetColumns($oProc, $sTableName, &$sColumns, $sDropColumn = '')
		{
			$sColumns = '';
			$this->pk = array();
			$this->fk = array();
			$this->ix = array();
			$this->uc = array();
			
			// Field, Type, Null, Key, Default, Extra
			$oProc->m_odb->query("describe $sTableName");
			while ($oProc->m_odb->next_record())
			{
				$type = $default = $null = $nullcomma = $prec = $scale = $ret = $colinfo = $scales = '';
				if ($sColumns != '')
				{
					$sColumns .= ',';
				}
				$sColumns .= $oProc->m_odb->f(0);

				// The rest of this is used only for SQL->array
				$colinfo = explode('(',$oProc->m_odb->f(1));
				$prec = ereg_replace(')','',$colinfo[1]);
				$scales = explode(',',$prec);
				if ($scales[1])
				{
					$prec  = $scales[0];
					$scale = $scales[1];
				}
				$this->rTranslateType($colinfo[0], $prec, $scale, &$type);

				if ($oProc->m_odb->f(2) == 'YES')
				{
					$null = "'nullable' => True";
				}
				else
				{
					$null = "'nullable' => False";
				}
				if ($oProc->m_odb->f(4))
				{
					$default = "'default' => '".$oProc->m_odb->f(4)."'";
					$nullcomma = ',';
				}
				else
				{
					$default = '';
					$nullcomma = '';
				}
				if ($oProc->m_odb->f(5))
				{
					$type = "'type' => 'auto'";
				}
				$this->sCol[] = "\t\t\t\t'" . $oProc->m_odb->f(0)."' => array(" . $type . ',' . $null . $nullcomma . $default . '),' . "\n";
				if ($oProc->m_odb->f(3) == 'PRI')
				{
					$this->pk[] = $oProc->m_odb->f(0);
				}
				if ($oProc->m_odb->f(3) == 'UNI')
				{
					$this->uc[] = $oProc->m_odb->f(0);
				}
				// Hmmm, MUL could also mean unique, or not...
				if ($oProc->m_odb->f(3) == 'MUL')
				{
					$this->ix[] = $oProc->m_odb->f(0);
				}
			}
			// ugly as heck, but is here to chop the trailing comma on the last element (for php3)
			$this->sCol[count($this->sCol) - 1] = substr($this->sCol[count($this->sCol) - 1],0,-2) . "\n";

			return false;
		}

		function DropTable($oProc, &$aTables, $sTableName)
		{
			return !!($oProc->m_odb->query("DROP TABLE " . $sTableName));
		}

		function DropColumn($oProc, &$aTables, $sTableName, $aNewTableDef, $sColumnName, $bCopyData = true)
		{
			return !!($oProc->m_odb->query("ALTER TABLE $sTableName DROP COLUMN $sColumnName"));
		}

		function RenameTable($oProc, &$aTables, $sOldTableName, $sNewTableName)
		{
			return !!($oProc->m_odb->query("ALTER TABLE $sOldTableName RENAME $sNewTableName"));
		}

		function RenameColumn($oProc, &$aTables, $sTableName, $sOldColumnName, $sNewColumnName, $bCopyData = true)
		{
			// This really needs testing - it can affect primary keys, and other table-related objects
			// like sequences and such
			global $DEBUG;
			if ($DEBUG) { echo '<br>RenameColumn: calling _GetFieldSQL for ' . $sNewColumnName; }
			if ($oProc->_GetFieldSQL($aTables[$sTableName]["fd"][$sNewColumnName], $sNewColumnSQL))
			{
				return !!($oProc->m_odb->query("ALTER TABLE $sTableName CHANGE $sOldColumnName $sNewColumnName " . $sNewColumnSQL));
			}
			return false;
		}

		function AlterColumn($oProc, &$aTables, $sTableName, $sColumnName, &$aColumnDef, $bCopyData = true)
		{
			global $DEBUG;
			if ($DEBUG) { echo '<br>AlterColumn: calling _GetFieldSQL for ' . $sNewColumnName; }
			if ($oProc->_GetFieldSQL($aTables[$sTableName]["fd"][$sColumnName], $sNewColumnSQL))
			{
				return !!($oProc->m_odb->query("ALTER TABLE $sTableName MODIFY $sColumnName " . $sNewColumnSQL));
				/* return !!($oProc->m_odb->query("ALTER TABLE $sTableName CHANGE $sColumnName $sColumnName " . $sNewColumnSQL)); */
			}

			return false;
		}

		function AddColumn($oProc, &$aTables, $sTableName, $sColumnName, &$aColumnDef)
		{
			$oProc->_GetFieldSQL($aColumnDef, $sFieldSQL);
			$query = "ALTER TABLE $sTableName ADD COLUMN $sColumnName $sFieldSQL";

			return !!($oProc->m_odb->query($query));
		}

		function GetSequenceSQL($sTableName, &$sSequenceSQL)
		{
			$sSequenceSQL = '';
			return true;
		}

		function CreateTable($oProc, &$aTables, $sTableName, $aTableDef)
		{
			if ($oProc->_GetTableSQL($sTableName, $aTableDef, $sTableSQL, $sSequenceSQL))
			{
				// create sequence first since it will be needed for default
				if ($sSequenceSQL != '')
				{
					$oProc->m_odb->query($sSequenceSQL);
				}

				$query = "CREATE TABLE $sTableName ($sTableSQL)";
				return !!($oProc->m_odb->query($query));
			}

			return false;
		}	
	}
?>