<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 *
 * @package phpMyAdmin
 */

/**
 * This Class interacts with the user to gather the information
 * about their tables for which they want to export the relational schema
 * export options are shown to user from they can choose
 *
 * @name User_Schema
 * @copyright
 * @license
 */

class PMA_User_Schema
{

    public $chosenPage;
    public $autoLayoutForeign;
    public $autoLayoutInternal;
    public $pageNumber;
    public $c_table_rows;
    public $action;

    public function setAction($value)
    {
        $this->action = $value;
    }
    /**
     * This function will process the user defined pages
     * and tables which will be exported as Relational schema
     * you can set the table positions on the paper via scratchboard
     * for table positions, put the x,y co-ordinates
     *
     * @param string $this->action It tells what the Schema is supposed to do
     *                       create and select a page, generate schema etc
     * @access public
     */

    public function processUserChoice()
    {
        global $action_choose,$db,$cfgRelation,$cfg,$query_default_option;

        if (isset($this->action)) {
            switch ($this->action) {
            case 'selectpage':
                $this->chosenPage = $_REQUEST['chpage'];
                if ($action_choose=="1") {
                    $this->deleteCoordinates($db, $cfgRelation, $this->chosenPage, $query_default_option);
                    $this->deletePages($db, $cfgRelation, $this->chosenPage, $query_default_option);
                    $this->chosenPage = 0;
                }
                break;
            case 'createpage':
                $this->pageNumber = PMA_REL_create_page($_POST['newpage'], $cfgRelation, $db, $query_default_option);
                $this->autoLayoutForeign = isset($_POST['auto_layout_foreign']) ? "1":NULL;
                $this->autoLayoutInternal = isset($_POST['auto_layout_internal']) ? "1":NULL;
                $this->processRelations($db, $this->pageNumber,$cfgRelation,$query_default_option);
                break;
            case 'edcoord':
                $this->chosenPage = $_POST['chpage'];
                $this->c_table_rows = $_POST['c_table_rows'];
                $this->_editCoordinates($db, $cfgRelation,$query_default_option);
                break;
            case 'delete_old_references':
                $this->_deleteTableRows($_POST['delrow'], $cfgRelation, $db, $_POST['chpage']);
                break;
            case 'process_export':
                $this->_processExportSchema();
                break;

            } // end switch
        } // end if (isset($do))

    }

    /**
     * shows/displays the HTML FORM to create the page
     *
     * @param string db name of the selected database
     * @return void
     * @access public
     */
    public function showCreatePageDialog($db)
    {
        ?>
        <form method="post" action="schema_edit.php" name="frm_create_page">
        <fieldset>
        <legend>
        <?php echo __('Create a page') . "\n"; ?>
        </legend>
        <?php echo PMA_generate_common_hidden_inputs($db); ?>
        <input type="hidden" name="do" value="createpage" />
        <table>
        <tr>
        <td><label for="id_newpage"><?php echo __('Page name'); ?></label></td>
        <td><input type="text" name="newpage" id="id_newpage" size="20" maxlength="50" /></td>
        </tr>
        <tr>
        <td><?php echo __('Automatic layout based on'); ?></td>
        <td>
        <input type="checkbox" name="auto_layout_internal" id="id_auto_layout_internal" /><label for="id_auto_layout_internal">
        <?php echo __('Internal relations'); ?></label><br />
        <?php
        /*
         * Check to see whether INNODB and PBXT storage engines are Available in MYSQL PACKAGE
         * If available, then provide AutoLayout for Foreign Keys in Schema View
         */

        if (PMA_StorageEngine::isValid('InnoDB') || PMA_StorageEngine::isValid('PBXT')) {
            ?>
            <input type="checkbox" name="auto_layout_foreign" id="id_auto_layout_foreign" /><label for="id_auto_layout_foreign">
            <?php echo __('FOREIGN KEY'); ?></label><br />
            <?php
        }
        ?>
        </td></tr>
        </table>
        </fieldset>
        <fieldset class="tblFooters">
        <input type="submit" value="<?php echo __('Go'); ?>" />
        </fieldset>
        </form>
        <?php
    }

    /**
     * shows/displays the created page names in a drop down list
     * User can select any page number and edit it using dashboard etc
     *
     * @return void
     * @access public
     */
    public function selectPage()
    {
        global $db,$table,$query_default_option,$cfgRelation;
        $page_query = 'SELECT * FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['pdf_pages'])
                . ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\'';
        $page_rs    = PMA_query_as_controluser($page_query, FALSE, $query_default_option);
        if ($page_rs && PMA_DBI_num_rows($page_rs) > 0) {
            ?>
            <form method="get" action="schema_edit.php" name="frm_select_page">
            <fieldset>
            <legend>
            <?php echo __('Please choose a page to edit') . "\n"; ?>
            </legend>
            <?php echo PMA_generate_common_hidden_inputs($db, $table); ?>
            <input type="hidden" name="do" value="selectpage" />
            <select name="chpage" id="chpage" onchange="this.form.submit()">
            <option value="0"><?php echo __('Select page'); ?></option>
            <?php
            while ($curr_page = PMA_DBI_fetch_assoc($page_rs)) {
                   echo "\n" . '        '
                        . '<option value="' . $curr_page['page_nr'] . '"';
                    if (isset($this->chosenPage) && $this->chosenPage == $curr_page['page_nr']) {
                        echo ' selected="selected"';
                    }
                    echo '>' . $curr_page['page_nr'] . ': ' . htmlspecialchars($curr_page['page_descr']) . '</option>';
            } // end while
            echo "\n";
            ?>
            </select>
            <?php
            $choices = array(
                 '0' => __('Edit'),
                 '1' => __('Delete')
            );
            PMA_display_html_radio('action_choose', $choices, '0', false);
            unset($choices);
            ?>
            </fieldset>
            <fieldset class="tblFooters">
            <input type="submit" value="<?php echo __('Go'); ?>" /><br />
            </fieldset>
            </form>
            <?php
        } // end IF
        echo "\n";
    } // end function

    /**
     * A dashboard is displayed to AutoLayout the position of tables
     * users can drag n drop the tables and change their positions
     *
     * @return void
     * @access public
     */
    public function showTableDashBoard()
    {
        global $db,$cfgRelation,$table,$cfg,$with_field_names,$query_default_option;
        /*
         * We will need an array of all tables in this db
         */
        $selectboxall = array('--');
        $alltab_rs    = PMA_DBI_query('SHOW TABLES FROM ' . PMA_backquote($db) . ';', null, PMA_DBI_QUERY_STORE);
        while ($val = @PMA_DBI_fetch_row($alltab_rs)) {
               $selectboxall[] = $val[0];
        }

        $tabExist = array();

        /*
         * Now if we already have chosen a page number then we should
         * show the tables involved
         */
        if (isset($this->chosenPage) && $this->chosenPage > 0) {
            echo "\n";
            ?>
            <h2><?php echo __('Select Tables') ;?></h2>
            <?php
            $page_query = 'SELECT * FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords'])
                        . ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\''
                        . ' AND pdf_page_number = \'' . PMA_sqlAddslashes($this->chosenPage) . '\'';
            $page_rs    = PMA_query_as_controluser($page_query, FALSE, $query_default_option);
            $array_sh_page = array();
            while ($temp_sh_page = @PMA_DBI_fetch_assoc($page_rs)) {
                   $array_sh_page[] = $temp_sh_page;
            }
            /*
             * Display WYSIWYG parts
             */

            if (!isset($_POST['with_field_names']) && !isset($_POST['showwysiwyg'])) {
                $with_field_names = TRUE;
            }
            $this->_displayScratchboardTables($array_sh_page);
            ?>

            <form method="post" action="schema_edit.php" name="edcoord">
            <?php echo PMA_generate_common_hidden_inputs($db, $table); ?>
            <input type="hidden" name="chpage" value="<?php echo htmlspecialchars($this->chosenPage); ?>" />
            <input type="hidden" name="do" value="edcoord" />
            <table border="0">
            <tr>
                <th><?php echo __('Table'); ?></th>
                <th><?php echo __('Delete'); ?></th>
                <th>X</th>
                <th>Y</th>
            </tr>
            <?php
            if (isset($ctable)) {
                unset($ctable);
            }

            $i = 0;
            $odd_row = true;
            foreach ($array_sh_page as $dummy_sh_page => $sh_page) {
                    $_mtab            =  $sh_page['table_name'];
                    $tabExist[$_mtab] =  FALSE;
                    echo "\n" . '    <tr class="noclick ';
                    if ($odd_row) {
                        echo 'odd';
                    } else {
                        echo 'even';
                    }
                    echo '">';
                    $odd_row != $odd_row;
                    echo "\n" . '        <td>'
                         . "\n" . '            <select name="c_table_' . $i . '[name]">';
                    foreach ($selectboxall as $key => $value) {
                            echo "\n" . '                <option value="' . htmlspecialchars($value) . '"';
                            if ($value == $sh_page['table_name']) {
                                echo ' selected="selected"';
                                $tabExist[$_mtab] = TRUE;
                            }
                            echo '>' . htmlspecialchars($value) . '</option>';
                    }
                    echo "\n" . '            </select>'
                         . "\n" . '        </td>';
                    echo "\n" . '        <td>'
                         . "\n" . '            <input type="checkbox" id="id_c_table_' . $i .'" name="c_table_' . $i . '[delete]" value="y" /><label for="id_c_table_' . $i .'">' . __('Delete') . '</label>';
                    echo "\n" . '        </td>';
                    echo "\n" . '        <td>'
                         . "\n" . '            <input type="text" onchange="dragPlace(' . $i . ', \'x\', this.value)" name="c_table_' . $i . '[x]" value="' . $sh_page['x'] . '" />';
                    echo "\n" . '        </td>';
                    echo "\n" . '        <td>'
                         . "\n" . '            <input type="text" onchange="dragPlace(' . $i . ', \'y\', this.value)" name="c_table_' . $i . '[y]" value="' . $sh_page['y'] . '" />';
                    echo "\n" . '        </td>';
                    echo "\n" . '    </tr>';
                    $i++;
                }
                /*
                 * Add one more empty row
                 */
                echo "\n" . '    <tr class="noclick ';
                if ($odd_row) {
                    echo 'odd';
                } else {
                    echo 'even';
                }
                $odd_row != $odd_row;
                echo '">';
                echo "\n" . '        <td>'
                     . "\n" . '            <select name="c_table_' . $i . '[name]">';
                foreach ($selectboxall as $key => $value) {
                    echo "\n" . '                <option value="' . htmlspecialchars($value) . '">' . htmlspecialchars($value) . '</option>';
                }
                echo "\n" . '            </select>'
                     . "\n" . '        </td>';
                echo "\n" . '        <td>'
                     . "\n" . '            <input type="checkbox" id="id_c_table_' . $i .'" name="c_table_' . $i . '[delete]" value="y" /><label for="id_c_table_' . $i .'">' . __('Delete') . '</label>';
                echo "\n" . '        </td>';
                echo "\n" . '        <td>'
                     . "\n" . '            <input type="text" name="c_table_' . $i . '[x]" value="' . (isset($sh_page['x'])?$sh_page['x']:'') . '" />';
                echo "\n" . '        </td>';
                echo "\n" . '        <td>'
                     . "\n" . '            <input type="text" name="c_table_' . $i . '[y]" value="' . (isset($sh_page['y'])?$sh_page['y']:'') . '" />';
                echo "\n" . '        </td>';
                echo "\n" . '    </tr>';
                echo "\n" . '    </table>' . "\n";

                echo "\n" . '    <input type="hidden" name="c_table_rows" value="' . ($i + 1) . '" />';
                echo "\n" . '    <input type="hidden" id="showwysiwyg" name="showwysiwyg" value="' . ((isset($showwysiwyg) && $showwysiwyg == '1') ? '1' : '0') . '" />';
                echo "\n" . '    <input type="checkbox" name="with_field_names" ' . (isset($with_field_names) ? 'checked="checked"' : ''). ' />' . __('Column names') . '<br />';
                echo "\n" . '    <input type="submit" value="' . __('Save') . '" />';
                echo "\n" . '</form>' . "\n\n";
        } // end if

        $this->_deleteTables($db, $this->chosenPage, $tabExist);
    }

    /**
     * show Export relational schema generation options
     * user can select export type of his own choice
     * and the attributes related to it
     *
     * @return void
     * @access public
     */

    public function displaySchemaGenerationOptions()
    {
        global $cfg,$pmaThemeImage,$db,$test_rs,$chpage;
        ?>
        <form method="post" action="schema_export.php">
            <fieldset>
            <legend>
            <?php
            echo PMA_generate_common_hidden_inputs($db);
            if ($cfg['PropertiesIconic']) {
                echo '<img class="icon" src="' . $pmaThemeImage . 'b_view.png"'
                .' alt="" width="16" height="16" />';
            }
            echo __('Display relational schema');
            ?>:
            </legend>
            <select name="export_type" id="export_type">
                <option value="pdf" selected="selected">PDF</option>
                <option value="svg">SVG</option>
                <option value="dia">DIA</option>
                <option value="visio">Visio</option>
                <option value="eps">EPS</option>
            </select>
            <label><?php echo __('Select Export Relational Type');?></label><br />
            <?php
            if (isset($test_rs)) {
            ?>
            <label for="pdf_page_number_opt"><?php echo __('Page number:'); ?></label>
            <select name="pdf_page_number" id="pdf_page_number_opt">
                   <?php
                   while ($pages = @PMA_DBI_fetch_assoc($test_rs)) {
                          echo '                <option value="' . $pages['page_nr'] . '">'
                                . $pages['page_nr'] . ': ' . htmlspecialchars($pages['page_descr']) . '</option>' . "\n";
                    } // end while
                    PMA_DBI_free_result($test_rs);
                    unset($test_rs);
                    ?>
            </select><br />
            <?php } else { ?>
            <input type="hidden" name="pdf_page_number" value="<?php echo htmlspecialchars($this->chosenPage); ?>" />
            <?php } ?>
            <input type="hidden" name="do" value="process_export" />
            <input type="hidden" name="chpage" value="<?php echo $chpage; ?>" />
            <input type="checkbox" name="show_grid" id="show_grid_opt" />
            <label for="show_grid_opt"><?php echo __('Show grid'); ?></label><br />
            <input type="checkbox" name="show_color" id="show_color_opt" checked="checked" />
            <label for="show_color_opt"><?php echo __('Show color'); ?></label><br />
            <input type="checkbox" name="show_table_dimension" id="show_table_dim_opt" />
            <label for="show_table_dim_opt"><?php echo __('Show dimension of tables'); ?>
            </label><br />
            <input type="checkbox" name="all_table_same_wide" id="all_table_same_wide" />
            <label for="all_table_same_wide"><?php echo __('Display all tables with the same width'); ?>
            </label><br />
            <input type="checkbox" name="with_doc" id="with_doc" checked="checked" />
            <label for="with_doc"><?php echo __('Data Dictionary'); ?></label><br />
            <input type="checkbox" name="show_keys" id="show_keys" />
            <label for="show_keys"><?php echo __('Only show keys'); ?></label><br />
            <select name="orientation" id="orientation_opt" onchange="refreshDragOption('pdflayout');" >
                <option value="L"><?php echo __('Landscape');?></option>
                <option value="P"><?php echo __('Portrait');?></option>
            </select>
            <label for="orientation_opt"><?php echo __('Orientation'); ?></label>
            <br />
            <select name="paper" id="paper_opt" onchange="refreshDragOption('pdflayout');">
                <?php
                foreach ($cfg['PDFPageSizes'] as $key => $val) {
                        echo '<option value="' . $val . '"';
                        if ($val == $cfg['PDFDefaultPageSize']) {
                            echo ' selected="selected"';
                        }
                        echo ' >' . $val . '</option>' . "\n";
                }
                ?>
            </select>
            <label for="paper_opt"><?php echo __('Paper size'); ?></label>
            </fieldset>
            <fieldset class="tblFooters">
            <input type="submit" value="<?php echo __('Go'); ?>" />
            </fieldset>
        </form>
        <?php
    }

    /**
    * Check if there are tables that need to be deleted in dashboard,
    * if there are, ask the user for allowance
    *
    * @param string db name of database selected
    * @param integer chpage selected page
    * @param array tabExist
    * @return void
    * @access private
    */
    private function _deleteTables($db, $chpage, $tabExist)
    {
        $_strtrans  = '';
        $_strname   = '';
        $shoot      = FALSE;
        if (!empty($tabExist) && is_array($tabExist)) {
            foreach ($tabExist as $key => $value) {
                    if (!$value) {
                        $_strtrans  .= '<input type="hidden" name="delrow[]" value="' . htmlspecialchars($key) . '" />' . "\n";
                        $_strname   .= '<li>' . htmlspecialchars($key) . '</li>' . "\n";
                        $shoot       = TRUE;
                    }
            }
            if ($shoot) {
                echo '<form action="schema_edit.php" method="post">' . "\n"
                    . PMA_generate_common_hidden_inputs($db)
                    . '<input type="hidden" name="do" value="delete_old_references" />' . "\n"
                    . '<input type="hidden" name="chpage" value="' . htmlspecialchars($chpage) . '" />' . "\n"
                    . __('The current page has references to tables that no longer exist. Would you like to delete those references?')
                    . '<ul>' . "\n"
                    . $_strname
                    . '</ul>' . "\n"
                    . $_strtrans
                    . '<input type="submit" value="' . __('Go') . '" />' . "\n"
                    . '</form>';
            }
        }

    }

    /**
     * Check if there are tables that need to be deleted in dashboard,
     * if there are, ask the user for allowance
     *
     * @return void
     * @access private
     */
    private function _displayScratchboardTables($array_sh_page)
    {
        global $with_field_names,$cfg,$db;
        ?>
        <script type="text/javascript" src="./js/dom-drag.js"></script>
        <form method="post" action="schema_edit.php" name="dragdrop">
        <input type="button" name="dragdrop" value="<?php echo __('Toggle scratchboard'); ?>" onclick="ToggleDragDrop('pdflayout');" />
        <input type="button" name="dragdropreset" value="<?php echo __('Reset'); ?>" onclick="resetDrag();" />
        </form>
        <div id="pdflayout" class="pdflayout" style="visibility: hidden;">
        <?php
        $draginit = '';
        $draginit2 = '';
        $reset_draginit = '';
        $i = 0;
        foreach ($array_sh_page as $key => $temp_sh_page) {
                $drag_x = $temp_sh_page['x'];
                $drag_y = $temp_sh_page['y'];

                $draginit2      .= ' Drag.init(getElement("table_' . $i . '"), null, 0, parseInt(myid.style.width)-2, 0, parseInt(myid.style.height)-5);' . "\n";
                $draginit2       .= '    getElement("table_' . $i . '").onDrag = function (x, y) { document.edcoord.elements["c_table_' . $i . '[x]"].value = parseInt(x); document.edcoord.elements["c_table_' . $i . '[y]"].value = parseInt(y) }' . "\n";
                $draginit       .= '    getElement("table_' . $i . '").style.left = "' . $drag_x . 'px";' . "\n";
                $draginit       .= '    getElement("table_' . $i . '").style.top  = "' . $drag_y . 'px";' . "\n";
                $reset_draginit .= '    getElement("table_' . $i . '").style.left = "2px";' . "\n";
                $reset_draginit .= '    getElement("table_' . $i . '").style.top  = "' . (15 * $i) . 'px";' . "\n";
                $reset_draginit .= '    document.edcoord.elements["c_table_' . $i . '[x]"].value = "2"' . "\n";
                $reset_draginit .= '    document.edcoord.elements["c_table_' . $i . '[y]"].value = "' . (15 * $i) . '"' . "\n";

                $local_query = 'SHOW FIELDS FROM '
                             .  PMA_backquote($temp_sh_page['table_name'])
                             . ' FROM ' . PMA_backquote($db);
                $fields_rs = PMA_DBI_try_query($local_query);
                unset($local_query);
                // the table has been dropped from outside phpMyAdmin
                if (PMA_DBI_getError()) {
                    continue;
                }
                echo '<div id="table_' . $i . '" class="pdflayout_table"><u>' . $temp_sh_page['table_name'] . '</u>';
                if (isset($with_field_names)) {
                    while ($row = PMA_DBI_fetch_assoc($fields_rs)) {
                           echo '<br />' . htmlspecialchars($row['Field']) . "\n";
                    }
                }
                echo '</div>' . "\n";
                PMA_DBI_free_result($fields_rs);
                unset($fields_rs);
                $i++;
        }
        ?>
        </div>
        <script type="text/javascript">
        //<![CDATA[
        function PDFinit() {
            refreshLayout();
            myid = getElement('pdflayout');
            <?php echo $draginit; ?>
            TableDragInit();
        }

        function TableDragInit() {
            myid = getElement('pdflayout');
            <?php echo $draginit2; ?>
        }

        function resetDrag() {
            <?php echo $reset_draginit; ?>
        }
        //]]>
        </script>
        <?php
    }

    /**
     * delete the table rows with table co-ordinates
     *
     * @param int delrow delete selected table from list of tables
     * @param array cfgRelation relation settings
     * @param string db database name
     * @param integer chpage selected page for adding relations etc
     * @return void
     * @access private
     */
    private function _deleteTableRows($delrow,$cfgRelation,$db,$chpage)
    {
        foreach ($delrow as $current_row) {
                $del_query = 'DELETE FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords']) . ' ' . "\n"
                         .   ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\'' . "\n"
                         .   ' AND   table_name = \'' . PMA_sqlAddslashes($current_row) . '\'' . "\n"
                         .   ' AND   pdf_page_number = \'' . PMA_sqlAddslashes($chpage) . '\'';
                         echo $del_query;
                PMA_query_as_controluser($del_query, FALSE, $query_default_option);
        }
    }

    /**
     * get all the export options and verify
     * call and include the appropriate Schema Class depending on $export_type
     *
     * @return void
     * @access private
     */
    private function _processExportSchema()
    {
        /**
        * Settings for relation stuff
        */
        require_once './libraries/transformations.lib.php';
        require_once './libraries/Index.class.php';
        /**
         * default is PDF, otherwise validate it's only letters a-z
         */
        global  $db,$export_type;
        if (!isset($export_type) || !preg_match('/^[a-zA-Z]+$/', $export_type)) {
            $export_type = 'pdf';
        }

        PMA_DBI_select_db($db);

        include("./libraries/schema/".ucfirst($export_type)."_Relation_Schema.class.php");
        $obj_schema = eval("new PMA_".ucfirst($export_type)."_Relation_Schema();");
    }

    /**
     * delete X and Y coordinates
     *
     * @param string db The database name
     * @param array cfgRelation relation settings
     * @param integer choosePage selected page for adding relations etc
     * @return void
     * @access private
     */
    public function deleteCoordinates($db, $cfgRelation, $choosePage, $query_default_option)
    {
        $query = 'DELETE FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords'])
                                .   ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\''
                                .   ' AND   pdf_page_number = \'' . PMA_sqlAddslashes($choosePage) . '\'';
        PMA_query_as_controluser($query, FALSE, $query_default_option);
    }

    /**
     * delete pages
     *
     * @param string db The database name
     * @param array cfgRelation relation settings
     * @param integer choosePage selected page for adding relations etc
     * @return void
     * @access private
     */
    public function deletePages($db, $cfgRelation, $choosePage, $query_default_option)
    {
        $query = 'DELETE FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['pdf_pages'])
                                .   ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\''
                                .   ' AND   page_nr = \'' . PMA_sqlAddslashes($choosePage) . '\'';
        PMA_query_as_controluser($query, FALSE, $query_default_option);
    }

    /**
     * process internal and foreign key relations
     *
     * @param string db The database name
     * @param array cfgRelation relation settings
     * @param integer pageNumber document number/Id
     * @return void
     * @access private
     */
    public function processRelations($db, $pageNumber, $cfgRelation, $query_default_option)
    {
        /*
         * A u t o m a t i c    l a y o u t
         *
         * There are 2 kinds of relations in PMA
         * 1) Internal Relations 2) Foreign Key Relations
         */
        if (isset($this->autoLayoutInternal) || isset($this->autoLayoutForeign)) {
            $all_tables = array();
        }

        if (isset($this->autoLayoutForeign)) {
            /*
             * get the tables list
             * who support FOREIGN KEY, it's not
             * important that we group together InnoDB tables
             * and PBXT tables, as this logic is just to put
             * the tables on the layout, not to determine relations
             */
            $tables = PMA_DBI_get_tables_full($db);
            $foreignkey_tables = array();
            foreach($tables as $table_name => $table_properties) {
                   if (PMA_foreignkey_supported($table_properties['ENGINE'])) {
                        $foreignkey_tables[] = $table_name;
                    }
            }
            $all_tables = $foreignkey_tables;
            /*
             * could be improved by finding the tables which have the
             * most references keys and placing them at the beginning
             * of the array (so that they are all center of schema)
             */
            unset($tables, $foreignkey_tables);
        }

        if (isset($this->autoLayoutInternal)) {
            /*
             * get the tables list who support Internal Relations;
             * This type of relations will be created when
             * you setup the PMA tables correctly
             */
            $master_tables = 'SELECT COUNT(master_table), master_table'
                           . ' FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['relation'])
                           . ' WHERE master_db = \'' . $db . '\''
                           . ' GROUP BY master_table'
                           . ' ORDER BY ' . PMA_backquote('COUNT(master_table)') . ' DESC ';
            $master_tables_rs = PMA_query_as_controluser($master_tables, FALSE, $query_default_option);
            if ($master_tables_rs && PMA_DBI_num_rows($master_tables_rs) > 0) {
                /* first put all the master tables at beginning
                 * of the list, so they are near the center of
                 * the schema
                 */
                while (list(, $master_table) = PMA_DBI_fetch_row($master_tables_rs)) {
                       $all_tables[] = $master_table;
                }

                /* Now for each master, add its foreigns into an array
                 * of foreign tables, if not already there
                 * (a foreign might be foreign for more than
                 * one table, and might be a master itself)
                 */

                $foreign_tables = array();
                foreach ($all_tables as $master_table) {
                        $foreigners = PMA_getForeigners($db, $master_table);
                        foreach ($foreigners as $foreigner) {
                                if (!in_array($foreigner['foreign_table'], $foreign_tables)) {
                                        $foreign_tables[] = $foreigner['foreign_table'];
                                }
                        }
                }

                /*
                 * Now merge the master and foreign arrays/tables
                 */
                foreach ($foreign_tables as $foreign_table) {
                        if (!in_array($foreign_table, $all_tables)) {
                            $all_tables[] = $foreign_table;
                        }
                }
            }
        }

        if (isset($this->autoLayoutInternal) || isset($this->autoLayoutForeign)) {
            $this->addRelationCoordinates($all_tables,$pageNumber,$db, $cfgRelation,$query_default_option);
        }

        $this->chosenPage = $pageNumber;
    }

    /**
     * Add X and Y coordinates for a table
     *
     * @param string db The database name
     * @param array cfgRelation relation settings
     * @param integer pageNumber document number/Id
     * @param array all_tables A list of all tables involved
     * @return void
     * @access private
     */
    public function addRelationCoordinates($all_tables,$pageNumber,$db, $cfgRelation,$query_default_option)
    {
        /*
         * Now generate the coordinates for the schema
         * in a clockwise spiral and add to co-ordinates table
         */
        $pos_x = 300;
        $pos_y = 300;
        $delta = 110;
        $delta_mult = 1.10;
        $direction = "right";
        foreach ($all_tables as $current_table) {
            /*
            * save current table's coordinates
            */
            $insert_query = 'INSERT INTO ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords']) . ' '
                          . '(db_name, table_name, pdf_page_number, x, y) '
                          . 'VALUES (\'' . PMA_sqlAddslashes($db) . '\', \'' . PMA_sqlAddslashes($current_table) . '\',' . $pageNumber . ',' . $pos_x . ',' . $pos_y . ')';
            PMA_query_as_controluser($insert_query, FALSE, $query_default_option);

            /*
             * compute for the next table
             */
            switch ($direction) {
            case 'right':
                $pos_x    += $delta;
                $direction = "down";
                $delta    *= $delta_mult;
                break;
            case 'down':
                $pos_y    += $delta;
                $direction = "left";
                $delta    *= $delta_mult;
                break;
            case 'left':
                $pos_x    -= $delta;
                $direction = "up";
                $delta    *= $delta_mult;
                break;
            case 'up':
                $pos_y    -= $delta;
                $direction = "right";
                $delta    *= $delta_mult;
                 break;
            }
        }
    }

    /**
     * update X and Y coordinates for a table
     *
     * @param string db The database name
     * @param array cfgRelation relation settings
     * @return void
     * @access private
     */
    private function _editCoordinates($db, $cfgRelation,$query_default_option)
    {
        for ($i = 0; $i < $this->c_table_rows; $i++) {
            $arrvalue = 'c_table_' . $i;
            global $$arrvalue;
            $arrvalue = $$arrvalue;
            if (!isset($arrvalue['x']) || $arrvalue['x'] == '') {
                $arrvalue['x'] = 0;
            }
            if (!isset($arrvalue['y']) || $arrvalue['y'] == '') {
                $arrvalue['y'] = 0;
            }
            if (isset($arrvalue['name']) && $arrvalue['name'] != '--') {
                $test_query = 'SELECT * FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords'])
                            .   ' WHERE db_name = \'' .  PMA_sqlAddslashes($db) . '\''
                            .   ' AND   table_name = \'' . PMA_sqlAddslashes($arrvalue['name']) . '\''
                            .   ' AND   pdf_page_number = \'' . PMA_sqlAddslashes($this->chosenPage) . '\'';
                $test_rs    = PMA_query_as_controluser($test_query, FALSE, $query_default_option);
                //echo $test_query;
                if ($test_rs && PMA_DBI_num_rows($test_rs) > 0) {
                    if (isset($arrvalue['delete']) && $arrvalue['delete'] == 'y') {
                        $ch_query = 'DELETE FROM ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords'])
                                  .   ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\''
                                  .   ' AND   table_name = \'' . PMA_sqlAddslashes($arrvalue['name']) . '\''
                                  .   ' AND   pdf_page_number = \'' . PMA_sqlAddslashes($this->chosenPage) . '\'';
                    } else {
                        $ch_query = 'UPDATE ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords']) . ' '
                                  . 'SET x = ' . $arrvalue['x'] . ', y= ' . $arrvalue['y']
                                  .   ' WHERE db_name = \'' . PMA_sqlAddslashes($db) . '\''
                                  .   ' AND   table_name = \'' . PMA_sqlAddslashes($arrvalue['name']) . '\''
                                  .   ' AND   pdf_page_number = \'' . PMA_sqlAddslashes($this->chosenPage) . '\'';
                    }
                } else {
                    $ch_query     = 'INSERT INTO ' . PMA_backquote($GLOBALS['cfgRelation']['db']) . '.' . PMA_backquote($cfgRelation['table_coords']) . ' '
                                  . '(db_name, table_name, pdf_page_number, x, y) '
                                  . 'VALUES (\'' . PMA_sqlAddslashes($db) . '\', \'' . PMA_sqlAddslashes($arrvalue['name']) . '\', \'' . PMA_sqlAddslashes($this->chosenPage) . '\',' . $arrvalue['x'] . ',' . $arrvalue['y'] . ')';
                }
                //echo $ch_query;
                PMA_query_as_controluser($ch_query, FALSE, $query_default_option);
            } // end if
        } // end for
    }
}
?>