<?php
/* For licensing terms, see /license.txt */
/**
 * @package chamilo.library
 */
/**
 * Code
 */
require_once 'pear/HTML/Table.php';
require_once 'pear/Pager/Pager.php';
//require_once 'tablesort.lib.php'; moved to autoload table_sort.class.php
/**
 * This class allows you to display a sortable data-table. It is possible to
 * split the data in several pages.
 * Using this class you can:
 * - automatically create checkboxes of the first table column
 *     - a "select all" and "deselect all" link is added
 *     - only if you provide a list of actions for the selected items
 * - click on the table header to sort the data
 * - choose how many items you see per page
 * - navigate through all data-pages
 * @package chamilo.library
 */
class SortableTable extends HTML_Table {
    /**
     * A name for this table
     */
    public $table_name;
    /**
     * The page to display
     */
    public $page_nr;
    /**
     * The column to sort the data
     */
    public $column;
    /**
     * The sorting direction (ASC or DESC)
     */
    public $direction;
    /**
     * Number of items to display per page
     */
    public $per_page;
    /**
     * The default number of items to display per page
     */
    public $default_items_per_page;
    /**
     * A prefix for the URL-parameters, can be used on pages with multiple
     * SortableTables
     */
    public $param_prefix;
    /**
     * The pager object to split the data in several pages
     */
    public $pager;
    /**
     * The total number of items in the table
     */
    public $total_number_of_items;
    /**
     * The function to get the total number of items
     */
    public $get_total_number_function;
    /**
     * The function to the the data to display
     */
    public $get_data_function;
    /**
     * An array with defined column-filters
     */
    public $column_filters;
    /**
     * A list of actions which will be available through a select list
     */
    public $form_actions;
    /**
     * Additional parameters to pass in the URL
     */
    public $additional_parameters;
    /**
     * Additional attributes for the th-tags
     */
    public $th_attributes;
    /**
     * Additional attributes for the td-tags
     */
    public $td_attributes;
    /**
     * Array with names of the other tables defined on the same page of this
     * table
     */
    public $other_tables;
    /**
     * Activates the odd even rows
     * **/
    public $odd_even_rows_enabled = true;
    public $use_jqgrid = false;
    public $table_id = null;
    public $headers = array();

    /**
     * Create a new SortableTable
     * @param string $table_name A name for the table (default = 'table')
     * @param string $get_total_number_function A user defined function to get
     * the total number of items in the table
     * @param string $get_data_function A function to get the data to display on
     * the current page
     * @param int $default_column The default column on which the data should be
     * sorted
     * @param int $default_items_per_page The default number of items to show
     * on one page
     * @param string $default_order_direction The default order direction;
     * either the constant 'ASC' or 'DESC'
     */
    public function __construct(
        $table_name = 'table',
        $get_total_number_function = null,
        $get_data_function = null,
        $default_column = 1,
        $default_items_per_page = 20,
        $default_order_direction = 'ASC',
        $table_id = null
    ) {
        if (empty($table_id)) {
            $table_id = $table_name.uniqid();
        }
        $this->table_id = $table_id;

        parent :: __construct(array ('class' => 'data_table', 'id' => $table_id));
        $this->table_name = $table_name;
        $this->additional_parameters = array ();
        $this->param_prefix = $table_name.'_';

        $this->page_nr = isset ($_SESSION[$this->param_prefix.'page_nr']) ? intval($_SESSION[$this->param_prefix.'page_nr']) : 1;
        $this->page_nr = isset ($_GET[$this->param_prefix.'page_nr'])       ? intval($_GET[$this->param_prefix.'page_nr']) : $this->page_nr;
        $this->column  = isset ($_SESSION[$this->param_prefix.'column'])  ? intval($_SESSION[$this->param_prefix.'column']) : $default_column;
        $this->column  = isset ($_GET[$this->param_prefix.'column'])       ? intval($_GET[$this->param_prefix.'column']) : $this->column;

        //Default direction

        if (in_array(strtoupper($default_order_direction), array('ASC', 'DESC'))) {
            $this->direction = $default_order_direction;
        }

        if (isset($_SESSION[$this->param_prefix.'direction'])) {
            $my_session_direction = $_SESSION[$this->param_prefix.'direction'];
            if (!in_array($my_session_direction, array('ASC', 'DESC'))) {
                $this->direction = 'ASC';
            } else {
                if ($my_session_direction == 'ASC') {
                    $this->direction = 'ASC';
                } elseif ($my_session_direction == 'DESC') {
                    $this->direction = 'DESC';
                }
            }
        }

        if (isset($_GET[$this->param_prefix.'direction'])) {
            $my_get_direction = $_GET[$this->param_prefix.'direction'];
            if (!in_array($my_get_direction, array('ASC', 'DESC'))){
                $this->direction = 'ASC';
            } else {
                if ($my_get_direction == 'ASC') {
                    $this->direction = 'ASC';
                } elseif ($my_get_direction == 'DESC') {
                    $this->direction = 'DESC';
                }
            }
        }


        // Allow to change paginate in multiples tabs
        unset($_SESSION[$this->param_prefix.'per_page']);

        $this->per_page = isset ($_SESSION[$this->param_prefix.'per_page']) ? intval($_SESSION[$this->param_prefix.'per_page']) : $default_items_per_page;
        $this->per_page = isset ($_GET[$this->param_prefix.'per_page'])        ? intval($_GET[$this->param_prefix.'per_page']) : $this->per_page;

        $_SESSION[$this->param_prefix.'per_page']  = $this->per_page;
        $_SESSION[$this->param_prefix.'direction'] = $this->direction ;
        $_SESSION[$this->param_prefix.'page_nr']   = $this->page_nr;
        $_SESSION[$this->param_prefix.'column']    = $this->column;
        $this->pager                               = null;
        $this->default_items_per_page              = $default_items_per_page;
        $this->total_number_of_items               = -1;
        $this->get_total_number_function           = $get_total_number_function;
        $this->get_data_function                   = $get_data_function;
        $this->column_filters                      = array();
        $this->form_actions                        = array();
        $this->checkbox_name                       = null;
        $this->td_attributes                       = array();
        $this->th_attributes                       = array();
        $this->other_tables                        = array();
    }

    /**
     * Get the Pager object to split the showed data in several pages
     */
    public function get_pager()
    {
        if (is_null($this->pager)) {
            $total_number_of_items   = $this->get_total_number_of_items();
            $params['mode']          = 'Sliding';
            $params['perPage']       = $this->per_page;
            $params['totalItems']    = $total_number_of_items;
            $params['urlVar']        = $this->param_prefix.'page_nr';
            $params['currentPage']   = $this->page_nr;
            $icon_attributes         = array('style' => 'vertical-align: middle;');
            $params['prevImg']       = Display :: return_icon('action_prev.png', get_lang('PreviousPage'), $icon_attributes);
            $params['nextImg']       = Display :: return_icon('action_next.png', get_lang('NextPage'), $icon_attributes);
            $params['firstPageText'] = Display :: return_icon('action_first.png', get_lang('FirstPage'), $icon_attributes);
            $params['lastPageText']  = Display :: return_icon('action_last.png', get_lang('LastPage'), $icon_attributes);
            $params['firstPagePre']  = '';
            $params['lastPagePre']   = '';
            $params['firstPagePost'] = '';
            $params['lastPagePost']  = '';
            $params['spacesBeforeSeparator'] = '';
            $params['spacesAfterSeparator']  = '';
            $query_vars = array_keys($_GET);
            $query_vars_needed = array ($this->param_prefix.'column', $this->param_prefix.'direction', $this->param_prefix.'per_page');
            if (count($this->additional_parameters) > 0) {
                $query_vars_needed = array_merge($query_vars_needed, array_keys($this->additional_parameters));
            }
            $query_vars_exclude = array_diff($query_vars, $query_vars_needed);
            $params['excludeVars'] = $query_vars_exclude;
            $this->pager = & Pager::factory($params);
        }
        return $this->pager;
    }

    public function display() {
        echo $this->return_table();
    }
    /**
     * Displays the table, complete with navigation buttons to browse through
     * the data-pages.
     */
    public function return_table() {
        $empty_table = false;
        $content = $this->get_table_html();

        if ($this->get_total_number_of_items() == 0) {
            $cols = $this->getColCount();
            $this->setCellAttributes(1, 0, 'style="font-style: italic;text-align:center;" colspan='.$cols);
            $message_empty = api_xml_http_response_encode(get_lang('TheListIsEmpty'));
            $this->setCellContents(1, 0, $message_empty);
            $empty_table = true;
        }
        $html = '';
        if (!$empty_table) {
            $table_id = 'form_'.$this->table_name.'_id';
            $form  = $this->get_page_select_form();
            $nav   = $this->get_navigation_html();

            //Only show pagination info when there are items to paginate

            if ($this->get_total_number_of_items() > $this->default_items_per_page) {
                $html  = '<table class="data_table_pagination">';
                $html .= '<tr>';
                $html .= '<td style="width:25%;">';
                $html .= $form;
                $html .= '</td>';
                $html .= '<td style="text-align:center;">';
                $html .= $this->get_table_title();
                $html .= '</td>';
                $html .= '<td style="text-align:right;width:25%;">';
                $html .= $nav;
                $html .= '</td>';
                $html .= '</tr>';
                $html .= '</table>';
            }

            if (count($this->form_actions) > 0) {
                $params = $this->get_sortable_table_param_string().'&amp;'.$this->get_additional_url_paramstring();
                $html .= '<form id ="'.$table_id.'" class="form-search" method="post" action="'.api_get_self().'?'.$params.'" name="form_'.$this->table_name.'">';
            }
        }

        $html .= $content;

        if (!$empty_table) {
            if (!empty($this->additional_parameters)) {
                foreach($this->additional_parameters as $key => $value) {
                    $html .= '<input type="hidden" name ="'.Security::remove_XSS($key).'" value ="'.Security::remove_XSS($value).'" />';
                }
            }
            $html .= '<input type="hidden" name="action">';
            $html .= '<table style="width:100%;">';
            $html .= '<tr>';
            $html .= '<td>';

            if (count($this->form_actions) > 0) {

                $html .= '<div class="btn-toolbar">';
                $html .= '<div class="btn-group">';
                $html .= '<a class="btn" href="?'.$params.'&amp;'.$this->param_prefix.'selectall=1" onclick="javascript: setCheckbox(true, \''.$table_id.'\'); return false;">'.get_lang('SelectAll').'</a>';
                $html .= '<a class="btn" href="?'.$params.'" onclick="javascript: setCheckbox(false, \''.$table_id.'\'); return false;">'.get_lang('UnSelectAll').'</a> ';
                $html .= '</div>';
                $html .= '<div class="btn-group">
                                <button class="btn" onclick="javascript:return false;">'.get_lang('Actions').'</button>
                                <button class="btn dropdown-toggle" data-toggle="dropdown">
                                    <span class="caret"></span>
                                </button>';
                $html .= '<ul class="dropdown-menu">';
                foreach ($this->form_actions as $action => & $label) {
                    $html .= '<li><a data-action ="'.$action.'" href="#" onclick="javascript:action_click(this, \''.$table_id.'\');">'.$label.'</a></li>';
                }
                $html .= '</ul>';
                $html .= '</div>';//btn-group
                $html .= '</div>'; //toolbar
            } else {
                $html .= $form;
            }

            $html .= '</td>';

            if ($this->get_total_number_of_items() > $this->default_items_per_page) {
                $html .= '<td style="text-align:right;">';
                $html .= $nav;
                $html .= '</td>';
            }else{
                $html .= '<td> ';
                $html .= '</td>';
            }

            $html .= '</tr>';
            $html .= '</table>';
            if (count($this->form_actions) > 0) {
                $html .= '</form>';
            }
        }
        return $html;
    }

    /**
     * This function shows the content of a table in a grid.
     * Should not be use to edit information (edit/delete rows) only.
     * */
    public function display_grid() {

        $empty_table = false;
        if ($this->get_total_number_of_items() == 0) {
            $cols = $this->getColCount();
            //$this->setCellAttributes(1, 0, 'style="font-style: italic;text-align:center;" colspan='.$cols);
            $message_empty = api_xml_http_response_encode(get_lang('TheListIsEmpty'));
            $this->setCellContents(1, 0, $message_empty);
            $empty_table = true;
        }
        $html = '';
        if (!$empty_table) {
            $form = $this->get_page_select_form();
            $nav  = $this->get_navigation_html();

            // @todo This style css must be moved to default.css only for dev
            echo '<style>
                    .main-grid { width:100%;}
                    .sub-header { width:100%; padding-top: 10px; padding-right: 10px; padding-left: 10px; height:30px;}
                    .grid_container { width:100%;}
                    .grid_item { height: 120px; width:98px;  float:left; padding:5px; margin:8px;}
                    .grid_element_0 { width:100px; height: 100px; float:left; text-align:center; margin-bottom:5px;}
                    .grid_element_1 { width:100px; float:left; text-align:center;margin-bottom:5px;}
                    .grid_element_2 { width:150px; float:left;}

                    .grid_selectbox { width:30%; float:left;}
                    .grid_title     { width:30%; float:left;}
                    .grid_nav         { }
            </style>';

            // @todo  This also must be moved

            // Show only navigations if there are more than 1 page
            $my_pager = $this->get_pager();

            $html .= '<div class="main-grid">';

            if ($my_pager->numPages() > 1) {
                $html .= '<div class="sub-header">';
                $html .= '<div class="grid_selectbox">'.$form.'</div>';
                $html .= '<div class="grid_title">'.$this->get_table_title().'</div>';
                $html .= '<div class="grid_nav">'.$nav.'</div>';
                $html .= '</div>';
            }

            $html .= '<div class="clear"></div>';
            if (count($this->form_actions) > 0) {
                $script= '<script>
                            /*<![CDATA[*/
                            function setCheckbox(value) {
                                 d = document.form_'.$this->table_name.';
                                 for (i = 0; i < d.elements.length; i++) {
                                       if (d.elements[i].type == "checkbox") {
                                         d.elements[i].checked = value;
                                       }
                                    if (value) {
                                        $(d.elements[i]).parentsUntil("tr").parent().addClass("row_selected");
                                    } else {
                                        $(d.elements[i]).parentsUntil("tr").parent().removeClass("row_selected");
                                    }
                                 }
                            }
                            /*]]>*/
                        </script>';
                $params = $this->get_sortable_table_param_string().'&amp;'.$this->get_additional_url_paramstring();
                $html .= '<form method="post" action="'.api_get_self().'?'.$params.'" name="form_'.$this->table_name.'">';
            }
        }
        // Getting the items of the table
        $items = $this->get_clean_html(false);    //no sort

        // Generation of style classes must be improved. Maybe we need a a table name to create style on the fly:
        // i.e: .whoisonline_table_grid_container instead of  .grid_container
        // where whoisonline is the table's name like drupal's template engine

        $html .= '<div class="grid_container">';
        if (is_array($items) && count($items) > 0) {
            foreach ($items as & $row) {
                $html .= '<div class="grid_item">';
                $i = 0;
                foreach ($row as & $element) {
                    $html .= '<div class="grid_element_'.$i.'">'.$element.'</div>';
                    $i++;
                }
                $html .= '</div>';
            }
        }
        $html .= '</div>'; //close grid_container

        $html .= '</div>'; //close main grid


        $html .= '<div class="clear"></div>';
        /*
        if (!$empty_table) {
            $html .= '<table style="width:100%;">';
            $html .= '<tr>';
            $html .= '<td colspan="2">';
            if (count($this->form_actions) > 0) {
                $html .= '<br />';
                $html .= '<a href="?'.$params.'&amp;'.$this->param_prefix.'selectall=1" onclick="javascript:setCheckbox(true);return false;">'.get_lang('SelectAll').'</a> - ';
                $html .= '<a href="?'.$params.'" onclick="javascript:setCheckbox(false);return false;">'.get_lang('UnSelectAll').'</a> ';
                $html .= '<select name="action">';
                foreach ($this->form_actions as $action => $label) {
                    $html .= '<option value="'.$action.'">'.$label.'</option>';
                }
                $html .= '</select>';
                $html .= '&nbsp;&nbsp;<button type="submit" class="save" onclick="javascript: if(!confirm('."'".addslashes(api_htmlentities(get_lang("ConfirmYourChoice"),ENT_QUOTES))."'".')) return false;">'.get_lang('Select').'</button>';
            } else {
                $html .= $form;
            }
            $html .= '</td>';
            $html .= '<td style="text-align:right;">';
            $html .= $nav;
            $html .= '</td>';
            $html .= '</tr>';
            $html .= '</div>';
            if (count($this->form_actions) > 0) {
                $html .= '</form>';
            }
        }
        */
        echo $html;
    }

    /**
     * This function returns the content of a table in a grid
     * Should not be use to edit information (edit/delete rows) only.
     * @param array      options of visibility
     * @param bool       hide navigation optionally
     * @param int        content per page when show navigation (optional)
     * @param bool         sort data optionally
     * @return string    grid html
     */
    public function display_simple_grid($visibility_options, $hide_navigation = true, $per_page = 20, $sort_data = true, $grid_class = array()) {

        $empty_table = false;
        if ($this->get_total_number_of_items() == 0) {
            $cols = $this->getColCount();
            //$this->setCellAttributes(1, 0, 'style="font-style: italic;text-align:center;" colspan='.$cols);
            $message_empty = api_xml_http_response_encode(get_lang('TheListIsEmpty'));
            $this->setCellContents(1, 0, $message_empty);
            $empty_table = true;
        }
        $html = '';
        if (!$empty_table) {
            // If we show the pagination
            if (!$hide_navigation) {
                $form = '&nbsp;';
                if ($this->get_total_number_of_items() > $per_page) {
                    if ($per_page > 10) {
                        $form = $this->get_page_select_form();
                    }
                    $nav = $this->get_navigation_html();
                    // This also must be moved
                    $html = '<div class="sub-header">';
                    $html .= '<div class="grid_selectbox">'.$form.'</div>';
                    $html .= '<div class="grid_title">'.$this->get_table_title().'</div>';
                    $html .= '<div class="grid_nav">'.$nav.'</div>';
                    $html .= '</div>';
                }
            }

            $html .= '<div class="clear"></div>';
            if (count($this->form_actions) > 0) {
                $script= '<script>
                            /*<![CDATA[*/
                            function setCheckbox(value) {
                                 d = document.form_'.$this->table_name.';
                                 for (i = 0; i < d.elements.length; i++) {
                                       if (d.elements[i].type == "checkbox") {
                                         d.elements[i].checked = value;
                                       }
                                    if (value) {
                                        $(d.elements[i]).parentsUntil("tr").parent().addClass("row_selected");
                                    } else {
                                        $(d.elements[i]).parentsUntil("tr").parent().removeClass("row_selected");
                                    }
                                 }
                            }
                            /*]]>*/
                        </script>';
                $params = $this->get_sortable_table_param_string().'&amp;'.$this->get_additional_url_paramstring();
                $html .= '<form method="post" action="'.api_get_self().'?'.$params.'" name="form_'.$this->table_name.'">';
            }
        }

        if ($hide_navigation) {
            $items = $this->table_data; // This is a faster way to get what we want
        } else {
            // The normal way
            $items = $this->get_clean_html($sort_data); // Getting the items of the table
        }

        // Generation of style classes must be improved. Maybe we need a a table name to create style on the fly:
        // i.e: .whoisonline_table_grid_container instead of  .grid_container
        // where whoisonline is the table's name like drupal's template engine

        if (is_array($visibility_options)) {
            $filter = false; // The 2nd condition of the if will be loaded
        } else {
            $filter = $visibility_options !== false;
        }

        $item_css_class = $item_css_style = $grid_css_class = $grid_css_style = '';
        if (!empty($grid_class)) {
            $grid_css_class = $grid_class['main']['class'];
            $item_css_class = $grid_class['item']['class'];

            $grid_css_style = isset($grid_class['main']['style']) ? $grid_class['main']['style'] : null;
            $item_css_style = isset($grid_class['item']['style']) ? $grid_class['item']['style'] : null;
        }

        $div = '';
        if (is_array($items) && count($items) > 0) {
            foreach ($items as & $row) {
                $i = 0;
                $rows = '';
                foreach ($row as & $element) {
                    if ($filter || $visibility_options[$i]) {
                        $rows .= '<div class="'.$this->table_name.'_grid_element_'.$i.'">'.$element.'</div>';
                    }
                    $i++;
                }
                $div .= Display::div($rows, array('class'=>$item_css_class.' '.$this->table_name.'_grid_item', 'style' => $item_css_style));
            }
        }

        $html .= Display::div($div, array('class'=>$grid_css_class.' '.$this->table_name.'_grid_container', 'style' => $grid_css_style));
        $html .= '<div class="clear"></div>';
        return $html;
    }

    /**
     * Get the HTML-code with the navigational buttons to browse through the
     * data-pages.
     */
    public function get_navigation_html () {
        $pager          = $this->get_pager();
        $pager_links    = $pager->getLinks();

        $nav            = $pager_links['first'].' '.$pager_links['back'];
        $nav            .= ' '.$pager->getCurrentPageId().' / '.$pager->numPages().' ';
        $nav            .= $pager_links['next'].' '.$pager_links['last'];
        return $nav;
    }

    /**
     * Get the HTML-code with the data-table.
     */
    public function get_table_html() {
        $pager    = $this->get_pager();
        $offset   = $pager->getOffsetByPageId();
        $from     = $offset[0] - 1;

        $table_data = $this->get_table_data($from);

        if (is_array($table_data)) {
            $count = 1;
            foreach ($table_data as & $row) {
                $row = $this->filter_data($row);
                $this->addRow($row);
                if (isset($row['child_of'])) {
                    $this->setRowAttributes($count, array('class' => 'hidden hidden_'.$row['child_of']), true);
                }
                $count++;
            }
        }

        if ($this->odd_even_rows_enabled == true) {
            $this->altRowAttributes(0, array ('class' => 'row_odd'), array ('class' => 'row_even'), true);
        }

        foreach ($this->th_attributes as $column => $attributes) {
            $this->setCellAttributes(0, $column, $attributes);
        }
        foreach ($this->td_attributes as $column => $attributes) {
            $this->setColAttributes($column, $attributes);
        }
        return $this->toHTML();
    }

    /**
     * This function return the items of the table
     * @param bool true for sorting table data or false otherwise
     * @return array table row items
     */
    public function get_clean_html($sort = true) {
        $pager    = $this->get_pager();
        $offset   = $pager->getOffsetByPageId();
        $from     = $offset[0] - 1;

        $table_data = $this->get_table_data($from, null, null, null, $sort);

        $new_table_data = array();
        if (is_array($table_data)) {
            foreach ($table_data as $index => & $row) {
                $row = $this->filter_data($row);
                $new_table_data[] = $row;
            }
        }
        return $new_table_data;
    }

    /**
     * Get the HTML-code wich represents a form to select how many items a page
     * should contain.
     */
    public function get_page_select_form () {
        $total_number_of_items = $this->get_total_number_of_items();
        if ($total_number_of_items <= $this->default_items_per_page) {
            return '';
        }
        $result[] = '<form method="GET" action="'.api_get_self().'" style="display:inline;">';
        $param[$this->param_prefix.'direction'] = $this->direction;
        $param[$this->param_prefix.'page_nr'] = $this->page_nr;
        $param[$this->param_prefix.'column'] = $this->column;

        if (is_array($this->additional_parameters)) {
            $param = array_merge($param, $this->additional_parameters);
        }

        foreach ($param as $key => & $value) {
            $result[] = '<input type="hidden" name="'.$key.'" value="'.$value.'"/>';
        }
        $result[] = '<select name="'.$this->param_prefix.'per_page" onchange="javascript: this.form.submit();">';
        for ($nr = 10; $nr <= min(50, $total_number_of_items); $nr += 10) {
            $result[] = '<option value="'.$nr.'" '. ($nr == $this->per_page ? 'selected="selected"' : '').'>'.$nr.'</option>';
        }
        // @todo no limits
        //if ($total_number_of_items < 500) {
        $result[] = '<option value="'.$total_number_of_items.'" '. ($total_number_of_items == $this->per_page ? 'selected="selected"' : '').'>'.api_ucfirst(get_lang('All')).'</option>';
        //}
        $result[] = '</select>';
        $result[] = '<noscript>';
        $result[] = '<button class="btn save" type="submit">'.get_lang('Save').'</button>';
        $result[] = '</noscript>';
        $result[] = '</form>';
        $result = implode("\n", $result);
        return $result;
    }

    /**
     * Get the table title.
     */
    public function get_table_title () {
        $pager = $this->get_pager();
        $showed_items = $pager->getOffsetByPageId();
        return $showed_items[0].' - '.$showed_items[1].' / '.$this->get_total_number_of_items();
    }

    /**
     * Set the header-label
     * @param int $column The column number
     * @param string $label The label
     * @param boolean $sortable Is the table sortable by this column? (defatult
     * = true)
     * @param string $th_attributes Additional attributes for the th-tag of the
     * table header
     * @param string $td_attributes Additional attributes for the td-tags of the
     * column
     */
    public function set_header ($column, $label, $sortable = true, $th_attributes = null, $td_attributes = null) {
        $param['direction'] = 'ASC';
        if ($this->column == $column && $this->direction == 'ASC') {
            $param['direction'] = 'DESC';
        }
        $param['page_nr'] = $this->page_nr;
        $param['per_page'] = $this->per_page;
        $param['column'] = $column;
        if ($sortable) {
            $link = '<a href="'.api_get_self().'?'.api_get_cidreq().'&amp;';
            foreach ($param as $key => & $value) {
                $link .= $this->param_prefix.$key.'='.urlencode($value).'&amp;';
            }
            $link .= $this->get_additional_url_paramstring();
            $link .= '">'.$label.'</a>';
            if ($this->column == $column) {
                $link .= $this->direction == 'ASC' ? ' &#8595;' : ' &#8593;';
            }
        } else {
            $link = $label;
        }
        $this->setHeaderContents(0, $column, $link);
        if (!is_null($td_attributes)) {
            $this->td_attributes[$column] = $td_attributes;
        }
        if (!is_null($th_attributes)) {
            $this->th_attributes[$column] = $th_attributes;
        }
    }

    /**
     * Get the parameter-string with additional parameters to use in the URLs
     * generated by this SortableTable
     */
    public function get_additional_url_paramstring () {
        $param_string_parts = array ();
        if (is_array($this->additional_parameters) && count($this->additional_parameters) > 0) {
            foreach ($this->additional_parameters as $key => & $value) {
                $param_string_parts[] = urlencode($key).'='.urlencode($value);
            }
        }
        $result = implode('&amp;', $param_string_parts);
        foreach ($this->other_tables as $index => & $tablename) {
            $param = array();
            if (isset($_GET[$tablename.'_direction'])) {
                //$param[$tablename.'_direction'] = $_GET[$tablename.'_direction'];
                $my_get_direction = $_GET[$tablename.'_direction'];
                if (!in_array($my_get_direction, array('ASC', 'DESC'))) {
                    $param[$tablename.'_direction'] =  'ASC';
                } else {
                    $param[$tablename.'_direction'] = $my_get_direction;
                }
            }
            if (isset($_GET[$tablename.'_page_nr'])) {
                $param[$tablename.'_page_nr'] = intval($_GET[$tablename.'_page_nr']);
            }
            if (isset($_GET[$tablename.'_per_page'])) {
                $param[$tablename.'_per_page'] = intval($_GET[$tablename.'_per_page']);
            }
            if (isset($_GET[$tablename.'_column'])) {
                $param[$tablename.'_column'] = intval($_GET[$tablename.'_column']);
            }
            $param_string_parts = array ();
            foreach ($param as $key => & $value) {
                $param_string_parts[] = urlencode($key).'='.urlencode($value);
            }
            if (count($param_string_parts) > 0)
                $result .= '&amp;'.implode('&amp;', $param_string_parts);
        }
        return $result;
    }

    /**
     * Get the parameter-string with the SortableTable-related parameters to use
     * in URLs
     */
    public function get_sortable_table_param_string () {
        $param[$this->param_prefix.'direction'] = $this->direction;
        $param[$this->param_prefix.'page_nr'] = $this->page_nr;
        $param[$this->param_prefix.'per_page'] = $this->per_page;
        $param[$this->param_prefix.'column'] = $this->column;
        $param_string_parts = array ();
        foreach ($param as $key => & $value) {
            $param_string_parts[] = urlencode($key).'='.urlencode($value);
        }
        $res = implode('&amp;', $param_string_parts);
        return $res;
    }

    /**
     * Add a filter to a column. If another filter was allready defined for the
     * given column, it will be overwritten.
     * @param int $column The number of the column
     * @param string $function The name of the filter-function. This should be a
     * function wich requires 1 parameter and returns the filtered value.
     */
    public function set_column_filter ($column, $function) {
        $this->column_filters[$column] = $function;
    }

    /**
     * Define a list of actions which can be performed on the table-date.
     * If you define a list of actions, the first column of the table will be
     * converted into checkboxes.
     * @param array $actions A list of actions. The key is the name of the
     * action. The value is the label to show in the select-box
     * @param string $checkbox_name The name of the generated checkboxes. The
     * value of the checkbox will be the value of the first column.
     */
    public function set_form_actions ($actions, $checkbox_name = 'id') {
        $this->form_actions = $actions;
        $this->checkbox_name = $checkbox_name;
    }

    /**
     * Define a list of additional parameters to use in the generated URLs
     * <code>$parameters['action'] = 'test'; will be convert in <input type="hidden" name="action" value="test"></code>
     * @param array $parameters
     */
    public function set_additional_parameters ($parameters) {
        $this->additional_parameters = $parameters;
    }
    /**
     * Set other tables on the same page.
     * If you have other sortable tables on the page displaying this sortable
     * tables, you can define those other tables with this function. If you
     * don't define the other tables, there sorting and pagination will return
     * to their default state when sorting this table.
     * @param array $tablenames An array of table names.
     */
    public function set_other_tables ($tablenames) {
        $this->other_tables = $tablenames;
    }

    /**
     * Transform all data in a table-row, using the filters defined by the
     * function set_column_filter(...) defined elsewhere in this class.
     * If you've defined actions, the first element of the given row will be
     * converted into a checkbox
     * @param array $row A row from the table.
     */
    public function filter_data ($row) {
        $url_params = $this->get_sortable_table_param_string().'&amp;'.$this->get_additional_url_paramstring();
        foreach ($this->column_filters as $column => & $function) {
            $row[$column] = call_user_func($function, $row[$column], $url_params, $row);
        }
        if (count($this->form_actions) > 0) {
            if (strlen($row[0]) > 0) {
                $row[0] = '<input type="checkbox" name="'.$this->checkbox_name.'[]" value="'.$row[0].'"';
                if (isset($_GET[$this->param_prefix.'selectall'])) {
                    $row[0] .= ' checked="checked"';
                }
                $row[0] .= '/>';
            }
        }

        foreach ($row as $index => & $value) {
            if (empty($value)) {
                $value = '-';
            }
        }
        return $row;
    }

    /**
     * Get the total number of items. This function calls the function given as
     * 2nd argument in the constructor of a SortableTable. Make sure your
     * function has the same parameters as defined here.
     */
    public function get_total_number_of_items ()
    {
        if ($this->total_number_of_items == -1 && !is_null($this->get_total_number_function)) {
            $this->total_number_of_items = call_user_func($this->get_total_number_function);
        }
        return $this->total_number_of_items;
    }

    /**
     * Get the data to display.  This function calls the function given as
     * 2nd argument in the constructor of a SortableTable. Make sure your
     * function has the same parameters as defined here.
     * @param int $from Index of the first item to return.
     * @param int $per_page The number of items to return
     * @param int $column The number of the column on which the data should be
     * @param bool $sort Whether to sort or not
     * sorted
     * @param string $direction In which order should the data be sorted (ASC
     * or DESC)
     */
    public function get_table_data ($from = null, $per_page = null, $column = null, $direction = null, $sort = null) {
        if (!is_null($this->get_data_function)) {
            return call_user_func($this->get_data_function, $from, $this->per_page, $this->column, $this->direction);
        }
        return array ();
    }
}

/**
 * Sortable table which can be used for data available in an array
 * @package chamilo.library
 */
class SortableTableFromArray extends SortableTable {
    /**
     * The array containing all data for this table
     */
    public $table_data;

    /**
     * Constructor
     * @param array $table_data
     * @param int $default_column
     * @param int $default_items_per_page
     */
    public function __construct($table_data, $default_column = 1, $default_items_per_page = 20, $tablename = 'tablename') {
        parent :: __construct ($tablename, null, null, $default_column, $default_items_per_page);
        $this->table_data = $table_data;
    }

    /**
     * Get table data to show on current page
     * @see SortableTable#get_table_data
     */
    public function get_table_data($from = 1, $per_page = null, $column = null, $direction = null, $sort = true) {
        if ($sort) {
            $content = TableSort :: sort_table($this->table_data, $this->column, $this->direction == 'ASC' ? SORT_ASC : SORT_DESC);
        } else {
            $content = $this->table_data;
        }
        return array_slice($content, $from, $this->per_page);
    }

    /**
     * Get total number of items
     * @see SortableTable#get_total_number_of_items
     */
    public function get_total_number_of_items() {
        return count($this->table_data);
    }
}


/**
 * Sortable table which can be used for data available in an array
 *
 * Is a variation of SortableTableFromArray because we add 2 new arrays  $column_show and $column_order
 * $column_show is an array that lets us decide which are going to be the columns to show
 * $column_order is an array that lets us decide the ordering of the columns
 * i.e: $column_header=array('a','b','c','d','e'); $column_order=array(1,2,5,4,5);
 * These means that the 3th column (letter "c") will be sort like the order we use in the 5th column
 * @package chamilo.library
 */

class SortableTableFromArrayConfig extends SortableTable {
    /**
     * The array containing the columns that will be show i.e $column_show=array('1','0','0'); we will show only the 1st column
     */
    private $column_show;

    /**
     *The array containing the real sort column $column_order=array('1''4','3','4'); The 2nd column will be order like the 4th column
     */
    private $column_order;
    /**
     * The array containing all data for this table
     */
    private $table_data;

    private $doc_filter;

    /**
     * Constructor
     * @param array $table_data All the information of the table
     * @param int $default_column Default column that will be use in the sorts functions
     * @param int $default_items_per_page quantity of pages that we are going to see
     * @param int $tablename Name of the table
     * @param array $column_show An array with binary values 1: we show the column 2: we don't show it
     * @param array $column_order An array of integers that let us decide how the columns are going to be sort.
     * @param bool special modification to fix the document name order
     */
    public function __construct ($table_data, $default_column = 1, $default_items_per_page = 20, $tablename = 'tablename', $column_show = null, $column_order = null, $direction = 'ASC', $doc_filter = false) {
        $this->column_show  = $column_show;
        $this->column_order = $column_order;
        $this->doc_filter   = $doc_filter;
        parent :: __construct ($tablename, null, null, $default_column, $default_items_per_page, $direction);
        $this->table_data = $table_data;
    }

    /**
     * Get table data to show on current page
     * @see SortableTable#get_table_data
     */
    public function get_table_data($from = 1, $per_page = null, $column = null, $direction = null, $sort = true) {
        $content = TableSort :: sort_table_config($this->table_data, $this->column, $this->direction == 'ASC' ? SORT_ASC : SORT_DESC, $this->column_show, $this->column_order, SORT_REGULAR, $this->doc_filter);
        return array_slice($content, $from, $this->per_page);
    }

    /**
     * Get total number of items
     * @see SortableTable#get_total_number_of_items
     */
    public function get_total_number_of_items() {
        return count($this->table_data);
    }
}