/mod/data/lib.php

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<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @package   mod_data
 * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

// Some constants
define ('DATA_MAX_ENTRIES', 50);
define ('DATA_PERPAGE_SINGLE', 1);

define ('DATA_FIRSTNAME', -1);
define ('DATA_LASTNAME', -2);
define ('DATA_APPROVED', -3);
define ('DATA_TIMEADDED', 0);
define ('DATA_TIMEMODIFIED', -4);
define ('DATA_TAGS', -5);

define ('DATA_CAP_EXPORT', 'mod/data:viewalluserpresets');

define('DATA_PRESET_COMPONENT', 'mod_data');
define('DATA_PRESET_FILEAREA', 'site_presets');
define('DATA_PRESET_CONTEXT', SYSCONTEXTID);

define('DATA_EVENT_TYPE_OPEN', 'open');
define('DATA_EVENT_TYPE_CLOSE', 'close');

// Users having assigned the default role "Non-editing teacher" can export database records
// Using the mod/data capability "viewalluserpresets" existing in Moodle 1.9.x.
// In Moodle >= 2, new roles may be introduced and used instead.

/**
 * @package   mod_data
 * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class data_field_base {     // Base class for Database Field Types (see field/*/field.class.php)

    /** @var string Subclasses must override the type with their name */
    var $type = 'unknown';
    /** @var object The database object that this field belongs to */
    var $data = NULL;
    /** @var object The field object itself, if we know it */
    var $field = NULL;
    /** @var int Width of the icon for this fieldtype */
    var $iconwidth = 16;
    /** @var int Width of the icon for this fieldtype */
    var $iconheight = 16;
    /** @var object course module or cmifno */
    var $cm;
    /** @var object activity context */
    var $context;
    /** @var priority for globalsearch indexing */
    protected static $priority = self::NO_PRIORITY;
    /** priority value for invalid fields regarding indexing */
    const NO_PRIORITY = 0;
    /** priority value for minimum priority */
    const MIN_PRIORITY = 1;
    /** priority value for low priority */
    const LOW_PRIORITY = 2;
    /** priority value for high priority */
    const HIGH_PRIORITY = 3;
    /** priority value for maximum priority */
    const MAX_PRIORITY = 4;

    /**
     * Constructor function
     *
     * @global object
     * @uses CONTEXT_MODULE
     * @param int $field
     * @param int $data
     * @param int $cm
     */
    function __construct($field=0, $data=0, $cm=0) {   // Field or data or both, each can be id or object
        global $DB;

        if (empty($field) && empty($data)) {
            print_error('missingfield', 'data');
        }

        if (!empty($field)) {
            if (is_object($field)) {
                $this->field = $field;  // Programmer knows what they are doing, we hope
            } else if (!$this->field = $DB->get_record('data_fields', array('id'=>$field))) {
                print_error('invalidfieldid', 'data');
            }
            if (empty($data)) {
                if (!$this->data = $DB->get_record('data', array('id'=>$this->field->dataid))) {
                    print_error('invalidid', 'data');
                }
            }
        }

        if (empty($this->data)) {         // We need to define this properly
            if (!empty($data)) {
                if (is_object($data)) {
                    $this->data = $data;  // Programmer knows what they are doing, we hope
                } else if (!$this->data = $DB->get_record('data', array('id'=>$data))) {
                    print_error('invalidid', 'data');
                }
            } else {                      // No way to define it!
                print_error('missingdata', 'data');
            }
        }

        if ($cm) {
            $this->cm = $cm;
        } else {
            $this->cm = get_coursemodule_from_instance('data', $this->data->id);
        }

        if (empty($this->field)) {         // We need to define some default values
            $this->define_default_field();
        }

        $this->context = context_module::instance($this->cm->id);
    }


    /**
     * This field just sets up a default field object
     *
     * @return bool
     */
    function define_default_field() {
        global $OUTPUT;
        if (empty($this->data->id)) {
            echo $OUTPUT->notification('Programmer error: dataid not defined in field class');
        }
        $this->field = new stdClass();
        $this->field->id = 0;
        $this->field->dataid = $this->data->id;
        $this->field->type   = $this->type;
        $this->field->param1 = '';
        $this->field->param2 = '';
        $this->field->param3 = '';
        $this->field->name = '';
        $this->field->description = '';
        $this->field->required = false;

        return true;
    }

    /**
     * Set up the field object according to data in an object.  Now is the time to clean it!
     *
     * @return bool
     */
    function define_field($data) {
        $this->field->type        = $this->type;
        $this->field->dataid      = $this->data->id;

        $this->field->name        = trim($data->name);
        $this->field->description = trim($data->description);
        $this->field->required    = !empty($data->required) ? 1 : 0;

        if (isset($data->param1)) {
            $this->field->param1 = trim($data->param1);
        }
        if (isset($data->param2)) {
            $this->field->param2 = trim($data->param2);
        }
        if (isset($data->param3)) {
            $this->field->param3 = trim($data->param3);
        }
        if (isset($data->param4)) {
            $this->field->param4 = trim($data->param4);
        }
        if (isset($data->param5)) {
            $this->field->param5 = trim($data->param5);
        }

        return true;
    }

    /**
     * Insert a new field in the database
     * We assume the field object is already defined as $this->field
     *
     * @global object
     * @return bool
     */
    function insert_field() {
        global $DB, $OUTPUT;

        if (empty($this->field)) {
            echo $OUTPUT->notification('Programmer error: Field has not been defined yet!  See define_field()');
            return false;
        }

        $this->field->id = $DB->insert_record('data_fields',$this->field);

        // Trigger an event for creating this field.
        $event = \mod_data\event\field_created::create(array(
            'objectid' => $this->field->id,
            'context' => $this->context,
            'other' => array(
                'fieldname' => $this->field->name,
                'dataid' => $this->data->id
            )
        ));
        $event->trigger();

        return true;
    }


    /**
     * Update a field in the database
     *
     * @global object
     * @return bool
     */
    function update_field() {
        global $DB;

        $DB->update_record('data_fields', $this->field);

        // Trigger an event for updating this field.
        $event = \mod_data\event\field_updated::create(array(
            'objectid' => $this->field->id,
            'context' => $this->context,
            'other' => array(
                'fieldname' => $this->field->name,
                'dataid' => $this->data->id
            )
        ));
        $event->trigger();

        return true;
    }

    /**
     * Delete a field completely
     *
     * @global object
     * @return bool
     */
    function delete_field() {
        global $DB;

        if (!empty($this->field->id)) {
            // Get the field before we delete it.
            $field = $DB->get_record('data_fields', array('id' => $this->field->id));

            $this->delete_content();
            $DB->delete_records('data_fields', array('id'=>$this->field->id));

            // Trigger an event for deleting this field.
            $event = \mod_data\event\field_deleted::create(array(
                'objectid' => $this->field->id,
                'context' => $this->context,
                'other' => array(
                    'fieldname' => $this->field->name,
                    'dataid' => $this->data->id
                 )
            ));
            $event->add_record_snapshot('data_fields', $field);
            $event->trigger();
        }

        return true;
    }

    /**
     * Print the relevant form element in the ADD template for this field
     *
     * @global object
     * @param int $recordid
     * @return string
     */
    function display_add_field($recordid=0, $formdata=null) {
        global $DB, $OUTPUT;

        if ($formdata) {
            $fieldname = 'field_' . $this->field->id;
            $content = $formdata->$fieldname;
        } else if ($recordid) {
            $content = $DB->get_field('data_content', 'content', array('fieldid'=>$this->field->id, 'recordid'=>$recordid));
        } else {
            $content = '';
        }

        // beware get_field returns false for new, empty records MDL-18567
        if ($content===false) {
            $content='';
        }

        $str = '<div title="' . s($this->field->description) . '">';
        $str .= '<label for="field_'.$this->field->id.'"><span class="accesshide">'.$this->field->name.'</span>';
        if ($this->field->required) {
            $image = $OUTPUT->pix_icon('req', get_string('requiredelement', 'form'));
            $str .= html_writer::div($image, 'inline-req');
        }
        $str .= '</label><input class="basefieldinput form-control d-inline mod-data-input" ' .
                'type="text" name="field_' . $this->field->id . '" ' .
                'id="field_' . $this->field->id . '" value="' . s($content) . '" />';
        $str .= '</div>';

        return $str;
    }

    /**
     * Print the relevant form element to define the attributes for this field
     * viewable by teachers only.
     *
     * @global object
     * @global object
     * @return void Output is echo'd
     */
    function display_edit_field() {
        global $CFG, $DB, $OUTPUT;

        if (empty($this->field)) {   // No field has been defined yet, try and make one
            $this->define_default_field();
        }
        echo $OUTPUT->box_start('generalbox boxaligncenter boxwidthwide');

        echo '<form id="editfield" action="'.$CFG->wwwroot.'/mod/data/field.php" method="post">'."\n";
        echo '<input type="hidden" name="d" value="'.$this->data->id.'" />'."\n";
        if (empty($this->field->id)) {
            echo '<input type="hidden" name="mode" value="add" />'."\n";
            $savebutton = get_string('add');
        } else {
            echo '<input type="hidden" name="fid" value="'.$this->field->id.'" />'."\n";
            echo '<input type="hidden" name="mode" value="update" />'."\n";
            $savebutton = get_string('savechanges');
        }
        echo '<input type="hidden" name="type" value="'.$this->type.'" />'."\n";
        echo '<input name="sesskey" value="'.sesskey().'" type="hidden" />'."\n";

        echo $OUTPUT->heading($this->name(), 3);

        require_once($CFG->dirroot.'/mod/data/field/'.$this->type.'/mod.html');

        echo '<div class="mdl-align">';
        echo '<input type="submit" class="btn btn-primary" value="'.$savebutton.'" />'."\n";
        echo '<input type="submit" class="btn btn-secondary" name="cancel" value="'.get_string('cancel').'" />'."\n";
        echo '</div>';

        echo '</form>';

        echo $OUTPUT->box_end();
    }

    /**
     * Display the content of the field in browse mode
     *
     * @global object
     * @param int $recordid
     * @param object $template
     * @return bool|string
     */
    function display_browse_field($recordid, $template) {
        global $DB;

        if ($content = $DB->get_record('data_content', array('fieldid'=>$this->field->id, 'recordid'=>$recordid))) {
            if (isset($content->content)) {
                $options = new stdClass();
                if ($this->field->param1 == '1') {  // We are autolinking this field, so disable linking within us
                    //$content->content = '<span class="nolink">'.$content->content.'</span>';
                    //$content->content1 = FORMAT_HTML;
                    $options->filter=false;
                }
                $options->para = false;
                $str = format_text($content->content, $content->content1, $options);
            } else {
                $str = '';
            }
            return $str;
        }
        return false;
    }

    /**
     * Update the content of one data field in the data_content table
     * @global object
     * @param int $recordid
     * @param mixed $value
     * @param string $name
     * @return bool
     */
    function update_content($recordid, $value, $name=''){
        global $DB;

        $content = new stdClass();
        $content->fieldid = $this->field->id;
        $content->recordid = $recordid;
        $content->content = clean_param($value, PARAM_NOTAGS);

        if ($oldcontent = $DB->get_record('data_content', array('fieldid'=>$this->field->id, 'recordid'=>$recordid))) {
            $content->id = $oldcontent->id;
            return $DB->update_record('data_content', $content);
        } else {
            return $DB->insert_record('data_content', $content);
        }
    }

    /**
     * Delete all content associated with the field
     *
     * @global object
     * @param int $recordid
     * @return bool
     */
    function delete_content($recordid=0) {
        global $DB;

        if ($recordid) {
            $conditions = array('fieldid'=>$this->field->id, 'recordid'=>$recordid);
        } else {
            $conditions = array('fieldid'=>$this->field->id);
        }

        $rs = $DB->get_recordset('data_content', $conditions);
        if ($rs->valid()) {
            $fs = get_file_storage();
            foreach ($rs as $content) {
                $fs->delete_area_files($this->context->id, 'mod_data', 'content', $content->id);
            }
        }
        $rs->close();

        return $DB->delete_records('data_content', $conditions);
    }

    /**
     * Check if a field from an add form is empty
     *
     * @param mixed $value
     * @param mixed $name
     * @return bool
     */
    function notemptyfield($value, $name) {
        return !empty($value);
    }

    /**
     * Just in case a field needs to print something before the whole form
     */
    function print_before_form() {
    }

    /**
     * Just in case a field needs to print something after the whole form
     */
    function print_after_form() {
    }


    /**
     * Returns the sortable field for the content. By default, it's just content
     * but for some plugins, it could be content 1 - content4
     *
     * @return string
     */
    function get_sort_field() {
        return 'content';
    }

    /**
     * Returns the SQL needed to refer to the column.  Some fields may need to CAST() etc.
     *
     * @param string $fieldname
     * @return string $fieldname
     */
    function get_sort_sql($fieldname) {
        return $fieldname;
    }

    /**
     * Returns the name/type of the field
     *
     * @return string
     */
    function name() {
        return get_string('fieldtypelabel', "datafield_$this->type");
    }

    /**
     * Prints the respective type icon
     *
     * @global object
     * @return string
     */
    function image() {
        global $OUTPUT;

        $params = array('d'=>$this->data->id, 'fid'=>$this->field->id, 'mode'=>'display', 'sesskey'=>sesskey());
        $link = new moodle_url('/mod/data/field.php', $params);
        $str = '<a href="'.$link->out().'">';
        $str .= $OUTPUT->pix_icon('field/' . $this->type, $this->type, 'data');
        $str .= '</a>';
        return $str;
    }

    /**
     * Per default, it is assumed that fields support text exporting.
     * Override this (return false) on fields not supporting text exporting.
     *
     * @return bool true
     */
    function text_export_supported() {
        return true;
    }

    /**
     * Per default, return the record's text value only from the "content" field.
     * Override this in fields class if necesarry.
     *
     * @param string $record
     * @return string
     */
    function export_text_value($record) {
        if ($this->text_export_supported()) {
            return $record->content;
        }
    }

    /**
     * @param string $relativepath
     * @return bool false
     */
    function file_ok($relativepath) {
        return false;
    }

    /**
     * Returns the priority for being indexed by globalsearch
     *
     * @return int
     */
    public static function get_priority() {
        return static::$priority;
    }

    /**
     * Returns the presentable string value for a field content.
     *
     * The returned string should be plain text.
     *
     * @param stdClass $content
     * @return string
     */
    public static function get_content_value($content) {
        return trim($content->content, "\r\n ");
    }

    /**
     * Return the plugin configs for external functions,
     * in some cases the configs will need formatting or be returned only if the current user has some capabilities enabled.
     *
     * @return array the list of config parameters
     * @since Moodle 3.3
     */
    public function get_config_for_external() {
        // Return all the field configs to null (maybe there is a private key for a service or something similar there).
        $configs = [];
        for ($i = 1; $i <= 10; $i++) {
            $configs["param$i"] = null;
        }
        return $configs;
    }
}


/**
 * Given a template and a dataid, generate a default case template
 *
 * @global object
 * @param object $data
 * @param string template [addtemplate, singletemplate, listtempalte, rsstemplate]
 * @param int $recordid
 * @param bool $form
 * @param bool $update
 * @return bool|string
 */
function data_generate_default_template(&$data, $template, $recordid=0, $form=false, $update=true) {
    global $DB;

    if (!$data && !$template) {
        return false;
    }
    if ($template == 'csstemplate' or $template == 'jstemplate' ) {
        return '';
    }

    // get all the fields for that database
    if ($fields = $DB->get_records('data_fields', array('dataid'=>$data->id), 'id')) {

        $table = new html_table();
        $table->attributes['class'] = 'mod-data-default-template ##approvalstatusclass##';
        $table->colclasses = array('template-field', 'template-token');
        $table->data = array();
        foreach ($fields as $field) {
            if ($form) {   // Print forms instead of data
                $fieldobj = data_get_field($field, $data);
                $token = $fieldobj->display_add_field($recordid, null);
            } else {           // Just print the tag
                $token = '[['.$field->name.']]';
            }
            $table->data[] = array(
                $field->name.': ',
                $token
            );
        }

        if (core_tag_tag::is_enabled('mod_data', 'data_records')) {
            $label = new html_table_cell(get_string('tags') . ':');
            if ($form) {
                $cell = data_generate_tag_form();
            } else {
                $cell = new html_table_cell('##tags##');
            }
            $table->data[] = new html_table_row(array($label, $cell));
        }

        if ($template == 'listtemplate') {
            $cell = new html_table_cell('##edit##  ##more##  ##delete##  ##approve##  ##disapprove##  ##export##');
            $cell->colspan = 2;
            $cell->attributes['class'] = 'controls';
            $table->data[] = new html_table_row(array($cell));
        } else if ($template == 'singletemplate') {
            $cell = new html_table_cell('##edit##  ##delete##  ##approve##  ##disapprove##  ##export##');
            $cell->colspan = 2;
            $cell->attributes['class'] = 'controls';
            $table->data[] = new html_table_row(array($cell));
        } else if ($template == 'asearchtemplate') {
            $row = new html_table_row(array(get_string('authorfirstname', 'data').': ', '##firstname##'));
            $row->attributes['class'] = 'searchcontrols';
            $table->data[] = $row;
            $row = new html_table_row(array(get_string('authorlastname', 'data').': ', '##lastname##'));
            $row->attributes['class'] = 'searchcontrols';
            $table->data[] = $row;
        }

        $str = '';
        if ($template == 'listtemplate'){
            $str .= '##delcheck##';
            $str .= html_writer::empty_tag('br');
        }

        $str .= html_writer::start_tag('div', array('class' => 'defaulttemplate'));
        $str .= html_writer::table($table);
        $str .= html_writer::end_tag('div');
        if ($template == 'listtemplate'){
            $str .= html_writer::empty_tag('hr');
        }

        if ($update) {
            $newdata = new stdClass();
            $newdata->id = $data->id;
            $newdata->{$template} = $str;
            $DB->update_record('data', $newdata);
            $data->{$template} = $str;
        }

        return $str;
    }
}

/**
 * Build the form elements to manage tags for a record.
 *
 * @param int|bool $recordid
 * @param string[] $selected raw tag names
 * @return string
 */
function data_generate_tag_form($recordid = false, $selected = []) {
    global $CFG, $DB, $OUTPUT, $PAGE;

    $tagtypestoshow = \core_tag_area::get_showstandard('mod_data', 'data_records');
    $showstandard = ($tagtypestoshow != core_tag_tag::HIDE_STANDARD);
    $typenewtags = ($tagtypestoshow != core_tag_tag::STANDARD_ONLY);

    $str = html_writer::start_tag('div', array('class' => 'datatagcontrol'));

    $namefield = empty($CFG->keeptagnamecase) ? 'name' : 'rawname';

    $tagcollid = \core_tag_area::get_collection('mod_data', 'data_records');
    $tags = [];
    $selectedtags = [];

    if ($showstandard) {
        $tags += $DB->get_records_menu('tag', array('isstandard' => 1, 'tagcollid' => $tagcollid),
            $namefield, 'id,' . $namefield . ' as fieldname');
    }

    if ($recordid) {
        $selectedtags += core_tag_tag::get_item_tags_array('mod_data', 'data_records', $recordid);
    }

    if (!empty($selected)) {
        list($sql, $params) = $DB->get_in_or_equal($selected, SQL_PARAMS_NAMED);
        $params['tagcollid'] = $tagcollid;
        $sql = "SELECT id, $namefield FROM {tag} WHERE tagcollid = :tagcollid AND rawname $sql";
        $selectedtags += $DB->get_records_sql_menu($sql, $params);
    }

    $tags += $selectedtags;

    $str .= '<select class="custom-select" name="tags[]" id="tags" multiple>';
    foreach ($tags as $tagid => $tag) {
        $selected = key_exists($tagid, $selectedtags) ? 'selected' : '';
        $str .= "<option value='$tag' $selected>$tag</option>";
    }
    $str .= '</select>';

    if (has_capability('moodle/tag:manage', context_system::instance()) && $showstandard) {
        $url = new moodle_url('/tag/manage.php', array('tc' => core_tag_area::get_collection('mod_data',
            'data_records')));
        $str .= ' ' . $OUTPUT->action_link($url, get_string('managestandardtags', 'tag'));
    }

    $PAGE->requires->js_call_amd('core/form-autocomplete', 'enhance', $params = array(
            '#tags',
            $typenewtags,
            '',
            get_string('entertags', 'tag'),
            false,
            $showstandard,
            get_string('noselection', 'form')
        )
    );

    $str .= html_writer::end_tag('div');

    return $str;
}


/**
 * Search for a field name and replaces it with another one in all the
 * form templates. Set $newfieldname as '' if you want to delete the
 * field from the form.
 *
 * @global object
 * @param object $data
 * @param string $searchfieldname
 * @param string $newfieldname
 * @return bool
 */
function data_replace_field_in_templates($data, $searchfieldname, $newfieldname) {
    global $DB;

    if (!empty($newfieldname)) {
        $prestring = '[[';
        $poststring = ']]';
        $idpart = '#id';

    } else {
        $prestring = '';
        $poststring = '';
        $idpart = '';
    }

    $newdata = new stdClass();
    $newdata->id = $data->id;
    $newdata->singletemplate = str_ireplace('[['.$searchfieldname.']]',
            $prestring.$newfieldname.$poststring, $data->singletemplate);

    $newdata->listtemplate = str_ireplace('[['.$searchfieldname.']]',
            $prestring.$newfieldname.$poststring, $data->listtemplate);

    $newdata->addtemplate = str_ireplace('[['.$searchfieldname.']]',
            $prestring.$newfieldname.$poststring, $data->addtemplate);

    $newdata->addtemplate = str_ireplace('[['.$searchfieldname.'#id]]',
            $prestring.$newfieldname.$idpart.$poststring, $data->addtemplate);

    $newdata->rsstemplate = str_ireplace('[['.$searchfieldname.']]',
            $prestring.$newfieldname.$poststring, $data->rsstemplate);

    return $DB->update_record('data', $newdata);
}


/**
 * Appends a new field at the end of the form template.
 *
 * @global object
 * @param object $data
 * @param string $newfieldname
 */
function data_append_new_field_to_templates($data, $newfieldname) {
    global $DB;

    $newdata = new stdClass();
    $newdata->id = $data->id;
    $change = false;

    if (!empty($data->singletemplate)) {
        $newdata->singletemplate = $data->singletemplate.' [[' . $newfieldname .']]';
        $change = true;
    }
    if (!empty($data->addtemplate)) {
        $newdata->addtemplate = $data->addtemplate.' [[' . $newfieldname . ']]';
        $change = true;
    }
    if (!empty($data->rsstemplate)) {
        $newdata->rsstemplate = $data->singletemplate.' [[' . $newfieldname . ']]';
        $change = true;
    }
    if ($change) {
        $DB->update_record('data', $newdata);
    }
}


/**
 * given a field name
 * this function creates an instance of the particular subfield class
 *
 * @global object
 * @param string $name
 * @param object $data
 * @return object|bool
 */
function data_get_field_from_name($name, $data){
    global $DB;

    $field = $DB->get_record('data_fields', array('name'=>$name, 'dataid'=>$data->id));

    if ($field) {
        return data_get_field($field, $data);
    } else {
        return false;
    }
}

/**
 * given a field id
 * this function creates an instance of the particular subfield class
 *
 * @global object
 * @param int $fieldid
 * @param object $data
 * @return bool|object
 */
function data_get_field_from_id($fieldid, $data){
    global $DB;

    $field = $DB->get_record('data_fields', array('id'=>$fieldid, 'dataid'=>$data->id));

    if ($field) {
        return data_get_field($field, $data);
    } else {
        return false;
    }
}

/**
 * given a field id
 * this function creates an instance of the particular subfield class
 *
 * @global object
 * @param string $type
 * @param object $data
 * @return object
 */
function data_get_field_new($type, $data) {
    global $CFG;

    require_once($CFG->dirroot.'/mod/data/field/'.$type.'/field.class.php');
    $newfield = 'data_field_'.$type;
    $newfield = new $newfield(0, $data);
    return $newfield;
}

/**
 * returns a subclass field object given a record of the field, used to
 * invoke plugin methods
 * input: $param $field - record from db
 *
 * @global object
 * @param object $field
 * @param object $data
 * @param object $cm
 * @return object
 */
function data_get_field($field, $data, $cm=null) {
    global $CFG;

    if ($field) {
        require_once('field/'.$field->type.'/field.class.php');
        $newfield = 'data_field_'.$field->type;
        $newfield = new $newfield($field, $data, $cm);
        return $newfield;
    }
}


/**
 * Given record object (or id), returns true if the record belongs to the current user
 *
 * @global object
 * @global object
 * @param mixed $record record object or id
 * @return bool
 */
function data_isowner($record) {
    global $USER, $DB;

    if (!isloggedin()) { // perf shortcut
        return false;
    }

    if (!is_object($record)) {
        if (!$record = $DB->get_record('data_records', array('id'=>$record))) {
            return false;
        }
    }

    return ($record->userid == $USER->id);
}

/**
 * has a user reached the max number of entries?
 *
 * @param object $data
 * @return bool
 */
function data_atmaxentries($data){
    if (!$data->maxentries){
        return false;

    } else {
        return (data_numentries($data) >= $data->maxentries);
    }
}

/**
 * returns the number of entries already made by this user
 *
 * @global object
 * @global object
 * @param object $data
 * @return int
 */
function data_numentries($data, $userid=null) {
    global $USER, $DB;
    if ($userid === null) {
        $userid = $USER->id;
    }
    $sql = 'SELECT COUNT(*) FROM {data_records} WHERE dataid=? AND userid=?';
    return $DB->count_records_sql($sql, array($data->id, $userid));
}

/**
 * function that takes in a dataid and adds a record
 * this is used everytime an add template is submitted
 *
 * @global object
 * @global object
 * @param object $data
 * @param int $groupid
 * @param int $userid
 * @return bool
 */
function data_add_record($data, $groupid = 0, $userid = null) {
    global $USER, $DB;

    $cm = get_coursemodule_from_instance('data', $data->id);
    $context = context_module::instance($cm->id);

    $record = new stdClass();
    $record->userid = $userid ?? $USER->id;
    $record->dataid = $data->id;
    $record->groupid = $groupid;
    $record->timecreated = $record->timemodified = time();
    if (has_capability('mod/data:approve', $context)) {
        $record->approved = 1;
    } else {
        $record->approved = 0;
    }
    $record->id = $DB->insert_record('data_records', $record);

    // Trigger an event for creating this record.
    $event = \mod_data\event\record_created::create(array(
        'objectid' => $record->id,
        'context' => $context,
        'other' => array(
            'dataid' => $data->id
        )
    ));
    $event->trigger();

    $course = get_course($cm->course);
    data_update_completion_state($data, $course, $cm);

    return $record->id;
}

/**
 * check the multple existence any tag in a template
 *
 * check to see if there are 2 or more of the same tag being used.
 *
 * @global object
 * @param int $dataid,
 * @param string $template
 * @return bool
 */
function data_tags_check($dataid, $template) {
    global $DB, $OUTPUT;

    // first get all the possible tags
    $fields = $DB->get_records('data_fields', array('dataid'=>$dataid));
    // then we generate strings to replace
    $tagsok = true; // let's be optimistic
    foreach ($fields as $field){
        $pattern="/\[\[" . preg_quote($field->name, '/') . "\]\]/i";
        if (preg_match_all($pattern, $template, $dummy)>1){
            $tagsok = false;
            echo $OUTPUT->notification('[['.$field->name.']] - '.get_string('multipletags','data'));
        }
    }
    // else return true
    return $tagsok;
}

/**
 * Adds an instance of a data
 *
 * @param stdClass $data
 * @param mod_data_mod_form $mform
 * @return int intance id
 */
function data_add_instance($data, $mform = null) {
    global $DB, $CFG;
    require_once($CFG->dirroot.'/mod/data/locallib.php');

    if (empty($data->assessed)) {
        $data->assessed = 0;
    }

    if (empty($data->ratingtime) || empty($data->assessed)) {
        $data->assesstimestart  = 0;
        $data->assesstimefinish = 0;
    }

    $data->timemodified = time();

    $data->id = $DB->insert_record('data', $data);

    // Add calendar events if necessary.
    data_set_events($data);
    if (!empty($data->completionexpected)) {
        \core_completion\api::update_completion_date_event($data->coursemodule, 'data', $data->id, $data->completionexpected);
    }

    data_grade_item_update($data);

    return $data->id;
}

/**
 * updates an instance of a data
 *
 * @global object
 * @param object $data
 * @return bool
 */
function data_update_instance($data) {
    global $DB, $CFG;
    require_once($CFG->dirroot.'/mod/data/locallib.php');

    $data->timemodified = time();
    $data->id           = $data->instance;

    if (empty($data->assessed)) {
        $data->assessed = 0;
    }

    if (empty($data->ratingtime) or empty($data->assessed)) {
        $data->assesstimestart  = 0;
        $data->assesstimefinish = 0;
    }

    if (empty($data->notification)) {
        $data->notification = 0;
    }

    $DB->update_record('data', $data);

    // Add calendar events if necessary.
    data_set_events($data);
    $completionexpected = (!empty($data->completionexpected)) ? $data->completionexpected : null;
    \core_completion\api::update_completion_date_event($data->coursemodule, 'data', $data->id, $completionexpected);

    data_grade_item_update($data);

    return true;

}

/**
 * deletes an instance of a data
 *
 * @global object
 * @param int $id
 * @return bool
 */
function data_delete_instance($id) {    // takes the dataid
    global $DB, $CFG;

    if (!$data = $DB->get_record('data', array('id'=>$id))) {
        return false;
    }

    $cm = get_coursemodule_from_instance('data', $data->id);
    $context = context_module::instance($cm->id);

/// Delete all the associated information

    // files
    $fs = get_file_storage();
    $fs->delete_area_files($context->id, 'mod_data');

    // get all the records in this data
    $sql = "SELECT r.id
              FROM {data_records} r
             WHERE r.dataid = ?";

    $DB->delete_records_select('data_content', "recordid IN ($sql)", array($id));

    // delete all the records and fields
    $DB->delete_records('data_records', array('dataid'=>$id));
    $DB->delete_records('data_fields', array('dataid'=>$id));

    // Remove old calendar events.
    $events = $DB->get_records('event', array('modulename' => 'data', 'instance' => $id));
    foreach ($events as $event) {
        $event = calendar_event::load($event);
        $event->delete();
    }

    // cleanup gradebook
    data_grade_item_delete($data);

    // Delete the instance itself
    // We must delete the module record after we delete the grade item.
    $result = $DB->delete_records('data', array('id'=>$id));

    return $result;
}

/**
 * returns a summary of data activity of this user
 *
 * @global object
 * @param object $course
 * @param object $user
 * @param object $mod
 * @param object $data
 * @return object|null
 */
function data_user_outline($course, $user, $mod, $data) {
    global $DB, $CFG;
    require_once("$CFG->libdir/gradelib.php");

    $grades = grade_get_grades($course->id, 'mod', 'data', $data->id, $user->id);
    if (empty($grades->items[0]->grades)) {
        $grade = false;
    } else {
        $grade = reset($grades->items[0]->grades);
    }


    if ($countrecords = $DB->count_records('data_records', array('dataid'=>$data->id, 'userid'=>$user->id))) {
        $result = new stdClass();
        $result->info = get_string('numrecords', 'data', $countrecords);
        $lastrecord   = $DB->get_record_sql('SELECT id,timemodified FROM {data_records}
                                              WHERE dataid = ? AND userid = ?
                                           ORDER BY timemodified DESC', array($data->id, $user->id), true);
        $result->time = $lastrecord->timemodified;
        if ($grade) {
            if (!$grade->hidden || has_capability('moodle/grade:viewhidden', context_course::instance($course->id))) {
                $result->info .= ', ' . get_string('grade') . ': ' . $grade->str_long_grade;
            } else {
                $result->info = get_string('grade') . ': ' . get_string('hidden', 'grades');
            }
        }
        return $result;
    } else if ($grade) {
        $result = (object) [
            'time' => grade_get_date_for_user_grade($grade, $user),
        ];
        if (!$grade->hidden || has_capability('moodle/grade:viewhidden', context_course::instance($course->id))) {
            $result->info = get_string('grade') . ': ' . $grade->str_long_grade;
        } else {
            $result->info = get_string('grade') . ': ' . get_string('hidden', 'grades');
        }

        return $result;
    }
    return NULL;
}

/**
 * Prints all the records uploaded by this user
 *
 * @global object
 * @param object $course
 * @param object $user
 * @param object $mod
 * @param object $data
 */
function data_user_complete($course, $user, $mod, $data) {
    global $DB, $CFG, $OUTPUT;
    require_once("$CFG->libdir/gradelib.php");

    $grades = grade_get_grades($course->id, 'mod', 'data', $data->id, $user->id);
    if (!empty($grades->items[0]->grades)) {
        $grade = reset($grades->items[0]->grades);
        if (!$grade->hidden || has_capability('moodle/grade:viewhidden', context_course::instance($course->id))) {
            echo $OUTPUT->container(get_string('grade').': '.$grade->str_long_grade);
            if ($grade->str_feedback) {
                echo $OUTPUT->container(get_string('feedback').': '.$grade->str_feedback);
            }
        } else {
            echo $OUTPUT->container(get_string('grade') . ': ' . get_string('hidden', 'grades'));
        }
    }

    if ($records = $DB->get_records('data_records', array('dataid'=>$data->id,'userid'=>$user->id), 'timemodified DESC')) {
        data_print_template('singletemplate', $records, $data);
    }
}

/**
 * Return grade for given user or all users.
 *
 * @global object
 * @param object $data
 * @param int $userid optional user id, 0 means all users
 * @return array array of grades, false if none
 */
function data_get_user_grades($data, $userid=0) {
    global $CFG;

    require_once($CFG->dirroot.'/rating/lib.php');

    $ratingoptions = new stdClass;
    $ratingoptions->component = 'mod_data';
    $ratingoptions->ratingarea = 'entry';
    $ratingoptions->modulename = 'data';
    $ratingoptions->moduleid   = $data->id;

    $ratingoptions->userid = $userid;
    $ratingoptions->aggregationmethod = $data->assessed;
    $ratingoptions->scaleid = $data->scale;
    $ratingoptions->itemtable = 'data_records';
    $ratingoptions->itemtableusercolumn = 'userid';

    $rm = new rating_manager();
    return $rm->get_user_grades($ratingoptions);
}

/**
 * Update activity grades
 *
 * @category grade
 * @param object $data
 * @param int $userid specific user only, 0 means all
 * @param bool $nullifnone
 */
function data_update_grades($data, $userid=0, $nullifnone=true) {
    global $CFG, $DB;
    require_once($CFG->libdir.'/gradelib.php');

    if (!$data->assessed) {
        data_grade_item_update($data);

    } else if ($grades = data_get_user_grades($data, $userid)) {
        data_grade_item_update($data, $grades);

    } else if ($userid and $nullifnone) {
        $grade = new stdClass();
        $grade->userid   = $userid;
        $grade->rawgrade = NULL;
        data_grade_item_update($data, $grade);

    } else {
        data_grade_item_update($data);
    }
}

/**
 * Update/create grade item for given data
 *
 * @category grade
 * @param stdClass $data A database instance with extra cmidnumber property
 * @param mixed $grades Optional array/object of grade(s); 'reset' means reset grades in gradebook
 * @return object grade_item
 */
function data_grade_item_update($data, $grades=NULL) {
    global $CFG;
    require_once($CFG->libdir.'/gradelib.php');

    $params = array('itemname'=>$data->name, 'idnumber'=>$data->cmidnumber);

    if (!$data->assessed or $data->scale == 0) {
        $params['gradetype'] = GRADE_TYPE_NONE;

    } else if ($data->scale > 0) {
        $params['gradetype'] = GRADE_TYPE_VALUE;
        $params['grademax']  = $data->scale;
        $params['grademin']  = 0;

    } else if ($data->scale < 0) {
        $params['gradetype'] = GRADE_TYPE_SCALE;
        $params['scaleid']   = -$data->scale;
    }

    if ($grades  === 'reset') {
        $params['reset'] = true;
        $grades = NULL;
    }

    return grade_update('mod/data', $data->course, 'mod', 'data', $data->id, 0, $grades, $params);
}

/**
 * Delete grade item for given data
 *
 * @category grade
 * @param object $data object
 * @return object grade_item
 */
function data_grade_item_delete($data) {
    global $CFG;
    require_once($CFG->libdir.'/gradelib.php');

    return grade_update('mod/data', $data->course, 'mod', 'data', $data->id, 0, NULL, array('deleted'=>1));
}

// junk functions
/**
 * takes a list of records, the current data, a search string,
 * and mode to display prints the translated template
 *
 * @global object
 * @global object
 * @param string $template
 * @param array $records
 * @param object $data
 * @param string $search
 * @param int $page
 * @param bool $return
 * @param object $jumpurl a moodle_url by which to jump back to the record list (can be null)
 * @return mixed
 */
function data_print_template($template, $records, $data, $search='', $page=0, $return=false, moodle_url $jumpurl=null) {
    global $CFG, $DB, $OUTPUT;

    $cm = get_coursemodule_from_instance('data', $data->id);
    $context = context_module::instance($cm->id);

    static $fields = array();
    static $dataid = null;

    if (empty($dataid)) {
        $dataid = $data->id;
    } else if ($dataid != $data->id) {
        $fields = array();
    }

    if (empty($fields)) {
        $fieldrecords = $DB->get_records('data_fields', array('dataid'=>$data->id));
        foreach ($fieldrecords as $fieldrecord) {
            $fields[]= data_get_field($fieldrecord, $data);
        }
    }

    if (empty($records)) {
        return;
    }

    if (!$jumpurl) {
        $jumpurl = new moodle_url('/mod/data/view.php', array('d' => $data->id));
    }
    $jumpurl = new moodle_url($jumpurl, array('page' => $page, 'sesskey' => sesskey()));

    foreach ($records as $record) {   // Might be just one for the single template

    // Replacing tags
        $patterns = array();
        $replacement = array();

    // Then we generate strings to replace for normal tags
        foreach ($fields as $field) {
            $patterns[]='[['.$field->field->name.']]';
            $replacement[] = highlight($search, $field->display_browse_field($record->id, $template));
        }

        $canmanageentries = has_capability('mod/data:manageentries', $context);

    // Replacing special tags (##Edit##, ##Delete##, ##More##)
        $patterns[]='##edit##';
        $patterns[]='##delete##';
        if (data_user_can_manage_entry($record, $data, $context)) {
            $replacement[] = '<a href="'.$CFG->wwwroot.'/mod/data/edit.php?d='
                             .$data->id.'&amp;rid='.$record->id.'&amp;sesskey='.sesskey().'">' .
                             $OUTPUT->pix_icon('t/edit', get_string('edit')) . '</a>';
            $replacement[] = '<a href="'.$CFG->wwwroot.'/mod/data/view.php?d='
                             .$data->id.'&amp;delete='.$record->id.'&amp;sesskey='.sesskey().'">' .
                             $OUTPUT->pix_icon('t/delete', get_string('delete')) . '</a>';
        } else {
            $replacement[] = '';
            $replacement[] = '';
        }

        $moreurl = $CFG->wwwroot . '/mod/data/view.php?d=' . $data->id . '&amp;rid=' . $record->id;
        if ($search) {
            $moreurl .= '&amp;filter=1';
        }
        $patterns[]='##more##';
        $replacement[] = '<a href="'.$moreurl.'">' . $OUTPUT->pix_icon('t/preview', get_string('more', 'data')) . '</a>';

        $patterns[]='##moreurl##';
        $replacement[] = $moreurl;

        $patterns[]='##delcheck##';
        if ($canmanageentries) {
            $checkbox = new \core\output\checkbox_toggleall('listview-entries', false, [
                'id' => "entry_{$record->id}",
                'name' => 'delcheck[]',
                'classes' => 'recordcheckbox',
                'value' => $record->id,
            ]);
            $replacement[] = $OUTPUT->render($checkbox);
        } else {
            $replacement[] = '';
        }

        $patterns[]='##user##';
        $replacement[] = '<a href="'.$CFG->wwwroot.'/user/view.php?id='.$record->userid.
                               '&amp;course='.$data->course.'">'.fullname($record).'</a>';

        $patterns[] = '##userpicture##';
        $ruser = user_picture::unalias($record, null, 'userid');
        // If the record didn't come with user data, retrieve the user from database.
        if (!isset($ruser->picture)) {
            $ruser = core_user::get_user($record->userid);
        }
        $replacement[] = $OUTPUT->user_picture($ruser, array('courseid' => $data->course));

        $patterns[]='##export##';

        if (!empty($CFG->enableportfolios) && ($template == 'singletemplate' || $template == 'listtemplate')
            && ((has_capability('mod/data:exportentry', $context)
                || (data_isowner($record->id) && has_capability('mod/data:exportownentry', $context))))) {
            require_once($CFG->libdir . '/portfoliolib.php');
            $button = new portfolio_add_button();
            $button->set_callback_options('data_portfolio_caller', array('id' => $cm->id, 'recordid' => $record->id), 'mod_data');
            list($formats, $files) = data_portfolio_caller::formats($fields, $record);
            $button->set_formats($formats);
            $replacement[] = $button->to_html(PORTFOLIO_ADD_ICON_LINK);
        } else {
            $replacement[] = '';
        }

        $patterns[] = '##timeadded##';
        $replacement[] = userdate($record->timecreated);

        $patterns[] = '##timemodified##';
        $replacement [] = userdate($record->timemodified);

        $patterns[]='##approve##';
        if (has_capability('mod/data:approve', $context) && ($data->approval) && (!$record->approved)) {
            $approveurl = new moodle_url($jumpurl, array('approve' => $record->id));
            $approveicon = new pix_icon('t/approve', get_string('approve', 'data'), '', array('class' => 'iconsmall'));
            $replacement[] = html_writer::tag('span', $OUTPUT->action_icon($approveurl, $approveicon),
                    array('class' => 'approve'));
        } else {
            $replacement[] = '';
        }

        $patterns[]='##disapprove##';
        if (has_capability('mod/data:approve', $context) && ($data->approval) && ($record->approved)) {
            $disapproveurl = new moodle_url($jumpurl, array('disapprove' => $record->id));
            $disapproveicon = new pix_icon('t/block', get_string('disapprove', 'data'), '', array('class' => 'iconsmall'));
            $replacement[] = html_writer::tag('span', $OUTPUT->action_icon($disapproveurl, $disapproveicon),
                    array('class' => 'disapprove'));
        } else {
            $replacement[] = '';
        }

        $patterns[] = '##approvalstatus##';
        $patterns[] = '##approvalstatusclass##';
        if (!$data->approval) {
            $replacement[] = '';
            $replacement[] = '';
        } else if ($record->approved) {
            $replacement[] = get_string('approved', 'data');
            $replacement[] = 'approved';
        } else {
            $replacement[] = get_string('notapproved', 'data');
            $replacement[] = 'notapproved';
        }

        $patterns[]='##comments##';
        if (($template == 'listtemplate') && ($data->comments)) {

            if (!empty($CFG->usecomments)) {
                require_once($CFG->dirroot  . '/comment/lib.php');
                list($context, $course, $cm) = get_context_info_array($context->id);
                $cmt = new stdClass();
                $cmt->context = $context;
                $cmt->course  = $course;
                $cmt->cm      = $cm;
                $cmt->area    = 'database_entry';
                $cmt->itemid  = $record->id;
                $cmt->showcount = true;
                $cmt->component = 'mod_data';
                $comment = new comment($cmt);
                $replacement[] = $comment->output(true);
            }
        } else {
            $replacement[] = '';
        }

        if (core_tag_tag::is_enabled('mod_data', 'data_records')) {
            $patterns[] = "##tags##";
            $replacement[] = $OUTPUT->tag_list(
                core_tag_tag::get_item_tags('mod_data', 'data_records', $record->id), '', 'data-tags');
        }

        // actual replacement of the tags
        $newtext = str_ireplace($patterns, $replacement, $data->{$template});

        // no more html formatting and filtering - see MDL-6635
        if ($return) {
            return $newtext;
        } else {
            echo $newtext;

            // hack alert - return is always false in singletemplate anyway ;-)
            /**********************************
             *    Printing Ratings Form       *
             *********************************/
            if ($template == 'singletemplate') {    //prints ratings options
                data_print_ratings($data, $record);
            }

            /**********************************
             *    Printing Comments Form       *
             *********************************/
            if (($template == 'singletemplate') && ($data->comments)) {
     …