<?php
///////////////////////////////////////////////////////////////////////////
//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.org                                            //
//                                                                       //
// Copyright (C) 1999-onwards Moodle Pty Ltd  http://moodle.com          //
//                                                                       //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program 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:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

class data_field_latlong extends data_field_base {
    var $type = 'latlong';

    // This is an array of URL schemes for linking out to services, using the float values of lat and long.
    // In each scheme, the special markers @lat@ and @long@ will be replaced by the float values.
    // The config options for the field store each service name that should be displayed, in a comma-separated
    // field. Therefore please DO NOT include commas in the service names if you are adding extra services.

    // Parameter data used:
    // "param1" is a comma-separated list of the linkout service names that are enabled for this instance
    // "param2" indicates the label that will be used in generating Google Earth KML files: -1 for item #, -2 for lat/long, positive number for the (text) field to use.

    var $linkoutservices = array(
          "Google Maps" => "http://maps.google.com/maps?q=@lat@,+@long@&iwloc=A&hl=en",
          "Google Earth" => "@wwwroot@/mod/data/field/latlong/kml.php?d=@dataid@&fieldid=@fieldid@&rid=@recordid@",
          "Geabios" => "http://www.geabios.com/html/services/maps/PublicMap.htm?lat=@lat@&lon=@long@&fov=0.3&title=Moodle%20data%20item",
          "OpenStreetMap" => "http://www.openstreetmap.org/index.html?lat=@lat@&lon=@long@&zoom=11",
          "Multimap" => "http://www.multimap.com/map/browse.cgi?scale=200000&lon=@long@&lat=@lat@&icon=x"
    );
    // Other map sources listed at http://kvaleberg.com/extensions/mapsources/index.php?params=51_30.4167_N_0_7.65_W_region:earth

    public function supports_preview(): bool {
        return true;
    }

    public function get_data_content_preview(int $recordid): stdClass {
        return (object)[
            'id' => 0,
            'fieldid' => $this->field->id,
            'recordid' => $recordid,
            'content' => 41.391205,
            'content1' => 2.163873,
            'content2' => null,
            'content3' => null,
            'content4' => null,
        ];
    }

    function display_add_field($recordid = 0, $formdata = null) {
        global $CFG, $DB, $OUTPUT;

        $lat = '';
        $long = '';
        if ($formdata) {
            $fieldname = 'field_' . $this->field->id . '_0';
            $lat = $formdata->$fieldname;
            $fieldname = 'field_' . $this->field->id . '_1';
            $long = $formdata->$fieldname;
        } else if ($recordid) {
            if ($content = $DB->get_record('data_content', array('fieldid'=>$this->field->id, 'recordid'=>$recordid))) {
                $lat  = $content->content;
                $long = $content->content1;
            }
        }
        $str = '<div title="'.s($this->field->description).'">';
        $str .= '<fieldset><legend><span class="accesshide">'.s($this->field->name).'</span></legend>';
        $str .= '<table class="d-flex flex-wrap align-items-center"><tr><td align="right">';
        $classes = 'mod-data-input form-control-static';
        $str .= '<label for="field_'.$this->field->id.'_0" class="' . $classes . '">' . get_string('latitude', 'data');
        if ($this->field->required) {
            $str .= $OUTPUT->pix_icon('req', get_string('requiredelement', 'form'));
        }
        $classes = 'form-control mx-1';
        $str .= '</label></td><td>';
        $str .= '<input class="' . $classes . '" type="text" name="field_'.$this->field->id.'_0" ';
        $str .= ' id="field_'.$this->field->id.'_0" value="';
        $str .= s($lat).'" size="10" />°N</td></tr>';
        $classes = 'mod-data-input form-control-static';
        $str .= '<tr><td align="right"><label for="field_'.$this->field->id.'_1" class="' . $classes . '">';
        $str .= get_string('longitude', 'data');
        if ($this->field->required) {
            $str .= $OUTPUT->pix_icon('req', get_string('requiredelement', 'form'));
        }
        $classes = 'form-control mx-1';
        $str .= '</label></td><td><input class="' . $classes . '" type="text" ';
        $str .= 'name="field_'.$this->field->id.'_1" id="field_'.$this->field->id.'_1" value="';
        $str .= s($long).'" size="10" />°E</td>';
        $str .= '</tr>';
        $str .= '</table>';
        $str .= '</fieldset>';
        $str .= '</div>';
        return $str;
    }

    function display_search_field($value = '') {
        global $CFG, $DB;

        $varcharlat = $DB->sql_compare_text('content');
        $varcharlong= $DB->sql_compare_text('content1');
        $latlongsrs = $DB->get_recordset_sql(
            "SELECT DISTINCT $varcharlat AS la, $varcharlong AS lo
               FROM {data_content}
              WHERE fieldid = ?
             ORDER BY $varcharlat, $varcharlong", array($this->field->id));

        $options = array();
        foreach ($latlongsrs as $latlong) {
            $latitude = format_float($latlong->la, 4);
            $longitude = format_float($latlong->lo, 4);
            if ($latitude && $longitude) {
                $options[$latlong->la . ',' . $latlong->lo] = $latitude . ' ' . $longitude;
            }
        }
        $latlongsrs->close();

        $classes = array('class' => 'accesshide');
        $return = html_writer::label(get_string('latlong', 'data'), 'menuf_'.$this->field->id, false, $classes);
        $classes = array('class' => 'custom-select');
        $return .= html_writer::select($options, 'f_'.$this->field->id, $value, array('' => get_string('menuchoose', 'data')),
            $classes);
       return $return;
    }

    public function parse_search_field($defaults = null) {
        $param = 'f_'.$this->field->id;
        if (empty($defaults[$param])) {
            $defaults = array($param => '');
        }
        return optional_param($param, $defaults[$param], PARAM_NOTAGS);
    }

    function generate_sql($tablealias, $value) {
        global $DB;

        static $i=0;
        $i++;
        $name1 = "df_latlong1_$i";
        $name2 = "df_latlong2_$i";
        $varcharlat = $DB->sql_compare_text("{$tablealias}.content");
        $varcharlong= $DB->sql_compare_text("{$tablealias}.content1");


        $latlong[0] = '';
        $latlong[1] = '';
        $latlong = explode (',', $value, 2);
        return array(" ({$tablealias}.fieldid = {$this->field->id} AND $varcharlat = :$name1 AND $varcharlong = :$name2) ",
                     array($name1=>$latlong[0], $name2=>$latlong[1]));
    }

    function display_browse_field($recordid, $template) {
        global $CFG;

        $content = $this->get_data_content($recordid);
        if (!$content) {
            return '';
        }

        $lat = $content->content;
        if (strlen($lat ?? '') < 1) {
            return '';
        }
        $long = $content->content1;
        if (strlen($long ?? '') < 1) {
            return '';
        }
        // We use format_float to display in the regional format.
        if ($lat < 0) {
            $compasslat = format_float(-$lat, 4) . '°S';
        } else {
            $compasslat = format_float($lat, 4) . '°N';
        }
        if ($long < 0) {
            $compasslong = format_float(-$long, 4) . '°W';
        } else {
            $compasslong = format_float($long, 4) . '°E';
        }

        // Now let's create the jump-to-services link.
        $servicesshown = explode(',', $this->field->param1);

        // These are the different things that can be magically inserted into URL schemes.
        $urlreplacements = array(
            '@lat@' => $lat,
            '@long@' => $long,
            '@wwwroot@' => $CFG->wwwroot,
            '@contentid@' => $content->id,
            '@dataid@' => $this->data->id,
            '@courseid@' => $this->data->course,
            '@fieldid@' => $content->fieldid,
            '@recordid@' => $content->recordid,
        );

        if (count($servicesshown) == 1 && $servicesshown[0]) {
            $str = " <a class=\"data-field-link\" href='"
                        . str_replace(
                            array_keys($urlreplacements),
                            array_values($urlreplacements),
                            $this->linkoutservices[$servicesshown[0]]
                        ) . "' title='$servicesshown[0]'>$compasslat $compasslong</a>";
        } else if (count($servicesshown) > 1) {
            $str = '<form id="latlongfieldbrowse" class="data-field-html">';
            $str .= "$compasslat, $compasslong\n";
            $str .= "<label class='accesshide' for='jumpto'>". get_string('jumpto') ."</label>";
            $str .= '<select id="jumpto" name="jumpto" class="custom-select">';
            foreach ($servicesshown as $servicename) {
                // Add a link to a service.
                $str .= "\n  <option value='"
                            . str_replace(
                                array_keys($urlreplacements),
                                array_values($urlreplacements),
                                $this->linkoutservices[$servicename]
                            ) . "'>".htmlspecialchars($servicename, ENT_COMPAT)."</option>";
            }
            // NB! If you are editing this, make sure you don't break the javascript reference "previousSibling"
            // which allows the "Go" button to refer to the drop-down selector.
            $str .= '\n</select><input type="button" class="btn ml-1 btn-secondary" value="' . get_string('go');
            $str .= '" onclick="if(previousSibling.value){self.location=previousSibling.value}"/>';
            $str .= '</form>';
        } else {
            $str = "$compasslat, $compasslong";
        }

        return $str;
    }

    function update_content_import($recordid, $value, $name='') {
        $values = explode(" ", $value, 2);

        foreach ($values as $index => $value) {
            $this->update_content($recordid, $value, $name . '_' . $index);
        }
    }

    function update_content($recordid, $value, $name='') {
        global $DB;

        $content = new stdClass();
        $content->fieldid = $this->field->id;
        $content->recordid = $recordid;
        // When updating these values (which might be region formatted) we should format
        // the float to allow for a consistent float format in the database.
        $value = unformat_float($value);
        $value = trim($value ?? '');
        if (strlen($value) > 0) {
            $value = floatval($value);
        } else {
            $value = null;
        }
        $names = explode('_', $name);
        switch ($names[2]) {
            case 0:
                // update lat
                $content->content = $value;
                break;
            case 1:
                // update long
                $content->content1 = $value;
                break;
            default:
                break;
        }
        if ($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);
        }
    }

    function get_sort_sql($fieldname) {
        global $DB;
        return $DB->sql_cast_char2real($fieldname, true);
    }

    function export_text_value($record) {
        // The content here is from the database and does not require location formating.
        return sprintf('%01.4f', $record->content) . ' ' . sprintf('%01.4f', $record->content1);
    }

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

    /**
     * Validate values for this field.
     * Both the Latitude and the Longitude fields need to be filled in.
     *
     * @param array $values The entered values for the lat. and long.
     * @return string|bool Error message or false.
     */
    public function field_validation($values) {
        $valuecount = 0;
        // The lat long class has two values that need to be checked.
        foreach ($values as $value) {
            if (isset($value->value) && !($value->value == '')) {
                $valuecount++;
            }
        }
        // If we have nothing filled in or both filled in then everything is okay.
        if ($valuecount == 0 || $valuecount == 2) {
            return false;
        }
        // If we get here then only one field has been filled in.
        return get_string('latlongboth', 'data');
    }

    /**
     * Return the plugin configs for external functions.
     *
     * @return array the list of config parameters
     * @since Moodle 3.3
     */
    public function get_config_for_external() {
        // Return all the config parameters.
        $configs = [];
        for ($i = 1; $i <= 10; $i++) {
            $configs["param$i"] = $this->field->{"param$i"};
        }
        return $configs;
    }

    public function get_field_params(): array {
        global $DB;

        $data = parent::get_field_params();
        $data['dataid'] = $this->data->id;

        if (isset($this->field->param1)) {
            $data["param1"] = $this->field->param1;
            if (isset($this->linkoutservices)) {
                $serviceschosen = explode(',', htmlspecialchars($this->field->param1));
                foreach ($this->linkoutservices as $servicename => $serviceurl) {
                    $servicename = htmlspecialchars($servicename);
                    $data['latlonglinkservices'][] = [
                        'name' => $servicename,
                        'selected' => in_array($servicename, $serviceschosen),
                    ];
                    unset($serviceschosen[$servicename]);
                }
                $data['latlonglinkservicessize'] = count($this->linkoutservices);
            }
        }

        $data["otherfields"][] = [
            'value' => -1,
            'name' => get_string('entry', 'data') . " #",
            'selected' => $this->field->param2 == -1,
        ];
        $data['otherfields'][] = [
            'value' => -2,
            'name' => get_string('latitude', 'data') . "/" . get_string('longitude', 'data'),
            'selected' => $this->field->param2 == -2,
        ];

        // Fetch all "suitable" other fields that exist for this database.
        $textfields = $DB->get_records('data_fields', ['dataid' => $this->data->id, 'type' => 'text']);
        if (count($textfields) > 0) {
            $data['otherfieldsoptgroups']['label'] = get_string('latlongotherfields', 'data') . ":";
            foreach ($textfields as $textfield) {
                $data['otherfieldsoptgroups']['options'][] = [
                    'value' => $textfield->id,
                    'name' => $textfield->name,
                    'selected' => $this->field->param2 == $textfield->id,
                ];
            }
        }
        if (isset($data['otherfieldsoptgroups'])) {
            $data['otherfields'][] = $data['otherfieldsoptgroups'];
        }
        if (isset($this->field->id)) {
            $data['fieldid'] = $this->field->id;
        }

        return $data;
    }
}