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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/>.

/**
 * Single insight view page.
 *
 * @package    report_insights
 * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace report_insights\output;

use core_analytics\prediction;

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

/**
     * @var \core_analytics\model
     */
    protected $model;

/**
     * @var \core_analytics\prediction
     */
    protected $prediction;

/**
     * @var bool
     */
    protected $includedetailsaction = false;

/**
     * @var \context
     */
    protected $context;

/**
     * Constructor
     *
     * @param \core_analytics\prediction $prediction
     * @param \core_analytics\model $model
     * @param bool $includedetailsaction
     * @param \context $context
     * @return void
     */
    public function __construct(\core_analytics\prediction $prediction, \core_analytics\model $model, $includedetailsaction,
            \context $context) {

$this->prediction = $prediction;
        $this->model = $model;
        $this->includedetailsaction = $includedetailsaction;
        $this->context = $context;
    }

/**
     * Exports the data.
     *
     * @param \renderer_base $output
     * @return \stdClass
     */
    public function export_for_template(\renderer_base $output) {
        // Get the prediction data.
        $predictiondata = $this->prediction->get_prediction_data();

$target = $this->model->get_target();

$data = new \stdClass();
        $data->modelid = $this->model->get_id();
        $data->contextid = $this->context->id;
        $data->predictionid = $predictiondata->id;

$targetname = $target->get_name();
        $data->insightname = format_string($targetname);

$targetinfostr = $targetname->get_identifier() . 'info';
        if (get_string_manager()->string_exists($targetinfostr, $targetname->get_component())) {
            $data->insightdescription = get_string($targetinfostr, $targetname->get_component());
        }

$data->showpredictionheading = true;
        if (!$target->is_linear()) {
            $nclasses = count($target::get_classes());
            $nignoredclasses = count($target->ignored_predicted_classes());
            if ($nclasses - $nignoredclasses <= 1) {
                // Hide the prediction heading if there is only 1 class displayed. Otherwise it is redundant with the insight name.
                $data->showpredictionheading = false;
            }
        }

// Get the details.
        $data->timecreated = userdate($predictiondata->timecreated);
        $data->timerange = '';

if (!empty($predictiondata->timestart) && !empty($predictiondata->timeend)) {
            $timerange = new \stdClass();
            $timerange->timestart = userdate($predictiondata->timestart);
            $timerange->timeend = userdate($predictiondata->timeend);
            $data->timerange = get_string('timerangewithdata', 'report_insights', $timerange);
        }

// Sample info (determined by the analyser).
        list($data->sampledescription, $samplerenderable) = $this->model->prediction_sample_description($this->prediction);

// Sampleimage is a renderable we should pass it to HTML.
        if ($samplerenderable) {
            $data->sampleimage = $output->render($samplerenderable);
        }

// Prediction info.
        $predictedvalue = $predictiondata->prediction;
        $data->predictiondisplayvalue = $target->get_display_value($predictedvalue);
        list($data->style, $data->outcomeicon) = self::get_calculation_display($target,
            floatval($predictedvalue), $output);

$data->actions = actions_exporter::add_prediction_actions($target, $output, $this->prediction,
            $this->includedetailsaction);
        $data->bulkactions = actions_exporter::add_bulk_actions($target, $output, [$this->prediction], $this->context);

// Calculated indicators values.
        $data->calculations = array();
        $calculations = $this->prediction->get_calculations();
        foreach ($calculations as $calculation) {

// Hook for indicators with extra features that should not be displayed (e.g. discrete indicators).
            if (!$calculation->indicator->should_be_displayed($calculation->value, $calculation->subtype)) {
                continue;
            }

if ($calculation->value === null) {
                // We don't show values that could not be calculated.
                continue;
            }

$obj = new \stdClass();
            $obj->name = call_user_func(array($calculation->indicator, 'get_name'));
            $obj->displayvalue = $calculation->indicator->get_display_value($calculation->value, $calculation->subtype);
            list($obj->style, $obj->outcomeicon) = self::get_calculation_display($calculation->indicator,
                floatval($calculation->value), $output, $calculation->subtype);

$identifier = $calculation->indicator->get_name()->get_identifier() . 'def';
            $component = $calculation->indicator->get_name()->get_component();
            if (get_string_manager()->string_exists($identifier, $component)) {
                $obj->outcomehelp = (new \help_icon($identifier, $component))->export_for_template($output);
            }
            $data->calculations[] = $obj;
        }

if (empty($data->calculations)) {
            $data->nocalculations = (object)array(
                'message' => get_string('nodetailsavailable', 'report_insights'),
                'closebutton' => false
            );
        }

// This is only rendered in report_insights/insight_details template for predictions with no action.
        // We need it to automatically enable the bulk action buttons in report/insights/prediction.php.
        $filtered = [
            \core_analytics\prediction::ACTION_FIXED,
            \core_analytics\prediction::ACTION_NOT_USEFUL,
            \core_analytics\prediction::ACTION_USEFUL,
            \core_analytics\prediction::ACTION_NOT_APPLICABLE,
            \core_analytics\prediction::ACTION_INCORRECTLY_FLAGGED,
        ];
        if (!$this->prediction->get_executed_actions($filtered)) {
            $toggleall = new \core\output\checkbox_toggleall('insight-bulk-action-' . $predictedvalue, true, [
                'id' => 'id-toggle-all-' . $predictedvalue,
                'name' => 'toggle-all-' . $predictedvalue,
                'classes' => 'hidden',
                'label' => get_string('selectall'),
                'labelclasses' => 'sr-only',
                'checked' => false,
            ]);
            $data->hiddencheckboxtoggleall = $output->render($toggleall);

$toggle = new \core\output\checkbox_toggleall('insight-bulk-action-' . $predictedvalue, false, [
                'id' => 'id-select-' . $data->predictionid,
                'name' => 'select-' . $data->predictionid,
                'label' => get_string('selectprediction', 'report_insights', $data->sampledescription),
                'labelclasses' => 'accesshide',
            ]);
            $data->toggleslave = $output->render($toggle);
        }

return $data;
    }

/**
     * Returns display info for the calculated value outcome.
     *
     * @param \core_analytics\calculable $calculable
     * @param float $value
     * @param \renderer_base $output
     * @param string|false $subtype
     * @return array The style as 'success', 'info', 'warning' or 'danger' and pix_icon
     */
    public static function get_calculation_display(\core_analytics\calculable $calculable, $value, $output, $subtype = false) {
        $outcome = $calculable->get_calculation_outcome($value, $subtype);
        switch ($outcome) {
            case \core_analytics\calculable::OUTCOME_NEUTRAL:
                $style = '';
                $text = get_string('outcomeneutral', 'report_insights');
                $icon = 't/check';
                break;
            case \core_analytics\calculable::OUTCOME_VERY_POSITIVE:
                $style = 'success';
                $text = get_string('outcomeverypositive', 'report_insights');
                $icon = 't/approve';
                break;
            case \core_analytics\calculable::OUTCOME_OK:
                $style = 'info';
                $text = get_string('outcomeok', 'report_insights');
                $icon = 't/check';
                break;
            case \core_analytics\calculable::OUTCOME_NEGATIVE:
                $style = 'warning';
                $text = get_string('outcomenegative', 'report_insights');
                $icon = 'i/warning';
                break;
            case \core_analytics\calculable::OUTCOME_VERY_NEGATIVE:
                $style = 'danger';
                $text = get_string('outcomeverynegative', 'report_insights');
                $icon = 'i/warning';
                break;
            default:
                throw new \coding_exception('The outcome returned by ' . get_class($calculable) . '::get_calculation_outcome is ' .
                    'not one of the accepted values. Please use \core_analytics\calculable::OUTCOME_VERY_POSITIVE, ' .
                    '\core_analytics\calculable::OUTCOME_OK, \core_analytics\calculable::OUTCOME_NEGATIVE, ' .
                    '\core_analytics\calculable::OUTCOME_VERY_NEGATIVE or \core_analytics\calculable::OUTCOME_NEUTRAL');
        }
        $icon = new \pix_icon($icon, $text);
        return array($style, $icon->export_for_template($output));
    }

/**
     * Model getter.
     *
     * @return \core_analytics\model
     */
    public function get_model(): \core_analytics\model {
        return $this->model;
    }
}

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