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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Test target.
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 *
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 * @package   core_analytics
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 * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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defined('MOODLE_INTERNAL') || die();
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/**
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 * Test target.
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 *
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 * @package   core_analytics
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 * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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class test_target_shortname extends \core_analytics\local\target\binary {
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    /**
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     * Returns a lang_string object representing the name for the indicator.
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     *
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     * Used as column identificator.
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     *
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     * If there is a corresponding '_help' string this will be shown as well.
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     *
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     * @return \lang_string
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     */
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    public static function get_name(): \lang_string {
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        // Using a string that exists and contains a corresponding '_help' string.
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        return new \lang_string('allowstealthmodules');
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    }
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    /**
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     * predictions
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     *
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     * @var array
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     */
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    protected $predictions = array();
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    /**
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     * get_analyser_class
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     *
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     * @return string
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     */
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    public function get_analyser_class() {
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        return '\core\analytics\analyser\site_courses';
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    }
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    /**
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     * classes_description
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     *
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     * @return string[]
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     */
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    public static function classes_description() {
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        return array(
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            'Course fullname first char is A',
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            'Course fullname first char is not A'
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        );
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    }
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    /**
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     * We don't want to discard results.
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     * @return float
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     */
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    protected function min_prediction_score() {
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        return null;
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    }
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    /**
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     * We don't want to discard results.
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     * @return array
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     */
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    public function ignored_predicted_classes() {
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        return array();
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    }
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    /**
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     * Only past stuff.
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     *
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     * @param  \core_analytics\local\time_splitting\base $timesplitting
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     * @return bool
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     */
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    public function can_use_timesplitting(\core_analytics\local\time_splitting\base $timesplitting): bool {
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        return ($timesplitting instanceof \core_analytics\local\time_splitting\before_now);
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    }
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    /**
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     * is_valid_analysable
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     *
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     * @param \core_analytics\analysable $analysable
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     * @param bool $fortraining
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     * @return bool
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     */
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    public function is_valid_analysable(\core_analytics\analysable $analysable, $fortraining = true) {
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        // This is testing, let's make things easy.
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        return true;
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    }
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    /**
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     * is_valid_sample
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     *
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     * @param int $sampleid
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     * @param \core_analytics\analysable $analysable
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     * @param bool $fortraining
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     * @return bool
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     */
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    public function is_valid_sample($sampleid, \core_analytics\analysable $analysable, $fortraining = true) {
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        // We skip not-visible courses during training as a way to emulate the training data / prediction data difference.
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        // In normal circumstances is_valid_sample will return false when they receive a sample that can not be
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        // processed.
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        if (!$fortraining) {
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            return true;
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        }
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        $sample = $this->retrieve('course', $sampleid);
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        if ($sample->visible == 0) {
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            return false;
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        }
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        return true;
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    }
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    /**
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     * calculate_sample
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     *
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     * @param int $sampleid
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     * @param \core_analytics\analysable $analysable
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     * @param int $starttime
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     * @param int $endtime
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     * @return float
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     */
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    protected function calculate_sample($sampleid, \core_analytics\analysable $analysable, $starttime = false, $endtime = false) {
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        $sample = $this->retrieve('course', $sampleid);
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        $firstchar = substr($sample->shortname, 0, 1);
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        if ($firstchar === 'a') {
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            return 1;
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        } else {
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            return 0;
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        }
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    }
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}