<?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/>.

/**
 * This is the external API for this component.
 *
 * @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;

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

require_once("$CFG->libdir/externallib.php");

use external_api;
use external_function_parameters;
use external_value;
use external_single_structure;
use external_warnings;

/**
 * This is the external API for this component.
 *
 * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class external extends external_api {

    /**
     * set_notuseful_prediction parameters.
     *
     * @return external_function_parameters
     * @since  Moodle 3.4
     */
    public static function set_notuseful_prediction_parameters() {
        return new external_function_parameters(
            array(
                'predictionid' => new external_value(PARAM_INT, 'The prediction id', VALUE_REQUIRED)
            )
        );
    }

    /**
     * Flags a prediction as fixed so no need to display it any more.
     *
     * @param int $predictionid
     * @return array an array of warnings and a boolean
     * @since  Moodle 3.4
     */
    public static function set_notuseful_prediction($predictionid) {

        $params = self::validate_parameters(self::set_notuseful_prediction_parameters(), array('predictionid' => $predictionid));

        list($model, $prediction, $context) = self::validate_prediction($params['predictionid']);

        $prediction->action_executed(\core_analytics\prediction::ACTION_NOT_USEFUL, $model->get_target());

        $success = true;
        return array('success' => $success, 'warnings' => array());
    }

    /**
     * set_notuseful_prediction return
     *
     * @return external_description
     * @since  Moodle 3.4
     */
    public static function set_notuseful_prediction_returns() {
        return new external_single_structure(
            array(
                'success' => new external_value(PARAM_BOOL, 'True if the prediction was successfully flagged as not useful.'),
                'warnings' => new external_warnings(),
            )
        );
    }

    /**
     * set_fixed_prediction parameters.
     *
     * @return external_function_parameters
     * @since  Moodle 3.4
     */
    public static function set_fixed_prediction_parameters() {
        return new external_function_parameters(
            array(
                'predictionid' => new external_value(PARAM_INT, 'The prediction id', VALUE_REQUIRED)
            )
        );
    }

    /**
     * Flags a prediction as fixed so no need to display it any more.
     *
     * @param int $predictionid
     * @return array an array of warnings and a boolean
     * @since  Moodle 3.4
     */
    public static function set_fixed_prediction($predictionid) {

        $params = self::validate_parameters(self::set_fixed_prediction_parameters(), array('predictionid' => $predictionid));

        list($model, $prediction, $context) = self::validate_prediction($params['predictionid']);

        $prediction->action_executed(\core_analytics\prediction::ACTION_FIXED, $model->get_target());

        $success = true;
        return array('success' => $success, 'warnings' => array());
    }

    /**
     * set_fixed_prediction return
     *
     * @return external_description
     * @since  Moodle 3.4
     */
    public static function set_fixed_prediction_returns() {
        return new external_single_structure(
            array(
                'success' => new external_value(PARAM_BOOL, 'True if the prediction was successfully flagged as fixed.'),
                'warnings' => new external_warnings(),
            )
        );
    }

    /**
     * Validates access to the prediction and returns it.
     *
     * @param int $predictionid
     * @return array array($model, $prediction, $context)
     */
    protected static function validate_prediction($predictionid) {

        list($model, $prediction, $context) = \core_analytics\manager::get_prediction($predictionid);

        self::validate_context($context);

        return array($model, $prediction, $context);
    }
}
