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Edit File: functions.php

<?php
/**
 * LearnPress Course Review Functions
 *
 * Define common functions for both front-end and back-end
 *
 * @author   ThimPress
 * @package  LearnPress/Course-Review/Functions
 * @version  3.0.2
 */

// Prevent loading this file directly
defined( 'ABSPATH' ) || exit;

/**
 * @param int $course_id
 * @param int $paged
 * @param int $per_page
 * @param boolean $force
 *
 * @tungnx: fix temporary, when have time will write, remove it.
 *
 * @return mixed
 */
function learn_press_get_course_review( $course_id, $paged = 1, $per_page = LP_ADDON_COURSE_REVIEW_PER_PAGE, $force = false ) {
	$results = array(
		'reviews'  => array(),
		'paged'    => $paged,
		'total'    => 0,
		'per_page' => $per_page,
	);

try {
		global $wpdb;
		$per_page = absint( apply_filters( 'learn_press_course_reviews_per_page', $per_page ) );
		$paged    = absint( $paged );

if ( $per_page == 0 ) {
			$per_page = 9999999;
		}

if ( $paged == 0 ) {
			$paged = 1;
		}

$start = ( $paged - 1 ) * $per_page;

$query = $wpdb->prepare(
			"
			SELECT SQL_CALC_FOUND_ROWS u.user_email, u.display_name, c.comment_ID as comment_id, cm1.meta_value as title, c.comment_content as content, cm2.meta_value as rate
			FROM {$wpdb->posts} p
			INNER JOIN {$wpdb->comments} c ON p.ID = c.comment_post_ID
			INNER JOIN {$wpdb->users} u ON u.ID = c.user_id
			INNER JOIN {$wpdb->commentmeta} cm1 ON cm1.comment_id = c.comment_ID AND cm1.meta_key = %s
			INNER JOIN {$wpdb->commentmeta} cm2 ON cm2.comment_id = c.comment_ID AND cm2.meta_key = %s
			WHERE p.ID = %d AND c.comment_type = %s AND c.comment_approved = %d
			ORDER BY c.comment_date DESC
			LIMIT %d, %d
			",
			'_lpr_review_title',
			'_lpr_rating',
			$course_id,
			'review',
			1,
			$start,
			$per_page
		);

$course_review = $wpdb->get_results( $query );

if ( $course_review ) {
			$ratings            = _learn_press_get_ratings( $course_id );
			$results['reviews'] = $course_review;
			$results['total']   = $ratings[ $course_id ]['total'];
			$results['pages']   = ceil( $results['total'] / $per_page );
		}
	} catch ( Throwable $e ) {

}

return $results;
}

function _learn_press_get_ratings( $course_id ) {
	$ratings = [
		$course_id => LP_Addon_Course_Review_Preload::$addon->get_rating_of_course( $course_id ),
	];

return $ratings;
}

/**
 * Get the rating info of a course
 *
 * @param $course_id
 * @param $field
 *
 * @return mixed
 */
function learn_press_get_course_rate( $course_id, $field = 'rated' ) {
	$ratings = _learn_press_get_ratings( $course_id );
	$rate    = ( $field && array_key_exists( $field, $ratings[ $course_id ] ) ) ? $ratings[ $course_id ][ $field ] : $ratings[ $course_id ];

return apply_filters( 'learn_press_get_course_rate', $rate );
}

function learn_press_get_course_rate_total( $course_id, $field = 'total' ) {
	$ratings = _learn_press_get_ratings( $course_id );

$total = $ratings[ $course_id ]['total'] ?? 0;

return apply_filters( 'learn_press_get_course_rate_total', $total );
}

/**
 * @param $course_id
 * @param $user_id
 *
 * @return string
 * @deprecated 4.1.2
 */
function learn_press_get_user_review_title( $course_id, $user_id ) {
	_deprecated_function( __FUNCTION__, '4.1.2' );
	return false;
	$course_review = get_post_meta( $course_id, '_lpr_course_review', true );

if ( $course_review && array_key_exists( $user_id, $course_review['review_title'] ) ) {
		return apply_filters( 'learn_press_get_user_review', $course_review['review_title'][ $user_id ] );
	}

return false;
}

/**
 * Get the rating user has posted for a course.
 *
 * @param int $course_id
 * @param int $user_id
 * @param bool $force
 *
 * @return mixed
 */
function learn_press_get_user_rate( int $course_id = 0, int $user_id = 0, $force = false ) {
	if ( ! $user_id ) {
		$user_id = get_current_user_id();
	}
	if ( ! $course_id ) {
		$course_id = get_the_ID();
	}

global $wpdb;
	$query = $wpdb->prepare(
		"
		SELECT *
		FROM {$wpdb->posts} p
		INNER JOIN {$wpdb->comments} c ON c.comment_post_ID = p.ID
		WHERE c.comment_post_ID = %d
		AND c.user_id = %d
		AND c.comment_type = %s
		",
		$course_id,
		$user_id,
		'review'
	);

$comment = $wpdb->get_row( $query );
	if ( $comment ) {
		$comment->comment_title = get_comment_meta( $comment->comment_ID, '_lpr_review_title', true );
		$comment->rating        = get_comment_meta( $comment->comment_ID, '_lpr_rating', true );
	}

return $comment;
}

/**
 * Add new review for a course
 *
 * @param array
 *
 * @return int
 */
function learn_press_add_course_review( $args = array() ) {
	$args        = wp_parse_args(
		$args,
		array(
			'title'     => '',
			'content'   => '',
			'rate'      => '',
			'user_id'   => 0,
			'course_id' => 0,
			'force'     => 0,
		)
	);
	$user_id     = $args['user_id'];
	$course_id   = $args['course_id'];
	$user_review = learn_press_get_user_rate( $course_id, $user_id, $args['force'] );
	$comment_id  = 0;

if ( ! $user_review ) {
		$user       = get_user_by( 'id', $user_id );
		$comment_id = wp_new_comment(
			array(
				'comment_post_ID'      => $course_id,
				'comment_author'       => $user->display_name,
				'comment_author_email' => $user->user_email,
				'comment_author_url'   => '',
				'comment_content'      => $args['content'],
				'comment_parent'       => 0,
				'user_id'              => $user->ID,
				'comment_approved'     => 1,
				'comment_type'         => 'review', // let filter to not display it as comments
			),
			true
		);
	}
	if ( ! $comment_id instanceof WP_Error ) {
		add_comment_meta( $comment_id, '_lpr_rating', $args['rate'] );
		add_comment_meta( $comment_id, '_lpr_review_title', $args['title'] );

// Clear cache
		$lp_course_review_cache = new LP_Course_Review_Cache( true );
		$lp_course_review_cache->clean_rating( $course_id, $user_id );
	}

return $comment_id;
}

/**
 * @deprecated 4.0.6
 */
function learn_press_course_review_template( $name, $args = null ) {
	learn_press_get_template( $name, $args, learn_press_template_path() . '/addons/course-review/', LP_ADDON_COURSE_REVIEW_TMPL );
}

/*
 * If we are viewing archive course page, so load all ratings of courses
 * into cache to reduce queries and time rather than load separate course
 * in loop
 */
//add_filter( 'the_posts', 'learn_press_init_courses_review' );
function learn_press_init_courses_review( $posts ) {
	if ( $posts ) {
		$pIds = array();
		foreach ( $posts as $p ) {
			$pIds[] = $p->ID;
		}
		_learn_press_get_ratings( $pIds );
	}

return $posts;
}

/**
 * Get rating for a course
 *
 * @param int $course_id
 * @param bool $get_items
 *
 * @return array|string
 * @deprecated 4.1.2
 */
function leanr_press_get_ratings_result( $course_id = 0, $get_items = false ) {
	_deprecated_function( __FUNCTION__, '4.1.2' );
	return '';
	if ( get_post_type( $course_id ) !== LP_COURSE_CPT ) {
		return '';
	}

$result = wp_cache_get( 'course-' . $course_id, 'lp-course-ratings' );

if ( $result === false ) {
		global $wpdb;

$query = $wpdb->prepare(
			"
				SELECT
					cm.meta_value `rate`, COUNT(1) `count`
				FROM
					{$wpdb->comments} c
						INNER JOIN
					{$wpdb->commentmeta} cm ON c.comment_ID = cm.comment_id AND meta_key = %s
				WHERE
					c.comment_approved = 1
						AND c.comment_type = %s
						AND c.user_id > 0
						AND c.comment_post_ID = %d
				GROUP BY `cm`.`meta_value`
			",
			'_lpr_rating',
			'review',
			$course_id
		);
		$rows  = $wpdb->get_results( $query );

$count = 0;
		$rate  = 0;
		$avg   = 0;
		$items = array();

for ( $i = 5; $i > 0; $i-- ) {
			$items[ $i ] = array(
				'rated'   => $i,
				'total'   => 0,
				'percent' => 0,
			);
		}

if ( $rows ) {
			$count       = wp_list_pluck( $rows, 'count' );
			$count       = array_sum( $count );
			$round       = array();
			$one_hundred = 0;

foreach ( $rows as $row ) {
				$rate               += $row->rate * $row->count;
				$percent             = $row->count / $count * 100;
				$items[ $row->rate ] = array(
					'rated'         => $row->rate,
					'total'         => $row->count,
					'percent'       => floor( $percent ),
					'percent_float' => $percent,
				);
				$one_hundred        += $items[ $row->rate ]['percent'];
				$round[ $row->rate ] = $percent - floor( $percent );
			}

if ( $one_hundred < 100 ) {
				arsort( $round );
				foreach ( $round as $key => $value ) {
					$percent                  = $items[ $key ]['percent'];
					$items[ $key ]['percent'] = ceil( $items[ $key ]['percent_float'] );

if ( $percent < $items[ $key ]['percent'] ) {
						++$one_hundred;
						if ( $one_hundred == 100 ) {
							break;
						}
					}
				}
			}

$avg = $rate / $count;
		}

$result = array(
			'course_id' => $course_id,
			'total'     => $count,
			'rated'     => $avg,
			'items'     => $items,
		);

wp_cache_set( 'course-' . $course_id, $result, 'lp-course-ratings', 6 * HOUR_IN_SECONDS );
	}

return $result;
}

function learn_press_course_meta_primary_review() {
	if ( LP_COURSE_CPT !== get_post_type() ) {
		return;
	}

$course_rate_res = learn_press_get_course_rate( get_the_ID(), false );
	?>
	<div class="meta-item meta-item-review">
		<div class="meta-item__value">
			<label><?php esc_html_e( 'Review', 'learnpress-course-review' ); ?></label>
			<div>
				<?php
				LP_Addon_Course_Review_Preload::$addon->get_template(
					'rating-stars.php',
					array( 'rated' => $course_rate_res['rated'] )
				);
				?>
			</div>
		</div>
	</div>
	<?php
}

add_action( 'learn-press/course-meta-primary-left', 'learn_press_course_meta_primary_review', 30 );