<?php
Class Likes {
	private $user_obj;
	private $conn;
	public function __construct($conn, $user){
		$this->conn = $conn;
		$this->user_obj = NEW User($conn, $user);
	}


	public function addLikes($id_post, $id_user) {
		$id_post = $_POST['id_post'];
		$id_user = $_POST['id_user'];

		if(isset($_POST['likes'])) {
			$likeTotal = mysqli_query($conn, "SELECT * FROM likes where id_post='$id_post'");
			$likeTotalResult = mysqli_num_rows($likeTotal);

			$likeTotalPerUser = mysqli_query($conn, "SELECT * FROM likes WHERE id_user='$id_user' AND id_post='$id_post'");
			$likeTotalPerUserResult = mysqli_num_rows($likeTotalPerUser);
				if($likeTotalPerUserResult > 0) {
					exit();
				} else {
			mysqli_query($this->conn, "INSERT INTO likes (id_user, id_post, liked) VALUES ($id_user, $id_post, '1')");
			exit();
					}
						}
							}
	public function removeLikes($id_post, $id_user) {
		$id_post = $_POST['id_post'];
		$id_user = $_POST['id_user'];

		if(isset($_POST['unliked'])) {
			$result = mysqli_query($this->conn, "SELECT * FROM post where id_post=$id_post");
			$row = mysqli_fetch_array($result);
			$n = $row['likes'];

			$ifLikedCheck = mysqli_query($this->conn, "SELECT * FROM likes WHERE id_user=$id_user and id_post=$id_post");
				if($ifLikedCheck == 0) {
					exit();
				} else {
			mysqli_query($conn, "DELETE FROM likes WHERE id_user=$_SESSION[id_user] AND id_post=$_POST[id_post]");
			mysqli_query($conn, "UPDATE post SET likes=$n-1 WHERE id_post=$_POST[id_post]");
			}
		}

	}

	public function loadLikes($id_post, $id_user) {
		$id_post = $_POST['id_post'];
		$id_user = $_POST['id_user'];
		$likeEcho = "";

		$retrieveLikes = mysqli_query($this->conn, "SELECT * FROM likes WHERE id_post='$id_post'"); // Retrieves all likes for specific post.
		$totalLikes = mysqli_num_rows($retrieveLikes); // Query for displayable like count to be echo'd.
		$retrieveUser = mysqli_query($this->conn, "SELECT * FROM users WHERE id_user='$id_user'"); // Retrieves the specific user, liking post.
		$hasUserLiked = mysqli_query($this->conn, "SELECT * FROM likes WHERE id_user='$_SESSION[id_user]' AND id_post='$id_post'"); //Querying if the User has liked the post.



		if(mysqli_num_rows($retrieveLikes) > 0){

			echo $likeEcho = '<div class="post-additional-info inline-items">
								<a style="cursor:pointer" class="post-add-icon-active inline-items" id="' .$id_post. '" data-id="' .$id_post. '">
									<svg class="olymp-heart-icon">
										<use xlink:href="svg-icons/sprites/icons.svg#olymp-heart-icon"></use>
											</svg>
											<span class="likes_count" id="' .$id_post. '">' .$totalLikes. '</span>
											</a>';

									} else {

			echo $likeEcho = '<div class="post-additional-info inline-items">
								<a style="cursor:pointer" class="post-add-icon inline-items" id="' .$id_post. '" data-id="' .$id_post. '">
									<svg class="olymp-heart-icon">
										<use xlink:href="svg-icons/sprites/icons.svg#olymp-heart-icon" id="addLike" data-id="' .$id_post. '"></use>
										<span class="likes_count" id="' .$id_post. '">' .$totalLikes. '</span>
										</a>';

								 	}
								}

	public function loadLikerPictureArray($id_post, $id_user) {
		//Displaying Liker's Profile Image and First Name (Picture Array)
		$id_post = $_POST['id_post'];
		$id_user = $_POST['id_user'];
		$arrayLiker = mysqli_query($this->conn, "SELECT * FROM users WHERE id_user IN (SELECT id_user FROM likes WHERE id_post='$id_post')");
		$arrayLikerResult = mysqli_num_rows($arrayLiker);
		$likerId = $likerFirstName = $likerPic = array();
		$l = 0;
			echo '<ul class="friends-harmonic">';
				while ($likerRow = $likerResult->fetch_assoc()) {
					$likerId[] = $likerRow['id_user'];
					$likerFirstName[] = $likerRow['firstName'];
					$likerPic[] = $likerRow['profilePic'];
					$likerTotal = $totalLikes - 2;
				if ($totalLikes == 0) {
					$likerName = "";
				} else if ($totalLikes == 1) {
					$likerName = '<a href="profile.php?id='.$likerId[0].'">'.$likerFirstName[0].'</a> liked this.';
				} else if ($totalLikes == 2) {
					$likerName = '<a href="profile.php?id='.$likerId[0].'">'.$likerFirstName[0].'</a> & <a href="profile.php?id='.$likerId[1].'">'.$likerFirstName[1].'</a> liked this.';
				} else {
					$likerName = '<a href="profile.php?id='.$likerId[0].'">'.$likerFirstName[0].'</a>, <a href="profile.php?id='.$likerId[1].'">'.$likerFirstName[1].'</a> and <br>'.$likerTotal.' more liked this. ';
				}
                if($l >= 5){ continue; }
                	echo '<li>
                                <a href="profile.php?id='.$likerId[$l].'">
                                        <img src="'.$likerPic[$l].'" alt="'.$likerFirstName[$l].'">
                                    </a>
                            </li>';
                        $l++;
    			}
    				echo '</ul>';

        echo '<div class="names-people-likes">'.$likerName.'</div>';
			}

		}


 ?>