316 lines
13 KiB
PHP
316 lines
13 KiB
PHP
<?php
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require_once "lib/upload.php";
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require_once "lib/account.php";
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/**
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* Adds a meme to the database with associated image and text content.
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*
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* @param string $title The title of the meme.
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* @param string $memeText The text content of the meme.
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* @param int $imageID The ID of the image associated with the meme.
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* @return array Returns an associative array with the operation status and a message.
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* @global mysqli $mysqli The database connection object.
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*/
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function addMeme(string $title, string $memeText, int $imageID): array
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{
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global $mysqli;
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$output = ["Status" => "Fail"];
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if (isLoggedIn() && fileExists($imageID, false) && !empty($title) && !empty($memeText) && !empty($imageID) && $imageID > 0) {
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$stmtMemeAdd = $mysqli->prepare('INSERT INTO Memes (AuthorID, Title, TextContent, FileID) VALUES (?, ?, ?, ?)');
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$stmtMemeAdd->bind_param('issi', $_SESSION['ID'], htmlspecialchars($title), htmlspecialchars($memeText), $imageID);
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if ($stmtMemeAdd->execute() && $stmtMemeAdd->affected_rows > 0) {
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$output["Status"] = "Success";
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$output["Meme"] = "Funny";
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}
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}
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return $output;
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}
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function executeAndRenderMemes(mysqli_stmt $stmt): string {
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global $routerConfig;
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$stmt->execute();
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$stmt->store_result();
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$stmt->bind_result($memeID, $title, $textContent, $createdAt, $authorID, $filePath, $imageWidth, $imageHeight, $userNickname);
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$memes_out = '';
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$meme_template = file_get_contents($routerConfig['template_dir'] . "meme.html");
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$meme_gallery_template = file_get_contents($routerConfig['template_dir'] . 'meme_gallery.html');
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while ($stmt->fetch()) {
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$memes_out .= renderMeme($memeID, $authorID, $title, $textContent, $createdAt, $filePath, $imageWidth, $imageHeight, $userNickname, $meme_template);
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}
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$meme_add = isLoggedIn() ? file_get_contents($routerConfig['template_dir'] . 'meme_add.html') : '';
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$meme_gallery_out = str_replace('__TEMPLATE_MEMES_HERE__', $memes_out, $meme_gallery_template);
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$meme_gallery_out = str_replace('__TEMPLATE_MEME_ADD__', $meme_add, $meme_gallery_out);
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$stmt->close();
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return $meme_gallery_out;
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}
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/**
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* Renders a meme into HTML based on provided data and a template.
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*
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* @param int $id The ID of the meme.
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* @param int $authorId The author's user ID.
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* @param string $title The title of the meme.
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* @param string $textContent The text content of the meme.
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* @param string $createdAt The creation timestamp of the meme.
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* @param string $filePath The file path of the associated image.
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* @param int $imageWidth The width of the image.
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* @param int $imageHeight The height of the image.
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* @param string $userNickname The nickname of the meme's author.
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* @param string $meme_template The HTML template for a meme. (used to not read the template over and over when rendering more memes)
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* @return string Returns the rendered HTML of the meme.
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*/
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function renderMeme(int $id, int $authorId, string $title, string $textContent, string $createdAt, string $filePath, int $imageWidth, int $imageHeight, string $userNickname, string $meme_template): string
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{
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$meme_out = str_replace('__TEMPLATE_MEME_TITLE__', htmlspecialchars($title), $meme_template);
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$meme_out = str_replace('__TEMPLATE_MEME_AUTHOR__', htmlspecialchars($userNickname), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_DATE__', htmlspecialchars($createdAt), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_IMAGE__', '/' . htmlspecialchars($filePath), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_IMAGE_WIDTH__', strval($imageWidth), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_IMAGE_HEIGHT__', strval($imageHeight), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_DELETE_BUTTON__', (isModerator() || $_SESSION['ID'] == $authorId) ? "<button onclick=\"deleteMeme($id);\"><i class='ri-delete-bin-line'></i></button>" : '', $meme_out);
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$meme_votes = calculateNetVotes($id);
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$meme_net_votes = $meme_votes['NetVotes'];
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if ($meme_votes['UserVote'] > 0) {
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$meme_upvote_active = 'fill';
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$meme_downvote_active = 'line';
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$meme_vote_counter_class = 'positive';
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$meme_upvote_button_class = ' visual_hover';
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$meme_downvote_button_class = '';
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} elseif (($meme_votes['UserVote'] < 0)) {
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$meme_upvote_active = 'line';
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$meme_downvote_active = 'fill';
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$meme_vote_counter_class = 'negative';
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$meme_upvote_button_class = '';
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$meme_downvote_button_class = ' visual_hover';
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} else {
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$meme_downvote_active = 'line';
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$meme_upvote_active = 'line';
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$meme_vote_counter_class = 'neutral';
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$meme_upvote_button_class = '';
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$meme_downvote_button_class = '';
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}
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$meme_upvote = isLoggedIn() ? "<button id='meme_votes_upvote_button_$id' class='meme_upvote$meme_upvote_button_class' onclick=\"voteMeme($id, 1);\"> <i id='meme_votes_upvote_$id' class=\"ri-arrow-up-circle-$meme_upvote_active\"></i></button>" : '';
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$meme_downvote = isLoggedIn() ? "<button id='meme_votes_downvote_button_$id' class='meme_downvote$meme_downvote_button_class' onclick=\"voteMeme($id, 0);\"> <i id='meme_votes_downvote_$id' class=\"ri-arrow-down-circle-$meme_downvote_active\"></i></button>" : '';
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$meme_out = str_replace('__TEMPLATE_MEME_VOTES_NUMBER__', strval($meme_net_votes), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_UPVOTE__', $meme_upvote, $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_DOWNVOTE__', $meme_downvote, $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_ID__', strval($id), $meme_out);
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$meme_out = str_replace('__TEMPLATE_MEME_VOTE_COUNTER_CLASS__', $meme_vote_counter_class, $meme_out);
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return str_replace('__TEMPLATE_MEME_TEXT__', htmlspecialchars($textContent), $meme_out);
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}
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/**
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* Renders a gallery of memes, optionally filtered by author ID, meme ID, or a keyword.
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*
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* This function retrieves memes from the database and returns an HTML string representation.
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* It supports filtering by author ID, meme ID, or a keyword that is searched in titles and text content.
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* It also supports pagination through an offset parameter.
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*
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* @param int|null $offset Pagination offset, used to calculate the starting point for records to return.
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* @param int|null $authorId Optional author ID for filtering memes by a specific author.
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* @param int|null $memeId Optional meme ID for rendering a single meme.
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* @param string|null $keyword Optional keyword for full-text search in meme titles and content.
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* @return string Returns the complete HTML content of the meme gallery, optionally filtered.
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*/
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function getMemeGallery(?int $offset = null, ?int $authorId = null, ?int $memeId = null, ?string $keyword = null): array {
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return [
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"Status" => "Success",
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"Output" => renderMemeGallery($offset, $authorId, $memeId, $keyword)
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];
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}
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function renderMemeGallery(?int $offset = null, ?int $authorId = null, ?int $memeId = null, ?string $keyword = null): string {
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global $mysqli, $routerConfig;
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// Start building the SQL query
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$query = 'SELECT Memes.ID, Memes.Title, Memes.TextContent, Memes.CreatedAt, Memes.AuthorID,
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Files.Path, Files.Width, Files.Height, Users.Nickname
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FROM Memes
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INNER JOIN Users ON Memes.AuthorID = Users.ID
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INNER JOIN Files ON Memes.FileID = Files.ID';
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$conditions = [];
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$params = [];
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$types = '';
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// Add conditions based on provided parameters
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if ($authorId !== null) {
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$conditions[] = 'Memes.AuthorID = ?';
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$params[] = $authorId;
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$types .= 'i';
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}
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if ($memeId !== null) {
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$conditions[] = 'Memes.ID = ?';
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$params[] = $memeId;
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$types .= 'i';
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}
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if ($keyword !== null) {
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$conditions[] = '(Memes.Title LIKE CONCAT("%", ?, "%") OR Memes.TextContent LIKE CONCAT("%", ?, "%"))';
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$params[] = $keyword;
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$params[] = $keyword;
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$types .= 'ss';
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}
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// Append conditions to the query
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if (!empty($conditions)) {
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$query .= ' WHERE ' . join(' AND ', $conditions);
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}
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if($offset == null) {
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$offset = 0;
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}
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// Add pagination and limit
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$query .= ' LIMIT ? OFFSET ?';
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$params[] = $routerConfig['meme']['per_page'];
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$params[] = $routerConfig['meme']['per_page'] * $offset;
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$types .= 'ii';
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$stmt = $mysqli->prepare($query);
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$stmt->bind_param($types, ...$params);
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return executeAndRenderMemes($stmt);
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}
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/**
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* Deletes a meme from the database if the current user has the right permissions.
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*
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* @param int $memeID The ID of the meme to delete.
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* @return array Returns an associative array with the status of the operation.
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* @global mysqli $mysqli The database connection object.
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*/
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function deleteMeme(int $memeID): array
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{
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global $mysqli;
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$out = ["Status" => "Fail"];
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if (isLoggedIn()) {
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$query = !isModerator() ? 'DELETE FROM Memes WHERE ID = ? AND AuthorID = ?' : 'DELETE FROM Memes WHERE ID = ?';
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$stmtDelete = $mysqli->prepare($query);
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if (!isModerator()) {
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$stmtDelete->bind_param('ii', $memeID, $_SESSION['ID']);
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} else {
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$stmtDelete->bind_param('i', $memeID);
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}
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$stmtDelete->execute();
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if ($stmtDelete->affected_rows > 0) {
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$out['Status'] = 'Success';
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}
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$stmtDelete->close();
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}
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return $out;
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}
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/**
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* Records or updates a vote on a meme by the current user.
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*
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* @param int $memeID The ID of the meme to be voted on.
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* @param int $isUpvote Indicates whether the vote is an upvote (1) or downvote (0).
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* @return array Returns an associative array with the status of the vote operation.
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* @global mysqli $mysqli The database connection object.
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*/
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function voteMeme(int $memeID, int $isUpvote): array
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{
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global $mysqli;
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$out = ["Status" => "Fail"];
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if ($isUpvote != 1) {
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$isUpvote = 0;
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}
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$memeVoteConn = $mysqli->prepare('INSERT INTO MemeVotes (MemeID, UserID, isUpvote) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE isUpvote = VALUES(isUpvote)');
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$memeVoteConn->bind_param('iii', $memeID, $_SESSION['ID'], $isUpvote);
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$memeVoteConn->execute();
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if ($memeVoteConn->affected_rows > 0) {
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$out['Status'] = 'Success';
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}
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$memeVoteConn->close();
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return $out;
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}
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/**
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* Deletes a vote previously made by the current user on a meme.
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*
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* @param int $memeID The ID of the meme whose vote is to be deleted.
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* @return array Returns an associative array with the status of the deletion.
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* @global mysqli $mysqli The database connection object.
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*/
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function deleteVoteMeme(int $memeID): array
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{
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global $mysqli;
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$out = ["Status" => "Fail"];
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$memeVoteConn = $mysqli->prepare('DELETE FROM MemeVotes WHERE MemeID = ? AND UserID = ?');
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$memeVoteConn->bind_param('ii', $memeID, $_SESSION['ID']);
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$memeVoteConn->execute();
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if ($memeVoteConn->affected_rows > 0) {
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$out['Status'] = 'Success';
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}
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$memeVoteConn->close();
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return $out;
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}
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/**
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* Calculates the net votes for a meme and determines if the current user has voted on it.
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* The array has both the net votes and the user vote(0 when the user hasn't voted)
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*
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* @param int $memeID The ID of the meme for which votes are being calculated.
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* @return array Returns an array with net votes and the user's vote status.
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* @global mysqli $mysqli The database connection object.
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*/
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function calculateNetVotes(int $memeID): array
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{
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global $mysqli;
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// Adjusted query to calculate net votes and get the user's vote in one go
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$query = "
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SELECT
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SUM(CASE WHEN isUpvote = 1 THEN 1 ELSE -1 END) AS NetVotes,
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(
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SELECT CASE WHEN isUpvote = 1 THEN 1 ELSE -1 END
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FROM MemeVotes
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WHERE MemeID = ? AND UserID = ?
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) AS UserVote
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FROM MemeVotes
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WHERE MemeID = ?";
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$stmt = $mysqli->prepare($query);
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$userID = $_SESSION['ID'];
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$stmt->bind_param('iii', $memeID, $userID, $memeID);
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$stmt->execute();
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$result = $stmt->get_result();
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$data = $result->fetch_assoc();
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$netVotes = $data['NetVotes'] ?? 0; // Null coalescing operator in case no votes are found
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$userVote = $data['UserVote'] ?? 0; // Default to 0 if the user hasn't voted
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$stmt->close();
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return [
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"NetVotes" => $netVotes,
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"UserVote" => $userVote
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];
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}
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/**
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* Fetches the net votes and user's vote status for a specific meme.
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* Essentially just a wrapper of getMemeVotes for an API call
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*
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* @param int $memeID The ID of the meme to fetch votes for.
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* @return array Returns an array with the net votes and the user's vote status, along with operation status.
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*/
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function getMemeVotes(int $memeID): array
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{
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$voteData = calculateNetVotes($memeID);
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return [
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"Status" => "Success",
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"NetVotes" => $voteData['NetVotes'],
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"UserVote" => $voteData['UserVote']
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];
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}
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