| 1 |
<?php |
| 2 |
|
| 3 |
namespace LearnPress\AI\Assistant; |
| 4 |
|
| 5 |
use LearnPress\Services\OpenAiService; |
| 6 |
|
| 7 |
/** |
| 8 |
* QuickQuizEngine — generates and drives interactive quick quizzes. |
| 9 |
* |
| 10 |
* Handles quiz generation from lesson content (start) and stateful |
| 11 |
* answer evaluation across multiple turns (continue_session). |
| 12 |
* |
| 13 |
* @package LearnPress\AI\Assistant |
| 14 |
* @since 4.3.5 |
| 15 |
*/ |
| 16 |
class QuickQuizEngine { |
| 17 |
|
| 18 |
private const QUIZ_PROMPT_HISTORY_LIMIT = 3; |
| 19 |
private const HISTORY_CONTENT_MAX_CHARS = 400; |
| 20 |
|
| 21 |
private TokenQuotaGuard $quota_guard; |
| 22 |
private LanguageResolver $language_resolver; |
| 23 |
private ResponseNormalizer $normalizer; |
| 24 |
|
| 25 |
public function __construct( |
| 26 |
TokenQuotaGuard $quota_guard, |
| 27 |
LanguageResolver $language_resolver, |
| 28 |
ResponseNormalizer $normalizer |
| 29 |
) { |
| 30 |
$this->quota_guard = $quota_guard; |
| 31 |
$this->language_resolver = $language_resolver; |
| 32 |
$this->normalizer = $normalizer; |
| 33 |
} |
| 34 |
|
| 35 |
/** |
| 36 |
* Start a new interactive quick quiz from lesson content. |
| 37 |
* |
| 38 |
* @param DataLoaders $loaders Data loader instance. |
| 39 |
* @param string $user_message Learner input (may contain explicit count). |
| 40 |
* @param int $lesson_id Current lesson ID. |
| 41 |
* @param int $user_id Current user ID. |
| 42 |
* @param array $history Conversation history. |
| 43 |
* |
| 44 |
* @return array{type: string, message: string, quiz: array|null} |
| 45 |
*/ |
| 46 |
public function start( DataLoaders $loaders, string $user_message, int $lesson_id, int $user_id, array $history ): array { |
| 47 |
|
| 48 |
$lesson = $loaders->get_lesson_content( $lesson_id, $user_id ); |
| 49 |
if ( ! empty( $lesson['error'] ) ) { |
| 50 |
return $this->normalizer->build_response( $lesson['error'] ); |
| 51 |
} |
| 52 |
|
| 53 |
$service = OpenAiService::instance(); |
| 54 |
$history_slice = $this->slice_recent_history( $history, self::QUIZ_PROMPT_HISTORY_LIMIT ); |
| 55 |
$question_count = $this->extract_requested_quiz_count( $user_message ); |
| 56 |
$has_explicit_count = null !== $question_count; |
| 57 |
$language_guidance = $this->language_resolver->build_instruction( $user_message, $history_slice, $user_id ); |
| 58 |
|
| 59 |
$system_instructions = $has_explicit_count |
| 60 |
? sprintf( |
| 61 |
/* translators: %d: requested number of quiz questions. */ |
| 62 |
__( 'Create a quick quiz from lesson content. Return ONLY valid JSON with keys: intro (string), questions (array of exactly %d items). Each question must contain: question (string), options (array of 4 strings), correct_index (0-3 integer), explanation (string).', 'learnpress' ), |
| 63 |
$question_count |
| 64 |
) |
| 65 |
: __( 'Create a quick quiz from lesson content with 3-5 questions. Return ONLY valid JSON with keys: intro (string), questions (array of objects). Each question must contain: question (string), options (array of 4 strings), correct_index (0-3 integer), explanation (string).', 'learnpress' ); |
| 66 |
|
| 67 |
$messages = array( |
| 68 |
array( |
| 69 |
'role' => 'system', |
| 70 |
'content' => $system_instructions, |
| 71 |
), |
| 72 |
array( |
| 73 |
'role' => 'system', |
| 74 |
'content' => $language_guidance, |
| 75 |
), |
| 76 |
array( |
| 77 |
'role' => 'system', |
| 78 |
'content' => wp_json_encode( $lesson ), |
| 79 |
), |
| 80 |
); |
| 81 |
|
| 82 |
foreach ( $history_slice as $item ) { |
| 83 |
if ( ! empty( $item['role'] ) && isset( $item['content'] ) ) { |
| 84 |
$messages[] = array( |
| 85 |
'role' => $item['role'], |
| 86 |
'content' => $item['content'], |
| 87 |
); |
| 88 |
} |
| 89 |
} |
| 90 |
|
| 91 |
$messages[] = array( |
| 92 |
'role' => 'user', |
| 93 |
'content' => $user_message, |
| 94 |
); |
| 95 |
|
| 96 |
$response = $this->quota_guard->send_chat_with_guard( $service, $messages, $user_id ); |
| 97 |
if ( $this->quota_guard->is_blocked() ) { |
| 98 |
return $this->normalizer->build_response( $this->quota_guard->get_block_message() ); |
| 99 |
} |
| 100 |
|
| 101 |
$content = (string) ( $response['content'] ?? '' ); |
| 102 |
$decoded = $this->normalizer->decode_json( $content ); |
| 103 |
$questions = $this->sanitize_quiz_questions( $decoded['questions'] ?? array(), $question_count ); |
| 104 |
|
| 105 |
if ( empty( $questions ) ) { |
| 106 |
return $this->normalizer->build_response( __( 'I could not generate a quiz right now. Please try again.', 'learnpress' ) ); |
| 107 |
} |
| 108 |
|
| 109 |
$quiz_state = array( |
| 110 |
'is_active' => true, |
| 111 |
'completed' => false, |
| 112 |
'current_index' => 0, |
| 113 |
'score' => 0, |
| 114 |
'total' => count( $questions ), |
| 115 |
'questions' => $questions, |
| 116 |
); |
| 117 |
|
| 118 |
return array( |
| 119 |
'type' => 'quiz', |
| 120 |
'message' => $decoded['intro'] ?? __( 'Quick quiz started. Answer each question to continue.', 'learnpress' ), |
| 121 |
'quiz' => $quiz_state, |
| 122 |
); |
| 123 |
} |
| 124 |
|
| 125 |
/** |
| 126 |
* Process an answer for an active quiz session and advance quiz state. |
| 127 |
* |
| 128 |
* @param string $user_message Learner answer input. |
| 129 |
* @param array $state Current quiz state. |
| 130 |
* |
| 131 |
* @return array{type: string, message: string, quiz: array|null} |
| 132 |
*/ |
| 133 |
public function continue_session( string $user_message, array $state ): array { |
| 134 |
|
| 135 |
$questions = $state['questions'] ?? array(); |
| 136 |
$current = absint( $state['current_index'] ?? 0 ); |
| 137 |
$score = absint( $state['score'] ?? 0 ); |
| 138 |
|
| 139 |
if ( empty( $questions ) || ! isset( $questions[ $current ] ) ) { |
| 140 |
return $this->normalizer->build_response( __( 'Quiz state is invalid. Please start a new quick quiz.', 'learnpress' ) ); |
| 141 |
} |
| 142 |
|
| 143 |
$question = $questions[ $current ]; |
| 144 |
$answer_i = $this->parse_answer_index( $user_message, $question['options'] ?? array() ); |
| 145 |
|
| 146 |
if ( $answer_i === null ) { |
| 147 |
return array( |
| 148 |
'type' => 'quiz', |
| 149 |
'message' => __( 'Please answer with option number (1-4), letter (A-D), or full option text.', 'learnpress' ), |
| 150 |
'quiz' => $state, |
| 151 |
); |
| 152 |
} |
| 153 |
|
| 154 |
$correct_index = absint( $question['correct_index'] ?? 0 ); |
| 155 |
$is_correct = $answer_i === $correct_index; |
| 156 |
if ( $is_correct ) { |
| 157 |
++$score; |
| 158 |
} |
| 159 |
|
| 160 |
$next_index = $current + 1; |
| 161 |
$total = count( $questions ); |
| 162 |
|
| 163 |
$state['score'] = $score; |
| 164 |
$state['current_index'] = $next_index; |
| 165 |
$state['total'] = $total; |
| 166 |
$state['feedback'] = array( |
| 167 |
'is_correct' => $is_correct, |
| 168 |
'selected_index' => $answer_i, |
| 169 |
'selected_answer' => $question['options'][ $answer_i ] ?? '', |
| 170 |
'correct_index' => $correct_index, |
| 171 |
'correct_answer' => $question['options'][ $correct_index ] ?? '', |
| 172 |
'explanation' => $question['explanation'] ?? '', |
| 173 |
); |
| 174 |
|
| 175 |
if ( $next_index >= $total ) { |
| 176 |
$state['is_active'] = false; |
| 177 |
$state['completed'] = true; |
| 178 |
|
| 179 |
return array( |
| 180 |
'type' => 'quiz', |
| 181 |
'message' => sprintf( |
| 182 |
/* translators: 1: score, 2: total questions. */ |
| 183 |
__( 'Quiz complete. You scored %1$d/%2$d.', 'learnpress' ), |
| 184 |
$score, |
| 185 |
$total |
| 186 |
), |
| 187 |
'quiz' => $state, |
| 188 |
); |
| 189 |
} |
| 190 |
|
| 191 |
$state['is_active'] = true; |
| 192 |
$state['completed'] = false; |
| 193 |
|
| 194 |
$message = $is_correct |
| 195 |
? __( 'Correct. Great job! Moving to the next question.', 'learnpress' ) |
| 196 |
: __( 'Not quite. Let us move to the next question.', 'learnpress' ); |
| 197 |
|
| 198 |
return array( |
| 199 |
'type' => 'quiz', |
| 200 |
'message' => $message, |
| 201 |
'quiz' => $state, |
| 202 |
); |
| 203 |
} |
| 204 |
|
| 205 |
// ---------------------------------------------------------------- |
| 206 |
// Private helpers |
| 207 |
// ---------------------------------------------------------------- |
| 208 |
|
| 209 |
/** |
| 210 |
* Keep only recent and valid chat history rows for quiz-generation prompts. |
| 211 |
* |
| 212 |
* @param array $history Chat history. |
| 213 |
* @param int $limit Number of rows to keep from the end. |
| 214 |
* |
| 215 |
* @return array<int, array{role: string, content: string}> |
| 216 |
*/ |
| 217 |
private function slice_recent_history( array $history, int $limit ): array { |
| 218 |
|
| 219 |
$sanitized = array(); |
| 220 |
|
| 221 |
foreach ( $history as $item ) { |
| 222 |
if ( ! is_array( $item ) ) { |
| 223 |
continue; |
| 224 |
} |
| 225 |
|
| 226 |
$role = (string) ( $item['role'] ?? '' ); |
| 227 |
if ( ! in_array( $role, array( 'user', 'assistant' ), true ) ) { |
| 228 |
continue; |
| 229 |
} |
| 230 |
|
| 231 |
$content = trim( (string) ( $item['content'] ?? '' ) ); |
| 232 |
if ( '' === $content ) { |
| 233 |
continue; |
| 234 |
} |
| 235 |
|
| 236 |
$sanitized[] = array( |
| 237 |
'role' => $role, |
| 238 |
'content' => mb_substr( $content, 0, self::HISTORY_CONTENT_MAX_CHARS, 'UTF-8' ), |
| 239 |
); |
| 240 |
} |
| 241 |
|
| 242 |
if ( empty( $sanitized ) ) { |
| 243 |
return array(); |
| 244 |
} |
| 245 |
|
| 246 |
return array_slice( $sanitized, -1 * max( 1, $limit ) ); |
| 247 |
} |
| 248 |
|
| 249 |
/** |
| 250 |
* Parse learner answer into option index. |
| 251 |
* |
| 252 |
* Supports: numeric (1-4), letter (A-D), and exact option text. |
| 253 |
* |
| 254 |
* @param string $message Learner answer. |
| 255 |
* @param array $options Current question options. |
| 256 |
* |
| 257 |
* @return int|null |
| 258 |
*/ |
| 259 |
private function parse_answer_index( string $message, array $options ): ?int { |
| 260 |
|
| 261 |
$input = strtolower( trim( $message ) ); |
| 262 |
if ( $input === '' ) { |
| 263 |
return null; |
| 264 |
} |
| 265 |
|
| 266 |
if ( preg_match( '/^[1-4]$/', $input ) ) { |
| 267 |
return max( 0, (int) $input - 1 ); |
| 268 |
} |
| 269 |
|
| 270 |
$letters = array( |
| 271 |
'a' => 0, |
| 272 |
'b' => 1, |
| 273 |
'c' => 2, |
| 274 |
'd' => 3, |
| 275 |
); |
| 276 |
if ( isset( $letters[ $input ] ) ) { |
| 277 |
return $letters[ $input ]; |
| 278 |
} |
| 279 |
|
| 280 |
foreach ( $options as $index => $option ) { |
| 281 |
if ( strtolower( trim( (string) $option ) ) === $input ) { |
| 282 |
return (int) $index; |
| 283 |
} |
| 284 |
} |
| 285 |
|
| 286 |
return null; |
| 287 |
} |
| 288 |
|
| 289 |
/** |
| 290 |
* Extract the requested number of quiz questions from the learner message. |
| 291 |
* |
| 292 |
* Language-agnostic heuristic: |
| 293 |
* - Prefer explicit numeric forms (e.g. "/quick-quiz 5", "quiz 5", "5 quiz"). |
| 294 |
* - If only one standalone number is present, use it as requested count. |
| 295 |
* - Return null when count cannot be inferred reliably. |
| 296 |
* |
| 297 |
* @param string $message Learner input. |
| 298 |
* |
| 299 |
* @return int|null |
| 300 |
*/ |
| 301 |
private function extract_requested_quiz_count( string $message ): ?int { |
| 302 |
|
| 303 |
$normalized = trim( $message ); |
| 304 |
if ( '' === $normalized ) { |
| 305 |
return null; |
| 306 |
} |
| 307 |
|
| 308 |
$normalized = mb_strtolower( $normalized, 'UTF-8' ); |
| 309 |
$normalized = preg_replace( '/[^\p{L}\p{N}\s]+/u', ' ', $normalized ); |
| 310 |
$normalized = is_string( $normalized ) ? trim( preg_replace( '/\s+/', ' ', $normalized ) ?? '' ) : ''; |
| 311 |
if ( '' === $normalized ) { |
| 312 |
return null; |
| 313 |
} |
| 314 |
|
| 315 |
// Explicit command-like request: "/quick-quiz 5". |
| 316 |
if ( preg_match( '/\/(?:mini|quick)-?quiz\s+(\d{1,2})(?=\s|$)/u', $normalized, $matches ) ) { |
| 317 |
$count = (int) ( $matches[1] ?? 0 ); |
| 318 |
return ( $count >= 1 && $count <= 20 ) ? $count : null; |
| 319 |
} |
| 320 |
|
| 321 |
// Number close to "quiz" token works for most mixed-language requests. |
| 322 |
if ( preg_match( '/(?:quiz[^\p{N}]{0,20}(\d{1,2})|(\d{1,2})[^\p{N}]{0,20}quiz)/u', $normalized, $matches ) ) { |
| 323 |
$count = (int) ( $matches[1] ?: $matches[2] ?: 0 ); |
| 324 |
if ( $count >= 1 && $count <= 20 ) { |
| 325 |
return $count; |
| 326 |
} |
| 327 |
} |
| 328 |
|
| 329 |
// Fallback: if there is exactly one standalone number, treat it as count. |
| 330 |
if ( preg_match_all( '/(?<!\p{N})(\d{1,2})(?!\p{N})/u', $normalized, $matches ) && count( $matches[1] ) === 1 ) { |
| 331 |
$count = (int) $matches[1][0]; |
| 332 |
if ( $count >= 1 && $count <= 20 ) { |
| 333 |
return $count; |
| 334 |
} |
| 335 |
} |
| 336 |
|
| 337 |
return null; |
| 338 |
} |
| 339 |
|
| 340 |
/** |
| 341 |
* Sanitize and normalize generated quiz questions from model output. |
| 342 |
* |
| 343 |
* If $question_count is null, returns questions as-is (trusting OpenAI's output). |
| 344 |
* If $question_count is set, caps to exactly that many questions. |
| 345 |
* |
| 346 |
* @param array $questions Raw question payload. |
| 347 |
* @param int|null $question_count Maximum number of questions to keep, or null to trust model. |
| 348 |
* |
| 349 |
* @return array |
| 350 |
*/ |
| 351 |
private function sanitize_quiz_questions( array $questions, ?int $question_count = null ): array { |
| 352 |
|
| 353 |
if ( empty( $questions ) || ! is_array( $questions ) ) { |
| 354 |
return array(); |
| 355 |
} |
| 356 |
|
| 357 |
// If no explicit count, trust OpenAI's output (typically 3-5 questions). |
| 358 |
if ( $question_count === null ) { |
| 359 |
return array_filter( |
| 360 |
array_map( static fn( $q ) => is_array( $q ) ? $q : null, $questions ), |
| 361 |
static fn( $q ) => null !== $q |
| 362 |
); |
| 363 |
} |
| 364 |
|
| 365 |
$sanitized = array(); |
| 366 |
foreach ( $questions as $question ) { |
| 367 |
if ( ! is_array( $question ) ) { |
| 368 |
continue; |
| 369 |
} |
| 370 |
|
| 371 |
$options = $question['options'] ?? array(); |
| 372 |
if ( ! is_array( $options ) || count( $options ) < 2 ) { |
| 373 |
continue; |
| 374 |
} |
| 375 |
|
| 376 |
$clean_options = array_values( |
| 377 |
array_map( |
| 378 |
static fn( $option ) => sanitize_text_field( (string) $option ), |
| 379 |
$options |
| 380 |
) |
| 381 |
); |
| 382 |
|
| 383 |
$correct_index = absint( $question['correct_index'] ?? 0 ); |
| 384 |
if ( $correct_index >= count( $clean_options ) ) { |
| 385 |
$correct_index = 0; |
| 386 |
} |
| 387 |
|
| 388 |
$sanitized[] = array( |
| 389 |
'question' => sanitize_text_field( (string) ( $question['question'] ?? '' ) ), |
| 390 |
'options' => $clean_options, |
| 391 |
'correct_index' => $correct_index, |
| 392 |
'explanation' => sanitize_textarea_field( (string) ( $question['explanation'] ?? '' ) ), |
| 393 |
); |
| 394 |
|
| 395 |
if ( count( $sanitized ) >= max( 1, $question_count ) ) { |
| 396 |
break; |
| 397 |
} |
| 398 |
} |
| 399 |
|
| 400 |
return $sanitized; |
| 401 |
} |
| 402 |
} |
| 403 |
|
