123 lines
3.8 KiB
PHP
123 lines
3.8 KiB
PHP
<?php
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header('Content-Type: application/json');
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require_once __DIR__ . '/../db/config.php';
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require_once __DIR__ . '/../ai/LocalAIApi.php';
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function chatTableExists(string $table): bool
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{
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static $cache = [];
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$table = strtolower($table);
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if (array_key_exists($table, $cache)) {
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return $cache[$table];
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}
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try {
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$stmt = db()->prepare("SELECT 1 FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ? LIMIT 1");
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$stmt->execute([$table]);
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$cache[$table] = (bool)$stmt->fetchColumn();
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} catch (Throwable $e) {
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$cache[$table] = false;
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}
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return $cache[$table];
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}
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function chatColumnExists(string $table, string $column): bool
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{
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static $cache = [];
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$cacheKey = strtolower($table . '.' . $column);
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if (array_key_exists($cacheKey, $cache)) {
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return $cache[$cacheKey];
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}
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try {
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$stmt = db()->prepare("SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ? AND COLUMN_NAME = ? LIMIT 1");
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$stmt->execute([$table, $column]);
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$cache[$cacheKey] = (bool)$stmt->fetchColumn();
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} catch (Throwable $e) {
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$cache[$cacheKey] = false;
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}
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return $cache[$cacheKey];
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}
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function chatFetchFaqs(): array
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{
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if (!chatTableExists('faqs') || !chatColumnExists('faqs', 'keywords') || !chatColumnExists('faqs', 'answer')) {
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return [];
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}
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$stmt = db()->query("SELECT keywords, answer FROM faqs");
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return $stmt ? $stmt->fetchAll(PDO::FETCH_ASSOC) : [];
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}
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function chatStoreMessage(string $userMessage, string $aiResponse): void
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{
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if (!chatTableExists('messages') || !chatColumnExists('messages', 'user_message') || !chatColumnExists('messages', 'ai_response')) {
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return;
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}
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try {
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$stmt = db()->prepare("INSERT INTO messages (user_message, ai_response) VALUES (?, ?)");
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$stmt->execute([$userMessage, $aiResponse]);
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} catch (Throwable $e) {
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error_log('DB Save Error: ' . $e->getMessage());
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}
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}
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$input = json_decode(file_get_contents('php://input'), true);
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$message = $input['message'] ?? '';
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if (empty($message)) {
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echo json_encode(['reply' => "I didn't catch that. Could you repeat?"]);
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exit;
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}
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try {
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$faqs = chatFetchFaqs();
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$knowledgeBase = '';
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if ($faqs !== []) {
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$knowledgeBase = "Here is the knowledge base for this website:
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";
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foreach ($faqs as $faq) {
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$knowledgeBase .= "Q: " . ($faq['keywords'] ?? '') . "
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A: " . ($faq['answer'] ?? '') . "
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---
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";
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}
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}
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$systemPrompt = "You are a helpful, friendly AI assistant for this website. " .
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"Use the provided Knowledge Base to answer user questions accurately. " .
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"If the answer is found in the Knowledge Base, rephrase it naturally. " .
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"If the answer is NOT in the Knowledge Base, use your general knowledge to help, " .
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"but politely mention that you don't have specific information about that if it seems like a site-specific question. " .
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"Keep answers concise and professional.
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" .
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$knowledgeBase;
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$response = LocalAIApi::createResponse([
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'input' => [
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['role' => 'system', 'content' => $systemPrompt],
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['role' => 'user', 'content' => $message],
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],
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]);
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if (!empty($response['success'])) {
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$aiReply = LocalAIApi::extractText($response);
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chatStoreMessage($message, $aiReply);
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echo json_encode(['reply' => $aiReply]);
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} else {
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error_log('AI Error: ' . ($response['error'] ?? 'Unknown'));
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echo json_encode(['reply' => "I'm having trouble connecting to my brain right now. Please try again later."]);
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}
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} catch (Throwable $e) {
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error_log('Chat Error: ' . $e->getMessage());
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echo json_encode(['reply' => 'An internal error occurred.']);
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}
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