<?php
declare(strict_types=1);
ini_set('display_errors', '0');
error_reporting(E_ALL);

header('Content-Type: application/json');

require_once __DIR__ . '/../ai/LocalAIApi.php';

// Get the user's message from the POST request
$input = json_decode(file_get_contents('php://input'), true);
$userMessage = $input['message'] ?? '';

if (empty($userMessage)) {
    echo json_encode(['error' => 'Message is empty.']);
    exit;
}

$aiReply = 'Sorry, I could not process your request at the moment.';
$responseSuccess = false;

try {
    $systemPrompt = 'You are a friendly and helpful AI assistant for IBMR Festverse, a college event management platform. Your goal is to answer questions about events, help users discover fests, and provide information about the platform. Keep your answers concise and cheerful.';

    // Create the payload for the AI API
    $payload = [
        'input' => [
            ['role' => 'system', 'content' => $systemPrompt],
            ['role' => 'user', 'content' => $userMessage],
        ],
    ];

    // Options for the API call
    $options = [
        'poll_interval' => 5,  // seconds
        'poll_timeout'  => 120 // seconds
    ];

    // Call the AI service
    $resp = LocalAIApi::createResponse($payload, $options);

    if (!empty($resp['success'])) {
        $text = LocalAIApi::extractText($resp);
        if ($text !== '') {
            $aiReply = $text;
            $responseSuccess = true;
        } else {
            // Handle cases where AI gives a non-text response or empty text
            $aiReply = 'I received a response, but it was empty. Can you try rephrasing?';
        }
    } else {
        error_log('AI API Error: ' . ($resp['error'] ?? 'Unknown error'));
        $aiReply = 'There was an issue connecting to the AI service. Please try again later.';
    }

} catch (Exception $e) {
    error_log('AI Chat Exception: ' . $e->getMessage());
    $aiReply = 'A server error occurred. We are looking into it.';
}

if ($responseSuccess) {
    echo json_encode(['reply' => $aiReply]);
} else {
    // In case of an error, we still return a JSON response with a user-friendly message
    // The specific error is logged on the server for debugging
    echo json_encode(['reply' => $aiReply]);
}