deepseek_chatbot/api/chatbot.php

<?php

require_once 'CSVReader.php';
require_once 'PDFReader.php';
require_once 'PromptBuilder.php';

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


// only accept POST requests
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Only POST allowed']);
    exit;
}


// Build prompt for deepseek
$input = json_decode(file_get_contents('php://input'), true);
$question = isset($input['question']) ? $input['question'] : '';
$roleFile = __DIR__ . '/data/role.txt';
$roleText = file_exists($roleFile) ? file_get_contents($roleFile) : '';


// Reading CSV data
$csvReader = new CSVReader(__DIR__ . '/data/csv');
$csvRows    = $csvReader->readAll();
$contextText = $csvReader->toString($csvRows);


// Reading PDF data
$pdfReader = new PDFReader(__DIR__ . '/data/pdf');
$pdfData = $pdfReader->readAll();
$pdfContext = $pdfReader->toString($pdfData);


// TODO: Read HTML data
$htmlContext = '';


$prompt = new PromptBuilder();
$prompt->setRole($roleText);
$prompt->setQuestion($question);


$promptContext = "\nCSV-Kontext:\n" . $contextText;
$promptContext .= "\nPDF-Kontext:\n" . $pdfContext;
$promptContext .= "\nHTML-Wissensdatenbank:\n" . $htmlContext;


$prompt->setContext($contextText);


$fullPrompt = $prompt->buildPromptString();


error_log("System prompt length: " . strlen($fullPrompt));


$payload = $prompt->buildPromptData();

//Starting Prompt Generation
$start = microtime(true);
$ch = curl_init('http://localhost:1234/api/v0/chat/completions');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);
$end = microtime(true);


$responseText = isset($data['choices'][0]['message']['content']) ? $data['choices'][0]['message']['content'] : '';
$responseText = trim($responseText);

echo json_encode([
    'reply' => $responseText,
    'duration_seconds' => round($end - $start, 3)
]);