<?php
declare(strict_types=1);

require_once __DIR__ . '/../includes/bootstrap.php';
require_once __DIR__ . '/../includes/DeepResearchAgent.php';

dbnToolsRequireMethod('POST');
dbnToolsRequireAuth();

$isMultipart = stripos((string)($_SERVER['CONTENT_TYPE'] ?? ''), 'multipart/form-data') !== false;

if ($isMultipart) {
    $payloadRaw = (string)($_POST['payload'] ?? '');
    if ($payloadRaw === '') {
        dbnToolsError('Multipart request is missing the "payload" JSON field.', 422, 'missing_payload');
    }
    $input = json_decode($payloadRaw, true);
    if (!is_array($input)) {
        dbnToolsError('Multipart "payload" field must be valid JSON.', 422, 'invalid_payload_json');
    }
} else {
    $input = dbnToolsJsonInput(120000);
}

$language = dbnToolsNormalizeLanguage($input['language'] ?? 'en');

dbnToolsWithTelemetry('deep_research', $language, function () use ($input, $language) {
    $seedQuery   = dbnToolsString($input, 'query', 4000, false);
    $pastedText  = dbnToolsString($input, 'paste_text', 64000, false);
    $sliceInput  = $input['slices'] ?? null;
    $engine      = (string)($input['engine'] ?? 'azure_mini');
    $controls    = is_array($input['controls'] ?? null) ? $input['controls'] : [];

    $uploadedFiles = [];
    if (!empty($_FILES['files']) && is_array($_FILES['files']['tmp_name'] ?? null)) {
        $count = count($_FILES['files']['tmp_name']);
        if ($count > 5) {
            dbnToolsAbort('At most 5 files can be uploaded per request.', 413, 'too_many_files');
        }
        for ($i = 0; $i < $count; $i++) {
            $file = [
                'name'     => $_FILES['files']['name'][$i]     ?? '',
                'type'     => $_FILES['files']['type'][$i]     ?? '',
                'tmp_name' => $_FILES['files']['tmp_name'][$i] ?? '',
                'error'    => $_FILES['files']['error'][$i]    ?? UPLOAD_ERR_NO_FILE,
                'size'     => $_FILES['files']['size'][$i]     ?? 0,
            ];
            $extracted = dbnToolsExtractUploadedFile($file);
            $uploadedFiles[] = [
                'filename'  => $extracted['filename'],
                'text'      => $extracted['text'],
                'chars'     => $extracted['chars'],
                'truncated' => $extracted['truncated'],
            ];
        }
    }

    return (new DbnDeepResearchAgent())->run(
        $seedQuery,
        $pastedText,
        $uploadedFiles,
        is_array($sliceInput) ? $sliceInput : [],
        $engine,
        $language,
        $controls
    );
});