<?php
declare(strict_types=1);

require_once __DIR__ . '/../includes/LegalTools.php';
require_once __DIR__ . '/../includes/ToolModels.php';

dbnToolsRequireMethod('POST');
dbnToolsRequireAuth();
$input = dbnToolsJsonInput(400000);
$_validEngines  = ['nova_lite', 'azure_mini', 'azure_full'];
$_engine        = in_array((string)($input['engine'] ?? ''), $_validEngines, true)
    ? (string)$input['engine'] : 'azure_mini';
$_engineCredits = $_engine === 'azure_full' ? 2 : 1;
$ftUid    = dbnToolsFreeTierCheckAmount('timeline', $_engineCredits);
$language = dbnToolsNormalizeLanguage($input['language'] ?? 'en');

dbnToolsWithChargedTelemetry('timeline', $language, $ftUid, function () use ($input, $language, $ftUid): array {
    $text = dbnToolsInjectDocContent($input, dbnToolsString($input, 'text', 128000, false));
    if (mb_strlen(trim($text), 'UTF-8') < 10) {
        dbnToolsAbort('Paste text, upload a file, or select a document before running.', 422, 'empty_text');
    }

    $validEngines = ['nova_lite', 'azure_mini', 'azure_full'];
    $engine = in_array((string)($input['engine'] ?? ''), $validEngines, true)
        ? (string)$input['engine'] : 'azure_mini';
    $engine = ToolModels::engineForUser($ftUid, $engine);

    $validFocus = ['all', 'deadlines', 'hearings', 'cps'];
    $focus = in_array((string)($input['focus'] ?? ''), $validFocus, true)
        ? (string)$input['focus'] : 'all';

    $confidenceFilter = (string)($input['confidence_filter'] ?? '') === 'high_medium'
        ? 'high_medium' : 'all';

    $includeRelative   = ($input['include_relative']   ?? true) !== false;
    $includeBackground = ($input['include_background'] ?? true) !== false;
    $userNotes         = dbnToolsString($input, 'user_notes', 2000, false);

    // Optional: prepend the user's case-context chunks so the timeline includes events
    // referenced in their uploaded case documents.
    $useMyCase = !empty($input['use_my_case']);
    if ($useMyCase) {
        $caseBlock = dbnToolsCaseContext(true, $text, 5);
        if ($caseBlock !== '') {
            $text = $text . "\n\n" . $caseBlock;
        }
    }

    $result = (new DbnLegalToolsService())->timeline($text, $language, $engine, $focus, $confidenceFilter, $includeRelative, $includeBackground, $userNotes, null);

    return $result;
}, $_engineCredits);