<?php

function cleanLabel($label) {
    return trim(str_replace(':', '', $label));
}

function extractMeaningsFromHtml($htmlContent) {
    $dom = new DOMDocument();

    libxml_use_internal_errors(true);
    $dom->loadHTML('<?xml encoding="utf-8" ?>' . $htmlContent);
    libxml_clear_errors();

    $xpath = new DOMXPath($dom);

    $acceptedLabels = [
        'مترادف', 'مترادف‌ها',
        'متضاد',
        'معنی', 'معنی انگلیسی',
        'برابر پارسی',
    ];

    $acceptedSources = [
        'لغت نامه دهخدا',
        'فرهنگ معین',
        'فرهنگ عمید',
        'فرهنگ فارسی',
        'دانشنامه آزاد فارسی',
        'ویکی فقه'
    ];

    $results = [];

    // بخش اول: پردازش <b> ها
    $boldTags = $xpath->query('//b');

    foreach ($boldTags as $b) {
        $label = trim($b->textContent);
        $cleanedLabel = cleanLabel($label);

        $match = false;
        foreach ($acceptedLabels as $accepted) {
            if (strpos($label, $accepted) !== false) {
                $match = true;
                break;
            }
        }

        if (!$match) continue;

        $meaning = '';
        $current = $b->nextSibling;

        while ($current) {
            if ($current->nodeType === XML_TEXT_NODE) {
                $meaning .= $current->textContent;
            } elseif ($current->nodeType === XML_ELEMENT_NODE && strtolower($current->nodeName) === 'br') {
                break;
            } elseif ($current->nodeType === XML_ELEMENT_NODE) {
                $meaning .= ' ' . $current->textContent;
            }
            $current = $current->nextSibling;
        }

        $meaning = trim($meaning);
        if (substr($meaning, 0, 1) === ':') {
            $meaning = trim(substr($meaning, 1));
        }

        if (!empty($meaning)) {
            $results[] = [
                'label' => $cleanedLabel,
                'meaning' => $meaning
            ];
        }
    }

    // بخش دوم: پردازش <div class="lun">
    $lunDivs = $xpath->query('//div[contains(@class, "lun")]');

    foreach ($lunDivs as $lun) {
        if ($lun->hasAttribute('t')) {
            $source = trim($lun->getAttribute('t'));

            if (in_array($source, $acceptedSources)) {
                $article = $xpath->query('.//article', $lun);
                if ($article->length > 0) {
                    $meaning = trim($article[0]->textContent);
                    if (!empty($meaning)) {
                        $results[] = [
                            'label' => $source,
                            'meaning' => $meaning
                        ];
                    }
                }
            }
        }
    }

    return $results;
}

function initDatabase() {
    $db = new SQLite3('words.db');
    $db->exec("
        CREATE TABLE IF NOT EXISTS words (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            word TEXT UNIQUE,
            json_data TEXT,
            search_count INTEGER DEFAULT 1,
            created_at DATETIME DEFAULT CURRENT_TIMESTAMP
        )
    ");
    return $db;
}

function getWordFromDb($db, $word) {
    $stmt = $db->prepare("SELECT json_data FROM words WHERE word = :word");
    $stmt->bindValue(':word', $word, SQLITE3_TEXT);
    $result = $stmt->execute();
    $row = $result->fetchArray(SQLITE3_ASSOC);

    if ($row) {
        // افزایش شمارش جستجو
        $db->exec("UPDATE words SET search_count = search_count + 1 WHERE word = '" . SQLite3::escapeString($word) . "'");
        return $row['json_data'];
    }

    return null;
}

function saveWordToDb($db, $word, $jsonData) {
    $stmt = $db->prepare("
        INSERT INTO words (word, json_data, search_count) 
        VALUES (:word, :json_data, 1)
        ON CONFLICT(word) DO UPDATE SET 
            json_data = excluded.json_data,
            search_count = words.search_count + 1
    ");
    $stmt->bindValue(':word', $word, SQLITE3_TEXT);
    $stmt->bindValue(':json_data', $jsonData, SQLITE3_TEXT);
    $stmt->execute();
}

// ======= API Response =======

header('Content-Type: application/json; charset=utf-8');

if (!isset($_GET['word']) || empty($_GET['word'])) {
    echo json_encode([
        'success' => false,
        'message' => 'پارامتر "word" ارسال نشده است.',
        'data' => []
    ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    exit;
}

$word = $_GET['word'];
$encodedWord = urlencode($word);

$db = initDatabase();
$cached = getWordFromDb($db, $word);

if ($cached) {
    echo $cached;
    exit;
}

// اگر در دیتابیس نبود، از وب بگیر
$url = "https://abadis.ir/fatofa/$encodedWord/";
$htmlContent = @file_get_contents($url);

if ($htmlContent === false) {
    echo json_encode([
        'success' => false,
        'message' => 'دریافت داده از سایت ابادیس با خطا مواجه شد.',
        'data' => []
    ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    exit;
}

$data = extractMeaningsFromHtml($htmlContent);

if (empty($data)) {
    $output = json_encode([
        'success' => false,
        'message' => "هیچ معنی مرتبط برای \"$word\" پیدا نشد.",
        'data' => []
    ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    echo $output;
} else {
    $output = json_encode([
        'success' => true,
        'word' => $word,
        'result_count' => count($data),
        'data' => $data
    ], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
    saveWordToDb($db, $word, $output);
    echo $output;
}
?>