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<?php

function decode_mime_header($header) {

    $decoded = iconv_mime_decode($header, 0, 'UTF-8');

    return $decoded ?: $header;

}

function html_to_text($html) {

    $html = html_entity_decode($html, ENT_QUOTES | ENT_HTML5, 'UTF-8');

    $html = preg_replace('/<style[^>]*>.*?<\/style>/is', '', $html); // 스타일 제거

    $html = preg_replace('/<br\s*\/?>/i', "\n", $html);              // 줄바꿈 처리

    $html = preg_replace('/<\/p>/i', "\n", $html);                   // 문단 줄바꿈

    $text = strip_tags($html);                                       // 태그 제거

    $text = preg_replace("/\n{2,}/", "\n", $text);                   // 연속 줄바꿈 정리

    return trim($text);

}

function decode_mime_header_full($header) {

    $decoded = '';

    $parts = preg_split('/(=\?.+\?[BQbq]\?.+\?=)/', $header, -1, PREG_SPLIT_DELIM_CAPTURE);

    foreach ($parts as $part) {

        if (preg_match('/=\?(.+)\?([BQbq])\?(.+)\?=/', $part, $matches)) {

            $charset = strtoupper($matches[1]);

            $encoding = strtoupper($matches[2]);

            $text = $matches[3];

            if ($encoding === 'B') {

                $decoded_text = base64_decode($text);

            } elseif ($encoding === 'Q') {

                $decoded_text = quoted_printable_decode(str_replace('_', ' ', $text));

            } else {

                $decoded_text = $text;

            }

            $decoded .= iconv($charset, 'UTF-8//IGNORE', $decoded_text);

        } else {

            $decoded .= $part;

        }

    }

    return $decoded;

}

function decode_html_body($body, $content_type = 'text/html', $charset = 'UTF-8', $encoding = '') {

    // 인코딩 방식 확인

    if (stripos($encoding, 'base64') !== false) {

        $body = base64_decode(trim($body));

    } else {

        $body = quoted_printable_decode($body);

    }

    // 문자셋 변환

    if ($charset !== 'UTF-8') {

        $converted = @iconv($charset, 'UTF-8//IGNORE', $body);

        if ($converted !== false) {

            $body = $converted;

        }

    }

    // HTML 처리

    if ($content_type === 'text/html') {

        $body = html_entity_decode($body, ENT_QUOTES | ENT_HTML5, 'UTF-8');

        // 불필요한 태그 제거

        $body = preg_replace([

            '/<style[^>]*>.*?<\/style>/is',

            '/<script[^>]*>.*?<\/script>/is',

            '/<meta[^>]*>/i',

            '/<title[^>]*>.*?<\/title>/is',

            '/<html[^>]*>/i',

            '/<\/html>/i',

            '/<body[^>]*>/i',

            '/<\/body>/i'

        ], '', $body);

    }

    return trim($body);

}

function parse_mbox_file($user_id) {

    $path = MAIL_BOX_PATH . escapeshellcmd($user_id);

    if (!file_exists($path)) return [];

    $lines = @file($path);

    if (!$lines) return [];

    $mails = [];

    $current = '';

    foreach ($lines as $line) {

        if (preg_match('/^From\s.+@.+\s.+\d{4}$/', $line) && !empty($current)) {

            $mails[] = parse_single_mail($current);

            $current = '';

        }

        $current .= $line;

    }

    if (!empty($current)) {

        $mails[] = parse_single_mail($current);

    }

    return $mails;

}

function parse_single_mail($raw_mail) {

    $headers = [];

    $body = '';

    $lines = explode("\n", $raw_mail);

    $is_header = true;

    $last_key = '';

    foreach ($lines as $line) {

        if ($is_header) {

            if (trim($line) === '') {

                $is_header = false;

                continue;

            }

            if (preg_match('/^([A-Za-z\-]+):\s*(.*)$/', $line, $matches)) {

                $last_key = strtolower($matches[1]);

                $headers[$last_key] = $matches[2];

            } elseif (preg_match('/^\s+(.*)$/', $line, $matches) && $last_key) {

                $headers[$last_key] .= ' ' . $matches[1];

            }

        } else {

            $body .= $line . "\n";

        }

    }

    // boundary 추출

    $boundary = '';

    if (isset($headers['content-type']) && preg_match('/boundary="([^"]+)"/i', $headers['content-type'], $matches)) {

        $boundary = $matches[1];

    }

    // 파트 분리

    $parts = $boundary ? explode('--' . $boundary, $body) : [$body];

    $selected_part = '';

    $content_type = '';

    $charset = 'UTF-8';

    $encoding = '';

    foreach ($parts as $part) {

        // 첨부파일 제외

        if (stripos($part, 'Content-Disposition: attachment') !== false ||

            stripos($part, 'application/octet-stream') !== false) {

            continue;

        }

        // 본문 파트 선택

        if (stripos($part, 'Content-Type: text/html') !== false || stripos($part, 'Content-Type: text/plain') !== false) {

            if (preg_match('/Content-Type:\s*([^;\s]+)(?:;\s*charset=([^\s;]+))?/i', $part, $ct_matches)) {

                $content_type = strtolower(trim($ct_matches[1]));

                if (!empty($ct_matches[2])) {

                    $charset = strtoupper(trim($ct_matches[2]));

                }

            }

            if (preg_match('/Content-Transfer-Encoding:\s*([^\s]+)/i', $part, $enc_matches)) {

                $encoding = strtolower(trim($enc_matches[1]));

            }

            $selected_part = preg_replace('/^.*?\r?\n\r?\n/s', '', $part); // 헤더 제거

            break;

        }

    }

    // fallback: 본문이 없을 경우 전체 body 사용

    if (empty($selected_part)) {

        $selected_part = $body;

        $content_type = 'text/plain';

    }

    $clean_body = decode_html_body($selected_part, $content_type, $charset, $encoding);

    // HTML 템플릿 구성

    $html  = '<div class="mail-box" style="font-family: Arial, sans-serif; background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1);">';

    $html .= '<h2 style="margin-top:0;">' . htmlspecialchars(decode_mime_header_full($headers['subject'] ?? '(제목 없음)')) . '</h2>';

    $html .= '<p><strong>보낸 사람:</strong> ' . htmlspecialchars(decode_mime_header_full($headers['from'] ?? '')) . '</p>';

    $html .= '<p><strong>받는 사람:</strong> ' . htmlspecialchars(decode_mime_header_full($headers['to'] ?? '')) . '</p>';

    $html .= '<p><strong>날짜:</strong> ' . htmlspecialchars($headers['date'] ?? '(날짜 없음)') . '</p>';

    $html .= '<div>' . $clean_body . '</div>';

    $html .= '</div>';

    return [

        'mb_mail_id' => md5($raw_mail),

        'mb_mail_subject' => decode_mime_header_full($headers['subject'] ?? '(제목 없음)'),

        'mb_mail_from_email' => decode_mime_header_full($headers['from'] ?? ''),

        'mb_mail_to_email' => decode_mime_header_full($headers['to'] ?? ''),

        'mb_mail_date' => $headers['date'] ?? '(날짜 없음)',

        'mb_mail_body' => $html,

        'mb_mail_attachments' => '[]',

        'mb_mail_folder' => 'inbox',

    ];

}

?>

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노가다의 결과물..ㅠㅠ