links/application/common/service/SplitAutoReplyService.php

<?php

declare(strict_types=1);

namespace app\common\service;

/**
 * 分流链接自动回复语句（一行一条）
 */
class SplitAutoReplyService
{
    /** 最多条数 */
    private const MAX_LINES = 200;

    /** 单条最大字符数 */
    private const MAX_LINE_LENGTH = 500;

    /** 列表预览最大字符数 */
    private const LIST_PREVIEW_MAX = 20;

    /**
     * 列表单元格预览（单行最多 50 字，超出加 ...）
     */
    public static function previewForList(string $raw, int $max = self::LIST_PREVIEW_MAX): string
    {
        $display = self::formatDisplay($raw);
        if ($display === '') {
            return '';
        }
        $flat = preg_replace('/\s+/u', ' ', str_replace(["\r\n", "\r", "\n"], ' ', $display));
        $flat = trim((string) $flat);
        if ($flat === '') {
            return '';
        }
        if (mb_strlen($flat, 'UTF-8') <= $max) {
            return $flat;
        }
        return mb_substr($flat, 0, $max, 'UTF-8') . '...';
    }

    /**
     * 解析为多行文本数组
     *
     * @return array<int, string>
     */
    public static function parseLines(string $raw): array
    {
        $raw = trim($raw);
        if ($raw === '') {
            return [];
        }
        $parts = preg_split('/\r\n|\r|\n/', $raw) ?: [];
        $lines = [];
        foreach ($parts as $part) {
            $line = trim((string) $part);
            if ($line === '') {
                continue;
            }
            if (strlen($line) > self::MAX_LINE_LENGTH) {
                $line = mb_substr($line, 0, self::MAX_LINE_LENGTH, 'UTF-8');
            }
            $lines[] = $line;
            if (count($lines) >= self::MAX_LINES) {
                break;
            }
        }
        return $lines;
    }

    /**
     * 格式化为数据库存储（换行分隔）
     *
     * @param string|array<int, string> $value
     */
    public static function formatStorage($value): string
    {
        if (is_array($value)) {
            $lines = $value;
        } else {
            $lines = self::parseLines((string) $value);
        }
        return implode("\n", $lines);
    }

    /**
     * 供表单 textarea 回显
     */
    public static function formatDisplay(string $stored): string
    {
        $lines = self::parseLines($stored);
        return implode("\n", $lines);
    }
}