<?php
/**
 * 通用辅助函数与字段白名单（供各模块 add/update/import 复用）
 */
require_once __DIR__ . '/db.php';
require_once __DIR__ . '/response.php';

/** 企业表可写入字段白名单（key => 类型标记：s字符串/i整数/d日期/n数字） */
const COMPANY_FIELDS = [
    'name_zh' => 's', 'name_en' => 's', 'display_name' => 's',
    'business_role' => 's', 'country' => 's', 'registration_number' => 's',
    'address' => 's', 'legal_form' => 's', 'legal_representative' => 's',
    'business_scope' => 's', 'established_date' => 'd', 'registered_capital' => 's',
    'industry' => 's', 'industry_subdivision' => 's',
    'latest_employee_count' => 'i', 'latest_annual_revenue' => 's',
    'is_listed' => 'i', 'stock_code' => 's', 'website' => 's',
];

/** 人员表可写入字段白名单 */
const PERSON_FIELDS = [
    'union_id' => 's', 'full_name' => 's', 'gender' => 's', 'nationality' => 's',
    'id_type' => 's', 'id_number' => 's', 'education' => 's', 'graduated_from' => 's',
    'hometown' => 's', 'work_location' => 's',
];

/** 媒体（社交账号）表可写入字段白名单 */
const MEDIA_FIELDS = [
    'owner_type' => 's', 'owner_id' => 'i', 'platform' => 's', 'account_id' => 's',
    'profile_url' => 's', 'remark' => 's', 'is_primary' => 'i',
];

/** 媒体商业属性表可写入字段白名单 */
const MEDIA_ATTR_FIELDS = [
    'account_level' => 's', 'content_categories' => 's', 'follower_count' => 'i',
    'avg_read_count' => 'i', 'certification_type' => 's',
    'special_requirements' => 's', 'media_remark' => 's',
];

/** 需求表可写入字段白名单 */
const NEED_FIELDS = [
    'company_id' => 'i', 'contact_person' => 's', 'need_category' => 's',
    'target_product_category' => 's', 'application_scenario' => 's', 'description' => 's',
];

/**
 * 从 POST 中按白名单提取并清洗数据
 * @param array $allowlist
 * @return array
 */
function extractFields($allowlist)
{
    $data = [];
    foreach ($allowlist as $key => $type) {
        $val = $_POST[$key] ?? null;
        if ($val === null) {
            continue;
        }
        $val = trim((string)$val);
        if ($val === '') {
            continue;
        }
        switch ($type) {
            case 'i':
                $data[$key] = (int)$val;
                break;
            case 'd':
                $data[$key] = (strtotime($val) !== false) ? date('Y-m-d', strtotime($val)) : null;
                break;
            default:
                $data[$key] = $val;
        }
    }
    return $data;
}

/** 生成 INSERT 语句片段：字段名列表 + 占位符 */
function buildInsert($data)
{
    $cols = array_keys($data);
    $sql  = '(`' . implode('`,`', $cols) . '`) VALUES (' . rtrim(str_repeat('?,', count($cols)), ',') . ')';
    return [$sql, array_values($data)];
}

/** 生成 UPDATE SET 片段 */
function buildUpdate($data)
{
    $sets = [];
    foreach (array_keys($data) as $col) {
        $sets[] = "`$col` = ?";
    }
    return [implode(',', $sets), array_values($data)];
}