<?php
/**
 * 全局唯一性校验（2026-08-09）
 * 手机号码 / 邮箱 / 身份证号码 / 企业注册号 / 社媒账号ID / 主页链接 / 企业名称
 * 新增、修改时必须调用；重复时返回重复记录信息（供前端弹窗 + 跳转定位）
 * 说明：
 *  - 手机/邮箱存在 social_accounts（platform=phone/email）
 *  - 社媒账号ID 同平台内唯一（wechat/douyin 等，不含 phone/email）
 *  - 主页链接 social_accounts.profile_url 全局唯一（非空才校验）
 *  - 企业名称 name_zh 或 display_name 任一相同即重复
 */
require_once __DIR__ . '/db.php';

/** 字段中文名 */
const DUP_LABELS = [
    'phone' => '手机号码',
    'email' => '邮箱',
    'id_number' => '身份证号码',
    'registration_number' => '企业注册号',
    'account_id' => '社媒账号ID',
    'profile_url' => '主页链接',
    'company_name' => '企业名称',
];

/**
 * 查询 social_accounts 重复记录（phone/email/account_id/profile_url 共用）
 * @return array|null
 */
function findSocialDuplicate(PDO $pdo, $where, $params)
{
    $sql =
        "SELECT sa.id, sa.owner_type, sa.owner_id,
                COALESCE(p.full_name, c.display_name) AS owner_name
         FROM social_accounts sa
         LEFT JOIN persons p ON p.id = sa.owner_id AND sa.owner_type = 'person'
         LEFT JOIN companies c ON c.id = sa.owner_id AND sa.owner_type = 'company'
         WHERE $where AND sa.is_active = 1
         LIMIT 1";
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $row = $stmt->fetch();
    if (!$row) {
        return null;
    }
    return $row;
}

/**
 * 校验唯一性
 * @param PDO    $pdo
 * @param string $type phone|email|id_number|registration_number|account_id|profile_url|company_name
 * @param string $value 待校验值
 * @param array  $excludeIds 排除自身记录ID（编辑时；social_accounts 传其 id / persons 传 persons.id / companies 传 companies.id）
 * @param string|null $platform account_id 类型时必传（同平台内唯一）
 * @return array|null {label,value,table,id,owner_type,owner_id,name,owner_label,jump}
 */
function findDuplicate(PDO $pdo, $type, $value, $excludeIds = [], $platform = null)
{
    $value = trim((string)$value);
    if ($value === '') {
        return null;
    }
    $excludeIds = array_values(array_filter(array_map('intval', (array)$excludeIds)));

    $excludeSql = '';
    $excludeParams = [];
    if ($excludeIds) {
        $excludeSql = ' AND id NOT IN (' . implode(',', $excludeIds) . ')';
    }

    switch ($type) {
        case 'phone':
        case 'email':
            $row = findSocialDuplicate($pdo, "sa.platform = ? AND LOWER(sa.account_id) = LOWER(?)" . str_replace('id NOT IN', 'sa.id NOT IN', $excludeSql), array_merge([$type, $value], $excludeParams));
            if (!$row) {
                return null;
            }
            return [
                'label' => $type === 'phone' ? '手机号码' : '邮箱',
                'value' => $value,
                'table' => 'social_accounts',
                'id'    => (int)$row['id'],
                'owner_type' => $row['owner_type'],
                'owner_id'   => (int)$row['owner_id'],
                'name'       => $row['owner_name'] ?: ('#' . $row['owner_id']),
                'owner_label'=> $row['owner_type'] === 'person' ? '人员' : '企业',
                'jump' => 'media.html?id=' . (int)$row['id'],
            ];

        case 'account_id':
            // 社媒账号：同平台内唯一（phone/email 走专门校验）
            if ($platform === null || in_array($platform, ['phone', 'email'], true)) {
                return null;
            }
            $row = findSocialDuplicate($pdo, "sa.platform = ? AND LOWER(sa.account_id) = LOWER(?)" . str_replace('id NOT IN', 'sa.id NOT IN', $excludeSql), array_merge([$platform, $value], $excludeParams));
            if (!$row) {
                return null;
            }
            return [
                'label' => '社媒账号ID',
                'value' => $value,
                'table' => 'social_accounts',
                'id'    => (int)$row['id'],
                'owner_type' => $row['owner_type'],
                'owner_id'   => (int)$row['owner_id'],
                'name'       => $row['owner_name'] ?: ('#' . $row['owner_id']),
                'owner_label'=> $row['owner_type'] === 'person' ? '人员' : '企业',
                'jump' => 'media.html?id=' . (int)$row['id'],
            ];

        case 'profile_url':
            $row = findSocialDuplicate($pdo, "sa.profile_url = ? AND sa.profile_url <> ''" . str_replace('id NOT IN', 'sa.id NOT IN', $excludeSql), array_merge([$value], $excludeParams));
            if (!$row) {
                return null;
            }
            return [
                'label' => '主页链接',
                'value' => $value,
                'table' => 'social_accounts',
                'id'    => (int)$row['id'],
                'owner_type' => $row['owner_type'],
                'owner_id'   => (int)$row['owner_id'],
                'name'       => $row['owner_name'] ?: ('#' . $row['owner_id']),
                'owner_label'=> $row['owner_type'] === 'person' ? '人员' : '企业',
                'jump' => 'media.html?id=' . (int)$row['id'],
            ];

        case 'id_number':
            $stmt = $pdo->prepare("SELECT id, full_name FROM persons WHERE id_number = ? AND is_active = 1$excludeSql LIMIT 1");
            $stmt->execute(array_merge([$value], $excludeParams));
            $row = $stmt->fetch();
            if (!$row) {
                return null;
            }
            return [
                'label' => '身份证号码',
                'value' => $value,
                'table' => 'persons',
                'id'    => (int)$row['id'],
                'name'  => $row['full_name'] ?: ('#' . $row['id']),
                'jump'  => 'person.html?id=' . (int)$row['id'],
            ];

        case 'registration_number':
            $stmt = $pdo->prepare("SELECT id, display_name FROM companies WHERE registration_number = ? AND is_active = 1$excludeSql LIMIT 1");
            $stmt->execute(array_merge([$value], $excludeParams));
            $row = $stmt->fetch();
            if (!$row) {
                return null;
            }
            return [
                'label' => '企业注册号',
                'value' => $value,
                'table' => 'companies',
                'id'    => (int)$row['id'],
                'name'  => $row['display_name'] ?: ('#' . $row['id']),
                'jump'  => 'company.html?id=' . (int)$row['id'],
            ];

        case 'company_name':
            $stmt = $pdo->prepare("SELECT id, display_name FROM companies WHERE (name_zh = ? OR display_name = ?) AND is_active = 1$excludeSql LIMIT 1");
            $stmt->execute(array_merge([$value, $value], $excludeParams));
            $row = $stmt->fetch();
            if (!$row) {
                return null;
            }
            return [
                'label' => '企业名称',
                'value' => $value,
                'table' => 'companies',
                'id'    => (int)$row['id'],
                'name'  => $row['display_name'] ?: ('#' . $row['id']),
                'jump'  => 'company.html?id=' . (int)$row['id'],
            ];
    }
    return null;
}

/**
 * 校验单条账号（媒体模块扁平字段），返回所有重复项数组（空=无重复）
 * @param PDO $pdo
 * @param string $platform
 * @param string $accountId
 * @param string $profileUrl
 * @param array $excludeIds
 * @return array
 */
function checkSingleAccountDuplicate(PDO $pdo, $platform, $accountId, $profileUrl = '', $excludeIds = [])
{
    $dups = [];
    $platform  = trim((string)$platform);
    $accountId = trim((string)$accountId);
    if ($platform !== '' && $accountId !== '') {
        if ($platform === 'phone' || $platform === 'email') {
            $dup = findDuplicate($pdo, $platform, $accountId, $excludeIds);
        } else {
            $dup = findDuplicate($pdo, 'account_id', $accountId, $excludeIds, $platform);
        }
        if ($dup) {
            $dups[] = $dup;
        }
    }
    $profileUrl = trim((string)$profileUrl);
    if ($profileUrl !== '') {
        $dup = findDuplicate($pdo, 'profile_url', $profileUrl, $excludeIds);
        if ($dup) {
            $dups[] = $dup;
        }
    }
    return $dups;
}

/**
 * 校验联系方式数组（persons/companies 的 contacts/accounts JSON），返回所有重复项数组（空=无重复）
 * @param PDO $pdo
 * @param array $accounts [{platform,account_id,profile_url,...}]
 * @param array $excludeIds 整表替换时排除自身既有账号ID
 * @return array
 */
function checkAccountsDuplicates(PDO $pdo, $accounts, $excludeIds = [])
{
    $dups = [];
    if (!is_array($accounts)) {
        return $dups;
    }
    foreach ($accounts as $a) {
        if (!is_array($a)) {
            continue;
        }
        $dups = array_merge($dups, checkSingleAccountDuplicate(
            $pdo,
            $a['platform'] ?? '',
            $a['account_id'] ?? '',
            $a['profile_url'] ?? '',
            $excludeIds
        ));
    }
    return $dups;
}