<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

require __DIR__ . '/im_web_bootstrap.php';

$payload = readJsonPayload();
$userId = trim((string)($payload['userId'] ?? $_GET['userId'] ?? ''));
if ($userId === '') {
    respond(400, '缺少用户ID');
}

try {
    $friendResult = requireImSuccess(
        imAdminPost('/admin/friend/list', ['userId' => $userId]),
        '联系人加载失败'
    );
    $friendIds = array_values(array_unique(array_filter(array_map(static function ($uid): string {
        return trim((string)$uid);
    }, $friendResult['list'] ?? []))));
    if (!$friendIds) {
        respond(0, 'success', ['contacts' => []]);
    }

    $usersResult = requireImSuccess(
        imAdminPost('/admin/user/batch_get_infos', ['list' => $friendIds]),
        '联系人资料加载失败'
    );
    try {
        ensureWebImAppTables();
        $remarkMap = fetchWebUserRemarkMap(imAppDb(), $userId, $friendIds);
    } catch (Throwable) {
        $remarkMap = [];
    }
    try {
        $friendAliasMap = fetchImFriendAliasMap(imDb(), $userId, $friendIds);
    } catch (Throwable) {
        $friendAliasMap = [];
    }

    $contactsByUid = [];
    foreach (array_values(array_filter($usersResult['userInfos'] ?? [], 'is_array')) as $user) {
        $uid = (string)($user['userId'] ?? '');
        if ($uid === '' || isset($contactsByUid[$uid])) {
            continue;
        }
        $alias = $friendAliasMap[$uid] ?? '';
        if ($alias === '') {
            $alias = $remarkMap[$uid] ?? '';
        }
        $contactsByUid[$uid] = [
            'uid' => $uid,
            'name' => (string)($user['name'] ?? $uid),
            'displayName' => (string)($user['displayName'] ?? $user['name'] ?? $uid),
            'mobile' => (string)($user['mobile'] ?? ''),
            'portrait' => (string)($user['portrait'] ?? ''),
            'address' => (string)($user['address'] ?? ''),
            'alias' => $alias,
        ];
    }

    respond(0, 'success', ['contacts' => array_values($contactsByUid)]);
} catch (Throwable $error) {
    respond(500, $error->getMessage() ?: '联系人服务暂不可用');
}