<?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'] ?? ''));
$keyword = trim((string)($payload['keyword'] ?? ''));
$reason = trim((string)($payload['reason'] ?? '添加联系人'));

if ($userId === '') {
    respond(400, '缺少当前用户ID');
}

if ($keyword === '') {
    respond(400, '请输入要添加的联系人');
}

function tryImUserInfo(array $payload): ?array
{
    try {
        $result = requireImSuccess(imAdminPost('/admin/user/get_info', $payload), '用户查询失败');
        return $result ?: null;
    } catch (Throwable $error) {
        return null;
    }
}

function normalizeUserInfo(array $user): array
{
    $uid = (string)($user['userId'] ?? $user['uid'] ?? '');
    return [
        'uid' => $uid,
        'name' => (string)($user['name'] ?? $uid),
        'displayName' => (string)($user['displayName'] ?? $user['name'] ?? $uid),
        'mobile' => (string)($user['mobile'] ?? ''),
        'portrait' => (string)($user['portrait'] ?? ''),
        'alias' => '',
    ];
}

try {
    $target = tryImUserInfo(['userId' => $keyword]);
    if (!$target && preg_match('/^\+?\d{5,32}$/', $keyword)) {
        $target = tryImUserInfo(['mobile' => $keyword]);
    }
    if (!$target) {
        $target = tryImUserInfo(['name' => $keyword]);
    }

    if (!$target) {
        respond(404, '没有找到该用户');
    }

    $contact = normalizeUserInfo($target);
    if ($contact['uid'] === '') {
        respond(404, '没有找到该用户');
    }
    if ($contact['uid'] === $userId) {
        respond(400, '不能添加自己为联系人');
    }

    $friendResult = requireImSuccess(
        imAdminPost('/admin/friend/list', ['userId' => $userId]),
        '好友列表检查失败'
    );
    $friendIds = array_values(array_filter($friendResult['list'] ?? [], 'is_string'));
    if (in_array($contact['uid'], $friendIds, true)) {
        respond(409, '该用户已经是联系人', ['contact' => $contact]);
    }

    requireImSuccess(
        imAdminPost('/admin/friend/status', [
            'userId' => $userId,
            'friendUid' => $contact['uid'],
            'status' => 0,
        ]),
        '添加联系人失败'
    );
    requireImSuccess(
        imAdminPost('/admin/friend/status', [
            'userId' => $contact['uid'],
            'friendUid' => $userId,
            'status' => 0,
        ]),
        '添加联系人失败'
    );

    respond(0, 'success', ['contact' => $contact, 'reason' => $reason]);
} catch (Throwable $error) {
    respond(500, $error->getMessage() ?: '添加联系人服务暂不可用');
}