<?php

namespace App\Services;

use App\Models\ServerResource;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Http\Client\RequestException;
use Illuminate\Support\Facades\Http;
use Illuminate\Validation\ValidationException;

class ServerUserManagementClient
{
    public function users(ServerResource $server): array
    {
        return $this->request($server, 'get', '/users')->json();
    }

    public function user(ServerResource $server, string $username): array
    {
        return $this->request($server, 'get', '/users/'.$this->encodePath($username))->json();
    }

    public function createUser(ServerResource $server, array $payload): array
    {
        return $this->request($server, 'post', '/users', $payload)->json();
    }

    public function deleteUser(ServerResource $server, string $username): array
    {
        return $this->request($server, 'delete', '/users/'.$this->encodePath($username))->json();
    }

    public function updatePassword(ServerResource $server, string $username, string $passwordHash): array
    {
        return $this->request($server, 'patch', '/users/'.$this->encodePath($username).'/password', [
            'password_hash' => $passwordHash,
        ])->json();
    }

    public function groups(ServerResource $server): array
    {
        return $this->request($server, 'get', '/groups')->json();
    }

    public function createGroup(ServerResource $server, string $groupname): array
    {
        return $this->request($server, 'post', '/groups', ['groupname' => $groupname])->json();
    }

    public function deleteGroup(ServerResource $server, string $groupname): array
    {
        return $this->request($server, 'delete', '/groups/'.$this->encodePath($groupname))->json();
    }

    public function userGroups(ServerResource $server, string $username): array
    {
        return $this->request($server, 'get', '/users/'.$this->encodePath($username).'/groups')->json();
    }

    public function syncUserGroups(ServerResource $server, string $username, array $groups, string $mode = 'replace'): array
    {
        return $this->request($server, 'post', '/users/'.$this->encodePath($username).'/groups', [
            'groups' => array_values($groups),
            'mode' => $mode,
        ])->json();
    }

    public function removeUserGroups(ServerResource $server, string $username, array $groups): array
    {
        return $this->request($server, 'delete', '/users/'.$this->encodePath($username).'/groups', [
            'groups' => array_values($groups),
            'mode' => 'append',
        ])->json();
    }

    private function request(ServerResource $server, string $method, string $path, array $payload = [])
    {
        $target = $this->resolveServer($server);
        $baseUrl = rtrim((string) $target->user_api_base_url, '/');
        $token = trim((string) $target->user_api_token);

        if ($baseUrl === '' || $token === '') {
            throw ValidationException::withMessages([
                'server' => ['该服务器未配置用户管理 API 地址或密钥。'],
            ]);
        }

        try {
            $pending = Http::baseUrl($baseUrl)
                ->acceptJson()
                ->asJson()
                ->timeout((int) config('services.server_user_management.timeout', 15))
                ->connectTimeout((int) config('services.server_user_management.connect_timeout', 5))
                ->retry(2, 200, throw: false)
                ->withToken($token)
                ->withOptions([
                    'verify' => (bool) config('services.server_user_management.verify_ssl', false),
                ]);

            $response = match ($method) {
                'post' => $pending->post($path, $payload),
                'patch' => $pending->patch($path, $payload),
                'delete' => empty($payload) ? $pending->delete($path) : $pending->send('DELETE', $path, ['json' => $payload]),
                default => $pending->get($path),
            };
        } catch (ConnectionException|RequestException $exception) {
            throw ValidationException::withMessages([
                'server' => ['服务器用户管理 API 调用失败：'.$exception->getMessage()],
            ]);
        }

        if (! $response->successful()) {
            $message = (string) (data_get($response->json(), 'message')
                ?: data_get($response->json(), 'detail.message')
                ?: data_get($response->json(), 'detail')
                ?: '服务器用户管理 API 返回异常');

            throw ValidationException::withMessages([
                'server' => [$message],
            ]);
        }

        return $response;
    }

    private function resolveServer(ServerResource $server): ServerResource
    {
        if (! $server->parent_id) {
            return $server;
        }

        return $server->parent()->firstOrFail();
    }

    private function encodePath(string $value): string
    {
        return rawurlencode($value);
    }
}