<?php

declare(strict_types=1);

namespace app\miniapi\service;

use app\miniapi\auth\Principal;
use app\miniapi\exception\ApiException;
use app\miniapi\model\MiniUser;
use app\miniapi\model\MiniCommand;
use app\miniapi\model\MiniAudit;

/** A user row serializes retries; business writes and the response commit together. */
final class Commands
{
    public static function run(Principal $actor, string $key, string $action, array $payload, callable $operation, callable $authorize): array
    {
        if (!preg_match('/^[A-Za-z0-9_-]{8,80}$/D', $key)) {
            throw new ApiException(42201, 'request_key须为8至80位字母、数字、下划线或短横线', 422);
        }
        $normalize = function ($value) use (&$normalize) {
            if (!is_array($value)) {
                return $value;
            }
            if (!array_is_list($value)) {
                ksort($value);
            }

            return array_map($normalize, $value);
        };
        $hash = hash('sha256', json_encode($normalize($payload), JSON_THROW_ON_ERROR));

        return (new MiniUser())->getConnection()->transaction(function () use ($actor, $key, $action, $operation, $authorize, $hash) {
            $user = MiniUser::query()->where('id', $actor->userId)->lockForUpdate()->first();
            if (!$user || (int) $user->status !== 1) {
                throw new ApiException(40101, '登录状态已失效', 401);
            }
            // Grant changes use the same user lock. Replays must also retain current permission.
            $authorize();
            $old = MiniCommand::query()->where([
                'user_id' => $actor->userId,
                'request_key' => $key,
            ])->first();
            if ($old) {
                if ($old->action !== $action || !hash_equals($old->payload_hash, $hash)) {
                    throw new ApiException(40901, '重复请求的内容发生变化', 409);
                }

                return json_decode($old->result, true, 512, JSON_THROW_ON_ERROR) + ['replayed' => true];
            }
            try {
                $result = $operation();
            } catch (\plugin\saiadmin\exception\ApiException $e) {
                throw new ApiException(40902, $e->getMessage(), 409);
            }
            MiniCommand::query()->insert([
                'user_id' => $actor->userId,
                'request_key' => $key,
                'action' => $action,
                'payload_hash' => $hash,
                'result' => json_encode($result, JSON_THROW_ON_ERROR),
                'created_at' => date('Y-m-d H:i:s'),
            ]);
            self::audit('mini', (int) $actor->userId, $action, (int) ($result['id'] ?? 0), [
                'request_key' => $key,
                'payload_hash' => $hash,
            ]);

            return $result;
        });
    }

    public static function audit(string $type, int $actor, string $action, int $resource, array $data): void
    {
        MiniAudit::query()->insert([
            'actor_type' => $type,
            'actor_id' => $actor,
            'action' => $action,
            'resource_id' => $resource,
            'data' => json_encode($data, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR),
            'created_at' => date('Y-m-d H:i:s'),
        ]);
    }
}