<?php

namespace Modules\EcommerceFinance\Services;

use App\Models\Settings\DatabaseConnection;
use Illuminate\Support\Facades\Schema;

/**
 * 从系统数据库读取可由同一套系统数据库凭据解锁的上游连接配置。
 *
 * 本地、开发和测试环境保持可用；生产环境必须通过私有环境变量显式开启。
 */
class UpstreamStoredConfiguration
{
    public const SYSTEM_COMPANY_ID = 0;

    /** @var array<string, DatabaseConnection|null> */
    private array $connections = [];

    public function editable(): bool
    {
        return app()->environment(['local', 'development', 'testing'])
            || (bool) config('upstreams.stored_configuration.enabled', false);
    }

    public function enabled(): bool
    {
        return (bool) config('upstreams.stored_configuration.enabled', false);
    }

    public function find(string $source): ?DatabaseConnection
    {
        if (! $this->enabled()) {
            return null;
        }

        if (array_key_exists($source, $this->connections)) {
            return $this->connections[$source];
        }

        if (! Schema::hasTable('system_database_connections')) {
            return $this->connections[$source] = null;
        }

        $this->connections[$source] = DatabaseConnection::query()
            ->where('company_id', self::SYSTEM_COMPANY_ID)
            ->where('source_key', $source)
            ->first();

        return $this->connections[$source];
    }

    public function forget(string $source): void
    {
        unset($this->connections[$source]);
    }

    public function value(string $source, string $path, mixed $default = null): mixed
    {
        $connection = $this->find($source);

        if (! $connection) {
            return $default;
        }

        return match (trim($path, '.')) {
            'enabled' => $connection->enabled,
            'allowed_scopes' => $connection->allowed_scopes ?? [],
            'connection' => $this->connection($connection, $default),
            'connection.host' => $connection->host,
            'connection.port' => $connection->port,
            'connection.database' => $connection->database_name,
            'connection.username' => $connection->username,
            'connection.password' => $this->password($connection, $default),
            'connection.odbc_driver' => $connection->odbc_driver,
            'connection.tds_version' => $connection->tds_version,
            'connection.connect_timeout' => $connection->connect_timeout,
            'connection.query_timeout' => $connection->query_timeout,
            default => $default,
        };
    }

    private function connection(DatabaseConnection $connection, mixed $default): array
    {
        $configured = is_array($default) ? $default : [];

        return array_replace($configured, [
            'host' => $connection->host,
            'port' => $connection->port,
            'database' => $connection->database_name,
            'username' => $connection->username,
            'password' => $this->password($connection, $configured['password'] ?? null),
            'odbc_driver' => $connection->odbc_driver,
            'tds_version' => $connection->tds_version,
            'connect_timeout' => $connection->connect_timeout,
            'query_timeout' => $connection->query_timeout,
        ]);
    }

    private function password(DatabaseConnection $connection, mixed $_localPassword): mixed
    {
        return $connection->resolvedPassword();
    }
}