<?php

namespace Modules\EcommerceFinance\Services;

use InvalidArgumentException;

/**
 * 统一解析上游数据源定义，避免业务代码直接拼接配置路径。
 */
class UpstreamSourceRegistry
{
    public function __construct(
        private readonly UpstreamStoredConfiguration $storedConfiguration,
    ) {
    }

    /**
     * @return array{key:string,label:string,config:string}
     */
    public function definition(string $source): array
    {
        $source = strtolower(trim($source));

        if ($source === '' || ! preg_match('/^[a-z0-9_-]+$/', $source)) {
            throw new InvalidArgumentException('上游数据源标识不合法。');
        }

        $definition = config('upstreams.sources.' . $source);

        if (! is_array($definition)) {
            throw new InvalidArgumentException('未登记的上游数据源：' . $source);
        }

        $configKey = trim((string) ($definition['config'] ?? ''));

        if ($configKey === '' || ! preg_match('/^[a-z0-9_.-]+$/i', $configKey)) {
            throw new InvalidArgumentException('上游数据源配置路径不合法：' . $source);
        }

        return [
            'key' => $source,
            'label' => trim((string) ($definition['label'] ?? $source)) ?: $source,
            'config' => $configKey,
        ];
    }

    public function value(string $source, string $path, mixed $default = null): mixed
    {
        $definition = $this->definition($source);
        $suffix = trim($path, '.');
        $key = $definition['config'] . ($suffix === '' ? '' : '.' . $suffix);
        $configured = config($key, $default);

        if ($this->usesLocalConfiguration()) {
            return $configured;
        }

        if ($suffix === 'connection') {
            return $this->connection($definition['key'], (array) $configured);
        }

        // Hosts and credentials come from the shared record, while the ODBC
        // driver must match the operating system that runs this application.
        if ($suffix === 'connection.odbc_driver' && trim((string) $configured) !== '') {
            return $configured;
        }

        return $this->storedConfiguration->value($definition['key'], $suffix, $configured);
    }

    public function enabled(string $source): bool
    {
        return (bool) $this->value($source, 'enabled', false);
    }

    private function usesLocalConfiguration(): bool
    {
        return (bool) config('upstreams.local_configuration.enabled', false);
    }

    private function connection(string $source, array $configured): array
    {
        $fields = array_values(array_unique(array_merge(array_keys($configured), [
            'host',
            'port',
            'database',
            'username',
            'password',
            'odbc_driver',
            'tds_version',
            'connect_timeout',
            'query_timeout',
        ])));
        $resolved = $configured;

        foreach ($fields as $field) {
            $resolved[$field] = $this->value(
                $source,
                'connection.' . $field,
                $configured[$field] ?? null,
            );
        }

        return $resolved;
    }
}