/**
 * Payload API Client Singleton
 * Manages single instance of Payload client with proper error handling
 */

import type { PayloadConfig } from './types/config.js';
import { getPayloadConfig } from './types/config.js';

// We'll dynamically import the Payload SDK from the published package
let payloadClient: any = null;

export async function getPayloadClient() {
    if (payloadClient) {
        return payloadClient;
    }

    try {
        const config = getPayloadConfig();

        // Dynamic import of PayloadAPI from published package
        const PayloadModule = await import('@mcp-forge/payload-api') as any;
        const PayloadAPI = PayloadModule.default || PayloadModule;

        payloadClient = new PayloadAPI({
            baseURL: config.baseURL,
            apiToken: config.apiToken,
            timeout: config.timeout,
            maxRetries: config.maxRetries,
        });

        return payloadClient;
    } catch (error: any) {
        throw new Error(
            `Failed to initialize Payload client: ${error.message}. ` +
            `Ensure PAYLOAD_API_URL and PAYLOAD_API_TOKEN are set in your environment.`
        );
    }
}

export async function testConnection(): Promise<boolean> {
    try {
        const client = await getPayloadClient();
        // Simple test - try to get current user or list something
        await client.users.retrieveCurrent();
        return true;
    } catch (error: any) {
        if (error.status === 401) {
            throw new Error(
                'Authentication failed. Check that PAYLOAD_API_TOKEN is valid. ' +
                'Token may have expired or been revoked.'
            );
        }
        throw error;
    }
}