/**
 * Transak API utilities — shared across rFlows and rCart.
 *
 * Builds Transak widget URLs using direct query parameters.
 * The gateway session API has auth issues, so we use the direct
 * URL approach which Transak still supports.
 *
 * Environment: TRANSAK_ENV controls staging vs production.
 * API keys are split: TRANSAK_API_KEY_STAGING / TRANSAK_API_KEY_PRODUCTION
 * (falls back to legacy TRANSAK_API_KEY if per-env keys aren't set).
 */

const TRANSAK_WIDGET_BASE = 'https://global.transak.com';
const TRANSAK_WIDGET_BASE_STG = 'https://global-stg.transak.com';

export type TransakEnv = 'STAGING' | 'PRODUCTION';

/** Get the current Transak environment */
export function getTransakEnv(): TransakEnv {
	return (process.env.TRANSAK_ENV as TransakEnv) || 'STAGING';
}

/** Get the API key for the current Transak environment */
export function getTransakApiKey(): string {
	const env = getTransakEnv();
	return (env === 'PRODUCTION'
		? process.env.TRANSAK_API_KEY_PRODUCTION
		: process.env.TRANSAK_API_KEY_STAGING
	) || process.env.TRANSAK_API_KEY || '';
}

/** Get the webhook secret for the current Transak environment */
export function getTransakWebhookSecret(): string {
	const env = getTransakEnv();
	return (env === 'PRODUCTION'
		? process.env.TRANSAK_WEBHOOK_SECRET_PRODUCTION
		: process.env.TRANSAK_WEBHOOK_SECRET_STAGING
	) || process.env.TRANSAK_WEBHOOK_SECRET || '';
}

/** Extract root domain from a hostname (e.g. "demo.rspace.online" → "rspace.online") */
export function extractRootDomain(host: string): string {
	const parts = host.replace(/:\d+$/, '').split('.');
	return parts.length > 2 ? parts.slice(-2).join('.') : parts.join('.');
}

export function createTransakWidgetUrl(params: Record<string, string>): string {
	const env = getTransakEnv();
	const base = env === 'PRODUCTION' ? TRANSAK_WIDGET_BASE : TRANSAK_WIDGET_BASE_STG;

	const url = new URL(base);
	for (const [key, value] of Object.entries(params)) {
		if (value != null && value !== '') {
			url.searchParams.set(key, value);
		}
	}

	return url.toString();
}