import { packageStorage } from 'kody:runtime'
import {
	DEFAULT_API_VERSION_KEY,
	DEFAULT_SHOP_KEY,
} from './lib/client.ts'
import {
	DEFAULT_API_VERSION,
	normalizeShop,
	resolveApiVersion,
} from './lib/shop.ts'

export type ShopifyConfig = {
	defaultShop: string | null
	defaultApiVersion: string
	note: string
}

async function readString(key: string): Promise<string | null> {
	const store = packageStorage()
	const raw = await store.get(key)
	return typeof raw === 'string' && raw.trim() ? raw.trim() : null
}

/**
 * Read fork-local defaults from `packageStorage()`.
 *
 * Live `@kody/shopify` storage is the platform package bucket, not yours.
 * Fork first (or `packages.invoke` your copy) before relying on these defaults.
 *
 * @example
 * import { getConfig } from 'kody:@kody/shopify/config'
 * const config = await getConfig()
 */
export async function getConfig(): Promise<ShopifyConfig> {
	const defaultShop = await readString(DEFAULT_SHOP_KEY)
	const storedVersion = await readString(DEFAULT_API_VERSION_KEY)
	return {
		defaultShop: defaultShop ? normalizeShop(defaultShop) : null,
		defaultApiVersion: resolveApiVersion(
			storedVersion || DEFAULT_API_VERSION,
		),
		note: 'These defaults live in this package\'s packageStorage. Fork or invoke your own copy before setting them.',
	}
}

/**
 * Persist a default shop handle for later calls that omit `shop`.
 */
export async function setDefaultShop(params: { shop: string }) {
	const shop = normalizeShop(params.shop)
	const store = packageStorage()
	await store.set(DEFAULT_SHOP_KEY, shop)
	return { defaultShop: shop }
}

/**
 * Persist a default Admin API version (`YYYY-MM`).
 */
export async function setDefaultApiVersion(params: { apiVersion: string }) {
	const apiVersion = resolveApiVersion(params.apiVersion)
	const store = packageStorage()
	await store.set(DEFAULT_API_VERSION_KEY, apiVersion)
	return { defaultApiVersion: apiVersion }
}

/**
 * Clear stored shop and API version defaults.
 */
export async function clearConfig() {
	const store = packageStorage()
	await store.set(DEFAULT_SHOP_KEY, '')
	await store.set(DEFAULT_API_VERSION_KEY, '')
	return { cleared: true }
}

/** Default export: read config. */
export default getConfig