import {z} from 'zod'

export type GetApi10KbUsagesSubscriptionIdArgs = {subscriptionId: string, startDate?: string | undefined, endDate?: string | undefined};

export type GetApi10KbUsagesSubscriptionIdOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const rolledUpUnit = z.object({unitType: z.string().optional(), amount: z.number().int().optional()});

export const rolledUpUsage = z.object({subscriptionId: z.string().optional(), startDate: z.string().optional(), endDate: z.string().optional(), rolledUpUnits: z.array(rolledUpUnit).optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Retrieve usage for a subscription
 * 
 * GET /1.0/kb/usages/{subscriptionId}
 * 
 * Also accepts auth: Killbill_Api_Key, Killbill_Api_Secret
 */
export const getApi10KbUsagesSubscriptionId = async (args: GetApi10KbUsagesSubscriptionIdArgs, options: GetApi10KbUsagesSubscriptionIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.startDate != null) query.append("startDate", String(args.startDate))
if (args.endDate != null) query.append("endDate", String(args.endDate))
if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/1.0/kb/usages/${encodeURIComponent(String(args.subscriptionId))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(rolledUpUsage, await res.json())
};