import {z} from 'zod'

export type GetApiBillingBalanceStatementArgs = {period_start_at: string, period_end_at: string};

export type GetApiBillingBalanceStatementOptions = {baseUrl?: string | undefined, apiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const subscriptionBalanceStatementUsage = z.object({amount_microdollars: z.number().int(), count: z.number().int(), product: z.string()});

export const subscriptionBalanceStatement = z.object({added_microdollars: z.number().int(), ending_balance_microdollars: z.number().int(), expired_microdollars: z.number().int(), other_microdollars: z.number().int(), period_end_at: z.string(), period_start_at: z.string(), refunded_microdollars: z.number().int(), starting_balance_microdollars: z.number().int(), usage: z.array(subscriptionBalanceStatementUsage).nullable()});

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
};

/**
 * Get balance statement
 * 
 * GET /billing/balance/statement
 */
export const getApiBillingBalanceStatement = async (args: GetApiBillingBalanceStatementArgs, options?: GetApiBillingBalanceStatementOptions) => {
const {baseUrl = "https://api.axilio.ai/api/v1", fetch: fetchFn = fetch, apiKeyAuth} = options ?? {}

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

if (args.period_start_at != null) query.append("period_start_at", String(args.period_start_at))
if (args.period_end_at != null) query.append("period_end_at", String(args.period_end_at))
if (apiKeyAuth !== undefined) headers.set("X-Axilio-Api-Key", apiKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/billing/balance/statement${query.size > 0 ? `?${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(subscriptionBalanceStatement, await res.json())
};