import {z} from 'zod'

export type GetApiPaymentsBillingArgs = {'x-api-key'?: string | undefined, 'lmnt-auth0'?: (string | null) | undefined};

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

export const scheduledChange = z.object({price_id: z.string(), plan_name: z.string().nullable().optional(), effective_at: z.number().int()});

export const subscriptionResponse = z.object({price_id: z.string().nullable().optional(), status: z.string().nullable().optional(), current_period_end: z.number().int().nullable().optional(), cancel_at_period_end: z.boolean().optional(), scheduled_change: scheduledChange.nullable().optional()});

export const paymentMethodResponse = z.object({brand: z.string(), last4: z.string()});

export const invoiceItem = z.object({id: z.string(), number: z.string().nullable().optional(), amount_paid: z.number().int(), currency: z.string(), status: z.string().nullable().optional(), created: z.number().int(), hosted_invoice_url: z.string().nullable().optional(), invoice_pdf: z.string().nullable().optional()});

export const billingOverviewResponse = z.object({subscription: subscriptionResponse, payment_method: paymentMethodResponse.nullable().optional(), invoices: z.array(invoiceItem).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
};

/**
 * Billing Overview Handler
 * 
 * GET /payments/billing
 */
export const getApiPaymentsBilling = async (args: GetApiPaymentsBillingArgs, options: GetApiPaymentsBillingOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
const cookies: string[] = []
headers.set('accept', "application/json")

if (args['x-api-key'] != null) headers.set("x-api-key", String(args['x-api-key']))
if (args['lmnt-auth0'] != null) cookies.push("lmnt-auth0=" + encodeURIComponent(String(args['lmnt-auth0'])))
if (cookies.length > 0) headers.set('cookie', cookies.join('; '))

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