import {z} from 'zod'

export type GetApi10KbOverdueOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const duration = z.object({unit: z.enum(["DAYS", "WEEKS", "MONTHS", "YEARS", "UNLIMITED"]).optional(), number: z.number().int().optional()});

export const overdueCondition = z.object({timeSinceEarliestUnpaidInvoiceEqualsOrExceeds: duration.optional(), controlTagInclusion: z.enum(["AUTO_PAY_OFF", "AUTO_INVOICING_OFF", "OVERDUE_ENFORCEMENT_OFF", "WRITTEN_OFF", "MANUAL_PAY", "TEST", "PARTNER", "AUTO_INVOICING_DRAFT", "AUTO_INVOICING_REUSE_DRAFT"]).optional(), controlTagExclusion: z.enum(["AUTO_PAY_OFF", "AUTO_INVOICING_OFF", "OVERDUE_ENFORCEMENT_OFF", "WRITTEN_OFF", "MANUAL_PAY", "TEST", "PARTNER", "AUTO_INVOICING_DRAFT", "AUTO_INVOICING_REUSE_DRAFT"]).optional(), numberOfUnpaidInvoicesEqualsOrExceeds: z.number().int().optional(), responseForLastFailedPayment: z.array(z.enum(["INVALID_CARD", "EXPIRED_CARD", "LOST_OR_STOLEN_CARD", "DO_NOT_HONOR", "INSUFFICIENT_FUNDS", "DECLINE", "PROCESSING_ERROR", "INVALID_AMOUNT", "DUPLICATE_TRANSACTION", "OTHER"])).optional(), totalUnpaidInvoiceBalanceEqualsOrExceeds: z.number().optional()});

export const overdueStateConfig = z.object({name: z.string().optional(), isClearState: z.boolean().optional(), condition: overdueCondition.optional(), externalMessage: z.string().optional(), isBlockChanges: z.boolean().optional(), isDisableEntitlement: z.boolean().optional(), subscriptionCancellationPolicy: z.enum(["END_OF_TERM", "IMMEDIATE", "NONE"]).optional(), autoReevaluationIntervalDays: z.number().int().optional()});

export const overdue = z.object({initialReevaluationInterval: z.number().int().optional(), overdueStates: z.array(overdueStateConfig).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 the overdue config as JSON
 * 
 * GET /1.0/kb/overdue
 * 
 * Also accepts auth: Killbill_Api_Key, Killbill_Api_Secret
 */
export const getApi10KbOverdue = async (options: GetApi10KbOverdueOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/1.0/kb/overdue${query.size > 0 ? `?${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(overdue, await res.json())
};