import {z} from 'zod'

export type LedgerId = string;

export type BillingInterval = 'month' | 'quarter' | 'year' | 'one_time' | 'contract_term';

export type UnixTimestamp = number;

export type Properties = unknown;

export type ContractRequest = {account_id: LedgerId, customer_id: string, stripe_customer_id?: (string | null) | undefined, currency_code: string, billing_interval: BillingInterval, starts_at: UnixTimestamp, ends_at?: (UnixTimestamp | null) | undefined, payment_terms?: (string | null) | undefined, metadata?: Properties | undefined};

export type CreateApiV2ContractsArgs = {body: ContractRequest};

export type CreateApiV2ContractsOptions = {baseUrl: string, LedgerUpApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const ledgerId = z.string();

export const contractStatus = z.enum(["draft", "active", "canceled", "expired"]);

export const billingInterval = z.enum(["month", "quarter", "year", "one_time", "contract_term"]);

export const unixTimestamp = z.number().int();

export const properties = z.unknown();

export const contract = z.object({id: ledgerId, account_id: ledgerId, customer_id: z.string(), stripe_customer_id: z.string().nullable(), status: contractStatus, currency_code: z.string(), billing_interval: billingInterval, starts_at: unixTimestamp, ends_at: unixTimestamp.nullable(), payment_terms: z.string().nullable(), metadata: properties, created_at: unixTimestamp, updated_at: unixTimestamp, canceled_at: unixTimestamp.nullable(), cancel_at: unixTimestamp.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
};

/**
 * Create a contract.
 * 
 * POST /v2/contracts
 */
export const createApiV2Contracts = async (args: CreateApiV2ContractsArgs, options: CreateApiV2ContractsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, LedgerUpApiKey} = options ?? {}

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

if (LedgerUpApiKey !== undefined) headers.set("x-api-key", LedgerUpApiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/contracts${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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