import {z} from 'zod'

export type GetApiV1BudgetsArgs = {cursor?: (string | null) | undefined, limit?: (number | null) | undefined};

export type GetApiV1BudgetsOptions = {baseUrl?: string | undefined, OAuth2?: string | undefined, fetch?: typeof fetch | undefined};

export const periodType = z.enum(["WEEKLY", "MONTHLY", "QUARTERLY", "YEARLY", "ONE_TIME"]);

export const money = z.object({amount: z.number().int(), currency: z.string().nullable().optional()});

export const budgetStatus = z.enum(["APPROVED", "EXPIRED", "TERMINATED", "DELETED"]);

export const limitType = z.enum(["HARD", "SOFT"]);

export const spendType = z.enum(["BUDGET_PROVISIONED_CARDS_ONLY", "NON_BUDGET_PROVISIONED_CARDS_ALLOWED"]);

export const budgetPeriodBalance = z.object({start_date: z.string().nullable().optional(), end_date: z.string().nullable().optional(), balance: money.nullable().optional()});

export const budget = z.object({budget_id: z.string(), account_id: z.string(), creator_user_id: z.string().nullable().optional(), name: z.string(), description: z.string().nullable().optional(), parent_budget_id: z.string().nullable().optional(), owner_user_ids: z.array(z.string()), member_user_ids: z.array(z.string()), period_type: periodType, start_date: z.string().nullable().optional(), end_date: z.string().nullable().optional(), limit: money.nullable().optional(), budget_status: budgetStatus, limit_type: limitType.nullable().optional(), spend_type: spendType, current_period_balance: budgetPeriodBalance.nullable().optional(), limit_visibility: z.enum(["SHARED", "PRIVATE"]), templateId: z.string().nullable().optional(), budget_type: z.enum(["BUDGET", "SPEND_LIMIT"])});

export const pageBudget = z.object({next_cursor: z.string().nullable().optional(), items: z.array(budget)});

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
};

/**
 * 
 * List Spend Limits
 * 
 * 
 * GET /v1/budgets
 */
export const getApiV1Budgets = async (args: GetApiV1BudgetsArgs, options?: GetApiV1BudgetsOptions) => {
const {baseUrl = "https://api.brex.com", fetch: fetchFn = fetch, OAuth2} = options ?? {}

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

if (args.cursor != null) query.append("cursor", String(args.cursor))
if (args.limit != null) query.append("limit", String(args.limit))
if (OAuth2 !== undefined) headers.set('authorization', `Bearer ${OAuth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/budgets${query.size > 0 ? `?${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(pageBudget, await res.json())
};