import {z} from 'zod'

export type CreditRequest = {accountId: string, purpose: string, applicableEntityIds?: Array<string> | undefined, effectiveFrom: string, effectiveUntil?: string | undefined, creditAmount?: number | undefined, priority: number, grantorId?: string | undefined, idempotencyKey?: string | undefined};

export type CreateCreditRequest = {creditRequests: Array<CreditRequest>};

export type CreateApiCreditsArgs = {body: CreateCreditRequest};

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

export const credit = z.object({accountId: z.string(), purpose: z.string(), applicableEntityIds: z.array(z.string()).optional(), effectiveFrom: z.string(), effectiveUntil: z.string().optional(), creditAmount: z.number().optional(), priority: z.number().int(), grantorId: z.string().optional(), idempotencyKey: z.string().optional(), id: z.string().max(50), customerId: z.string(), status: z.enum(["ACTIVE", "CONSUMED", "EXPIRED", "VOIDED"]), creditUnit: z.string().optional(), holdAmount: z.number().optional(), consumedAmount: z.number().optional(), createdAt: z.string(), updatedAt: z.string().optional()});

export const createCreditResponse = z.object({credits: z.array(credit)});

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
};

/**
 * Grant credit
 * 
 * POST /credits
 */
export const createApiCredits = async (args: CreateApiCreditsArgs, options?: CreateApiCreditsOptions) => {
const {baseUrl = "https://api.togai.com", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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