import {z} from 'zod'

export type CreateApi30BatchesArgs = {body: {operations: Array<{body?: string | undefined, headers?: Record<string, never> | undefined, method: 'GET' | 'get' | 'POST' | 'post' | 'PUT' | 'put' | 'PATCH' | 'patch' | 'DELETE' | 'delete', operation_id?: string | undefined, params?: Record<string, never> | undefined, path: string}>}};

export type CreateApi30BatchesOptions = {baseUrl?: string | undefined, bearerToken?: string | undefined, fetch?: typeof fetch | undefined};

export const createApi30BatchesResponse = z.object({_links: z.array(z.object({href: z.string().optional(), method: z.enum(["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS", "HEAD"]).optional(), rel: z.string().optional(), schema: z.string().optional(), targetSchema: z.string().optional()})).optional(), completed_at: z.union([z.string(), z.literal("")]).optional(), errored_operations: z.number().int().optional(), finished_operations: z.number().int().optional(), id: z.string().optional(), response_body_url: z.string().optional(), status: z.enum(["pending", "preprocessing", "started", "finalizing", "finished"]).optional(), submitted_at: z.string().optional(), total_operations: z.number().int().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
};

/**
 * Start batch operation
 * 
 * POST /3.0/batches
 * 
 * Also accepts auth: oauth2
 */
export const createApi30Batches = async (args: CreateApi30BatchesArgs, options?: CreateApi30BatchesOptions) => {
const {baseUrl = "https://api.mailchimp.com", fetch: fetchFn = fetch, bearerToken} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/3.0/batches${query.size > 0 ? `?${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(createApi30BatchesResponse, await res.json())
};