import {z} from 'zod'

export type GetApi30Args = {fields?: Array<string> | undefined, exclude_fields?: Array<string> | undefined};

export type GetApi30Options = {baseUrl?: string | undefined, bearerToken?: string | undefined, fetch?: typeof fetch | undefined};

export const getApi30Response = 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(), account_id: z.string().optional(), account_industry: z.string().optional(), account_name: z.string().optional(), account_timezone: z.string().optional(), avatar_url: z.string().optional(), contact: z.object({addr1: z.string().optional(), addr2: z.string().optional(), city: z.string().optional(), company: z.string().optional(), country: z.string().optional(), state: z.string().optional(), zip: z.string().optional()}).optional(), email: z.string().optional(), first_name: z.string().optional(), first_payment: z.union([z.string(), z.literal("")]).optional(), industry_stats: z.object({bounce_rate: z.number().optional(), click_rate: z.number().optional(), open_rate: z.number().optional()}).optional(), last_login: z.string().optional(), last_name: z.string().optional(), login_id: z.string().optional(), member_since: z.string().optional(), pricing_plan_type: z.enum(["monthly", "pay_as_you_go", "forever_free"]).optional(), pro_enabled: z.boolean().optional(), role: z.string().optional(), total_subscribers: z.number().int().optional(), username: z.string().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
};

/**
 * List API root resources
 * 
 * GET /3.0/
 * 
 * Also accepts auth: oauth2
 */
export const getApi30 = async (args: GetApi30Args, options?: GetApi30Options) => {
const {baseUrl = "https://api.mailchimp.com", fetch: fetchFn = fetch, bearerToken} = options ?? {}

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

if (args.fields != null) query.append("fields", args.fields.join(','))
if (args.exclude_fields != null) query.append("exclude_fields", args.exclude_fields.join(','))
if (bearerToken !== undefined) headers.set('authorization', `Bearer ${bearerToken}`)

const url = `${baseUrl.replace(/\/+$/, '')}/3.0/${query.size > 0 ? `?${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(getApi30Response, await res.json())
};