import {z} from 'zod'

export type GetApiEventsArgs = {page?: number | undefined, per_page?: number | undefined, external_subscription_id?: string | undefined, metric_code?: string | undefined, from_date?: string | undefined, to_date?: string | undefined};

export type GetApiEventsOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const dateTimeWithZone = z.string();

export const eventResponse = z.object({transaction_id: z.string(), external_subscription_id: z.string(), metric_code: z.string(), timestamp: dateTimeWithZone.optional(), properties: z.object({}).optional(), id: z.string().optional(), created_at: dateTimeWithZone.optional()});

export const paginationMetadata = z.object({total_count: z.number().int().optional(), total_pages: z.number().int().optional(), current_page: z.number().int().optional()});

export const getApiEventsResponse = z.object({events: z.array(eventResponse).optional(), metadata: paginationMetadata.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
};

/**
 * Query usage events
 * 
 * GET /events
 */
export const getApiEvents = async (args: GetApiEventsArgs, options?: GetApiEventsOptions) => {
const {baseUrl = "https://api-m.sandbox.paypal.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.per_page != null) query.append("per_page", String(args.per_page))
if (args.external_subscription_id != null) query.append("external_subscription_id", String(args.external_subscription_id))
if (args.metric_code != null) query.append("metric_code", String(args.metric_code))
if (args.from_date != null) query.append("from_date", String(args.from_date))
if (args.to_date != null) query.append("to_date", String(args.to_date))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

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