import {z} from 'zod'

export type MetricType = 'METERED' | 'RECURRING';

export type MetricAggregationType = 'COUNT' | 'SUM' | 'MAX' | 'COUNT_DISTINCT' | 'LATEST' | null;

export type MetricRequest = {name?: string | undefined, code?: string | undefined, type?: MetricType | undefined, description?: string | undefined, aggregation_type?: MetricAggregationType | undefined, aggregation_field?: string | undefined, field_filters?: Array<{key: string, values: Array<string>}> | undefined};

export type CreateApiMetricsArgs = {body: MetricRequest};

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

export const metricType = z.enum(["METERED", "RECURRING"]);

export const metricAggregationType = z.enum(["COUNT", "SUM", "MAX", "COUNT_DISTINCT", "LATEST"]).nullable();

export const dateTimeWithZone = z.string();

export const metricResponse = z.object({name: z.string(), code: z.string(), type: metricType.optional(), description: z.string().optional(), aggregation_type: metricAggregationType, aggregation_field: z.string().optional(), field_filters: z.array(z.object({key: z.string(), values: z.array(z.string())})).optional(), id: z.string(), created_at: dateTimeWithZone, updated_at: dateTimeWithZone.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
};

/**
 * Create a new metric
 * 
 * POST /metrics
 */
export const createApiMetrics = async (args: CreateApiMetricsArgs, options?: CreateApiMetricsOptions) => {
const {baseUrl = "https://api-m.sandbox.paypal.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 = `${baseUrl.replace(/\/+$/, '')}/metrics${query.size > 0 ? `?${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(metricResponse, await res.json())
};