import {z} from 'zod'

export type GetApiV2CycleArgs = {limit?: number | undefined, start?: string | undefined, end?: string | undefined, nextToken?: string | undefined};

export type GetApiV2CycleOptions = {baseUrl?: string | undefined, OAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const cycleScore = z.object({strain: z.number(), kilojoule: z.number(), average_heart_rate: z.number().int(), max_heart_rate: z.number().int()});

export const cycle = z.object({id: z.number().int(), user_id: z.number().int(), created_at: z.string(), updated_at: z.string(), start: z.string(), end: z.string().optional(), timezone_offset: z.string(), score_state: z.enum(["SCORED", "PENDING_SCORE", "UNSCORABLE"]), score: cycleScore.optional(), step_count: z.number().int().nullable().optional()});

export const paginatedCycleResponse = z.object({records: z.array(cycle).optional(), next_token: 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
};

/**
 * Get all physiological cycles for a user, paginated. Results are sorted by start time in descending order.
 * 
 * GET /v2/cycle
 */
export const getApiV2Cycle = async (args: GetApiV2CycleArgs, options?: GetApiV2CycleOptions) => {
const {baseUrl = "https://api.prod.whoop.com/developer", fetch: fetchFn = fetch, OAuth} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.start != null) query.append("start", String(args.start))
if (args.end != null) query.append("end", String(args.end))
if (args.nextToken != null) query.append("nextToken", String(args.nextToken))
if (OAuth !== undefined) headers.set('authorization', `Bearer ${OAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/cycle${query.size > 0 ? `?${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(paginatedCycleResponse, await res.json())
};