import {z} from 'zod'

export type GetApiSitesArgs = {date_range?: string | undefined};

export type GetApiSitesOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const siteStats = z.object({date_range: z.string().optional(), metrics: z.record(z.string(), z.number()).optional()});

export const siteSummary = z.object({site_id: z.number().int(), name: z.string(), hash: z.string(), timezone: z.string(), hobby: z.boolean(), stats_start_date: z.string().nullable().optional(), created_at: z.string().optional(), stats: siteStats.optional()});

export const sitesResponse = z.object({sites: z.array(siteSummary)});

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 the sites this key can read
 * 
 * GET /sites
 */
export const getApiSites = async (args: GetApiSitesArgs, options?: GetApiSitesOptions) => {
const {baseUrl = "https://statable.com/api/v1", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.date_range != null) query.append("date_range", String(args.date_range))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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