import {z} from 'zod'

export type LocaleCode = string;

export type GetApiDemandIntelligentCalendarSuggestTimeRangeArgs = {days?: number | undefined, start?: string | undefined, end?: string | undefined, locale: LocaleCode};

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

export const suggestedTimeRangeResponse = z.object({suggested_start: z.string().optional(), suggested_end: z.string().optional(), holidays: z.array(z.object({date: z.string().optional(), name: z.string().optional(), respondent_rate: z.number().optional(), completes_rate: z.number().optional()})).optional(), timezone: 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
};

/**
 * Suggests an optimal fielding time range for a locale
 * 
 * GET /demand/intelligent-calendar/suggest-time-range
 */
export const getApiDemandIntelligentCalendarSuggestTimeRange = async (args: GetApiDemandIntelligentCalendarSuggestTimeRangeArgs, options?: GetApiDemandIntelligentCalendarSuggestTimeRangeOptions) => {
const {baseUrl = "https://api.cint.com/v1", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/demand/intelligent-calendar/suggest-time-range${query.size > 0 ? `?${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(suggestedTimeRangeResponse, await res.json())
};