import {z} from 'zod'

export type GetApiV0ScheduleArgs = {start: string, end: string, questionnaire: string, state: string, duration?: number | undefined};

export type GetApiV0ScheduleOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const model10 = z.object({start: z.string(), end: z.string()});

export const availabilities = z.array(model10);

export const model11 = z.object({availabilities: availabilities.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
};

/**
 * Return available open slots for any provider that can be used to create consults and schedule appointments on these slots.
 * 
 * GET /v0/schedule
 */
export const getApiV0Schedule = async (args: GetApiV0ScheduleArgs, options?: GetApiV0ScheduleOptions) => {
const {baseUrl = "https://api.truepill.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.start != null) query.append("start", String(args.start))
if (args.end != null) query.append("end", String(args.end))
if (args.questionnaire != null) query.append("questionnaire", String(args.questionnaire))
if (args.state != null) query.append("state", String(args.state))
if (args.duration != null) query.append("duration", String(args.duration))
if (apiKey !== undefined) headers.set("Authorization", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v0/schedule${query.size > 0 ? `?${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(model11, await res.json())
};