import {z} from 'zod'

export type SuggestionType = 'SAVED' | 'TENANT' | 'ASSISTANT' | 'PATIENT' | 'NOTE_TEMPLATE' | 'EVENT';

export type GetApiSuggestionsArgs = {TENANT: string, 'API-KEY': string, suggestion_types: Array<SuggestionType>, patient_id?: (string | null) | undefined, event_id?: (string | null) | undefined};

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

export const suggestionType = z.enum(["SAVED", "TENANT", "ASSISTANT", "PATIENT", "NOTE_TEMPLATE", "EVENT"]);

export const suggestionItem = z.object({id: z.string(), label: z.string(), content: z.string(), type: suggestionType});

export const getApiSuggestionsResponse = z.array(suggestionItem);

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 Suggestions
 * 
 * GET /suggestions
 */
export const getApiSuggestions = async (args: GetApiSuggestionsArgs, options: GetApiSuggestionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.TENANT != null) headers.set("TENANT", String(args.TENANT))
if (args['API-KEY'] != null) headers.set("API-KEY", String(args['API-KEY']))
for (const item of args.suggestion_types ?? []) query.append("suggestion_types", String(item))
if (args.patient_id != null) query.append("patient_id", String(args.patient_id))
if (args.event_id != null) query.append("event_id", String(args.event_id))

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