import {z} from 'zod'

export type GetApiFormsFormIdStructureArgs = {TENANT: string, 'API-KEY': string, form_id: string};

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

export const questionType = z.enum(["ADDRESS", "DATE", "TEXT", "NUMBER", "TEXT_AREA", "SINGLE_SELECT", "RADIAL_SINGLE_SELECT", "MULTI_SELECT", "RADIAL_MULTI_SELECT", "TOGGLE", "SIGNATURE", "FILE_UPLOAD", "PHONE_NUMBER", "EMAIL", "PAYMENT_METHOD", "TAG", "DISCLAIMER", "STATEMENT", "DOCUMENT", "FEET_INCHES_HEIGHT", "POUNDS_WEIGHT", "CALCULATED_SCORE"]);

export const questionSummary = z.object({id: z.string(), questionType: questionType, name: z.string(), isArchived: z.boolean()});

export const blockStructure = z.object({name: z.string(), questions: z.array(questionSummary), isArchived: z.boolean(), position: z.number().int()});

export const formStructure = z.object({id: z.string(), name: z.string(), blocks: z.array(blockStructure)});

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 Form Structure
 * 
 * GET /forms/{form_id}/structure
 */
export const getApiFormsFormIdStructure = async (args: GetApiFormsFormIdStructureArgs, options: GetApiFormsFormIdStructureOptions) => {
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']))

const url = `${baseUrl.replace(/\/+$/, '')}/forms/${encodeURIComponent(String(args.form_id))}/structure${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(formStructure, await res.json())
};