import {z} from 'zod'

export type GetApiV4FormsMetadataArgs = {continuationToken?: string | undefined, size?: number | undefined, type?: ('additional' | 'initial' | 'reference' | 'review' | 'internal' | 'eligibility' | 'request') | undefined, projectId?: string | undefined};

export type GetApiV4FormsMetadataOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const formMetadataResponse = z.object({formId: z.string().nullable().optional(), name: z.string().nullable().optional(), formType: z.enum(["additional", "initial", "reference", "review", "internal", "eligibility", "request"]).nullable().optional(), createdBy: z.string().optional(), createdAt: z.string().nullable().optional(), updatedBy: z.string().optional(), updatedAt: z.string().nullable().optional()});

export const continuationTokenResponseFormMetadataResponse = z.object({continuationToken: z.string().nullable().optional(), items: z.array(formMetadataResponse).nullable().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
};

/**
 * Get a page of form metadata
 * 
 * GET /v4/forms/metadata
 */
export const getApiV4FormsMetadata = async (args: GetApiV4FormsMetadataArgs, options?: GetApiV4FormsMetadataOptions) => {
const {baseUrl = "https://submittable-api.submittable.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.continuationToken != null) query.append("continuationToken", String(args.continuationToken))
if (args.size != null) query.append("size", String(args.size))
if (args.type != null) query.append("type", String(args.type))
if (args.projectId != null) query.append("projectId", String(args.projectId))

const url = `${baseUrl.replace(/\/+$/, '')}/v4/forms/metadata${query.size > 0 ? `?${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(continuationTokenResponseFormMetadataResponse, await res.json())
};