import {z} from 'zod'

export type GetApiApiV1EngineFieldsPreTrainedFieldsArgs = {engine_use_case?: ('generic_ap' | 'coupa_line_level' | 'coupa_header_level') | undefined};

export type GetApiApiV1EngineFieldsPreTrainedFieldsOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const preTrainedField = z.object({name: z.string().optional(), label: z.string().optional(), section: z.string().optional(), type: z.enum(["string", "number", "date", "enum"]).optional(), subtype: z.string().nullable().optional(), tabular: z.boolean().optional(), multiline: z.enum(["true", "false"]).optional(), description: z.string().optional()});

export const getApiApiV1EngineFieldsPreTrainedFieldsResponse = z.object({results: z.array(preTrainedField).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
};

/**
 * List pre-trained fields
 * 
 * GET /api/v1/engine_fields/pre_trained_fields
 */
export const getApiApiV1EngineFieldsPreTrainedFields = async (args: GetApiApiV1EngineFieldsPreTrainedFieldsArgs, options?: GetApiApiV1EngineFieldsPreTrainedFieldsOptions) => {
const {baseUrl = "https://example.rossum.app", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/engine_fields/pre_trained_fields${query.size > 0 ? `?${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(getApiApiV1EngineFieldsPreTrainedFieldsResponse, await res.json())
};