import {z} from 'zod'

export type GetApiContractsContractIdPredictionFlagsArgs = {'contract-id': string};

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

export const predictionFlag = z.object({label_id: z.number().optional(), label_display: z.string().optional(), confidence: z.number().optional(), defined_term: z.string().optional(), citation: z.string().optional(), source_language: z.string().optional(), selected: z.number().optional()});

export const predictionFlagsDetail = z.object({name: z.string().optional(), flag_count: z.number().optional(), flags: z.array(predictionFlag).optional()});

export const predictionFlags = z.object({contract_id: z.string().optional(), details: z.array(predictionFlagsDetail).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
};

/**
 * Predicted red flags
 * 
 * GET /contracts/{contract-id}/prediction-flags
 * 
 * Also accepts auth: api_key
 */
export const getApiContractsContractIdPredictionFlags = async (args: GetApiContractsContractIdPredictionFlagsArgs, options?: GetApiContractsContractIdPredictionFlagsOptions) => {
const {baseUrl = "https://api.termscout.com", fetch: fetchFn = fetch, lambdaApiAuthorizer} = options ?? {}

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

if (lambdaApiAuthorizer !== undefined) headers.set("Authorization", lambdaApiAuthorizer)

const url = `${baseUrl.replace(/\/+$/, '')}/contracts/${encodeURIComponent(String(args['contract-id']))}/prediction-flags${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(predictionFlags, await res.json())
};