import {z} from 'zod'

export type AssertionAssertionType = 'ASSERTION_TYPE_UNSPECIFIED' | 'ASSERTION_TYPE_LLM' | 'ASSERTION_TYPE_CODE';

export type GatewayProvider = {id?: string | undefined, config?: {[key: string]: string} | undefined, label?: string | undefined};

export type GatewayEvaluateOptions = {maxConcurrency?: number | undefined, repeat?: number | undefined, delay?: number | undefined};

export type GatewayLLMAssertion = {llmEvaluatorPrompt?: string | undefined, providers: Array<GatewayProvider>, prompts: Array<string>, evaluateOptions?: GatewayEvaluateOptions | undefined};

export type CodeAssertionExecutionOptions = {timeoutMs?: number | undefined, memoryLimitMb?: number | undefined, envVars?: {[key: string]: string} | undefined};

export type GatewayCodeAssertion = {language: string, code: string, expectedOutput?: string | undefined, options?: CodeAssertionExecutionOptions | undefined};

export type GatewayAssertion = {assertionType: AssertionAssertionType, llmAssertion?: GatewayLLMAssertion | undefined, codeAssertion?: GatewayCodeAssertion | undefined, metricName?: string | undefined};

export type GatewayGatewayValidateAssertionsBody = {assertions: Array<GatewayAssertion>};

export type CreateApiV1AccountsAccountIdEvaluationsValidateAssertionsArgs = {account_id: string, body: GatewayGatewayValidateAssertionsBody};

export type CreateApiV1AccountsAccountIdEvaluationsValidateAssertionsOptions = {baseUrl: string, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const validateAssertionsResponseValidateAssertionError = z.object({errorMessages: z.array(z.string()).optional()});

export const gatewayValidateAssertionsResponse = z.object({status: z.string().optional(), metricToErrors: z.record(z.string(), validateAssertionsResponseValidateAssertionError).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
};

/**
 * Validate evaluation assertions
 * 
 * POST /v1/accounts/{account_id}/evaluations:validateAssertions
 */
export const createApiV1AccountsAccountIdEvaluationsValidateAssertions = async (args: CreateApiV1AccountsAccountIdEvaluationsValidateAssertionsArgs, options: CreateApiV1AccountsAccountIdEvaluationsValidateAssertionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/accounts/${encodeURIComponent(String(args.account_id))}/evaluations:validateAssertions${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(gatewayValidateAssertionsResponse, await res.json())
};