import {z} from 'zod'

export type Checkpoint = 'input' | 'output';

export type CheckContext = {checkpoint: Checkpoint, user_prompt?: (string | null) | undefined};

export type GuardrailImage = {search_store_id: string, file_id: string};

export type CheckRequest = {application_id?: (string | null) | undefined, check_type: Checkpoint, input: string, context?: (CheckContext | null) | undefined, images?: Array<GuardrailImage> | undefined, unreferenced_image_count?: number | undefined, if_unconfigured?: ('error' | 'allow') | undefined};

export type CreateApiV1CheckArgs = {body: CheckRequest};

export type CreateApiV1CheckOptions = {baseUrl?: string | undefined, HTTPBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const violation = z.object({category: z.string(), provider: z.string(), stage: z.string(), step: z.number().int(), reason: z.string().nullable().optional()});

export const guardrailAction = z.enum(["allow", "label", "block"]);

export const checkpoint = z.enum(["input", "output"]);

export const checkResponse = z.object({safe: z.boolean(), violations: z.array(violation), action: guardrailAction.optional(), evaluated: z.boolean().optional(), configured_checkpoints: z.array(checkpoint).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
};

/**
 * Post Check Endpoint
 * 
 * POST /v1/check
 */
export const createApiV1Check = async (args: CreateApiV1CheckArgs, options?: CreateApiV1CheckOptions) => {
const {baseUrl = "https://api.pharia.example.com", fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

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

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