import {z} from 'zod'

export type PreCheckRequest = {query: string, user_token?: string | undefined, client_id: string, data_sources?: Array<string> | undefined, context?: {[key: string]: unknown} | undefined};

export type CreateApiApiPolicyPreCheckArgs = {Authorization: string, 'X-Axonflow-PEP-Handshake'?: string | undefined, body: PreCheckRequest};

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

export const rateLimitInfo = z.object({limit: z.number().int().optional(), remaining: z.number().int().optional(), reset_at: z.string().optional()});

export const preCheckResponse = z.object({decision_id: z.string().optional(), verdict: z.enum(["allow", "deny"]).optional(), approved: z.boolean().optional(), context_id: z.string().optional(), approved_data: z.record(z.string(), z.unknown()).optional(), policies: z.array(z.string()).optional(), rate_limit: rateLimitInfo.optional(), expires_at: z.string().optional(), block_reason: z.string().optional(), trace_id: z.string().optional(), engine: z.literal("anchored").optional(), subject_type: z.string().optional(), policy_bundle: z.string().optional(), legacy_validators: z.array(z.object({validator: z.enum(["indonesia_pii", "india_pii"]), action: z.enum(["blocked", "masked"])})).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
};

/**
 * Pre-check request before LLM call
 * 
 * POST /api/policy/pre-check
 */
export const createApiApiPolicyPreCheck = async (args: CreateApiApiPolicyPreCheckArgs, options?: CreateApiApiPolicyPreCheckOptions) => {
const {baseUrl = "https://agent.getaxonflow.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))
if (args['X-Axonflow-PEP-Handshake'] != null) headers.set("X-Axonflow-PEP-Handshake", String(args['X-Axonflow-PEP-Handshake']))

const url = `${baseUrl.replace(/\/+$/, '')}/api/policy/pre-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(preCheckResponse, await res.json())
};