import {z} from 'zod'

export type PolicyEvaluationResult = 'pass' | 'fail' | 'error' | 'skipped';

export type PolicyEnforcementPoint = 'input' | 'pre_tool' | 'post_tool' | 'agent_response';

export type GetApiV1PoliciesEvaluationsArgs = {conversation_id?: (string | null) | undefined, policy_id?: (string | null) | undefined, result?: (PolicyEvaluationResult | null) | undefined, enforcement_point?: (PolicyEnforcementPoint | null) | undefined, limit?: number | undefined, cursor?: (string | null) | undefined};

export type GetApiV1PoliciesEvaluationsOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const policyEvaluationResponse = z.object({id: z.string(), policy_id: z.string(), policy_name: z.string().nullable().optional(), organization_id: z.string(), conversation_id: z.string().nullable().optional(), agent_id: z.string().nullable().optional(), enforcement_point: z.string(), mode: z.string().nullable().optional(), transport_class: z.string().nullable().optional(), channel: z.string().nullable().optional(), result: z.string(), action_taken: z.string().nullable().optional(), would_be_action: z.string().nullable().optional(), violation_detail: z.record(z.string(), z.unknown()).nullable().optional(), latency_ms: z.number().int().nullable().optional(), created_at: z.string()});

export const cursorPagePolicyEvaluationResponse = z.object({items: z.array(policyEvaluationResponse), next_cursor: z.string().nullable().optional(), has_more: z.boolean()});

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 policy evaluation audit rows (what enforcement happened, newest-first)
 * 
 * GET /v1/policies/evaluations
 */
export const getApiV1PoliciesEvaluations = async (args: GetApiV1PoliciesEvaluationsArgs, options: GetApiV1PoliciesEvaluationsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.conversation_id != null) query.append("conversation_id", String(args.conversation_id))
if (args.policy_id != null) query.append("policy_id", String(args.policy_id))
if (args.result != null) query.append("result", String(args.result))
if (args.enforcement_point != null) query.append("enforcement_point", String(args.enforcement_point))
if (args.limit != null) query.append("limit", String(args.limit))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

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