import {z} from 'zod'

export type GetApiV1AnalyticsKnowledgeDocumentsStaleArgs = {kb_id?: (string | null) | undefined, stale_after_days?: number | undefined, limit?: number | undefined};

export type GetApiV1AnalyticsKnowledgeDocumentsStaleOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const staleDocumentRow = z.object({document_id: z.string(), knowledge_base_id: z.string(), last_completed_at: z.string(), last_retrieved_at: z.string().nullable().optional(), days_since_last_hit: z.number().int().nullable().optional()});

export const getApiV1AnalyticsKnowledgeDocumentsStaleResponse = z.array(staleDocumentRow);

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
};

/**
 * Documents currently active but unretrieved (or stale beyond N days)
 * 
 * GET /v1/analytics/knowledge/documents/stale
 */
export const getApiV1AnalyticsKnowledgeDocumentsStale = async (args: GetApiV1AnalyticsKnowledgeDocumentsStaleArgs, options: GetApiV1AnalyticsKnowledgeDocumentsStaleOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.kb_id != null) query.append("kb_id", String(args.kb_id))
if (args.stale_after_days != null) query.append("stale_after_days", String(args.stale_after_days))
if (args.limit != null) query.append("limit", String(args.limit))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/analytics/knowledge/documents/stale${query.size > 0 ? `?${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(getApiV1AnalyticsKnowledgeDocumentsStaleResponse, await res.json())
};