import {z} from 'zod'

export type GetApiV1PrivacyAuditStatsArgs = {from?: (string | null) | undefined, to?: (string | null) | undefined, bucket?: ('day' | 'hour') | undefined};

export type GetApiV1PrivacyAuditStatsOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const auditEntityStat = z.object({entity_type: z.string(), event_count: z.number().int()});

export const auditTrendBucket = z.object({bucket_start: z.string(), event_count: z.number().int(), detection_count: z.number().int()});

export const auditStatsResponse = z.object({period_start: z.string(), period_end: z.string(), total_events: z.number().int(), total_detections: z.number().int(), by_source: z.record(z.string(), z.number().int()), by_entity_type: z.array(auditEntityStat), trend: z.array(auditTrendBucket)});

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
};

/**
 * Aggregate PII scrub stats
 * 
 * GET /v1/privacy/audit-stats
 */
export const getApiV1PrivacyAuditStats = async (args: GetApiV1PrivacyAuditStatsArgs, options: GetApiV1PrivacyAuditStatsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))
if (args.bucket != null) query.append("bucket", String(args.bucket))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/privacy/audit-stats${query.size > 0 ? `?${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(auditStatsResponse, await res.json())
};