import {z} from 'zod'

export type GetApiV1AnalyticsToolsMonitoringAnomalyDetectionArgs = {baseline_days?: number | undefined, z_threshold?: number | undefined, min_invocations?: number | undefined, tool_id?: (string | null) | undefined, tool_type?: (string | null) | undefined, start_date: string, end_date: string};

export type GetApiV1AnalyticsToolsMonitoringAnomalyDetectionOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const anomalyDetectionRow = z.object({tool_id: z.string(), tool_name: z.string(), tool_type: z.string(), invocation_count: z.number().int(), error_count: z.number().int(), current_error_rate: z.number(), current_p95_latency_ms: z.number(), baseline_valid_days: z.number().int(), baseline_error_rate_mean: z.number().nullable().optional(), baseline_error_rate_stddev: z.number().nullable().optional(), baseline_p95_latency_mean: z.number().nullable().optional(), baseline_p95_latency_stddev: z.number().nullable().optional(), error_rate_zscore: z.number().nullable().optional(), p95_latency_zscore: z.number().nullable().optional(), is_error_rate_anomaly: z.number().int(), is_latency_anomaly: z.number().int(), is_anomaly: z.number().int()});

export const getApiV1AnalyticsToolsMonitoringAnomalyDetectionResponse = z.array(anomalyDetectionRow);

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
};

/**
 * Per-tool z-score anomaly scan vs a rolling baseline (window <= 1 day)
 * 
 * GET /v1/analytics/tools/monitoring/anomaly-detection
 */
export const getApiV1AnalyticsToolsMonitoringAnomalyDetection = async (args: GetApiV1AnalyticsToolsMonitoringAnomalyDetectionArgs, options: GetApiV1AnalyticsToolsMonitoringAnomalyDetectionOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.baseline_days != null) query.append("baseline_days", String(args.baseline_days))
if (args.z_threshold != null) query.append("z_threshold", String(args.z_threshold))
if (args.min_invocations != null) query.append("min_invocations", String(args.min_invocations))
if (args.tool_id != null) query.append("tool_id", String(args.tool_id))
if (args.tool_type != null) query.append("tool_type", String(args.tool_type))
if (args.start_date != null) query.append("start_date", String(args.start_date))
if (args.end_date != null) query.append("end_date", String(args.end_date))
if (APIKeyHeader !== undefined) headers.set("x-api-key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/analytics/tools/monitoring/anomaly-detection${query.size > 0 ? `?${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(getApiV1AnalyticsToolsMonitoringAnomalyDetectionResponse, await res.json())
};