import {z} from 'zod'

export type GetApiV1AnalyticsMemoryDashboardArgs = {granularity?: string | undefined, start_date: string, end_date: string};

export type GetApiV1AnalyticsMemoryDashboardOptions = {baseUrl: string, APIKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const memoryIngestionTimeseriesRow = z.object({time_bucket: z.string(), episodes: z.number().int(), completed: z.number().int(), failed: z.number().int(), partial: z.number().int(), skipped: z.number().int(), pending: z.number().int(), messages_synced: z.number().int(), success_rate_pct: z.number()});

export const memoryCoverageEnvelope = z.object({users_with_memory: z.number().int(), total_end_users: z.number().int(), coverage_rate_pct: z.number(), total_episodes: z.number().int(), completed_episodes: z.number().int()});

export const recallTimeseriesRow = z.object({time_bucket: z.string(), total: z.number().int(), hits: z.number().int(), empties: z.number().int(), cache_hits: z.number().int(), errors: z.number().int(), hit_rate_pct: z.number(), cache_hit_rate_pct: z.number(), avg_context_length: z.number(), p50_ms: z.number(), p90_ms: z.number(), p95_ms: z.number(), p99_ms: z.number()});

export const userDistributionRow = z.object({users: z.number().int(), episodes_p50: z.number().int(), episodes_p90: z.number().int(), messages_p50: z.number().int(), messages_p90: z.number().int(), recalls_p50: z.number().int(), recalls_p90: z.number().int(), days_since_last_recall_p50: z.number().int().nullable().optional(), days_since_last_recall_p90: z.number().int().nullable().optional()});

export const memoryDashboardEnvelope = z.object({ingestion: z.array(memoryIngestionTimeseriesRow), coverage: memoryCoverageEnvelope, recalls: z.array(recallTimeseriesRow), distribution: userDistributionRow});

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
};

/**
 * One-shot envelope of every memory analytics pipe
 * 
 * GET /v1/analytics/memory/dashboard
 */
export const getApiV1AnalyticsMemoryDashboard = async (args: GetApiV1AnalyticsMemoryDashboardArgs, options: GetApiV1AnalyticsMemoryDashboardOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (args.granularity != null) query.append("granularity", String(args.granularity))
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/memory/dashboard${query.size > 0 ? `?${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(memoryDashboardEnvelope, await res.json())
};