import {z} from 'zod'

export type GetApiDashboardHealthOptions = {baseUrl?: string | undefined, FronteggHTTPAuthentication?: string | undefined, fetch?: typeof fetch | undefined};

export const brokenPipelineRes = z.object({id: z.string(), name: z.string()}).and(z.record(z.string(), z.unknown()));

export const brokenConnectorRes = z.object({id: z.string(), name: z.string(), type: z.string()}).and(z.record(z.string(), z.unknown()));

export const activeSnapshotRes = z.object({source_id: z.string(), source_name: z.string(), topic_count: z.number().int().optional(), completed_count: z.number().int().optional()}).and(z.record(z.string(), z.unknown()));

export const topicHealthRes = z.object({topics_high_latency: z.number().int().optional(), topics_with_lag: z.number().int().optional(), max_latency_ms: z.number().int().optional(), max_lag: z.number().int().optional()}).and(z.record(z.string(), z.unknown()));

export const dashboardHealthRes = z.object({sources_broken: z.number().int().optional(), destinations_broken: z.number().int().optional(), transforms_failed: z.number().int().optional(), failed_transform_ids: z.array(z.string()).optional(), pipelines_broken: z.number().int().optional(), broken_pipelines: z.array(brokenPipelineRes).optional(), dlq_topics_with_messages: z.number().int().optional(), orphaned_topic_count: z.number().int().optional(), stale_source_count: z.number().int().optional(), partition_skew_count: z.number().int().optional(), throughput_total_rps: z.number().optional(), broken_connectors: z.array(brokenConnectorRes).optional(), sources_throttled: z.number().int().optional(), throttled_connectors: z.array(brokenConnectorRes).optional(), active_snapshots: z.array(activeSnapshotRes).optional(), topic_health: topicHealthRes.optional()}).and(z.record(z.string(), z.unknown()));

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
};

/**
 * Get dashboard health summary
 * 
 * GET /dashboard/health
 */
export const getApiDashboardHealth = async (options?: GetApiDashboardHealthOptions) => {
const {baseUrl = "https://api.streamkap.com", fetch: fetchFn = fetch, FronteggHTTPAuthentication} = options ?? {}

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

if (FronteggHTTPAuthentication !== undefined) headers.set('authorization', `Bearer ${FronteggHTTPAuthentication}`)

const url = `${baseUrl.replace(/\/+$/, '')}/dashboard/health${query.size > 0 ? `?${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(dashboardHealthRes, await res.json())
};