import {z} from 'zod'

export type GetApiPipelineHealthArgs = {interval_minutes?: number | undefined, pipeline_ids?: Array<string> | undefined};

export type GetApiPipelineHealthOptions = {baseUrl?: string | undefined, PipelineServiceKey?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiPipelineHealthResponse = z.object({meta: z.record(z.string(), z.unknown()).optional(), data: z.object({interval_minutes: z.number().int().optional(), ingestion_health: z.object({ingestion_metrics_status: z.string().optional(), routes: z.array(z.object({route: z.string().optional(), health: z.array(z.object({status_code: z.number().int().optional(), change_percent: z.number().optional()})).optional()})).optional()}).optional(), pipeline_health: z.object({lag_metrics_status: z.string().optional(), pipelines: z.array(z.object({id: z.string().optional(), title: z.string().optional(), published_at: z.string().optional(), sources: z.array(z.object({id: z.string().optional(), type: z.string().optional(), title: z.string().optional(), is_consumer_group: z.boolean().optional(), lag_event_count: z.number().nullable().optional()})).optional()})).optional()}).optional()}).optional()});

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
};

/**
 * Summarize pipeline health for one or more pipelines
 * 
 * GET /pipeline/health
 */
export const getApiPipelineHealth = async (args: GetApiPipelineHealthArgs, options?: GetApiPipelineHealthOptions) => {
const {baseUrl = "https://api.mezmo.com/v3", fetch: fetchFn = fetch, PipelineServiceKey} = options ?? {}

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

if (args.interval_minutes != null) query.append("interval_minutes", String(args.interval_minutes))
for (const item of args.pipeline_ids ?? []) query.append("pipeline_ids", String(item))
if (PipelineServiceKey !== undefined) headers.set("Authorization", PipelineServiceKey)

const url = `${baseUrl.replace(/\/+$/, '')}/pipeline/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(getApiPipelineHealthResponse, await res.json())
};