import {z} from 'zod'

export type MetricsQuery = {check_id: number, data_type?: string | undefined, metrics?: Array<string> | undefined, start_date?: string | undefined, end_date?: string | undefined, granularity?: ('auto' | '1min' | '15min' | '1hour' | '1day' | '1week' | '1month') | undefined, aggregation?: ('avg' | 'min' | 'max' | 'sum' | 'count' | 'median' | 'p75' | 'p90' | 'p95' | 'p99') | undefined, filters?: Record<string, never> | undefined, group_by?: Array<string> | undefined, limit?: (number | null) | undefined};

export type CreateApiApiV1MetricsChecksQueryArgs = {check_id: number, data_type?: string | undefined, metrics?: Array<unknown> | undefined, start_date?: string | undefined, end_date?: string | undefined, granularity?: ('auto' | '1min' | '15min' | '1hour' | '1day' | '1week' | '1month') | undefined, aggregation?: ('avg' | 'min' | 'max' | 'sum' | 'count' | 'median' | 'p75' | 'p90' | 'p95' | 'p99') | undefined, filters?: Record<string, never> | undefined, group_by?: Array<unknown> | undefined, limit?: number | undefined, body: MetricsQuery};

export type CreateApiApiV1MetricsChecksQueryOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const metricsQuery = z.object({check_id: z.number().int(), data_type: z.string().optional(), metrics: z.array(z.string()).optional(), start_date: z.string().optional(), end_date: z.string().optional(), granularity: z.enum(["auto", "1min", "15min", "1hour", "1day", "1week", "1month"]).optional(), aggregation: z.enum(["avg", "min", "max", "sum", "count", "median", "p75", "p90", "p95", "p99"]).optional(), filters: z.object({}).optional(), group_by: z.array(z.string()).optional(), limit: z.number().int().nullable().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
};

/**
 * Returns time-series datapoints with time bucketing and aggregation for one check.
 * 
 * POST /api/v1/metrics/checks/query/
 */
export const createApiApiV1MetricsChecksQuery = async (args: CreateApiApiV1MetricsChecksQueryArgs, options: CreateApiApiV1MetricsChecksQueryOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.check_id != null) query.append("check_id", String(args.check_id))
if (args.data_type != null) query.append("data_type", String(args.data_type))
for (const item of args.metrics ?? []) query.append("metrics", String(item))
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 (args.granularity != null) query.append("granularity", String(args.granularity))
if (args.aggregation != null) query.append("aggregation", String(args.aggregation))
if (args.filters != null) query.append("filters", JSON.stringify(args.filters))
for (const item of args.group_by ?? []) query.append("group_by", String(item))
if (args.limit != null) query.append("limit", String(args.limit))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/metrics/checks/query/${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(metricsQuery, await res.json())
};