import {z} from 'zod'

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

export const sourceHealth = z.enum(["fresh", "stale", "missing"]);

export const metricGroup = z.enum(["volume", "volume24h", "openInterest", "fees", "fees24h", "revenue", "tvl", "users", "trades"]);

export const version = z.enum(["v1", "v2"]);

export const network = z.enum(["arbitrum", "avalanche", "megaeth", "solana"]);

export const sourceStatusResponse = z.object({lastError: z.string().nullable(), lagSeconds: z.number().nullable(), health: sourceHealth, fetchedAt: z.number().nullable(), asOf: z.number().nullable(), metrics: z.array(metricGroup), version: version, network: network, id: z.string()});

export const getApiStatsSourcesResponse = z.array(sourceStatusResponse);

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 /stats/sources
 */
export const getApiStatsSources = async (options?: GetApiStatsSourcesOptions) => {
const {baseUrl = "https://arbitrum.gmxapi.io/v1", fetch: fetchFn = fetch} = options ?? {}

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

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