import {z} from 'zod'

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

export const remnaWaveSystemSummary = z.object({users_online: z.number().int(), total_users: z.number().int(), active_connections: z.number().int(), nodes_online: z.number().int(), users_last_day: z.number().int(), users_last_week: z.number().int(), users_never_online: z.number().int(), total_user_traffic: z.number().int()});

export const remnaWaveServerInfo = z.object({cpu_cores: z.number().int(), cpu_physical_cores: z.number().int(), memory_total: z.number().int(), memory_used: z.number().int(), memory_free: z.number().int(), memory_available: z.number().int(), uptime_seconds: z.number().int()});

export const remnaWaveBandwidth = z.object({realtime_download: z.number().int(), realtime_upload: z.number().int(), realtime_total: z.number().int()});

export const remnaWaveTrafficPeriod = z.object({current: z.number().int(), previous: z.number().int(), difference: z.string().nullable().optional()});

export const remnaWaveTrafficPeriods = z.object({last_2_days: remnaWaveTrafficPeriod, last_7_days: remnaWaveTrafficPeriod, last_30_days: remnaWaveTrafficPeriod, current_month: remnaWaveTrafficPeriod, current_year: remnaWaveTrafficPeriod});

export const remnaWaveSystemStatsResponse = z.object({system: remnaWaveSystemSummary, users_by_status: z.record(z.string(), z.number().int()), server_info: remnaWaveServerInfo, bandwidth: remnaWaveBandwidth, traffic_periods: remnaWaveTrafficPeriods, nodes_realtime: z.array(z.record(z.string(), z.unknown())).optional(), nodes_weekly: z.array(z.record(z.string(), z.unknown())).optional(), last_updated: z.string().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
};

/**
 * Get System Statistics
 * 
 * GET /remnawave/system
 */
export const getApiRemnawaveSystem = async (options: GetApiRemnawaveSystemOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (APIKeyHeader !== undefined) headers.set("X-API-Key", APIKeyHeader)

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