import {z} from 'zod'

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

export const aggregateAddressTypesCount = z.object({count: z.number().int().optional(), interfaces: z.array(z.string()).optional()});

export const aggregateAddressStatusCount = z.object({count: z.number().int().optional(), status: z.string().optional()});

export const aggregateStatistics = z.object({account_count: z.number().int().optional(), address_count: z.number().int().optional(), address_count_by_interfaces: z.array(aggregateAddressTypesCount).optional(), address_count_by_status: z.array(aggregateAddressStatusCount).optional(), contract_interface_count: z.number().int().optional(), contract_operation_count: z.number().int().optional(), first_masterchain_block: z.number().int().optional(), last_masterchain_block: z.number().int().optional(), masterchain_block_count: z.number().int().optional(), message_count: z.number().int().optional(), message_count_by_operation: z.array(z.object({count: z.number().int().optional(), operation: z.string().optional()})).optional(), parsed_account_count: z.number().int().optional(), parsed_address_count: z.number().int().optional(), parsed_message_count: z.number().int().optional(), transaction_count: z.number().int().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
};

/**
 * statistics on all tables
 * 
 * GET /statistics
 */
export const getApiStatistics = async (options?: GetApiStatisticsOptions) => {
const {baseUrl = "https://anton.tools/api/v0", fetch: fetchFn = fetch} = options ?? {}

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

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