import {z} from 'zod'

export type Runtime = 'emerald' | 'sapphire' | 'pontusxtest' | 'pontusxdev' | 'cipher';

export type EthOrOasisAddress = string;

export type GetApiRuntimeEvmTokensAddressHoldersArgs = {limit?: number | undefined, offset?: number | undefined, runtime: Runtime, address: EthOrOasisAddress};

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

export const textBigInt = z.string();

export const bareTokenHolder = z.object({holder_address: z.string(), eth_holder_address: z.string().optional(), balance: textBigInt});

export const tokenHolderList = z.object({total_count: z.number().int(), is_total_count_clipped: z.boolean(), holders: z.array(bareTokenHolder)});

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 the list of holders of an EVM (ERC-20, ...) token.
 * This endpoint does not verify that `address` is actually an EVM token; if it is not, it will simply return an empty list.
 * 
 * 
 * GET /{runtime}/evm_tokens/{address}/holders
 */
export const getApiRuntimeEvmTokensAddressHolders = async (args: GetApiRuntimeEvmTokensAddressHoldersArgs, options?: GetApiRuntimeEvmTokensAddressHoldersOptions) => {
const {baseUrl = "https://nexus.oasis.io/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.limit != null) query.append("limit", String(args.limit))
if (args.offset != null) query.append("offset", String(args.offset))

const url = `${baseUrl.replace(/\/+$/, '')}/${encodeURIComponent(String(args.runtime))}/evm_tokens/${encodeURIComponent(String(args.address))}/holders${query.size > 0 ? `?${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(tokenHolderList, await res.json())
};