import { DigitalBitsTomlResolver } from "@digitalbits-blockchain/xdb-digitalbits-sdk";
import { RegulatedAssetInfo } from "../types/sep8";

export async function getApprovalServerUrl(
  param: RegulatedAssetInfo,
  opts: DigitalBitsTomlResolver.DigitalBitsTomlResolveOptions = {}
): Promise<string> {
  if (!param.home_domain) {
    throw new Error(`Issuer's home domain is missing`);
  }

  const tomlObject = await DigitalBitsTomlResolver.resolve(
    param.home_domain,
    opts
  );
  if (!tomlObject.CURRENCIES) {
    throw new Error(
      `digitalbits.toml at ${param.home_domain} does not contain CURRENCIES field`
    );
  }

  for (const ast of tomlObject.CURRENCIES) {
    if (ast.code === param.asset_code && ast.issuer === param.asset_issuer) {
      if (!ast.approval_server) {
        throw new Error(
          `digitalbits.toml at ${param.home_domain} does not contain approval_server information for this asset`
        );
      }

      return ast.approval_server;
    }
  }

  throw new Error(
    `CURRENCY ${param.asset_code}:${param.asset_issuer} not found on digitalbits.toml at ${param.home_domain}`
  );
}