import xdr from '../xdr';
import { Asset } from '../asset';

/**
 * Create a new claimable balance operation.
 *
 * @function
 * @alias Operation.createClaimableBalance
 *
 * @param {object} opts Options object
 * @param {Asset} opts.asset - The asset for the claimable balance.
 * @param {string} opts.amount - Amount.
 * @param {Claimant[]} opts.claimants - An array of Claimants
 * @param {string} [opts.source] - The source account for the operation. Defaults to the transaction's source account.
 *
 * @returns {xdr.Operation} Create claimable balance operation
 *
 * @example
 * const asset = new Asset(
 *   'USD',
 *   'GDGU5OAPHNPU5UCLE5RDJHG7PXZFQYWKCFOEXSXNMR6KRQRI5T6XXCD7'
 * );
 * const amount = '100.0000000';
 * const claimants = [
 *   new Claimant(
 *     'GCEZWKCA5VLDNRLN3RPRJMRZOX3Z6G5CHCGSNFHEYVXM3XOJMDS674JZ',
 *      Claimant.predicateBeforeAbsoluteTime("4102444800000")
 *   )
 * ];
 *
 * const op = Operation.createClaimableBalance({
 *   asset,
 *   amount,
 *   claimants
 * });
 *
 */
export function createClaimableBalance(opts) {
  if (!(opts.asset instanceof Asset)) {
    throw new Error(
      'must provide an asset for create claimable balance operation'
    );
  }

  if (!this.isValidAmount(opts.amount)) {
    throw new TypeError(this.constructAmountRequirementsError('amount'));
  }

  if (!Array.isArray(opts.claimants) || opts.claimants.length === 0) {
    throw new Error('must provide at least one claimant');
  }

  const attributes = {};
  attributes.asset = opts.asset.toXDRObject();
  attributes.amount = this._toXDRAmount(opts.amount);
  attributes.claimants = Object.values(opts.claimants).map((c) =>
    c.toXDRObject()
  );

  const createClaimableBalanceOp = new xdr.CreateClaimableBalanceOp(attributes);

  const opAttributes = {};
  opAttributes.body = xdr.OperationBody.createClaimableBalance(
    createClaimableBalanceOp
  );
  this.setSourceAccount(opAttributes, opts);

  return new xdr.Operation(opAttributes);
}