/*
    This third approach is nearly identical to the second. The only difference is
    here I define an empty public key as the public key created from the empty
    string. 
    
    In order to make this work, I had to make one change to the js stellar sdk
    codebase. In the keypair.js file, I added a case to the fromPublicKey method
    that accepts "" and returns a keypair generated from the
    "00000000000000000000000000000000" string. This adds three lines of code.
*/


// 1. build the partial transaction (excludes the source account and sequence numbers
// Define an empty address
const emptyAddress_a3 = s.Keypair.fromPublicKey("").publicKey();

// Define an account
const account_a3 = new s.Account(emptyAddress_a3, "0");

// Define a transaction object
let tx_a3 = new s.TransactionBuilder(account_a3);

// Add payment operation
tx_a3.addOperation(s.Operation.payment({
    destination: "GASIA4ZTLZEF4TRLLDQCQIT43KNZKSAEU3PX3BQVNEZVNJ4FM7LBIPTK",
    asset: s.Asset.native(),
    amount: "1",
}))

// Add a memo if included (Optional)
// tx_a2.addMemo(s.Memo.text("SEP, SEP 007"));

// 2. Convert to a transaction envelope
tx_a3 = tx_a3.build().toEnvelope();

// 3. Convert to Base64
tx_a3 = tx_a3.toXDR('base64');

// 4. Url encode (Optional)
const url_a3 = encodeURIComponent(tx_a3);

// 5. Print out ("web+stellar:tx?xdr=" + urlEncoded) (Optional)
// console.log(`web+stellar:tx?xdr=${url_a3}`);
/*
    Result:
    web+stellar:tx?xdr=AAAAADAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwAAAAZAAAAAAAAAABAAAAAAAAAAAAAAABAAAAAAAAAAEAAAAAJIBzM15IXk4rWOAoInzam5VIBKbffYYVaTNWp4Vn1hQAAAAAAAAAAACYloAAAAAAAAAAAA%3D%3D
*/