// Create a new MicroStellar client connected to the testnet. Use "public" to
// connect to public horizon servers, or "custom" to connect to your own instance.
ms := microstellar.New("test")

// Generate a new random keypair. In stellar lingo, a "seed" is a private key, and
// an "address" is a public key. (Not technically accurate, but you get the picture.)
//
// Seed strings begin with "S" -- "S6H4HQPE6BRZKLK3QNV6LTD5BGS7S6SZPU3PUGMJDJ26V7YRG3FRNPGA"
// Address strings begin with "G" -- "GAUYTZ24ATLEBIV63MXMPOPQO2T6NHI6TQYEXRTFYXWYZ3JOCVO6UYUM"
bob, _ := ms.CreateKeyPair()
log.Print(bob.Seed, bob.Address)

// In stellar, you can create all kinds of asset types -- dollars, houses, kittens. These
// customized assets are called credit assets.
//
// However, the native asset is always lumens (XLM). Lumens are used to pay for transactions
// on the stellar network, and are used to fund the operations of Stellar.
//
// When you first create a key pair, you need to fund it with atleast 0.5 lumens. This
// is called the "base reserve", and makes the account valid. You can only transact to
// and from accounts that maintain the base reserve.
ms.FundAccount(kelly.Seed, bob.Address, "1")

// On the test network, you can ask FriendBot to fund your account. You don't need to buy
// lumens. (If you do want to buy lumens for the test network, call me!)
microstellar.FundWithFriendBot(bob.Address)

// Pay someone 3 lumens.
ms.PayNative(kelly.Seed, bob.Address, "3")

// Set the memo field on a payment.
err := ms.Pay(kelly.Seed, bob.Address, "3",
  microstellar.Opts().WithMemoText("thanks for the fish"))

// Find out where the transaction was submitted.
if err == nil {
  fmt.Printf("Transaction submitted to ledger: %d", ms.Response().Ledger)
}

// Get kelly's balance.
account, _ := ms.LoadAccount(kelly.Address)
log.Printf("Native Balance: %v XLM", account.GetNativeBalance())

// Create a custom asset with the code "USD" issued by some trusted issuer.
USD := microstellar.NewAsset("USD", chaseBank.address, Credit4Type)

// Create a trust line from an account to the asset, with a limit of 10000.
ms.CreateTrustLine(kelly.Seed, USD, "10000")

// Make a payment in the asset.
ms.Pay(kelly.Seed, mary.Address, USD, "10",
  microstellar.Opts().WithMemo("funny money"))

// Require trustlines to be authorized buy issuer.
ms.SetFlags(issuer.Seed, microstellar.FlagAuthRequired)

// Authorize a trustline after it's been created
ms.AllowTrust(issuer.Seed, mary.Address, "USD", true)

// Add Bob as a signer to Kelly's account with the key weight 1.
ms.AddSigner(kelly.Seed, bob.Address, 1)

// Add Mary as a signer to Kelly's account.
ms.AddSigner(kelly.Seed, mary.Address, 1)

// Set the low, medium, and high thresholds of KElly's account. (Here we require a minimum
// total signing weight of 2 for all operations.)
ms.SetThresholds(kelly.Seed, 2, 2, 2)

// Disable Kelly's master key, so only Bob and Mary can sign her transactions.
ms.SetMasterWeight(kelly.Seed,
   microstellar.Opts().
     WithSigner(kelly.Seed).
     WithSigner(mary.Seed))

// Make a payment (and sign with new signers). Note that the first parameter (source) here
// can be an address instead of a seed (since the seed can't sign anymore.)
ms.PayNative(kelly.Address, pizzahut.Address, USD, "20".
  microstellar.Opts().
    WithSigner(mary.Seed).
    WithSigner(kelly.Seed))

// Sell 100 USD for lumens on the DEX at 2 lumens/USD.
err := ms.CreateOffer(bob.Seed, USD, NativeAsset, "2", "100",
  Opts().MakePassive())

// No takers, update the offer.
err := ms.UpdateOffer(bob.Seed, offerID, USD, NativeAsset, "3", "150")

// Get the order book for all USD -> Lumen trades on the DEX.
orderBook, err := ms.LoadOrderBook(USD, microstellar.NativeAsset)

// Get all offers made by Bob.
offers, err := ms.LoadOffers(bob.Seed)

// Path payments let you transparently convert currencies. Pay 5000 INR with XLM,
// going through USD and EUR. Spend no more than 40 lumens on this transaction.
err := ms.Pay(kelly.Seed, mary.Address, "5000", INR, // mary gets 5000 INR
  microstellar.Opts().
    WithAsset(XLM, "40"). // we spend no more than 40 XLM
    Through(USD, EUR))    // go through USD and EUR

// Microstellar can automatically find paths for you, if you don't know what paths
// to take beforehand.
err := ms.Pay(kelly.Seed, mary.Address, "5000", INR, // mary receives 5000 INR
  Opts().
    WithAsset(XLM, "40"). // we spend no more than 40 XLM
    FindPathFrom(kelly.Address))

// Start a mult-op transaction signed by Mary
ms.Start(bob.Address,
  microstellar.Opts().
    WithMemoText("multi-op").
    WithSigner(mary.Seed))

// Set the home domain for Bob's account.
ms.SetHomeDomain(bob.Address, "qubit.sh")

// Attach arbitrary data to Bob's account.
ms.SetData(bob.Address, "foo", []byte("bar"))

// Set Bob's account flags.
ms.SetFlags(bob.Address, microstellar.FlagAuthRequired | microstellar.FlagsAuthImmutable)

// Make some payments
ms.Pay(bob.Address, pizzaHut.Address, USD, "500")
ms.PayNative(bob.Address, mary.Address, "25")

// Sign and submit the transaction.
ms.Submit()

// Load account to see check if it worked.
account, _ := ms.LoadAccount(bob.Address)
foo, ok := account.GetData("foo")
if ok {
  fmt.Printf("Bob's data for foo: %s", string(foo))
}

fmt.Printf("Bob's home domain: %s", account.GetHomeDomain())

// Create a transaction valid between 1 and 8 hours from now.
ms.Start(bob.Address,
  microstellar.Opts().WithTimeBounds(time.Now().After(1*time.Hour), time.Now().After(8.time.Hour)))
ms.Pay(bob.Address, pizzaHut.Address, USD, "500")

// Get the transaction to submit later.
payload := ms.Payload()

// A few hours later...
signedPayload, _ := ms.SignTransaction(payload, bob.Seed)
ms.SubmitTransaction(signedPayload)

// Watch for payments to and from address starting from now.
watcher, err := ms.WatchPayments(bob.Address, Opts().WithCursor("now"))

go func() {
  for p := range watcher.Ch {
    log.Printf("Saw payment on Bob's address: %+v", p)
  }
}()

// Stream the ledger for about a second then stop the watcher.
time.Sleep(1 * time.Second)
watcher.Done()

// Watch for transactions from address.
watcher, err := ms.WatchTransactions(kelly.Address, Opts().WithCursor("now"))

// Get the firehose of ledger updates.
watcher, err := ms.WatchLedgers(Opts().WithCursor("now"))