const set_up_tx_sender = async function() {
  //////////////////////////////////////////////////////////////////////////////
  // Notification helpers
  //////////////////////////////////////////////////////////////////////////////

  function successNotif(msg) {
    $.bootstrapGrowl(msg, {
      delay: 7000,
      offset: {from: 'bottom', amount: 68},
      type: 'success',
      width: 'auto'
    })
  }
  function errorNotif(msg) {
    $.bootstrapGrowl(msg, {
      delay: 7000,
      offset: {from: 'bottom', amount: 68},
      type: 'danger',
      width: 'auto'
    })
  }

  function logTx(txtype, hash, result) {
    let classes
    let icon
    const txlink = "https://testnet.xrpl.org/transactions/" + hash
    if (result === "tesSUCCESS") {
      classes = "text-muted"
      icon = '<i class="fa fa-check-circle"></i>'
    } else {
      classes = "list-group-item-danger"
      icon = '<i class="fa fa-times-circle"></i>'
    }
    const li = `<li class="list-group-item fade-in p-1 ${classes}">${icon} ${txtype}: <a href="${txlink}" target="_blank" class="external-link">${hash}</a></li>`

    $("#tx-sender-history ul").prepend(li)
  }

  //////////////////////////////////////////////////////////////////////////////
  // Connection / Setup
  //////////////////////////////////////////////////////////////////////////////

  const FAUCET_URL = "https://faucet.altnet.rippletest.net/accounts"
  const TESTNET_URL = "wss://s.altnet.rippletest.net:51233"

  let connection_ready = false
  api = new xrpl.Client(TESTNET_URL)

  let sending_wallet
  let xrp_balance = "TBD"

  function enable_buttons_if_ready() {
    if ( (typeof sending_wallet) === "undefined") {
      console.debug("No sending address yet...")
      return false
    }

    if (!connection_ready) {
      console.debug("API not connected yet...")
      return false
    }

    $(".needs-connection").prop("disabled", false)
    $(".needs-connection").removeClass("disabled")
    set_up_for_partial_payments()
    return true
  }

  $("#init_button").click(async (evt) => {
    console.log("Connecting to Testnet WebSocket...")
    await api.connect()

    console.debug("Getting a sending address from the faucet...")
    try {
      const fund_response = await api.fundWallet()
      sending_wallet = fund_response.wallet
      xrp_balance = xrpl.dropsToXrp(fund_response.balance)
    } catch(error) {
      console.error(error)
      errorNotif("There was an error with the XRP Ledger Testnet Faucet. Reload this page to try again.")
      return
    }

    $("#balance-item").text(xrp_balance)

    $(".sending-address-item").text(sending_wallet.address)
    $("#init_button").prop("disabled", "disabled")
    $("#init_button").addClass("disabled")
    $("#init_button").attr("title", "Done")
    $("#init_button").append('&nbsp;<i class="fa fa-check-circle"></i>')
    enable_buttons_if_ready()
  })

  api.on('connected', () => {
    connection_ready = true
    $("#connection-status-item").text("Connected")
    $("#connection-status-item").removeClass("disabled").addClass("active")
    enable_buttons_if_ready()
  })
  api.on('disconnected', (code) => {
    connection_ready = false
    $("#connection-status-item").text("Not connected")
    $("#connection-status-item").removeClass("active").addClass("disabled")
  })

  //////////////////////////////////////////////////////////////////////////////
  // Generic Transaction Submission
  //////////////////////////////////////////////////////////////////////////////

  // Helper function for await-able timeouts
  function timeout(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
  }

  async function update_xrp_balance() {
    balances = await api.getBalances(sending_wallet.address, {currency: "XRP"})
    $("#balance-item").text(balances[0].value)
  }


  async function submit_and_notify(tx_object, use_wallet, silent) {
    if (use_wallet === undefined) {
      use_wallet = sending_wallet
    }
    try {
      // Auto-fill fields like Fee and Sequence
      prepared = await api.autofill(tx_object)
      console.debug("Prepared:", prepared)
    } catch(error) {
      console.log(error)
      if (!silent) {
        errorNotif("Error preparing tx: "+error)
      }
      return
    }

    try {
      const {tx_blob, hash} = use_wallet.sign(prepared)
      const final_result_data = await api.submitAndWait(tx_blob)
      console.log("final_result_data is", final_result_data)
      let final_result = final_result_data.result.meta.TransactionResult
      if (!silent) {
        if (final_result === "tesSUCCESS") {
          successNotif(`${tx_object.TransactionType} tx succeeded (hash: ${hash})`)
        } else {
          errorNotif(`${tx_object.TransactionType} tx failed w/ code ${final_result}
                      (hash: ${hash})`)
        }
        logTx(tx_object.TransactionType, hash, final_result)
      }
      update_xrp_balance()
      return final_result_data
    } catch (error) {
      console.log(error)
      if (!silent) {
        errorNotif(`Error signing & submitting ${tx_object.TransactionType} tx: ${error}`)
      }
      return
    }

  }

  //////////////////////////////////////////////////////////////////////////////
  // Issuer Setup for Partial Payments
  // (Partial payments must involve at least one issued currency, so we set up
  //  an issuer for a fake currency to ripple through.)
  //////////////////////////////////////////////////////////////////////////////

  let pp_issuer_wallet
  let pp_sending_currency = "BAR"
  async function set_up_for_partial_payments() {
    while (!connection_ready) {
      console.debug("... waiting for connection before doing partial payment setup")
      await timeout(200)
    }
    console.debug("Starting partial payment setup...")
    $("#pp_progress .progress-bar").addClass("progress-bar-animated")
    // 1. Get a funded address to use as issuer
    try {
      const fund_response = await api.fundWallet()
      pp_issuer_wallet = fund_response.wallet
    } catch(error) {
      console.log("Error getting issuer address for partial payments:", error)
      return
    }
    $("#pp_progress .progress-bar").width("20%")

    // 2. Set Default Ripple on issuer
    let resp = await submit_and_notify({
      TransactionType: "AccountSet",
      Account: pp_issuer_wallet.address,
      SetFlag: xrpl.AccountSetAsfFlags.asfDefaultRipple
    }, pp_issuer_wallet, true)
    if (resp === undefined) {
      console.log("Couldn't set Default Ripple for partial payment issuer")
      return
    }
    $("#pp_progress .progress-bar").width("40%")

    // 3. Make a trust line from sending address to issuer
    resp = await submit_and_notify({
      TransactionType: "TrustSet",
      Account: sending_wallet.address,
      LimitAmount: {
        currency: pp_sending_currency,
        value: "1000000000", // arbitrarily, 1 billion fake currency
        issuer: pp_issuer_wallet.address
      }
    }, sending_wallet, true)
    if (resp === undefined) {
      console.log("Error making trust line to partial payment issuer")
      return
    }
    $("#pp_progress .progress-bar").width("60%")

    // 4. Issue fake currency to main sending address
    resp = await submit_and_notify({
      TransactionType: "Payment",
      Account: pp_issuer_wallet.address,
      Destination: sending_wallet.address,
      Amount: {
        currency: pp_sending_currency,
        value: "1000000000",
        issuer: pp_issuer_wallet.address
      }
    }, pp_issuer_wallet, true)
    if (resp === undefined) {
      console.log("Error sending fake currency from partial payment issuer")
      return
    }
    $("#pp_progress .progress-bar").width("80%")

    // 5. Place offer to buy issued currency for XRP
    // When sending the partial payment, the sender consumes their own offer (!)
    // so they end up paying themselves issued currency then delivering XRP.
    resp = await submit_and_notify({
      TransactionType: "OfferCreate",
      Account: sending_wallet.address,
      TakerGets: "1000000000000000", // 1 billion XRP
      TakerPays: {
        currency: pp_sending_currency,
        value: "1000000000",
        issuer: pp_issuer_wallet.address
      }
    }, sending_wallet, true)
    if (resp === undefined) {
      console.log("Error placing order to enable partial payments")
      return
    }
    $("#pp_progress .progress-bar").width("100%").removeClass("progress-bar-animated")
    $("#pp_progress").hide()

    // Done. Enable "Send Partial Payment" button
    console.log("Done getting ready to send partial payments.")
    $("#send_partial_payment button").prop("disabled",false)
    $("#send_partial_payment button").attr("title", "")
  }

  //////////////////////////////////////////////////////////////////////////////
  // Button/UI Handlers
  //////////////////////////////////////////////////////////////////////////////

  // Destination Address box -----------------------------------------------
  async function on_dest_address_update(event) {
    const d_a = $("#destination_address").val()
    if (xrpl.isValidAddress(d_a)) {
      $("#destination_address").addClass("is-valid").removeClass("is-invalid")
      if (d_a[0] == "X") {
        $("#x-address-warning").show()
      } else {
        $("#x-address-warning").hide()
      }
    } else {
      $("#destination_address").addClass("is-invalid").removeClass("is-valid")
      $("#x-address-warning").hide()
    }
  }
  $("#destination_address").change(on_dest_address_update)
  const search_params = new URLSearchParams(window.location.search)
  if (search_params.has("destination")) {
    const d_a = search_params.get("destination")
    $("#destination_address").val(d_a)
    on_dest_address_update()
  }

  // 1. Send XRP Payment Handler -------------------------------------------
  async function on_click_send_xrp_payment(event) {
    const destination_address = $("#destination_address").val()
    const xrp_drops_input = $("#send_xrp_payment_amount").val()
    $("#send_xrp_payment .loader").show()
    $("#send_xrp_payment button").prop("disabled","disabled")
    await submit_and_notify({
      TransactionType: "Payment",
      Account: sending_wallet.address,
      Destination: destination_address,
      Amount: xrp_drops_input
    })
    $("#send_xrp_payment .loader").hide()
    $("#send_xrp_payment button").prop("disabled",false)

  }
  $("#send_xrp_payment button").click(on_click_send_xrp_payment)

  // 2. Send Partial Payment Handler ---------------------------------------
  async function on_click_send_partial_payment(event) {
    const destination_address = $("#destination_address").val()
    $("#send_partial_payment .loader").show()
    $("#send_partial_payment button").prop("disabled","disabled")

    await submit_and_notify({
      TransactionType: "Payment",
      Account: sending_wallet.address,
      Destination: destination_address,
      Amount: "1000000000000000", // 1 billion XRP
      SendMax: {
        value: (Math.random()*.01).toPrecision(15), // random very small amount
        currency: pp_sending_currency,
        issuer: pp_issuer_wallet.address
      },
      Flags: xrpl.PaymentFlags.tfPartialPayment
    })
    $("#send_partial_payment .loader").hide()
    $("#send_partial_payment button").prop("disabled",false)
  }
  $("#send_partial_payment button").click(on_click_send_partial_payment)


  // 3. Create Escrow Handler ----------------------------------------------
  async function on_click_create_escrow(event) {
    const destination_address = $("#destination_address").val()
    const duration_seconds_txt = $("#create_escrow_duration_seconds").val()
    const release_auto = $("#create_escrow_release_automatically").prop("checked")

    const duration_seconds = parseInt(duration_seconds_txt, 10)
    if (duration_seconds === NaN || duration_seconds < 1) {
      errorNotif("Error: Escrow duration must be a positive number of seconds")
      return
    }
    const finish_after = xrpl.isoTimeToRippleTime(Date()) + duration_seconds

    $("#create_escrow .loader").show()
    $("#create_escrow button").prop("disabled","disabled")
    const escrowcreate_tx_data = await submit_and_notify({
      TransactionType: "EscrowCreate",
      Account: sending_wallet.address,
      Destination: destination_address,
      Amount: "1000000",
      FinishAfter: finish_after
    })

    if (escrowcreate_tx_data && release_auto) {
      // Wait until there's a ledger with a close time > FinishAfter
      // to submit the EscrowFinish
      $("#escrow_progress .progress-bar").width("0%").addClass("progress-bar-animated")
      $("#escrow_progress").show()
      let seconds_left
      let pct_done
      let latestCloseTimeRipple
      while (true) {
        seconds_left = (finish_after - xrpl.isoTimeToRippleTime(Date()))
        pct_done = Math.min(99, Math.max(0, (1-(seconds_left / duration_seconds)) * 100))
        $("#escrow_progress .progress-bar").width(pct_done+"%")
        if (seconds_left <= 0) {
          // System time has advanced past FinishAfter. But is there a new
          //  enough validated ledger?
          latest_close_time = (await api.request({
              command: "ledger",
              "ledger_index": "validated"}
            )).result.ledger.close_time
          if (latest_close_time > finish_after) {
            $("#escrow_progress .progress-bar").width("100%").removeClass("progress-bar-animated")
            break
          }
        }
        // Update the progress bar & check again in 1 second.
        await timeout(1000)
      }
      $("#escrow_progress").hide()

      // Now submit the EscrowFinish
      // Future feature: submit from a different sender, just to prove that
      //   escrows can be finished by a third party
      await submit_and_notify({
        Account: sending_wallet.address,
        TransactionType: "EscrowFinish",
        Owner: sending_wallet.address,
        OfferSequence: escrowcreate_tx_data.result.Sequence
      })
    }
    $("#create_escrow .loader").hide()
    $("#create_escrow button").prop("disabled",false)
  }
  $("#create_escrow button").click(on_click_create_escrow)

  // 4. Create Payment Channel Handler -------------------------------------
  async function on_click_create_payment_channel(event) {
    const destination_address = $("#destination_address").val()
    const xrp_drops_input = $("#create_payment_channel_amount").val()
    const pubkey = sending_wallet.publicKey
    $("#create_payment_channel .loader").show()
    $("#create_payment_channel button").prop("disabled","disabled")
    await submit_and_notify({
      TransactionType: "PaymentChannelCreate",
      Account: sending_wallet.address,
      Destination: destination_address,
      Amount: xrp_drops_input,
      SettleDelay: 30,
      PublicKey: pubkey
    })
    $("#create_payment_channel .loader").hide()
    $("#create_payment_channel button").prop("disabled",false)

    // Future feature: figure out channel ID and enable a button that creates
    //   valid claims for the given payment channel to help test redeeming
  }
  $("#create_payment_channel button").click(on_click_create_payment_channel)


  // 5. Send Issued Currency Handler ---------------------------------------
  async function on_click_send_issued_currency(event) {
    const destination_address = $("#destination_address").val()
    const issue_amount = $("#send_issued_currency_amount").val()
    const issue_code = $("#send_issued_currency_code").text()
    $("#send_issued_currency .loader").show()
    $("#send_issued_currency button").prop("disabled","disabled")
    // Future feature: cross-currency sending with paths?
    await submit_and_notify({
      TransactionType: "Payment",
      Account: sending_wallet.address,
      Destination: destination_address,
      Amount: {
        "currency": issue_code,
        "value": issue_amount,
        "issuer": sending_wallet.address
      }
    })
    $("#send_issued_currency .loader").hide()
    $("#send_issued_currency button").prop("disabled",false)
  }
  $("#send_issued_currency button").click(on_click_send_issued_currency)

  // 6. Trust For Handler
  async function on_trust_for(event) {
    const destination_address = $("#destination_address").val()
    const trust_limit = $("#trust_for_amount").val()
    const trust_currency_code = $("#trust_for_currency_code").text()
    $("#trust_for .loader").show()
    $("#trust_for button").prop("disabled","disabled")
    await submit_and_notify({
      TransactionType: "TrustSet",
      Account: sending_wallet.address,
      LimitAmount: {
        currency: trust_currency_code,
        value: trust_limit,
        issuer: destination_address
      }
    })
    $("#trust_for .loader").hide()
    $("#trust_for button").prop("disabled",false)
  }
  $("#trust_for button").click(on_trust_for)

}


$(document).ready( function() {
  set_up_tx_sender()
} )