flotilla/src/app/components/WalletPay.svelte

<script lang="ts">
  import {Invoice} from "@getalby/lightning-tools/bolt11"
  import {debounce} from "throttle-debounce"
  import {session} from "@welshman/app"
  import Bolt from "@assets/icons/bolt.svg?dataurl"
  import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
  import Icon from "@lib/components/Icon.svelte"
  import Button from "@lib/components/Button.svelte"
  import FieldInline from "@lib/components/FieldInline.svelte"
  import Scanner from "@lib/components/Scanner.svelte"
  import ModalHeader from "@lib/components/ModalHeader.svelte"
  import ModalFooter from "@lib/components/ModalFooter.svelte"
  import {payInvoice} from "@app/core/commands"
  import {pushToast} from "@app/util/toast"
  import {clearModals} from "@app/util/modal"

  const back = () => history.back()

  const onScan = debounce(1000, async (data: string) => {
    invoice = new Invoice({pr: data})
    sats = invoice.satoshi || 0
  })

  const confirm = async () => {
    loading = true

    try {
      await payInvoice(invoice!.paymentRequest, sats * 1000)

      pushToast({message: `Payment sent!`})
      clearModals()
    } catch (e) {
      console.error(e)

      const message = String(e).replace(/^.*Error: /, "")

      pushToast({
        theme: "error",
        message: `Failed to send payment: ${message}`,
      })
    } finally {
      loading = false
    }
  }

  let loading = $state(false)
  let invoice: Invoice | undefined = $state()
  let sats = $state(0)
</script>

<div class="column gap-4">
  <ModalHeader>
    {#snippet title()}
      <div>Pay with Lightning</div>
    {/snippet}
    {#snippet info()}
      Use your Nostr wallet to send Bitcoin payments over lightning.
    {/snippet}
  </ModalHeader>
  {#if invoice}
    <div class="card2 bg-alt flex flex-col gap-2">
      {#if $session?.wallet?.type === "webln" && invoice.satoshi === 0}
        <p class="text-sm opacity-75">
          Uh oh! It looks like your current wallet doesn't support invoices without an amount. See
          if you can get a lightning invoice with a pre-set amount.
        </p>
      {:else}
        <FieldInline>
          {#snippet label()}
            Amount (satoshis)
          {/snippet}
          {#snippet input()}
            <div class="flex flex-grow justify-end">
              <label class="input input-bordered flex items-center gap-2">
                <Icon icon={Bolt} />
                <input
                  bind:value={sats}
                  type="number"
                  class="w-14"
                  disabled={invoice!.satoshi > 0} />
              </label>
            </div>
          {/snippet}
        </FieldInline>
        <p class="text-sm opacity-75">
          You're about to pay a bitcoin lightning invoice with the following description:
          <strong>{invoice.description || "[no description]"}</strong>"
        </p>
      {/if}
    </div>
  {:else}
    <Scanner onscan={onScan} />
    <p class="text-center text-sm opacity-75">
      To make a payment, scan a lightning invoice with your camera.
    </p>
  {/if}
  <ModalFooter>
    <Button class="btn btn-link" onclick={back}>
      <Icon icon={AltArrowLeft} />
      Go back
    </Button>
    <Button class="btn btn-primary" onclick={confirm} disabled={!invoice || sats === 0 || loading}>
      {#if loading}
        <span class="loading loading-spinner loading-sm"></span>
      {:else}
        <Icon icon={Bolt} />
      {/if}
      Confirm Payment
    </Button>
  </ModalFooter>
</div>