package components

import (
    "fmt"
)

templ Invoice(hash string, bolt11 string, msats int, expiresIn int, paid bool, redirectUrl templ.SafeURL) {
    <div class="p-5 border border-muted bg-background text-center font-mono">
        <div id="close" class="flex justify-end"><button class="w-fit text-muted hitbox hover:text-reset">X</button></div>
        <div>Payment Required</div>
        <div class="my-1">@Qr(bolt11, "lightning:"+bolt11)</div>
        <div class="my-1">{ format(msats) }</div>
        @InvoiceStatus(hash, expiresIn, paid, redirectUrl)
        <div class="none" id="bolt11-data" bolt11-data={ templ.JSONString(bolt11) } hx-preserve></div>
        <script type="text/javascript" id="bolt11-js" hx-preserve>
            var $ = selector => document.querySelector(selector)
            $("#close").addEventListener("click", function () {
                // abort in-flight polls and prevent new polls
                htmx.trigger("#poll", "htmx:abort")
                $("#poll").addEventListener("htmx:beforeRequest", e => e.preventDefault())
            })
        </script>
    </div>
}

templ InvoiceStatus(hash string, expiresIn int, paid bool, redirectUrl templ.SafeURL) {
    if paid {
        <div class="font-mono neon success my-1">PAID</div>
        <div
            id="poll"
            hx-get={ string(redirectUrl) }
            hx-trigger="load delay:3s"
            hx-target="#content"
            hx-swap="outerHTML"
            hx-select="#content"
            hx-push-url="true"
            hx-select-oob="#modal" />
    }
    else if expiresIn <= 0 {
        <div class="font-mono neon error my-1">EXPIRED</div>
    } else {
        <!-- invoice is pending -->
        <div class="font-mono my-1" id="countdown" countdown-data={ templ.JSONString(expiresIn) } hx-preserve></div>
        <script type="text/javascript" id="countdown-js" hx-preserve>
            var $ = selector => document.querySelector(selector)
            var expiresIn = JSON.parse($("#countdown").getAttribute("countdown-data"))

            function pad(num, places) {
                return String(num).padStart(places, "0")
            }

            function _countdown() {
                var minutes = Math.floor(expiresIn / 60)
                var seconds = expiresIn % 60
                var text = `${pad(minutes, 2)}:${pad(seconds, 2)}`
                try {
                    $("#countdown").innerText = text
                    expiresIn--
                } catch {
                    // countdown element disappeared
                    clearInterval(interval)
                }
            }

            _countdown()
            var interval = setInterval(_countdown, 1000)
        </script>
        <div
            id="poll"
            hx-get={ string(templ.SafeURL("/invoice/" + hash)) }
            hx-trigger="load delay:1s"
            hx-target="#modal"
            hx-swap="outerHTML"
            hx-select="#modal" />
    }
}

func format(msats int) string {
    sats := msats / 1000
    if sats == 1 {
        return fmt.Sprintf("%d sat", sats)
    }
    return fmt.Sprintf("%d sats", sats)
}