"use client";

import Image from "next/image";
import { useEffect, useMemo, useState } from "react";
import QRCode from "qrcode";

import { formatUsdAmount, formatXmrAmount } from "../lib/formatting";
import { useXmrUsdRate } from "../lib/use-xmr-usd-rate";

type InvoicePaymentDetailsProps = {
  address: string;
  amount: string;
  hasDetectedPayment: boolean;
  status: "pending" | "payment_detected" | "confirmed" | "expired" | "invalid";
  confirmationTarget: number;
  qrLogoMode?: "monero" | "none" | "custom" | null;
  qrLogoDataUrl?: string | null;
};

const buildMoneroUri = (address: string, amount: string) => {
  const params = new URLSearchParams();
  params.set("tx_amount", amount);
  return `monero:${address}?${params.toString()}`;
};

export default function InvoicePaymentDetails({
  address,
  amount,
  hasDetectedPayment,
  status,
  confirmationTarget,
  qrLogoMode,
  qrLogoDataUrl,
}: InvoicePaymentDetailsProps) {
  const [qrDataUrl, setQrDataUrl] = useState<string | null>(null);
  const [copiedField, setCopiedField] = useState<string | null>(null);
  const { rate: usdRate } = useXmrUsdRate();
  const isInvalid = status === "invalid";
  const shouldPromptPayment = !hasDetectedPayment && !isInvalid;
  const formattedAmount = useMemo(() => formatXmrAmount(amount), [amount]);
  const uri = useMemo(
    () => buildMoneroUri(address, formattedAmount),
    [address, formattedAmount]
  );
  const amountValue = useMemo(() => {
    const parsed = Number.parseFloat(amount);
    return Number.isFinite(parsed) ? parsed : null;
  }, [amount]);
  const usdEstimate = useMemo(() => {
    if (!usdRate || amountValue === null || amountValue <= 0) {
      return null;
    }
    return formatUsdAmount(usdRate * amountValue);
  }, [usdRate, amountValue]);

  const handleCopy = async (value: string, field: string) => {
    try {
      await navigator.clipboard.writeText(value);
      setCopiedField(field);
      window.setTimeout(() => {
        setCopiedField((current) => (current === field ? null : current));
      }, 1500);
    } catch {
      setCopiedField(null);
    }
  };

  useEffect(() => {
    let active = true;
    const size = 200;
    const canvas = document.createElement("canvas");
    QRCode.toCanvas(canvas, uri, {
      margin: 1,
      width: size,
      errorCorrectionLevel: "H",
    })
      .then(() => {
        const context = canvas.getContext("2d");
        if (!context) {
          return null;
        }
        const mode = qrLogoMode ?? "monero";
        const wantsLogo = mode !== "none";
        if (wantsLogo) {
          const blankSize = Math.round(size * 0.28);
          const blankOffset = Math.round((size - blankSize) / 2);
          context.fillStyle = "#ffffff";
          context.fillRect(blankOffset, blankOffset, blankSize, blankSize);
        }
        return canvas.toDataURL();
      })
      .then((url) => {
        if (active) {
          setQrDataUrl(url ?? null);
        }
      })
      .catch(() => {
        if (active) {
          setQrDataUrl(null);
        }
      });
    return () => {
      active = false;
    };
  }, [uri, qrLogoMode]);

  const resolvedQrLogoMode = qrLogoMode ?? "monero";
  const resolvedLogoSrc =
    resolvedQrLogoMode === "custom"
      ? qrLogoDataUrl
      : resolvedQrLogoMode === "monero"
        ? "/monero-logo.svg"
        : null;

  return (
    <details
      className="group rounded-2xl border border-stroke bg-card p-8 shadow-card backdrop-blur"
      open={shouldPromptPayment}
    >
      <summary className="cursor-pointer list-none [&::-webkit-details-marker]:hidden">
        <div className="flex flex-wrap items-start justify-between gap-4">
          <div>
            <p className="text-xs font-semibold uppercase tracking-[0.2em] text-clay">
              Payment details
            </p>
            <h2 className="mt-2 font-serif text-2xl">
              {isInvalid
                ? "Invoice marked invalid. Do not send payment."
                : hasDetectedPayment
                  ? status === "confirmed"
                    ? `Payment confirmed on-chain at ${confirmationTarget} confirmations.`
                    : "Payment detected. Confirmations are in progress."
                  : "Send the exact amount to this address."}
            </h2>
          </div>
          <span className="rounded-full border border-stroke bg-white/70 px-3 py-1 text-[0.7rem] font-semibold uppercase tracking-[0.12em] text-ink-soft transition group-open:hidden">
            Show details
          </span>
          <span className="hidden rounded-full border border-stroke bg-white/70 px-3 py-1 text-[0.7rem] font-semibold uppercase tracking-[0.12em] text-ink-soft transition group-open:inline-flex">
            Hide details
          </span>
        </div>
      </summary>
      <div className="mt-6 grid gap-6 lg:grid-cols-2">
        <div className="rounded-2xl border border-stroke bg-white/60 p-5 shadow-soft">
          <div className="flex items-center justify-between gap-3">
            <p className="text-xs font-semibold uppercase tracking-[0.2em] text-ink-soft">
              Amount (XMR)
            </p>
            <button
              className="rounded-full border border-stroke bg-white/70 px-3 py-1 text-[0.7rem] font-semibold uppercase tracking-[0.12em] text-ink-soft transition hover:bg-white"
              type="button"
              onClick={() => handleCopy(formattedAmount, "amount")}
            >
              {copiedField === "amount" ? "Copied" : "Copy"}
            </button>
          </div>
          <p className="mt-3 text-2xl font-semibold text-ink">{formattedAmount}</p>
          <p className="mt-2 text-sm text-ink-soft">
            Your wallet adds the network fee on top. Do not subtract it from the
            amount shown.
          </p>
          {usdEstimate ? (
            <>
              <p className="mt-2 text-sm text-ink-soft">
                Approx. USD reference: ~{usdEstimate}
              </p>
              <details className="mt-1 w-fit text-xs text-ink-soft">
                <summary className="cursor-pointer select-none underline underline-offset-4">
                  About this estimate
                </summary>
                <p className="mt-2 max-w-[46ch] leading-relaxed">
                  Reference only, uses CoinGecko spot rate. Not a quote or guarantee.
                </p>
              </details>
            </>
          ) : null}
        </div>
        <div className="rounded-2xl border border-stroke bg-white/60 p-5 shadow-soft">
          <div className="flex items-center justify-between gap-3">
            <p className="text-xs font-semibold uppercase tracking-[0.2em] text-ink-soft">
              Payment address
            </p>
            <button
              className="rounded-full border border-stroke bg-white/70 px-3 py-1 text-[0.7rem] font-semibold uppercase tracking-[0.12em] text-ink-soft transition hover:bg-white"
              type="button"
              onClick={() => handleCopy(address, "address")}
            >
              {copiedField === "address" ? "Copied" : "Copy"}
            </button>
          </div>
          <p className="mt-3 break-words rounded-xl bg-ink/10 px-3 py-2 font-mono text-xs text-ink sm:text-sm">
            {address}
          </p>
        </div>
      </div>
      <div className="mt-6 rounded-2xl border border-stroke bg-white/60 p-5 shadow-soft">
        <div className="flex items-center justify-between gap-3">
          <p className="text-xs font-semibold uppercase tracking-[0.2em] text-ink-soft">
            Payment request URI
          </p>
          <button
            className="rounded-full border border-stroke bg-white/70 px-3 py-1 text-[0.7rem] font-semibold uppercase tracking-[0.12em] text-ink-soft transition hover:bg-white"
            type="button"
            onClick={() => handleCopy(uri, "uri")}
          >
            {copiedField === "uri" ? "Copied" : "Copy"}
          </button>
        </div>
        <p className="mt-3 break-words rounded-xl bg-ink/10 px-3 py-2 font-mono text-xs text-ink sm:text-sm">
          {uri}
        </p>
        {shouldPromptPayment ? (
          <p className="mt-4 text-sm text-ink-soft">
            After you pay, this page updates automatically once the payment is
            detected on-chain.
          </p>
        ) : null}
      </div>
      <div className="mt-6 grid gap-4 lg:grid-cols-[minmax(0,1fr)_auto] lg:items-center">
        <p className="max-w-xl text-sm text-ink-soft">
          {isInvalid
            ? "This invoice is marked invalid. Do not send a payment to this address."
            : hasDetectedPayment
              ? "Details remain available if you need to reference the address or request URI."
              : "Tip: use the QR or payment request URI to avoid copy errors."}
        </p>
        {qrDataUrl ? (
          <div className="relative h-[200px] w-[200px] rounded-2xl border border-stroke bg-white p-2 shadow-soft">
            <Image
              className="h-full w-full rounded-xl border border-ink/10 bg-white"
              src={qrDataUrl}
              alt="Payment request QR"
              width={200}
              height={200}
              unoptimized
            />
            {resolvedLogoSrc ? (
              <div className="pointer-events-none absolute inset-0 flex items-center justify-center">
                <span className="flex h-12 w-12 items-center justify-center rounded-full bg-white shadow-[0_6px_12px_rgba(16,18,23,0.18)]">
                  <Image
                    src={resolvedLogoSrc}
                    alt="QR logo"
                    width={32}
                    height={32}
                    unoptimized={resolvedQrLogoMode === "custom"}
                  />
                </span>
              </div>
            ) : null}
          </div>
        ) : null}
      </div>
    </details>
  );
}