import Link from "next/link";
import QRCode from "qrcode";
import { PaymentMethodType } from "@prisma/client";
import { auth } from "@/lib/auth";
import { buildPaymentUri } from "@/lib/payment-uri";
import { ProfileHeader } from "@/components/public/profile-header";
import { PaymentMethodCard } from "@/components/public/payment-method-card";
import { buttonStyles } from "@/components/ui/button";

const previewProfile = {
  displayName: "Your Name",
  username: "yourname",
  bio: "A public page where people can copy your payment details in one place.",
  avatarUrl: null,
};

const previewMethodsBase: Array<{
  id: string;
  type: PaymentMethodType;
  label: string;
  value: string;
  network: string | null;
  description: string | null;
  isVisible: boolean;
}> = [
  {
    id: "preview-monero",
    type: "BITCOIN",
    label: "Bitcoin",
    value: "bc1qrp8uudvq5rr5l0nuepkxvxayyny2ws2w0m8jz3",
    network: null,
    description: null,
    isVisible: true,
  },
  {
    id: "preview-paypal",
    type: "PAYPAL",
    label: "PayPal",
    value: "https://paypal.me/yourname",
    network: null,
    description: null,
    isVisible: true,
  },
];

const howItWorks = [
  "Create an account and choose your public username.",
  "Add payment methods and optional social/contact links.",
  "Share your profile URL so people can copy details or scan QR.",
];

const whyPayMe = [
  "No custody: PayMe does not hold funds.",
  "No processing: PayMe does not execute transactions.",
  "Self-hosted: run it on your own infrastructure.",
  "Open source: inspect and modify everything.",
  "Privacy-friendly: minimal profile data, no tracking layer built in.",
];

export default async function HomePage() {
  const session = await auth();
  const previewMethods = await Promise.all(
    previewMethodsBase.map(async (method) => {
      const qrPayload = buildPaymentUri(
        method.type,
        method.value,
        method.network,
      );
      let qrDataUrl: string | null = null;

      try {
        qrDataUrl = await QRCode.toDataURL(qrPayload, {
          margin: 1,
          width: 220,
        });
      } catch {
        qrDataUrl = null;
      }

      return {
        ...method,
        qrPayload,
        qrDataUrl,
      };
    }),
  );

  const primaryHref = session?.user ? "/dashboard" : "/register";
  const primaryLabel = session?.user ? "Open dashboard" : "Create your profile";

  return (
    <main className="terminal-shell md:px-8 md:py-16">
      <section className="space-y-7">
        <div className="space-y-4">
          <p className="terminal-heading">PayMe</p>
          <h1 className="max-w-3xl text-3xl font-semibold leading-tight md:text-5xl">
            One public page for every way people can pay you.
          </h1>
          <p className="max-w-3xl text-lg leading-relaxed text-muted">
            Self-hosted payment profile pages for creators, freelancers, and OSS
            maintainers. No custody. No transaction processing. Just clear
            payment details and links.
          </p>
        </div>

        <div className="flex flex-wrap items-center gap-3 md:gap-4">
          <Link
            href={primaryHref}
            className={buttonStyles({
              variant: "primary",
              className:
                "relative -top-1 min-h-[3.1rem] min-w-[13rem] justify-center px-6",
            })}
          >
            {primaryLabel}
          </Link>
          <a
            href="#example"
            className={buttonStyles({
              variant: "secondary",
              className:
                "relative -top-1 min-h-[3.1rem] min-w-[10.75rem] justify-center px-5",
            })}
            style={{ marginLeft: "14px" }}
          >
            View example
          </a>
        </div>
      </section>

      <section id="example" className="mt-8 space-y-5 md:mt-10">
        <div className="space-y-2">
          <h2 className="text-2xl font-bold">Profile preview</h2>
          <p className="text-sm text-muted">
            How a public PayMe profile is presented.
          </p>
        </div>

        <div className="space-y-8">
          <ProfileHeader
            displayName={previewProfile.displayName}
            username={previewProfile.username}
            bio={previewProfile.bio}
            avatarUrl={previewProfile.avatarUrl}
          />

          <section className="terminal-section space-y-4">
            <h3 className="terminal-heading">Payment Methods</h3>
            <div className="space-y-3">
              {previewMethods.map((method) => (
                <PaymentMethodCard key={method.id} method={method} />
              ))}
            </div>
          </section>
        </div>
      </section>

      <section className="terminal-section grid gap-5 md:grid-cols-2 md:gap-6 md:pt-10">
        <div className="terminal-card space-y-4 md:p-6">
          <h2 className="text-2xl font-bold">How it works</h2>
          <ol className="list-decimal space-y-3 pl-5 text-sm leading-relaxed text-muted">
            {howItWorks.map((item) => (
              <li key={item}>{item}</li>
            ))}
          </ol>
        </div>

        <div className="terminal-card space-y-4 md:p-6">
          <h2 className="text-2xl font-bold">Why PayMe</h2>
          <ul className="list-none space-y-3 p-0 text-sm leading-relaxed text-muted">
            {whyPayMe.map((item) => (
              <li key={item}>{item}</li>
            ))}
          </ul>
        </div>
      </section>
    </main>
  );
}