/**
 * SasquatchProDialog — the "Upgrade to Sasquatch Pro" sheet.
 *
 * Shows the supporter tiers, the perk list, and handles Lightning payment
 * (auto via NWC/WebLN, or a QR fallback). Framed as supporting a free,
 * no-ads, community-funded app — Pro is the thank-you.
 */

import { useEffect, useState } from 'react';
import QRCode from 'qrcode';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useSasquatchPro } from '@/hooks/useSasquatchPro';
import { usePurchasePro } from '@/hooks/usePurchasePro';
import { useToast } from '@/hooks/useToast';
import { PRO_TIERS, PRO_LIGHTNING_ADDRESS, type ProTier } from '@/lib/sasquatchPro';
import {
  Zap,
  Check,
  Loader2,
  Copy,
  Brain,
  Wand2,
  Rocket,
  BadgeCheck,
} from 'lucide-react';

const PERKS: Array<{ icon: React.ComponentType<{ className?: string }>; text: string }> = [
  { icon: Brain, text: 'Personal assistant — Sasquatch reads your own Stash, crews, spots & listings' },
  { icon: Wand2, text: 'Action drafts: list gear, post a spot status, plan a trip — you confirm before anything publishes' },
  { icon: Rocket, text: 'Answers use your personal context, not just public data' },
  { icon: BadgeCheck, text: '⚡ Directly support SkateSpots & keep it free and ad-free' },
];

export function SasquatchProDialog({
  open,
  onOpenChange,
}: {
  open: boolean;
  onOpenChange: (v: boolean) => void;
}) {
  const { user } = useCurrentUser();
  const { isPro, expiresAt } = useSasquatchPro();
  const { toast } = useToast();
  const purchase = usePurchasePro();

  const [selected, setSelected] = useState<ProTier>(
    PRO_TIERS.find((t) => t.popular) ?? PRO_TIERS[1],
  );
  const [qr, setQr] = useState<string | null>(null);

  // Render a QR whenever we fall back to manual payment.
  useEffect(() => {
    let active = true;
    if (purchase.invoice) {
      QRCode.toDataURL(purchase.invoice.toUpperCase(), { width: 280, margin: 1 })
        .then((url) => { if (active) setQr(url); })
        .catch(() => setQr(null));
    } else {
      setQr(null);
    }
    return () => { active = false; };
  }, [purchase.invoice]);

  // Toast + close on success.
  useEffect(() => {
    if (purchase.state === 'paid') {
      toast({ title: 'Welcome to Sasquatch Pro! 🦧⚡', description: 'Your pass is active — a receipt just landed in your DMs. Thanks for keeping the streets free.' });
      const t = setTimeout(() => { onOpenChange(false); purchase.reset(); }, 1400);
      return () => clearTimeout(t);
    }
  }, [purchase.state, toast, onOpenChange, purchase]);

  const copyInvoice = () => {
    if (purchase.invoice) {
      navigator.clipboard.writeText(purchase.invoice);
      toast({ title: 'Invoice copied' });
    }
  };

  const busy = purchase.state === 'preparing';
  const manual = purchase.state === 'awaiting_payment' && !!purchase.invoice;

  return (
    <Dialog open={open} onOpenChange={(v) => { onOpenChange(v); if (!v) purchase.reset(); }}>
      <DialogContent className="max-w-md bg-black border-red-500/30 text-white max-h-[90vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-xl font-black">
            <span className="text-2xl">🦧</span> Sasquatch <span className="text-red-500">Pro</span>
          </DialogTitle>
          <DialogDescription className="text-gray-400">
            Supercharge your AI skate guide. 100% funds a free, no-ads community app.
          </DialogDescription>
        </DialogHeader>

        {isPro ? (
          // ── Already Pro ─────────────────────────────────────────────────
          <div className="space-y-4 py-2">
            <div className="rounded-2xl border border-[#ccff00]/30 bg-[#ccff00]/10 p-4 text-center">
              <BadgeCheck className="mx-auto mb-2 h-8 w-8 text-[#ccff00]" />
              <p className="font-black text-[#ccff00]">You're a Pro supporter ⚡</p>
              {expiresAt && (
                <p className="mt-1 text-xs text-gray-300">
                  Active until {new Date(expiresAt * 1000).toLocaleDateString()}
                </p>
              )}
            </div>
            <div className="space-y-2">
              {PERKS.map((p) => (
                <div key={p.text} className="flex items-start gap-2 text-sm text-gray-300">
                  <Check className="mt-0.5 h-4 w-4 shrink-0 text-[#ccff00]" />
                  {p.text}
                </div>
              ))}
            </div>
            <p className="text-center text-xs text-gray-500">
              Want to extend? Pick a tier below to add more time.
            </p>
            <TierPicker selected={selected} onSelect={setSelected} />
            <PayButton tier={selected} busy={busy} onPay={() => purchase.purchase(selected)} extend />
          </div>
        ) : manual ? (
          // ── Manual QR payment ───────────────────────────────────────────
          <div className="space-y-4 py-2 text-center">
            <p className="text-sm text-gray-300">
              Scan to pay <span className="font-black text-white">{selected.sats.toLocaleString()} sats</span> for {selected.label} of Pro
            </p>
            {qr && <img src={qr} alt="Lightning invoice QR" className="mx-auto rounded-xl bg-white p-2" width={240} height={240} />}
            <div className="flex gap-2">
              <Button variant="outline" className="flex-1 gap-2 border-white/15" onClick={copyInvoice}>
                <Copy className="h-4 w-4" /> Copy invoice
              </Button>
              <Button
                className="flex-1 gap-2 bg-[#ccff00] text-black hover:bg-[#d4ff1a] font-bold"
                onClick={() => purchase.confirmManual(selected)}
              >
                <Check className="h-4 w-4" /> I've paid
              </Button>
            </div>
            <p className="text-[11px] text-gray-400">
              Paying to{' '}
              <span className="font-mono text-gray-200">⚡ {PRO_LIGHTNING_ADDRESS}</span>
            </p>
            <p className="text-[11px] text-gray-500">
              Tap "I've paid" after your wallet confirms — this records your pass to your Nostr identity.
            </p>
          </div>
        ) : (
          // ── Purchase flow ───────────────────────────────────────────────
          <div className="space-y-4 py-2">
            <div className="space-y-2">
              {PERKS.map((p) => (
                <div key={p.text} className="flex items-start gap-2.5 text-sm text-gray-200">
                  <p.icon className="mt-0.5 h-4 w-4 shrink-0 text-red-400" />
                  {p.text}
                </div>
              ))}
            </div>

            <div className="rounded-xl border border-white/10 bg-white/[0.03] p-3 text-xs text-gray-400">
              Free Sasquatch stays free — public spot/event/coach search + the full
              trick glossary. Pro adds the <span className="text-white font-semibold">personal + action</span> layer.
            </div>

            <TierPicker selected={selected} onSelect={setSelected} />

            {!user && (
              <p className="text-center text-xs text-amber-400">Log in first to upgrade.</p>
            )}
            {purchase.error && (
              <p className="text-center text-xs text-red-400">{purchase.error}</p>
            )}

            <PayButton tier={selected} busy={busy} onPay={() => purchase.purchase(selected)} disabled={!user} />

            <p className="text-center text-[11px] text-gray-500">
              Pays to <span className="font-mono text-gray-300">⚡ {PRO_LIGHTNING_ADDRESS}</span> over Lightning. Bound to your npub.
            </p>
          </div>
        )}
      </DialogContent>
    </Dialog>
  );
}

function TierPicker({ selected, onSelect }: { selected: ProTier; onSelect: (t: ProTier) => void }) {
  return (
    <div className="grid grid-cols-2 gap-2">
      {PRO_TIERS.map((t) => {
        const active = t.id === selected.id;
        return (
          <button
            key={t.id}
            onClick={() => onSelect(t)}
            className={cn(
              'relative rounded-xl border p-3 text-left transition-all',
              active
                ? 'border-red-500 bg-red-500/15'
                : 'border-white/10 bg-white/[0.02] hover:border-white/25',
            )}
          >
            {t.popular && (
              <span className="absolute -top-2 right-2 rounded-full bg-red-500 px-1.5 py-0.5 text-[8px] font-black uppercase text-white">
                Popular
              </span>
            )}
            <p className="text-sm font-black text-white">{t.label}</p>
            <p className="text-lg font-black text-red-400">{t.sats.toLocaleString()}<span className="ml-0.5 text-xs text-gray-500">sats</span></p>
            <p className="text-[10px] text-gray-500">{t.usd}{t.badge ? ` · ${t.badge}` : ''}</p>
          </button>
        );
      })}
    </div>
  );
}

function PayButton({
  tier,
  busy,
  disabled,
  extend,
  onPay,
}: {
  tier: ProTier;
  busy: boolean;
  disabled?: boolean;
  extend?: boolean;
  onPay: () => void;
}) {
  return (
    <Button
      className="w-full gap-2 bg-red-500 hover:bg-red-600 font-black uppercase tracking-wide h-12"
      onClick={onPay}
      disabled={busy || disabled}
    >
      {busy ? <Loader2 className="h-5 w-5 animate-spin" /> : <Zap className="h-5 w-5" />}
      {extend ? 'Extend' : 'Go Pro'} · {tier.sats.toLocaleString()} sats
    </Button>
  );
}