import { useState } from 'react';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { useCashuEscrow } from '@/hooks/wallet/useCashuEscrow';
import { useEscrowPrefs } from '@/hooks/wallet/useEscrowPrefs';
import { useAuthor } from '@/hooks/useAuthor';
import { useTradeAttestationRequest } from '@/hooks/useTradeAttestations';
import { useToast } from '@/hooks/useToast';
import { ESCROW_MIN_LOCK_DAYS, mintSupportsP2PK } from '@/lib/cashuEscrow';
import { savePendingEscrow, clearPendingEscrow } from '@/lib/pendingEscrow';
import { Loader2, Lock } from 'lucide-react';
import { useTranslation } from '@/contexts/language';

/**
 * Buyer: lock funds in Cashu escrow (P2PK to the seller, refundable after a
 * deadline) and send the `31872` confirmation request carrying the token.
 *
 * Native-only (the Cashu wallet is Capacitor-gated). EXPERIMENTAL — the
 * mint-touching path has not been verified on a device; start with small
 * amounts.
 */
export function EscrowRequestDialog({
  open,
  onOpenChange,
  listing,
  sellerPubkey,
  sellerName,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  listing: { pubkey: string; identifier: string };
  sellerPubkey: string;
  sellerName: string;
}) {
  const { t } = useTranslation();
  const escrow = useCashuEscrow();
  const { prefs } = useEscrowPrefs();
  const { publishRequest, isPending: publishing } = useTradeAttestationRequest();
  const { toast } = useToast();

  const [amount, setAmount] = useState('');
  const [days, setDays] = useState(String(prefs.defaultLockDays));
  const [busy, setBusy] = useState(false);
  // Buyer-facing mint choice: default to their preference, else the first trusted
  // mint. Shown explicitly so the buyer knows where the funds will be locked.
  const [mintChoice, setMintChoice] = useState('');
  const sellerAuthor = useAuthor(sellerPubkey);
  const sellerMintRaw = (sellerAuthor.data?.metadata as Record<string, unknown> | undefined)?.cashu_mint;
  const sellerMint =
    typeof sellerMintRaw === 'string' && sellerMintRaw.trim() ? sellerMintRaw.trim() : undefined;
  const mintOptions = escrow.mints;
  // Include the seller's advertised mint even if it is not in our trust list, and
  // prefer it — a mint the seller actually uses is one they can redeem from.
  const mintChoices =
    sellerMint && !mintOptions.some((m) => m.url === sellerMint)
      ? [...mintOptions, { url: sellerMint }]
      : mintOptions;
  const effectiveMint = mintChoice || sellerMint || prefs.preferredMintUrl || mintChoices[0]?.url || '';
  const p2pkBlocked =
    mintSupportsP2PK(mintChoices.find((m) => m.url === effectiveMint)?.info) === false;

  const submit = async () => {
    const amountSats = parseInt(amount, 10);
    const lockDays = parseInt(days, 10);

    if (!Number.isFinite(amountSats) || amountSats <= 0) {
      toast({ title: t('marketUi.escrowRequest.enterAmount'), variant: 'destructive' });
      return;
    }
    if (!Number.isFinite(lockDays) || lockDays < ESCROW_MIN_LOCK_DAYS) {
      toast({ title: t('marketUi.escrowRequest.minLock', { days: ESCROW_MIN_LOCK_DAYS }), variant: 'destructive' });
      return;
    }

    setBusy(true);
    let mintedToken: string | undefined;
    try {
      const { token } = await escrow.createEscrow({ amountSats, sellerPubkey, lockDays, mintUrl: effectiveMint || undefined });
      mintedToken = token;
      // Persist BEFORE publishing: if the request fails to send, the P2PK-locked
      // funds stay recoverable from this device instead of being lost.
      savePendingEscrow(listing, token, amountSats, lockDays);
      await publishRequest({
        listing,
        attestor: sellerPubkey,
        cashuToken: token,
        note: t('marketUi.escrowRequest.requestNote', { amount: amountSats }),
      });
      clearPendingEscrow(listing);
      toast({
        title: t('marketUi.escrowRequest.created'),
        description: t('marketUi.escrowRequest.createdBody', { amount: amountSats, days: lockDays, sellerName }),
      });
      onOpenChange(false);
    } catch (e) {
      toast({
        title: t('marketUi.escrowRequest.createFailed'),
        description: mintedToken
          ? t('marketUi.escrowRequest.lockedNotSent')
          : e instanceof Error ? e.message : t('marketUi.escrowRequest.somethingWrong'),
        variant: 'destructive',
      });
    } finally {
      setBusy(false);
    }
  };

  const pending = busy || publishing;

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="mx-4 max-w-[calc(100vw-2rem)] border-2 border-[#ff6600]/40 bg-black sm:max-w-md">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-white">
            <Lock className="h-5 w-5 text-[#ff6600]" /> {t('marketUi.escrowRequest.title')}
          </DialogTitle>
          <DialogDescription className="text-sm text-gray-400">
            {t('marketUi.escrowRequest.description', { sellerName })}
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="escrow-amount" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.escrowRequest.amountLabel')}
            </Label>
            <Input
              id="escrow-amount"
              value={amount}
              onChange={(e) => setAmount(e.target.value)}
              inputMode="numeric"
              placeholder={t('marketUi.offer.amountPlaceholder')}
              className="h-11 border-gray-700 bg-gray-900 text-white"
            />
          </div>

          <div className="space-y-2">
            <Label htmlFor="escrow-mint" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.escrowRequest.mintLabel')}
            </Label>
            <select
              id="escrow-mint"
              value={effectiveMint}
              onChange={(e) => setMintChoice(e.target.value)}
              className="h-11 w-full rounded-md border border-gray-700 bg-gray-900 px-3 text-sm text-white"
            >
              {mintChoices.length === 0 && (
                <option value="">{t('marketUi.escrowRequest.noMints')}</option>
              )}
              {mintChoices.map((m) => (
                <option key={m.url} value={m.url}>
                  {m.url.replace(/^https?:\/\//, '')}
                </option>
              ))}
            </select>
            <p className="text-[11px] text-gray-500">{t('marketUi.escrowRequest.mintHint')}</p>
            {sellerMint && (
              <p className="text-[11px] text-[#ccff00]">
                {t('marketUi.escrowRequest.sellerMintHint')}
              </p>
            )}
          </div>

          <div className="space-y-2">
            <Label htmlFor="escrow-days" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.escrowRequest.daysLabel')}
            </Label>
            <Input
              id="escrow-days"
              value={days}
              onChange={(e) => setDays(e.target.value)}
              inputMode="numeric"
              className="h-11 border-gray-700 bg-gray-900 text-white"
            />
            <p className="text-[11px] text-gray-500">
              {t('marketUi.escrowRequest.daysHint')}
            </p>
          </div>

          {!escrow.available && (
            <p className="text-xs text-amber-400">
              {t('marketUi.escrowRequest.nativeOnly')}
            </p>
          )}
          {p2pkBlocked && (
            <p className="text-xs text-amber-400">{t('marketUi.escrowRequest.p2pkUnsupported')}</p>
          )}

          <div className="flex gap-2 pt-1">
            <Button variant="outline" onClick={() => onOpenChange(false)} className="flex-1 border-white/15">
              {t('common.cancel')}
            </Button>
            <Button
              onClick={submit}
              disabled={pending || !escrow.available || p2pkBlocked}
              className="flex-1 gap-2 bg-[#ff6600] font-bold text-black hover:bg-[#ff6600]/90"
            >
              {pending ? <Loader2 className="h-4 w-4 animate-spin" /> : <Lock className="h-4 w-4" />}
              {t('marketUi.escrowRequest.lockAndRequest')}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}