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 { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { useOfferActions } from '@/hooks/useMarketplaceOffers';
import { useSendDirectMessage } from '@/hooks/useDirectMessages';
import { useToast } from '@/hooks/useToast';
import { Handshake, Loader2 } from 'lucide-react';
import { useTranslation } from '@/contexts/language';

/** Buyer: make a structured offer (amount + note) on a listing. */
export function OfferDialog({
  open,
  onOpenChange,
  listing,
  title,
  sellerName,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  listing: { pubkey: string; identifier: string };
  title: string;
  sellerName: string;
}) {
  const { t } = useTranslation();
  const { createOffer } = useOfferActions();
  const { mutateAsync: sendDM } = useSendDirectMessage();
  const { toast } = useToast();
  const [amount, setAmount] = useState('');
  const [offerItem, setOfferItem] = useState('');
  const [note, setNote] = useState('');
  const [busy, setBusy] = useState(false);

  const submit = async () => {
    const parsed = amount.trim() ? Number(amount) : undefined;
    if (parsed !== undefined && (!Number.isFinite(parsed) || parsed <= 0)) {
      toast({ title: t('marketUi.offer.validAmount'), variant: 'destructive' });
      return;
    }
    if (!parsed && !offerItem.trim() && !note.trim()) {
      toast({ title: t('marketUi.offer.describeOffer'), description: t('marketUi.offer.describeOfferBody'), variant: 'destructive' });
      return;
    }
    setBusy(true);
    try {
      await createOffer({ listing, amount: parsed, currency: 'SATS', offerItem, note });

      // Best-effort nudge to the seller via NIP-17 DM — never fail the offer.
      try {
        const amountLine = parsed ? t('marketUi.offer.dmAmount', { amount: parsed.toLocaleString() }) : '';
        const itemLine = offerItem.trim() ? t('marketUi.offer.dmItem', { item: offerItem.trim() }) : '';
        const noteLine = note.trim() ? `\n\n“${note.trim()}”` : '';
        await sendDM({
          recipients: listing.pubkey,
          content: t('marketUi.offer.dmBody', { title, amount: amountLine, item: itemLine, note: noteLine }),
        });
      } catch {
        /* DM optional (no NIP-44 signer, etc.) */
      }

      toast({
        title: t('marketUi.offer.sent'),
        description: t('marketUi.offer.sentBody', { sellerName }),
      });
      onOpenChange(false);
      setAmount('');
      setOfferItem('');
      setNote('');
    } catch (e) {
      toast({
        title: t('marketUi.offer.sendFailed'),
        description: e instanceof Error ? e.message : t('marketUi.offer.somethingWrong'),
        variant: 'destructive',
      });
    } finally {
      setBusy(false);
    }
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="mx-4 max-w-[calc(100vw-2rem)] border-2 border-orange-500/40 bg-black sm:max-w-md">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2 text-white">
            <Handshake className="h-5 w-5 text-orange-400" /> {t('marketUi.offer.title')}
          </DialogTitle>
          <DialogDescription className="text-sm text-gray-400">
            {t('marketUi.offer.description', { sellerName })}
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="offer-amount" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.offer.amountLabel')}
            </Label>
            <Input
              id="offer-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="offer-item" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.offer.itemLabel')}
            </Label>
            <Input
              id="offer-item"
              value={offerItem}
              onChange={(e) => setOfferItem(e.target.value)}
              placeholder={t('marketUi.offer.itemPlaceholder')}
              className="h-11 border-gray-700 bg-gray-900 text-white"
            />
            <p className="text-[11px] text-gray-500">
              {t('marketUi.offer.itemHint')}
            </p>
          </div>
          <div className="space-y-2">
            <p className="text-[10px] font-black uppercase tracking-widest text-gray-500">
              {t('marketplaceExtrasUi.offerTemplates')}
            </p>
            <div className="flex flex-wrap gap-1.5">
              {[
                t('marketplaceExtrasUi.offerDiscount'),
                t('marketplaceExtrasUi.offerSwap'),
                t('marketplaceExtrasUi.offerPickup'),
                t('marketplaceExtrasUi.offerShipping'),
              ].map((template) => (
                <button
                  key={template}
                  type="button"
                  onClick={() => setNote(template)}
                  className="min-h-0 rounded-full border border-orange-500/25 bg-orange-500/5 px-2.5 py-1 text-[11px] text-orange-200 hover:bg-orange-500/15"
                >
                  {template}
                </button>
              ))}
            </div>
            <Label htmlFor="offer-note" className="text-xs uppercase tracking-wide text-gray-400">
              {t('marketUi.offer.messageLabel')}
            </Label>
            <Textarea
              id="offer-note"
              value={note}
              onChange={(e) => setNote(e.target.value)}
              rows={3}
              placeholder={t('marketUi.offer.messagePlaceholder')}
              className="border-gray-700 bg-gray-900 text-white"
            />
          </div>

          <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={busy}
              className="flex-1 gap-2 bg-orange-500 font-bold text-black hover:bg-orange-500/90"
            >
              {busy ? <Loader2 className="h-4 w-4 animate-spin" /> : <Handshake className="h-4 w-4" />}
              {t('marketUi.offer.send')}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}