'use client';

import { useCallback, useMemo, useState } from 'react';
import { AnimatePresence, motion, useMotionValue, useTransform } from 'motion/react';
import { Check, MapPin, Star, X } from 'lucide-react';
import type { DeckCard } from '@linkder/db';
import { cn, formatDistance, formatResponseTime } from '@/lib/utils';

/** Horizontal drag past this many pixels commits the swipe. */
const COMMIT_PX = 110;

export interface DeckProps {
  cards: DeckCard[];
  onDecide: (proId: string, direction: 'left' | 'right') => void | Promise<void>;
}

export function Deck({ cards, onDecide }: DeckProps) {
  const [index, setIndex] = useState(0);
  const remaining = useMemo(() => cards.slice(index), [cards, index]);

  const decide = useCallback(
    (proId: string, direction: 'left' | 'right') => {
      setIndex((i) => i + 1);
      void onDecide(proId, direction);
    },
    [onDecide],
  );

  if (remaining.length === 0) {
    return <EmptyDeck />;
  }

  // Only the top three are mounted — the rest are just a visual stack.
  const visible = remaining.slice(0, 3);

  return (
    <div className="flex flex-col items-center gap-6">
      <div className="relative h-[560px] w-full max-w-sm">
        <AnimatePresence initial={false}>
          {visible
            .map((card, i) => (
              <Card
                key={card.proId}
                card={card}
                depth={i}
                onDecide={i === 0 ? decide : undefined}
              />
            ))
            .reverse()}
        </AnimatePresence>
      </div>

      <div className="flex items-center gap-5">
        <ActionButton
          label="Not this one"
          variant="pass"
          onClick={() => visible[0] && decide(visible[0].proId, 'left')}
        />
        <p className="w-28 text-center text-sm text-[var(--muted)] tabular-nums">
          {remaining.length} left
        </p>
        <ActionButton
          label="Send this job"
          variant="hire"
          onClick={() => visible[0] && decide(visible[0].proId, 'right')}
        />
      </div>
    </div>
  );
}

function Card({
  card,
  depth,
  onDecide,
}: {
  card: DeckCard;
  depth: number;
  onDecide?: (proId: string, direction: 'left' | 'right') => void;
}) {
  const x = useMotionValue(0);
  const rotate = useTransform(x, [-300, 0, 300], [-14, 0, 14]);
  const hireOpacity = useTransform(x, [40, COMMIT_PX], [0, 1]);
  const passOpacity = useTransform(x, [-COMMIT_PX, -40], [1, 0]);

  const interactive = Boolean(onDecide);

  return (
    <motion.article
      className={cn(
        'deck-card absolute inset-0 overflow-hidden rounded-3xl border shadow-xl',
        'border-[var(--border)] bg-[var(--card)]',
        interactive ? 'cursor-grab active:cursor-grabbing' : 'pointer-events-none',
      )}
      style={{ x, rotate, zIndex: 10 - depth }}
      initial={{ scale: 0.94, y: 14 * depth, opacity: depth === 2 ? 0 : 1 }}
      animate={{ scale: 1 - depth * 0.04, y: 14 * depth, opacity: 1 }}
      exit={{
        x: x.get() > 0 ? 400 : -400,
        opacity: 0,
        transition: { duration: 0.2 },
      }}
      drag={interactive ? 'x' : false}
      dragConstraints={{ left: 0, right: 0 }}
      dragElastic={0.6}
      onDragEnd={(_, info) => {
        if (!onDecide) return;
        if (info.offset.x > COMMIT_PX) onDecide(card.proId, 'right');
        else if (info.offset.x < -COMMIT_PX) onDecide(card.proId, 'left');
      }}
    >
      {/* eslint-disable-next-line @next/next/no-img-element */}
      <img
        src={card.photos[0] ?? '/placeholder-pro.jpg'}
        alt=""
        className="absolute inset-0 h-full w-full object-cover"
        draggable={false}
      />
      <div className="absolute inset-0 bg-gradient-to-t from-black/85 via-black/25 to-transparent" />

      {interactive && (
        <>
          <motion.div
            style={{ opacity: hireOpacity }}
            className="absolute left-6 top-6 rotate-[-12deg] rounded-lg border-4 border-[var(--color-go-500)] px-3 py-1 text-2xl font-black tracking-wide text-[var(--color-go-500)]"
          >
            SEND JOB
          </motion.div>
          <motion.div
            style={{ opacity: passOpacity }}
            className="absolute right-6 top-6 rotate-[12deg] rounded-lg border-4 border-[var(--color-stop-500)] px-3 py-1 text-2xl font-black tracking-wide text-[var(--color-stop-500)]"
          >
            PASS
          </motion.div>
        </>
      )}

      <div className="absolute inset-x-0 bottom-0 p-6 text-white">
        <div className="mb-1 flex items-baseline gap-2">
          <h2 className="text-2xl font-semibold">{card.name}</h2>
          {card.ratingCount > 0 ? (
            <span className="flex items-center gap-1 text-sm">
              <Star className="h-4 w-4 fill-current" aria-hidden />
              {card.ratingAvg?.toFixed(1)}
              <span className="text-white/60">({card.ratingCount})</span>
            </span>
          ) : (
            <span className="rounded-full bg-white/20 px-2 py-0.5 text-xs font-medium">New</span>
          )}
        </div>

        <p className="text-sm text-white/80">{card.headline}</p>

        <div className="mt-3 flex flex-wrap items-center gap-x-4 gap-y-1 text-sm text-white/70">
          <span className="flex items-center gap-1">
            <MapPin className="h-4 w-4" aria-hidden />
            {formatDistance(card.distanceM)}
          </span>
          <span>€{(card.hourlyRateCents / 100).toFixed(0)}/hr</span>
          {card.completedJobs > 0 && <span>{card.completedJobs} jobs done</span>}
        </div>

        {formatResponseTime(card.avgResponseMinutes) && (
          <p className="mt-1 text-xs text-white/60">
            {formatResponseTime(card.avgResponseMinutes)}
          </p>
        )}

        <p className="mt-3 line-clamp-2 text-sm text-white/75">{card.bio}</p>
      </div>
    </motion.article>
  );
}

function ActionButton({
  label,
  variant,
  onClick,
}: {
  label: string;
  variant: 'pass' | 'hire';
  onClick: () => void;
}) {
  const isHire = variant === 'hire';
  const Icon = isHire ? Check : X;
  return (
    <button
      type="button"
      onClick={onClick}
      aria-label={label}
      title={label}
      className={cn(
        'flex h-16 w-16 items-center justify-center rounded-full border-2 bg-[var(--card)] shadow-lg',
        'transition hover:scale-105 active:scale-95',
        isHire
          ? 'border-[var(--color-go-500)] text-[var(--color-go-500)]'
          : 'border-[var(--color-stop-500)] text-[var(--color-stop-500)]',
      )}
    >
      <Icon className="h-7 w-7" strokeWidth={3} aria-hidden />
    </button>
  );
}

function EmptyDeck() {
  return (
    <div className="mx-auto flex h-[560px] max-w-sm flex-col items-center justify-center gap-3 rounded-3xl border border-dashed border-[var(--border)] p-8 text-center">
      <h2 className="text-lg font-semibold">That&rsquo;s everyone nearby</h2>
      <p className="text-sm text-[var(--muted)]">
        You&rsquo;ve seen every verified pro who covers your area for this trade. We&rsquo;ll notify
        you the moment a new one joins.
      </p>
    </div>
  );
}