'use client';

import { motion } from 'motion/react';
import Link from 'next/link';
import { useParams } from 'next/navigation';
import { useState } from 'react';
import useSWR from 'swr';
import { profileUrl, type ProfileDTO } from '@musicshare/shared';
import { Avatar } from '@/components/Avatar';
import { NowPlayingCard } from '@/components/NowPlayingCard';
import { ProfileMenu } from '@/components/ProfileMenu';
import { QrCode } from '@/components/QrCode';
import { RecentPlays } from '@/components/RecentPlays';
import { TrackCard } from '@/components/TrackCard';
import { api, fetcher, useMe } from '@/lib/api';
import { useRealtime } from '@/lib/useRealtime';

export function ProfileClient() {
  const { username } = useParams<{ username: string }>();
  const { me } = useMe();
  const { data: profile, error, mutate } = useSWR<ProfileDTO>(`/users/${username}`, fetcher);
  const [busy, setBusy] = useState(false);
  const [showQr, setShowQr] = useState(false);

  // Live updates arrive for people you follow (and yourself)
  useRealtime(Boolean(me), (msg) => {
    if (msg.type === 'now_playing' && profile && msg.data.user.id === profile.user.id) {
      // A new track moves the previous one into "Recently played", so refetch; otherwise patch in place.
      const newTrack = msg.data.track.id !== profile.nowPlaying?.track.id;
      mutate({ ...profile, nowPlaying: msg.data }, { revalidate: newTrack });
    }
  });

  if (error) return <p className="muted">User not found.</p>;
  if (!profile) return null;

  const togglePin = async () => {
    setBusy(true);
    try {
      await api(`/users/${username}/pin`, { method: profile.isPinned ? 'DELETE' : 'PUT', body: profile.isPinned ? undefined : {} });
      await mutate();
    } catch (err) {
      alert((err as Error).message);
    }
    setBusy(false);
  };

  const toggleFollow = async () => {
    setBusy(true);
    await api(`/users/${username}/follow`, { method: profile.isFollowing ? 'DELETE' : 'POST', body: {} });
    await mutate();
    setBusy(false);
  };

  const { user } = profile;
  const preferred = me?.preferredService;

  return (
    <div className="stack">
      <motion.section
        className="profile-header"
        initial={{ opacity: 0, y: 16 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.5, ease: [0.22, 1, 0.36, 1] }}
      >
        <Avatar user={user} size={96} live={Boolean(profile.nowPlaying?.isPlaying)} />
        <div>
          <h1>{user.displayName ?? user.username}</h1>
          <div className="muted">
            @{user.username}
            {profile.followsYou && !profile.isSelf && <span className="chip-small">Follows you</span>}
          </div>
        </div>
        <div className="stats">
          <Link href={`/u/${user.username}/followers`}>
            <strong>{profile.followerCount}</strong> {profile.followerCount === 1 ? 'follower' : 'followers'}
          </Link>
          <Link href={`/u/${user.username}/following`}>
            <strong>{profile.followingCount}</strong> following
          </Link>
        </div>
        {user.bio && <p className="bio">{user.bio}</p>}
        {profile.isSelf ? (
          <div className="row">
            <button className="btn" onClick={() => setShowQr((v) => !v)}>
              {showQr ? 'Hide QR code' : 'Show QR code'}
            </button>
            <Link href="/settings" className="btn">
              Edit profile
            </Link>
          </div>
        ) : me ? (
          <div className="row">
            {profile.isFollowing && (
              <button className="btn" onClick={togglePin} disabled={busy}>
                {profile.isPinned ? '★ Pinned' : '☆ Pin'}
              </button>
            )}
            {!profile.isBlocked && (
              <button className={`btn ${profile.isFollowing ? '' : 'btn-primary'}`} onClick={toggleFollow} disabled={busy}>
                {profile.isFollowing ? 'Following' : profile.followsYou ? 'Follow back' : 'Follow'}
              </button>
            )}
            <ProfileMenu profile={profile} onChanged={() => mutate()} />
          </div>
        ) : (
          <Link href="/register" className="btn btn-primary">
            Sign up to follow
          </Link>
        )}
      </motion.section>

      {profile.isBlocked && (
        <p className="card muted">
          You blocked @{user.username}. They can&apos;t see your profile or what you play, and you won&apos;t see theirs. Unblock
          them from the ⋯ menu.
        </p>
      )}

      {profile.isSelf && showQr && (
        <section className="card qr-card">
          <QrCode value={profileUrl(window.location.origin, user.username)} size={220} />
          <p className="muted">Friends scan this in the musicshare app (or their camera) to open your profile.</p>
        </section>
      )}

      {profile.featured && (
        <section className="card featured">
          <h2>Featured song</h2>
          <TrackCard track={profile.featured.track} preferred={preferred} />
          {profile.featured.comment && <blockquote>{profile.featured.comment}</blockquote>}
        </section>
      )}

      {profile.nowPlaying ? (
        <NowPlayingCard np={profile.nowPlaying} preferred={preferred} showUser={false} />
      ) : (
        <p className="muted">Nothing playing right now.</p>
      )}

      <RecentPlays plays={profile.recent} preferred={preferred} attribution={profile.attribution} ownerId={user.id} />
    </div>
  );
}