import { useEffect, useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { TrendingUp, TrendingDown } from 'lucide-react';
import { api, DashboardData, Match } from '../api/client';
import TipModal from '../components/TipModal';
import styles from './DashboardPage.module.css';

interface Props {
  devUser?: number;
}

function formatStreak(streak: number): string {
  if (streak >= 20) return `⚡${streak}`;
  if (streak >= 10) return `🔥🔥${streak}`;
  if (streak >= 3) return `🔥${streak}`;
  if (streak > 0) return String(streak);
  return '0';
}

function formatKickoff(utcDate: string): string {
  return new Date(utcDate).toLocaleString('de-DE', {
    hour: '2-digit', minute: '2-digit', timeZone: 'Europe/Berlin',
  });
}

function formatCountdown(minutes: number): string {
  if (minutes < 60) return `in ${Math.round(minutes)} Min`;
  if (minutes < 60 * 24) return `in ${Math.floor(minutes / 60)}h`;
  const days = Math.floor(minutes / (60 * 24));
  return `in ${days} ${days === 1 ? 'Tag' : 'Tagen'}`;
}

export default function DashboardPage(_props: Props) {
  const [data, setData] = useState<DashboardData | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(false);
  const [tipMatch, setTipMatch] = useState<Match | null>(null);
  const navigate = useNavigate();

  useEffect(() => {
    setLoading(true);
    setError(false);
    api.getDashboard()
      .then(d => { setData(d); setLoading(false); })
      .catch(() => { setError(true); setLoading(false); });
  }, []);

  // Keep stored streak up to date (hook must be before early returns)
  const STREAK_KEY = 'tippspiel_last_streak';
  useEffect(() => {
    if (data && data.stats.streak > 0) {
      localStorage.setItem(STREAK_KEY, String(data.stats.streak));
    }
  }, [data]);

  if (loading) return <div className={styles.loading}>Laden...</div>;
  if (error || !data) return <div className={styles.error}>Dashboard konnte nicht geladen werden.</div>;

  const { hero, stats, nudges } = data;

  const lastRank = parseInt(localStorage.getItem('tippspiel_last_rank') || '0');
  const rankDiff = lastRank > 0 && stats.rank !== null ? lastRank - stats.rank : 0;

  // Streak break detection via localStorage
  const lastStreak = parseInt(localStorage.getItem(STREAK_KEY) || '0');
  const streakBroken = lastStreak >= 3 && stats.streak === 0;

  return (
    <div className={styles.dashboard}>
      {/* Hero Card */}
      <div className={styles.hero} onClick={() => navigate('/spiele')}>
        {/* Radial glow background effect */}
        <div className={styles.heroGlow} />

        <div className={styles.heroHeader}>
          <span className={styles.heroLabel}>Nächstes Spiel</span>
          {hero && (
            <span className={styles.heroCountdown}>
              <span className={styles.countdownDot} />
              {formatCountdown(hero.match.minutesUntilKickoff).toUpperCase()}
            </span>
          )}
        </div>

        {hero ? (
          <>
            {/* Teams with LED time in center */}
            <div className={styles.heroTeams}>
              <div className={styles.heroTeam}>
                <div className={styles.heroCrestBox}>
                  {hero.match.homeTeam.crest ? (
                    <img src={hero.match.homeTeam.crest} alt={hero.match.homeTeam.name} className={styles.heroCrest} />
                  ) : (
                    <span className={styles.heroCrestFallback}>🏳️</span>
                  )}
                </div>
                <span className={styles.heroTeamName}>{hero.match.homeTeam.shortName}</span>
              </div>

              {/* Center: LED time — each digit fixed-width for even spacing */}
              <div className={styles.heroCenter}>
                <span className={styles.heroLED}>
                  {formatKickoff(hero.match.utcDate).split('').map((ch, i) => (
                    <span key={i} className={ch === ':' ? styles.ledColon : styles.ledDigit}>{ch}</span>
                  ))}
                </span>
              </div>

              <div className={styles.heroTeam}>
                <div className={styles.heroCrestBox}>
                  {hero.match.awayTeam.crest ? (
                    <img src={hero.match.awayTeam.crest} alt={hero.match.awayTeam.name} className={styles.heroCrest} />
                  ) : (
                    <span className={styles.heroCrestFallback}>🏳️</span>
                  )}
                </div>
                <span className={styles.heroTeamName}>{hero.match.awayTeam.shortName}</span>
              </div>
            </div>

            {/* CTA or Tip Display */}
            {hero.userTip ? (
              <div className={styles.heroTip}>
                Dein Tipp: {hero.userTip.home}:{hero.userTip.away} ✓
              </div>
            ) : hero.tippable ? (
              <button
                className={styles.heroTipBtn}
                onClick={e => {
                  e.stopPropagation();
                  setTipMatch({
                    id: hero.match.id,
                    externalId: 0,
                    utcDate: hero.match.utcDate,
                    status: hero.match.status,
                    stage: '',
                    group: null,
                    homeTeam: hero.match.homeTeam,
                    awayTeam: hero.match.awayTeam,
                    score: { home: null, away: null },
                    userTip: null,
                    minutesUntilKickoff: hero.match.minutesUntilKickoff,
                    tippable: true,
                  });
                }}
              >
                Jetzt tippen ⚽
              </button>
            ) : null}
          </>
        ) : (
          <p className={styles.heroEmpty}>Keine anstehenden Spiele</p>
        )}
      </div>

      {/* Stats Row */}
      <div className={styles.statsRow}>
        <div className={`card ${styles.statTile}`}>
          <span className={styles.statValue}>
            {stats.rank !== null ? stats.rank : '—'}
            {rankDiff > 0 && <span className={styles.rankUp}><TrendingUp size={14} strokeWidth={2.5} /></span>}
            {rankDiff < 0 && <span className={styles.rankDown}><TrendingDown size={14} strokeWidth={2.5} /></span>}
          </span>
          <span className={styles.statLabel}>Dein Rang</span>
        </div>
        <div className={`card ${styles.statTile}`}>
          <span className={`${styles.statValue} ${styles.statGold}`}>{stats.totalPoints}</span>
          <span className={styles.statLabel}>Punkte</span>
        </div>
        <div className={`card ${styles.statTile}`}>
          <span className={styles.statValue}>{formatStreak(stats.streak)}</span>
          <span className={styles.statLabel}>Streak</span>
        </div>
      </div>

      {/* Nudges */}
      {(streakBroken || nudges.length > 0) && (
        <div className={styles.nudges}>
          {streakBroken && (
            <div
              className={`card ${styles.nudge} ${styles.nudgeStreak}`}
              onClick={() => {
                localStorage.removeItem(STREAK_KEY);
                navigate('/spiele');
              }}
            >
              <span className={styles.nudgeIcon}>💔</span>
              <span className={styles.nudgeText}>
                Deine {lastStreak}er-Serie ist gerissen! Starte eine neue.
              </span>
            </div>
          )}
          {nudges.map((nudge, i) => (
            <div
              key={i}
              className={`card ${styles.nudge}`}
              onClick={() => {
                if (nudge.type === 'untipped') navigate('/spiele');
                else if (nudge.type === 'leader') navigate('/rangliste');
              }}
            >
              <span className={styles.nudgeIcon}>
                {nudge.type === 'untipped' ? '📅' : nudge.type === 'leader' ? '🏆' : '🎯'}
              </span>
              <span className={styles.nudgeText}>{nudge.text}</span>
            </div>
          ))}
        </div>
      )}

      {tipMatch && (
        <TipModal
          match={tipMatch}
          onClose={() => setTipMatch(null)}
          onSaved={(_matchId, tipHome, tipAway) => {
            setTipMatch(null);
            if (data && data.hero) {
              setData({
                ...data,
                hero: { ...data.hero, userTip: { home: tipHome, away: tipAway } },
              });
            }
          }}
        />
      )}
    </div>
  );
}