'use client';

import { useEffect, useMemo, useState } from 'react';
import SportBadge from '@/components/vyndr/SportBadge';
import GradeBadge from '@/components/vyndr/GradeBadge';
import { playerHref } from '@/lib/playerHref';
import { dedupeLeaders } from '@/lib/playerGrouping';
import { statAbbrev } from '@/lib/statAbbrev';

/**
 * ExploreHub (Session 42 leaders; Session 60 night2/C — THE AGGREGATOR).
 * The "entire picture" page: leaders + full streaks + hot lists, one sport
 * selector, everything free and interpreted through the lens. The page shell
 * (app/explore/page.tsx) is a server component carrying the SEO metadata.
 */
import StreaksPanel from '@/components/StreaksPanel';
import HotListPanel from '@/components/HotListPanel';
import NewsWire from '@/components/vyndr/NewsWire';
import FuturesBoard from '@/components/vyndr/FuturesBoard';
import { useAuth } from '@/contexts/AuthContext';
import { nextRunLabelET } from '@/lib/pipelineSchedule';
import { OFF_SEASON } from '@/lib/emptyState';

interface Leader {
  player: string;
  team: string;
  stat: string;
  line: number | string;
  side: string;
  grade: string;
  confidence: number;
}

const SPORTS = [
  { key: 'nba', label: 'NBA' },
  { key: 'mlb', label: 'MLB' },
  { key: 'wnba', label: 'WNBA' },
];

export default function ExploreHub() {
  const { tier } = useAuth();
  const [sport, setSport] = useState('mlb');
  const [leaders, setLeaders] = useState<Leader[]>([]);
  const [state, setState] = useState<'loading' | 'ready' | 'error'>('loading');
  const [query, setQuery] = useState('');

  useEffect(() => {
    let active = true;
    setState('loading');
    fetch(`/api/stats/leaders?sport=${sport}&limit=25`)
      .then((r) => r.json())
      .then((d) => { if (active) { setLeaders(Array.isArray(d.leaders) ? d.leaders : []); setState('ready'); } })
      .catch(() => { if (active) setState('error'); });
    return () => { active = false; };
  }, [sport]);

  const rows = useMemo(() => {
    const q = query.trim().toLowerCase();
    const filtered = q ? leaders.filter((l) => (l.player || '').toLowerCase().includes(q)) : leaders;
    // P0-3 — ONE row per player+market family + a per-market cap, so a player's
    // alt-line ladder (Bohm ×3) collapses to one entry and no single prop type
    // (9× stolen_bases) can flood the ranked board.
    return dedupeLeaders(filtered, 4) as Leader[];
  }, [leaders, query]);

  // Wave 2B — never-dark hub. When the selected sport is in its OFF-SEASON, the
  // hub LEADS with futures + the wire (real, always-available data) instead of
  // a dark leaderboard; in-season those sections COMPLEMENT the live board
  // below. Each self-hides independently on an empty feed — no empty boxes.
  const off = OFF_SEASON[sport as keyof typeof OFF_SEASON];
  const isOffseason = !!(off && off.months.includes(new Date().getMonth()));

  // Both sections self-hide (return null) when their feeds are empty.
  const hubSections = (
    <>
      <FuturesBoard sport={sport} />
      <NewsWire sport={sport} />
    </>
  );

  return (
    <section style={{ maxWidth: 920, margin: '0 auto', padding: '24px 16px 120px' }}>
      <div style={{ display: 'flex', alignItems: 'flex-end', justifyContent: 'space-between', gap: 14, marginBottom: 22, flexWrap: 'wrap' }}>
        <div>
          <div className="mono" style={{ fontSize: 11, color: 'var(--g-a)', letterSpacing: '0.12em', marginBottom: 8 }}>STATS · /EXPLORE</div>
          <h1 style={{ margin: '0 0 8px', fontSize: 30, fontWeight: 800, letterSpacing: '-0.01em' }}>Stats Explorer</h1>
          <p style={{ margin: 0, maxWidth: 560, fontSize: 14, lineHeight: 1.6, color: 'var(--text-1)' }}>
            Tonight&apos;s league leaderboard — every graded prop, ranked by VYNDR confidence, with the grade and archetype context only VYNDR has.
          </p>
        </div>
        <div style={{ display: 'flex', gap: 4, background: 'var(--bg-1)', border: '1px solid var(--border)', borderRadius: 8, padding: 4 }}>
          {SPORTS.map((s) => (
            <button
              key={s.key}
              onClick={() => setSport(s.key)}
              className="mono"
              style={{ cursor: 'pointer', border: 'none', borderRadius: 5, padding: '7px 14px', fontSize: 11, fontWeight: 600, letterSpacing: '0.04em', color: sport === s.key ? '#06060B' : 'var(--text-1)', background: sport === s.key ? 'var(--g-a)' : 'transparent' }}
            >
              {s.label}
            </button>
          ))}
        </div>
      </div>

      {/* OFF-SEASON LEAD — futures + wire come FIRST when the board is dark. */}
      {isOffseason && hubSections}

      {/* FILTER BAR */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 11, flexWrap: 'wrap', marginBottom: 14, background: 'var(--bg-1)', border: '1px solid var(--border)', borderRadius: 11, padding: '11px 14px' }}>
        <span className="mono" style={{ fontSize: 14, color: 'var(--text-2)' }}>⌕</span>
        <input
          value={query}
          onChange={(e) => setQuery(e.target.value)}
          placeholder="Search players"
          style={{ appearance: 'none', background: 'transparent', border: 'none', outline: 'none', fontFamily: 'var(--sans)', fontSize: 13, color: '#fff', flex: 1, minWidth: 140 }}
        />
        <span className="mono" style={{ fontSize: 10, color: 'var(--text-2)' }}>{rows.length} graded</span>
      </div>

      {/* LEADERBOARD */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 9, marginBottom: 13 }}>
        <span style={{ width: 6, height: 6, background: 'var(--g-a)', borderRadius: 1 }} />
        <span className="mono" style={{ fontSize: 11, fontWeight: 600, letterSpacing: '0.1em', color: 'var(--text-1)' }}>LEAGUE LEADERBOARD</span>
        <SportBadge sport={sport} />
      </div>

      <div style={{ background: 'var(--bg-1)', border: '1px solid var(--border)', borderRadius: 12, overflow: 'hidden' }}>
        <div className="mono game-lines-grid" style={{ display: 'grid', gridTemplateColumns: '34px 1fr 90px 70px 44px', gap: 0, alignItems: 'center', padding: '10px 16px', borderBottom: '1px solid #14141E', fontSize: 9, color: 'var(--text-2)', letterSpacing: '0.08em' }}>
          <div>#</div><div>PLAYER</div><div style={{ textAlign: 'right' }}>PROP</div><div style={{ textAlign: 'right' }}>CONF</div><div style={{ textAlign: 'center' }}>GRD</div>
        </div>

        {state === 'loading' && <div className="mono" style={{ padding: '30px 16px', textAlign: 'center', fontSize: 12, color: 'var(--text-2)' }}>Loading tonight&apos;s slate…</div>}
        {state === 'error' && <div className="mono" style={{ padding: '30px 16px', textAlign: 'center', fontSize: 12, color: 'var(--miss)' }}>Could not load the leaderboard. Try again.</div>}
        {state === 'ready' && rows.length === 0 && (
          <div className="mono" style={{ padding: '30px 16px', textAlign: 'center', fontSize: 12, color: 'var(--text-2)' }}>
            No graded props for {sport.toUpperCase()} yet. Grades post {nextRunLabelET() || 'on the next pipeline run'}.
          </div>
        )}
        {state === 'ready' && rows.map((r, i) => (
          <a
            key={i}
            href={playerHref(r.player, sport)}
            className="game-lines-grid"
            style={{ textDecoration: 'none', color: 'inherit', display: 'grid', gridTemplateColumns: '34px 1fr 90px 70px 44px', gap: 0, alignItems: 'center', padding: '13px 16px', borderBottom: '1px solid #14141E' }}
          >
            <div className="mono" style={{ fontSize: 14, fontWeight: 700, color: i < 3 ? 'var(--g-a)' : 'var(--text-1)' }}>{i + 1}</div>
            <div style={{ minWidth: 0, display: 'flex', alignItems: 'center', gap: 8, flexWrap: 'wrap' }}>
              <span style={{ fontWeight: 700, fontSize: 13, color: '#fff', whiteSpace: 'nowrap' }}>{r.player}</span>
              {r.team && <span className="mono" style={{ fontSize: 10, color: 'var(--text-1)' }}>{r.team}</span>}
            </div>
            <div className="mono" style={{ textAlign: 'right', fontSize: 12, color: '#C8CCD6' }}>{statAbbrev(r.stat)} {r.side}{r.line}</div>
            <div className="mono" style={{ textAlign: 'right', fontSize: 13, fontWeight: 600, color: 'var(--text-0)' }}>{r.confidence != null ? `${r.confidence}%` : '—'}</div>
            <div style={{ display: 'flex', justifyContent: 'center' }}><GradeBadge grade={r.grade} size="sm" /></div>
          </a>
        ))}
      </div>

      {/* Session 60 (night2/C) — THE AGGREGATOR. Full streaks + hot lists
          for the selected sport, every row through the lens. The picture is
          free; the grade is the paid layer. Panels self-hide when cold. */}
      <div style={{ marginTop: 28 }}>
        <StreaksPanel sport={sport} tier={tier} stat="all" />
        <HotListPanel sport={sport} tier={tier} stat="all" />
      </div>

      {/* IN-SEASON — futures + wire COMPLEMENT the live board below it. */}
      {!isOffseason && hubSections}
    </section>
  );
}