// Modulo Sport: tre viste (dashboard, elenco sessioni con filtri, schede atleta) in un'unica
// isola, perché condividono lo stesso insieme di sessioni e i filtri agiscono su quello.
import { useMemo, useState } from 'react';
import DataChart from './charts/DataChart';
import type { Athlete, Session } from '../../lib/stress-index/data';
import { dataBreve, dataOra, durata, kpiSport, perSettimana, riepilogoAtleti } from '../../lib/stress-index/sport';

interface Props {
  sessions: Session[];
  athletes: Athlete[];
  /** Ultimo giorno coperto dai dati: tutte le finestre temporali partono da qui. */
  riferimento: string;
}

const TABS = [
  { key: 'dashboard', label: 'Dashboard' },
  { key: 'sessioni', label: 'Sessioni' },
  { key: 'atleti', label: 'Atleti' },
];

const PERIODI = [
  { key: 'tutto', label: 'Tutto', giorni: 0 },
  { key: '7', label: 'Ultimi 7 giorni', giorni: 7 },
  { key: '30', label: 'Ultimi 30 giorni', giorni: 30 },
  { key: '90', label: 'Ultimi 90 giorni', giorni: 90 },
];

export default function SportView({ sessions, athletes, riferimento }: Props) {
  const [tab, setTab] = useState('dashboard');
  const [atleta, setAtleta] = useState('tutti');
  const [periodo, setPeriodo] = useState('tutto');
  const [sport, setSport] = useState('tutti');

  const sports = useMemo(
    () => [...new Set(sessions.map((s) => s.sport).filter((s): s is string => Boolean(s)))],
    [sessions]
  );

  const filtrate = useMemo(() => {
    const giorni = PERIODI.find((p) => p.key === periodo)?.giorni ?? 0;
    const limite = new Date(`${riferimento}T00:00:00`);
    limite.setDate(limite.getDate() - giorni + 1);
    const dal = limite.toISOString().slice(0, 10);
    return sessions.filter((s) =>
      (atleta === 'tutti' || s.athleteId === atleta) &&
      (sport === 'tutti' || s.sport === sport) &&
      (!giorni || s.startedAt.slice(0, 10) >= dal)
    );
  }, [sessions, atleta, periodo, sport, riferimento]);

  const kpi = useMemo(() => kpiSport(sessions, riferimento), [sessions, riferimento]);
  const settimane = useMemo(() => perSettimana(sessions, 12, riferimento), [sessions, riferimento]);
  const atletiRiepilogo = useMemo(() => riepilogoAtleti(sessions, athletes, riferimento), [sessions, athletes, riferimento]);
  const nome = (id: string) => athletes.find((a) => a.clientId === id)?.name ?? id;

  return (
    <div className="si-stack">
      <div className="si-head">
        <h1>Modulo Sport <span className="si-badge si-badge--pro">Pro</span></h1>
        <p>Sessioni di allenamento, zone DFA Alpha1, carico e recupero degli atleti</p>
      </div>

      <div className="si-tabs" role="tablist">
        {TABS.map((t) => (
          <button key={t.key} type="button" role="tab" className="si-tabs__btn" aria-selected={t.key === tab} onClick={() => setTab(t.key)}>
            {t.label}
          </button>
        ))}
      </div>

      {tab === 'dashboard' && (
        <div className="si-stack">
          <div className="si-grid si-grid--kpi">
            {kpi.map((k) => (
              <div className="si-card" key={k.label}>
                <p className="si-kpi__label">{k.label}</p>
                <p className="si-kpi__value">{k.value}</p>
                {k.note && <p className="si-muted si-small">{k.note}</p>}
              </div>
            ))}
          </div>

          <section className="si-card">
            <div className="si-card__head">
              <div>
                <h2 className="si-card__title">Sessioni per settimana</h2>
                <p className="si-muted si-small">Ultime 12 settimane</p>
              </div>
            </div>
            <DataChart type="bar" data={settimane} xKey="settimana" series={[{ key: 'sessioni', label: 'Sessioni', color: '#9c8b70' }]} />
          </section>

          <section className="si-card">
            <div className="si-card__head"><h2 className="si-card__title">Ultime sessioni</h2></div>
            <div className="si-scroll-x">
              <table className="si-table">
                <thead>
                  <tr><th>Atleta</th><th>Data</th><th>Sport</th><th>Durata</th><th>TRIMP</th><th>HR medio</th><th>DFA A1</th></tr>
                </thead>
                <tbody>
                  {sessions.slice(0, 10).map((s) => (
                    <tr key={s.id}>
                      <td><a href={`/piattaforme/stress-index/clienti/${s.athleteId}`}>{nome(s.athleteId)}</a></td>
                      <td className="si-muted">{dataBreve(s.startedAt)}</td>
                      <td>{s.sport ?? '—'}</td>
                      <td className="si-table__num">{durata(s.durationSec)}</td>
                      <td className="si-table__num">{s.trimp}</td>
                      <td className="si-table__num">{s.hrAvg} bpm</td>
                      <td className="si-table__num">{s.dfaA1 ?? '—'}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </section>
        </div>
      )}

      {tab === 'sessioni' && (
        <div className="si-stack">
          <section className="si-card">
            <div className="si-filters">
              <label className="si-field">Atleta
                <select value={atleta} onChange={(e) => setAtleta(e.target.value)}>
                  <option value="tutti">Tutti</option>
                  {athletes.map((a) => <option key={a.clientId} value={a.clientId}>{a.name}</option>)}
                </select>
              </label>
              <label className="si-field">Periodo
                <select value={periodo} onChange={(e) => setPeriodo(e.target.value)}>
                  {PERIODI.map((p) => <option key={p.key} value={p.key}>{p.label}</option>)}
                </select>
              </label>
              <label className="si-field">Sport
                <select value={sport} onChange={(e) => setSport(e.target.value)}>
                  <option value="tutti">Tutti</option>
                  {sports.map((s) => <option key={s} value={s}>{s}</option>)}
                </select>
              </label>
              <p className="si-muted si-small si-filters__count">
                {filtrate.length} {filtrate.length === 1 ? 'sessione' : 'sessioni'}
              </p>
            </div>
          </section>

          <section className="si-card">
            <div className="si-scroll-x">
              <table className="si-table">
                <thead>
                  <tr><th>Data e ora</th><th>Atleta</th><th>Sport</th><th>Durata</th><th>HR medio</th><th>HR max</th><th>TRIMP</th><th>DFA A1</th><th>RPE</th></tr>
                </thead>
                <tbody>
                  {filtrate.map((s) => (
                    <tr key={s.id}>
                      <td className="si-muted">{dataOra(s.startedAt)}</td>
                      <td><a href={`/piattaforme/stress-index/clienti/${s.athleteId}`}>{nome(s.athleteId)}</a></td>
                      <td>{s.sport ?? '—'}</td>
                      <td className="si-table__num">{durata(s.durationSec)}</td>
                      <td className="si-table__num">{s.hrAvg}</td>
                      <td className="si-table__num">{s.hrMax}</td>
                      <td className="si-table__num">{s.trimp}</td>
                      <td className="si-table__num">{s.dfaA1 ?? '—'}</td>
                      <td className="si-table__num">{s.rpe ? `${s.rpe}/10` : '—'}</td>
                    </tr>
                  ))}
                </tbody>
              </table>
              {filtrate.length === 0 && <p className="si-muted si-small si-empty">Nessuna sessione con questi filtri.</p>}
            </div>
          </section>
        </div>
      )}

      {tab === 'atleti' && (
        <div className="si-grid si-grid--halves">
          {atletiRiepilogo.map((a) => (
            <section className="si-card si-athlete" key={a.clientId}>
              <div className="si-card__head">
                <div>
                  <h2 className="si-athlete__name">{a.name}</h2>
                  <p className="si-muted si-small">{a.sport ?? 'Sport non specificato'}</p>
                </div>
                <span className={`si-badge si-badge--${a.trend === 'in calo' ? 'bad' : a.trend === 'in crescita' ? 'ok' : 'warn'}`}>
                  {a.trend}
                </span>
              </div>

              <div className="si-athlete__stats">
                <div><p className="si-athlete__num">{a.sessioni30}</p><p className="si-muted si-small">Sessioni 30gg</p></div>
                <div><p className="si-athlete__num">{a.trimp7}</p><p className="si-muted si-small">TRIMP 7gg</p></div>
                <div><p className="si-athlete__num">{a.ultimoTrimp}</p><p className="si-muted si-small">Ultimo TRIMP</p></div>
              </div>

              <a className="si-athlete__foot" href={`/piattaforme/stress-index/clienti/${a.clientId}`}>
                <span>{a.ultimaSessione ? `Ultima sessione ${dataBreve(a.ultimaSessione)}` : 'Nessuna sessione registrata'}</span>
                <span aria-hidden="true">→</span>
              </a>
            </section>
          ))}
        </div>
      )}
    </div>
  );
}