// screens-home.jsx — Home feed: "Runs near you"
// Required globals: PACER, Chip, Avatar, Btn, StatRow, Icon, Card, RUNS, USERS, ME

const FILTERS = ['Women-only', '2K+', '5K+', '10K+'];

function RunCard({ run, onClick, compact = false }) {
  const host = USERS[run.host];
  const spotsLeft = run.capacity - run.joined.length;
  const isFull = spotsLeft <= 0;
  const womenOnly = run.womenOnly;

  return (
    <div onClick={onClick} style={{
      background: PACER.card,
      border: `1px solid ${PACER.border}`,
      borderRadius: 18,
      padding: 16,
      cursor: 'pointer',
      transition: 'border-color .15s, transform .12s',
      position: 'relative',
    }}
    onMouseEnter={e => e.currentTarget.style.borderColor = PACER.borderStrong}
    onMouseLeave={e => e.currentTarget.style.borderColor = PACER.border}>

      {/* Top: distance + pace big | time block */}
      <div style={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', marginBottom: 12 }}>
        <div style={{ display: 'flex', alignItems: 'baseline', gap: 12 }}>
          <div style={{
            fontFamily: PACER.mono, fontSize: 26, fontWeight: 500,
            color: PACER.text, lineHeight: 1, letterSpacing: -0.5,
          }}>{run.distance}</div>
          <div style={{
            fontFamily: PACER.mono, fontSize: 13, color: PACER.textDim,
            letterSpacing: 0,
          }}>{run.paceMin}–{run.paceMax}<span style={{ color: PACER.textSubtle }}>/km</span></div>
        </div>
        <div style={{ textAlign: 'right' }}>
          <div style={{ fontFamily: PACER.mono, fontSize: 13, color: PACER.text, fontWeight: 500 }}>
            {run.time}
          </div>
          <div style={{ fontFamily: PACER.font, fontSize: 11.5, color: PACER.textMute, marginTop: 2 }}>
            {run.when}
          </div>
        </div>
      </div>

      {/* Title */}
      <div style={{
        fontFamily: PACER.font, fontSize: 17, fontWeight: 600,
        color: PACER.text, letterSpacing: -0.3, marginBottom: 4,
      }}>{run.title}</div>

      {/* Location */}
      <div style={{ display: 'flex', alignItems: 'center', gap: 5, marginBottom: 14 }}>
        <Icon name="pin" size={13} color={PACER.textMute}/>
        <span style={{ fontFamily: PACER.font, fontSize: 13, color: PACER.textDim }}>
          {run.area}
        </span>
      </div>

      {/* Bottom: host + chips + spots */}
      <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 10 }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 8, minWidth: 0 }}>
          <Avatar name={host.name} size={26}/>
          <span style={{ fontFamily: PACER.font, fontSize: 12.5, color: PACER.textDim, whiteSpace: 'nowrap', overflow: 'hidden', textOverflow: 'ellipsis' }}>
            {host.name.split(' ')[0]}
          </span>
        </div>

        <div style={{ display: 'flex', alignItems: 'center', gap: 6, flexWrap: 'wrap', justifyContent: 'flex-end' }}>
          {womenOnly && <Chip tone="magenta" size="xs">Women-only</Chip>}
          <Chip tone={isFull ? 'amber' : 'default'} size="xs">
            <span style={{ fontFamily: PACER.mono }}>{run.joined.length}</span>
            <span style={{ opacity: 0.5 }}>/</span>
            <span style={{ fontFamily: PACER.mono }}>{run.capacity}</span>
          </Chip>
        </div>
      </div>
    </div>
  );
}

// Featured "right now" card — extra emphasis with neon edge
function FeaturedRunCard({ run, onClick }) {
  const host = USERS[run.host];
  return (
    <div onClick={onClick} style={{
      background: `linear-gradient(180deg, rgba(212,255,58,0.05) 0%, rgba(212,255,58,0) 60%), ${PACER.card}`,
      border: `1px solid ${PACER.limeBorder}`,
      borderRadius: 22, padding: 18,
      cursor: 'pointer', position: 'relative', overflow: 'hidden',
    }}>
      {/* live ribbon */}
      <div style={{
        display: 'flex', alignItems: 'center', gap: 6, marginBottom: 14,
      }}>
        <span style={{
          width: 6, height: 6, borderRadius: 99, background: PACER.lime,
          boxShadow: `0 0 0 4px ${PACER.limeSoft}`,
        }}/>
        <span style={{
          fontFamily: PACER.font, fontSize: 11, color: PACER.lime,
          letterSpacing: 1.2, textTransform: 'uppercase', fontWeight: 600,
        }}>Starting in 2h</span>
        <span style={{ flex: 1 }}/>
        <span style={{ fontFamily: PACER.mono, fontSize: 13, color: PACER.text, fontWeight: 500 }}>
          {run.time}
        </span>
      </div>

      <div style={{
        fontFamily: PACER.font, fontSize: 22, fontWeight: 600,
        color: PACER.text, letterSpacing: -0.5, marginBottom: 8, lineHeight: 1.15,
      }}>{run.title}</div>

      <div style={{ display: 'flex', alignItems: 'baseline', gap: 14, marginBottom: 16 }}>
        <span style={{ fontFamily: PACER.mono, fontSize: 16, color: PACER.text, fontWeight: 500 }}>
          {run.distance}
        </span>
        <span style={{ fontFamily: PACER.mono, fontSize: 13, color: PACER.textDim }}>
          {run.paceMin}–{run.paceMax}/km
        </span>
        <span style={{ fontFamily: PACER.font, fontSize: 13, color: PACER.textDim }}>
          {run.area}
        </span>
      </div>

      <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: -6 }}>
          {run.joined.slice(0, 3).map((u, i) => (
            <div key={u} style={{ marginLeft: i === 0 ? 0 : -8, border: `2px solid ${PACER.card}`, borderRadius: '50%' }}>
              <Avatar name={USERS[u].name} size={28}/>
            </div>
          ))}
          <span style={{ fontFamily: PACER.font, fontSize: 12.5, color: PACER.textDim, marginLeft: 10 }}>
            {host.name.split(' ')[0]} hosting · {run.capacity - run.joined.length} spots left
          </span>
        </div>
      </div>
    </div>
  );
}

function HomeScreen({ nav, onSelectRun, hasNewRequest }) {
  const [activeFilter, setFilter] = React.useState('Today');

  // Featured = first run with `when === 'Today'`
  const featured = RUNS.find(r => r.when === 'Today');
  const others = RUNS.filter(r => r !== featured);

  // Group by when
  const groups = {};
  others.forEach(r => { (groups[r.when] = groups[r.when] || []).push(r); });

  return (
    <div style={{ background: PACER.bg, minHeight: '100%', color: PACER.text, fontFamily: PACER.font }}>
      {/* Header */}
      <div style={{ padding: '54px 20px 8px' }}>
        <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: 22 }}>
          <div style={{ display: 'flex', alignItems: 'center', gap: 9 }}>
            <div style={{
              width: 30, height: 30, borderRadius: 9, background: PACER.lime,
              display: 'flex', alignItems: 'center', justifyContent: 'center',
            }}>
              <Icon name="run" size={18} color={PACER.limeInk}/>
            </div>
            <div style={{
              fontFamily: PACER.font, fontSize: 19, fontWeight: 700,
              letterSpacing: -0.5, color: PACER.text,
            }}>Run Crew</div>
          </div>
          <div style={{ display: 'flex', alignItems: 'center', gap: 8 }}>
            <button onClick={() => nav('hostRequests')} style={{
              width: 40, height: 40, borderRadius: 12,
              background: 'rgba(255,255,255,0.04)', border: `1px solid ${PACER.border}`,
              color: PACER.text, cursor: 'pointer', position: 'relative',
              display: 'flex', alignItems: 'center', justifyContent: 'center',
            }}>
              <Icon name="users" size={18} color={PACER.textDim}/>
              {hasNewRequest && (
                <span style={{
                  position: 'absolute', top: 8, right: 8, width: 8, height: 8,
                  borderRadius: '50%', background: PACER.lime,
                  boxShadow: `0 0 0 2px ${PACER.bg}`,
                }}/>
              )}
            </button>
            <Avatar name={ME.firstName} size={40} photo/>
          </div>
        </div>

        {/* Hero question */}
        <div style={{
          fontFamily: PACER.font, fontSize: 30, fontWeight: 600,
          letterSpacing: -1.1, color: PACER.text, lineHeight: 1.05,
          marginBottom: 4,
        }}>Runs near you</div>
        <div style={{
          fontFamily: PACER.font, fontSize: 14, color: PACER.textDim,
          letterSpacing: -0.1,
        }}>
          <span style={{ fontFamily: PACER.mono, color: PACER.text }}>{ME.paceMin}–{ME.paceMax}/km</span>
          <span style={{ margin: '0 6px', color: PACER.textSubtle }}>·</span>
          <span>{ME.neighborhood}</span>
        </div>
      </div>

      {/* Filter chips — horizontal scroll */}
      <div style={{
        display: 'flex', gap: 8, padding: '20px 20px 18px',
        overflowX: 'auto', scrollbarWidth: 'none',
      }}>
        <button onClick={() => setFilter(null)} style={{
          height: 34, padding: '0 14px', borderRadius: 99,
          background: !activeFilter ? PACER.lime : 'transparent',
          border: `1px solid ${!activeFilter ? PACER.lime : PACER.border}`,
          color: !activeFilter ? PACER.limeInk : PACER.textDim,
          fontFamily: PACER.font, fontSize: 13, fontWeight: !activeFilter ? 600 : 500,
          cursor: 'pointer', flexShrink: 0, transition: 'all .15s',
        }}>All</button>
        {FILTERS.map(f => (
          <button key={f} onClick={() => setFilter(f === activeFilter ? null : f)} style={{
            height: 34, padding: '0 14px', borderRadius: 99,
            background: f === activeFilter ? PACER.lime : 'transparent',
            border: `1px solid ${f === activeFilter ? PACER.lime : PACER.border}`,
            color: f === activeFilter ? PACER.limeInk : PACER.textDim,
            fontFamily: PACER.font, fontSize: 13, fontWeight: f === activeFilter ? 600 : 500,
            cursor: 'pointer', flexShrink: 0, transition: 'all .15s',
          }}>{f}</button>
        ))}
      </div>

      {/* Featured today */}
      <div style={{ padding: '0 20px 24px' }}>
        {featured && <FeaturedRunCard run={featured} onClick={() => onSelectRun(featured.id)}/>}
      </div>

      {/* Grouped sections */}
      <div style={{ padding: '0 20px 120px' }}>
        {Object.entries(groups).map(([when, runs]) => (
          <div key={when} style={{ marginBottom: 22 }}>
            <div style={{
              display: 'flex', alignItems: 'baseline', justifyContent: 'space-between',
              marginBottom: 10,
            }}>
              <div style={{
                fontFamily: PACER.font, fontSize: 12, fontWeight: 600,
                color: PACER.textMute, textTransform: 'uppercase', letterSpacing: 1.4,
              }}>{when}</div>
              <span style={{ fontFamily: PACER.mono, fontSize: 11, color: PACER.textSubtle }}>
                {runs.length}
              </span>
            </div>
            <div style={{ display: 'grid', gap: 10 }}>
              {runs.map(r => (
                <RunCard key={r.id} run={r} onClick={() => onSelectRun(r.id)}/>
              ))}
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}

Object.assign(window, { HomeScreen, RunCard, FeaturedRunCard });