import { useMemo } from 'react'
import PublicLayout from '../../components/PublicLayout.jsx'
import PageHeader from '../../components/PageHeader.jsx'
import { Loading, ErrorState } from '../../components/PageState.jsx'
import { useAsync } from '../../lib/useAsync.js'
import { useShardFeed } from '../../lib/useShardFeed.js'
import { api } from '../../api/client.js'

// PUBLIC houses board: only houses in danger (IDOC), shown by location. Owner,
// price, decay detail and the full registry are staff-only (admin Houses view).
// Loaded from /public/shard/houses (IDOC-only), kept live by house.decay: a
// house entering IDOC appears, one leaving it drops off.
const HOUSE_KINDS = new Set(['house.decay'])

function HouseRow({ h }) {
  return (
    <div className="panel" style={{ padding: '14px 16px', display: 'flex', alignItems: 'center', gap: 14 }}>
      <span
        aria-hidden="true"
        style={{ flex: 'none', width: 8, height: 8, borderRadius: '50%', background: '#e05a5a', boxShadow: '0 0 8px rgba(224,90,90,0.7)' }}
      />
      <div style={{ minWidth: 0, flex: 1 }}>
        <div className="display" style={{ fontSize: '1rem', color: 'var(--head)', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
          {h.region || 'The wilderness'}
        </div>
        <div className="sans dim" style={{ fontSize: '0.76rem', marginTop: 2 }}>
          {h.map || '—'}{h.x != null ? ` · ${h.x}, ${h.y}` : ''}
        </div>
      </div>
      <span className="sans" style={{ flex: 'none', fontSize: '0.68rem', letterSpacing: '0.06em', color: '#e05a5a', border: '1px solid #e05a5a66', borderRadius: 999, padding: '2px 9px' }}>
        IDOC
      </span>
    </div>
  )
}

export default function Houses() {
  const { loading, error, data } = useAsync(() => api.shard.houses())
  const { events, connected } = useShardFeed({ filter: HOUSE_KINDS, max: 60 })

  // Merge the IDOC snapshot with live house.decay deltas by serial: entering IDOC
  // adds/updates the row; anything else (refreshed, collapsed) drops it.
  const board = useMemo(() => {
    const map = new Map()
    for (const h of data || []) if (h && h.serial) map.set(h.serial, h)
    for (let i = events.length - 1; i >= 0; i -= 1) {
      const ev = events[i]
      if (ev.kind !== 'house.decay' || !ev.serial) continue
      if (String(ev.to).toUpperCase() === 'IDOC') {
        map.set(ev.serial, { serial: ev.serial, name: ev.name, region: ev.region, map: ev.map, x: ev.x, y: ev.y, z: ev.z, isIdoc: true })
      } else {
        map.delete(ev.serial)
      }
    }
    return [...map.values()].sort((a, b) => (a.region || '').localeCompare(b.region || ''))
  }, [data, events])

  return (
    <PublicLayout section="website">
      <div className="shell-narrow page-body">
        <div style={{ display: 'flex', alignItems: 'flex-start', justifyContent: 'space-between', gap: 16 }}>
          <PageHeader eyebrow="Live" title="Houses in danger" lead="Homes that have fallen into IDOC — where to find them before they collapse." />
          <span className="sans" style={{ display: 'inline-flex', alignItems: 'center', gap: 6, fontSize: '0.74rem', color: connected ? '#7fd0a4' : 'var(--muted)', flex: 'none', marginTop: 6 }}>
            <span style={{ width: 8, height: 8, borderRadius: '50%', background: connected ? '#7fd0a4' : 'var(--dim)' }} />
            {connected ? 'Live' : 'Offline'}
          </span>
        </div>

        {loading && <Loading />}
        {error && <ErrorState message="Could not load the houses board right now." />}

        {!loading && !error && (
          board.length === 0 ? (
            <section className="panel" style={{ padding: 24, textAlign: 'center' }}>
              <p className="sans dim" style={{ margin: 0 }}>No houses are collapsing right now.</p>
            </section>
          ) : (
            <>
              <p className="sans" style={{ color: '#e0928a', fontSize: '0.8rem', marginTop: -12, marginBottom: 20 }}>
                {board.length} in danger
              </p>
              <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
                {board.map((h) => <HouseRow key={h.serial} h={h} />)}
              </div>
            </>
          )
        )}
      </div>
    </PublicLayout>
  )
}