import { Thermometer, BatteryLow, TriangleAlert, Snowflake, Flame, Fan, Droplet, Lock, Heater, PlaneTakeoff, PlaneLanding, BedDouble } from 'lucide-react'
import type { ZoneStatus } from '../types'
import { ROOM_STATE_LABELS, MHI_FAN_SPEEDS } from '../types'

const AC_DEVICE_TYPES = ['mhi_modbus', 'mhi_mqtt', 'midea', 'daikin', 'home_assistant']

// Departure = takeoff, arrival = landing, stayover = bed (lucide has no "person in
// bed" icon, so BedDouble is the closest stand-in). A departure also shows a second
// landing icon when has_next_booking — same-day-turnover hint (someone's due in later).
// A genuinely vacant room (no icon, since nothing's arriving today) instead gets a
// plain night-count-until-next-arrival, or "7+ nights" when nothing's booked at all
// within the scheduler's lookahead window.
function BookingIcons({ zone }: { zone: ZoneStatus }) {
  const textStyle = { display: 'inline-flex', alignItems: 'center', gap: 2, marginLeft: 6, fontSize: 11.5, fontWeight: 600, color: 'var(--text-mid)' } as const

  if (zone.booking_kind) {
    const iconProps = { size: 13, strokeWidth: 1.75 }
    return (
      <span style={textStyle}>
        {zone.booking_kind === 'departure' && <PlaneTakeoff {...iconProps} />}
        {zone.booking_kind === 'arrival' && <PlaneLanding {...iconProps} />}
        {zone.booking_kind === 'stayover' && <BedDouble {...iconProps} />}
        {zone.booking_kind === 'departure' && zone.has_next_booking && <PlaneLanding {...iconProps} />}
        {zone.total_nights != null && <span>{zone.current_night}/{zone.total_nights}</span>}
      </span>
    )
  }

  if (zone.room_state === 'vacant' && zone.zone_type === 'room') {
    return (
      <span style={textStyle}>
        Vacant {zone.vacant_nights != null ? `${zone.vacant_nights} night${zone.vacant_nights === 1 ? '' : 's'}` : '7+ nights'}
      </span>
    )
  }

  return null
}

const MODE_ICONS: Record<string, typeof Snowflake> = {
  cool: Snowflake,
  heat: Flame,
  fan: Fan,
  dry: Droplet,
  auto: Fan,
}

// bed -> living/lounge -> bathroom, matching the order in the sketch; anything else last.
function locationRank(location: string | null) {
  const l = (location || '').toLowerCase()
  if (l.includes('bed')) return 0
  if (l.includes('living') || l.includes('lounge')) return 1
  if (l.includes('bath')) return 2
  return 3
}

function fmtTemp(t: string | number | null | undefined) {
  return t != null ? `${Number(t).toFixed(1)}°C` : '—'
}

export default function ZoneCard({ zone, onClick }: { zone: ZoneStatus; onClick: () => void }) {
  const unhealthy = zone.devices.filter(d => d.health_state !== 'healthy').length
  const worstHealth = zone.devices.some(d => d.health_state === 'unresponsive' || d.health_state === 'poor')
  const lowBattery = zone.devices.some(d => d.battery_pct != null && d.battery_pct < 30)

  const trvs = zone.devices
    .filter(d => d.device_type === 'shelly_trv')
    .sort((a, b) => locationRank(a.location) - locationRank(b.location))
  const trvReadings = trvs.map(d => d.current_room_temp).filter((t): t is string => t != null).map(Number)
  const avgRoomTemp = trvReadings.length ? trvReadings.reduce((a, b) => a + b, 0) / trvReadings.length : null

  const ac = zone.devices.find(d => AC_DEVICE_TYPES.includes(d.device_type))
  const acOn = ac?.power_state === 'on'
  const ModeIcon = MODE_ICONS[ac?.current_mode || ''] || Fan
  const fanLevel = ac ? (MHI_FAN_SPEEDS as readonly string[]).indexOf(ac.fan_speed || '') + 1 : 0

  return (
    <div className={`card zone-card st-${zone.room_state}`} onClick={onClick} title={ROOM_STATE_LABELS[zone.room_state]}>
      <div className="zone-card-title">
        <span>
          {zone.name}
          <BookingIcons zone={zone} />
          {unhealthy > 0 && (
            <TriangleAlert
              size={14}
              strokeWidth={1.75}
              color={worstHealth ? 'var(--health-unresponsive)' : 'var(--health-degraded)'}
              style={{ verticalAlign: '-2px', marginLeft: 6 }}
            />
          )}
        </span>
        {!zone.auto_mode && <span className="badge badge-outline">Manual</span>}
      </div>

      <div className="zone-card-body">
        <div className="zone-card-main">
          <div className="zone-card-temp">
            <Thermometer size={16} strokeWidth={1.75} style={{ verticalAlign: '-2px', marginRight: 4 }} />
            {Number(zone.target_temp).toFixed(1)}°C / {fmtTemp(avgRoomTemp)}
          </div>

          {trvs.length > 0 && (
            <div className="rad-row">
              {trvs.slice(0, 3).map(d => (
                <div key={d.id} className={`rad-icon ${d.heating_active ? 'heating' : 'idle'}`}>
                  <Heater size={16} strokeWidth={1.75} />
                  <span>{fmtTemp(d.current_target_temp)}/{fmtTemp(d.current_room_temp)}</span>
                </div>
              ))}
            </div>
          )}
        </div>

        {ac && (
          <div className={`ac-block${acOn ? '' : ' off'}`}>
            {ac.remote_locked && <Lock size={12} strokeWidth={1.75} className="ac-lock" />}
            <div className="ac-mode-row">
              <ModeIcon size={20} strokeWidth={1.75} />
              <div className="fan-bar">
                {[1, 2, 3, 4].map(n => <span key={n} className={n <= fanLevel ? 'on' : ''} />)}
              </div>
            </div>
            <div className="ac-temp">{fmtTemp(ac.current_target_temp)} / {fmtTemp(ac.current_room_temp)}</div>
          </div>
        )}
      </div>

      <div className="zone-card-meta">
        <span>{zone.device_count ?? zone.devices.length} device{(zone.device_count ?? zone.devices.length) === 1 ? '' : 's'}</span>
        {lowBattery && <BatteryLow size={13} strokeWidth={1.75} color="var(--health-degraded)" />}
      </div>
    </div>
  )
}