import { useNMEA } from '../../hooks/useNMEA.js'
import { getApi } from '../../mock/index.js'
import Gauge from '../instruments/Gauge.jsx'
import Compass from '../instruments/Compass.jsx'
import WindRose from '../instruments/WindRose.jsx'

function DataRow({ label, value, unit, highlight }) {
  return (
    <div style={{ ...styles.row, background: highlight ? '#38bdf811' : 'transparent' }}>
      <span style={styles.label}>{label}</span>
      <span style={styles.value}>
        {value != null ? `${typeof value === 'number' ? value.toFixed(1) : value}` : '—'}
        {unit && <span style={styles.unit}> {unit}</span>}
      </span>
    </div>
  )
}

export default function InstrumentPanel() {
  const nmea = useNMEA()
  const isMock = import.meta.env.VITE_USE_MOCK === 'true'
  
  let waypointInfo = null
  let allWaypoints = []
  
  if (isMock) {
    const api = getApi()
    const snapshot = api.signalk.getSnapshot?.()
    waypointInfo = snapshot?.currentWaypoint
    allWaypoints = snapshot?.waypoints || []
  }

  return (
    <div style={styles.panel}>
      {/* Gauges row */}
      <div style={styles.gauges}>
        <Compass heading={nmea.heading} cog={nmea.cog} />
        <WindRose windAngle={nmea.windAngle} windSpeed={nmea.windSpeed} />
        <Gauge value={nmea.depth} min={0} max={30} label="Depth" unit="m" warning={3} danger={1.5} />
        <Gauge value={nmea.sog} min={0} max={12} label="SOG" unit="kn" />
      </div>

      {/* Waypoint info box (only in mock mode) */}
      {isMock && waypointInfo && (
        <div style={styles.waypointBox}>
          <div style={styles.waypointTitle}>📍 Route & Waypoints</div>
          <div style={styles.waypointInfo}>
            <div style={styles.waypointRow}>
              <span>Current:</span>
              <strong>{waypointInfo.name}</strong>
            </div>
            <div style={styles.waypointRow}>
              <span>Distance:</span>
              <strong>{nmea.distanceToWaypoint?.toFixed(2) || '—'} nm</strong>
            </div>
            <div style={styles.waypointRoute}>
              <span style={styles.routeLabel}>Route:</span>
              <div style={styles.waypoints}>
                {allWaypoints.map((wp, i) => (
                  <div
                    key={i}
                    style={{
                      ...styles.waypointTag,
                      background: i === (waypointInfo ? allWaypoints.indexOf(waypointInfo) : 0) ? 'var(--accent)' : 'var(--border)',
                      color: i === (waypointInfo ? allWaypoints.indexOf(waypointInfo) : 0) ? 'var(--bg)' : 'var(--text)',
                    }}
                  >
                    {i + 1}
                  </div>
                ))}
              </div>
            </div>
          </div>
        </div>
      )}

      {/* Data table */}
      <div style={styles.table}>
        <DataRow label="COG"          value={nmea.cog != null ? Math.round(nmea.cog) : null} unit="°" />
        <DataRow label="Heading"      value={nmea.heading != null ? Math.round(nmea.heading) : null} unit="°" />
        <DataRow label="SOG"          value={nmea.sog} unit="kn" />
        <DataRow label="Depth"        value={nmea.depth} unit="m" />
        <DataRow label="Wind Speed"   value={nmea.windSpeed} unit="kn" />
        <DataRow label="Wind Angle"   value={nmea.windAngle} unit="°" />
        <DataRow label="Water Temp"   value={nmea.waterTemp} unit="°C" />
        <DataRow label="Air Temp"     value={nmea.airTemp} unit="°C" />
        <DataRow label="RPM"          value={nmea.rpm} unit="" />
        <DataRow label="Rudder"       value={nmea.rudder} unit="°" />
        <DataRow label="Fuel"         value={nmea.fuel} unit="%" />
        <DataRow label="Lat"          value={nmea.lat?.toFixed(5)} unit="°N" />
        <DataRow label="Lon"          value={nmea.lon?.toFixed(5)} unit="°E" />
        {isMock && <DataRow label="Distance to WP" value={nmea.distanceToWaypoint} unit="nm" highlight />}
      </div>
    </div>
  )
}

const styles = {
  panel: { display: 'flex', flexDirection: 'column', gap: 16 },
  gauges: { display: 'flex', gap: 8, flexWrap: 'wrap', justifyContent: 'center' },
  
  waypointBox: {
    background: 'var(--surface)', borderRadius: 'var(--radius)',
    border: '1px solid var(--accent)',
    padding: 12,
  },
  waypointTitle: {
    fontSize: 12, fontWeight: 700, color: 'var(--accent)',
    marginBottom: 8, letterSpacing: '0.05em',
  },
  waypointInfo: { display: 'flex', flexDirection: 'column', gap: 6 },
  waypointRow: {
    display: 'flex', justifyContent: 'space-between', alignItems: 'center',
    fontSize: 12, color: 'var(--text)',
  },
  waypointRoute: {
    display: 'flex', flexDirection: 'column', gap: 6,
    marginTop: 4, paddingTop: 8,
    borderTop: '1px solid var(--border)',
  },
  routeLabel: { fontSize: 11, color: 'var(--muted)' },
  waypoints: {
    display: 'flex', gap: 6, flexWrap: 'wrap',
  },
  waypointTag: {
    width: 28, height: 28,
    display: 'flex', alignItems: 'center', justifyContent: 'center',
    borderRadius: 4, fontSize: 11, fontWeight: 600,
    transition: 'all 0.2s',
  },

  table: {
    display: 'grid', gridTemplateColumns: '1fr 1fr',
    gap: '0 24px', background: 'var(--surface)',
    borderRadius: 'var(--radius)', padding: 16,
    border: '1px solid var(--border)',
  },
  row: {
    display: 'flex', justifyContent: 'space-between', alignItems: 'center',
    padding: '7px 0', borderBottom: '1px solid var(--border)',
    transition: 'background 0.2s',
  },
  label: { fontSize: 12, color: 'var(--muted)' },
  value: { fontFamily: 'var(--font-mono)', fontSize: 13, color: 'var(--text)' },
  unit: { color: 'var(--muted)', fontSize: 11 },
}