const ZONE_CONFIG = [
  { key: 'z1', label: 'Z1 Recovery', color: '#60a5fa' },
  { key: 'z2', label: 'Z2 Base', color: '#34d399' },
  { key: 'z3', label: 'Z3 Tempo', color: '#fbbf24' },
  { key: 'z4', label: 'Z4 Threshold', color: '#f97316' },
  { key: 'z5', label: 'Z5 Max', color: '#f43f5e' },
]

export default function HRZoneBar({ zones }) {
  return (
    <div className="space-y-2">
      {/* Stacked bar */}
      <div className="flex h-4 rounded-full overflow-hidden gap-0.5">
        {ZONE_CONFIG.map(({ key, color }) => {
          const pct = zones[key] || 0
          if (pct < 0.5) return null
          return (
            <div
              key={key}
              style={{ width: `${pct}%`, backgroundColor: color }}
              className="h-full"
              title={`${key.toUpperCase()}: ${pct}%`}
            />
          )
        })}
      </div>

      {/* Legend */}
      <div className="flex flex-wrap gap-4">
        {ZONE_CONFIG.map(({ key, label, color }) => {
          const pct = zones[key] || 0
          return (
            <div key={key} className="flex items-center gap-1.5">
              <div className="w-2.5 h-2.5 rounded-sm" style={{ backgroundColor: color }} />
              <span className="text-xs text-gray-400">{label}</span>
              <span className="text-xs font-medium text-white">{pct}%</span>
            </div>
          )
        })}
      </div>
    </div>
  )
}