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import { useState } from 'react';
import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, Legend } from 'recharts';
import { Metrics } from '../types';

interface MetricsChartProps {
  data: Metrics | null;
  metric: 'cpu' | 'memory';
  loading?: boolean;
}

export function MetricsChart({ data, metric, loading }: MetricsChartProps) {
  const [visible, setVisible] = useState({ avg: true, max: true, min: true });

  const chartData = data?.timestamps.map((ts, i) => ({
    time: new Date(ts).toLocaleTimeString(),
    avg: data[metric].avg[i] ?? 0,
    max: data[metric].max[i] ?? 0,
    min: data[metric].min[i] ?? 0,
  })) || [];

  const colors = {
    avg: '#60a5fa',
    max: '#f87171',
    min: '#4ade80',
  };

  const label = metric === 'cpu' ? 'CPU %' : 'Memory %';

  if (loading) {
    return (
      <div className="bg-gray-800 rounded-lg p-4 animate-pulse">
        <div className="h-64 bg-gray-700 rounded"></div>
      </div>
    );
  }

  return (
    <div className="bg-gray-800 rounded-lg p-4 border border-gray-700">
      <div className="flex items-center justify-between mb-4">
        <h3 className="text-lg font-semibold text-white">{label}</h3>
        <div className="flex gap-2">
          {(['avg', 'max', 'min'] as const).map((key) => (
            <button
              key={key}
              onClick={() => setVisible(v => ({ ...v, [key]: !v[key] }))}
              className={`px-2 py-1 rounded text-xs transition ${
                visible[key] ? 'bg-gray-600 text-white' : 'bg-gray-700 text-gray-400'
              }`}
            >
              {key.toUpperCase()}
            </button>
          ))}
        </div>
      </div>
      <div className="h-64">
        <ResponsiveContainer width="100%" height="100%">
          <LineChart data={chartData}>
            <CartesianGrid strokeDasharray="3 3" stroke="#374151" />
            <XAxis dataKey="time" stroke="#9ca3af" fontSize={10} />
            <YAxis stroke="#9ca3af" fontSize={10} domain={[0, 100]} />
            <Tooltip
              contentStyle={{ backgroundColor: '#1f2937', border: 'none', borderRadius: '8px' }}
              labelStyle={{ color: '#9ca3af' }}
            />
            <Legend />
            {visible.avg && (
              <Line type="monotone" dataKey="avg" stroke={colors.avg} strokeWidth={2} dot={false} name="Avg" />
            )}
            {visible.max && (
              <Line type="monotone" dataKey="max" stroke={colors.max} strokeWidth={2} dot={false} name="Max" />
            )}
            {visible.min && (
              <Line type="monotone" dataKey="min" stroke={colors.min} strokeWidth={2} dot={false} name="Min" />
            )}
          </LineChart>
        </ResponsiveContainer>
      </div>
      {chartData.length === 0 && (
        <div className="absolute inset-0 flex items-center justify-center text-gray-500">
          No data available
        </div>
      )}
    </div>
  );
}