import { BarChart, Bar, XAxis, YAxis, Tooltip, ResponsiveContainer, Cell } from "recharts";

const COLORS = ["#6366f1", "#8b5cf6", "#a78bfa", "#c4b5fd", "#818cf8", "#7c3aed"];

interface TokenUsageChartProps {
  tokenUsage: Record<string, number>;
}

export function TokenUsageChart({ tokenUsage }: TokenUsageChartProps) {
  const data = Object.entries(tokenUsage).map(([name, tokens]) => ({
    name,
    tokens,
  }));

  if (data.length === 0) {
    return (
      <div className="flex items-center justify-center h-32 text-xs text-muted-foreground">
        No token data yet
      </div>
    );
  }

  return (
    <div className="h-40">
      <ResponsiveContainer width="100%" height="100%">
        <BarChart data={data} margin={{ top: 5, right: 5, bottom: 5, left: 5 }}>
          <XAxis
            dataKey="name"
            tick={{ fontSize: 10 }}
            interval={0}
            angle={-20}
            textAnchor="end"
          />
          <YAxis tick={{ fontSize: 10 }} width={40} />
          <Tooltip
            contentStyle={{ fontSize: 12 }}
            formatter={(value: number) => [`${value} tokens`, "Usage"]}
          />
          <Bar dataKey="tokens" radius={[4, 4, 0, 0]}>
            {data.map((_, i) => (
              <Cell key={i} fill={COLORS[i % COLORS.length]} />
            ))}
          </Bar>
        </BarChart>
      </ResponsiveContainer>
    </div>
  );
}