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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import React from 'react';
import { Box, Text } from 'ink';
import { Colors } from '../colors.js';
import { formatDuration } from '../utils/formatters.js';
import {
calculateAverageLatency,
calculateCacheHitRate,
calculateErrorRate,
} from '../utils/computeStats.js';
import { useSessionStats, ModelMetrics } from '../contexts/SessionContext.js';
const METRIC_COL_WIDTH = 28;
const MODEL_COL_WIDTH = 22;
interface StatRowProps {
title: string;
values: Array<string | React.ReactElement>;
isSubtle?: boolean;
isSection?: boolean;
}
const StatRow: React.FC<StatRowProps> = ({
title,
values,
isSubtle = false,
isSection = false,
}) => (
<Box>
<Box width={METRIC_COL_WIDTH}>
<Text bold={isSection} color={isSection ? undefined : Colors.LightBlue}>
{isSubtle ? ` ↳ ${title}` : title}
</Text>
</Box>
{values.map((value, index) => (
<Box width={MODEL_COL_WIDTH} key={index}>
<Text>{value}</Text>
</Box>
))}
</Box>
);
export const ModelStatsDisplay: React.FC = () => {
const { stats } = useSessionStats();
const { models } = stats.metrics;
const activeModels = Object.entries(models).filter(
([, metrics]) => metrics.api.totalRequests > 0,
);
if (activeModels.length === 0) {
return (
<Box
borderStyle="round"
borderColor={Colors.Gray}
paddingY={1}
paddingX={2}
>
<Text>No API calls have been made in this session.</Text>
</Box>
);
}
const modelNames = activeModels.map(([name]) => name);
const getModelValues = (
getter: (metrics: ModelMetrics) => string | React.ReactElement,
) => activeModels.map(([, metrics]) => getter(metrics));
const hasThoughts = activeModels.some(
([, metrics]) => metrics.tokens.thoughts > 0,
);
const hasTool = activeModels.some(([, metrics]) => metrics.tokens.tool > 0);
const hasCached = activeModels.some(
([, metrics]) => metrics.tokens.cached > 0,
);
return (
<Box
borderStyle="round"
borderColor={Colors.Gray}
flexDirection="column"
paddingY={1}
paddingX={2}
>
<Text bold color={Colors.AccentPurple}>
Model Stats For Nerds
</Text>
<Box height={1} />
{/* Header */}
<Box>
<Box width={METRIC_COL_WIDTH}>
<Text bold>Metric</Text>
</Box>
{modelNames.map((name) => (
<Box width={MODEL_COL_WIDTH} key={name}>
<Text bold>{name}</Text>
</Box>
))}
</Box>
{/* Divider */}
<Box
borderStyle="single"
borderBottom={true}
borderTop={false}
borderLeft={false}
borderRight={false}
/>
{/* API Section */}
<StatRow title="API" values={[]} isSection />
<StatRow
title="Requests"
values={getModelValues((m) => m.api.totalRequests.toLocaleString())}
/>
<StatRow
title="Errors"
values={getModelValues((m) => {
const errorRate = calculateErrorRate(m);
return (
<Text
color={
m.api.totalErrors > 0 ? Colors.AccentRed : Colors.Foreground
}
>
{m.api.totalErrors.toLocaleString()} ({errorRate.toFixed(1)}%)
</Text>
);
})}
/>
<StatRow
title="Avg Latency"
values={getModelValues((m) => {
const avgLatency = calculateAverageLatency(m);
return formatDuration(avgLatency);
})}
/>
<Box height={1} />
{/* Tokens Section */}
<StatRow title="Tokens" values={[]} isSection />
<StatRow
title="Total"
values={getModelValues((m) => (
<Text color={Colors.AccentYellow}>
{m.tokens.total.toLocaleString()}
</Text>
))}
/>
<StatRow
title="Prompt"
isSubtle
values={getModelValues((m) => m.tokens.prompt.toLocaleString())}
/>
{hasCached && (
<StatRow
title="Cached"
isSubtle
values={getModelValues((m) => {
const cacheHitRate = calculateCacheHitRate(m);
return (
<Text color={Colors.AccentGreen}>
{m.tokens.cached.toLocaleString()} ({cacheHitRate.toFixed(1)}%)
</Text>
);
})}
/>
)}
{hasThoughts && (
<StatRow
title="Thoughts"
isSubtle
values={getModelValues((m) => m.tokens.thoughts.toLocaleString())}
/>
)}
{hasTool && (
<StatRow
title="Tool"
isSubtle
values={getModelValues((m) => m.tokens.tool.toLocaleString())}
/>
)}
<StatRow
title="Output"
isSubtle
values={getModelValues((m) => m.tokens.candidates.toLocaleString())}
/>
</Box>
);
};
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