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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import {
SessionMetrics,
ComputedSessionStats,
ModelMetrics,
} from '../contexts/SessionContext.js';
export function calculateErrorRate(metrics: ModelMetrics): number {
if (metrics.api.totalRequests === 0) {
return 0;
}
return (metrics.api.totalErrors / metrics.api.totalRequests) * 100;
}
export function calculateAverageLatency(metrics: ModelMetrics): number {
if (metrics.api.totalRequests === 0) {
return 0;
}
return metrics.api.totalLatencyMs / metrics.api.totalRequests;
}
export function calculateCacheHitRate(metrics: ModelMetrics): number {
if (metrics.tokens.prompt === 0) {
return 0;
}
return (metrics.tokens.cached / metrics.tokens.prompt) * 100;
}
export const computeSessionStats = (
metrics: SessionMetrics,
): ComputedSessionStats => {
const { models, tools, files } = metrics;
const totalApiTime = Object.values(models).reduce(
(acc, model) => acc + model.api.totalLatencyMs,
0,
);
const totalToolTime = tools.totalDurationMs;
const agentActiveTime = totalApiTime + totalToolTime;
const apiTimePercent =
agentActiveTime > 0 ? (totalApiTime / agentActiveTime) * 100 : 0;
const toolTimePercent =
agentActiveTime > 0 ? (totalToolTime / agentActiveTime) * 100 : 0;
const totalCachedTokens = Object.values(models).reduce(
(acc, model) => acc + model.tokens.cached,
0,
);
const totalPromptTokens = Object.values(models).reduce(
(acc, model) => acc + model.tokens.prompt,
0,
);
const cacheEfficiency =
totalPromptTokens > 0 ? (totalCachedTokens / totalPromptTokens) * 100 : 0;
const totalDecisions =
tools.totalDecisions.accept +
tools.totalDecisions.reject +
tools.totalDecisions.modify;
const successRate =
tools.totalCalls > 0 ? (tools.totalSuccess / tools.totalCalls) * 100 : 0;
const agreementRate =
totalDecisions > 0
? (tools.totalDecisions.accept / totalDecisions) * 100
: 0;
return {
totalApiTime,
totalToolTime,
agentActiveTime,
apiTimePercent,
toolTimePercent,
cacheEfficiency,
totalDecisions,
successRate,
agreementRate,
totalCachedTokens,
totalPromptTokens,
totalLinesAdded: files.totalLinesAdded,
totalLinesRemoved: files.totalLinesRemoved,
};
};
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