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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import React, {
createContext,
useContext,
useState,
useMemo,
useCallback,
} from 'react';
import { type GenerateContentResponseUsageMetadata } from '@google/genai';
// --- Interface Definitions ---
export interface CumulativeStats {
turnCount: number;
promptTokenCount: number;
candidatesTokenCount: number;
totalTokenCount: number;
cachedContentTokenCount: number;
toolUsePromptTokenCount: number;
thoughtsTokenCount: number;
apiTimeMs: number;
}
interface SessionStatsState {
sessionStartTime: Date;
cumulative: CumulativeStats;
currentTurn: CumulativeStats;
currentResponse: CumulativeStats;
}
// Defines the final "value" of our context, including the state
// and the functions to update it.
interface SessionStatsContextValue {
stats: SessionStatsState;
startNewTurn: () => void;
addUsage: (
metadata: GenerateContentResponseUsageMetadata & { apiTimeMs?: number },
) => void;
}
// --- Context Definition ---
const SessionStatsContext = createContext<SessionStatsContextValue | undefined>(
undefined,
);
// --- Helper Functions ---
/**
* A small, reusable helper function to sum token counts.
* It unconditionally adds all token values from the source to the target.
* @param target The object to add the tokens to (e.g., cumulative, currentTurn).
* @param source The metadata object from the API response.
*/
const addTokens = (
target: CumulativeStats,
source: GenerateContentResponseUsageMetadata & { apiTimeMs?: number },
) => {
target.candidatesTokenCount += source.candidatesTokenCount ?? 0;
target.thoughtsTokenCount += source.thoughtsTokenCount ?? 0;
target.totalTokenCount += source.totalTokenCount ?? 0;
target.apiTimeMs += source.apiTimeMs ?? 0;
target.promptTokenCount += source.promptTokenCount ?? 0;
target.cachedContentTokenCount += source.cachedContentTokenCount ?? 0;
target.toolUsePromptTokenCount += source.toolUsePromptTokenCount ?? 0;
};
// --- Provider Component ---
export const SessionStatsProvider: React.FC<{ children: React.ReactNode }> = ({
children,
}) => {
const [stats, setStats] = useState<SessionStatsState>({
sessionStartTime: new Date(),
cumulative: {
turnCount: 0,
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
},
currentTurn: {
turnCount: 0,
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
},
currentResponse: {
turnCount: 0,
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
},
});
// A single, internal worker function to handle all metadata aggregation.
const aggregateTokens = useCallback(
(
metadata: GenerateContentResponseUsageMetadata & { apiTimeMs?: number },
) => {
setStats((prevState) => {
const newCumulative = { ...prevState.cumulative };
const newCurrentTurn = { ...prevState.currentTurn };
const newCurrentResponse = {
turnCount: 0,
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
};
// Add all tokens to the current turn's stats as well as cumulative stats.
addTokens(newCurrentTurn, metadata);
addTokens(newCumulative, metadata);
addTokens(newCurrentResponse, metadata);
return {
...prevState,
cumulative: newCumulative,
currentTurn: newCurrentTurn,
currentResponse: newCurrentResponse,
};
});
},
[],
);
const startNewTurn = useCallback(() => {
setStats((prevState) => ({
...prevState,
cumulative: {
...prevState.cumulative,
turnCount: prevState.cumulative.turnCount + 1,
},
currentTurn: {
turnCount: 0, // Reset for the new turn's accumulation.
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
},
currentResponse: {
turnCount: 0,
promptTokenCount: 0,
candidatesTokenCount: 0,
totalTokenCount: 0,
cachedContentTokenCount: 0,
toolUsePromptTokenCount: 0,
thoughtsTokenCount: 0,
apiTimeMs: 0,
},
}));
}, []);
const value = useMemo(
() => ({
stats,
startNewTurn,
addUsage: aggregateTokens,
}),
[stats, startNewTurn, aggregateTokens],
);
return (
<SessionStatsContext.Provider value={value}>
{children}
</SessionStatsContext.Provider>
);
};
// --- Consumer Hook ---
export const useSessionStats = () => {
const context = useContext(SessionStatsContext);
if (context === undefined) {
throw new Error(
'useSessionStats must be used within a SessionStatsProvider',
);
}
return context;
};
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