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import {
Flyer,
FlyerItem,
MasterGroceryItem,
AnalysisType,
AiAnalysisState,
AiAnalysisAction,
} from '../types';
import { AiAnalysisService } from '../services/aiAnalysisService';
import { logger } from '../services/logger.client';
/**
* The initial state for the AI analysis reducer.
*/
const initialState: AiAnalysisState = {
loadingAnalysis: null,
error: null,
results: {},
sources: {},
generatedImageUrl: null,
};
/**
* A reducer function to manage the complex state of the AI analysis panel.
* It handles loading, success, and error states for multiple types of analysis.
* @param state - The current state.
* @param action - The action to perform.
* @returns The new state.
*/
export function aiAnalysisReducer(
state: AiAnalysisState,
action: AiAnalysisAction,
): AiAnalysisState {
// Safely log the payload only if it exists on the action.
const payload = 'payload' in action ? action.payload : {};
logger.info(`[aiAnalysisReducer] Dispatched action: ${action.type}`, { payload });
switch (action.type) {
case 'FETCH_START':
return {
...state,
loadingAnalysis: action.payload.analysisType,
error: null, // Clear previous errors on a new request
};
case 'FETCH_SUCCESS_TEXT':
return {
...state,
loadingAnalysis: null,
results: {
...state.results,
[action.payload.analysisType]: action.payload.data,
},
};
case 'FETCH_SUCCESS_GROUNDED':
return {
...state,
loadingAnalysis: null,
results: {
...state.results,
[action.payload.analysisType]: action.payload.data.text,
},
sources: {
...state.sources,
[action.payload.analysisType]: action.payload.data.sources,
},
};
case 'FETCH_SUCCESS_IMAGE':
return {
...state,
loadingAnalysis: null,
generatedImageUrl: `data:image/png;base64,${action.payload.data}`,
};
case 'FETCH_ERROR':
return {
...state,
loadingAnalysis: null,
error: action.payload.error,
};
case 'CLEAR_ERROR':
return { ...state, error: null };
case 'RESET_STATE':
return initialState;
default:
return state;
}
}
interface UseAiAnalysisParams {
flyerItems: FlyerItem[];
selectedFlyer: Flyer | null;
watchedItems: MasterGroceryItem[];
// The service is now a required dependency.
service: AiAnalysisService;
}
export const useAiAnalysis = ({
flyerItems,
selectedFlyer,
watchedItems,
service,
}: UseAiAnalysisParams) => {
const [state, dispatch] = useReducer(aiAnalysisReducer, initialState);
const runAnalysis = useCallback(
async (analysisType: AnalysisType) => {
dispatch({ type: 'FETCH_START', payload: { analysisType } });
try {
// Delegate the call to the injected service.
switch (analysisType) {
case AnalysisType.QUICK_INSIGHTS: {
const data = await service.getQuickInsights(flyerItems);
dispatch({ type: 'FETCH_SUCCESS_TEXT', payload: { analysisType, data } });
break;
}
case AnalysisType.DEEP_DIVE: {
const data = await service.getDeepDiveAnalysis(flyerItems);
dispatch({ type: 'FETCH_SUCCESS_TEXT', payload: { analysisType, data } });
break;
}
case AnalysisType.WEB_SEARCH: {
const data = await service.searchWeb(flyerItems);
dispatch({ type: 'FETCH_SUCCESS_GROUNDED', payload: { analysisType, data } });
break;
}
case AnalysisType.PLAN_TRIP: {
if (!selectedFlyer?.store)
throw new Error('Store information is not available for trip planning.');
const data = await service.planTripWithMaps(flyerItems, selectedFlyer.store);
dispatch({ type: 'FETCH_SUCCESS_GROUNDED', payload: { analysisType, data } });
break;
}
case AnalysisType.COMPARE_PRICES: {
const data = await service.compareWatchedItemPrices(watchedItems);
dispatch({ type: 'FETCH_SUCCESS_GROUNDED', payload: { analysisType, data } });
break;
}
}
} catch (err: unknown) {
logger.error(`runAnalysis failed for type ${analysisType}`, { error: err });
const message = err instanceof Error ? err.message : 'An unexpected error occurred.';
dispatch({ type: 'FETCH_ERROR', payload: { error: message } });
}
},
[service, flyerItems, watchedItems, selectedFlyer],
);
const generateImage = useCallback(async () => {
const mealPlanText = state.results[AnalysisType.DEEP_DIVE];
if (!mealPlanText) {
logger.warn('generateImage called but no meal plan text available.');
return;
}
dispatch({ type: 'FETCH_START', payload: { analysisType: AnalysisType.GENERATE_IMAGE } });
try {
const data = await service.generateImageFromText(mealPlanText);
dispatch({ type: 'FETCH_SUCCESS_IMAGE', payload: { data } });
} catch (err: unknown) {
logger.error('generateImage failed', { error: err });
const message =
err instanceof Error
? err.message
: 'An unexpected error occurred during image generation.';
dispatch({ type: 'FETCH_ERROR', payload: { error: message } });
}
}, [service, state.results]);
const clearError = useCallback(() => {
dispatch({ type: 'CLEAR_ERROR' });
}, []);
const resetAnalysis = useCallback(() => {
dispatch({ type: 'RESET_STATE' });
}, []);
return useMemo(
() => ({
...state,
runAnalysis,
generateImage,
clearError,
resetAnalysis,
}),
[state, runAnalysis, generateImage, clearError, resetAnalysis],
);
};
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