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* @fileoverview Auto-save Hook
* @description Automatically saves and loads simulation state to localStorage
* @module hooks/useAutoSave
*/
import { useEffect, useCallback, useRef } from 'react';
const STORAGE_KEY = 'molecular-dynamics-autosave';
const AUTO_SAVE_INTERVAL = 30000; // 30 seconds
/**
* Fields to save (exclude transient/computed fields)
*/
const SAVEABLE_FIELDS = [
'atoms',
'bonds',
'nextAtomId',
'playerId',
'isPaused',
'targetTemperature',
'zoom',
'pan',
'showBonds',
'showVelocityVectors',
'showAtomLabels',
'showBondLengths',
'boundaryCondition',
'timeStepMultiplier',
'thermostatEnabled',
'thermostatTau',
'enableCoulomb',
'colorByVelocity',
'showMotionTrails',
'trailLength',
'theme',
];
/**
* Extract saveable state from simulation
* @param {Object} state - Full simulation state
* @returns {Object} State subset safe for saving
*/
const extractSaveableState = (state) => {
const saveState = {};
SAVEABLE_FIELDS.forEach(field => {
if (state[field] !== undefined) {
saveState[field] = state[field];
}
});
saveState.savedAt = Date.now();
saveState.version = '1.0.0';
return saveState;
};
/**
* Auto-save hook for simulation state persistence
* @param {Object} simulation - Current simulation state
* @param {Function} dispatch - Dispatch function
* @returns {Object} Auto-save controls
*/
export function useAutoSave(simulation, dispatch) {
const lastSaveRef = useRef(null);
const intervalRef = useRef(null);
/**
* Save current state to localStorage
*/
const saveState = useCallback(() => {
if (!simulation.autoSaveEnabled) return false;
try {
const saveData = extractSaveableState(simulation);
localStorage.setItem(STORAGE_KEY, JSON.stringify(saveData));
lastSaveRef.current = Date.now();
dispatch({ type: 'SET_LAST_AUTO_SAVE', payload: lastSaveRef.current });
return true;
} catch (error) {
console.warn('Auto-save failed:', error);
return false;
}
}, [simulation, dispatch]);
/**
* Load state from localStorage
*/
const loadState = useCallback(() => {
try {
const saved = localStorage.getItem(STORAGE_KEY);
if (!saved) return null;
const data = JSON.parse(saved);
// Validate version compatibility
if (!data.version || !data.atoms) {
console.warn('Invalid save data format');
return null;
}
return data;
} catch (error) {
console.warn('Load state failed:', error);
return null;
}
}, []);
/**
* Clear saved state
*/
const clearSavedState = useCallback(() => {
try {
localStorage.removeItem(STORAGE_KEY);
return true;
} catch (error) {
console.warn('Clear save failed:', error);
return false;
}
}, []);
/**
* Check if saved state exists
*/
const hasSavedState = useCallback(() => {
return localStorage.getItem(STORAGE_KEY) !== null;
}, []);
/**
* Restore simulation from saved state
*/
const restoreState = useCallback(() => {
const savedState = loadState();
if (!savedState) return false;
dispatch({ type: 'LOAD_SIMULATION_STATE', payload: savedState });
return true;
}, [loadState, dispatch]);
// Set up auto-save interval
useEffect(() => {
if (!simulation.autoSaveEnabled) {
Iif (intervalRef.current) {
clearInterval(intervalRef.current);
intervalRef.current = null;
}
return;
}
intervalRef.current = setInterval(() => {
Iif (!simulation.isPaused && simulation.atoms.length > 0) {
saveState();
}
}, AUTO_SAVE_INTERVAL);
return () => {
Eif (intervalRef.current) {
clearInterval(intervalRef.current);
}
};
}, [simulation.autoSaveEnabled, simulation.isPaused, simulation.atoms.length, saveState]);
// Save on page unload
useEffect(() => {
const handleBeforeUnload = () => {
if (simulation.autoSaveEnabled && simulation.atoms.length > 0) {
saveState();
}
};
window.addEventListener('beforeunload', handleBeforeUnload);
return () => window.removeEventListener('beforeunload', handleBeforeUnload);
}, [simulation.autoSaveEnabled, simulation.atoms.length, saveState]);
return {
saveState,
loadState,
clearSavedState,
hasSavedState,
restoreState,
lastSave: lastSaveRef.current,
};
}
export default useAutoSave;
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