import fs from 'fs/promises';
import { SharedState, ProcessedPointedDOMElement } from '../types';
import logger from '../logger';
export default class SharedStateService {
static SHARED_STATE_PATH = '/tmp/mcp-pointer-shared-state.json';
public async saveState(state: SharedState): Promise<void> {
try {
const json = JSON.stringify(state, null, 2);
await fs.writeFile(SharedStateService.SHARED_STATE_PATH, json, 'utf8');
logger.debug('Pointed data saved to shared state file');
} catch (error) {
logger.error('Failed to save pointed data:', error);
}
}
public async getPointedElement(): Promise<ProcessedPointedDOMElement | null> {
const state = await this.readState();
if (!state) return null;
return state.data.processedPointedDOMElement;
}
private async readState(): Promise<SharedState | null> {
try {
const json = await fs.readFile(SharedStateService.SHARED_STATE_PATH, 'utf8');
return JSON.parse(json);
} catch (error) {
if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
logger.debug('Shared state file does not exist');
return null;
}
logger.error('Failed to read state file:', error);
return null;
}
}
}
