import {
  existsSync,
  mkdirSync,
  readFileSync,
  writeFileSync,
  unlinkSync,
} from "node:fs";
import { join } from "node:path";
import { AGENT_USAGE_REMINDER_STORAGE } from "./constants";
import type { AgentUsageState } from "./types";

function getStoragePath(sessionID: string): string {
  return join(AGENT_USAGE_REMINDER_STORAGE, `${sessionID}.json`);
}

export function loadAgentUsageState(sessionID: string): AgentUsageState | null {
  const filePath = getStoragePath(sessionID);
  if (!existsSync(filePath)) return null;

  try {
    const content = readFileSync(filePath, "utf-8");
    return JSON.parse(content) as AgentUsageState;
  } catch {
    return null;
  }
}

export function saveAgentUsageState(state: AgentUsageState): void {
  if (!existsSync(AGENT_USAGE_REMINDER_STORAGE)) {
    mkdirSync(AGENT_USAGE_REMINDER_STORAGE, { recursive: true });
  }

  const filePath = getStoragePath(state.sessionID);
  writeFileSync(filePath, JSON.stringify(state, null, 2));
}

export function clearAgentUsageState(sessionID: string): void {
  const filePath = getStoragePath(sessionID);
  if (existsSync(filePath)) {
    unlinkSync(filePath);
  }
}