memory.ts

import { readFileSync, writeFileSync, existsSync, mkdirSync } from "fs";

const MEMORY_DIR = "./memory";
const MEMORY_FILE = `${MEMORY_DIR}/MEMORY.md`;

export function ensureMemoryDir() {
  if (!existsSync(MEMORY_DIR)) {
    mkdirSync(MEMORY_DIR, { recursive: true });
  }
}

export function readMemory(): string {
  ensureMemoryDir();
  if (!existsSync(MEMORY_FILE)) return "";
  return readFileSync(MEMORY_FILE, "utf-8");
}

export function writeMemory(content: string) {
  ensureMemoryDir();
  writeFileSync(MEMORY_FILE, content, "utf-8");
}

export function readDayLog(date: string): string {
  ensureMemoryDir();
  const path = `${MEMORY_DIR}/${date}.md`;
  if (!existsSync(path)) return "";
  return readFileSync(path, "utf-8");
}

export function appendDayLog(date: string, entry: string) {
  ensureMemoryDir();
  const path = `${MEMORY_DIR}/${date}.md`;
  const existing = existsSync(path) ? readFileSync(path, "utf-8") : "";
  writeFileSync(path, existing + entry + "\n", "utf-8");
}

export function getRecentDayLogs(days: number): string {
  const logs: string[] = [];
  const now = new Date();
  for (let i = 0; i < days; i++) {
    const d = new Date(now);
    d.setDate(d.getDate() - i);
    const dateStr = d.toISOString().slice(0, 10);
    const log = readDayLog(dateStr);
    if (log) {
      logs.push(`## ${dateStr}\n${log}`);
    }
  }
  return logs.join("\n\n");
}