import path from "path";
import { fileURLToPath } from "url";

import Logs from "../libs/logs.js";
import Cache from "../libs/cache.js";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const STORE_FILE = path.join(__dirname, '../data/store.json');

const STORE_DATA = {};
const STORE_OPTIONS = {
  saveVersion: 0,
  updateVersion: 0,
};

/**
 * 判断是否为普通对象
 * @param {*} obj
 * @returns
 */
const isPlainObject = (obj) => {
  if (Object.prototype.toString.call(obj) !== '[object Object]') return false;

  const proto = Object.getPrototypeOf(obj);
  return proto === Object.prototype || proto === null;
}

/**
 * 初始化数据
 */
const initStore = () => {
  Cache.getData(STORE_FILE).then(data => {
    Logs.out('load store data', data);
    Object.assign(STORE_DATA, data);
  }).catch(error => {
    Logs.out('not load store data', error.message);
  });
}

/**
 * 保存数据
 */
const saveStore = () => {
  Cache.setData(STORE_FILE, STORE_DATA, 0).catch(error => {
    Logs.out('save cache failed', error);
  });
}

/**
 * 获取数据
 * @param {*} key
 * @param {*} property
 */
export const get = (key, property) => {
  if (!key) {
    return STORE_DATA;
  }
  if (property) {
    return STORE_DATA[property]?.[key] ?? null;
  }
  return STORE_DATA[key] ?? null;
}

/**
 * 设置数据
 * @param {*} key
 * @param {*} value
 * @param {*} property
 */
export const set = (key, value, property) => {
  if (typeof(key) == 'string' && typeof(value) != 'undefined') {
    if (property && typeof(property) == 'string') {
      if (!STORE_DATA[property]) {
        STORE_DATA[property] = {};
      }
      STORE_DATA[property][key] = value;
    }
    else {
      STORE_DATA[key] = value;
    }
    STORE_OPTIONS.updateVersion = Date.now();
  }
  else if (isPlainObject(key)) {
    if (value && typeof(value) == 'string') {
      property = value;
      value = key;
      if (!STORE_DATA[property]) {
        STORE_DATA[property] = {};
      }
      Object.assign(STORE_DATA[property], value);
    }
    else {
      value = key;
      Object.assign(STORE_DATA, value);
    }
    STORE_OPTIONS.updateVersion = Date.now();
  }
  else {
    Logs.out('invalid key or value', key, value);
  }
}

export const remove = (key, property) => {
  if (property && STORE_DATA[property]) {
    delete STORE_DATA[property][key];
  }
  else if (!property) {
    delete STORE_DATA[key];
  }
  STORE_OPTIONS.updateVersion = Date.now();
}

/**
 * 自动保存数据
 */
const autoSaveStore = () => {
  if (STORE_OPTIONS.updateVersion > STORE_OPTIONS.saveVersion) {
    saveStore();
    STORE_OPTIONS.saveVersion = STORE_OPTIONS.updateVersion;
  }
  setTimeout(() => {
    autoSaveStore();
  }, 1000 * 60);
}

/**
 * 进程结束时保存数据
 */
process.on('exit', saveStore);
process.on('SIGINT', () => {
  process.exit(0);
});
process.on('SIGTERM', () => {
  process.exit(0);
});
process.on('SIGUSR2', () => {
  process.exit(0);
});

// 初始化缓存
initStore();
// 自动保存数据
autoSaveStore();

export default { get, set, remove };