import localforage from "localforage";

class Storage {
  constructor() {
    this.session = new Session();
    this.local = new Local();
  }
}

class Session {
  setObject(key, value) {
    sessionStorage.setItem(key, JSON.stringify(value));
  }

  getObject(key) {
    return JSON.parse(sessionStorage.getItem(key));
  }

  delete(key) {
    sessionStorage.removeItem(key);
  }

  setText(key, value) {
    sessionStorage.setItem(key, value);
  }

  getText(key) {
    return sessionStorage.getItem(key);
  }
}

class Local {
  setObject(key, value) {
    return localforage.setItem(key, JSON.stringify(value));
  }

  getObject(key) {
    return JSON.parse(localforage.getItem(key));
  }

  delete(key) {
    return localforage.removeItem(key);
  }

  setText(key, value) {
    return localforage.setItem(key, value);
  }

  getText(key) {
    return localforage.getItem(key);
  }

  getUseSize() {
    var size = 0;
    for (let i = 0, len = localStorage.length; i < len; i++) {
      let key = localStorage.key(i);
      if (null == key) {
        continue;
      }
      let value = localStorage.getItem(key);
      if (null != value) {
        size += value.length;
      }
    }
    return size;
  }

  getAvailableSize() {
    return 5 * 1024 * 1024 - storage.local.getUseSize();
  }

  dynamicClear() {
    if (storage.local.getAvailableSize() < 1 * 1024 * 1024) {
      //remove commited
      for (let i = 0, len = localStorage.length; i < len; i++) {
        let key = localStorage.key(i);

        if (null == key) {
          continue;
        }

        let value = localStorage.getItem(key);
        if (key.length == 37 && key.endsWith(".text") && value.length > 50) {
          let fl = value.substring(35, 36);
          if (fl == "1") {
            localStorage.removeItem(key);
          }
        }
      }
    }
  }

  dynamicDeepClear(ctt, excludeKey) {
    if (!ctt) {
      return;
    }

    //remove expired
    let availableSize = storage.local.getAvailableSize();

    for (
      let i = 0, len = localStorage.length;
      i < len && availableSize < 2 * 1024 * 1024;
      i++
    ) {
      let key = localStorage.key(i);
      if (null == key) {
        continue;
      }

      if (key.indexOf(excludeKey) >= 0) {
        continue;
      }

      let value = localStorage.getItem(key);

      if (key.length == 37 && key.endsWith(".text") && value.length > 50) {
        let starray = value.split("|");
        let fl = starray[2];
        let ts = starray[3];

        if (fl == "0") {
          if (ctt - ts > 3 * 24 * 3600 * 1000) {
            localStorage.removeItem(key);
            availableSize = availableSize + value.length;
          }
        }
      }
    }
  }
}

const storage = new Storage();
export default storage;