import Vue from "vue";
import VueRouter from "vue-router";
import EditNote from "@/views/EditNote.vue";
import ViewNote from "@/views/ViewNote.vue";
import ErrorRoute from "@/views/ErrorRoute.vue";
import ErrorNote from "@/views/ErrorNote.vue";
import { getKeyMeta, getNoteMeta } from "@/api/note";
import { getStoreKey } from "@/api/lock";
import storage from "@/libs/storage";

Vue.use(VueRouter);

var keyMeta = null;
var noteMeta = null;
var errorMeta = null;

function getKeyMetaParam() {
  return keyMeta;
}

function getNoteMetaParam() {
  return noteMeta;
}

function getErrorMetaParam() {
  return errorMeta;
}

function getNoteView() {
  if (errorMeta) {
    return;
  }

  let path = location.pathname;

  let key = path.substring(1, path.length);

  if (keyMeta && keyMeta.key) {
    key = keyMeta.key;
  }

  let regKey = /^[abcdefhikmnopqstuvwxyz23456789]{16}$/;
  if (!regKey.test(key)) {
    errorMeta = 100002;
    return ErrorNote;
  }

  if (keyMeta && keyMeta.key) {
    //firstEdit
    return EditNote;
  }

  //set noteMeta
  noteMeta = getNoteMeta(key);

  //server error
  if (!noteMeta) {
    errorMeta = 100006;
    return ErrorNote;
  }

  //invalidated key
  if (!noteMeta.key) {
    errorMeta = 100002;
    return ErrorNote;
  }

  //validated state
  if (1 == noteMeta.state) {
    return ViewNote;
  }

  //deleted
  if (0 == noteMeta.state) {
    let storeKey = getStoreKey(key);
    storage.local.delete(storeKey);
    // user deleted
    if (noteMeta.ttl > 0) {
      errorMeta = 100003;
      return ErrorNote;
    } else {// timeout
      errorMeta = 100004;
      return ErrorNote;
    }
  }

  if (null == noteMeta.state) {
    let storeKey = getStoreKey(key);
    //if has storage , then edit
    if (storage.local.getText(storeKey)) {
      return EditNote;
    } else {
      //storage is empty 
      let df = storage.session.getText(storeKey + "_delete")
      if (df) {//unsubmitted,user deleted.
        errorMeta = 100003;
        return ErrorNote;
      } else {//unsubmitted
        errorMeta = 100005;
        return ErrorNote;
      }
    }
  }

  // other exception
  errorMeta = 100001;
  return ErrorNote;
}

function getHomeRedirect() {
  let path = location.pathname;
  if (path != "/") {
    return;
  }

  //setKeyMeta
  keyMeta = getKeyMeta();

  // server error
  if (!keyMeta) {
    errorMeta = 100006;
    return "/error_"+errorMeta;
  }

  return "/" + keyMeta.key;
}

const routes = [
  {
    path: "/",
    name: "home",
    redirect: getHomeRedirect(),
  },
  { path: "/error_:code([0-9]{6})", component: ErrorNote },
  {
    path: "/:name([a-z0-9]{10,20})",
    name: "note",
    component: getNoteView(),
    meta: { keyMeta: getKeyMetaParam(), noteMeta: getNoteMetaParam(), errorMeta: getErrorMetaParam() },
  },
  { path: "/:path(.*)", component: ErrorRoute }
];

const router = new VueRouter({
  routes,
  mode: "history",
});

export default router;