import { Notify } from 'quasar';
import { api } from 'boot/axios';
import { boot } from 'quasar/wrappers';
import routes from 'src/router/routes';
import { AxiosResponse } from 'axios';
import { RouteRecordRaw } from 'vue-router';
import { FG_Plugin } from '@flaschengeist/types';

/****************************************************
 ******** Internal area for some magic **************
 ****************************************************/

declare type ImportPlgn = { default: FG_Plugin.Plugin };

function validatePlugin(plugin: FG_Plugin.Plugin) {
  return (
    typeof plugin.name === 'string' &&
    typeof plugin.id === 'string' &&
    plugin.id.length > 0 &&
    typeof plugin.version === 'string'
  );
}

/* eslint-disable */
// This functions are used by webpack magic
// Called when import promise resolved
function success(value: ImportPlgn, path: string) {
  if (validatePlugin(value.default)) PLUGINS.plugins.set(value.default.id, value.default);
  else failure(path);
}
// Called when import promise rejected
function failure(path = 'unknown') {
  console.error(`Plugin ${path} could not be found and not imported`);
}
/* eslint-enable */

// Here does some magic happens, WebPack will automatically replace the following comment with the import statements
const PLUGINS = {
  context: <Array<() => Promise<ImportPlgn>>>[
    /*INSERT_PLUGIN_LIST*/
  ],
  plugins: new Map<string, FG_Plugin.Plugin>(),
};

interface BackendPlugin {
  permissions: string[];
  version: string;
}

interface BackendPlugins {
  [key: string]: BackendPlugin;
}

interface Backend {
  plugins: BackendPlugins;
  version: string;
}
export { Backend };

// Handle Notifications
export const translateNotification = (note: FG.Notification): FG_Plugin.Notification => note;

// Combine routes, shortcuts and widgets from plugins

/**
 * Helper function, set permissions from MenuRoute to meta from RouteRecordRaw
 * @param object MenuRoute to set route meta
 */
function setPermissions(object: FG_Plugin.MenuRoute) {
  if (object.permissions !== undefined) {
    if (object.route.meta === undefined) object.route.meta = {};
    object.route.meta['permissions'] = object.permissions;
  }
}

/**
 * Helper function to convert MenuRoute to the parents RouteRecordRaw
 * @param parent Parent RouteRecordRaw
 * @param children MenuRoute to convert
 */
function convertRoutes(parent: RouteRecordRaw, children?: FG_Plugin.MenuRoute[]) {
  if (children !== undefined) {
    children.forEach((child) => {
      setPermissions(child);
      convertRoutes(child.route, child.children);
      if (parent.children === undefined) parent.children = [];
      parent.children.push(child.route);
    });
  }
}

/**
 * Combines routes from plugin MenuRoute to Vue-Router RouteRecordRaw to get a clean route-tree
 * @param target
 * @param source
 * @param mainPath
 */
function combineMenuRoutes(
  target: RouteRecordRaw[],
  source: FG_Plugin.MenuRoute[],
  mainPath: '/' | '/in' = '/'
): RouteRecordRaw[] {
  // Search parent
  target.forEach((target) => {
    if (target.path === mainPath) {
      // Parent found = target
      source.forEach((sourceMainConfig: FG_Plugin.MenuRoute) => {
        // Check if source is already in target
        const targetMainConfig = target.children?.find((targetMainConfig: RouteRecordRaw) => {
          return sourceMainConfig.route.path === targetMainConfig.path;
        });
        // Already in target routes, add only children
        if (targetMainConfig) {
          convertRoutes(targetMainConfig, sourceMainConfig.children);
        } else {
          // Append to target
          if (target.children === undefined) {
            target.children = [];
          }
          convertRoutes(sourceMainConfig.route, sourceMainConfig.children);
          if (
            sourceMainConfig.children &&
            sourceMainConfig.children.length > 0 &&
            !sourceMainConfig.route.component
          )
            Object.assign(sourceMainConfig.route, {
              component: () => import('src/components/navigation/EmptyParent.vue'),
            });
          target.children.push(sourceMainConfig.route);
        }
      });
    }
  });
  return target;
}

function combineRoutes(
  target: RouteRecordRaw[],
  source: FG_Plugin.NamedRouteRecordRaw[],
  mainPath: '/' | '/in'
) {
  // Search parent
  target.forEach((target) => {
    if (target.path === mainPath) {
      // Parent found = target
      source.forEach((sourceRoute) => {
        // Check if source is already in target
        const targetRoot = target.children?.find(
          (targetRoot) => sourceRoute.path === targetRoot.path
        );
        // Already in target routes, add only children
        if (targetRoot) {
          if (targetRoot.children === undefined) targetRoot.children = [];
          targetRoot.children.push(...(sourceRoute.children || []));
        } else {
          // Append to target
          if (target.children === undefined) target.children = [];
          if (
            sourceRoute.children &&
            sourceRoute.children.length > 0 &&
            sourceRoute.component === undefined
          )
            Object.assign(sourceRoute, {
              component: () => import('src/components/navigation/EmptyParent.vue'),
            });
          target.children.push(sourceRoute);
        }
      });
    }
  });
}

/**
 * Combine MenuRoutes into Flaschengeist MenuLinks for the main menu
 * @param target Flaschengeist list of menu links
 * @param source MenuRoutes to combine
 */
function combineMenuLinks(target: FG_Plugin.MenuLink[], source: FG_Plugin.MenuRoute) {
  let idx = target.findIndex((link) => link.title == source.title);
  // Link not found, add new one
  if (idx === -1) {
    idx += target.push({
      title: source.title,
      icon: source.icon,
      link: source.route.name,
      permissions: source.permissions,
    });
  }
  if (target[idx].children === undefined) {
    target[idx].children = [];
  }
  source.children?.forEach((sourceChild) => {
    target[idx].children?.push({
      title: sourceChild.title,
      icon: sourceChild.icon,
      link: sourceChild.route.name,
      permissions: sourceChild.permissions,
    });
  });
}

/**
 * Combine shortcuts from Plugin MenuRouts into the Flaschenbeist Shortcut list
 * @param target Flaschengeist list of shortcuts
 * @param source MenuRoutes to extract shortcuts from
 */
function combineShortcuts(target: FG_Plugin.Shortcut[], source: FG_Plugin.MenuRoute[]) {
  source.forEach((route) => {
    if (route.shortcut) {
      target.push(<FG_Plugin.Shortcut>{
        link: route.route.name,
        icon: route.icon,
        permissions: route.permissions,
      });
    }
    if (route.children) {
      combineShortcuts(target, route.children);
    }
  });
}

/**
 * Load a Flaschengeist plugin
 * @param loadedPlugins Flaschgeist object
 * @param plugin Plugin to load
 * @param router VueRouter instance
 */
function loadPlugin(
  loadedPlugins: FG_Plugin.Flaschengeist,
  plugin: FG_Plugin.Plugin,
  backend: Backend
) {
  // Check if already loaded
  if (loadedPlugins.plugins.findIndex((p) => p.name === plugin.name) !== -1) return true;

  // Check backend dependencies
  if (
    !plugin.requiredModules.every(
      (required) =>
        backend.plugins[required[0]] !== undefined &&
        (required.length == 1 ||
          true) /* validate the version, semver440 from python is... tricky on node*/
    )
  ) {
    console.error(`Plugin ${plugin.name}: Backend modules not satisfied`);
    return false;
  }

  // Start combining and loading routes, shortcuts etc
  if (plugin.internalRoutes) {
    combineRoutes(loadedPlugins.routes, plugin.internalRoutes, '/in');
  }

  if (plugin.innerRoutes) {
    // Routes for Vue Router
    combineMenuRoutes(loadedPlugins.routes, plugin.innerRoutes, '/in');
    // Combine links for menu
    plugin.innerRoutes.forEach((route) => combineMenuLinks(loadedPlugins.menuLinks, route));
    // Combine shortcuts
    combineShortcuts(loadedPlugins.shortcuts, plugin.innerRoutes);
  }

  if (plugin.outerRoutes) {
    combineMenuRoutes(loadedPlugins.routes, plugin.outerRoutes);
    combineShortcuts(loadedPlugins.outerShortcuts, plugin.outerRoutes);
  }

  if (plugin.widgets.length > 0) {
    plugin.widgets.forEach((widget) => (widget.name = plugin.name + '_' + widget.name));
    Array.prototype.push.apply(loadedPlugins.widgets, plugin.widgets);
  }

  loadedPlugins.plugins.push({
    name: plugin.name,
    version: plugin.version,
    notification: plugin.notification?.bind({}) || translateNotification,
  });

  return true;
}

/**
 * Loading backend information
 * @returns Backend object or null
 */
async function getBackend() {
  try {
    const { data }: AxiosResponse<Backend> = await api.get('/');
    return data;
  } catch (e) {
    console.warn(e);
    return null;
  }
}

/**
 * Boot file, load all required plugins, check for dependencies
 */
export default boot(async ({ router, app }) => {
  const backend = await getBackend();
  if (!backend || typeof backend !== 'object' || !('plugins' in backend)) {
    console.log('Backend error');
    router.isReady().finally(() => void router.push({ name: 'offline', params: { refresh: 1 } }));
    return;
  }

  const loadedPlugins: FG_Plugin.Flaschengeist = {
    routes,
    plugins: [],
    menuLinks: [],
    shortcuts: [],
    outerShortcuts: [],
    widgets: [],
  };

  const BreakError = {};
  try {
    PLUGINS.plugins.forEach((plugin, name) => {
      if (!loadPlugin(loadedPlugins, plugin, backend)) {
        void router.push({ name: 'error' });

        Notify.create({
          type: 'negative',
          message: `Fehler beim Laden: Bitte wende dich an den Admin (error: PNF-${name}!`,
          timeout: 10000,
          progress: true,
        });
        throw BreakError;
      }
    });
  } catch (e) {
    if (e !== BreakError) throw e;
  }

  // Sort widgets by priority
  loadedPlugins.widgets.sort((a, b) => b.priority - a.priority);

  // Add loaded routes to router
  loadedPlugins.routes.forEach((route) => router.addRoute(route));

  // save plugins in VM-variable
  app.provide('flaschengeist', loadedPlugins);
});