import {Ref, ref} from "@vue/reactivity";
import {useAccessProfileStore} from "~/stores/accessProfile";
import {useRuntimeConfig} from "#app";
import {useAbility} from "@casl/vue";
import {useOrganizationProfileStore} from "~/stores/organizationProfile";
import AbstractMenuBuilder from "~/services/menuBuilder/abstractMenuBuilder";
import {MenuGroup, MenuItem} from "~/types/layout";
import {usePageStore} from "~/stores/page";
import menus from "~/services/menuBuilder/_import";
import {MENU_LINK_TYPE} from "~/types/enum/layout";

/**
 * Renvoie des méthodes pour interagir avec les menus
 *
 * Exemple d'usage :
 *
 *     const { buildMenu, hasMenu } = useMenuBuilder()
 *     const menu = buildMenu('Main')
 *
 *     console.log(hasMenu('Main')) // true
 */
export const useMenu = () => {
  const runtimeConfig = useRuntimeConfig()
  const ability = useAbility()
  const organizationProfile = useOrganizationProfileStore()
  const accessProfile = useAccessProfileStore()
  const pageState = usePageStore()

  const getBuilder = (name: string): AbstractMenuBuilder => {
    if (!(name in menus)) {
      throw new Error('Unknown menu : ' + name)
    }
    const menuBuilder = menus[name]

    // @ts-ignore
    return new menuBuilder(runtimeConfig, ability, organizationProfile, accessProfile)
  }

  /**
   * Construit un menu à partir de son nom
   * Met à jour le store pour garder en mémoire la présence de ce menu et son état
   *
   * @param name
   */
  const buildMenu = (name: string): Ref<MenuGroup | null> => {
    const builder = getBuilder(name)

    const menu = builder.build() as MenuGroup

    // On enregistre l'état du menu dans le store de la page
    if (menu !== null && (menu.children ?? []).length > 0) {
      pageState.menusOpened[builder.getMenuName()] = false
      console.log('Menu ' + builder.getMenuName() + ' built (' + (menu.children ?? []).length+ ' entries)')
    }

    return ref(menu)
  }

  /**
   * L'utilisateur en cours a-t-il accès au menu portant ce nom ?
   *
   * @param name
   */
  const hasMenu = (name: string): boolean => {
    return name in pageState.menusOpened
  }

  /**
   * Soulève une erreur si aucun menu portant ce nom n'est enregistré dans le store
   *
   * @param name
   */
  const assertExists = (name: string) => {
    if (!(name in pageState.menusOpened)) {
      throw new Error('Unknown menu : ' + name)
    }
  }

  /**
   * Retourne vrai si le menu est actuellement ouvert / déplié
   *
   * @param name
   */
  const isMenuOpened = (name: string): boolean => {
    assertExists(name)
    return pageState.menusOpened[name]
  }

  /**
   * Met à jour l'état du menu portant ce nom
   *
   * @param name
   * @param state
   */
  const setMenuState = (name: string, state: boolean) => {
    assertExists(name)
    pageState.menusOpened[name] = state
  }

  /**
   * Ouvre / déplie le menu portant ce nom
   *
   * @param name
   */
  const openMenu = (name: string) => {
    setMenuState(name, true)
  }

  /**
   * Ferme / replie le menu portant ce nom
   *
   * @param name
   */
  const closeMenu = (name: string) => {
    setMenuState(name, false)
  }

  /**
   * Bascule l'état du menu entre ouvert et fermé
   *
   * @param name
   */
  const toggleMenu = (name: string) => {
    setMenuState(name, !pageState.menusOpened[name])
  }

  /**
   * Le lien menuItem est-il un lien interne à l'application
   *
   * @param menuItem
   */
  const isInternalLink = (menuItem: MenuItem | MenuGroup): boolean => {
    return 'type' in menuItem && menuItem.type === MENU_LINK_TYPE.INTERNAL
  }

  return {
    buildMenu,
    hasMenu,
    setMenuState,
    openMenu,
    closeMenu,
    toggleMenu,
    isMenuOpened,
    isInternalLink
  }
}