/**
 * @file navigationAutomat.js
 * @description Stores the user's most recently visited delivery document path,
 * article SKU, article search term/path, and category slug/path to preserve
 * navigation context across primary and secondary section switches.
 *
 * Upstream Triggers:
 * - UI / Routes: Set by article search, category navigation, and delivery views/routes
 *   via `setLastDeliveryPath(path)`, `setLastArticleSku(sku)`, `setLastSearchTerm(term, path)`,
 *   `setLastCategorySlug(slug)`, and `clearNavigation()`.
 */

import { Automat } from 'react-automat';
import categoryAutomat from './categoryAutomat';
import { buildCategoryPath, resolveCategoryIdFromSlugPath } from '../components/category/categoryRoute';
import { buildSearchUrl } from '../components/article/artikelQuery';

/**
 * @typedef {Object} NavigationState
 * @property {string|null} lastDeliveryPath Last delivery path visited by the user.
 * @property {string|null} lastArticleSku Last article SKU visited by the user.
 * @property {string|null} lastSearchTerm Last article search query term.
 * @property {string|null} lastArticleSearchPath Full last search path (e.g. `/artikel?target=apfel`).
 * @property {string|null} lastCategoryId Last visited category ID.
 * @property {string|null} lastCategorySlug Last visited category slug (e.g. `obst-gemuese/obst`).
 * @property {string|null} lastCategoryPath Full last category path (e.g. `/kategorien/obst-gemuese/obst`).
 */

/** @type {NavigationState} */
const initialState = {
  lastDeliveryPath: null,
  lastArticleSku: null,
  lastSearchTerm: null,
  lastArticleSearchPath: null,
  lastCategoryId: null,
  lastCategorySlug: null,
  lastCategoryPath: null,
};

/**
 * Stores the user's most recently visited delivery, article, search term, and category
 * so main-menu and sub-menu navigation can restore the previous context.
 *
 * @type {Automat<NavigationState>}
 */
const navigationAutomat = new Automat(
  initialState,
  {
    /**
     * Set the last visited delivery path.
     *
     * @param {string|null} path Full path such as `/lieferung/19` or `/lieferung/neu`.
     * @returns {void}
     */
    setLastDeliveryPath(path) {
      navigationAutomat.setState({ lastDeliveryPath: path });
    },

    /**
     * Set the last visited article SKU.
     *
     * @param {string|null} sku
     * @returns {void}
     */
    setLastArticleSku(sku) {
      navigationAutomat.setState({ lastArticleSku: sku });
    },

    /**
     * Set the last active article search term and optional search URL.
     *
     * @param {string|null} term Search input term.
     * @param {string|null} [path] Full search URL.
     * @returns {void}
     */
    setLastSearchTerm(term, path = null) {
      const trimmed = term != null ? String(term) : '';
      const currentCatId = navigationAutomat.state.lastCategoryId ?? '';
      const searchPath = path ?? buildSearchUrl(trimmed, currentCatId, 0);
      navigationAutomat.setState({
        lastSearchTerm: trimmed || null,
        lastArticleSearchPath: searchPath,
      });
    },

    /**
     * Set the full last article search URL path.
     *
     * @param {string|null} path Full search URL path (e.g. `/artikel?target=apfel`).
     * @param {string|null} [term] Search term.
     * @returns {void}
     */
    setLastArticleSearchPath(path, term = null) {
      navigationAutomat.setState({
        lastArticleSearchPath: path,
        ...(term !== null ? { lastSearchTerm: term } : {}),
      });
    },

    /**
     * Set the active category ID and keep categoryPath & articleSearchPath in sync.
     *
     * @param {string|number|null} categoryId Category ID or null for root.
     * @param {string|null} [path] Full category path if already known.
     * @returns {void}
     */
    setLastCategoryId(categoryId, path = null) {
      const id = categoryId != null ? String(categoryId) : null;
      const categories = categoryAutomat.state?.categories;
      const rootCategoryId = categoryAutomat.state?.rootCategoryId;
      const isRoot = !id || (rootCategoryId != null && id === String(rootCategoryId));

      let categoryPath = path;
      if (!categoryPath) {
        if (!isRoot && categories && rootCategoryId != null) {
          categoryPath = buildCategoryPath(categories, rootCategoryId, id);
        } else {
          categoryPath = '/kategorien';
        }
      }

      const cleanSlug = categoryPath.replace(/^\/kategorien\/?/, '').replace(/\/+$/, '') || null;
      const currentTerm = navigationAutomat.state.lastSearchTerm ?? '';
      const filter = isRoot ? '' : id;
      const searchPath = buildSearchUrl(currentTerm, filter, 0);

      navigationAutomat.setState({
        lastCategoryId: isRoot ? null : id,
        lastCategorySlug: isRoot ? null : cleanSlug,
        lastCategoryPath: categoryPath,
        lastArticleSearchPath: searchPath,
      });
    },

    /**
     * Set the last visited category slug.
     *
     * @param {string|null} slug Category slug (e.g. `obst-gemuese/obst` or empty string for root).
     * @returns {void}
     */
    setLastCategorySlug(slug) {
      const clean = slug ? String(slug).replace(/^\/+|\/+$/g, '') : '';
      const path = clean ? `/kategorien/${clean}` : '/kategorien';
      navigationAutomat.actions.setLastCategoryPath(path);
    },

    /**
     * Set the full last category path.
     *
     * @param {string|null} path Full category path (e.g. `/kategorien/obst-gemuese/obst`).
     * @returns {void}
     */
    setLastCategoryPath(path) {
      const cleanPath = path ? String(path).replace(/^\/+/, '/') : '/kategorien';
      const slug = cleanPath.replace(/^\/kategorien\/?/, '').replace(/\/+$/, '') || null;
      const categories = categoryAutomat.state?.categories;
      const rootCategoryId = categoryAutomat.state?.rootCategoryId;
      const resolvedId = slug && categories && rootCategoryId != null
        ? resolveCategoryIdFromSlugPath(categories, rootCategoryId, slug)
        : null;
      const isRoot = !resolvedId || (rootCategoryId != null && String(resolvedId) === String(rootCategoryId));
      const catId = isRoot ? null : String(resolvedId);

      const currentTerm = navigationAutomat.state.lastSearchTerm ?? '';
      const filter = catId ?? '';
      const searchPath = buildSearchUrl(currentTerm, filter, 0);

      navigationAutomat.setState({
        lastCategoryId: catId,
        lastCategorySlug: isRoot ? null : slug,
        lastCategoryPath: cleanPath,
        lastArticleSearchPath: searchPath,
      });
    },

    /**
     * Clear all navigation history.
     *
     * @returns {void}
     */
    clearNavigation() {
      navigationAutomat.setState(initialState);
    },
  },
  {
    name: 'navigation',
    persist: false,
  }
);

export default navigationAutomat;
export const {
  setLastDeliveryPath,
  setLastArticleSku,
  setLastSearchTerm,
  setLastArticleSearchPath,
  setLastCategoryId,
  setLastCategorySlug,
  setLastCategoryPath,
  clearNavigation,
} = navigationAutomat.actions;