/**
 * Classic (shortcode) WooCommerce checkout.
 *
 * The form is rendered by PHP and nothing owns the fields afterwards, so the
 * widget is left to do the whole job: debounce, request, write, announce. Most
 * of this file is handing it the selectors WooCommerce uses and the settings
 * the store owner chose.
 *
 * Selectors are passed as strings rather than elements on purpose. The widget
 * resolves them on every use and delegates its listener from `document`, so a
 * theme or one-page-checkout plugin that re-renders the billing form does not
 * break the autofill.
 *
 * @module
 */

(function () {
  var config = window.cepisWooCommerce;

  if (!config || !window.CepisAutofill || !config.fields) {
    return;
  }

  var DIACRITIC = /[\u0300-\u036f]/g;

  /** Class the widget gives the region it announces through. */
  var STATUS = "cepis-autofill-status";

  /**
   * Compare labels the way a person would: accents and case do not count.
   *
   * @param {unknown} value Anything printable.
   * @returns {string}
   */
  function fold(value) {
    return String(value == null ? "" : value)
      .normalize("NFD")
      .replace(DIACRITIC, "")
      .trim()
      .toLowerCase();
  }

  /**
   * Set a value the way a person would, so validation in the page sees it.
   *
   * @param {HTMLInputElement|HTMLSelectElement} element Field to write.
   * @param {string} value Value to put in it.
   */
  function write(element, value) {
    var descriptor = Object.getOwnPropertyDescriptor(Object.getPrototypeOf(element), "value");

    if (descriptor && descriptor.set) {
      descriptor.set.call(element, value);
    } else {
      element.value = value;
    }

    element.dispatchEvent(new Event("input", { bubbles: true }));
    element.dispatchEvent(new Event("change", { bubbles: true }));
  }

  /**
   * Fill the state field.
   *
   * This one field is kept away from the widget, because it needs the opposite
   * of the widget's `overwrite` rule. A street name is worth protecting — the
   * shopper may know better than the database. A state is not: the CEP decides
   * it. And WooCommerce pre-selects the store's own state on a fresh checkout,
   * which `overwrite: "auto"` would read as a choice the shopper made and
   * never touch, quietly filing a Rio address under São Paulo.
   *
   * Nothing is cleared when no option matches, and this runs only after a
   * successful lookup, so a CEP that does not exist leaves the field alone.
   *
   * Focus is put back where it was. WooCommerce runs the state field through
   * selectWoo, which takes focus for itself when the value changes, and that
   * would otherwise strand the cursor on the state box instead of the house
   * number the shopper still has to type.
   *
   * @param {string} selector CSS selector for the state field.
   * @param {string} uf Two-letter state code from the API.
   * @param {string} estado Full state name from the API.
   */
  function fillState(selector, uf, estado) {
    var element = selector ? document.querySelector(selector) : null;

    if (!element || !uf) {
      return;
    }

    var value = uf;

    if ("SELECT" === element.tagName) {
      var wanted = [uf, estado].filter(Boolean).map(fold);
      var options = Array.prototype.slice.call(element.options);
      var match = null;

      for (var i = 0; i < options.length; i += 1) {
        if (
          wanted.indexOf(fold(options[i].value)) !== -1 ||
          wanted.indexOf(fold(options[i].textContent)) !== -1
        ) {
          match = options[i].value;
          break;
        }
      }

      if (null === match) {
        return;
      }

      value = match;
    }

    if (element.value === value) {
      return;
    }

    var active = document.activeElement;

    write(element, value);

    if (active && active !== document.activeElement && "function" === typeof active.focus) {
      active.focus();
    }
  }

  /**
   * The `aria-live` region the widget announces through.
   *
   * The widget inserts it immediately after the CEP field and points the
   * field's `aria-describedby` at it, but only once, when it attaches.
   * WooCommerce re-renders the address fields afterwards — that is what
   * `country_to_state_changed` does — and the attribute does not survive it
   * while the region itself does. So the sibling is what is actually reliable
   * here, and the surrounding form row is the fallback for a theme that wraps
   * the input in something of its own.
   *
   * Never widened to a document-wide search: billing and shipping each have a
   * region, and picking the wrong one would tell a shopper about the address
   * they are not editing.
   *
   * @param {string} selector CSS selector for the CEP field.
   * @returns {HTMLElement|null}
   */
  function statusRegion(selector) {
    var field = document.querySelector(selector);

    if (!field) {
      return null;
    }

    var sibling = field.nextElementSibling;

    if (sibling && sibling.classList && sibling.classList.contains(STATUS)) {
      return sibling;
    }

    var node = field.parentElement;

    for (var depth = 0; node && depth < 2; depth += 1) {
      var region = node.querySelector("." + STATUS);

      if (region) {
        return region;
      }

      node = node.parentElement;
    }

    return null;
  }

  /**
   * Say which municipality a CEP that does not exist would have been in.
   *
   * Rewrites the line the widget just wrote, and nothing else — no field is
   * touched here, on this path, ever. The CEP was not found; there is no
   * address to fill anything with, and inventing one from the municipality
   * would send the parcel to the wrong town.
   *
   * Both guards before the write matter, because the answer arrives one round
   * trip late: the shopper may have typed on, and the widget may have replaced
   * the line with a "found" of its own in the meantime.
   *
   * @param {string} selector CSS selector for the CEP field.
   * @param {string} cep The CEP that was not found.
   */
  function explain(selector, cep) {
    var helper = window.cepisWooCommerceFaixa;
    var region = statusRegion(selector);

    if (!helper || !region) {
      return;
    }

    var shown = region.textContent;

    helper.message(cep, shown, function (message) {
      var current = statusRegion(selector);
      var field = document.querySelector(selector);
      var typed = field ? String(field.value == null ? "" : field.value).replace(/\D+/g, "") : "";

      if (message === shown || !current || current.textContent !== shown || typed !== cep) {
        return;
      }

      current.textContent = message;
    });
  }

  /**
   * Attach one address section — billing or shipping.
   *
   * @param {Record<string, string>} map Selectors, keyed by the API's field names.
   * @returns {object|null} The widget handle, or null when there is no CEP field.
   */
  function section(map) {
    if (!map || !map.cep) {
      return null;
    }

    var options = {
      baseUrl: config.baseUrl,
      overwrite: config.overwrite,
      focusNumero: !!config.focusNumero,
      debounceMs: config.debounceMs,
      timeoutMs: config.timeoutMs,
      messages: config.messages,
      onResult: function (address) {
        fillState(map.uf, address.uf, address.estado);
      },
      onError: function (error, context) {
        if (error && "not_found" === error.code) {
          explain(map.cep, context.cep);
        }
      },
    };

    Object.keys(map).forEach(function (field) {
      if ("uf" !== field) {
        options[field] = map[field];
      }
    });

    return window.CepisAutofill.attach(options);
  }

  var handles = [];

  Object.keys(config.fields).forEach(function (name) {
    var handle = section(config.fields[name]);
    if (handle) {
      handles.push(handle);
    }
  });

  window.cepisWooCommerceHandles = handles;
})();