// Shared constants extracted from intl-tel-input logic to avoid magic strings/numbers

import type { Iso2 } from "./data.js";

export const EVENTS = {
  OPEN_COUNTRY_SELECTOR: "open:countryselector",
  CLOSE_COUNTRY_SELECTOR: "close:countryselector",
  COUNTRY_CHANGE: "countrychange",
  INPUT: "input", // used for synthetic input trigger
  STRICT_REJECT: "strict:reject",
} as const;

//* The named "slots" (i.e. the elements we generate) that consumers can add their own classes
//* to, via the classNames option. Deliberately decoupled from our internal iti__* class names,
//* so the markup remains an implementation detail. Used to validate the option at runtime, and
//* to derive the ItiClassNames type. Keep in sync with the ItiClassNames interface.
export const ITI_SLOTS = [
  "container",
  "input",
  "countryContainer",
  "selectedCountry",
  "selectedCountryPrimary",
  "selectedFlag",
  "arrow",
  "selectedDialCode",
  "countrySelector",
  "countrySelectorContainer",
  "searchWrapper",
  "searchIcon",
  "searchInput",
  "searchClear",
  "countryList",
  "countryListItem",
  "countryListItemFlag",
  "countryName",
  "dialCode",
  "countryCheck",
  "noResults",
] as const;

export const CLASSES = {
  HIDE: "iti__hide",
  V_HIDE: "iti__v-hide",
  ARROW_UP: "iti__arrow--up",
  GLOBE: "iti__globe",
  FLAG: "iti__flag",
  LOADING: "iti__loading",
  COUNTRY_ITEM: "iti__country",
  HIGHLIGHT: "iti__highlight",
  STRICT_REJECT_ANIMATION: "iti__strict-reject-animation",
} as const;

export const KEYS = {
  ARROW_UP: "ArrowUp",
  ARROW_DOWN: "ArrowDown",
  SPACE: " ",
  ENTER: "Enter",
  ESC: "Escape",
  TAB: "Tab",
} as const;

export const INPUT_TYPES = {
  PASTE: "insertFromPaste",
  DELETE_FORWARD: "deleteContentForward",
} as const;

export const REGEX = {
  ALPHA_UNICODE: /\p{L}/u, // any kind of letter from any language
  NON_PLUS_NUMERIC: /[^+0-9]/, // chars that are NOT + or digit
  NON_PLUS_NUMERIC_GLOBAL: /[^+0-9]/g, // chars that are NOT + or digit (global)
  HIDDEN_SEARCH_CHAR: /^[a-zA-ZÀ-ÿа-яА-Я ]$/, // single acceptable hidden-search char
} as const;

export const TIMINGS = {
  SEARCH_DEBOUNCE_MS: 100,
  HIDDEN_SEARCH_RESET_MS: 1000,
  NEXT_TICK: 0,
} as const;

// Layout / sizing fallbacks (used when measuring elements fails e.g., hidden containers)
// TODO: find a way to pull these out of the CSS, so there's a single source of truth.
export const LAYOUT = {
  NARROW_VIEWPORT_WIDTH: 500, // keep in sync with .iti__country-list CSS media query
  FALLBACK_SELECTED_COUNTRY_WITH_DIAL_WIDTH: 78, // px width fallback when separateDialCode enabled
  FALLBACK_SELECTED_COUNTRY_NO_DIAL_WIDTH: 42, // px width fallback when no separate dial code
  INPUT_PADDING_EXTRA_LEFT: 6, // px gap between selected country container and input text
  DROPDOWN_MARGIN: 3, // px margin between dropdown and tel input
  FALLBACK_DROPDOWN_HEIGHT: 200, // px height fallback for dropdown
} as const;

// Helpful grouping for dial code logic (kept lean; expand only if reused widely)
export const DIAL_CODE = {
  PLUS: "+",
  NANP: "1", // North American Numbering Plan
} as const;

// E.164 caps a full international number (dial code + national number) at 15
// digits. Used as a fallback max length in strictMode when there is no selected
// country, and so no country-specific max to enforce.
export const E164_MAX_DIGITS = 15;

// Country-specific telephone rules
export const UK = {
  ISO2: "gb" as Iso2,
  DIAL_CODE: "44", // +44 United Kingdom
  MOBILE_PREFIX: "7", // UK mobile numbers start with 7 after national trunk (0) or core section
  MOBILE_CORE_LENGTH: 10, // core number length (excluding dial code / national prefix) for mobiles
} as const;

export const US = {
  ISO2: "us" as Iso2,
  DIAL_CODE: "1", // +1 United States
};

// Public-facing enum constant for placeholderNumberPolicy. Singular to match
// NUMBER_FORMAT / NUMBER_TYPE / VALIDATION_ERROR. Hand-defined (rather than
// derived via toEnumObject) because there's no parallel array to be the source
// of truth.
export const PLACEHOLDER_POLICY = {
  AGGRESSIVE: "AGGRESSIVE",
  POLITE: "POLITE",
  OFF: "OFF",
} as const;

// Valid values for the countrySelectorMode option. The COUNTRY_SELECTOR_MODE
// enum object is derived from this array (below, alongside NUMBER_FORMAT etc).
export const COUNTRY_SELECTOR_MODES = [
  "OFF",
  "DROPDOWN",
  "FULLSCREEN",
  "AUTO",
] as const;

// libphonenumber enums - sole source of truth for both the core library (option
// validation, public types) and utils.js (which builds its int maps from
// these arrays at build time via scripts/build-utils.js).
//
// Order matters - the array index is the integer value libphonenumber uses,
// EXCEPT for NUMBER_TYPES.UNKNOWN which libphonenumber maps to -1 (handled
// explicitly in utils.js).
//
// Mirrors:
//   - i18n.phonenumbers.PhoneNumberFormat
//   - i18n.phonenumbers.PhoneNumberType
//   - i18n.phonenumbers.PhoneNumberUtil.ValidationResult
// in third_party/libphonenumber/javascript/i18n/phonenumbers/phonenumberutil.js
export const NUMBER_FORMATS = [
  "E164",
  "INTERNATIONAL",
  "NATIONAL",
  "RFC3966",
] as const;

export const NUMBER_TYPES = [
  "FIXED_LINE",
  "MOBILE",
  "FIXED_LINE_OR_MOBILE",
  "TOLL_FREE",
  "PREMIUM_RATE",
  "SHARED_COST",
  "VOIP",
  "PERSONAL_NUMBER",
  "PAGER",
  "UAN",
  "VOICEMAIL",
  "UNKNOWN",
] as const;

export const VALIDATION_ERRORS = [
  "IS_POSSIBLE",
  "INVALID_COUNTRY_CODE",
  "TOO_SHORT",
  "TOO_LONG",
  "IS_POSSIBLE_LOCAL_ONLY",
  "INVALID_LENGTH",
] as const;

// Convenience constants so consumers can write NUMBER_TYPE.MOBILE instead of
// the bare string "MOBILE" - typo-safe and matches the PLACEHOLDER_POLICY style.
// Derived from the arrays above so there's no second list to keep in sync.
const toEnumObject = <T extends readonly string[]>(
  arr: T,
): Readonly<{ [K in T[number]]: K }> =>
  Object.fromEntries(arr.map((v) => [v, v])) as Readonly<{
    [K in T[number]]: K;
  }>;

export const NUMBER_FORMAT = toEnumObject(NUMBER_FORMATS);
export const NUMBER_TYPE = toEnumObject(NUMBER_TYPES);
export const VALIDATION_ERROR = toEnumObject(VALIDATION_ERRORS);
export const COUNTRY_SELECTOR_MODE = toEnumObject(COUNTRY_SELECTOR_MODES);

// Data-* keys used on DOM nodes
export const DATA_KEYS = {
  // e.g. <li data-iso2="us"> for country items in the country list
  ISO2: "iso2",
  DIAL_CODE: "dialCode",
  // e.g. <input data-intl-tel-input-id="0"> on the input element
  INSTANCE_ID: "intlTelInputId",
} as const;

// ARIA attribute names (avoid typos & for potential future refactors)
export const ARIA = {
  EXPANDED: "aria-expanded",
  LABEL: "aria-label",
  SELECTED: "aria-selected",
  ACTIVE_DESCENDANT: "aria-activedescendant",
  HASPOPUP: "aria-haspopup",
  CONTROLS: "aria-controls",
  HIDDEN: "aria-hidden",
  AUTOCOMPLETE: "aria-autocomplete",
  MODAL: "aria-modal",
} as const;