import { createContext, useContext } from "solid-js";

/**
 * Context published by `<OTPField.Root>` to its descendant slot `<Input>`s.
 *
 * Solid 2 adaptation from Base UI React's `OTPFieldRootContext`:
 *
 * - Every reactive entry is exposed as `Accessor<T>` so descendants pull live
 *   values on demand without tripping the top-level reactive-read rule
 *   (RFC 01). The React version ships snapshots; here we ship getters.
 * - Callbacks (`setValue`, `focusInput`, `queueFocusInput`, `handleInputBlur`,
 *   `handleInputFocus`, `reportValueInvalid`, `getInputId`) are plain stable
 *   functions owned by the root — slot inputs capture them into event
 *   closures.
 * - `state` is an accessor returning the full `OTPFieldRootState` object so
 *   each slot can derive its own `OTPFieldInputState` via the helper below.
 */

const NOOP = () => {};
export const NOOP_OTP_FIELD_ROOT_CONTEXT = {
  activeIndex: () => 0,
  autoComplete: () => undefined,
  disabled: () => false,
  form: () => undefined,
  focusInput: NOOP,
  queueFocusInput: NOOP,
  getInputId: () => undefined,
  handleInputBlur: NOOP,
  handleInputFocus: NOOP,
  inputMode: () => undefined,
  inputAriaLabelledBy: () => undefined,
  invalid: () => false,
  length: () => 0,
  mask: () => false,
  pattern: () => undefined,
  reportValueInvalid: NOOP,
  readOnly: () => false,
  required: () => false,
  sanitizeValue: () => undefined,
  setValue: () => null,
  state: () => ({
    disabled: false,
    valid: null,
    touched: false,
    dirty: false,
    filled: false,
    focused: false,
    complete: false,
    length: 0,
    readOnly: false,
    required: false,
    value: ""
  }),
  validationType: () => "numeric",
  value: () => "",
  present: false
};
export const OTPFieldRootContext = createContext(NOOP_OTP_FIELD_ROOT_CONTEXT);

/**
 * Read the nearest `<OTPField.Root>` context. Throws when no real root is an
 * ancestor — slot `<Input>`s are meaningless without their root.
 */
export function useOTPFieldRootContext() {
  const context = useContext(OTPFieldRootContext);
  if (!context.present) {
    throw new Error("Base UI: OTPFieldRootContext is missing. OTPField parts must be placed within <OTPField.Root>.");
  }
  return context;
}

/**
 * Derive per-slot state from the root state + this slot's value and index.
 * Pure helper — call it from a memo if you want reactive updates.
 */
export function getOTPFieldInputState(state, value, index) {
  return {
    ...state,
    value,
    index,
    filled: value !== ""
  };
}
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