/**
 * External dependencies
 */
import clsx from 'clsx';

/**
 * WordPress dependencies
 */
import { useContext } from '@wordpress/element';
import { __, sprintf } from '@wordpress/i18n';
import { __unstableGetBlockProps as getBlockProps } from '@wordpress/blocks';
import { useMergeRefs, useDisabled } from '@wordpress/compose';
import warning from '@wordpress/warning';

/**
 * Internal dependencies
 */
import useMovingAnimation from '../../use-moving-animation';
import { PrivateBlockContext } from '../private-block-context';
import { useFocusFirstElement } from './use-focus-first-element';
import { useIsHovered } from './use-is-hovered';
import { blockBindingsKey, useBlockEditContext } from '../../block-edit/context';
import { useFocusHandler } from './use-focus-handler';
import { useEventHandlers } from './use-selected-block-event-handlers';
import { useBlockRefProvider } from './use-block-refs';
import { useIntersectionObserver } from './use-intersection-observer';
import { useScrollIntoView } from './use-scroll-into-view';
import { useFlashEditableBlocks } from '../../use-flash-editable-blocks';
import { canBindBlock } from '../../../hooks/use-bindings-attributes';

/**
 * This hook is used to lightly mark an element as a block element. The element
 * should be the outermost element of a block. Call this hook and pass the
 * returned props to the element to mark as a block. If you define a ref for the
 * element, it is important to pass the ref to this hook, which the hook in turn
 * will pass to the component through the props it returns. Optionally, you can
 * also pass any other props through this hook, and they will be merged and
 * returned.
 *
 * Use of this hook on the outermost element of a block is required if using API >= v2.
 *
 * @example
 * ```js
 * import { useBlockProps } from '@wordpress/block-editor';
 *
 * export default function Edit() {
 *
 *   const blockProps = useBlockProps( {
 *     className: 'my-custom-class',
 *     style: {
 *       color: '#222222',
 *       backgroundColor: '#eeeeee'
 *     }
 *   } )
 *
 *   return (
 *	    <div { ...blockProps }>
 *
 *     </div>
 *   )
 * }
 *
 * ```
 *
 *
 * @param {Object}  props                    Optional. Props to pass to the element. Must contain
 *                                           the ref if one is defined.
 * @param {Object}  options                  Options for internal use only.
 * @param {boolean} options.__unstableIsHtml
 *
 * @return {Object} Props to pass to the element to mark as a block.
 */
export function useBlockProps(props = {}, {
  __unstableIsHtml
} = {}) {
  const {
    clientId,
    className,
    wrapperProps = {},
    isAligned,
    index,
    mode,
    name,
    blockApiVersion,
    blockTitle,
    isSelected,
    isSubtreeDisabled,
    hasOverlay,
    initialPosition,
    blockEditingMode,
    isHighlighted,
    isMultiSelected,
    isPartiallySelected,
    isReusable,
    isDragging,
    hasChildSelected,
    isEditingDisabled,
    hasEditableOutline,
    isTemporarilyEditingAsBlocks,
    defaultClassName,
    isSectionBlock
  } = useContext(PrivateBlockContext);

  // translators: %s: Type of block (i.e. Text, Image etc)
  const blockLabel = sprintf(__('Block: %s'), blockTitle);
  const htmlSuffix = mode === 'html' && !__unstableIsHtml ? '-visual' : '';
  const mergedRefs = useMergeRefs([props.ref, useFocusFirstElement({
    clientId,
    initialPosition
  }), useBlockRefProvider(clientId), useFocusHandler(clientId), useEventHandlers({
    clientId,
    isSelected
  }), useIsHovered({
    clientId
  }), useIntersectionObserver(), useMovingAnimation({
    triggerAnimationOnChange: index,
    clientId
  }), useDisabled({
    isDisabled: !hasOverlay
  }), useFlashEditableBlocks({
    clientId,
    isEnabled: isSectionBlock
  }), useScrollIntoView({
    isSelected
  })]);
  const blockEditContext = useBlockEditContext();
  const hasBlockBindings = !!blockEditContext[blockBindingsKey];
  const bindingsStyle = hasBlockBindings && canBindBlock(name) ? {
    '--wp-admin-theme-color': 'var(--wp-block-synced-color)',
    '--wp-admin-theme-color--rgb': 'var(--wp-block-synced-color--rgb)'
  } : {};

  // Ensures it warns only inside the `edit` implementation for the block.
  if (blockApiVersion < 2 && clientId === blockEditContext.clientId) {
    globalThis.SCRIPT_DEBUG === true ? warning(`Block type "${name}" must support API version 2 or higher to work correctly with "useBlockProps" method.`) : void 0;
  }
  let hasNegativeMargin = false;
  if (wrapperProps?.style?.marginTop?.charAt(0) === '-' || wrapperProps?.style?.marginBottom?.charAt(0) === '-' || wrapperProps?.style?.marginLeft?.charAt(0) === '-' || wrapperProps?.style?.marginRight?.charAt(0) === '-') {
    hasNegativeMargin = true;
  }
  return {
    tabIndex: blockEditingMode === 'disabled' ? -1 : 0,
    ...wrapperProps,
    ...props,
    ref: mergedRefs,
    id: `block-${clientId}${htmlSuffix}`,
    role: 'document',
    'aria-label': blockLabel,
    'data-block': clientId,
    'data-type': name,
    'data-title': blockTitle,
    inert: isSubtreeDisabled ? 'true' : undefined,
    className: clsx('block-editor-block-list__block', {
      // The wp-block className is important for editor styles.
      'wp-block': !isAligned,
      'has-block-overlay': hasOverlay,
      'is-selected': isSelected,
      'is-highlighted': isHighlighted,
      'is-multi-selected': isMultiSelected,
      'is-partially-selected': isPartiallySelected,
      'is-reusable': isReusable,
      'is-dragging': isDragging,
      'has-child-selected': hasChildSelected,
      'is-editing-disabled': isEditingDisabled,
      'has-editable-outline': hasEditableOutline,
      'has-negative-margin': hasNegativeMargin,
      'is-content-locked-temporarily-editing-as-blocks': isTemporarilyEditingAsBlocks
    }, className, props.className, wrapperProps.className, defaultClassName),
    style: {
      ...wrapperProps.style,
      ...props.style,
      ...bindingsStyle
    }
  };
}

/**
 * Call within a save function to get the props for the block wrapper.
 *
 * @param {Object} props Optional. Props to pass to the element.
 */
useBlockProps.save = getBlockProps;
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