import { cloneBlock } from '@wordpress/blocks';
import { useSelect, useDispatch, useRegistry } from '@wordpress/data';
import { useState, useEffect } from '@wordpress/element';
import {
	Warning,
	store as blockEditorStore,
	useBlockProps,
} from '@wordpress/block-editor';
import { store as coreStore } from '@wordpress/core-data';
import { __, sprintf } from '@wordpress/i18n';
import { useParsePatternDependencies } from './recursion-detector';

const PatternEdit = ( { attributes, clientId } ) => {
	const registry = useRegistry();
	const selectedPattern = useSelect(
		( select ) =>
			select( blockEditorStore ).__experimentalGetParsedPattern(
				attributes.slug
			),
		[ attributes.slug ]
	);

	const currentThemeStylesheet = useSelect(
		( select ) => select( coreStore ).getCurrentTheme()?.stylesheet,
		[]
	);

	const {
		replaceBlocks,
		setBlockEditingMode,
		__unstableMarkNextChangeAsNotPersistent,
	} = useDispatch( blockEditorStore );
	const { getBlockRootClientId, getBlockEditingMode } =
		useSelect( blockEditorStore );

	const [ hasRecursionError, setHasRecursionError ] = useState( false );
	const parsePatternDependencies = useParsePatternDependencies();

	// Duplicated in packages/editor/src/components/start-template-options/index.jsx.
	function injectThemeAttributeInBlockTemplateContent( block ) {
		if (
			block.innerBlocks.find(
				( innerBlock ) => innerBlock.name === 'core/template-part'
			)
		) {
			block.innerBlocks = block.innerBlocks.map( ( innerBlock ) => {
				if (
					innerBlock.name === 'core/template-part' &&
					innerBlock.attributes.theme === undefined
				) {
					innerBlock.attributes.theme = currentThemeStylesheet;
				}
				return innerBlock;
			} );
		}

		if (
			block.name === 'core/template-part' &&
			block.attributes.theme === undefined
		) {
			block.attributes.theme = currentThemeStylesheet;
		}
		return block;
	}

	// Run this effect when the component loads.
	// This adds the Pattern's contents to the post.
	// This change won't be saved.
	// It will continue to pull from the pattern file unless changes are made to its respective template part.
	useEffect( () => {
		if ( ! hasRecursionError && selectedPattern?.blocks ) {
			try {
				parsePatternDependencies( selectedPattern );
			} catch {
				setHasRecursionError( true );
				return;
			}

			// We batch updates to block list settings to avoid triggering cascading renders
			// for each container block included in a tree and optimize initial render.
			// Since the above uses microtasks, we need to use a microtask here as well,
			// because nested pattern blocks cannot be inserted if the parent block supports
			// inner blocks but doesn't have blockSettings in the state.
			window.queueMicrotask( () => {
				const rootClientId = getBlockRootClientId( clientId );
				// Clone blocks from the pattern before insertion to ensure they receive
				// distinct client ids. See https://github.com/WordPress/gutenberg/issues/50628.
				const clonedBlocks = selectedPattern.blocks.map( ( block ) =>
					cloneBlock(
						injectThemeAttributeInBlockTemplateContent( block )
					)
				);
				// If the pattern has a single block and categories, we should add the
				// categories of the pattern to the block's metadata.
				if (
					clonedBlocks.length === 1 &&
					selectedPattern.categories?.length > 0
				) {
					clonedBlocks[ 0 ].attributes = {
						...clonedBlocks[ 0 ].attributes,
						metadata: {
							...clonedBlocks[ 0 ].attributes.metadata,
							categories: selectedPattern.categories,
							patternName: selectedPattern.name,
							name:
								clonedBlocks[ 0 ].attributes.metadata.name ||
								selectedPattern.title,
						},
					};
				}
				const rootEditingMode = getBlockEditingMode( rootClientId );
				registry.batch( () => {
					// Temporarily set the root block to default mode to allow replacing the pattern.
					// This could happen when the page is disabling edits of non-content blocks.
					__unstableMarkNextChangeAsNotPersistent();
					setBlockEditingMode( rootClientId, 'default' );
					__unstableMarkNextChangeAsNotPersistent();
					replaceBlocks( clientId, clonedBlocks );
					// Restore the root block's original mode.
					__unstableMarkNextChangeAsNotPersistent();
					setBlockEditingMode( rootClientId, rootEditingMode );
				} );
			} );
		}
	}, [
		clientId,
		hasRecursionError,
		selectedPattern,
		__unstableMarkNextChangeAsNotPersistent,
		replaceBlocks,
		getBlockEditingMode,
		setBlockEditingMode,
		getBlockRootClientId,
	] );

	const props = useBlockProps();

	if ( hasRecursionError ) {
		return (
			<div { ...props }>
				<Warning>
					{ sprintf(
						// translators: A warning in which %s is the name of a pattern.
						__( 'Pattern "%s" cannot be rendered inside itself.' ),
						selectedPattern?.name
					) }
				</Warning>
			</div>
		);
	}

	return <div { ...props } />;
};

export default PatternEdit;