/**
 * External dependencies
 */
import classnames from 'classnames';
import { isString, isObject } from '@woocommerce/types';
import type { Style as StyleEngineProperties } from '@wordpress/style-engine/src/types';
import type { CSSProperties } from 'react';

/**
 * Internal dependencies
 */
import { useTypographyProps } from './use-typography-props';
import {
	getColorClassesAndStyles,
	getBorderClassesAndStyles,
	getSpacingClassesAndStyles,
} from '../utils';

export type StyleProps = {
	className: string;
	style: CSSProperties;
};

type BlockAttributes = Record< string, unknown > & {
	style?: StyleEngineProperties | string | undefined;
};

type StyleAttributes = Record< string, unknown > & {
	style: StyleEngineProperties;
};

/**
 * Parses incoming props.
 *
 * This may include style properties at the top level, or may include a nested `style` object. This ensures the expected
 * values are present and converts any string based values to objects as required.
 */
const parseStyleAttributes = ( rawProps: BlockAttributes ): StyleAttributes => {
	const props = isObject( rawProps )
		? rawProps
		: {
				style: {},
		  };

	let style = props.style;

	if ( isString( style ) ) {
		style = JSON.parse( style ) || {};
	}

	if ( ! isObject( style ) ) {
		style = {};
	}

	return {
		...props,
		style,
	};
};

/**
 * Returns the CSS class names and inline styles for a block when provided with its props/attributes.
 *
 * This hook (and its utilities) borrow functionality from the Gutenberg Block Editor package--something we don't want
 * to import on the frontend.
 */
export const useStyleProps = ( props: BlockAttributes ): StyleProps => {
	const styleAttributes = parseStyleAttributes( props );
	const colorProps = getColorClassesAndStyles( styleAttributes );
	const borderProps = getBorderClassesAndStyles( styleAttributes );
	const spacingProps = getSpacingClassesAndStyles( styleAttributes );
	const typographyProps = useTypographyProps( styleAttributes );

	return {
		className: classnames(
			typographyProps.className,
			colorProps.className,
			borderProps.className,
			spacingProps.className
		),
		style: {
			...typographyProps.style,
			...colorProps.style,
			...borderProps.style,
			...spacingProps.style,
		},
	};
};