/**
 * External dependencies
 */
import { colord } from 'colord';
import memoize from 'memize';

/**
 * WordPress dependencies
 */
import { useCallback } from '@wordpress/element';

/**
 * Internal dependencies
 */
import type { ColorPickerProps, LegacyColor, LegacyProps } from './types';

function isLegacyProps( props: any ): props is LegacyProps {
	return (
		typeof props.onChangeComplete !== 'undefined' ||
		typeof props.disableAlpha !== 'undefined' ||
		typeof props.color?.hex === 'string'
	);
}

function getColorFromLegacyProps(
	color: LegacyProps[ 'color' ]
): string | undefined {
	if ( color === undefined ) {
		return;
	}

	if ( typeof color === 'string' ) {
		return color;
	}

	if ( color.hex ) {
		return color.hex;
	}

	return undefined;
}

const transformColorStringToLegacyColor = memoize(
	( color: string ): LegacyColor => {
		const colordColor = colord( color );
		const hex = colordColor.toHex();
		const rgb = colordColor.toRgb();
		const hsv = colordColor.toHsv();
		const hsl = colordColor.toHsl();

		return {
			hex,
			rgb,
			hsv,
			hsl,
			source: 'hex',
			oldHue: hsl.h,
		};
	}
);

export function useDeprecatedProps(
	props: LegacyProps | ColorPickerProps
): ColorPickerProps {
	const { onChangeComplete } = props as LegacyProps;
	const legacyChangeHandler = useCallback(
		( color: string ) => {
			onChangeComplete( transformColorStringToLegacyColor( color ) );
		},
		[ onChangeComplete ]
	);
	if ( isLegacyProps( props ) ) {
		return {
			color: getColorFromLegacyProps( props.color ),
			enableAlpha: ! props.disableAlpha,
			onChange: legacyChangeHandler,
		};
	}
	return {
		...props,
		color: props.color as ColorPickerProps[ 'color' ],
		enableAlpha: ( props as ColorPickerProps ).enableAlpha,
		onChange: ( props as ColorPickerProps ).onChange,
	};
}