import clsx from 'clsx';
import {
	getColorClassName,
	RichText,
	useBlockProps,
} from '@wordpress/block-editor';
import migrateTextAlignAttributeToBlockSupport from '../utils/migrate-text-align';

const blockSupports = {
	className: false,
	anchor: true,
};

const blockAttributes = {
	align: {
		type: 'string',
	},
	content: {
		type: 'string',
		source: 'html',
		selector: 'h1,h2,h3,h4,h5,h6',
		default: '',
	},
	level: {
		type: 'number',
		default: 2,
	},
	placeholder: {
		type: 'string',
	},
};

const migrateCustomColors = ( attributes ) => {
	if ( ! attributes.customTextColor ) {
		return attributes;
	}
	const style = {
		color: {
			text: attributes.customTextColor,
		},
	};

	const { customTextColor, ...restAttributes } = attributes;

	return {
		...restAttributes,
		style,
	};
};

const TEXT_ALIGN_OPTIONS = [ 'left', 'right', 'center' ];

const migrateTextAlign = ( attributes ) => {
	const { align, ...rest } = attributes;
	return TEXT_ALIGN_OPTIONS.includes( align )
		? { ...rest, textAlign: align }
		: attributes;
};

const v1 = {
	supports: blockSupports,
	attributes: {
		...blockAttributes,
		customTextColor: {
			type: 'string',
		},
		textColor: {
			type: 'string',
		},
	},
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
	save( { attributes } ) {
		const { align, level, content, textColor, customTextColor } =
			attributes;
		const tagName = 'h' + level;

		const textClass = getColorClassName( 'color', textColor );

		const className = clsx( {
			[ textClass ]: textClass,
		} );

		return (
			<RichText.Content
				className={ className ? className : undefined }
				tagName={ tagName }
				style={ {
					textAlign: align,
					color: textClass ? undefined : customTextColor,
				} }
				value={ content }
			/>
		);
	},
};
const v2 = {
	attributes: {
		...blockAttributes,
		customTextColor: {
			type: 'string',
		},
		textColor: {
			type: 'string',
		},
	},
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
	save( { attributes } ) {
		const { align, content, customTextColor, level, textColor } =
			attributes;
		const tagName = 'h' + level;

		const textClass = getColorClassName( 'color', textColor );

		const className = clsx( {
			[ textClass ]: textClass,
			[ `has-text-align-${ align }` ]: align,
		} );

		return (
			<RichText.Content
				className={ className ? className : undefined }
				tagName={ tagName }
				style={ {
					color: textClass ? undefined : customTextColor,
				} }
				value={ content }
			/>
		);
	},
	supports: blockSupports,
};
const v3 = {
	supports: blockSupports,
	attributes: {
		...blockAttributes,
		customTextColor: {
			type: 'string',
		},
		textColor: {
			type: 'string',
		},
	},
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
	save( { attributes } ) {
		const { align, content, customTextColor, level, textColor } =
			attributes;
		const tagName = 'h' + level;

		const textClass = getColorClassName( 'color', textColor );

		const className = clsx( {
			[ textClass ]: textClass,
			'has-text-color': textColor || customTextColor,
			[ `has-text-align-${ align }` ]: align,
		} );

		return (
			<RichText.Content
				className={ className ? className : undefined }
				tagName={ tagName }
				style={ {
					color: textClass ? undefined : customTextColor,
				} }
				value={ content }
			/>
		);
	},
};
const v4 = {
	supports: {
		align: [ 'wide', 'full' ],
		anchor: true,
		className: false,
		color: { link: true },
		fontSize: true,
		lineHeight: true,
		__experimentalSelector: {
			'core/heading/h1': 'h1',
			'core/heading/h2': 'h2',
			'core/heading/h3': 'h3',
			'core/heading/h4': 'h4',
			'core/heading/h5': 'h5',
			'core/heading/h6': 'h6',
		},
		__unstablePasteTextInline: true,
	},
	attributes: blockAttributes,
	isEligible: ( { align } ) => TEXT_ALIGN_OPTIONS.includes( align ),
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
	save( { attributes } ) {
		const { align, content, level } = attributes;
		const TagName = 'h' + level;

		const className = clsx( {
			[ `has-text-align-${ align }` ]: align,
		} );

		return (
			<TagName { ...useBlockProps.save( { className } ) }>
				<RichText.Content value={ content } />
			</TagName>
		);
	},
};

// This deprecation covers the serialization of the `wp-block-heading` class
// into the block's markup after className support was enabled.
const v5 = {
	supports: {
		align: [ 'wide', 'full' ],
		anchor: true,
		className: false,
		color: {
			gradients: true,
			link: true,
			__experimentalDefaultControls: {
				background: true,
				text: true,
			},
		},
		spacing: {
			margin: true,
			padding: true,
		},
		typography: {
			fontSize: true,
			lineHeight: true,
			__experimentalFontFamily: true,
			__experimentalFontStyle: true,
			__experimentalFontWeight: true,
			__experimentalLetterSpacing: true,
			__experimentalTextTransform: true,
			__experimentalTextDecoration: true,
			__experimentalDefaultControls: {
				fontSize: true,
				fontAppearance: true,
				textTransform: true,
			},
		},
		__experimentalSelector: 'h1,h2,h3,h4,h5,h6',
		__unstablePasteTextInline: true,
		__experimentalSlashInserter: true,
	},
	attributes: {
		textAlign: {
			type: 'string',
		},
		content: {
			type: 'string',
			source: 'html',
			selector: 'h1,h2,h3,h4,h5,h6',
			default: '',
			role: 'content',
		},
		level: {
			type: 'number',
			default: 2,
		},
		placeholder: {
			type: 'string',
		},
	},
	save( { attributes } ) {
		const { textAlign, content, level } = attributes;
		const TagName = 'h' + level;

		const className = clsx( {
			[ `has-text-align-${ textAlign }` ]: textAlign,
		} );

		return (
			<TagName { ...useBlockProps.save( { className } ) }>
				<RichText.Content value={ content } />
			</TagName>
		);
	},
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
};

const v6 = {
	supports: {
		align: [ 'wide', 'full' ],
		anchor: true,
		className: true,
		splitting: true,
		__experimentalBorder: {
			color: true,
			radius: true,
			style: true,
			width: true,
		},
		color: {
			gradients: true,
			link: true,
			__experimentalDefaultControls: {
				background: true,
				text: true,
			},
		},
		spacing: {
			margin: true,
			padding: true,
		},
		typography: {
			fontSize: true,
			lineHeight: true,
			__experimentalFontFamily: true,
			__experimentalFontStyle: true,
			__experimentalFontWeight: true,
			__experimentalLetterSpacing: true,
			__experimentalTextTransform: true,
			__experimentalTextDecoration: true,
			__experimentalWritingMode: true,
			fitText: true,
			__experimentalDefaultControls: {
				fontSize: true,
			},
		},
		__unstablePasteTextInline: true,
		__experimentalSlashInserter: true,
		interactivity: {
			clientNavigation: true,
		},
	},
	attributes: {
		textAlign: {
			type: 'string',
		},
		content: {
			type: 'string',
			source: 'html',
			selector: 'h1,h2,h3,h4,h5,h6',
			default: '',
			role: 'content',
		},
		level: {
			type: 'number',
			default: 2,
		},
		levelOptions: {
			type: 'array',
		},
		placeholder: {
			type: 'string',
		},
	},
	save( { attributes } ) {
		const { textAlign, content, level } = attributes;
		const TagName = 'h' + level;

		const className = clsx( {
			[ `has-text-align-${ textAlign }` ]: textAlign,
		} );

		return (
			<TagName { ...useBlockProps.save( { className } ) }>
				<RichText.Content value={ content } />
			</TagName>
		);
	},
	migrate: ( attributes ) =>
		migrateTextAlignAttributeToBlockSupport(
			migrateCustomColors( migrateTextAlign( attributes ) )
		),
	isEligible( attributes ) {
		return (
			!! attributes.textAlign ||
			!! attributes.className?.match(
				/\bhas-text-align-(left|center|right)\b/
			)
		);
	},
};

const deprecated = [ v6, v5, v4, v3, v2, v1 ];

export default deprecated;