import {TokenType} from '../syntax/tokenizer';
import {ICSSImage, image, isSupportedImage} from '../types/image';
import {IPropertyListDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
import {CSSValue, nonFunctionArgSeparator} from '../syntax/parser';

export const backgroundImage: IPropertyListDescriptor<ICSSImage[]> = {
    name: 'background-image',
    initialValue: 'none',
    type: PropertyDescriptorParsingType.LIST,
    prefix: false,
    parse: (tokens: CSSValue[]) => {
        if (tokens.length === 0) {
            return [];
        }

        const first = tokens[0];

        if (first.type === TokenType.IDENT_TOKEN && first.value === 'none') {
            return [];
        }

        return tokens.filter(value => nonFunctionArgSeparator(value) && isSupportedImage(value)).map(image.parse);
    }
};