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

export const backgroundImage: IPropertyListDescriptor<ICSSImage[]> = {
    name: 'background-image',
    initialValue: 'none',
    type: PropertyDescriptorParsingType.LIST,
    prefix: false,
    parse: (context: Context, 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((value) => image.parse(context, value));
    }
};