import {IPropertyListDescriptor, PropertyDescriptorParsingType} from '../IPropertyDescriptor';
import {CSSValue, isIdentToken, isNumberToken, nonWhiteSpace} from '../syntax/parser';

export interface COUNTER_RESET {
    counter: string;
    reset: number;
}

export type CounterReset = COUNTER_RESET[];

export const counterReset: IPropertyListDescriptor<CounterReset> = {
    name: 'counter-reset',
    initialValue: 'none',
    prefix: true,
    type: PropertyDescriptorParsingType.LIST,
    parse: (tokens: CSSValue[]) => {
        if (tokens.length === 0) {
            return [];
        }

        const resets = [];
        const filtered = tokens.filter(nonWhiteSpace);

        for (let i = 0; i < filtered.length; i++) {
            const counter = filtered[i];
            const next = filtered[i + 1];
            if (isIdentToken(counter) && counter.value !== 'none') {
                const reset = next && isNumberToken(next) ? next.number : 0;
                resets.push({counter: counter.value, reset});
            }
        }

        return resets;
    }
};