import * as url from '../../utils/url.js';
import * as string from '../../utils/string.js';
import {
  Function as FunctionToken,
  String as StringToken,
  Url,
  RightParenthesis,
} from '../../tokenizer/index.js';

export const name = 'Url';
export const structure = {
  value: String,
};

// <url-token> | <function-token> <string> )
export function parse() {
  const start = this.tokenStart;
  let value;

  switch (this.tokenType) {
    case Url:
      value = url.decode(this.consume(Url));
      break;

    case FunctionToken:
      if (!this.cmpStr(this.tokenStart, this.tokenEnd, 'url(')) {
        this.error('Function name must be `url`');
      }

      this.eat(FunctionToken);
      this.skipSC();
      value = string.decode(this.consume(StringToken));
      this.skipSC();
      if (!this.eof) {
        this.eat(RightParenthesis);
      }
      break;

    default:
      this.error('Url or Function is expected');
  }

  return {
    type: 'Url',
    loc: this.getLocation(start, this.tokenStart),
    value,
  };
}

export function generate(node) {
  this.token(Url, url.encode(node.value));
}