import { Scalar } from '../../nodes/Scalar.mjs';
import { stringifyNumber } from '../../stringify/stringifyNumber.mjs';

const floatNaN = {
  identify: value => typeof value === 'number',
  default: true,
  tag: 'tag:yaml.org,2002:float',
  test: /^(?:[-+]?\.(?:inf|Inf|INF)|\.nan|\.NaN|\.NAN)$/,
  resolve: str => str.slice(-3).toLowerCase() === 'nan' ? NaN : str[0] === '-' ? Number.NEGATIVE_INFINITY : Number.POSITIVE_INFINITY,
  stringify: stringifyNumber
};
const floatExp = {
  identify: value => typeof value === 'number',
  default: true,
  tag: 'tag:yaml.org,2002:float',
  format: 'EXP',
  test: /^[-+]?(?:[0-9][0-9_]*)?(?:\.[0-9_]*)?[eE][-+]?[0-9]+$/,
  resolve: str => parseFloat(str.replace(/_/g, '')),
  stringify(node) {
    const num = Number(node.value);
    return isFinite(num) ? num.toExponential() : stringifyNumber(node);
  }
};
const float = {
  identify: value => typeof value === 'number',
  default: true,
  tag: 'tag:yaml.org,2002:float',
  test: /^[-+]?(?:[0-9][0-9_]*)?\.[0-9_]*$/,
  resolve(str) {
    const node = new Scalar(parseFloat(str.replace(/_/g, '')));
    const dot = str.indexOf('.');
    if (dot !== -1) {
      const f = str.substring(dot + 1).replace(/_/g, '');
      if (f[f.length - 1] === '0') node.minFractionDigits = f.length;
    }
    return node;
  },
  stringify: stringifyNumber
};

export { float, floatExp, floatNaN };
