'use strict';

var parseSelector = require('./lib/selector'),
    matchSelector = require('./lib/select');

var debug = require('debug')('unist-util-select');


var select = function select (ast, selector) {
  if (arguments.length == 1) {
    return select.bind(this, ast);
  }

  debug('Selector: %j', selector);
  selector = parseSelector(selector);
  debug('AST: %s',
        JSON.stringify(selector, null, 2).replace(/(^|\n)/g, '\n    '));
  return selector ? matchSelector[selector.type](selector, ast) : [];
};


select.one = function selectOne (ast, selector) {
  if (arguments.length == 1) {
    return selectOne.bind(this, ast);
  }

  var nodes = select(ast, selector);

  if (!nodes.length) {
    throw Error('Node not found by ' + JSON.stringify(selector));
  }
  if (nodes.length > 1) {
    throw Error('Node matched by ' + JSON.stringify(selector) + ' is not unique');
  }

  return nodes[0];
};


module.exports = select;