/**
   * @fileoverview Prevent multiple component definition per file
   * @author Yannick Croissant
   */
  'use strict';
  
  var Components = require('../util/Components');
  
  // ------------------------------------------------------------------------------
  // Rule Definition
  // ------------------------------------------------------------------------------
  
  module.exports = Components.detect(function(context, components) {
  
    var configuration = context.options[0] || {};
    var ignoreStateless = configuration.ignoreStateless || false;
  
    var MULTI_COMP_MESSAGE = 'Declare only one React component per file';
  
    /**
     * Checks if the component is ignored
     * @param {Object} component The component being checked.
     * @returns {Boolean} True if the component is ignored, false if not.
     */
    function isIgnored(component) {
      return ignoreStateless === true && /Function/.test(component.node.type);
    }
  
    // --------------------------------------------------------------------------
    // Public
    // --------------------------------------------------------------------------
  
    return {
      'Program:exit': function() {
        if (components.length() <= 1) {
          return;
        }
  
        var list = components.list();
        var i = 0;
  
        for (var component in list) {
          if (!list.hasOwnProperty(component) || isIgnored(list[component]) || ++i === 1) {
            continue;
          }
          context.report(list[component].node, MULTI_COMP_MESSAGE);
        }
      }
    };
  });
  
  module.exports.schema = [{
    type: 'object',
    properties: {
      ignoreStateless: {
        default: false,
        type: 'boolean'
      }
    },
    additionalProperties: false
  }];