/**
 * @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
}];