/**
 * @fileoverview Prevent usage of dangerous JSX props
 * @author Scott Andrews
 */
'use strict';

// ------------------------------------------------------------------------------
// Constants
// ------------------------------------------------------------------------------

var DANGEROUS_MESSAGE = 'Dangerous property \'{{name}}\' found';

var DANGEROUS_PROPERTY_NAMES = [
  'dangerouslySetInnerHTML'
];

var DANGEROUS_PROPERTIES = DANGEROUS_PROPERTY_NAMES.reduce(function (props, prop) {
  props[prop] = prop;
  return props;
}, Object.create(null));

// ------------------------------------------------------------------------------
// Helpers
// ------------------------------------------------------------------------------

/**
 * Checks if a node name match the JSX tag convention.
 * @param {String} name - Name of the node to check.
 * @returns {boolean} Whether or not the node name match the JSX tag convention.
 */
var tagConvention = /^[a-z]|\-/;
function isTagName(name) {
  return tagConvention.test(name);
}

/**
 * Checks if a JSX attribute is dangerous.
 * @param {String} name - Name of the attribute to check.
 * @returns {boolean} Whether or not the attribute is dnagerous.
 */
function isDangerous(name) {
  return name in DANGEROUS_PROPERTIES;
}

// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------

module.exports = function(context) {

  return {

    JSXAttribute: function(node) {
      if (isTagName(node.parent.name.name) && isDangerous(node.name.name)) {
        context.report(node, DANGEROUS_MESSAGE, {
          name: node.name.name
        });
      }
    }

  };

};

module.exports.schema = [];