/**
 * @fileoverview Check that common.skipIfInspectorDisabled is used if
 *               the inspector module is required.
 * @author Daniel Bevenius <daniel.bevenius@gmail.com>
 */
'use strict';

const utils = require('./rules-utils.js');

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
const msg = 'Please add a skipIfInspectorDisabled() call to allow this ' +
            'test to be skipped when Node is built \'--without-inspector\'.';

module.exports = function(context) {
  const missingCheckNodes = [];
  let commonModuleNode = null;
  let hasInspectorCheck = false;

  function testInspectorUsage(context, node) {
    if (utils.isRequired(node, ['inspector'])) {
      missingCheckNodes.push(node);
    }

    if (utils.isCommonModule(node)) {
      commonModuleNode = node;
    }
  }

  function checkMemberExpression(context, node) {
    if (utils.usesCommonProperty(node, ['skipIfInspectorDisabled'])) {
      hasInspectorCheck = true;
    }
  }

  function reportIfMissing(context) {
    if (!hasInspectorCheck) {
      missingCheckNodes.forEach((node) => {
        context.report({
          node,
          message: msg,
          fix: (fixer) => {
            if (commonModuleNode) {
              return fixer.insertTextAfter(
                commonModuleNode,
                '\ncommon.skipIfInspectorDisabled();'
              );
            }
          }
        });
      });
    }
  }

  return {
    'CallExpression': (node) => testInspectorUsage(context, node),
    'MemberExpression': (node) => checkMemberExpression(context, node),
    'Program:exit': () => reportIfMissing(context)
  };
};