/**
   * @fileoverview Report missing `key` props in iterators/collection literals.
   * @author Ben Mosher
   */
  'use strict';
  
  // var Components = require('../util/Components');
  
  // ------------------------------------------------------------------------------
  // Rule Definition
  // ------------------------------------------------------------------------------
  
  module.exports = function(context) {
  
    function hasKeyProp(node) {
      return node.openingElement.attributes.some(function(decl) {
        if (decl.type === 'JSXSpreadAttribute') {
          return false;
        }
        return (decl.name.name === 'key');
      });
    }
  
    function checkIteratorElement(node) {
      if (node.type === 'JSXElement' && !hasKeyProp(node)) {
        context.report(node, 'Missing "key" prop for element in iterator');
      }
    }
  
    function getReturnStatement(body) {
      return body.filter(function(item) {
        return item.type === 'ReturnStatement';
      })[0];
    }
  
    return {
      JSXElement: function(node) {
        if (hasKeyProp(node)) {
          return;
        }
  
        if (node.parent.type === 'ArrayExpression') {
          context.report(node, 'Missing "key" prop for element in array');
        }
      },
  
      // Array.prototype.map
      CallExpression: function (node) {
        if (node.callee && node.callee.property && node.callee.property.name !== 'map') {
          return;
        }
  
        var fn = node.arguments[0];
        var isFn = fn && fn.type === 'FunctionExpression';
        var isArrFn = fn && fn.type === 'ArrowFunctionExpression';
  
        if (isArrFn && fn.body.type === 'JSXElement') {
          checkIteratorElement(fn.body);
        }
  
        if (isFn || isArrFn) {
          if (fn.body.type === 'BlockStatement') {
            var returnStatement = getReturnStatement(fn.body.body);
            if (returnStatement && returnStatement.argument) {
              checkIteratorElement(returnStatement.argument);
            }
          }
        }
      }
    };
  };
  
  module.exports.schema = [];