/**
 * @fileoverview Limit maximum of props on a single line in JSX
 * @author Yannick Croissant
 */

'use strict';

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

module.exports = function (context) {

  var configuration = context.options[0] || {};
  var maximum = configuration.maximum || 1;

  function getPropName(propNode) {
    if (propNode.type === 'JSXSpreadAttribute') {
      return context.getSource(propNode.argument);
    }
    return propNode.name.name;
  }

  return {
    JSXOpeningElement: function (node) {
      var props = {};

      node.attributes.forEach(function(decl) {
        var line = decl.loc.start.line;
        if (props[line]) {
          props[line].push(decl);
        } else {
          props[line] = [decl];
        }
      });

      for (var line in props) {
        if (!props.hasOwnProperty(line)) {
          continue;
        }
        if (props[line].length > maximum) {
          var name = getPropName(props[line][maximum]);
          context.report(props[line][maximum], 'Prop `' + name + '` must be placed on a new line');
          break;
        }
      }
    }
  };
};

module.exports.schema = [{
  type: 'object',
  properties: {
    maximum: {
      type: 'integer',
      minimum: 1
    }
  }
}];