'use strict';

var KNOWN_TYPES = ['undefined', 'string', 'number', 'object', 'function', 'boolean', 'symbol'];

module.exports = function defFunc(ajv) {
  defFunc.definition = {
    inline: function (it, keyword, schema) {
      var data = 'data' + (it.dataLevel || '');
      if (typeof schema == 'string') return 'typeof ' + data + ' == "' + schema + '"';
      schema = 'validate.schema' + it.schemaPath + '.' + keyword;
      return schema + '.indexOf(typeof ' + data + ') >= 0';
    },
    metaSchema: {
      anyOf: [
        {
          type: 'string',
          enum: KNOWN_TYPES
        },
        {
          type: 'array',
          items: {
            type: 'string',
            enum: KNOWN_TYPES
          }
        }
      ]
    }
  };

  ajv.addKeyword('typeof', defFunc.definition);
  return ajv;
};