'use strict';

module.exports = function defFunc(ajv) {
  defFunc.definition = {
    type: 'number',
    macro: function (schema, parentSchema) {
      var min = schema[0]
        , max = schema[1]
        , exclusive = parentSchema.exclusiveRange;

      validateRangeSchema(min, max, exclusive);

      return exclusive === true
              ? {exclusiveMinimum: min, exclusiveMaximum: max}
              : {minimum: min, maximum: max};
    },
    metaSchema: {
      type: 'array',
      minItems: 2,
      maxItems: 2,
      items: { type: 'number' }
    }
  };

  ajv.addKeyword('range', defFunc.definition);
  ajv.addKeyword('exclusiveRange');
  return ajv;

  function validateRangeSchema(min, max, exclusive) {
    if (exclusive !== undefined && typeof exclusive != 'boolean')
      throw new Error('Invalid schema for exclusiveRange keyword, should be boolean');

    if (min > max || (exclusive && min == max))
      throw new Error('There are no numbers in range');
  }
};