/**
 * This file contains util functions that are common between versions
 */

const parse = require('../parse.js');

module.exports = {

  /**
   * Parses an OAS string/object as a YAML or JSON
   * @param {YAML/JSON} openApiSpec - The OAS 3.x specification specified in either YAML or JSON
   * @param {object} inputValidation - Concrete validator according to version
   * @returns {Object} - Contains the parsed JSON-version of the OAS spec, or an error
   * @no-unit-test
   */
  parseSpec: function (openApiSpec, inputValidation) {
    var openApiObj = openApiSpec,
      obj,
      rootValidation;

    // If the open api specification is a string could be YAML or JSON
    if (typeof openApiSpec === 'string') {
      obj = parse.getOasObject(openApiSpec);
      if (obj.result) {
        openApiObj = obj.oasObject;
      }
      else {
        return obj;
      }
    }

    // spec is a valid JSON object at this point

    // Validate the root level object for semantics
    rootValidation = inputValidation.validateSpec(openApiObj);
    if (!rootValidation.result) {
      return {
        result: false,
        reason: rootValidation.reason
      };
    }

    // Valid openapi root object
    return {
      result: true,
      openapi: rootValidation.openapi
    };
  },

  formatDataPath: function(dataPath) {
    let initialDotIfExist = dataPath[0] === '/' ? '.' : '',
      splittedDataPath = dataPath.split('/'),
      isANumber = (value) => {
        return !isNaN(value);
      },
      formattedElements = splittedDataPath.map((element) => {
        if (element !== '' && isANumber(element)) {
          return `[${element}]`;
        }
        return element;
      }),
      formattedDataPath = formattedElements.join('');

    return `${initialDotIfExist}${formattedDataPath}`;
  },

  handleExclusiveMaximum: function(schema, max) {
    max = schema.hasOwnProperty('maximum') ?
      schema.maximum :
      max;
    if (schema.hasOwnProperty('exclusiveMaximum')) {
      if (typeof schema.exclusiveMaximum === 'boolean') {
        return schema.multipleOf ?
          max - schema.multipleOf :
          max - 1;
      }
      else if (typeof schema.exclusiveMaximum === 'number') {
        return schema.multipleOf ?
          schema.exclusiveMaximum - schema.multipleOf :
          schema.exclusiveMaximum - 1;
      }
    }
    return max;
  },

  handleExclusiveMinimum: function(schema, min) {
    min = schema.hasOwnProperty('minimum') ?
      schema.minimum :
      min;
    if (schema.hasOwnProperty('exclusiveMinimum')) {
      if (typeof schema.exclusiveMinimum === 'boolean') {
        return schema.multipleOf ?
          min + schema.multipleOf :
          min + 1;
      }
      else if (typeof schema.exclusiveMinimum === 'number') {
        return schema.multipleOf ?
          schema.exclusiveMinimum + schema.multipleOf :
          schema.exclusiveMinimum + 1;
      }
    }
    return min;
  }
};