'use strict';

/**
 * Validate Event names to keep data clean
 */
const chalk = require('chalk');

const VALID_TRACKING_PROJECTS = ['framework'];
const VALID_TRACKING_OBJECTS = ['user'];

function containsSeparators(eventName) {
  const underscores = (eventName.match(/_/g) || []).length;
  const colons = (eventName.match(/:/g) || []).length;
  if (underscores !== 1) {
    console.log(chalk.red('Tracking Error:')); // eslint-disable-line
    console.log(chalk.red(`Event name must have single underscore. "${eventName}" contains ${underscores}`)); // eslint-disable-line
    return false;
  }
  if (colons !== 1) {
    console.log(chalk.red('Tracking Error:')); // eslint-disable-line
    console.log(chalk.red(`Event name must have single colon. "${eventName}" contains ${colons}`)); // eslint-disable-line
    return false;
  }
  return true;
}

// Validate tracking project for clean events
function isValidProject(project) {
  const isValid = VALID_TRACKING_PROJECTS.indexOf(project) !== -1;
  if (!isValid) {
    console.log(chalk.red('Tracking Error:')); // eslint-disable-line
    console.log(`"${project}" is invalid project. Must be one of`, VALID_TRACKING_PROJECTS); // eslint-disable-line
  }
  return isValid;
}

// Validate tracking objects for clean events
function isValidObject(key) {
  const isValid = VALID_TRACKING_OBJECTS.indexOf(key) !== -1;
  if (!isValid) {
    console.log(chalk.red('Tracking Error:')); // eslint-disable-line
    console.log(`"${key}" is invalid tracking object. Must be one of`, VALID_TRACKING_OBJECTS); // eslint-disable-line
  }
  return isValid;
}

function formattingWarning(eventName) {
  /*eslint-disable */
  console.log(chalk.red(`Incorrect tracking event format: "${eventName}"`));
  console.log('Tracking event must match ' + chalk.yellow("product:objectName_actionName"));
  console.log('It must be all camelCase: ' + chalk.yellow("camelCase:camelCase_camelCase"));
  console.log('Here is an Example ' + chalk.green("framework:user_loggedIn"));
  console.log('Note: `framework:` is automatically prepended');
  console.log('Usage:', chalk.yellow(`track('user_loggedIn', { ..extraData });`));
  console.log('-----------------------------');
  /*eslint-enable */
  return false;
}

// validate events to naming conventions. clean data FTW!
module.exports = function isValidEventName(eventName) {
  // match framework:objectName_actionName
  const matches = eventName.match(/([a-zA-Z]*):([a-zA-Z]*)_(.*)/);
  if (!containsSeparators(eventName) || !matches) {
    return formattingWarning(eventName);
  }
  const project = matches[1];
  const object = matches[2];
  const action = matches[3];
  // console.log(`${project}:${object}_${action}`)

  // if missing any parts of event, exit;
  if (!project || !object || !action) {
    return formattingWarning(eventName);
  }
  // validate project name
  if (!isValidProject(project)) {
    return formattingWarning(eventName);
  }
  // validate object name
  if (!isValidObject(object)) {
    return formattingWarning(eventName);
  }
  return true;
};