const constants = require ('../config/constants');

validateEmail = function (email) {
  if (email.length > constants.stringConstraints.EMAIL_MAX_LENGTH) return false;
  let validEmailRegex = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  return validEmailRegex.test (email);
};

validateIntentName = function (intentName) {
  if (
    intentName.length < constants.stringConstraints.INTENT_NAME_MIN_LENGTH ||
    intentName.length > constants.stringConstraints.INTENT_NAME_MAX_LENGTH
  )
    return false;
  let validIntentNameRegex = /^[a-z]*$/i;
  return validIntentNameRegex.test (intentName);
};

validateQuestion = function (question) {
  if (
    question.length < constants.stringConstraints.QUESTION_MIN_LENGTH ||
    question.length > constants.stringConstraints.QUESTION_MAX_LENGTH
  )
    return false;
  let validQuestionNameRegex = /^[a-z,.' ]*$/i;
  return validQuestionNameRegex.test (question);
};

validateAnswer = function (answer) {
  if (
    answer.length < constants.stringConstraints.ANSWER_MIN_LENGTH ||
    answer.length > constants.stringConstraints.ANSWER_MAX_LENGTH
  )
    return false;
  let validAnswerRegex = /^[a-z,.' ]*$/i;
  return validAnswerRegex.test (answer);
};

validateInvocationName = function (invocationName) {
  if (
    invocationName.length < constants.stringConstraints.INVOCATION_NAME_MIN_LENGTH ||
    invocationName.length > constants.stringConstraints.INVOCATION_NAME_MAX_LENGTH
  )
    return false;
  let validInvocationNameRegex = /^[a-z,.' ]*$/i;
  return validInvocationNameRegex.test (invocationName);
};

validateInvocationAnswer = function (invocationAnswer) {
  if (invocationAnswer.length > constants.stringConstraints.INVOCATION_ANSWER_MAX_LENGTH)
    return false;
  let validInvocationAnswerRegex = /^[a-z,.' ]*$/i;
  return validInvocationAnswerRegex.test (invocationAnswer);
};

validateIntentExplanation = function (explanation) {
  if (explanation.length > constants.stringConstraints.INTENT_EXPLANATION_MAX_LENGTH)
    return false;
  let validExplanationRegex = /^[a-z,.' ]*$/i;
  return validExplanationRegex.test (explanation);
};

module.exports = {
  validateSkill: function (skill) {
    try {
      if (
        !validateEmail (skill.contactEmail) ||
        !validateInvocationName (skill.invocationName) ||
        !validateInvocationAnswer (skill.invocationAnswer)
      )
        return false;

      for (let i = 0; i < skill.intents.length; i++) {
        if (!validateIntentName (skill.intents[i].intentName)) return false;
        if (!validateAnswer (skill.intents[i].answer)) return false;

        for (let j = 0; j < skill.intents.length; j++) {
          if (i === j) continue;
          if (skill.intents[i].intentName === skill.intents[j].intentName)
            return false;
        }

        for (let j = 0; j < skill.intents[i].questions.length; j++) {
          if (!validateQuestion (skill.intents[i].questions[j])) return false;

          for (let k = 0; k < skill.intents[i].questions.length; k++) {
            if (j === k) continue;
            if (skill.intents[i].questions[j] === skill.intents[i].questions[k])
              return false;
          }
        }
      }

      return true;
    } catch (e) {
      console.log ('Error : ' + e);
      return false;
    }
  },
};