"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.appendRegistration = appendRegistration;
exports.calculateAge = calculateAge;
exports.clearFormData = clearFormData;
exports.getFormData = getFormData;
exports.getRegistrations = getRegistrations;
exports.handleSubmit = handleSubmit;
exports.isAdult = isAdult;
exports.isFrenchCodePostal = isFrenchCodePostal;
exports.saveFormData = saveFormData;
exports.saveRegistrations = saveRegistrations;
exports.validateCodePostal = validateCodePostal;
exports.validateDateOfBirth = validateDateOfBirth;
exports.validateEmail = validateEmail;
exports.validateFormData = validateFormData;
exports.validateName = validateName;
exports.validatePrenom = validatePrenom;
exports.validateVille = validateVille;
const FORM_DATA_KEY = "formData";
const REGISTRATIONS_KEY = "registrations";

/**
 * Calculate a person's age in years.
 * 
 * @param {Date} birthDate - The birth date of the person.
 * @returns {Number} - The age in years of the person.
 */
function calculateAge(birthDate) {
  if (!birthDate) {
    throw new Error("missing param birthDate");
  }
  if (!(birthDate instanceof Date)) {
    throw new Error("birthDate is not a Date");
  }
  if (isNaN(birthDate.getTime())) {
    throw new Error("birthDate is not a valid Date");
  }
  let dateDiff = new Date(Date.now() - birthDate.getTime());
  let age = Math.abs(dateDiff.getUTCFullYear() - 1970);
  return age;
}

/**
 * Validate the name string.
 * 
 * @param {String} name - The name string to validate.
 * @returns {String} - The validated name string.
 */
function validateName(name) {
  if (!name) {
    throw new Error("name is required");
  }
  if (typeof name !== 'string') {
    throw new Error("name must be a string");
  }
  const trimmedName = name.trim();
  if 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{
    throw new Error("name must be a valid name");
  }
  return trimmedName;
}

/**
 * Validate the prenom string.
 * 
 * @param {String} prenom - The prenom string to validate.
 * @returns {String} - The validated prenom string.
 */
function validatePrenom(prenom) {
  if (!prenom) {
    throw new Error("prenom is required");
  }
  if (typeof prenom !== 'string') {
    throw new Error("prenom must be a string");
  }
  const trimmedPrenom = prenom.trim();
  if 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{
    throw new Error("prenom must be a valid prenom");
  }
  return trimmedPrenom;
}

/**
 * Validate the email string.
 * 
 * @param {String} email - The email string to validate.
 * @returns {String} - The validated email string.
 */
function validateEmail(email) {
  if (!email) {
    throw new Error("email is required");
  }
  if (typeof email !== 'string') {
    throw new Error("email must be a string");
  }
  const trimmedEmail = email.trim();
  if (!trimmedEmail.match(/^[^\s@]+@[^\s@]+\.[^\s@]+$/)) {
    throw new Error("email must be a valid email address");
  }
  return trimmedEmail;
}

/**
 * Validate the date of birth string.
 * 
 * @param {String} dateOfBirth - The date of birth string to validate.
 * @returns {String} - The validated date of birth string.
 */
function validateDateOfBirth(dateOfBirth) {
  if (!dateOfBirth) {
    throw new Error("date of birth is required");
  }
  if (typeof dateOfBirth !== 'string') {
    throw new Error("date of birth must be a string");
  }
  const trimmedDateOfBirth = dateOfBirth.trim();
  const parsedDate = parseDateOfBirth(trimmedDateOfBirth);
  if (!parsedDate) {
    throw new Error("date of birth must be a valid date");
  }
  if (!isAdult(parsedDate)) {
    throw new Error("date of birth must be at least 18 years old");
  }
  return trimmedDateOfBirth;
}

/**
 * Validate the ville string.
 * 
 * @param {String} ville - The ville string to validate.
 * @returns {String} - The validated ville string.
 */
function validateVille(ville) {
  if (!ville) {
    throw new Error("ville is required");
  }
  if (typeof ville !== 'string') {
    throw new Error("ville must be a string");
  }
  const trimmedVille = ville.trim();
  if 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{
    throw new Error("ville must be a valid ville");
  }
  return trimmedVille;
}

/**
 * Validate the code postal string.
 * 
 * @param {String} codePostal - The code postal string to validate.
 * @returns {String} - The validated code postal string.
 */
function validateCodePostal(codePostal) {
  if (!codePostal) {
    throw new Error("code postal is required");
  }
  if (typeof codePostal !== 'string') {
    throw new Error("code postal must be a string");
  }
  const trimmedCodePostal = codePostal.trim();
  if (!isFrenchCodePostal(trimmedCodePostal)) {
    throw new Error("code postal must be a valid code postal");
  }
  return trimmedCodePostal;
}

/**
 * Validate the form data object.
 * 
 * @param {FormData} formData - The form data object to validate.
 * @returns {Object} - The validated form data object.
 */
function validateFormData(formData) {
  if (!formData) {
    throw new Error("form data is required");
  }
  if (!(formData instanceof FormData)) {
    throw new Error("form data must be a FormData");
  }
  const data = Object.fromEntries(formData);
  return {
    nom: validateName(data.nom),
    prenom: validatePrenom(data.prenom),
    email: validateEmail(data.email),
    dateOfBirth: validateDateOfBirth(data.dateOfBirth),
    ville: validateVille(data.ville),
    codePostal: validateCodePostal(data.codePostal)
  };
}

/**
 * Check if the date of birth string is an adult.
 * 
 * @param {Date} dateOfBirth - The date of birth to check.
 * @returns {Boolean} - True if the date of birth string is an adult, false otherwise.
 */
function isAdult(dateOfBirth) {
  const age = calculateAge(dateOfBirth);
  return age >= 18;
}

/**
 * Parse date of birth from supported formats:
 * YYYY-MM-DD, YYYY/MM/DD, DD/MM/YYYY, DD-MM-YYYY.
 *
 * @param {String} rawDateOfBirth - The date string to parse.
 * @returns {Date|null} - Parsed date if valid, otherwise null.
 */
function parseDateOfBirth(rawDateOfBirth) {
  const dateOfBirth = rawDateOfBirth.trim();
  const yearFirstMatch = dateOfBirth.match(/^(\d{4})[-/](\d{2})[-/](\d{2})$/);
  if (yearFirstMatch) {
    return buildValidDate(Number(yearFirstMatch[1]), Number(yearFirstMatch[2]), Number(yearFirstMatch[3]));
  }
  const dayFirstMatch = dateOfBirth.match(/^(\d{2})[-/](\d{2})[-/](\d{4})$/);
  if (dayFirstMatch) {
    return buildValidDate(Number(dayFirstMatch[3]), Number(dayFirstMatch[2]), Number(dayFirstMatch[1]));
  }
  return null;
}

/**
 * Build a date and ensure day/month/year are real.
 *
 * @param {Number} year - Year component.
 * @param {Number} month - Month component (1-12).
 * @param {Number} day - Day component (1-31).
 * @returns {Date|null} - Date when valid, otherwise null.
 */
function buildValidDate(year, month, day) {
  const date = new Date(year, month - 1, day);
  if (date.getFullYear() !== year || date.getMonth() !== month - 1 || date.getDate() !== day) {
    return null;
  }
  return date;
}

/**
 * Check if the code postal is a valid French code postal.
 * 
 * @param {String} codePostal - The code postal string to check.
 * @returns {Boolean} - True if the code postal is a valid French code postal, false otherwise.
 */
function isFrenchCodePostal(codePostal) {
  if (typeof codePostal !== 'string') {
    return false;
  }
  const trimmedCodePostal = codePostal.trim();

  // Metropolitan France (01-95), including Corsica postal codes (20xxx).
  const metropolitanPattern = /^(?:0[1-9]|[1-8]\d|9[0-5])\d{3}$/;
  // Overseas departments/collectivities (971-978, 984-989).
  const overseasPattern = /^(?:97[1-8]|98[4-9])\d{2}$/;
  return metropolitanPattern.test(trimmedCodePostal) || overseasPattern.test(trimmedCodePostal);
}

/**
 * Save the form data object to localStorage.
 * 
 * @param {Object} formData - The form data object to save.
 */
function saveFormData(formData) {
  try {
    localStorage.setItem(FORM_DATA_KEY, JSON.stringify(formData));
  } catch (error) {
    throw new Error("unable to save form data");
  }
}

/**
 * Get the form data object from localStorage.
 * 
 * @returns {Object} - The form data object.
 */
function getFormData() {
  const rawFormData = localStorage.getItem(FORM_DATA_KEY);
  if (!rawFormData) {
    return null;
  }
  try {
    return JSON.parse(rawFormData);
  } catch (error) {
    throw new Error("unable to parse saved form data");
  }
}

/**
 * Clear the form data object from localStorage.
 */
function clearFormData() {
  localStorage.removeItem(FORM_DATA_KEY);
}

/**
 * Save registrations list to localStorage.
 *
 * @param {Object[]} registrations - Registrations list.
 */
function saveRegistrations(registrations) {
  try {
    localStorage.setItem(REGISTRATIONS_KEY, JSON.stringify(registrations));
  } catch (error) {
    throw new Error("unable to save registrations");
  }
}

/**
 * Get registrations list from localStorage.
 *
 * @returns {Object[]} - Registrations list.
 */
function getRegistrations() {
  const rawRegistrations = localStorage.getItem(REGISTRATIONS_KEY);
  if (!rawRegistrations) {
    return [];
  }
  try {
    const parsedRegistrations = JSON.parse(rawRegistrations);
    if (!Array.isArray(parsedRegistrations)) {
      throw new Error("invalid registrations format");
    }
    return parsedRegistrations;
  } catch (error) {
    throw new Error("unable to parse saved registrations");
  }
}

/**
 * Append a validated registration to localStorage.
 *
 * @param {Object} registration - Validated registration data.
 * @returns {Object} - Saved registration data.
 */
function appendRegistration(registration) {
  const registrations = getRegistrations();
  const nextRegistrations = [...registrations, registration];
  saveRegistrations(nextRegistrations);
  return registration;
}

/**
 * Handle the form submission event.
 * 
 * @param {Event} e - The form submission event.
 */
function handleSubmit(e) {
  e.preventDefault();
  const formData = new FormData(e.target);
  const validatedData = validateFormData(formData);
  appendRegistration(validatedData);
  return validatedData;
}