jQuery( function ($) {
    'use strict';

    let form = $('.enterwell-prize__form');
    let message = $('.enterwell-prize__message');
    let inputs = form.find('input[required]');
    let receiptNumberInput = $('#receipt_number');
    let emailInput = $('#email');
    let input = $('.input');

    // Check input for value
    function inputValueCheck(input) {
        if (input.val()) {
            input.parent().addClass('has-value');
        } else {
            input.parent().removeClass('has-value');
        }
    }

    // Full input check
    function inputFullCheck(input) {
        inputValueCheck(input);
        clearError(input);
        if (input.attr('id') === 'email') {
            checkEmail(input);
            inputExistsCheck(input, 'email', 'Email');
        }

        if (input.attr('id') === 'receipt_number') {
            inputExistsCheck(input, 'receipt_number', 'Broj računa');
        }
    }

    // Loop through all the input elements on the page for initial values
    inputs.each(function() {
        inputFullCheck($(this));
    });

    // Checking for value on input for floating label
    input.on('input', function() {
        inputValueCheck($(this));
    });

    // Full check of input every time input loses focus
    input.on('blur', function() {
        inputFullCheck($(this));
    });

    // Prevent non numbers, excluding keycodes: backspace (8), tab (9), left arrow (37), right arrow (39), and delete (46)
    $('input[type="number"]').on('keydown', function(event) {
        if (event.keyCode !== 8 && event.keyCode !== 9 && event.keyCode !== 37 && event.keyCode !== 39 && event.keyCode !== 46 && (event.keyCode < 48 || event.keyCode > 57)) {
            event.preventDefault();
        }
    });

    // Country selector
    $('#country').countrySelect({
        defaultCountry: 'hr',
        preferredCountries: ['hr', 'si', 'hu', 'ba', 'rs', 'it'],
        localizedCountries: {
            'hr': 'Hrvatska',
            'si': 'Slovenija',
            'hu': 'Mađarska',
            'ba': 'Bosna i Hercegovina',
            'rs': 'Srbija',
            'it': 'Italija'
        },
        responsiveDropdown: true
    });

    // Clearing input errors
    function clearError(input) {
        input.removeClass('has-error invalid');
        input.parent().find('.error-message').remove()
    }

    // Adding error to input
    function addError(input, classNames, message) {
        input.addClass(classNames);
        let error = $('<div>').addClass('error-message').text(message);
        let parent = input.parent('.input-wrap');
        if (parent.find('.error-message').length > 0) {
            parent.find('.error-message').remove();
        }
        parent.append(error);
    }

    // Check for existing value when input lost focus
    function inputExistsCheck(input, name, errorMessage) {
        let inputValue = input.val();
        let apiUrl = '/enterwell/wp-json/enterwell-prize/v1/value-check';

        $.ajax({
            url: apiUrl,
            method: 'POST',
            data: { [name]: inputValue }, // bracket notation for dynamically setting the input name as key
            success: function(response) {
                if (response === 'exists') {
                    addError(input, 'has-error invalid', `*${errorMessage} je već prijavljen`);
                } else {
                    clearError(input);
                    if (input.attr('id') === 'email') {
                        checkEmail(input);
                    }
                }
            },
            error: function(xhr, status, error) {
                console.log('Error:', error);
            }
        });
    }

    // Check for email format
    function isEmailValid(email) {
        let regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return regex.test(email);
    }

    // Email input check
    function checkEmail(input) {
        let email = input.val();

        if(email === '') {
            clearError(input);
        } else if (!isEmailValid(email)) {
            clearError(input);
            addError(input, 'has-error invalid', '*Neispravna email adresa');
        }
    }

    // Validate and submit
    form.submit(function(event) {
        event.preventDefault();
        let inputs = form.find('input[required]');
        let imageInput = $('.drop-zone__input');
        let valid = true;

        inputs.each(function() {
            let input = $(this);

            if (input.val() && !input.hasClass('invalid')) {
                clearError(input);
            }
            if (!input.not(imageInput).val()) {
                addError(input, 'has-error', '*Obavezna ispuna polja');
                valid = false;
            } else {
                valid = true;
            }
        });

        // Check if image is uploaded
        // Attribute value is added on successful image upload in image-upload-js
        if (!imageInput.attr('value')) {
            //addError(imageInput, '', '*Obavezna ispuna polja');
            let parent = imageInput.parent('.drop-zone');
            parent.addClass('empty');
            let error = $('<div>').addClass('error-message').text('*Obavezna ispuna polja');
            if (parent.parent().find('.error-message').length > 0) {
                parent.parent().find('.error-message').remove();
            }
            parent.parent().append(error);
            valid = false;
        } else {
            valid = true;
        }

        // Check for errors on receipt number and email fields
        if (receiptNumberInput.hasClass('has-error') || emailInput.hasClass('has-error')) {
            valid = false;
        }

        if (!valid) {
            return false;
        } else {
            // Submit form
            const formUrl = form.attr('action');
            $.post(formUrl, form.serialize())
                .done(function () {
                    form.fadeOut(function () {
                        formEnd(
                            'icon icon-success',
                            'Uspješna prijava',
                            'Dok čekaš mail potvrde, vrati se i pročitaj zadnji korak na putu do nagrade.',
                            'OK',
                            'window.location.reload()'
                        ).hide().fadeIn();
                    });
                })

                .fail(function (xhr, textStatus, errorThrown) {
                    console.log('Error:', errorThrown);
                    form.fadeOut(function () {
                        formEnd(
                            'icon icon-fail',
                            'Neuspješna prijava',
                            'Došlo je do greške u komunikaciji. Provjeri svoju internetsku vezu i pokušaj ponovo.',
                            'Pokušaj ponovno',
                            'window.location.reload()'
                        ).hide().fadeIn();
                    });
                });
        }
    });

    // Form success and fail container
    function formEnd(iconClass, titleText, bodyText, buttonLabel, buttonFunction) {
        let wrapper = $('<div>').addClass('message-wrapper');
        let icon = $('<span>').addClass(iconClass);
        let title = $('<h2>').addClass('message-title').text(titleText);
        let body = $('<p>').addClass('message-content').text(bodyText);
        let button = $('<button>').addClass('button button-primary').attr('onclick', buttonFunction).text(buttonLabel);
        wrapper.append(icon, title, body, button);
        message.append(wrapper);
        return wrapper;
    }
});