/**
 * Parsley validation for the leads form. Does not strip or rewrite user input;
 * invalid values are reported via Parsley messages only.
 */
(function (getJq) {
    'use strict';

    function $(selector, context) {
        var jq = getJq();
        if (!jq) {
            return { length: 0 };
        }
        return arguments.length > 1 ? jq(selector, context) : jq(selector);
    }

    var TEXT_ALLOWED = /^[A-Za-z0-9/_.\- ]*$/;
    var EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    var FORM_SELECTOR = '#leads_form_id';
    var NS = '.leadsFormValidate';

    var MESSAGES = {
        text: 'Only letters, numbers, spaces, and the characters / _ - . are allowed.',
        mobile: 'Mobile number must be exactly 10 digits (numbers only).',
        email: 'Please enter a valid email address.'
    };

    function isParsleyReady() {
        return !!window.Parsley;
    }

    function isSkippableField(el) {
        if (!el || el.disabled || el.type === 'hidden') {
            return true;
        }
        if (el.classList && el.classList.contains('select2-search__field')) {
            return true;
        }
        return false;
    }

    function isVisibleForValidation(el) {
        if (isSkippableField(el)) {
            return false;
        }

        var jq = getJq();
        if (!jq) {
            return true;
        }

        var $el = jq(el);
        if (!$el.length || !$el.is(':visible')) {
            return false;
        }

        return $el.closest('.form-group, .dynamic-form-row, .claim-row, .col-md-4, .col-md-12').filter(function () {
            var display = jq(this).css('display');
            return display === 'none';
        }).length === 0;
    }

    function isEmptyValue(val) {
        if (val == null || val === '') {
            return true;
        }
        if (Array.isArray(val)) {
            return val.length === 0;
        }
        return String(val).trim() === '';
    }

    function isPanOrGstField(el) {
        if (!el) {
            return false;
        }
        var id = (el.id || '').toLowerCase();
        return id === 'pan' || id === 'gst';
    }

    function isEmailField(el) {
        if (!el) {
            return false;
        }
        var id = (el.id || '').toLowerCase();
        var name = (el.name || '').toLowerCase();
        var type = (el.type || '').toLowerCase();
        return id === 'contact_person_email' || name === 'contact_person_email' || type === 'email';
    }

    function isMobileField(el) {
        if (!el) {
            return false;
        }
        var id = (el.id || '').toLowerCase();
        var name = (el.name || '').toLowerCase();
        return id === 'contact_person_mobile' || name === 'contact_person_mobile';
    }

    function isCharsetCandidate(el) {
        if (!el || el.tagName === 'SELECT') {
            return false;
        }
        var type = (el.type || '').toLowerCase();
        if (type === 'file' || type === 'checkbox' || type === 'radio' || type === 'password' || type === 'submit' || type === 'button' || type === 'reset') {
            return false;
        }
        if (isPanOrGstField(el) || isEmailField(el) || isMobileField(el)) {
            return false;
        }
        return true;
    }

    function registerValidators() {
        if (!isParsleyReady() || window.Parsley.__leadsFormValidatorsRegistered) {
            return;
        }

        window.Parsley.addValidator('leadscharset', {
            validateString: function (value) {
                if (!value || String(value).trim() === '') {
                    return true;
                }
                return TEXT_ALLOWED.test(String(value));
            },
            messages: { en: MESSAGES.text }
        });

        window.Parsley.addValidator('leadsmobile10', {
            validateString: function (value, req, instance) {
                var v = String(value || '').replace(/\D/g, '');
                if (!instance.$element.prop('required') && v.length === 0) {
                    return true;
                }
                if (instance.$element.prop('required') && v.length === 0) {
                    return false;
                }
                return v.length === 10;
            },
            messages: { en: MESSAGES.mobile }
        });

        window.Parsley.addValidator('leadsemail', {
            validateString: function (value) {
                if (!value || String(value).trim() === '') {
                    return true;
                }
                return EMAIL_RE.test(String(value).trim());
            },
            messages: { en: MESSAGES.email }
        });

        window.Parsley.__leadsFormValidatorsRegistered = true;
    }

    function clearAttrs($el) {
        ['data-parsley-leadscharset', 'data-parsley-leadsmobile10', 'data-parsley-leadsemail'].forEach(function (a) {
            $el.removeAttr(a);
        });
    }

    function applyConstraints($form) {
        if (!$form || !$form.length) {
            return;
        }

        $form.find('input, textarea, select').each(function () {
            var el = this;
            var $el = $(el);

            if (isSkippableField(el) || isPanOrGstField(el)) {
                return;
            }

            clearAttrs($el);

            if (isMobileField(el)) {
                $el.attr('data-parsley-leadsmobile10', 'true');
                if (!$el.attr('data-parsley-trigger')) {
                    $el.attr('data-parsley-trigger', 'input change');
                }
                return;
            }

            if (isEmailField(el)) {
                $el.attr('data-parsley-leadsemail', 'true');
                if (!$el.attr('data-parsley-trigger')) {
                    $el.attr('data-parsley-trigger', 'input change');
                }
                return;
            }

            if (isCharsetCandidate(el)) {
                $el.attr('data-parsley-leadscharset', 'true');
                if (!$el.attr('data-parsley-trigger')) {
                    $el.attr('data-parsley-trigger', 'input change');
                }
                return;
            }

            if (el.tagName === 'SELECT' && !$el.attr('data-parsley-trigger')) {
                $el.attr('data-parsley-trigger', 'change');
            }
        });
    }

    function refreshParsley($form) {
        if (!$form || !$form.length || !isParsleyReady()) {
            return;
        }
        try {
            var instance = $form.parsley();
            if (instance && typeof instance.refresh === 'function') {
                instance.refresh();
            }
        } catch (e) {
            // no-op
        }
    }

    function validateField(field) {
        if (!field || !isVisibleForValidation(field) || !isParsleyReady()) {
            return;
        }
        var $field = $(field);
        var $form = $field.closest('form');
        if (!$form.length || typeof $field.parsley !== 'function') {
            return;
        }

        applyConstraints($form);
        refreshParsley($form);

        try {
            $field.parsley().validate();
        } catch (e) {
            // no-op
        }
    }

    function prepareHiddenFieldsForSubmit($form) {
        if (!$form || !$form.length) {
            return;
        }

        $form.find('input, textarea, select').each(function () {
            var el = this;
            var $el = $(el);

            if (isVisibleForValidation(el)) {
                return;
            }

            $el.removeAttr('required').prop('required', false);
            clearAttrs($el);

            try {
                if (typeof $el.parsley === 'function') {
                    var fieldInstance = $el.parsley();
                    if (fieldInstance && typeof fieldInstance.reset === 'function') {
                        fieldInstance.reset();
                    }
                }
            } catch (e) {
                // no-op
            }
        });
    }

    function getInvalidFields($form) {
        var invalid = [];

        if (!$form || !$form.length || !isParsleyReady()) {
            return invalid;
        }

        var instance = $form.parsley();
        if (!instance) {
            return invalid;
        }

        instance.fields.forEach(function (field) {
            if (field.isValid()) {
                return;
            }

            var el = field.$element[0];
            if (!isVisibleForValidation(el)) {
                return;
            }

            var val = field.$element.val();
            invalid.push({
                id: field.$element.attr('id') || '',
                name: field.$element.attr('name') || '',
                label: (field.$element.closest('.form-group, .mb-3, .col-md-4, .col-lg-4').find('label').first().text() || '').trim(),
                messages: field.getErrorsMessages ? field.getErrorsMessages() : [],
                isEmpty: isEmptyValue(val)
            });
        });

        return invalid;
    }

    function init() {
        var $form = $(FORM_SELECTOR);
        if (!$form.length || !isParsleyReady()) {
            return;
        }

        registerValidators();
        prepareHiddenFieldsForSubmit($form);
        applyConstraints($form);
        refreshParsley($form);

        $form.off(NS);
        $form.on('input' + NS, 'input:not([type=hidden]), textarea', function () {
            validateField(this);
        });
        $form.on('change' + NS, 'select, input:not([type=hidden]), textarea', function () {
            validateField(this);
        });
    }

    $(function () {
        init();
    });

    window.refreshLeadsFormValidation = function () {
        init();
    };

    window.prepareLeadsFormForSubmit = function () {
        var $form = $(FORM_SELECTOR);
        if (!$form.length || !isParsleyReady()) {
            return;
        }

        registerValidators();
        prepareHiddenFieldsForSubmit($form);
        applyConstraints($form);
        refreshParsley($form);
    };

    window.getLeadsFormInvalidFields = function () {
        return getInvalidFields($(FORM_SELECTOR));
    };
})(function () {
    return window.jQuery;
});