(function (window, document) {
    "use strict";

    const FORMATS = Object.freeze({
        Email: /^\S*\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,8}\b\S*$/,
        Numeric: /^\d*$/,
        AlphaNumeric: /^[a-zA-Z0-9_*\/\-]*$/,
        AlphaSpace: /^[a-zA-Z0-9()\/ &]*$/,
        LoanAmount: /^[a-zA-Z0-9. ]*$/,
        SplInstruction: /^[a-zA-Z0-9():,#@.\-\/ ]*$/,
        Remarks: /^[a-zA-Z0-9,(),:+&#@'.\-\/ ]*$/,
        Pincode: /^\d{6}$/,
        Phone: /^((\d{6,8}|\d{10}|\d{3}-\d{6,8})([\/](\d{6,8}|\d{10}|\d{3}-\d{6,8})){0,2})$/,
        Extension: /^\d{3,4}$/
    });
    const DATE_PATTERN = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/;

    function sanitize(value, options) {
        const multiline = Boolean(options && options.multiline);
        let sanitized = String(value == null ? "" : value).replace(/\t/g, "");
        if (multiline) {
            sanitized = sanitized.replace(/\r\n?/g, "\n").replace(/[^\x20-\x7E\n]/g, "");
        } else {
            sanitized = sanitized.replace(/[\r\n]/g, "").replace(/[^\x20-\x7E]/g, "");
        }
        return sanitized.trim();
    }

    function sanitizeElement(element) {
        if (!element || typeof element.value !== "string") return "";
        const tagName = element.tagName ? element.tagName.toLowerCase() : "";
        const inputType = (element.type || "text").toLowerCase();
        const sanitizableInput = tagName === "input" &&
            ["text", "search", "tel", "email", "url", "password"].includes(inputType);
        if (tagName !== "textarea" && !sanitizableInput) return element.value;
        const sanitized = sanitize(element.value, { multiline: tagName === "textarea" });
        if (element.value !== sanitized) element.value = sanitized;
        return sanitized;
    }

    function valueOf(element) {
        return element && typeof element.value === "string" ? element.value.trim() : "";
    }

    function isEmpty(element) {
        const value = valueOf(element);
        return value === "" || (element.type === "select-one" && value === "-1");
    }

    function isDate(value) {
        const parts = DATE_PATTERN.exec(value);
        if (!parts) return false;
        const day = Number(parts[1]);
        const month = Number(parts[2]);
        const year = Number(parts[3]);
        if (year < 1900 || year > 2100 || month < 1 || month > 12) return false;
        const date = new Date(year, month - 1, day);
        return date.getFullYear() === year && date.getMonth() === month - 1 && date.getDate() === day;
    }

    function matchesFormat(value, format) {
        if (!value || !format || format === "AllowWrong") return true;
        const normalized = Object.keys(FORMATS).find((name) => name.toLowerCase() === format.toLowerCase());
        if (format.toLowerCase() === "date") return isDate(value);
        return normalized ? FORMATS[normalized].test(value) : true;
    }

    function errorHost(element) {
        let current = element.parentNode;
        let host = current;
        while (current && current !== document.body) {
            if ((" " + (current.className || "") + " ").indexOf(" inputcontainer ") !== -1) return current;
            current = current.parentNode;
        }
        return host;
    }

    function clearError(element) {
        if (!element) return;
        const icon = document.getElementById("err" + element.id);
        if (icon && icon.parentNode) icon.parentNode.removeChild(icon);
        element.classList.remove("errtxt");
        if (element.parentNode) element.parentNode.classList.remove("errdiv");
        element.removeAttribute("aria-invalid");
        element.removeAttribute("aria-describedby");
        if (typeof element.setCustomValidity === "function") element.setCustomValidity("");
    }

    function showError(element, message) {
        if (!element) return;
        clearError(element);
        const host = errorHost(element);
        const icon = document.createElement("img");
        icon.src = "/matrix/images/exclamation.png";
        icon.id = "err" + element.id;
        icon.alt = message;
        icon.title = message;
        icon.className = "matrix-validation-error-icon" +
            (element.type === "select-one" ? " matrix-validation-error-icon--select" : "");
        icon.style.cssText = "position:absolute;right:" + (element.type === "select-one" ? "24px" : "5px") +
            ";top:50%;width:14px;height:14px;transform:translateY(-50%);z-index:3;pointer-events:none";
        host.style.position = "relative";
        host.appendChild(icon);
        if (element.type === "select-one") element.parentNode.classList.add("errdiv");
        else element.classList.add("errtxt");
        element.setAttribute("aria-invalid", "true");
        element.setAttribute("aria-describedby", icon.id);
        if (typeof element.setCustomValidity === "function") element.setCustomValidity(message);
    }

    function validateElement(element, rule) {
        if (!element) return true;
        sanitizeElement(element);
        if (typeof rule.when === "function" && !rule.when()) {
            clearError(element);
            return true;
        }
        const required = typeof rule.required === "function" ? rule.required() : Boolean(rule.required);
        let message = "";
        if (required && isEmpty(element)) message = rule.requiredMessage || "This field is required.";
        else if (!isEmpty(element) && !matchesFormat(valueOf(element), rule.format)) {
            message = rule.formatMessage || "Enter a valid value.";
        }
        if (message) showError(element, message);
        else clearError(element);
        return message === "";
    }

    function validateLegacy(element, requiredFlag, format) {
        return validateElement(element, { required: requiredFlag === "t", format: format });
    }

    function validateRules(rules) {
        const invalid = [];
        Object.keys(rules).forEach(function (id) {
            const element = document.getElementById(id);
            if (!validateElement(element, rules[id])) invalid.push(element);
        });
        return { valid: invalid.length === 0, invalid: invalid };
    }

    window.CygnusFormValidation = Object.freeze({
        clearError: clearError,
        sanitize: sanitize,
        sanitizeElement: sanitizeElement,
        validateElement: validateElement,
        validateLegacy: validateLegacy,
        validateRules: validateRules
    });
}(window, document));