import { ZikoUIFlex } from "../../custom-elements/Flex";

class ZikoUIForm extends ZikoUIFlex {
    constructor(...items) {
        super("form", "Form");
        this.append(...items);
        this.setMethod("POST");
        // this.setAction("/");
        // this.addCSRFToken();  // Add CSRF token field by default
    }
    setAction(action = "/") {
        // Ensure the action URL is trusted before setting it
        if (this.isTrustedURL(action)) {
            this.setAttr("action", action);
        } else {
            throw new Error('Untrusted action URL.');
        }
        return this;
    }
    setMethod(method = "post") {
        const validMethods = ["post", "get"];
        if (validMethods.includes(method.toLowerCase())) {
            this.setAttr("method", method);
        } else {
            throw new Error('Invalid HTTP method.');
        }
        return this;
    }

    get data() {
        const formData = new FormData(this.element);
        this.items.forEach(n => {
            if (n.isInput || n.isSelect || n.isTextarea) {
                // Sanitize input values before appending
                formData.append(n.element.name, this.#sanitizeInput(n.value));
            }
        });
        return formData;
    }

    // Sanitize input data to prevent XSS
    #sanitizeInput(input) {
        const div = document?.createElement('div');
        div.textContent = input;
        return div.innerHTML;
    }

    // Include a CSRF token in the form
    addCSRFToken() {
        const token = this.getCSRFTokenFromServer();
        const hiddenInput = document?.createElement('input');
        hiddenInput.type = 'hidden';
        hiddenInput.name = 'csrf_token';
        hiddenInput.value = token;
        this.element?.append(hiddenInput);
    }

    // Method to fetch CSRF token from the server (mocked here)
    getCSRFTokenFromServer() {
        // Replace with real token fetching logic
        return 'mocked_csrf_token';
    }

    sendFormData() {
        fetch(this.element.action, {
            method: this.element.method,
            body: this.data,
            headers: {
                'X-CSRF-Token': this.getByName('csrf_token'),  // Add CSRF token header
            }
        })
        .then(response => {
            if (!response.ok) {
                throw new Error('Network response was not ok');
            }
            return response.json();
        })
        .then(data => console.log('Success:', data))
        .catch(error => {
            console.error('Error:', error.message || error);
        });
        return this;
    }

    getByName(name) {
        return this.data.get(name);
    }

    // Check if the action URL is trusted
    isTrustedURL(url) {
        const trustedDomains = ['/','yourdomain.com', 'anothertrustedsite.com'];
        try {
            const urlObj = new URL(url);
            return trustedDomains.includes(urlObj.hostname);
        } catch (e) {
            return false;
        }
    }
}
const Form = (...items) => new ZikoUIForm(...items);
export {
    Form,
    ZikoUIForm
};