import { showLoader, hideLoader, showAlert } from '../ui.js';
import { downloadFile } from '../utils/helpers.js';
import { state } from '../state.js';

export async function flatten() {
    if (!state.pdfDoc) {
        showAlert('Error', 'PDF not loaded.');
        return;
    }
    showLoader('Flattening PDF...');
    try {
        const form = state.pdfDoc.getForm();
        form.flatten();

        const flattenedBytes = await state.pdfDoc.save();
        downloadFile(new Blob([flattenedBytes], { type: 'application/pdf' }), 'flattened.pdf');
    } catch (e) {
        console.error(e);
        if (e.message.includes('getForm')) {
            showAlert('No Form Found', 'This PDF does not contain any form fields to flatten.');
        } else {
            showAlert('Error', 'Could not flatten the PDF.');
        }
    } finally {
        hideLoader();
    }
}