background.js

// Background script to handle downloads
chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
    if (request.action === 'downloadCSV') {
        // Handle the download asynchronously
        handleDownload(request, sendResponse);
        return true; // Keep message channel open for async response
    }
});

async function handleDownload(request, sendResponse) {
    try {
        // Convert CSV data to base64 data URL
        const csvData = request.csvData;
        const base64Data = btoa(unescape(encodeURIComponent(csvData)));
        const dataUrl = `data:text/csv;charset=utf-8;base64,${base64Data}`;
        
        const downloadId = await new Promise((resolve, reject) => {
            chrome.downloads.download({
                url: dataUrl,
                filename: request.filename,
                saveAs: false // Set to true if you want to show save dialog
            }, (downloadId) => {
                if (chrome.runtime.lastError) {
                    reject(chrome.runtime.lastError);
                } else {
                    resolve(downloadId);
                }
            });
        });
        
        console.log('Download started with ID:', downloadId);
        sendResponse({success: true, downloadId: downloadId});
        
    } catch (error) {
        console.error('Download failed:', error);
        sendResponse({success: false, error: error.message});
    }
}