quality_recticel/windows_print_service/chrome_extension/background.js

/**
 * Quality Label Printing Extension - Windows Service Communication
 * Communicates with local Windows print service for silent printing
 */

console.log('Quality Label Printing Extension - Windows Service Mode');

// Service configuration
const PRINT_SERVICE_URL = 'http://localhost:8765';
const SERVICE_TIMEOUT = 30000; // 30 seconds

// Initialize extension
chrome.runtime.onInstalled.addListener(() => {
    console.log('Quality Label Printing Service extension installed - Windows Service Mode');
    testServiceConnection();
});

// Test connection to Windows service
async function testServiceConnection() {
    try {
        const response = await fetch(`${PRINT_SERVICE_URL}/health`, { 
            method: 'GET',
            timeout: 5000 
        });
        
        if (response.ok) {
            const data = await response.json();
            console.log('✅ Windows Print Service connected:', data);
            return true;
        } else {
            console.warn('⚠️ Windows Print Service not responding:', response.status);
            return false;
        }
    } catch (error) {
        console.warn('❌ Windows Print Service not available:', error.message);
        return false;
    }
}

// Handle messages from content scripts or web pages  
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
    console.log('Background script received message:', message);
    
    switch (message.action) {
        case 'print_pdf':
            handleWindowsServicePrint(message)
                .then(result => {
                    console.log('Windows service print completed:', result);
                    sendResponse(result);
                })
                .catch(error => {
                    console.error('Windows service print error:', error);
                    sendResponse({ success: false, error: error.message });
                });
            return true; // Keep message channel open for async response
            
        case 'get_printers':
            getAvailablePrinters()
                .then(printers => {
                    sendResponse({ success: true, printers: printers });
                })
                .catch(error => {
                    console.error('Error getting printers:', error);
                    sendResponse({ 
                        success: false, 
                        error: error.message,
                        printers: [{ name: 'default', display_name: 'Default Printer', is_default: true }]
                    });
                });
            return true;
            
        case 'ping':
            testServiceConnection()
                .then(connected => {
                    sendResponse({ 
                        success: true, 
                        extension_version: chrome.runtime.getManifest().version,
                        ready: true,
                        service_connected: connected,
                        mode: 'windows_service'
                    });
                })
                .catch(() => {
                    sendResponse({ 
                        success: true, 
                        extension_version: chrome.runtime.getManifest().version,
                        ready: false,
                        service_connected: false,
                        mode: 'windows_service'
                    });
                });
            return true;
            
        default:
            sendResponse({ error: 'Unknown action', success: false });
    }
});

// Handle external messages from web pages
chrome.runtime.onMessageExternal.addListener((message, sender, sendResponse) => {
    console.log('External message received:', message, 'from:', sender);
    
    // Verify sender origin for security
    const allowedOrigins = [
        'http://localhost:5000',
        'http://localhost:8000',
        'http://127.0.0.1:5000',
        'http://127.0.0.1:8000',
        'http://localhost:3000',
        'http://localhost:8080'
    ];
    
    if (!allowedOrigins.some(origin => sender.url && sender.url.startsWith(origin))) {
        console.warn('Unauthorized origin:', sender.url);
        sendResponse({ error: 'Unauthorized origin', success: false });
        return;
    }
    
    // Handle the message
    switch (message.action) {
        case 'print_pdf':
            handleWindowsServicePrint(message)
                .then(result => sendResponse(result))
                .catch(error => {
                    console.error('Print PDF error:', error);
                    sendResponse({ success: false, error: error.message });
                });
            return true;
            
        case 'ping':
            testServiceConnection()
                .then(connected => {
                    sendResponse({ 
                        success: true, 
                        extension_version: chrome.runtime.getManifest().version,
                        ready: true,
                        service_connected: connected,
                        mode: 'windows_service'
                    });
                })
                .catch(() => {
                    sendResponse({ 
                        success: true, 
                        extension_version: chrome.runtime.getManifest().version,
                        ready: false,
                        service_connected: false,
                        mode: 'windows_service'
                    });
                });
            return true;
            
        default:
            sendResponse({ error: 'Unknown action', success: false });
    }
});

/**
 * Get available printers from Windows service
 */
async function getAvailablePrinters() {
    try {
        const response = await fetch(`${PRINT_SERVICE_URL}/printers`, {
            method: 'GET',
            timeout: 10000
        });
        
        if (response.ok) {
            const data = await response.json();
            return data.printers || [];
        } else {
            throw new Error(`Service responded with status: ${response.status}`);
        }
    } catch (error) {
        console.error('Failed to get printers from service:', error);
        throw error;
    }
}

/**
 * Handle PDF printing via Windows Service
 */
async function handleWindowsServicePrint(message) {
    console.log('🖨️ Sending PDF to Windows print service:', message);
    
    try {
        const { pdfUrl, orderId, prodOrder, quantity, printerName } = message;
        
        if (!pdfUrl) {
            throw new Error('PDF URL is required');
        }

        // First, test if service is available
        const serviceAvailable = await testServiceConnection();
        if (!serviceAvailable) {
            throw new Error('Windows Print Service is not running. Please ensure the service is installed and started.');
        }

        // Prepare print request
        const printRequest = {
            pdf_url: pdfUrl,
            printer_name: printerName || 'default',
            order_id: orderId,
            prod_order: prodOrder,
            quantity: quantity,
            timestamp: new Date().toISOString()
        };

        console.log('📤 Sending print request to service:', printRequest);

        // Send PDF to Windows service for printing
        const response = await fetch(`${PRINT_SERVICE_URL}/print_pdf`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(printRequest)
        });

        if (!response.ok) {
            const errorText = await response.text();
            throw new Error(`Print service error (${response.status}): ${errorText}`);
        }

        const result = await response.json();
        
        if (result.success) {
            console.log('✅ Print job sent successfully:', result);
            
            return {
                success: true,
                message: `PDF sent to ${result.printer || printerName || 'default printer'} successfully`,
                method: result.method || 'Windows Print Service',
                printer: result.printer || printerName,
                orderId: orderId,
                instruction: 'PDF has been sent to the printer queue'
            };
        } else {
            throw new Error(result.error || 'Unknown print service error');
        }

    } catch (error) {
        console.error('❌ Windows service print failed:', error);
        
        // Fallback: Return instruction to print manually
        return {
            success: false,
            error: error.message,
            fallback: true,
            instruction: 'Windows service unavailable. Please download and print the PDF manually.'
        };
    }
}

/**
 * Fallback function for when Windows service is not available
 */
async function handleFallbackPrint(message) {
    console.log('🔄 Using fallback print method:', message);
    
    try {
        const { pdfUrl, orderId, prodOrder, quantity } = message;
        
        // Create a new tab with the PDF
        const tab = await chrome.tabs.create({
            url: pdfUrl,
            active: false  // Don't switch to the tab
        });

        // Wait a moment for PDF to load
        await new Promise(resolve => setTimeout(resolve, 2000));

        // Get the created tab
        const updatedTab = await chrome.tabs.get(tab.id);
        
        return {
            success: true,
            message: `PDF opened in new tab for manual printing`,
            method: 'Manual Print Fallback',
            tabId: tab.id,
            instruction: 'PDF opened in new tab. Use Ctrl+P to print or close the tab if not needed.'
        };

    } catch (error) {
        console.error('❌ Fallback print failed:', error);
        throw error;
    }
}

// Utility functions
function delay(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

// Extension startup
console.log('🖨️ Quality Label Printing Extension loaded - Windows Service Mode');
console.log(`🔗 Service URL: ${PRINT_SERVICE_URL}`);

// Test service on startup
testServiceConnection().then(connected => {
    if (connected) {
        console.log('✅ Windows Print Service is available');
    } else {
        console.log('⚠️ Windows Print Service is not available - fallback mode active');
    }
});

console.log('✅ Background script loaded successfully - Platform safe mode enabled');