#!/usr/bin/env node

const puppeteer = require('puppeteer');
const path = require('path');
const fs = require('fs');

// Get command line arguments
const args = process.argv.slice(2);
if (args.length < 2) {
    console.error('Usage: node puppeteer_pdf.js <html_file_path> <aspect_ratio>');
    process.exit(1);
}

const htmlFilePath = args[0];
const aspectRatio = args[1];

// Check if HTML file exists
if (!fs.existsSync(htmlFilePath)) {
    console.error(`Error: HTML file not found at ${htmlFilePath}`);
    process.exit(1);
}

// Main conversion function
async function convertToPDF() {
    let browser;
    try {
        console.log('Starting PDF conversion...');
        console.log(`HTML File: ${htmlFilePath}`);
        console.log(`Aspect Ratio: ${aspectRatio}`);
        
        // Get absolute paths
        const absoluteHtmlPath = path.resolve(htmlFilePath);
        const htmlDir = path.dirname(absoluteHtmlPath);
        console.log(`HTML Directory: ${htmlDir}`);
        
        // Read HTML content
        let htmlContent = fs.readFileSync(absoluteHtmlPath, 'utf8');
        
        // List image files in the directory
        const imageFiles = fs.readdirSync(htmlDir).filter(file => 
            /\.(jpg|jpeg|png|gif|svg|webp|bmp)$/i.test(file)
        );
        console.log(`Found ${imageFiles.length} image file(s) in directory:`, imageFiles);
        
        // Launch browser with system Chromium
        const browserOptions = {
            headless: true,
            args: [
                '--no-sandbox',
                '--disable-setuid-sandbox',
                '--disable-dev-shm-usage',
                '--disable-web-security',
                '--disable-features=IsolateOrigins',
                '--disable-site-isolation-trials',
                '--disable-accelerated-2d-canvas',
                '--disable-gpu',
                '--disable-software-rasterizer',
                '--disable-dev-tools',
                '--no-first-run',
                '--no-default-browser-check',
                '--disable-breakpad',
                '--disable-crash-reporter',
                '--no-crashpad',
                '--disable-features=Crashpad',
                '--crash-dumps-dir=/tmp',
                '--disable-component-update'
            ]
        };
        browserOptions.env = {
            ...process.env,
            CHROME_CRASHPAD_PIPE_NAME: 'NONE'
        };

        // Try to use system Chromium if available
        const chromiumPaths = [
            '/usr/bin/chromium',
            '/usr/bin/chromium-browser',
            '/usr/bin/google-chrome',
            '/usr/bin/google-chrome-stable'
        ];

        for (const chromiumPath of chromiumPaths) {
            if (fs.existsSync(chromiumPath)) {
                browserOptions.executablePath = chromiumPath;
                console.log(`Using Chromium at: ${chromiumPath}`);
                break;
            }
        }

        browser = await puppeteer.launch(browserOptions);
        const page = await browser.newPage();
        
        // Set viewport for better rendering based on aspect ratio
        let viewportWidth = 1920;
        let viewportHeight = 1080;
        
        if (aspectRatio === '9:16') {
            viewportWidth = 1080;
            viewportHeight = 1920;
        } else if (aspectRatio === '1:1') {
            viewportWidth = 1080;
            viewportHeight = 1080;
        }
        
        await page.setViewport({
            width: viewportWidth,
            height: viewportHeight,
            deviceScaleFactor: 1  // Changed from 2 to 1 to preserve original sizing
        });
        
        console.log(`Viewport set to: ${viewportWidth}x${viewportHeight}`);
        
        // Construct file:// URL for the HTML directory
        const baseUrl = 'file://' + htmlDir + '/';
        console.log(`Base URL: ${baseUrl}`);
        
        // Load HTML content with file:// protocol
        console.log('Loading HTML content...');
        await page.goto(baseUrl + path.basename(absoluteHtmlPath), {
            waitUntil: ['networkidle0', 'domcontentloaded'],
            timeout: 30000
        });

        // Wait for all images and fonts to load
        console.log('Waiting for images and fonts...');
        await page.evaluate(async () => {
            const selectors = Array.from(document.querySelectorAll("img"));
            console.log('Found', selectors.length, 'img tags');
            
            await Promise.all([
                document.fonts.ready,
                ...selectors.map((img) => {
                    console.log('Image src:', img.src, 'Complete:', img.complete);
                    if (img.complete) return Promise.resolve();
                    return new Promise((resolve) => {
                        img.addEventListener("load", () => {
                            console.log('Loaded:', img.src);
                            resolve();
                        });
                        img.addEventListener("error", () => {
                            console.log('Error loading:', img.src);
                            resolve();
                        });
                        setTimeout(() => {
                            console.log('Timeout:', img.src);
                            resolve();
                        }, 5000);
                    });
                }),
            ]);
        });
        
        // Check which images loaded successfully
        const imageStatus = await page.evaluate(() => {
            const images = Array.from(document.querySelectorAll('img'));
            return images.map(img => ({
                src: img.src,
                complete: img.complete,
                naturalWidth: img.naturalWidth,
                naturalHeight: img.naturalHeight,
                width: img.width,
                height: img.height
            }));
        });
        console.log('Image loading status:', JSON.stringify(imageStatus, null, 2));
        
        // Count pages for logging
        const pageCount = await page.evaluate(() => {
            const pages = document.querySelectorAll('.page, .slide, section.page, article.page');
            return pages.length || 'unknown';
        });
        console.log(`Detected ${pageCount} page element(s) in HTML`);
        
        // Emulate screen media (not print) to preserve CSS
        await page.emulateMediaType('screen');
        
        // Additional wait for rendering and animations
        console.log('Waiting for final render...');
        await new Promise(resolve => setTimeout(resolve, 2000));

        // Generate PDF path
        const pdfPath = htmlFilePath.replace('.html', '.pdf');

        // Configure PDF options based on aspect ratio
        let pdfOptions = {
            path: pdfPath,
            printBackground: true,
            preferCSSPageSize: true,
            margin: { 
                top: '0mm', 
                right: '0mm', 
                bottom: '0mm', 
                left: '0mm' 
            },
            displayHeaderFooter: false,
            scale: 1.0
        };

        // Set dimensions based on aspect ratio
        if (aspectRatio === '16:9') {
            pdfOptions.width = '288mm';
            pdfOptions.height = '162mm';
            pdfOptions.landscape = false;
            console.log('PDF format: Custom 16:9 (288mm x 162mm)');
        } else if (aspectRatio === '1:1') {
            pdfOptions.width = '210mm';
            pdfOptions.height = '210mm';
            pdfOptions.landscape = false;
            console.log('PDF format: Square (210mm x 210mm)');
        } else if (aspectRatio === '9:16') {
            pdfOptions.width = '162mm';
            pdfOptions.height = '288mm';
            pdfOptions.landscape = false;
            console.log('PDF format: Custom 9:16 (162mm x 288mm)');
        } else {
            pdfOptions.width = '297mm';
            pdfOptions.height = '210mm';
            pdfOptions.landscape = true;
            console.log('PDF format: A4 Landscape (default)');
        }

        // Generate the PDF
        console.log('Generating PDF...');
        await page.pdf(pdfOptions);

        // Verify PDF was created
        if (fs.existsSync(pdfPath)) {
            const stats = fs.statSync(pdfPath);
            console.log(`Successfully converted ${htmlFilePath} to ${pdfPath}`);
            console.log(`PDF size: ${(stats.size / 1024).toFixed(2)} KB`);
            process.exit(0);
        } else {
            console.error('PDF file was not created');
            process.exit(1);
        }

    } catch (error) {
        console.error(`PDF conversion failed: ${error.message}`);
        console.error(error.stack);
        process.exit(1);
    } finally {
        if (browser) {
            await browser.close();
        }
    }
}

// Run conversion
convertToPDF().catch(error => {
    console.error('Unhandled error:', error);
    process.exit(1);
});