/**
 * SAM_ERP Storyboard HTML to PPTX Converter (Hybrid Approach)
 *
 * - Simple slides: Extracted as editable elements using html2pptx.js
 * - Complex slides (tables, etc.): Captured as high-resolution images
 */

const PptxGenJS = require('pptxgenjs');
const html2pptx = require('./html2pptx.js');
const { chromium } = require('playwright');
const path = require('path');
const fs = require('fs');

async function convert() {
    console.log('SAM_ERP Storyboard HTML to PPTX Conversion (Hybrid)');
    console.log('====================================================\n');

    // Create new presentation
    const pres = new PptxGenJS();

    // Set presentation properties (720pt x 405pt = 10" x 5.625")
    pres.defineLayout({ name: 'CUSTOM', width: 10, height: 5.625 });
    pres.layout = 'CUSTOM';
    pres.title = 'SAM_ERP Storyboard';
    pres.author = 'CODE-BRIDGE X';
    pres.subject = 'SAM ERP System Storyboard';

    // Get all HTML slide files
    const slidesDir = path.join(__dirname, 'slides');
    const imagesDir = path.join(__dirname, 'slide-images');

    if (!fs.existsSync(imagesDir)) {
        fs.mkdirSync(imagesDir, { recursive: true });
    }

    const slideFiles = fs.readdirSync(slidesDir)
        .filter(f => f.endsWith('.html'))
        .sort();

    console.log(`Found ${slideFiles.length} slides to convert:\n`);

    // Launch browser for fallback screenshots
    const browser = await chromium.launch();
    const context = await browser.newContext({
        viewport: { width: 960, height: 540 }
    });
    const page = await context.newPage();

    let editableCount = 0;
    let imageCount = 0;

    // Convert each slide
    for (let i = 0; i < slideFiles.length; i++) {
        const slideFile = slideFiles[i];
        const slidePath = path.join(slidesDir, slideFile);
        const imagePath = path.join(imagesDir, `slide-${String(i + 1).padStart(2, '0')}.png`);

        console.log(`  [${i + 1}/${slideFiles.length}] ${slideFile}`);

        try {
            // Try editable conversion first
            await html2pptx(slidePath, pres);
            console.log(`    ✓ Editable (elements extracted)`);
            editableCount++;
        } catch (err) {
            // Fallback to image capture
            console.log(`    → Falling back to image capture...`);
            try {
                await page.goto(`file:///${slidePath.replace(/\\/g, '/')}`);
                await page.waitForLoadState('networkidle');

                await page.screenshot({
                    path: imagePath,
                    fullPage: false,
                    clip: { x: 0, y: 0, width: 960, height: 540 }
                });

                const slide = pres.addSlide();
                slide.addImage({
                    path: imagePath,
                    x: 0,
                    y: 0,
                    w: 10,
                    h: 5.625
                });

                console.log(`    ✓ Image (screenshot captured)`);
                imageCount++;
            } catch (imgErr) {
                console.error(`    ✗ Failed: ${imgErr.message}`);
            }
        }
    }

    await browser.close();

    // Save to pptx folder
    const outputDir = path.join(__dirname, 'pptx');
    if (!fs.existsSync(outputDir)) {
        fs.mkdirSync(outputDir, { recursive: true });
    }

    const outputPath = path.join(outputDir, 'SAM_ERP_Storyboard_Hybrid.pptx');

    console.log('\nSaving presentation...');
    await pres.writeFile({ fileName: outputPath });

    console.log(`\n✓ Successfully created: ${outputPath}`);
    console.log(`  Total slides: ${slideFiles.length}`);
    console.log(`  Editable slides: ${editableCount}`);
    console.log(`  Image slides: ${imageCount}`);
}

convert().catch(err => {
    console.error('Conversion failed:', err);
    process.exit(1);
});