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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>PDF Slide Viewer</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.16.105/pdf.min.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            font-family: Arial, sans-serif;
            background-color: #000;
            color: #fff;
            position: relative;
        }
        canvas {
            display: block;
            margin: 0 auto;
            width: 100vw;
            height: 100vh;
            object-fit: contain;
            cursor: crosshair;
        }
        .arrow-button {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background-color: rgba(0, 0, 0, 0.5);
            color: #fff;
            border: none;
            font-size: 24px;
            padding: 10px;
            cursor: pointer;
            z-index: 10;
        }
        .arrow-button:disabled {
            cursor: not-allowed;
            background-color: rgba(100, 100, 100, 0.5);
        }
        #prev-slide {
            left: 10px;
        }
        #next-slide {
            right: 10px;
        }
        .links-container {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .link-button {
            padding: 10px 15px;
            background-color: #1a73e8;
            color: #fff;
            text-decoration: none;
            font-size: 14px;
            border-radius: 5px;
            border: none;
            cursor: pointer;
        }
        .link-button:hover {
            background-color: #1558b8;
        }
        .toolbar {
            position: absolute;
            top: 20px;
            left: 10px;
            z-index: 10;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .toolbar button {
            width: 30px;
            height: 30px;
            font-size: 16px;
            cursor: pointer;
            border: none;
            border-radius: 50%;
            background-color: #444;
            color: #fff;
            text-align: center;
        }
        .toolbar button.active {
            background-color: #1a73e8;
        }
        .color-button {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: 2px solid #fff;
            cursor: pointer;
        }
        .color-button.red {
            background-color: red;
        }
        .color-button.green {
            background-color: green;
        }
        .color-button.blue {
            background-color: blue;
        }
        .color-button.yellow {
            background-color: yellow;
        }
        .slider-container {
            position: absolute;
            bottom: 20px;
            left: 10px;
            display: flex;
            flex-direction: column;
            align-items: center;
            z-index: 10;
        }
        #page-slider {
            width: 200px;
        }
        #page-number-input {
            margin-top: 10px;
            width: 60px;
            text-align: center;
            font-size: 16px;
        }
        .flash-message {
            position: absolute;
            top: 10px;
            left: 50%;
            transform: translateX(-50%);
            background-color: red;
            color: white;
            padding: 5px 10px;
            border-radius: 5px;
            font-size: 14px;
            display: none;
            z-index: 10;
        }
        /* Add styles for full-screen button */
        #fullscreen-btn {
            position: absolute;
            top: 20px;
            right: 10px;
            z-index: 10;
            background-color: #444;
            color: #fff;
            border: none;
            font-size: 16px;
            padding: 10px;
            cursor: pointer;
            border-radius: 5px;
        }
        #fullscreen-btn:hover {
            background-color: #1a73e8;
        }
    </style>
</head>
<body>
    <canvas id="pdf-canvas"></canvas>
    <button id="prev-slide" class="arrow-button">&#8249;</button>
    <button id="next-slide" class="arrow-button">&#8250;</button>
    <div id="links-container" class="links-container"></div>
    <div class="toolbar">
        <button id="toggle-draw" class="color-button">D</button>
        <button id="clear-draw" class="color-button">E</button>
        <button class="color-button red" data-color="red"></button>
        <button class="color-button green" data-color="green"></button>
        <button class="color-button blue" data-color="blue"></button>
        <button class="color-button yellow" data-color="yellow"></button>
    </div>
    <div class="slider-container">
        <input type="range" id="page-slider" min="1" max="1" value="1">
        <input type="number" id="page-number-input" min="1" value="1">
    </div>
    <div id="flash-message" class="flash-message">Invalid Page Number!</div>
    <button id="fullscreen-btn">Full Screen</button>
    <script>
        const pdfUrl = 'mypdf.pdf'; // Replace with the path to your PDF file

        const pdfCanvas = document.getElementById('pdf-canvas');
        const ctx = pdfCanvas.getContext('2d');
        const prevSlideBtn = document.getElementById('prev-slide');
        const nextSlideBtn = document.getElementById('next-slide');
        const linksContainer = document.getElementById('links-container');
        const toggleDrawBtn = document.getElementById('toggle-draw');
        const clearDrawBtn = document.getElementById('clear-draw');
        const colorButtons = document.querySelectorAll('.color-button');
        const pageSlider = document.getElementById('page-slider');
        const pageNumberInput = document.getElementById('page-number-input');
        const flashMessage = document.getElementById('flash-message');
        // Get the toolbar (drawing tools) element for toggling visibility
        const toolbar = document.querySelector('.toolbar');

        let pdfDoc = null;
        let currentPage = 1;
        let totalPages = 0;
        let isDrawing = false;
        let drawMode = false;
        let drawColor = 'red'; // Default drawing color

        function clearLinks() {
            linksContainer.innerHTML = '';
        }

        async function renderPage(pageNumber) {
            const page = await pdfDoc.getPage(pageNumber);

            const viewport = page.getViewport({ scale: 2 });
            pdfCanvas.width = viewport.width;
            pdfCanvas.height = viewport.height;

            const renderContext = {
                canvasContext: ctx,
                viewport: viewport,
                enableWebGL: true
            };

            ctx.clearRect(0, 0, pdfCanvas.width, pdfCanvas.height);
            clearLinks();
            await page.render(renderContext).promise;

            const annotations = await page.getAnnotations();
            annotations.forEach(annotation => {
                if (annotation.url) {
                    const linkButton = document.createElement('a');
                    linkButton.href = annotation.url;
                    linkButton.target = '_blank';
                    linkButton.className = 'link-button';
                    linkButton.textContent = annotation.title || annotation.url;
                    linksContainer.appendChild(linkButton);
                }
            });

            prevSlideBtn.disabled = currentPage === 1;
            nextSlideBtn.disabled = currentPage === totalPages;
        }

        async function loadPdf() {
            pdfDoc = await pdfjsLib.getDocument(pdfUrl).promise;
            totalPages = pdfDoc.numPages;
            pageSlider.max = totalPages;
            renderPage(currentPage);
        }

        function showFlashMessage() {
            flashMessage.style.display = 'block';
            setTimeout(() => {
                flashMessage.style.display = 'none';
            }, 2000);
        }

        // Keyboard events
        document.addEventListener('keydown', (event) => {
            switch (event.key) {
                case 'ArrowLeft':
                    if (currentPage > 1) {
                        currentPage--;
                        pageSlider.value = currentPage;
                        pageNumberInput.value = currentPage;
                        renderPage(currentPage);
                    }
                    break;
                case 'ArrowRight':
                    if (currentPage < totalPages) {
                        currentPage++;
                        pageSlider.value = currentPage;
                        pageNumberInput.value = currentPage;
                        renderPage(currentPage);
                    }
                    break;
                case 'd':
                    drawMode = true;
                    toggleDrawBtn.classList.add('active');
                    break;
                case 's':
                    drawMode = false;
                    toggleDrawBtn.classList.remove('active');
                    break;
                case 'e':
                    ctx.clearRect(0, 0, pdfCanvas.width, pdfCanvas.height);
                    renderPage(currentPage);
                    break;
                case 'r':
                    drawColor = 'red';
                    break;
                case 'g':
                    drawColor = 'green';
                    break;
                case 'b':
                    drawColor = 'blue';
                    break;
                case 'y':
                    drawColor = 'yellow';
                    break;
                case 'h':
                    // Toggle the display of the toolbar (drawing tools)
                    if (toolbar.style.display === 'none') {
                        toolbar.style.display = 'flex';
                    } else {
                        toolbar.style.display = 'none';
                    }
                    break;
            }
        });

        // Arrow button click events to change slides
        prevSlideBtn.addEventListener('click', () => {
            if (currentPage > 1) {
                currentPage--;
                pageSlider.value = currentPage;
                pageNumberInput.value = currentPage;
                renderPage(currentPage);
            }
        });

        nextSlideBtn.addEventListener('click', () => {
            if (currentPage < totalPages) {
                currentPage++;
                pageSlider.value = currentPage;
                pageNumberInput.value = currentPage;
                renderPage(currentPage);
            }
        });

        // Slider and number input events
        pageSlider.addEventListener('input', (event) => {
            currentPage = parseInt(event.target.value);
            pageNumberInput.value = currentPage;
            renderPage(currentPage);
        });

        pageNumberInput.addEventListener('change', (event) => {
            const page = parseInt(event.target.value);
            if (page >= 1 && page <= totalPages) {
                currentPage = page;
                pageSlider.value = currentPage;
                renderPage(currentPage);
            } else {
                showFlashMessage();
            }
        });

        // ---- CHANGES START HERE: Scale mouse coordinates to match canvas's internal dimensions ----
        pdfCanvas.addEventListener('mousedown', (e) => {
            if (!drawMode) return;
            isDrawing = true;
            const rect = pdfCanvas.getBoundingClientRect();
            const scaleX = pdfCanvas.width / rect.width;
            const scaleY = pdfCanvas.height / rect.height;
            const x = (e.clientX - rect.left) * scaleX;
            const y = (e.clientY - rect.top) * scaleY;
            ctx.beginPath();
            ctx.moveTo(x, y);
        });

        pdfCanvas.addEventListener('mousemove', (e) => {
            if (!isDrawing || !drawMode) return;
            const rect = pdfCanvas.getBoundingClientRect();
            const scaleX = pdfCanvas.width / rect.width;
            const scaleY = pdfCanvas.height / rect.height;
            const x = (e.clientX - rect.left) * scaleX;
            const y = (e.clientY - rect.top) * scaleY;
            ctx.lineTo(x, y);
            ctx.strokeStyle = drawColor;
            ctx.lineWidth = 2;
            ctx.stroke();
        });

        pdfCanvas.addEventListener('mouseup', () => {
            if (!drawMode) return;
            isDrawing = false;
            ctx.closePath();
        });
        // ---- CHANGES END HERE ----

        loadPdf().catch(error => {
            console.error('Error loading PDF:', error);
            alert('Failed to load PDF. Please check the file path.');
        });

        // Fullscreen functionality
        document.getElementById('fullscreen-btn').addEventListener('click', () => {
            if (!document.fullscreenElement) {
                document.documentElement.requestFullscreen();
            } else {
                if (document.exitFullscreen) {
                    document.exitFullscreen();
                }
            }
        });
    </script>
</body>
</html>