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document.addEventListener('DOMContentLoaded', function () {
var canvas = document.getElementById('preview-canvas');
if (!canvas) return;
var ctx = canvas.getContext('2d');
var video = document.getElementById('webcam-video');
var btnCapture = document.getElementById('btn-capture');
var btnSave = document.getElementById('btn-save');
var fileInput = document.getElementById('file-input');
var scaleSlider = document.getElementById('overlay-scale');
var tabWebcam = document.getElementById('tab-webcam');
var tabUpload = document.getElementById('tab-upload');
var webcamPanel = document.getElementById('webcam-panel');
var uploadPanel = document.getElementById('upload-panel');
var csrfToken = document.getElementById('csrf-token').value;
var overlayThumbs = document.querySelectorAll('.overlay-thumb');
// State
var baseImageData = null; // base64 data URL of the captured/uploaded image
var selectedOverlay = null; // filename of the selected overlay
var overlayImg = null; // loaded Image object for the selected overlay
var webcamStream = null;
// -- Tabs --
tabWebcam.addEventListener('click', function () {
tabWebcam.classList.add('active');
tabUpload.classList.remove('active');
webcamPanel.hidden = false;
uploadPanel.hidden = true;
startWebcam();
});
tabUpload.addEventListener('click', function () {
tabUpload.classList.add('active');
tabWebcam.classList.remove('active');
uploadPanel.hidden = false;
webcamPanel.hidden = true;
stopWebcam();
});
// -- Webcam --
function startWebcam() {
if (webcamStream) return;
navigator.mediaDevices.getUserMedia({ video: { width: 640, height: 640, facingMode: 'user' } })
.then(function (stream) {
webcamStream = stream;
video.srcObject = stream;
})
.catch(function () {
// Camera not available — switch to upload tab
tabUpload.click();
});
}
function stopWebcam() {
if (webcamStream) {
webcamStream.getTracks().forEach(function (t) { t.stop(); });
webcamStream = null;
video.srcObject = null;
}
}
btnCapture.addEventListener('click', function () {
// Draw current video frame onto an offscreen canvas to get a data URL
var offscreen = document.createElement('canvas');
offscreen.width = 640;
offscreen.height = 640;
var offCtx = offscreen.getContext('2d');
// Center-crop the video frame into the square canvas
var vw = video.videoWidth;
var vh = video.videoHeight;
var crop = Math.min(vw, vh);
var sx = (vw - crop) / 2;
var sy = (vh - crop) / 2;
offCtx.drawImage(video, sx, sy, crop, crop, 0, 0, 640, 640);
baseImageData = offscreen.toDataURL('image/jpeg', 0.9);
renderPreview();
});
// -- Upload --
fileInput.addEventListener('change', function () {
var file = fileInput.files[0];
if (!file) return;
var reader = new FileReader();
reader.onload = function (e) {
baseImageData = e.target.result;
renderPreview();
};
reader.readAsDataURL(file);
});
// -- Overlay selection --
overlayThumbs.forEach(function (thumb) {
thumb.addEventListener('click', function () {
// Deselect previous
overlayThumbs.forEach(function (t) { t.classList.remove('selected'); });
thumb.classList.add('selected');
selectedOverlay = thumb.dataset.filename;
// Preload the full overlay image for canvas rendering
overlayImg = new Image();
overlayImg.onload = renderPreview;
overlayImg.src = thumb.src;
});
});
// -- Scale slider --
scaleSlider.addEventListener('input', renderPreview);
// -- Preview --
function renderPreview() {
ctx.clearRect(0, 0, 640, 640);
// Fill with light gray so the canvas isn't transparent
ctx.fillStyle = '#eee';
ctx.fillRect(0, 0, 640, 640);
if (!baseImageData) {
ctx.fillStyle = '#999';
ctx.font = '18px sans-serif';
ctx.textAlign = 'center';
ctx.fillText('Take a photo or upload an image', 320, 320);
updateSaveButton();
return;
}
var img = new Image();
img.onload = function () {
// Center-crop into the 640x640 canvas
var sw = img.width;
var sh = img.height;
var crop = Math.min(sw, sh);
var sx = (sw - crop) / 2;
var sy = (sh - crop) / 2;
ctx.drawImage(img, sx, sy, crop, crop, 0, 0, 640, 640);
// Draw overlay on top if one is selected
if (overlayImg && overlayImg.complete) {
var scale = scaleSlider.value / 100;
var ow = overlayImg.width * scale;
var oh = overlayImg.height * scale;
var ox = (640 - ow) / 2;
var oy = (640 - oh) / 2;
ctx.drawImage(overlayImg, ox, oy, ow, oh);
}
updateSaveButton();
};
img.src = baseImageData;
}
function updateSaveButton() {
// Both a base image and an overlay must be selected
btnSave.disabled = !(baseImageData && selectedOverlay);
}
// -- Save --
btnSave.addEventListener('click', function () {
if (btnSave.disabled) return;
btnSave.disabled = true;
btnSave.textContent = 'Saving...';
var scale = scaleSlider.value / 100;
fetch('/editor', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
image_data: baseImageData,
overlay: selectedOverlay,
overlay_scale: scale,
csrf_token: csrfToken
})
})
.then(function (res) { return res.json(); })
.then(function (data) {
if (data.success) {
window.location.href = data.redirect;
} else {
alert(data.error || 'Something went wrong.');
btnSave.disabled = false;
btnSave.textContent = 'Save post';
}
})
.catch(function () {
alert('Network error. Please try again.');
btnSave.disabled = false;
btnSave.textContent = 'Save post';
});
});
// Start webcam by default
startWebcam();
renderPreview();
});
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