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import React, { useLayoutEffect, useRef, useState } from 'react';
import type { DotType, CornerSquareType, CornerDotType } from 'qr-code-styling';
import type { DetectedLink } from '../lib/platforms';
import { checkQrContrast, MIN_QR_CONTRAST } from '../lib/contrast';
import ColorPicker from './ColorPicker';
export type LogoMode = 'auto' | 'custom' | 'none';
export interface QrStyle {
dotsColor: string;
cornersSquareColor: string;
cornersDotColor: string;
qrBackgroundColor: string;
dotsType: DotType;
cornersSquareType: CornerSquareType;
cornersDotType: CornerDotType;
logoMode: LogoMode;
customLogoDataUrl: string | null;
bgImageDataUrl: string | null;
/** The uploaded photo before cropping, so re-cropping starts from it. */
bgImageSrc: string | null;
bgCropZoom: number;
/** Pan offset normalized to the crop viewport side. */
bgCropOffset: { x: number; y: number };
imageVisibility: number;
}
export const DEFAULT_QR_STYLE: QrStyle = {
dotsColor: '#000000',
cornersSquareColor: '#000000',
cornersDotColor: '#000000',
qrBackgroundColor: '#FFFFFF',
dotsType: 'rounded',
cornersSquareType: 'extra-rounded',
cornersDotType: 'dot',
logoMode: 'auto',
customLogoDataUrl: null,
bgImageDataUrl: null,
bgImageSrc: null,
bgCropZoom: 1,
bgCropOffset: { x: 0, y: 0 },
imageVisibility: 0.45,
};
const DARK_PRESETS = ['#000000', '#1f2937', '#2563eb', '#7c3aed', '#dc2626', '#059669', '#db2777', '#b45309'];
const LIGHT_PRESETS = ['#FFFFFF', '#f1f5f9', '#fef9c3', '#dbeafe', '#dcfce7', '#fce7f3', '#111827', '#000000'];
const DOT_TYPES: { value: DotType; label: string }[] = [
{ value: 'rounded', label: 'Rounded' },
{ value: 'dots', label: 'Dots' },
{ value: 'classy', label: 'Classy' },
{ value: 'classy-rounded', label: 'Classy Round' },
{ value: 'square', label: 'Square' },
{ value: 'extra-rounded', label: 'Extra Round' },
];
const CORNER_SQUARE_TYPES: { value: CornerSquareType; label: string }[] = [
{ value: 'extra-rounded', label: 'Rounded' },
{ value: 'square', label: 'Square' },
{ value: 'dot', label: 'Dot' },
];
const CORNER_DOT_TYPES: { value: CornerDotType; label: string }[] = [
{ value: 'dot', label: 'Dot' },
{ value: 'square', label: 'Square' },
];
const MAX_LOGO_BYTES = 1024 * 1024;
const MAX_BG_DIMENSION = 1024;
const CROP_OUT = 512; // square output the QR pattern is cut from
// Light tints only: the card must keep dark text and QR contrast readable.
const CARD_COLORS: { name: string; value: string | null }[] = [
{ name: 'White', value: null },
{ name: 'Transparent', value: 'transparent' },
{ name: 'Silver', value: 'linear-gradient(135deg, #fdfbfb, #ebedee)' },
{ name: 'Peach Sky', value: 'linear-gradient(135deg, #fff1eb, #ace0f9)' },
{ name: 'Cream', value: 'linear-gradient(135deg, #fefce8, #fde68a)' },
{ name: 'Lavender', value: 'linear-gradient(135deg, #e0c3fc, #8ec5fc)' },
{ name: 'Cloud', value: 'linear-gradient(135deg, #f5f7fa, #c3cfe2)' },
{ name: 'Blush', value: '#fdf2f8' },
{ name: 'Mint', value: '#f0fdf4' },
];
const CARD_IMAGES = [
'/cards/card1.jpg', '/cards/card2.jpg', '/cards/card3.jpg', '/cards/card4.jpg', '/cards/card5.jpg',
'/cards/card6.jpg', '/cards/card7.jpg', '/cards/card8.jpg', '/cards/card9.jpg',
];
interface Gradient { name: string; colors: string[] }
interface SolidColor { name: string; color: string }
interface CustomizePanelProps {
qrStyle: QrStyle;
onStyleChange: (patch: Partial<QrStyle>) => void;
link: DetectedLink;
onClose: () => void;
gradients: Gradient[];
solidColors: SolidColor[];
gradientIndex: number;
customColor: string | null;
onSelectGradient: (index: number) => void;
onSelectSolidColor: (color: string) => void;
cardStyle: 'solid' | 'image';
onSetCardStyle: (style: 'solid' | 'image') => void;
cardBg: string | null;
onSetCardBg: (bg: string | null) => void;
cardImage: string;
onSetCardImage: (url: string) => void;
dockStyle?: React.CSSProperties;
}
type PanelTab = 'colors' | 'shapes' | 'logo' | 'image';
// Very light swatches (e.g. white) need an outline + dark check to be visible
// against the white panel.
function isLightColor(hex: string): boolean {
const m = /^#?([0-9a-f]{6})$/i.exec(hex.trim());
if (!m) return false;
const n = parseInt(m[1], 16);
const r = (n >> 16) & 255;
const g = (n >> 8) & 255;
const b = n & 255;
// Perceived luminance (0–255); above ~230 reads as "near-white".
return 0.299 * r + 0.587 * g + 0.114 * b > 230;
}
function readFileAsDataUrl(file: File): Promise<string> {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => resolve(reader.result as string);
reader.onerror = () => reject(reader.error);
reader.readAsDataURL(file);
});
}
function downscaleImage(dataUrl: string, maxDim: number): Promise<string> {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => {
const scale = Math.min(1, maxDim / Math.max(img.width, img.height));
if (scale >= 1) {
resolve(dataUrl);
return;
}
const canvas = document.createElement('canvas');
canvas.width = Math.round(img.width * scale);
canvas.height = Math.round(img.height * scale);
const ctx = canvas.getContext('2d');
if (!ctx) {
resolve(dataUrl);
return;
}
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
resolve(canvas.toDataURL('image/jpeg', 0.85));
};
img.onerror = () => reject(new Error('Could not load image'));
img.src = dataUrl;
});
}
// Bake the user's zoom/pan into a square image, matching exactly what the
// crop viewport shows: `view` is the on-screen viewport side in px, the image
// is object-fit: cover then scaled by `zoom` and shifted by `offset` px.
function renderCrop(
src: string,
zoom: number,
offset: { x: number; y: number },
view: number,
out: number
): Promise<string> {
return new Promise((resolve, reject) => {
const img = new Image();
img.onload = () => {
const w = img.naturalWidth;
const h = img.naturalHeight;
const canvas = document.createElement('canvas');
canvas.width = out;
canvas.height = out;
const ctx = canvas.getContext('2d');
if (!ctx || !w || !h) {
resolve(src);
return;
}
const cover = Math.max(view / w, view / h);
const displayScale = cover * zoom;
const k = out / view; // viewport px -> output px
const destW = w * displayScale * k;
const destH = h * displayScale * k;
const cx = out / 2 + offset.x * k;
const cy = out / 2 + offset.y * k;
ctx.fillStyle = '#ffffff';
ctx.fillRect(0, 0, out, out);
ctx.drawImage(img, cx - destW / 2, cy - destH / 2, destW, destH);
resolve(canvas.toDataURL('image/jpeg', 0.85));
};
img.onerror = () => reject(new Error('Could not load image'));
img.src = src;
});
}
const CustomizePanel: React.FC<CustomizePanelProps> = ({
qrStyle,
onStyleChange,
link,
onClose,
gradients,
solidColors,
gradientIndex,
customColor,
onSelectGradient,
onSelectSolidColor,
cardStyle,
onSetCardStyle,
cardBg,
onSetCardBg,
cardImage,
onSetCardImage,
dockStyle,
}) => {
const [tab, setTab] = useState<PanelTab>('colors');
const logoInputRef = useRef<HTMLInputElement>(null);
const bgInputRef = useRef<HTMLInputElement>(null);
// Crop / zoom editor for the Image-QR photo
const [cropSrc, setCropSrc] = useState<string | null>(null);
const [cropZoom, setCropZoom] = useState(1);
const [cropOffset, setCropOffset] = useState({ x: 0, y: 0 });
const cropDimsRef = useRef({ w: 0, h: 0 });
const cropViewRef = useRef<HTMLDivElement>(null);
const pendingOffsetRef = useRef({ x: 0, y: 0 });
const dragRef = useRef<{ sx: number; sy: number; ox: number; oy: number } | null>(null);
// Keep the photo covering the frame — no empty gaps at the edges.
const clampOffset = (x: number, y: number, zoom: number, view: number) => {
const { w, h } = cropDimsRef.current;
if (!w || !h) return { x, y };
const displayScale = Math.max(view / w, view / h) * zoom;
const maxX = Math.max(0, (w * displayScale - view) / 2);
const maxY = Math.max(0, (h * displayScale - view) / 2);
return {
x: Math.max(-maxX, Math.min(maxX, x)),
y: Math.max(-maxY, Math.min(maxY, y)),
};
};
const openCrop = (src: string, zoom = 1, normOffset = { x: 0, y: 0 }) => {
cropDimsRef.current = { w: 0, h: 0 };
setCropZoom(zoom);
pendingOffsetRef.current = normOffset;
setCropOffset({ x: 0, y: 0 });
setCropSrc(src);
};
// Restore the saved pan once the crop viewport exists; offsets are stored
// normalized to the viewport side so they survive layout size changes.
useLayoutEffect(() => {
if (!cropSrc) return;
const view = cropViewRef.current?.clientWidth ?? 240;
setCropOffset({
x: pendingOffsetRef.current.x * view,
y: pendingOffsetRef.current.y * view,
});
}, [cropSrc]);
const handleCropZoom = (zoom: number) => {
const view = cropViewRef.current?.clientWidth ?? 240;
setCropZoom(zoom);
setCropOffset((o) => clampOffset(o.x, o.y, zoom, view));
};
const handleCropPointerDown = (e: React.PointerEvent) => {
try {
e.currentTarget.setPointerCapture?.(e.pointerId);
} catch {
// Capture is best-effort; dragging still works without it.
}
dragRef.current = { sx: e.clientX, sy: e.clientY, ox: cropOffset.x, oy: cropOffset.y };
};
const handleCropPointerMove = (e: React.PointerEvent) => {
if (!dragRef.current) return;
const view = cropViewRef.current?.clientWidth ?? 240;
const nx = dragRef.current.ox + (e.clientX - dragRef.current.sx);
const ny = dragRef.current.oy + (e.clientY - dragRef.current.sy);
setCropOffset(clampOffset(nx, ny, cropZoom, view));
};
const handleCropPointerUp = () => {
dragRef.current = null;
};
const applyCrop = async () => {
if (!cropSrc) return;
const view = cropViewRef.current?.clientWidth ?? 240;
try {
const out = await renderCrop(cropSrc, cropZoom, cropOffset, view, CROP_OUT);
onStyleChange({
bgImageDataUrl: out,
bgImageSrc: cropSrc,
bgCropZoom: cropZoom,
bgCropOffset: { x: cropOffset.x / view, y: cropOffset.y / view },
});
} catch {
alert('Could not process that image.');
}
setCropSrc(null);
};
const contrast = checkQrContrast(qrStyle.dotsColor, qrStyle.qrBackgroundColor);
const imageQrActive = Boolean(qrStyle.bgImageDataUrl);
const handleLogoUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
const file = e.target.files?.[0];
e.target.value = '';
if (!file) return;
if (file.size > MAX_LOGO_BYTES) {
alert('Logo image must be under 1 MB.');
return;
}
try {
const dataUrl = await readFileAsDataUrl(file);
onStyleChange({ customLogoDataUrl: dataUrl, logoMode: 'custom' });
} catch {
alert('Could not read that image file.');
}
};
const handleBgUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
const file = e.target.files?.[0];
e.target.value = '';
if (!file) return;
try {
const dataUrl = await readFileAsDataUrl(file);
const scaled = await downscaleImage(dataUrl, MAX_BG_DIMENSION);
openCrop(scaled);
} catch {
alert('Could not read that image file.');
}
};
const colorRow = (
label: string,
value: string,
presets: string[],
apply: (color: string) => void,
disabled = false
) => (
<div className={`qr-color-row${disabled ? ' disabled' : ''}`}>
<span className="qr-color-row-label">{label}</span>
<div className="qr-swatch-row">
{presets.map((color) => (
<button
key={color}
className={`qr-mini-swatch ${value.toLowerCase() === color.toLowerCase() ? 'active' : ''}`}
style={{ background: color }}
onClick={() => apply(color)}
title={color}
disabled={disabled}
/>
))}
<ColorPicker value={value} onChange={apply} disabled={disabled} />
</div>
</div>
);
const shapeRow = <T extends string>(
label: string,
value: T,
options: { value: T; label: string }[],
apply: (v: T) => void
) => (
<div className="qr-color-section">
<h4>{label}</h4>
<div className="qr-shape-grid">
{options.map((opt) => (
<button
key={opt.value}
className={`qr-shape-option ${value === opt.value ? 'active' : ''}`}
onClick={() => apply(opt.value)}
>
{opt.label}
</button>
))}
</div>
</div>
);
return (
<div className="qr-customize-panel" style={dockStyle} onClick={(e) => e.stopPropagation()}>
<div className="qr-color-picker-header">
<h3>Customize</h3>
<button onClick={onClose} className="qr-color-close" aria-label="Close">×</button>
</div>
<div className="qr-tabs">
{([
['colors', 'Colors'],
['shapes', 'Shapes'],
['logo', 'Logo'],
['image', 'Image'],
] as [PanelTab, string][]).map(([id, label]) => (
<button
key={id}
className={`qr-tab ${tab === id ? 'active' : ''}`}
onClick={() => setTab(id)}
>
{label}
</button>
))}
</div>
{tab === 'colors' && (
<>
<div className="qr-color-section">
<h4>QR Code</h4>
{colorRow('Dots', qrStyle.dotsColor, DARK_PRESETS, (c) =>
onStyleChange({ dotsColor: c }), imageQrActive
)}
{colorRow('Corners', qrStyle.cornersSquareColor, DARK_PRESETS, (c) =>
onStyleChange({ cornersSquareColor: c }), imageQrActive
)}
{colorRow('Corner dots', qrStyle.cornersDotColor, DARK_PRESETS, (c) =>
onStyleChange({ cornersDotColor: c }), imageQrActive
)}
{!qrStyle.bgImageDataUrl &&
colorRow('Background', qrStyle.qrBackgroundColor, LIGHT_PRESETS, (c) =>
onStyleChange({ qrBackgroundColor: c })
)}
{imageQrActive && (
<p className="qr-panel-note">
Dot and corner colors are disabled while an image QR is active.
The photo shows through the dark modules, so they stay black to
keep the code scannable.
</p>
)}
</div>
{!qrStyle.bgImageDataUrl &&
!contrast.ok && (
<div className="qr-contrast-warning">
{contrast.inverted
? 'Light dots on a dark background fail in many scanner apps.'
: `Low contrast (${contrast.ratio.toFixed(1)}:1, needs ${MIN_QR_CONTRAST}:1). This QR may not scan reliably.`}
<button
className="qr-contrast-reset"
onClick={() =>
onStyleChange({
dotsColor: '#000000',
cornersSquareColor: '#000000',
cornersDotColor: '#000000',
qrBackgroundColor: '#FFFFFF',
})
}
>
Reset to black & white
</button>
</div>
)}
<div className="qr-color-section">
<h4>Card Style</h4>
<div className="qr-shape-grid qr-shape-grid-2">
<button
className={`qr-shape-option ${cardStyle === 'solid' ? 'active' : ''}`}
onClick={() => onSetCardStyle('solid')}
>
Solid
</button>
<button
className={`qr-shape-option ${cardStyle === 'image' ? 'active' : ''}`}
onClick={() => onSetCardStyle('image')}
>
Image
</button>
</div>
{cardStyle === 'solid' && (
<div className="qr-color-grid" style={{ marginTop: 10 }}>
{CARD_COLORS.map((c) => (
<button
key={c.name}
className={`qr-color-swatch qr-card-swatch ${c.value === 'transparent' ? 'qr-swatch-transparent' : ''} ${cardBg === c.value ? 'active' : ''}`}
style={c.value === 'transparent' ? undefined : { background: c.value ?? '#ffffff' }}
onClick={() => onSetCardBg(c.value)}
title={c.name}
/>
))}
</div>
)}
{cardStyle === 'image' && (
<div className="qr-color-grid" style={{ marginTop: 10 }}>
{CARD_IMAGES.map((src) => (
<button
key={src}
className={`qr-color-swatch qr-card-image-swatch ${cardImage === src ? 'active' : ''}`}
style={{ backgroundImage: `url(${src})` }}
onClick={() => onSetCardImage(src)}
title="Card image"
/>
))}
</div>
)}
</div>
{/* The background sections tint the area behind the card, which only
shows for solid cards — hide them when the card is a photo. */}
{cardStyle !== 'image' && (
<>
<div className="qr-color-section">
<h4>Card Background</h4>
<div className="qr-color-grid">
{gradients.map((gradient, index) => (
<button
key={index}
className={`qr-color-swatch ${gradientIndex === index && !customColor ? 'active' : ''}`}
style={{ background: `linear-gradient(135deg, ${gradient.colors.join(', ')})` }}
onClick={() => onSelectGradient(index)}
title={gradient.name}
/>
))}
</div>
</div>
<div className="qr-color-section">
<h4>Card Solid Colors</h4>
<div className="qr-color-grid">
{solidColors.map((color, index) => (
<button
key={index}
className={`qr-color-swatch ${isLightColor(color.color) ? 'qr-card-swatch' : ''} ${customColor === color.color ? 'active' : ''}`}
style={{ background: color.color }}
onClick={() => onSelectSolidColor(color.color)}
title={color.name}
/>
))}
</div>
</div>
</>
)}
</>
)}
{tab === 'shapes' && (
<>
{shapeRow('Dots', qrStyle.dotsType, DOT_TYPES, (v) => onStyleChange({ dotsType: v }))}
{shapeRow('Corner frames', qrStyle.cornersSquareType, CORNER_SQUARE_TYPES, (v) =>
onStyleChange({ cornersSquareType: v })
)}
{shapeRow('Corner dots', qrStyle.cornersDotType, CORNER_DOT_TYPES, (v) =>
onStyleChange({ cornersDotType: v })
)}
</>
)}
{tab === 'logo' && (
<div className="qr-color-section">
<h4>Center Logo</h4>
<div className="qr-logo-options">
<button
className={`qr-logo-option ${qrStyle.logoMode === 'auto' ? 'active' : ''}`}
onClick={() => onStyleChange({ logoMode: 'auto' })}
>
<img src={link.logoUrl} alt="" className="qr-logo-thumb" />
<span>Auto ({link.platform?.name ?? link.hostname})</span>
</button>
<button
className={`qr-logo-option ${qrStyle.logoMode === 'custom' ? 'active' : ''}`}
onClick={() =>
qrStyle.customLogoDataUrl
? onStyleChange({ logoMode: 'custom' })
: logoInputRef.current?.click()
}
>
{qrStyle.customLogoDataUrl ? (
<img src={qrStyle.customLogoDataUrl} alt="" className="qr-logo-thumb" />
) : (
<span className="qr-logo-thumb qr-logo-thumb-empty">+</span>
)}
<span>Your logo</span>
</button>
<button
className={`qr-logo-option ${qrStyle.logoMode === 'none' ? 'active' : ''}`}
onClick={() => onStyleChange({ logoMode: 'none' })}
>
<span className="qr-logo-thumb qr-logo-thumb-empty">∅</span>
<span>No logo</span>
</button>
</div>
<div className="qr-upload-row">
<button className="qr-upload-btn" onClick={() => logoInputRef.current?.click()}>
{qrStyle.customLogoDataUrl ? 'Replace uploaded logo' : 'Upload a logo'}
</button>
{qrStyle.customLogoDataUrl && (
<button
className="qr-upload-btn danger"
onClick={() => onStyleChange({ customLogoDataUrl: null, logoMode: 'auto' })}
>
Remove
</button>
)}
</div>
<input
ref={logoInputRef}
type="file"
accept="image/png,image/jpeg,image/svg+xml,image/webp"
style={{ display: 'none' }}
onChange={handleLogoUpload}
/>
</div>
)}
{tab === 'image' && (
<div className="qr-color-section">
<h4>Image QR</h4>
{cropSrc ? (
<>
<div
ref={cropViewRef}
className="qr-crop-view"
onPointerDown={handleCropPointerDown}
onPointerMove={handleCropPointerMove}
onPointerUp={handleCropPointerUp}
onPointerCancel={handleCropPointerUp}
>
<img
src={cropSrc}
alt="Crop preview"
className="qr-crop-img"
draggable={false}
style={{ transform: `translate(${cropOffset.x}px, ${cropOffset.y}px) scale(${cropZoom})` }}
onLoad={(e) => {
cropDimsRef.current = {
w: e.currentTarget.naturalWidth,
h: e.currentTarget.naturalHeight,
};
}}
/>
<div className="qr-crop-grid" />
</div>
<div className="qr-slider-row">
<span className="qr-color-row-label">Zoom</span>
<input
type="range"
className="qr-slider"
min={100}
max={300}
value={Math.round(cropZoom * 100)}
onChange={(e) => handleCropZoom(Number(e.target.value) / 100)}
/>
<span className="qr-slider-value">{cropZoom.toFixed(1)}x</span>
</div>
<div className="qr-upload-row">
<button className="qr-upload-btn primary" onClick={applyCrop}>
Apply
</button>
<button className="qr-upload-btn" onClick={() => setCropSrc(null)}>
Cancel
</button>
</div>
<p className="qr-panel-note">Drag to reposition and zoom to fill the frame.</p>
</>
) : qrStyle.bgImageDataUrl ? (
<>
<img src={qrStyle.bgImageDataUrl} alt="Background preview" className="qr-bg-preview" />
<div className="qr-slider-row">
<span className="qr-color-row-label">Visibility</span>
<input
type="range"
className="qr-slider"
min={0}
max={100}
value={Math.round(qrStyle.imageVisibility * 100)}
onChange={(e) =>
onStyleChange({ imageVisibility: Number(e.target.value) / 100 })
}
/>
<span className="qr-slider-value">{Math.round(qrStyle.imageVisibility * 100)}%</span>
</div>
<div className="qr-upload-row">
<button
className="qr-upload-btn"
onClick={() =>
openCrop(
qrStyle.bgImageSrc ?? qrStyle.bgImageDataUrl!,
qrStyle.bgCropZoom,
qrStyle.bgCropOffset
)
}
>
Crop / Zoom
</button>
<button className="qr-upload-btn" onClick={() => bgInputRef.current?.click()}>
Replace
</button>
<button
className="qr-upload-btn danger"
onClick={() =>
onStyleChange({
bgImageDataUrl: null,
bgImageSrc: null,
bgCropZoom: 1,
bgCropOffset: { x: 0, y: 0 },
})
}
>
Remove
</button>
</div>
</>
) : (
<div className="qr-upload-row">
<button className="qr-upload-btn" onClick={() => bgInputRef.current?.click()}>
Upload an image
</button>
</div>
)}
<input
ref={bgInputRef}
type="file"
accept="image/png,image/jpeg,image/webp"
style={{ display: 'none' }}
onChange={handleBgUpload}
/>
</div>
)}
</div>
);
};
export default CustomizePanel;
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