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import React, { useState, useRef, useCallback } from 'react';
import './FileUpload.css';
const FileUpload = ({
accept = '*/*',
multiple = false,
maxSize = 10 * 1024 * 1024, // 10MB default
onFileSelect,
onError,
disabled = false,
className = '',
children,
variant = 'default',
...props
}) => {
const [isDragActive, setIsDragActive] = useState(false);
const [files, setFiles] = useState([]);
const fileInputRef = useRef(null);
const validateFile = useCallback((file) => {
if (maxSize && file.size > maxSize) {
return `File size must be less than ${formatFileSize(maxSize)}`;
}
return null;
}, [maxSize]);
const handleFiles = useCallback((fileList) => {
const newFiles = Array.from(fileList);
const validFiles = [];
const errors = [];
newFiles.forEach(file => {
const error = validateFile(file);
if (error) {
errors.push({ file: file.name, error });
} else {
validFiles.push(file);
}
});
if (errors.length > 0 && onError) {
onError(errors);
}
if (validFiles.length > 0) {
const updatedFiles = multiple ? [...files, ...validFiles] : validFiles;
setFiles(updatedFiles);
if (onFileSelect) {
onFileSelect(multiple ? updatedFiles : validFiles[0]);
}
}
}, [files, multiple, onFileSelect, onError, validateFile]);
const handleDragEnter = useCallback((e) => {
e.preventDefault();
e.stopPropagation();
if (!disabled) {
setIsDragActive(true);
}
}, [disabled]);
const handleDragLeave = useCallback((e) => {
e.preventDefault();
e.stopPropagation();
setIsDragActive(false);
}, []);
const handleDragOver = useCallback((e) => {
e.preventDefault();
e.stopPropagation();
}, []);
const handleDrop = useCallback((e) => {
e.preventDefault();
e.stopPropagation();
setIsDragActive(false);
if (disabled) return;
const droppedFiles = e.dataTransfer.files;
if (droppedFiles.length > 0) {
handleFiles(droppedFiles);
}
}, [disabled, handleFiles]);
const handleFileInputChange = useCallback((e) => {
const selectedFiles = e.target.files;
if (selectedFiles && selectedFiles.length > 0) {
handleFiles(selectedFiles);
}
}, [handleFiles]);
const handleClick = useCallback(() => {
if (!disabled && fileInputRef.current) {
fileInputRef.current.click();
}
}, [disabled]);
const removeFile = useCallback((index) => {
const updatedFiles = files.filter((_, i) => i !== index);
setFiles(updatedFiles);
if (onFileSelect) {
onFileSelect(multiple ? updatedFiles : null);
}
}, [files, multiple, onFileSelect]);
const formatFileSize = (bytes) => {
if (bytes === 0) return '0 Bytes';
const k = 1024;
const sizes = ['Bytes', 'KB', 'MB', 'GB'];
const i = Math.floor(Math.log(bytes) / Math.log(k));
return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
};
const baseClasses = 'terra-file-upload';
const variantClasses = `terra-file-upload--${variant}`;
const stateClasses = [
isDragActive && 'terra-file-upload--drag-active',
disabled && 'terra-file-upload--disabled',
files.length > 0 && 'terra-file-upload--has-files'
].filter(Boolean).join(' ');
const uploadClasses = [
baseClasses,
variantClasses,
stateClasses,
className
].filter(Boolean).join(' ');
return (
<div className="terra-file-upload-wrapper">
<div
className={uploadClasses}
onDragEnter={handleDragEnter}
onDragLeave={handleDragLeave}
onDragOver={handleDragOver}
onDrop={handleDrop}
onClick={handleClick}
{...props}
>
<input
ref={fileInputRef}
type="file"
accept={accept}
multiple={multiple}
onChange={handleFileInputChange}
disabled={disabled}
className="terra-file-upload__input"
/>
<div className="terra-file-upload__content">
{children || (
<>
<div className="terra-file-upload__icon">
{isDragActive ? '📤' : '📁'}
</div>
<div className="terra-file-upload__text">
<p className="terra-file-upload__primary">
{isDragActive
? 'Drop files here'
: 'Click to upload or drag and drop'
}
</p>
<p className="terra-file-upload__secondary">
{accept !== '*/*' && `Accepted formats: ${accept}`}
{maxSize && ` • Max size: ${formatFileSize(maxSize)}`}
</p>
</div>
</>
)}
</div>
</div>
{files.length > 0 && (
<div className="terra-file-upload__files">
<h4 className="terra-file-upload__files-title">
Selected Files ({files.length})
</h4>
<div className="terra-file-upload__files-list">
{files.map((file, index) => (
<div key={`${file.name}-${index}`} className="terra-file-upload__file">
<div className="terra-file-upload__file-info">
<span className="terra-file-upload__file-name">{file.name}</span>
<span className="terra-file-upload__file-size">
{formatFileSize(file.size)}
</span>
</div>
<button
type="button"
className="terra-file-upload__file-remove"
onClick={(e) => {
e.stopPropagation();
removeFile(index);
}}
aria-label={`Remove ${file.name}`}
>
✕
</button>
</div>
))}
</div>
</div>
)}
</div>
);
};
export default FileUpload; |