feat: import snippets

config/webpack-js.ts

@@ -26,6 +26,7 @@ export const jsWebpackConfig: Configuration = {
 	entry: {
 		edit: { import: `${SOURCE_DIR}/edit.tsx`, dependOn: 'editor' },
 		editor: `${SOURCE_DIR}/editor.ts`,
+		import: `${SOURCE_DIR}/import.tsx`,
 		manage: `${SOURCE_DIR}/manage.ts`,
 		mce: `${SOURCE_DIR}/mce.ts`,
 		prism: `${SOURCE_DIR}/prism.ts`,

src/js/components/Import/FromFileUpload/FileUploadForm.tsx

@@ -0,0 +1,201 @@
+import React, { useState, useRef, useEffect } from 'react'
+import { __ } from '@wordpress/i18n'
+import { Button } from '../../common/Button'
+import {
+	DuplicateActionSelector,
+	DragDropUploadArea,
+	SelectedFilesList,
+	SnippetSelectionTable,
+	ImportResultDisplay
+} from './components'
+import { ImportCard } from '../shared'
+import {
+	useFileSelection,
+	useSnippetSelection,
+	useImportWorkflow
+} from './hooks'
+
+type DuplicateAction = 'ignore' | 'replace' | 'skip'
+type Step = 'upload' | 'select'
+
+export const FileUploadForm: React.FC = () => {
+	const [duplicateAction, setDuplicateAction] = useState<DuplicateAction>('ignore')
+	const [currentStep, setCurrentStep] = useState<Step>('upload')
+	const selectSectionRef = useRef<HTMLDivElement>(null)
+
+	const fileSelection = useFileSelection()
+	const importWorkflow = useImportWorkflow()
+	const snippetSelection = useSnippetSelection(importWorkflow.availableSnippets)
+
+	useEffect(() => {
+		if (currentStep === 'select' && selectSectionRef.current) {
+			selectSectionRef.current.scrollIntoView({ 
+				behavior: 'smooth', 
+				block: 'start' 
+			})
+		}
+	}, [currentStep])
+
+	const handleFileSelect = (files: FileList | null) => {
+		fileSelection.handleFileSelect(files)
+		importWorkflow.clearUploadResult()
+	}
+
+	const handleParseFiles = async () => {
+		if (!fileSelection.selectedFiles) return
+
+		const success = await importWorkflow.parseFiles(fileSelection.selectedFiles)
+		if (success) {
+			snippetSelection.clearSelection()
+			setCurrentStep('select')
+		}
+	}
+
+	const handleImportSelected = async () => {
+		const snippetsToImport = snippetSelection.getSelectedSnippets()
+		await importWorkflow.importSnippets(snippetsToImport, duplicateAction)
+	}
+
+	const handleBackToUpload = () => {
+		setCurrentStep('upload')
+		fileSelection.clearFiles()
+		snippetSelection.clearSelection()
+		importWorkflow.resetWorkflow()
+	}
+
+	const isUploadDisabled = !fileSelection.selectedFiles || 
+							 fileSelection.selectedFiles.length === 0 || 
+							 importWorkflow.isUploading
+
+	const isImportDisabled = snippetSelection.selectedSnippets.size === 0 || 
+							 importWorkflow.isImporting
+
+	return (
+		<div className="wrap">
+			<div className="import-form-container" style={{ maxWidth: '800px' }}>
+				<p>{__('Upload one or more Code Snippets export files and the snippets will be imported.', 'code-snippets')}</p>
+
+				<p>
+					{__('Afterward, you will need to visit the ', 'code-snippets')}
+					<a href="admin.php?page=snippets">
+						{__('All Snippets', 'code-snippets')}
+					</a>
+					{__(' page to activate the imported snippets.', 'code-snippets')}
+				</p>
+
+				{currentStep === 'upload' && (
+					<>
+
+						{(!importWorkflow.uploadResult || !importWorkflow.uploadResult.success) && (
+							<>
+								<DuplicateActionSelector
+									value={duplicateAction}
+									onChange={setDuplicateAction}
+								/>
+
+								<ImportCard>
+									<h2 style={{ margin: '0 0 1em 0' }}>{__('Choose Files', 'code-snippets')}</h2>
+									<p className="description" style={{ marginBottom: '1em' }}>
+										{__('Choose one or more Code Snippets (.xml or .json) files to parse and preview.', 'code-snippets')}
+									</p>
+
+									<DragDropUploadArea
+										fileInputRef={fileSelection.fileInputRef}
+										onFileSelect={handleFileSelect}
+										disabled={importWorkflow.isUploading}
+									/>
+
+									{fileSelection.selectedFiles && fileSelection.selectedFiles.length > 0 && (
+										<SelectedFilesList
+											files={fileSelection.selectedFiles}
+											onRemoveFile={fileSelection.removeFile}
+										/>
+									)}
+
+									<div style={{ textAlign: 'center' }}>
+										<Button
+											primary
+											onClick={handleParseFiles}
+											disabled={isUploadDisabled}
+											style={{ minWidth: '200px' }}
+										>
+											{importWorkflow.isUploading 
+												? __('Uploading files...', 'code-snippets')
+												: __('Upload files', 'code-snippets')
+											}
+										</Button>
+									</div>
+								</ImportCard>
+							</>
+						)}
+					</>
+				)}
+
+				{currentStep === 'select' && importWorkflow.availableSnippets.length > 0 && !importWorkflow.uploadResult?.success && (
+					<ImportCard ref={selectSectionRef}>
+						<div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', marginBottom: '20px' }}>
+							<Button onClick={handleBackToUpload} className="button-link">
+								{__('← Upload Different Files', 'code-snippets')}
+							</Button>
+						</div>
+						<div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '10px' }}>
+							<div>
+								<h3 style={{ margin: '0' }}>{__('Available Snippets', 'code-snippets')} ({importWorkflow.availableSnippets.length})</h3>
+								<p style={{ margin: '0.5em 0 1em 0', color: '#666' }}>
+									{__('Select the snippets you want to import:', 'code-snippets')}
+								</p>
+							</div>
+							<div>
+								<Button onClick={snippetSelection.handleSelectAll} style={{ marginRight: '10px' }}>
+									{snippetSelection.isAllSelected 
+										? __('Deselect All', 'code-snippets')
+										: __('Select All', 'code-snippets')
+									}
+								</Button>
+								<Button 
+									primary
+									onClick={handleImportSelected}
+									disabled={isImportDisabled}
+								>
+									{importWorkflow.isImporting 
+										? __('Importing...', 'code-snippets')
+										: __('Import Selected', 'code-snippets')} ({snippetSelection.selectedSnippets.size})
+								</Button>
+							</div>
+						</div>
+
+						<SnippetSelectionTable
+							snippets={importWorkflow.availableSnippets}
+							selectedSnippets={snippetSelection.selectedSnippets}
+							isAllSelected={snippetSelection.isAllSelected}
+							onSnippetToggle={snippetSelection.handleSnippetToggle}
+							onSelectAll={snippetSelection.handleSelectAll}
+						/>
+
+						<div style={{ textAlign: 'end', marginTop: '1em' }}>
+							<Button onClick={snippetSelection.handleSelectAll} style={{ marginRight: '10px' }}>
+								{snippetSelection.isAllSelected 
+									? __('Deselect All', 'code-snippets')
+									: __('Select All', 'code-snippets')
+								}
+							</Button>
+							<Button 
+								primary
+								onClick={handleImportSelected}
+								disabled={isImportDisabled}
+							>
+								{importWorkflow.isImporting 
+									? __('Importing...', 'code-snippets')
+									: __('Import Selected', 'code-snippets')} ({snippetSelection.selectedSnippets.size})
+							</Button>
+						</div>
+					</ImportCard>
+				)}
+
+				{importWorkflow.uploadResult && (
+					<ImportResultDisplay result={importWorkflow.uploadResult} />
+				)}
+			</div>
+		</div>
+	)
+}

src/js/components/Import/FromFileUpload/components/DragDropUploadArea.tsx

@@ -0,0 +1,66 @@
+import React from 'react'
+import { __ } from '@wordpress/i18n'
+import { useDragAndDrop } from '../hooks/useDragAndDrop'
+
+interface DragDropUploadAreaProps {
+	fileInputRef: React.RefObject<HTMLInputElement>
+	onFileSelect: (files: FileList | null) => void
+	disabled?: boolean
+}
+
+export const DragDropUploadArea: React.FC<DragDropUploadAreaProps> = ({
+	fileInputRef,
+	onFileSelect,
+	disabled = false
+}) => {
+	const { dragOver, handleDragOver, handleDragLeave, handleDrop } = useDragAndDrop({
+		onFilesDrop: onFileSelect
+	})
+
+	const handleClick = () => {
+		if (!disabled) {
+			fileInputRef.current?.click()
+		}
+	}
+
+	return (
+		<>
+			<div
+				className={`upload-drop-zone ${dragOver ? 'drag-over' : ''}`}
+				onDragOver={handleDragOver}
+				onDragLeave={handleDragLeave}
+				onDrop={handleDrop}
+				onClick={handleClick}
+				style={{
+					border: `2px dashed ${dragOver ? '#0073aa' : '#ccd0d4'}`,
+					borderRadius: '4px',
+					padding: '40px 20px',
+					textAlign: 'center',
+					cursor: disabled ? 'not-allowed' : 'pointer',
+					backgroundColor: dragOver ? '#f0f6fc' : disabled ? '#f6f7f7' : '#fafafa',
+					marginBottom: '20px',
+					transition: 'all 0.3s ease',
+					opacity: disabled ? 0.6 : 1
+				}}
+			>
+				<div style={{ fontSize: '48px', marginBottom: '10px', color: '#666' }}>📁</div>
+				<p style={{ margin: '0 0 8px 0', fontSize: '16px', fontWeight: '500' }}>
+					{__('Drag and drop files here, or click to browse', 'code-snippets')}
+				</p>
+				<p style={{ margin: '0', color: '#666', fontSize: '14px' }}>
+					{__('Supports JSON and XML files', 'code-snippets')}
+				</p>
+			</div>
+
+			<input
+				ref={fileInputRef}
+				type="file"
+				accept="application/json,.json,text/xml"
+				multiple
+				onChange={(e) => onFileSelect(e.target.files)}
+				style={{ display: 'none' }}
+				disabled={disabled}
+			/>
+		</>
+	)
+}

src/js/components/Import/FromFileUpload/components/DuplicateActionSelector.tsx

@@ -0,0 +1,70 @@
+import React from 'react'
+import { __ } from '@wordpress/i18n'
+import { ImportCard } from '../../shared'
+
+type DuplicateAction = 'ignore' | 'replace' | 'skip'
+
+interface DuplicateActionSelectorProps {
+	value: DuplicateAction
+	onChange: (action: DuplicateAction) => void
+}
+
+export const DuplicateActionSelector: React.FC<DuplicateActionSelectorProps> = ({
+	value,
+	onChange
+}) => {
+	return (
+		<ImportCard>
+			<h2 style={{ margin: '0 0 1em 0' }}>{__('Duplicate Snippets', 'code-snippets')}</h2>
+			<p className="description" style={{ marginBottom: '1em' }}>
+				{__('What should happen if an existing snippet is found with an identical name to an imported snippet?', 'code-snippets')}
+			</p>
+
+			<fieldset>
+				<div style={{ display: 'flex', flexDirection: 'column', gap: '8px' }}>
+					<label style={{ display: 'flex', alignItems: 'flex-start', gap: '8px', cursor: 'pointer' }}>
+						<input
+							type="radio"
+							name="duplicate_action"
+							value="ignore"
+							checked={value === 'ignore'}
+							onChange={(e) => onChange(e.target.value as DuplicateAction)}
+							style={{ marginTop: '2px' }}
+						/>
+						<span>
+							{__('Ignore any duplicate snippets: import all snippets from the file regardless and leave all existing snippets unchanged.', 'code-snippets')}
+						</span>
+					</label>
+
+					<label style={{ display: 'flex', alignItems: 'flex-start', gap: '8px', cursor: 'pointer' }}>
+						<input
+							type="radio"
+							name="duplicate_action"
+							value="replace"
+							checked={value === 'replace'}
+							onChange={(e) => onChange(e.target.value as DuplicateAction)}
+							style={{ marginTop: '2px' }}
+						/>
+						<span>
+							{__('Replace any existing snippets with a newly imported snippet of the same name.', 'code-snippets')}
+						</span>
+					</label>
+
+					<label style={{ display: 'flex', alignItems: 'flex-start', gap: '8px', cursor: 'pointer' }}>
+						<input
+							type="radio"
+							name="duplicate_action"
+							value="skip"
+							checked={value === 'skip'}
+							onChange={(e) => onChange(e.target.value as DuplicateAction)}
+							style={{ marginTop: '2px' }}
+						/>
+						<span>
+							{__('Do not import any duplicate snippets; leave all existing snippets unchanged.', 'code-snippets')}
+						</span>
+					</label>
+				</div>
+			</fieldset>
+		</ImportCard>
+	)
+}