/**
 * UploadManager - Refactored with simplified store architecture
 *
 * Architecture:
 * - uploadStore: Individual uploads with blob data, keyed by uploadId
 * - groupStore: Group metadata + upload references, keyed by groupId
 * - Runtime Maps: DOM references only (fieldElements, uploadElements, groupElements)
 *
 * Flow: File → Process → Store → Queue → Server → Clear stores
 * Recovery: Check stores on load → Show notification → Restore to DOM
 */
class UploadManager {
	constructor() {
		this.queue = window.jvbQueue;
		this.a11y = window.jvbA11y;
		this.error = window.jvbError;

		// Store initialization flags
		this.storesReady = false;
		this.hasCheckedForRecovery = false;

		// Register stores
		const { uploads, groups } = window.jvbStore.register(
			'uploads',
			[
				{
					storeName: 'uploads',
					keyPath: 'id',
					storeBlobs: true,
					indexes: [
						{ name: 'fieldId', keyPath: 'fieldId' },
						{ name: 'status', keyPath: 'status' },
						{ name: 'groupId', keyPath: 'groupId' },
						{ name: 'pageUrl', keyPath: 'pageUrl' }
					],
					TTL: 7 * 24 * 60 * 60 * 1000, // 1 week
					delayFetch: true
				},
				{
					storeName: 'groups',
					keyPath: 'id',
					indexes: [
						{ name: 'fieldId', keyPath: 'fieldId' },
						{ name: 'pageUrl', keyPath: 'pageUrl' }
					],
					TTL: 7 * 24 * 60 * 60 * 1000,
					delayFetch: true
				}
			]
		);

		this.uploadStore = uploads;
		this.groupStore = groups;

		// Subscribe to store events
		this.uploadStore.subscribe(this.handleStoreEvent.bind(this, 'uploads'));
		this.groupStore.subscribe(this.handleStoreEvent.bind(this, 'groups'));

		// RUNTIME DATA - DOM references only, not persisted
		this.fieldElements = new Map();   // fieldId → { element, ui, config }
		this.uploadElements = new Map();  // uploadId → { element, preview, location }
		this.groupElements = new Map();   // groupId → { element, grid, fieldId }

		// Selection state
		this.selected = new Map();		// fieldId -> { }
		this.selectionHandlers = new Map();
		this.sortableInstances = new Map();

		// Preview URL tracking for cleanup
		this.previewUrls = new Set();

		// Worker for image processing
		this.worker = this.createWorkerConfig();

		// Notification subscribers
		this.subscribers = new Set();

		// Selectors
		this.selectors = {
			field: {
				field: '[data-upload-field]',
				input: 'input[type="file"]',
				dropZone: '.file-upload-container',
				preview: '.item-grid.preview',
				progress: '.image-progress'
			},
			groups: {
				container: '.upload-group',
				grid: '.item-grid.group',
				header: '.group-header',
				selectAll: '[name="select-all-group"]',
				actions: '.group-actions',
				count: '.selection-controls .info'
			},
			items: {
				item: '[data-upload-id]',
				checkbox: '[name*="select-item"]',
				featured: '[name="featured"]',
				details: 'details'
			}
		};

		this.statusMapping = {
			'received': 'Image Received',
			'processing': 'Processing Image...',
			'queued': 'Waiting to upload...',
			'uploading': 'Uploading to Server',
			'pending': 'Sent to server, awaiting processing.',
			'server_processing': 'Processing on server...',
			'completed': 'Upload complete!',
			'failed': 'Upload failed (will retry)',
			'failed_permanent': 'Upload failed permanently'
		};

		this.init();
	}

	/*******************************************************************************
	 * INITIALIZATION
	 *******************************************************************************/

	async init() {
		this.initListeners();
		this.initQueueSubscription();

		window.addEventListener('beforeunload', () => this.cleanupAllPreviewUrls());
	}

	createWorkerConfig() {
		return {
			worker: null,
			tasks: new Map(),
			restart: { count: 0, max: 3 },
			settings: {
				timeout: 10000,
				maxConcurrent: 3,
				restartAfterTimeout: true
			}
		};
	}

	initQueueSubscription() {
		this.queue.subscribe((event, operation) => {
			if (!['uploads', 'uploads/meta', 'uploads/groups'].includes(operation.endpoint)) {
				return;
			}

			const fieldId = operation.data instanceof FormData
				? operation.data.get('fieldId')
				: operation.data?.fieldId;

			switch (event) {
				case 'cancel-operation':
					if (fieldId) this.handleOperationCancelled(fieldId);
					break;
				case 'operation-status':
					if (fieldId) this.updateFieldStatus(fieldId, operation.status);
					break;
				case 'operation-complete':
					this.handleOperationComplete(operation, fieldId);
					break;
				case 'operation-failed':
				case 'operation-failed-permanent':
					this.handleOperationFailed(operation, fieldId);
					break;
			}
		});
	}

	/*******************************************************************************
	 * STORE EVENT HANDLING & RECOVERY
	 *******************************************************************************/

	handleStoreEvent(storeName, event, data) {
		if (event === 'data-loaded') {
			this.checkStoresReady();
		}
	}

	checkStoresReady() {
		// Both stores need to be ready before checking for recovery
		const uploadsReady = this.uploadStore.getStore()._initialized;
		const groupsReady = this.groupStore.getStore()._initialized;

		if (uploadsReady && groupsReady && !this.hasCheckedForRecovery) {
			this.hasCheckedForRecovery = true;
			this.storesReady = true;
			this.checkForRecoverableUploads();
		}
	}

	async checkForRecoverableUploads() {
		const allUploads = this.uploadStore.getAll();

		// Find uploads that weren't completed and don't have an active operation
		const recoverableUploads = allUploads.filter(upload =>
			!upload.operationId &&
			['processed', 'processing', 'queued'].includes(upload.status)
		);

		if (recoverableUploads.length === 0) return;

		// Group by fieldId for display
		const byField = this.groupUploadsByField(recoverableUploads);
		await this.showRecoveryNotification(byField);
	}

	groupUploadsByField(uploads) {
		const byField = new Map();

		uploads.forEach(upload => {
			if (!byField.has(upload.fieldId)) {
				byField.set(upload.fieldId, {
					fieldId: upload.fieldId,
					pageUrl: upload.pageUrl,
					uploads: [],
					groups: new Map()
				});
			}

			const fieldData = byField.get(upload.fieldId);
			fieldData.uploads.push(upload);

			// Track groups
			if (upload.groupId) {
				const group = this.groupStore.get(upload.groupId);
				if (group) {
					fieldData.groups.set(upload.groupId, group);
				}
			}
		});

		return byField;
	}

	/*******************************************************************************
	 * FIELD MANAGEMENT - Runtime only, no persistence
	 *******************************************************************************/

	scanFields(container, autoUpload = false) {
		const fields = container.querySelectorAll(this.selectors.field.field);
		fields.forEach(uploader => this.registerUploader(uploader, autoUpload));
	}

	registerUploader(uploader, autoUpload = false) {
		const fieldId = this.determineFieldId(uploader);
		const config = this.extractFieldConfig(uploader, autoUpload);
		const ui = this.buildFieldUI(uploader);

		// Store DOM references only - not persisted
		this.fieldElements.set(fieldId, { element: uploader, ui, config });

		uploader.dataset.uploader = fieldId;
		this.addFieldSelectionHandler(fieldId);

		if (config.type !== 'single') {
			this.initSortable(fieldId);
		}

		return fieldId;
	}

	extractFieldConfig(fieldElement, autoUpload) {
		return {
			autoUpload,
			destination: fieldElement.dataset.destination || 'meta',
			content: fieldElement.dataset.content || null,
			mode: fieldElement.dataset.mode || 'direct',
			type: fieldElement.dataset.type || 'single',
			name: fieldElement.dataset.field,
			itemID: fieldElement.dataset.itemId || 0,
			maxFiles: parseInt(fieldElement.dataset.maxFiles) || 999,
			subtype: fieldElement.dataset.subtype || 'image'
		};
	}

	buildFieldUI(fieldElement) {
		const UI = {
			field: fieldElement,
			input: fieldElement.querySelector(this.selectors.field.input),
			dropZone: fieldElement.querySelector(this.selectors.field.dropZone),
			preview: fieldElement.querySelector(this.selectors.field.preview),
			progress: {
				container: fieldElement.querySelector(this.selectors.field.progress),
				bar: fieldElement.querySelector('.bar'),
				fill: fieldElement.querySelector('.fill'),
				details: fieldElement.querySelector('.details'),
				text: fieldElement.querySelector('.details .text'),
				count: fieldElement.querySelector('.details .count')
			}
		};

		const display = fieldElement.querySelector('.group-display');
		if (display) {
			UI.groups = {
				display,
				container: fieldElement.querySelector('.item-grid.groups'),
				empty: fieldElement.querySelector('.empty-group'),
				groups: new Map()
			};
		}

		return UI;
	}

	/**
	 * Get uploads for a field - derived from store, not cached
	 */
	getFieldUploads(fieldId) {
		return this.uploadStore.getAll().filter(u => u.fieldId === fieldId);
	}

	/**
	 * Get groups for a field - derived from store
	 */
	getFieldGroups(fieldId) {
		return this.groupStore.getAll().filter(g => g.fieldId === fieldId);
	}

	/**
	 * Get upload count for a field
	 */
	getFieldUploadCount(fieldId) {
		return this.getFieldUploads(fieldId).length;
	}

	/*******************************************************************************
	 * FILE PROCESSING
	 *******************************************************************************/

	async processFiles(fieldId, files) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const { config, ui } = fieldEl;

		// Show group display, hide upload zone
		if (ui.dropZone) ui.dropZone.hidden = true;
		if (ui.groups?.display) ui.groups.display.hidden = false;

		const totalFiles = files.length;
		let processedCount = 0;

		this.updateFieldProgress(fieldId, 0, totalFiles, 'Processing files...');

		const processPromises = Array.from(files).map(async (file) => {
			try {
				const uploadId = this.generateId('upload');

				// Create upload data
				const uploadData = {
					id: uploadId,
					fieldId,
					pageUrl: window.location.href,
					status: 'processing',
					groupId: null,
					attachmentId: null,
					meta: {
						originalName: file.name,
						size: file.size,
						type: file.type
					}
				};

				// Save initial state
				await this.uploadStore.save(uploadData);

				// Process file
				const preview = this.createPreviewUrl(file);
				const processedFile = file.type.startsWith('image/')
					? await this.processImage(file, uploadId)
					: file;

				// Show progress
				this.showUploadProgress(uploadId, true);
				this.updateUploadItemProgress(uploadId, 50, 'processing');

				// Store blob data
				await this.saveBlobData(uploadId, processedFile || file);

				// Create DOM element
				const subtype = this.getSubtypeFromMime(file.type);
				const element = this.createUploadElement({
					id: uploadId,
					preview,
					meta: uploadData.meta,
					subtype
				}, config.destination === 'post_group');

				// Add to preview grid
				if (ui.preview) {
					ui.preview.appendChild(element);
					this.uploadElements.set(uploadId, { element, preview, location: ui.preview });
				}

				// Update status
				await this.updateUploadStatus(uploadId, 'processed');

				// Update progress
				processedCount++;
				this.updateFieldProgress(fieldId, processedCount, totalFiles, 'Processing files...');
				this.updateUploadItemProgress(uploadId, 100, 'processed');

				setTimeout(() => this.showUploadProgress(uploadId, false), 1000);

				return uploadId;

			} catch (error) {
				console.error('Error processing file:', file.name, error);
				processedCount++;
				this.updateFieldProgress(fieldId, processedCount, totalFiles, 'Processing files...');
				return null;
			}
		});

		await Promise.all(processPromises);

		this.updateFieldState(fieldId);
		this.refreshSortable(fieldId);

		// Queue for upload if auto-upload enabled
		if (config.autoUpload && config.destination !== 'post_group') {
			await this.queueUpload(fieldId);
			this.maybeLockUploads(fieldId);
		}
	}

	/*******************************************************************************
	 * IMAGE PROCESSING (unchanged logic, just cleaner structure)
	 *******************************************************************************/

	async processImage(file, uploadId) {
		const timeout = this.worker.settings.timeout;

		return new Promise((resolve, reject) => {
			let timeoutId;
			let completed = false;

			timeoutId = setTimeout(() => {
				if (!completed) {
					completed = true;
					this.worker.tasks.delete(uploadId);
					if (this.worker.settings.restartAfterTimeout) {
						this.restartWorker();
					}
					reject(new Error(`Processing timeout for ${file.name}`));
				}
			}, timeout);

			this.worker.tasks.set(uploadId, { file, timeoutId });

			this.handleImageProcess(file, uploadId)
				.then(result => {
					if (!completed) {
						completed = true;
						clearTimeout(timeoutId);
						this.worker.tasks.delete(uploadId);
						resolve(result);
					}
				})
				.catch(error => {
					if (!completed) {
						completed = true;
						clearTimeout(timeoutId);
						this.worker.tasks.delete(uploadId);
						reject(error);
					}
				});
		});
	}

	async handleImageProcess(file, uploadId) {
		if (!file.type.startsWith('image/')) return file;

		const maxDimension = this.getMaxDimension();
		const quality = 0.95;

		if (this.shouldUseWorker(file)) {
			try {
				if (!this.worker.worker) this.initWorker();
				if (this.worker.worker) {
					return await this.processWithWorker(file, uploadId, maxDimension, quality);
				}
			} catch (error) {
				console.warn('Worker failed, using main thread:', error);
			}
		}

		return this.processOnMainThread(file, maxDimension, quality);
	}

	async processOnMainThread(file, maxDimension, quality) {
		return new Promise((resolve, reject) => {
			const img = new Image();
			const canvas = document.createElement('canvas');
			const ctx = canvas.getContext('2d');
			let objectUrl = null;

			const cleanup = () => {
				img.onload = img.onerror = null;
				if (objectUrl) {
					URL.revokeObjectURL(objectUrl);
					objectUrl = null;
				}
				canvas.width = canvas.height = 1;
				ctx.clearRect(0, 0, 1, 1);
			};

			img.onload = () => {
				try {
					const { width, height } = this.calculateDimensions(img, maxDimension);
					canvas.width = width;
					canvas.height = height;

					ctx.imageSmoothingEnabled = true;
					ctx.imageSmoothingQuality = 'high';
					ctx.drawImage(img, 0, 0, width, height);

					const outputFormat = this.getOptimalFormat(file);
					const outputQuality = this.getOptimalQuality(file, quality);

					canvas.toBlob(
						(blob) => {
							cleanup();
							if (blob) {
								resolve(new File(
									[blob],
									this.getProcessedFileName(file, outputFormat),
									{ type: outputFormat, lastModified: Date.now() }
								));
							} else {
								reject(new Error('Canvas toBlob failed'));
							}
						},
						outputFormat,
						outputQuality
					);
				} catch (error) {
					cleanup();
					reject(new Error(`Canvas processing failed: ${error.message}`));
				}
			};

			img.onerror = () => {
				cleanup();
				reject(new Error(`Failed to load image: ${file.name}`));
			};

			try {
				objectUrl = this.createPreviewUrl(file);
				img.src = objectUrl;
			} catch (error) {
				cleanup();
				reject(new Error(`Failed to create object URL: ${error.message}`));
			}
		});
	}

	// Worker methods (simplified)
	initWorker() {
		if (this.worker.worker || typeof Worker === 'undefined') return;

		try {
			const workerScript = `
				self.onmessage = async function(e) {
					const { messageId, file, maxDimension, quality, outputFormat } = e.data;
					try {
						const bitmap = await createImageBitmap(file);
						const scale = Math.min(maxDimension / bitmap.width, maxDimension / bitmap.height, 1);
						const width = Math.round(bitmap.width * scale);
						const height = Math.round(bitmap.height * scale);
						const canvas = new OffscreenCanvas(width, height);
						const ctx = canvas.getContext('2d');
						ctx.imageSmoothingEnabled = true;
						ctx.imageSmoothingQuality = 'high';
						ctx.drawImage(bitmap, 0, 0, width, height);
						bitmap.close();
						const blob = await canvas.convertToBlob({ type: outputFormat, quality });
						self.postMessage({ messageId, success: true, blob, format: outputFormat });
					} catch (error) {
						self.postMessage({ messageId, success: false, error: error.message });
					}
				};
			`;

			const blob = new Blob([workerScript], { type: 'application/javascript' });
			this.worker.worker = new Worker(this.createPreviewUrl(blob));
		} catch (error) {
			console.warn('Failed to initialize worker:', error);
			this.worker.worker = null;
		}
	}

	async processWithWorker(file, uploadId, maxDimension, quality) {
		return new Promise((resolve, reject) => {
			if (!this.worker.worker) {
				reject(new Error('Worker not available'));
				return;
			}

			const messageId = `${uploadId}_${Date.now()}`;
			const outputFormat = this.getOptimalFormat(file);

			const handler = (e) => {
				if (e.data.messageId !== messageId) return;
				this.worker.worker.removeEventListener('message', handler);
				this.worker.worker.removeEventListener('error', errorHandler);

				if (e.data.success) {
					resolve(new File(
						[e.data.blob],
						this.getProcessedFileName(file, e.data.format || outputFormat),
						{ type: e.data.format || outputFormat, lastModified: Date.now() }
					));
				} else {
					reject(new Error(e.data.error || 'Worker processing failed'));
				}
			};

			const errorHandler = (error) => {
				this.worker.worker.removeEventListener('message', handler);
				this.worker.worker.removeEventListener('error', errorHandler);
				reject(new Error(`Worker error: ${error.message}`));
			};

			this.worker.worker.addEventListener('message', handler);
			this.worker.worker.addEventListener('error', errorHandler);
			this.worker.worker.postMessage({ messageId, file, maxDimension, quality, outputFormat });
		});
	}

	restartWorker() {
		if (this.worker.worker) {
			this.worker.worker.terminate();
			this.worker.worker = null;
		}
		this.worker.tasks.clear();

		if (this.worker.restart.count < this.worker.restart.max) {
			this.worker.restart.count++;
			this.initWorker();
		}
	}

	// Image processing helpers
	calculateDimensions(img, maxDimension) {
		let { width, height } = img;
		if (width <= maxDimension && height <= maxDimension) {
			return { width, height };
		}
		const scale = Math.min(maxDimension / width, maxDimension / height);
		return { width: Math.round(width * scale), height: Math.round(height * scale) };
	}

	getMaxDimension() {
		const screenWidth = window.screen.width;
		const dpr = window.devicePixelRatio || 1;
		if (screenWidth * dpr > 2560) return 2400;
		if (screenWidth * dpr > 1920) return 1920;
		return 1200;
	}

	shouldUseWorker(file) {
		return this.worker.worker && file.size > 1024 * 1024 && typeof OffscreenCanvas !== 'undefined';
	}

	getOptimalFormat(file) {
		if (file.type === 'image/gif' || file.type === 'image/svg+xml') return file.type;
		return this.supportsWebP() ? 'image/webp' : 'image/jpeg';
	}

	getOptimalQuality(file, requestedQuality) {
		if (file.size < 500 * 1024) return Math.max(requestedQuality, 0.9);
		if (file.size < 2 * 1024 * 1024) return requestedQuality;
		return Math.min(requestedQuality, 0.8);
	}

	getProcessedFileName(file, outputFormat) {
		const baseName = file.name.replace(/\.[^/.]+$/, '');
		const extensions = { 'image/webp': '.webp', 'image/jpeg': '.jpg', 'image/png': '.png', 'image/gif': '.gif' };
		return baseName + (extensions[outputFormat] || '.jpg');
	}

	supportsWebP() {
		const canvas = document.createElement('canvas');
		return canvas.toDataURL('image/webp').startsWith('data:image/webp');
	}

	/*******************************************************************************
	 * BLOB DATA MANAGEMENT
	 *******************************************************************************/

	async saveBlobData(uploadId, file) {
		const arrayBuffer = await file.arrayBuffer();
		const upload = this.uploadStore.get(uploadId) || { id: uploadId };

		upload.blobData = {
			buffer: arrayBuffer,
			name: file.name,
			type: file.type,
			size: file.size,
			lastModified: file.lastModified || Date.now()
		};

		await this.uploadStore.save(upload);
	}

	async getBlobData(uploadId) {
		const upload = this.uploadStore.get(uploadId);
		if (!upload?.blobData) return null;

		const blob = new Blob([upload.blobData.buffer], { type: upload.blobData.type });
		return new File([blob], upload.blobData.name, {
			type: upload.blobData.type,
			lastModified: upload.blobData.lastModified
		});
	}

	/*******************************************************************************
	 * QUEUE INTEGRATION
	 *******************************************************************************/

	async queueUpload(fieldId) {
		const uploads = this.getFieldUploads(fieldId);
		if (uploads.length === 0) return;

		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const formData = await this.prepareUploadFormData(fieldId, uploads, fieldEl.config);

		this.a11y.announce('Queuing for upload');

		const operation = {
			endpoint: 'uploads',
			method: 'POST',
			data: formData,
			title: `Uploading ${uploads.length} file${uploads.length > 1 ? 's' : ''}...`,
			popup: `Uploading ${uploads.length} file${uploads.length > 1 ? 's' : ''}...`,
			canMerge: false,
			headers: { 'action_nonce': window.auth.getNonce('dash') },
			append: '_upload'
		};

		try {
			const operationId = await this.queue.addToQueue(operation);

			// Update upload statuses
			for (const upload of uploads) {
				upload.operationId = operationId;
				upload.status = 'queued';
				await this.uploadStore.save(upload);
				this.updateUploadUI(upload.id);
			}

			return operationId;
		} catch (error) {
			throw error;
		}
	}

	async prepareUploadFormData(fieldId, uploads, config) {
		const formData = new FormData();

		formData.append('content', config.content);
		formData.append('mode', config.mode);
		formData.append('field_name', config.name);
		formData.append('fieldId', fieldId);
		formData.append('field_type', config.type);
		formData.append('subtype', config.subtype);
		formData.append('item_id', config.itemID);
		formData.append('destination', config.destination || 'meta');

		const uploadMap = [];

		for (const upload of uploads) {
			const file = await this.getBlobData(upload.id);
			if (file) {
				formData.append('files[]', file);
				uploadMap.push(upload.id);
			}
		}

		formData.append('upload_ids', JSON.stringify(uploadMap));
		return formData;
	}

	async submitGroupedUploads(fieldId) {
		const uploads = this.getFieldUploads(fieldId);
		const groups = this.getFieldGroups(fieldId);
		const fieldEl = this.fieldElements.get(fieldId);

		if (uploads.length === 0 || !fieldEl) return;

		const formData = new FormData();
		const posts = [];
		const uploadMap = [];

		// Process each group
		for (const group of groups) {
			const groupUploads = uploads.filter(u => u.groupId === group.id);

			const post = {
				images: [],
				fields: { ...group.fields }
			};

			for (const upload of groupUploads) {
				const file = await this.getBlobData(upload.id);
				if (file) {
					formData.append('files[]', file);
					post.images.push({ upload_id: upload.id, index: uploadMap.length });
					uploadMap.push(upload.id);

					// Check featured
					const uploadEl = this.uploadElements.get(upload.id);
					const featured = uploadEl?.element?.querySelector('[name="featured"]');
					if (featured?.checked) {
						post.fields.featured = upload.id;
					}
				}
			}

			if (post.images.length > 0) {
				posts.push(post);
			}
		}

		// Handle ungrouped uploads - each becomes its own post
		const ungrouped = uploads.filter(u => !u.groupId);
		for (const upload of ungrouped) {
			const file = await this.getBlobData(upload.id);
			if (file) {
				formData.append('files[]', file);
				posts.push({
					images: [{ upload_id: upload.id, index: uploadMap.length }],
					fields: {}
				});
				uploadMap.push(upload.id);
			}
		}

		formData.append('content', fieldEl.config.content);
		formData.append('user', fieldEl.config.itemID);
		formData.append('posts', JSON.stringify(posts));
		formData.append('upload_ids', JSON.stringify(uploadMap));

		const operation = {
			endpoint: 'uploads/groups',
			method: 'POST',
			data: formData,
			title: `Creating ${posts.length} ${fieldEl.config.content}${posts.length > 1 ? 's' : ''}...`,
			popup: `Creating ${posts.length} post${posts.length > 1 ? 's' : ''}...`,
			canMerge: false,
			headers: { 'action_nonce': window.auth.getNonce('dash') },
			append: '_upload'
		};

		try {
			const operationId = await this.queue.addToQueue(operation);

			for (const upload of uploads) {
				upload.operationId = operationId;
				upload.status = 'queued';
				await this.uploadStore.save(upload);
				this.updateUploadUI(upload.id);
			}

			this.a11y.announce(`Creating ${posts.length} post${posts.length > 1 ? 's' : ''}`);
			return operationId;
		} catch (error) {
			this.error.log(error, { component: 'UploadManager', action: 'submitGroupedUploads', fieldId });
			throw error;
		}
	}

	async queueUploadMeta(e) {
		const uploadId = this.getUploadIdFromElement(e.target);
		const upload = this.uploadStore.get(uploadId);
		if (!upload) return;

		const data = { [e.target.name]: e.target.value };
		upload.meta = { ...upload.meta, ...data };
		await this.uploadStore.save(upload);

		const queueData = { [upload.attachmentId ?? upload.id]: upload.meta };

		const operation = {
			endpoint: 'uploads/meta',
			method: 'POST',
			data: queueData,
			title: 'Updating meta',
			canMerge: true,
			headers: { 'action_nonce': window.auth.getNonce('dash') }
		};

		try {
			await this.queue.addToQueue(operation);
		} catch (error) {
			this.error.log(error, { component: 'UploadManager', action: 'queueUploadMeta', uploadId });
		}
	}

	/*******************************************************************************
	 * QUEUE EVENT HANDLERS - Cleanup after success
	 *******************************************************************************/

	async handleOperationComplete(operation, fieldId) {
		const results = operation.result?.data || operation.serverData?.data || [];

		// Update attachment IDs
		for (const result of results) {
			const upload = this.uploadStore.get(result.upload_id);
			if (upload) {
				upload.attachmentId = result.attachment_id;
				upload.status = 'completed';
				await this.uploadStore.save(upload);
				this.updateUploadUI(result.upload_id);
			}
		}

		if (!fieldId) return;

		// Clear completed uploads and their groups
		await this.clearCompletedUploads(fieldId);

		this.updateFieldState(fieldId);
		this.a11y.announce('All uploads completed successfully');
	}

	async clearCompletedUploads(fieldId) {
		const uploads = this.getFieldUploads(fieldId);
		const groupIds = new Set();

		for (const upload of uploads) {
			if (upload.status === 'completed') {
				if (upload.groupId) groupIds.add(upload.groupId);
				await this.clearUpload(upload.id);
			}
		}

		// Clear associated groups
		for (const groupId of groupIds) {
			await this.groupStore.delete(groupId);
			this.groupElements.delete(groupId);
		}
	}

	handleOperationFailed(operation, fieldId) {
		const uploadIds = operation.data instanceof FormData
			? JSON.parse(operation.data.get('upload_ids') || '[]')
			: operation.data?.upload_ids || [];

		const status = operation.status === 'operation-failed-permanent' ? 'failed_permanent' : 'failed';

		uploadIds.forEach(async uploadId => {
			await this.updateUploadStatus(uploadId, status);
		});

		if (fieldId) this.updateFieldState(fieldId);
	}

	async handleOperationCancelled(fieldId) {
		const uploads = this.getFieldUploads(fieldId);
		const groups = this.getFieldGroups(fieldId);

		for (const upload of uploads) {
			await this.clearUpload(upload.id);
		}

		for (const group of groups) {
			await this.groupStore.delete(group.id);
			this.groupElements.delete(group.id);
		}

		this.updateFieldState(fieldId);
		this.a11y.announce('Upload cancelled');
	}

	/*******************************************************************************
	 * GROUP MANAGEMENT
	 *******************************************************************************/

	async createGroup(fieldId, groupId = null) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return null;

		groupId = groupId || this.generateId('group');

		// Create group data
		const groupData = {
			id: groupId,
			fieldId,
			pageUrl: window.location.href,
			uploads: [],
			fields: {}
		};

		await this.groupStore.save(groupData);

		// Create DOM element
		const element = this.createGroupElement(groupId, fieldId);
		if (!element) return null;

		const grid = element.querySelector('.item-grid.group');

		// Store DOM references
		this.groupElements.set(groupId, { element, grid, fieldId });

		// Insert into DOM
		if (fieldEl.ui.groups?.container && fieldEl.ui.groups.empty) {
			fieldEl.ui.groups.container.insertBefore(element, fieldEl.ui.groups.empty);
		} else if (fieldEl.ui.groups?.container) {
			fieldEl.ui.groups.container.appendChild(element);
		}

		// Initialize sortable and selection
		this.addGroupSelectionHandler(fieldId, groupId);
		if (grid) this.createSortableForGrid(grid, fieldId, groupId);

		return { id: groupId, element, grid };
	}

	createGroupElement(groupId, fieldId) {
		const element = window.getTemplate('imageGroup');
		if (!element) return null;

		element.dataset.groupId = groupId;
		element.dataset.fieldId = fieldId;

		const fields = window.getTemplate('groupMetadata');
		const fieldsContainer = element.querySelector('.fields');

		if (fieldsContainer && fields) {
			fieldsContainer.append(fields);

			const titleInput = fieldsContainer.querySelector('[name="post_title"]');
			const excerptInput = fieldsContainer.querySelector('[name="post_excerpt"]');

			if (titleInput) {
				titleInput.id = `${groupId}_title`;
				titleInput.name = `${groupId}[post_title]`;
			}
			if (excerptInput) {
				excerptInput.id = `${groupId}_excerpt`;
				excerptInput.name = `${groupId}[post_excerpt]`;
			}

			const fieldEl = this.fieldElements.get(fieldId);
			if (fieldEl?.config.content) {
				const summary = element.querySelector('summary');
				if (summary) summary.textContent = fieldEl.config.content + ' Fields';
			}
		} else {
			element.querySelector('details')?.remove();
		}

		const gridContainer = element.querySelector('.item-grid.group');
		if (gridContainer) gridContainer.dataset.groupId = groupId;

		return element;
	}

	async deleteGroup(groupId, moveUploadsToPreview = true) {
		const groupEl = this.groupElements.get(groupId);
		if (!groupEl) return;

		const group = this.groupStore.get(groupId);
		const fieldEl = this.fieldElements.get(groupEl.fieldId);

		if (moveUploadsToPreview && group?.uploads) {
			for (const uploadId of group.uploads) {
				await this.removeFromGroup(uploadId);
			}
		}

		// Remove from store
		await this.groupStore.delete(groupId);

		// Remove DOM element
		groupEl.element?.remove();

		// Cleanup
		this.groupElements.delete(groupId);

		const sortableKey = `${groupEl.fieldId}-group-${groupId}`;
		this.sortableInstances.get(sortableKey)?.destroy();
		this.sortableInstances.delete(sortableKey);

		this.a11y.announce('Group removed');
	}

	async addToGroup(uploadId, targetGrid, persist = true) {
		const upload = this.uploadStore.get(uploadId);
		const uploadEl = this.uploadElements.get(uploadId);
		if (!upload || !uploadEl) return;

		const groupId = targetGrid.dataset.groupId;
		const group = this.groupStore.get(groupId);

		// Remove from previous group if needed
		if (upload.groupId && upload.groupId !== groupId) {
			const oldGroup = this.groupStore.get(upload.groupId);
			if (oldGroup) {
				oldGroup.uploads = oldGroup.uploads.filter(id => id !== uploadId);
				if (oldGroup.uploads.length === 0) {
					await this.deleteGroup(upload.groupId, false);
				} else {
					await this.groupStore.save(oldGroup);
				}
			}
		}

		// Add to new group
		upload.groupId = groupId;
		if (group && !group.uploads.includes(uploadId)) {
			group.uploads.push(uploadId);
			await this.groupStore.save(group);
		}

		// Update upload
		await this.uploadStore.save(upload);

		// Move DOM element
		targetGrid.appendChild(uploadEl.element);
		uploadEl.location = targetGrid;

		// Show featured radio
		const featured = uploadEl.element.querySelector('[name="featured"]');
		if (featured) {
			featured.hidden = false;
			featured.name = `${groupId}_featured`;
		}

		// Clear checkbox
		const checkbox = uploadEl.element.querySelector('[name*="select-item"]');
		if (checkbox) checkbox.checked = false;

		this.updateSortableState(targetGrid);
	}

	async removeFromGroup(uploadId) {
		const upload = this.uploadStore.get(uploadId);
		const uploadEl = this.uploadElements.get(uploadId);
		if (!upload || !uploadEl) return;

		const fieldEl = this.fieldElements.get(upload.fieldId);
		if (!fieldEl?.ui?.preview) return;

		// Update group
		if (upload.groupId) {
			const group = this.groupStore.get(upload.groupId);
			if (group) {
				group.uploads = group.uploads.filter(id => id !== uploadId);
				if (group.uploads.length === 0) {
					await this.deleteGroup(upload.groupId, false);
				} else {
					await this.groupStore.save(group);
				}
			}
			upload.groupId = null;
			await this.uploadStore.save(upload);
		}

		// Move to preview
		fieldEl.ui.preview.appendChild(uploadEl.element);
		uploadEl.location = fieldEl.ui.preview;

		// Hide featured radio
		const featured = uploadEl.element.querySelector('[name="featured"]');
		if (featured) {
			featured.hidden = true;
			featured.checked = false;
		}

		this.updateSortableState(fieldEl.ui.preview);
	}

	async removeUpload(fieldId, uploadId) {
		const upload = this.uploadStore.get(uploadId);
		const uploadEl = this.uploadElements.get(uploadId);

		if (upload?.groupId) {
			const group = this.groupStore.get(upload.groupId);
			if (group) {
				group.uploads = group.uploads.filter(id => id !== uploadId);
				if (group.uploads.length === 0) {
					await this.deleteGroup(upload.groupId, false);
				} else {
					await this.groupStore.save(group);
				}
			}
		}

		uploadEl?.element?.remove();
		await this.clearUpload(uploadId);

		this.updateFieldState(fieldId);
		this.maybeLockUploads(fieldId);

		this.selectionHandlers.get(fieldId)?.deselect(uploadId);
		this.a11y.announce('Upload removed');
	}

	async handleGroupMetaChange(input) {
		const groupEl = input.closest(this.selectors.groups.container);
		if (!groupEl) return;

		const groupId = groupEl.dataset.groupId;
		const group = this.groupStore.get(groupId);
		if (!group) return;

		let name = input.name;
		if (name.includes(groupId)) {
			name = name.replace(`${groupId}_`, '').replace(`${groupId}[`, '').replace(']', '');
		}

		group.fields[name] = input.value;
		await this.groupStore.save(group);
	}

	/*******************************************************************************
	 * SORTABLE & DRAG/DROP
	 *******************************************************************************/

	initSortable(fieldId) {
		if (!window.Sortable) return;

		if (!Sortable._multiDragMounted && Sortable.MultiDrag) {
			Sortable.mount(new Sortable.MultiDrag());
			Sortable._multiDragMounted = true;
		}

		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const grids = fieldEl.element.querySelectorAll('.item-grid.preview, .item-grid.group');
		grids.forEach(grid => {
			const groupId = grid.classList.contains('group')
				? grid.closest('.upload-group')?.dataset.groupId
				: null;
			this.createSortableForGrid(grid, fieldId, groupId);
		});

		// Empty group drop zone
		const emptyGroup = fieldEl.element.querySelector('.empty-group');
		if (emptyGroup && !emptyGroup.sortableInstance) {
			emptyGroup.sortableInstance = new Sortable(emptyGroup, {
				animation: 150,
				draggable: '.item',
				multiDrag: true,
				selectedClass: 'selected-for-drag',
				avoidImplicitDeselect: true,
				group: { name: fieldId, pull: false, put: true },
				ghostClass: 'sortable-ghost',
				onEnd: (evt) => this.handleDrop(evt, fieldId)
			});
		}
	}

	createSortableForGrid(grid, fieldId, groupId = null) {
		if (!grid || grid.sortableInstance) return;

		const instance = new Sortable(grid, {
			animation: 150,
			draggable: '.item',
			multiDrag: true,
			selectedClass: 'selected-for-drag',
			avoidImplicitDeselect: true,
			group: { name: fieldId, pull: true, put: true },
			ghostClass: 'sortable-ghost',
			chosenClass: 'sortable-chosen',
			dragClass: 'sortable-drag',
			onEnd: (evt) => this.handleDrop(evt, fieldId),
			onSelect: (evt) => this.syncCheckboxToSortable(evt.item, true),
			onDeselect: (evt) => this.syncCheckboxToSortable(evt.item, false),
			onAdd: (evt) => this.updateSortableState(evt.to),
			onRemove: (evt) => this.updateSortableState(evt.from)
		});

		grid.sortableInstance = instance;

		const gridId = groupId ? `${fieldId}-group-${groupId}` : `${fieldId}-preview`;
		this.sortableInstances.set(gridId, instance);

		return instance;
	}

	syncCheckboxToSortable(item, selected) {
		const checkbox = item.querySelector('[name*="select-item"]');
		if (checkbox && checkbox.checked !== selected) {
			checkbox.checked = selected;
			checkbox.dispatchEvent(new Event('change', { bubbles: true }));
		}
	}

	/**
	 * Unified drop handler - consolidated from multiple methods
	 */
	async handleDrop(evt, fieldId) {
		const target = evt.to;
		const source = evt.from;
		const items = evt.items?.length > 0 ? evt.items : [evt.item];
		const uploadIds = items.map(item => item.dataset.uploadId);

		// Same container = reorder only
		if (target === source) {
			this.handleReorder(evt);
			return;
		}

		const targetType = this.getDropTargetType(target);

		try {
			switch (targetType) {
				case 'empty-group':
					const group = await this.createGroup(fieldId);
					if (!group) throw new Error('Group creation failed');
					for (const uploadId of uploadIds) {
						await this.addToGroup(uploadId, group.grid, false);
					}
					break;

				case 'preview':
					for (const uploadId of uploadIds) {
						await this.removeFromGroup(uploadId);
					}
					break;

				case 'group':
					for (const uploadId of uploadIds) {
						await this.addToGroup(uploadId, target, false);
					}
					break;

				default:
					throw new Error('Unknown drop target');
			}

			this.finalizeDrop(fieldId, items.length, targetType);

		} catch (error) {
			console.error('Drop error:', error);
			// Return items to preview as fallback
			const fieldEl = this.fieldElements.get(fieldId);
			if (fieldEl?.ui?.preview) {
				items.forEach(item => fieldEl.ui.preview.appendChild(item));
			}
			this.a11y.announce('An error occurred. Items returned to preview.');
		}

		this.updateSortableState(target);
		if (source !== target) this.updateSortableState(source);
	}

	finalizeDrop(fieldId, count, targetType) {
		const messages = {
			'empty-group': count > 1 ? `Created group with ${count} items` : 'Created group with item',
			'preview': count > 1 ? `Moved ${count} items to preview` : 'Moved item to preview',
			'group': count > 1 ? `Moved ${count} items to group` : 'Moved item to group'
		};

		this.a11y.announce(messages[targetType] || 'Items moved');
		this.selectionHandlers.get(fieldId)?.clearSelection();
	}

	getDropTargetType(target) {
		if (target.classList.contains('empty-group')) return 'empty-group';
		if (target.classList.contains('preview')) return 'preview';
		if (target.classList.contains('group')) return 'group';
		return 'unknown';
	}

	handleReorder(evt) {
		const grid = evt.to;
		const fieldWrapper = grid.closest('.field, .upload');
		if (!fieldWrapper) return;

		const items = Array.from(grid.querySelectorAll('.item:not(.sortable-ghost):not(.sortable-clone)'))
			.map(el => el.dataset.uploadId)
			.filter(Boolean);

		const hiddenInput = fieldWrapper.querySelector('input[type="hidden"]');
		if (hiddenInput && items.length > 0) {
			hiddenInput.value = items.join(',');
		}

		// Update group order in store
		const groupId = grid.dataset.groupId;
		if (groupId) {
			const group = this.groupStore.get(groupId);
			if (group) {
				group.uploads = items;
				this.groupStore.save(group);
			}
		}

		this.a11y.announce('Item reordered');

		fieldWrapper.dispatchEvent(new CustomEvent('jvb-items-reordered', {
			detail: { from: evt.from, to: evt.to, items },
			bubbles: true
		}));
	}

	updateSortableState(grid) {
		const sortable = grid?.sortableInstance;
		if (sortable) sortable.option('disabled', false);
	}

	refreshSortable(fieldId) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const grids = fieldEl.element.querySelectorAll('.item-grid.preview, .item-grid.group');
		grids.forEach(grid => this.updateSortableState(grid));
	}

	syncSortableSelection(fieldId, selectedItems) {
		this.sortableInstances.forEach((instance, key) => {
			if (key.startsWith(fieldId)) {
				instance.el.querySelectorAll('.item').forEach(item => {
					const uploadId = item.dataset.uploadId;
					if (selectedItems.has(uploadId)) {
						Sortable.utils.select(item);
					} else {
						Sortable.utils.deselect(item);
					}
				});
			}
		});
	}

	/*******************************************************************************
	 * EVENT LISTENERS
	 *******************************************************************************/

	initListeners() {
		this.clickHandler = this.handleClick.bind(this);
		this.changeHandler = this.handleChange.bind(this);
		this.dragEnterHandler = this.handleDragEnter.bind(this);
		this.dragLeaveHandler = this.handleDragLeave.bind(this);
		this.dragOverHandler = this.handleDragOver.bind(this);
		this.dropHandler = this.handleExternalDrop.bind(this);

		document.addEventListener('click', this.clickHandler);
		document.addEventListener('change', this.changeHandler);
		document.addEventListener('dragenter', this.dragEnterHandler);
		document.addEventListener('dragleave', this.dragLeaveHandler);
		document.addEventListener('dragover', this.dragOverHandler);
		document.addEventListener('drop', this.dropHandler);
	}

	handleClick(e) {
		// Trigger file input
		const dropZone = e.target.closest(this.selectors.field.dropZone);
		if (dropZone && !e.target.matches('input, button, a')) {
			dropZone.querySelector(this.selectors.field.input)?.click();
		}

		// Action buttons
		const actionButton = e.target.closest('[data-action]');
		if (actionButton) this.handleAction(actionButton);
	}

	handleChange(e) {
		const fieldId = this.getFieldIdFromElement(e.target);
		if (!fieldId) return;

		// File input
		if (e.target.matches(this.selectors.field.input)) {
			const files = Array.from(e.target.files);
			if (files.length > 0) this.processFiles(fieldId, files);
			return;
		}

		// Meta field changes
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl?.config.autoUpload) return;

		if (fieldEl.config.destination === 'post_group') {
			this.handleGroupMetaChange(e.target);
		} else {
			this.queueUploadMeta(e);
		}
	}

	handleDragEnter(e) {
		if (!e.dataTransfer.types.includes('Files')) return;
		const dropZone = e.target.closest(this.selectors.field.dropZone);
		if (dropZone) {
			e.preventDefault();
			dropZone.classList.add('dragover');
		}
	}

	handleDragLeave(e) {
		const dropZone = e.target.closest(this.selectors.field.dropZone);
		if (dropZone && !dropZone.contains(e.relatedTarget)) {
			dropZone.classList.remove('dragover');
		}
	}

	handleDragOver(e) {
		if (!e.dataTransfer.types.includes('Files')) return;
		const dropZone = e.target.closest(this.selectors.field.dropZone);
		if (dropZone) {
			e.preventDefault();
			e.dataTransfer.dropEffect = 'copy';
		}
	}

	handleExternalDrop(e) {
		const dropZone = e.target.closest(this.selectors.field.dropZone);
		if (!dropZone) return;

		e.preventDefault();
		dropZone.classList.remove('dragover');

		const files = Array.from(e.dataTransfer.files);
		if (files.length === 0) return;

		const fieldId = this.getFieldIdFromElement(dropZone);
		if (fieldId) {
			this.processFiles(fieldId, files);
			this.a11y.announce(`${files.length} file(s) dropped for upload`);
		}
	}

	/*******************************************************************************
	 * ACTION HANDLERS
	 *******************************************************************************/

	handleAction(button) {
		const action = button.dataset.action;
		const fieldId = this.getFieldIdFromElement(button);

		switch (action) {
			case 'add-to-group':
				this.handleAddToGroup(fieldId);
				break;
			case 'delete-group':
				this.handleDeleteGroup(button);
				break;
			case 'delete-upload':
			case 'remove-from-group':
				this.handleRemoveItem(button);
				break;
			case 'upload':
				this.handleSubmitUploads(fieldId);
				break;
			case 'restore':
				this.handleRestoreSelected();
				break;
			case 'restore-all':
				this.handleRestoreAll();
				break;
			case 'clear-cache':
				this.handleClearCache();
				break;
		}
	}

	async handleAddToGroup(fieldId) {
		const selected = this.selected.get(fieldId);

		if (!selected || selected.size === 0) {
			await this.createGroup(fieldId);
		} else {
			const group = await this.createGroup(fieldId);
			if (!group) return;

			for (const uploadId of selected) {
				await this.addToGroup(uploadId, group.grid, false);
			}

			this.selectionHandlers.get(fieldId)?.clearSelection();
			this.a11y.announce(`Created group with ${selected.size} items`);
		}
	}

	async handleDeleteGroup(button) {
		const group = button.closest(this.selectors.groups.container);
		if (!group) return;

		const groupId = group.dataset.groupId;

		if (!confirm('Delete this group? Items will be moved back to the upload area.')) {
			return;
		}

		await this.deleteGroup(groupId, true);
	}

	async handleRemoveItem(button) {
		const item = button.closest(this.selectors.items.item);
		if (!item) return;

		if (!confirm('Remove this item?')) return;

		const uploadId = item.dataset.uploadId;
		const fieldId = this.getFieldIdFromElement(item);

		await this.removeUpload(fieldId, uploadId);
	}

	handleSubmitUploads(fieldId) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		fieldEl.element.closest('details')?.removeAttribute('open');
		document.body.classList.add('uploading');

		if (fieldEl.config.destination === 'post_group') {
			this.submitGroupedUploads(fieldId);
		} else {
			this.queueUpload(fieldId);
		}
	}

	/*******************************************************************************
	 * SELECTION MANAGEMENT
	 *******************************************************************************/

	addFieldSelectionHandler(fieldId) {
		if (this.selectionHandlers.has(fieldId)) return;

		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl?.element) return;

		const handler = new window.jvbHandleSelection({
			container: fieldEl.element,
			ui: {
				selectAll: fieldEl.element.querySelector('[name="select-all-uploads"]'),
				bulkControls: fieldEl.element.querySelector('.selection-actions'),
				count: fieldEl.element.querySelector('.selection-count')
			},
			itemSelector: '[data-upload-id]',
			checkboxSelector: '[name*="select-item"]'
		});

		handler.subscribe((event, data) => {
			if (['item-selected', 'item-deselected', 'range-selected'].includes(event)) {
				this.syncSortableSelection(fieldId, data.selectedItems);
				this.selected.set(fieldId, data.selectedItems);
			}
		});

		this.selectionHandlers.set(fieldId, handler);
	}

	addGroupSelectionHandler(fieldId, groupId) {
		const key = `${fieldId}_${groupId}`;
		if (this.selectionHandlers.has(key)) return;

		const groupEl = this.groupElements.get(groupId);
		if (!groupEl?.element) return;

		const handler = new window.jvbHandleSelection({
			container: groupEl.element,
			ui: {
				selectAll: groupEl.element.querySelector(this.selectors.groups.selectAll),
				bulkControls: groupEl.element.querySelector(this.selectors.groups.actions),
				count: groupEl.element.querySelector(this.selectors.groups.count)
			},
			itemSelector: '[data-upload-id]',
			checkboxSelector: '[name*="select-item"]'
		});

		handler.subscribe((event, data) => {
			if (['item-selected', 'item-deselected', 'range-selected'].includes(event)) {
				this.selected.set(fieldId, data.selectedItems);
			}
		});

		this.selectionHandlers.set(key, handler);
	}

	/*******************************************************************************
	 * UI UPDATES
	 *******************************************************************************/

	updateFieldState(fieldId) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const uploadCount = this.getFieldUploadCount(fieldId);
		const groupCount = this.getFieldGroups(fieldId).length;

		fieldEl.element.dataset.hasUploads = uploadCount > 0;
		fieldEl.element.dataset.uploadCount = uploadCount;
		fieldEl.element.dataset.hasGroups = groupCount > 0;

		if (fieldEl.ui.preview) {
			fieldEl.ui.preview.setAttribute('aria-label',
				`Upload preview area with ${uploadCount} item${uploadCount !== 1 ? 's' : ''}`
			);
		}
	}

	updateFieldProgress(fieldId, current, total, message) {
		const fieldEl = this.fieldElements.get(fieldId);
		const progress = fieldEl?.ui?.progress;
		if (!progress?.container) return;

		const percent = total > 0 ? (current / total) * 100 : 0;

		if (progress.fill) progress.fill.style.width = `${percent}%`;
		if (progress.text) progress.text.textContent = message;
		if (progress.count) progress.count.textContent = `${current}/${total}`;

		progress.container.hidden = current === total;
	}

	updateFieldStatus(fieldId, status) {
		// Status is now derived from uploads, no field-level status needed
	}

	async updateUploadStatus(uploadId, status) {
		const upload = this.uploadStore.get(uploadId);
		if (!upload) return;

		upload.status = status;
		await this.uploadStore.save(upload);
		this.updateUploadUI(uploadId);
	}

	updateUploadUI(uploadId) {
		const uploadEl = this.uploadElements.get(uploadId);
		const upload = this.uploadStore.get(uploadId);
		if (!upload || !uploadEl?.element) return;

		// Update class
		uploadEl.element.className = uploadEl.element.className.replace(/status-[\w-]+/g, '');
		uploadEl.element.classList.add(`status-${upload.status}`);

		// Update progress
		const progress = uploadEl.element.querySelector('.progress');
		if (progress) {
			this.updateUploadItemProgress(uploadId, this.getStatusProgress(upload.status), upload.status);
		}
	}

	showUploadProgress(uploadId, show = true) {
		const uploadEl = this.uploadElements.get(uploadId);
		const progress = uploadEl?.element?.querySelector('.progress');
		if (!progress) return;

		if (show) {
			progress.style.removeProperty('animation');
			progress.hidden = false;
		} else {
			progress.style.animation = 'fadeOut var(--transition-base)';
			setTimeout(() => { progress.hidden = true; }, 300);
		}
	}

	updateUploadItemProgress(uploadId, percent, status = null) {
		const uploadEl = this.uploadElements.get(uploadId);
		const progress = uploadEl?.element?.querySelector('.progress');
		if (!progress) return;

		const fill = progress.querySelector('.fill');
		const details = progress.querySelector('.details');
		const icon = progress.querySelector('.icon');

		if (fill) fill.style.width = `${percent}%`;
		if (status && details) details.textContent = this.statusMapping[status] || status;
		if (status && icon) icon.innerHTML = this.getStatusIcon(status).outerHTML;
	}

	maybeLockUploads(fieldId) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl?.ui?.dropZone) return;

		const uploadCount = this.getFieldUploadCount(fieldId);
		const maxFiles = fieldEl.config.destination === 'post_group' ? 20 : (fieldEl.config.maxFiles || 999);

		fieldEl.ui.dropZone.hidden = uploadCount >= maxFiles;
		fieldEl.element.classList.toggle('at-max-uploads', uploadCount >= maxFiles);

		if (fieldEl.config.destination === 'post_group' && uploadCount >= maxFiles) {
			this.a11y.announce('Maximum of 20 uploads reached.');
		}
	}

	/*******************************************************************************
	 * CLEANUP
	 *******************************************************************************/

	async clearUpload(uploadId) {
		const uploadEl = this.uploadElements.get(uploadId);

		if (uploadEl) {
			this.revokePreviewUrl(uploadEl.preview);
			if (uploadEl.element?.dataset.previewUrl) {
				this.revokePreviewUrl(uploadEl.element.dataset.previewUrl);
			}
		}

		this.uploadElements.delete(uploadId);
		await this.uploadStore.delete(uploadId);
	}

	createPreviewUrl(file) {
		const url = URL.createObjectURL(file);
		this.previewUrls.add(url);
		return url;
	}

	revokePreviewUrl(url) {
		if (url?.startsWith('blob:')) {
			URL.revokeObjectURL(url);
			this.previewUrls.delete(url);
		}
	}

	cleanupAllPreviewUrls() {
		this.previewUrls.forEach(url => {
			try { URL.revokeObjectURL(url); } catch (e) {}
		});
		this.previewUrls.clear();
	}

	/*******************************************************************************
	 * RECOVERY & RESTORATION
	 *******************************************************************************/

	async showRecoveryNotification(byField) {
		let totalUploads = 0;
		let totalGroups = 0;

		byField.forEach(field => {
			totalUploads += field.uploads.length;
			totalGroups += field.groups.size;
		});

		const notification = window.getTemplate('restoreNotification');
		if (!notification) return;

		const message = totalGroups > 0
			? `${totalGroups} group${totalGroups > 1 ? 's' : ''} with ${totalUploads} upload${totalUploads > 1 ? 's' : ''} can be restored.`
			: `${totalUploads} upload${totalUploads > 1 ? 's' : ''} can be recovered.`;

		const detailsEl = notification.querySelector('.restore-details');
		if (detailsEl) detailsEl.textContent = message;

		// Build preview
		for (const [fieldId, fieldData] of byField) {
			const fieldTemplate = window.getTemplate('restoreField');
			if (!fieldTemplate) continue;

			const titleEl = fieldTemplate.querySelector('h3');
			if (titleEl) titleEl.textContent = fieldId;

			const itemGrid = fieldTemplate.querySelector('.item-grid.restore');

			for (const upload of fieldData.uploads) {
				const file = await this.getBlobData(upload.id);
				if (!file) continue;

				const uploadItem = this.createUploadElement({
					id: upload.id,
					preview: this.createPreviewUrl(file),
					meta: upload.meta,
					subtype: this.getSubtypeFromMime(file.type)
				}, false);

				uploadItem.dataset.fieldId = fieldId;
				itemGrid?.appendChild(uploadItem);
			}

			notification.querySelector('.wrap')?.appendChild(fieldTemplate);
		}

		document.querySelector('.field.upload')?.appendChild(notification);

		const dialog = document.querySelector('dialog.restore-uploads');
		if (dialog) {
			this.restoreModal = new window.jvbModal(dialog);
			this.restoreSelection = new window.jvbHandleSelection({
				container: dialog,
				ui: {
					selectAll: dialog.querySelector('#select-all-restore'),
					count: dialog.querySelector('.selection-count')
				}
			});
			this.restoreModal.handleOpen();
		}
	}

	async handleRestoreSelected() {
		const dialog = document.querySelector('dialog.restore-uploads');
		if (!dialog) return;

		const selected = [];
		dialog.querySelectorAll('[type=checkbox]:checked').forEach(checkbox => {
			const item = checkbox.closest('.item');
			if (item) {
				selected.push({
					uploadId: item.dataset.uploadId,
					fieldId: item.dataset.fieldId
				});
			}
		});

		if (selected.length > 0) {
			await this.restoreUploads(selected);
		}

		this.cleanupRestoreModal();
	}

	async handleRestoreAll() {
		const dialog = document.querySelector('dialog.restore-uploads');
		if (!dialog) return;

		const all = [];
		dialog.querySelectorAll('.item.upload').forEach(item => {
			all.push({
				uploadId: item.dataset.uploadId,
				fieldId: item.dataset.fieldId
			});
		});

		await this.restoreUploads(all);
		this.cleanupRestoreModal();
	}

	async restoreUploads(items) {
		const byField = new Map();

		items.forEach(item => {
			if (!byField.has(item.fieldId)) {
				byField.set(item.fieldId, []);
			}
			byField.get(item.fieldId).push(item.uploadId);
		});

		for (const [fieldId, uploadIds] of byField) {
			await this.restoreFieldUploads(fieldId, uploadIds);
		}
	}

	async restoreFieldUploads(fieldId, uploadIds) {
		// Find or register field element
		let fieldEl = this.fieldElements.get(fieldId);

		if (!fieldEl) {
			// Try to find by data attribute
			const element = document.querySelector(`[data-uploader="${fieldId}"]`);
			if (element) {
				this.registerUploader(element);
				fieldEl = this.fieldElements.get(fieldId);
			}
		}

		if (!fieldEl) {
			console.warn(`Field ${fieldId} not found for restoration`);
			return;
		}

		// Show upload UI
		if (fieldEl.ui.dropZone) fieldEl.ui.dropZone.hidden = true;
		if (fieldEl.ui.groups?.display) fieldEl.ui.groups.display.hidden = false;

		// Restore groups first
		const groups = this.getFieldGroups(fieldId);
		for (const group of groups) {
			await this.restoreGroup(fieldId, group);
		}

		// Restore uploads
		for (const uploadId of uploadIds) {
			const upload = this.uploadStore.get(uploadId);
			if (upload) {
				await this.restoreUploadElement(fieldId, upload);
			}
		}

		this.updateFieldState(fieldId);
		this.refreshSortable(fieldId);
		this.maybeLockUploads(fieldId);

		// Auto-upload if configured
		if (fieldEl.config.autoUpload && fieldEl.config.destination !== 'post_group') {
			await this.queueUpload(fieldId);
		}
	}

	async restoreGroup(fieldId, groupData) {
		const group = await this.createGroup(fieldId, groupData.id);
		if (!group) return;

		// Restore field values
		if (groupData.fields) {
			const titleInput = group.element.querySelector('[name*="post_title"]');
			const excerptInput = group.element.querySelector('[name*="post_excerpt"]');

			if (titleInput && groupData.fields.post_title) {
				titleInput.value = groupData.fields.post_title;
			}
			if (excerptInput && groupData.fields.post_excerpt) {
				excerptInput.value = groupData.fields.post_excerpt;
			}
		}
	}

	async restoreUploadElement(fieldId, upload) {
		const fieldEl = this.fieldElements.get(fieldId);
		if (!fieldEl) return;

		const file = await this.getBlobData(upload.id);
		if (!file) return;

		const preview = this.createPreviewUrl(file);
		const element = this.createUploadElement({
			id: upload.id,
			preview,
			meta: upload.meta,
			subtype: this.getSubtypeFromMime(file.type)
		}, fieldEl.config.destination === 'post_group');

		// Determine location
		let location;
		if (upload.groupId) {
			const groupEl = this.groupElements.get(upload.groupId);
			location = groupEl?.grid || fieldEl.ui.preview;
		} else {
			location = fieldEl.ui.preview;
		}

		location.appendChild(element);
		this.uploadElements.set(upload.id, { element, preview, location });

		// Update upload status
		upload.status = 'processed';
		await this.uploadStore.save(upload);
	}

	handleClearCache() {
		if (!confirm('Discard these uploads?')) return;
		this.cleanupStoredData();
		this.cleanupRestoreModal();
	}

	async cleanupStoredData() {
		await this.uploadStore.clear();
		await this.groupStore.clear();
	}

	cleanupRestoreModal() {
		if (this.restoreModal) {
			this.restoreModal.handleClose();
			this.restoreSelection?.destroy();
			this.restoreModal.destroy();
			this.restoreModal.modal.remove();
			this.restoreModal = null;
			this.restoreSelection = null;
		}
	}

	/*******************************************************************************
	 * HELPER METHODS
	 *******************************************************************************/

	generateId(prefix) {
		return `${prefix}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
	}

	determineFieldId(fieldElement) {
		const content = fieldElement.dataset.content ||
			fieldElement.closest('dialog')?.dataset.content ||
			fieldElement.closest('form')?.dataset.save || '';
		const itemID = fieldElement.dataset.itemId ||
			fieldElement.closest('dialog')?.dataset.itemId || '';
		const field = fieldElement.dataset.field || '';

		return `${content}_${itemID}_${field}`;
	}

	getFieldIdFromElement(el) {
		const field = el.closest(this.selectors.field.field);
		return field?.dataset.uploader || null;
	}

	getUploadIdFromElement(el) {
		const item = el.closest(this.selectors.items.item);
		return item?.dataset.uploadId || null;
	}

	getSubtypeFromMime(mimeType) {
		if (mimeType.startsWith('image/')) return 'image';
		if (mimeType.startsWith('video/')) return 'video';
		return 'document';
	}

	getStatusIcon(status) {
		return window.getIcon(this.queue.icons[status]);
	}

	getStatusProgress(status) {
		const progress = {
			'processing': 28,
			'queued': 50,
			'uploading': 66,
			'pending': 75,
			'server_processing': 89,
			'completed': 100
		};
		return progress[status] || 0;
	}

	formatBytes(bytes, decimals = 2) {
		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(decimals)) + ' ' + sizes[i];
	}

	createUploadElement(upload, draggable = false) {
		const element = window.getTemplate('uploadItem');
		if (!element) return null;

		element.dataset.uploadId = upload.id;
		element.dataset.subtype = upload.subtype || 'image';

		const featured = element.querySelector('[name="featured"]');
		const img = element.querySelector('img');
		const video = element.querySelector('video');
		const preview = element.querySelector('label > span');
		const details = element.querySelector('details');

		if (featured) featured.value = upload.id;

		switch (upload.subtype) {
			case 'image':
				if (img) {
					img.src = upload.preview;
					img.alt = upload.meta?.originalName || '';
				}
				video?.remove();
				preview?.remove();
				break;
			case 'video':
				if (video) video.src = upload.preview;
				img?.remove();
				preview?.remove();
				break;
			case 'document':
				const fileName = upload.meta?.originalName || '';
				const ext = fileName.split('.').pop()?.toLowerCase() || '';
				const iconMap = {
					'pdf': 'file-pdf', 'csv': 'file-csv',
					'doc': 'file-doc', 'docx': 'file-doc',
					'txt': 'file-txt', 'xls': 'file-xls', 'xlsx': 'file-xls'
				};
				const icon = window.getIcon(iconMap[ext] || 'file');
				if (preview) {
					preview.innerText = fileName;
					preview.prepend(icon);
				}
				img?.remove();
				video?.remove();
				break;
		}

		if (details) {
			const template = window.getTemplate('uploadMeta');
			if (template) details.append(template);
		}

		element.draggable = draggable;

		// Update input IDs
		element.querySelectorAll('input').forEach(input => {
			const id = input.id;
			if (id) {
				const newId = id + upload.id;
				const label = input.parentNode.querySelector(`label[for="${id}"]`);
				input.id = newId;
				if (label) label.htmlFor = newId;
			}
		});

		return element;
	}

	/**
	 * Get all files for a form
	 */
	async getFilesForForm(formElement) {
		const uploadFields = formElement.querySelectorAll('[data-upload-field]');
		const allFiles = [];

		for (const field of uploadFields) {
			const fieldId = this.determineFieldId(field);
			const files = await this.getFilesForField(fieldId);
			allFiles.push(...files);
		}

		return allFiles;
	}

	/**
	 * Get all files for a field
	 */
	async getFilesForField(fieldId) {
		const uploads = this.getFieldUploads(fieldId);
		const files = [];

		for (const upload of uploads) {
			const file = await this.getBlobData(upload.id);
			if (file) {
				files.push({
					file,
					uploadId: upload.id,
					fieldName: this.fieldElements.get(fieldId)?.config.name,
					meta: upload.meta || {}
				});
			}
		}

		return files;
	}

	/*******************************************************************************
	 * EVENT SYSTEM
	 *******************************************************************************/

	subscribe(callback) {
		this.subscribers.add(callback);
		return () => this.subscribers.delete(callback);
	}

	notify(event, data = {}) {
		this.subscribers.forEach(cb => {
			try { cb(event, data); } catch (e) { console.error('Subscriber error:', e); }
		});
	}

	/*******************************************************************************
	 * DESTROY
	 *******************************************************************************/

	destroy() {
		document.removeEventListener('click', this.clickHandler);
		document.removeEventListener('change', this.changeHandler);
		document.removeEventListener('dragenter', this.dragEnterHandler);
		document.removeEventListener('dragleave', this.dragLeaveHandler);
		document.removeEventListener('dragover', this.dragOverHandler);
		document.removeEventListener('drop', this.dropHandler);

		this.selectionHandlers.forEach(handler => handler.destroy());
		this.selectionHandlers.clear();

		this.cleanupAllPreviewUrls();

		this.sortableInstances.forEach(instance => instance?.destroy?.());
		this.sortableInstances.clear();

		this.uploadElements.clear();
		this.fieldElements.clear();
		this.groupElements.clear();
		this.selected.clear();
		this.subscribers.clear();
	}
}

// Initialize
document.addEventListener('DOMContentLoaded', async function() {
	window.auth.subscribe((event) => {
		if (event === 'auth-loaded') {
			window.jvbUploads = new UploadManager();
		}
	});
});