/**********************************************
 PopulateForm extracts saved data and populates the form field accordingly
 **********************************************/
class PopulateForm {
	constructor(form, itemDataOrFields = {}, legacyImages = {}, options = {}) {
		// Support both old signature (fields, images) and new signature (item object)
		this.item = this.normalizeItemData(itemDataOrFields, legacyImages);
		this.form = form;
		this.options = options;

		// Populate all fields
		for (let [fieldName, fieldValue] of Object.entries(this.item.fields)) {
			let wrapper = form.querySelector(`[data-field="${fieldName}"]`);
			if (wrapper) {
				this.populateField(wrapper, fieldName, fieldValue);
			}
		}
	}

	/**
	 * Normalize data to consistent structure
	 * Supports both new format (item object) and legacy format (fields, images)
	 */
	normalizeItemData(itemDataOrFields, legacyImages) {
		// Check if this is the new format (has a fields property) or legacy format
		if (itemDataOrFields && typeof itemDataOrFields === 'object' && 'fields' in itemDataOrFields) {
			// New format - already structured
			return {
				fields: itemDataOrFields.fields || {},
				images: itemDataOrFields.images || {},
				taxonomies: itemDataOrFields.taxonomies || {}
			};
		} else {
			// Legacy format - fields and images passed separately
			return {
				fields: itemDataOrFields || {},
				images: legacyImages || {},
				taxonomies: {}
			};
		}
	}

	/**
	 * Check if a field is a taxonomy field
	 */
	isTaxonomyField(fieldName) {
		return Object.hasOwn(this.item.taxonomies, fieldName) &&
			Object.keys(this.item.taxonomies[fieldName]).length > 0;
	}

	/**
	 * Check if a value references image data
	 */
	isImageField(value) {
		if (!this.item.images || Object.keys(this.item.images).length === 0) {
			return false;
		}

		const ids = this.splitIDs(value);
		return ids.some(id => Object.keys(this.item.images).includes(String(id)));
	}

	/**
	 * Split comma-separated IDs into array of integers
	 */
	splitIDs(value) {
		return String(value).split(',')
			.map(v => parseInt(v.trim()))
			.filter(v => !isNaN(v) && v > 0);
	}

	/**
	 * Populate a single field with its value
	 */
	populateField(fieldWrapper, fieldName, fieldValue, options = {}) {
		if (!fieldWrapper || fieldValue === undefined || fieldValue === null) {
			return;
		}

		// Determine field type from classes or data attributes
		const fieldType = this.getFieldType(fieldWrapper);

		switch (fieldType) {
			case 'upload':
			case 'gallery':
			case 'image':
				this.populateUploadField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'repeater':
				this.populateRepeaterField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'taxonomy':
				this.populateTaxonomyField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'user':
				this.populateUserField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'location':
				this.populateLocationField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'set':
			case 'checkbox':
				this.populateSetField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'select':
			case 'radio':
				this.populateSelectField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'true_false':
				this.populateBooleanField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'date':
			case 'time':
			case 'datetime':
				this.populateDateField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'number':
				this.populateNumberField(fieldWrapper, fieldName, fieldValue);
				break;

			case 'textarea':
				if (fieldWrapper.querySelector('.editor-container')) {
					this.populateEditorField(fieldWrapper, fieldName, fieldValue);
				} else {
					this.populateTextareaField(fieldWrapper, fieldName, fieldValue);
				}
				break;

			case 'text':
			case 'email':
			case 'url':
			case 'tel':
			case 'phone':
			default:
				this.populateTextField(fieldWrapper, fieldName, fieldValue);
				break;
		}
	}

	/**
	 * Populate taxonomy fields with visual display
	 */
	populateTaxonomyField(fieldWrapper, fieldName, fieldValue) {
		// Handle different value formats
		let termIds = [];

		if (Array.isArray(fieldValue)) {
			termIds = fieldValue.map(v => String(v));
		} else if (typeof fieldValue === 'string') {
			try {
				const parsed = JSON.parse(fieldValue);
				termIds = Array.isArray(parsed) ? parsed.map(v => String(v)) : [String(parsed)];
			} catch (e) {
				termIds = fieldValue.split(',').map(v => v.trim()).filter(v => v);
			}
		} else if (fieldValue) {
			termIds = [String(fieldValue)];
		}

		if (termIds.length === 0) {
			return;
		}

		// Update hidden input
		const hiddenInput = fieldWrapper.querySelector(`input[type="hidden"][name="${fieldName}"]`);
		if (hiddenInput) {
			hiddenInput.value = termIds.join(',');

			if (window.jvbTaxonomy) {
				requestAnimationFrame(() => {
					window.jvbTaxonomy.updateFieldFromInput(hiddenInput);
				});
			}

		}
	}

	/**
	 * Populate upload fields (images, videos, files)
	 */
	populateUploadField(fieldWrapper, fieldName, fieldValue) {
		// Check if this is a timeline gallery
		const isTimeline = fieldWrapper.dataset.subtype === 'timeline' || fieldName === 'timeline';

		if (isTimeline) {
			this.populateTimelineGallery(fieldWrapper, fieldName, fieldValue);
			return;
		}

		if (!fieldValue) {
			return;
		}

		// Handle comma-separated IDs or single ID
		const itemIds = this.splitIDs(fieldValue);
		if (itemIds.length === 0) {
			return;
		}

		// Update hidden input
		const hiddenInput = fieldWrapper.querySelector(`input[type="hidden"][name="${fieldName}"]`);
		if (hiddenInput) {
			hiddenInput.value = itemIds.join(',');
		}

		// Update display grid
		const grid = fieldWrapper.querySelector('.item-grid');
		const uploadContainer = fieldWrapper.querySelector('.file-upload-container');

		// Clear existing items first
		if (grid) {
			window.removeChildren(grid);
		}

		fieldWrapper.querySelector('.progress')?.remove();

		if (grid) {
			itemIds.forEach(itemId => {
				const template = window.getTemplate('uploadItem');
				if (!template) {
					console.warn('uploadItem template not found');
					return;
				}

				this.populateUploadItem(template, itemId);
				grid.append(template);
			});

			// Hide upload container if items exist
			if (itemIds.length > 0 && uploadContainer) {
				uploadContainer.hidden = true;
			}
		}
	}

	/**
	 * Populate a single upload item
	 */
	populateUploadItem(template, itemId) {
		let input = template.querySelector('input[name="select-item"]');
		let label = template.querySelector('label[for="select-item"]');

		template.dataset.id = itemId;
		input.name = `select-item-${itemId}`;
		input.id = input.name;
		label.htmlFor = input.name;

		const img = template.querySelector('img');
		template.querySelector('video')?.remove();

		// Populate with data from item.images
		if (this.item.images[itemId]) {
			const data = this.item.images[itemId];
			if (img) {
				img.src = data.medium || data.small || data.large || '';
				img.alt = data['image-alt-text'] || data.alt || '';
			}

			// Populate metadata fields
			const titleInput = template.querySelector('[name="image-title"]');
			const altInput = template.querySelector('[name="image-alt-text"]');
			const captionInput = template.querySelector('[name="image-caption"]');

			if (titleInput) titleInput.value = data['image-title'] || data.title || '';
			if (altInput) altInput.value = data['image-alt-text'] || data.alt || '';
			if (captionInput) captionInput.value = data['image-caption'] || data.caption || '';
		} else {
			console.warn(`No image data found for ID: ${itemId}`);
		}

		// Remove hint if present
		template.querySelector('details .upload-meta > .hint')?.remove();
	}

	/**
	 * Populate timeline gallery - FIXED iteration
	 */
	populateTimelineGallery(fieldWrapper, fieldName, fieldValue) {
		console.log('Populating Timeline Gallery', fieldValue);

		if (!fieldValue || !Array.isArray(fieldValue)) {
			console.warn('Timeline field value must be an array');
			return;
		}

		if (fieldValue.length === 0) {
			return;
		}

		const grid = fieldWrapper.querySelector('.item-grid');
		const uploadContainer = fieldWrapper.querySelector('.file-upload-container');

		// Clear existing items
		if (grid) {
			window.removeChildren(grid);
		}

		fieldWrapper.querySelector('.progress')?.remove();

		if (!grid) return;

		// FIX: Iterate directly over array, not Object.entries
		for (let itemData of fieldValue) {
			const template = window.getTemplate('timelineItem');
			if (!template) {
				console.warn('timelineItem template not found');
				continue;
			}

			const imageId = itemData.post_thumbnail;
			const postId = itemData.id;

			// Set template data attributes
			template.dataset.id = imageId;
			template.dataset.postId = postId;

			// Update selection controls
			let input = template.querySelector('input[name="select-item"]');
			let label = template.querySelector('label[for="select-item"]');
			if (input && label) {
				input.name = `select-item-${imageId}`;
				input.id = input.name;
				label.htmlFor = input.name;
			}

			// Remove unnecessary elements
			template.querySelector('video')?.remove();
			template.querySelector('.select-item span')?.remove();

			// Populate main image
			const img = template.querySelector('img');
			const imgData = this.item.images[imageId];
			if (img && imgData) {
				img.src = imgData.medium || imgData.small || imgData.large || '';
				img.title = imgData['image-title'] || '';
				img.alt = imgData['image-alt-text'] || '';
			}

			// Populate all fields within the template
			const fields = template.querySelectorAll('.field');
			fields.forEach(field => {
				if (field.classList.contains('group')) {
					return;
				}

				const input = field.querySelector('input:not([type="file"]), textarea');
				if (!input) return;

				const label = field.querySelector('label');
				const fieldName = input.name.replace('upload_data::', '').replace(/^\[.*?\]/, '');

				// Get value from itemData or imgData
				let value = itemData[fieldName];
				if (value === undefined && imgData) {
					value = imgData[fieldName];
				}

				// Populate the field using our standard method
				if (value !== undefined && value !== null) {
					this.populateField(field, fieldName, value);
				}

				// Update field identifiers to include post ID
				const newName = `[${postId}]${fieldName}`;
				const newId = newName;
				input.name = newName;
				input.id = newId;
				if (label) label.htmlFor = newId;
			});

			grid.append(template);
		}

		// Hide upload container if items exist
		if (fieldValue.length > 0 && uploadContainer) {
			uploadContainer.hidden = true;
		}
	}

	populateTextField(fieldWrapper, fieldName, fieldValue) {
		const input = fieldWrapper.querySelector(`[name="${fieldName}"], input, textarea`);
		if (input && input.type !== 'file') {
			input.value = String(fieldValue || '');

			if (input.dataset.limit) {
				const counter = fieldWrapper.querySelector('.char-count .current');
				if (counter) {
					counter.textContent = input.value.length;
				}
			}
		}
	}

	populateTextareaField(fieldWrapper, fieldName, fieldValue) {
		const textarea = fieldWrapper.querySelector(`textarea[name="${fieldName}"]`) ||
			fieldWrapper.querySelector('textarea:not([data-editor="true"])');

		if (textarea) {
			textarea.value = String(fieldValue || '');
			textarea.dispatchEvent(new Event('change', { bubbles: true }));

			if (textarea.dataset.limit) {
				const counter = fieldWrapper.querySelector('.char-count .current');
				if (counter) {
					counter.textContent = textarea.value.length;
					const limit = parseInt(textarea.dataset.limit, 10);
					fieldWrapper.classList.toggle('reached', textarea.value.length >= limit);
				}
			}
		}
	}

	populateEditorField(fieldWrapper, fieldName, fieldValue) {
		const textarea = fieldWrapper.querySelector(`textarea[name="${fieldName}"][data-editor="true"]`);
		if (!textarea) return;

		textarea.value = String(fieldValue || '');
		const editorContainer = fieldWrapper.querySelector('.editor');
		const content = fieldValue || '<p><br></p>';

		if (editorContainer) {
			let quillInstance = editorContainer.__quill;

			if (!quillInstance && window.Quill) {
				for (let instance of (window.Quill.instances || [])) {
					if (instance.container === editorContainer) {
						quillInstance = instance;
						break;
					}
				}
			}

			if (quillInstance) {
				quillInstance.root.innerHTML = content;
				editorContainer.__quill = quillInstance;
			} else {
				editorContainer.innerHTML = content;
			}
		}

		textarea.dispatchEvent(new Event('change', { bubbles: true }));
	}

	getFieldType(fieldWrapper) {
		if (fieldWrapper.dataset.fieldType) return fieldWrapper.dataset.fieldType;
		if (fieldWrapper.dataset.type) return fieldWrapper.dataset.type;

		const typeClasses = [
			'upload', 'repeater', 'taxonomy', 'user', 'location',
			'set', 'checkbox', 'select', 'radio', 'true_false', 'date',
			'time', 'datetime', 'editor', 'number', 'text', 'textarea',
			'email', 'url', 'tel', 'phone'
		];

		for (const type of typeClasses) {
			if (fieldWrapper.classList.contains(type)) {
				return type;
			}
		}

		const input = fieldWrapper.querySelector('input, select, textarea');
		if (input) {
			if (input.tagName === 'TEXTAREA') {
				return input.dataset.editor === 'true' ? 'editor' : 'textarea';
			}
			if (input.type) {
				return input.type === 'checkbox' && !fieldWrapper.classList.contains('true_false') ? 'set' : input.type;
			}
		}

		return 'text';
	}

	/**
	 * Populate number fields
	 */
	populateNumberField(fieldWrapper, fieldName, fieldValue) {
		const input = fieldWrapper.querySelector(`[name="${fieldName}"], input[type="number"]`);
		if (input) {
			input.value = Number(fieldValue) || 0;
		}
	}

	/**
	 * Populate boolean/true_false fields
	 */
	populateBooleanField(fieldWrapper, fieldName, fieldValue) {
		const input = fieldWrapper.querySelector(`[name="${fieldName}"], input[type="checkbox"]`);
		if (input) {
			input.checked = Boolean(fieldValue);
		}
	}

	/**
	 * Populate select/radio fields
	 */
	populateSelectField(fieldWrapper, fieldName, fieldValue) {
		const value = String(fieldValue || '');

		// Try select first
		const select = fieldWrapper.querySelector(`select[name="${fieldName}"]`);
		if (select) {
			select.value = value;
			return;
		}

		// Try radio buttons
		const radio = fieldWrapper.querySelector(`input[type="radio"][name="${fieldName}"][value="${value}"]`);
		if (radio) {
			radio.checked = true;
		}
	}

	/**
	 * Populate set/checkbox fields (multiple selections)
	 */
	populateSetField(fieldWrapper, fieldName, fieldValue) {
		// Parse value if it's a string
		let values = fieldValue;
		if (typeof fieldValue === 'string') {
			try {
				values = JSON.parse(fieldValue);
			} catch (e) {
				values = fieldValue.split(',').map(v => v.trim());
			}
		}

		if (!Array.isArray(values)) {
			values = [String(values)];
		}

		// Update checkboxes
		fieldWrapper.querySelectorAll(`input[type="checkbox"][name*="${fieldName}"]`).forEach(checkbox => {
			checkbox.checked = values.includes(checkbox.value);
		});
	}

	/**
	 * Populate date/time fields
	 */
	populateDateField(fieldWrapper, fieldName, fieldValue) {
		const input = fieldWrapper.querySelector(`[name="${fieldName}"], input`);
		if (input && fieldValue) {
			// Handle different date formats
			let dateValue = fieldValue;
			if (typeof fieldValue === 'object' && fieldValue.date) {
				dateValue = fieldValue.date;
			}

			// Convert to appropriate format for input type
			try {
				const date = new Date(dateValue);
				if (!isNaN(date.getTime())) {
					switch (input.type) {
						case 'date':
							input.value = date.toISOString().split('T')[0];
							break;
						case 'time':
							input.value = date.toTimeString().slice(0, 5);
							break;
						case 'datetime-local':
							input.value = date.toISOString().slice(0, 16);
							break;
						default:
							input.value = dateValue;
					}
				}
			} catch (e) {
				input.value = dateValue;
			}
		}
	}

	/**
	 * Populate location fields
	 */
	populateLocationField(fieldWrapper, fieldName, fieldValue) {
		if (!fieldValue || typeof fieldValue !== 'object') {
			return;
		}

		// Location fields typically have sub-fields
		const subFields = ['address', 'lat', 'lng', 'street', 'city', 'province', 'postal_code', 'country'];

		subFields.forEach(subField => {
			if (fieldValue[subField] !== undefined) {
				const input = fieldWrapper.querySelector(`[name="${fieldName}_${subField}"], [name="${subField}"]`);
				if (input) {
					input.value = String(fieldValue[subField] || '');
				}
			}
		});
	}


	/**
	 * Populate user fields (similar to taxonomy)
	 */
	populateUserField(fieldWrapper, fieldName, fieldValue) {
		// Similar logic to taxonomy fields
		this.populateTaxonomyField(fieldWrapper, fieldName, fieldValue);
	}

	/**
	 * Populate repeater fields
	 */
	populateRepeaterField(fieldWrapper, fieldName, fieldValue) {
		if (!fieldValue || !Array.isArray(fieldValue)) {
			return;
		}

		const container = fieldWrapper.querySelector('.repeater-items');
		const template = fieldWrapper.querySelector('template');

		if (!container || !template) {
			console.warn(`Repeater field ${fieldName}: missing container or template`);
			return;
		}

		// Clear existing rows
		window.removeChildren(container);

		// Create rows for each data item
		fieldValue.forEach((rowData, index) => {
			if (!rowData || typeof rowData !== 'object') {
				return;
			}

			const row = window.getTemplate(template.className);
			if (!row) {
				console.warn(`Repeater field ${fieldName}: template not found`);
				return;
			}

			// Set row ID and update row number
			row.id = `${fieldWrapper.closest('form').id}-${fieldName}-row-${index}`;
			row.dataset.index = index;

			const rowNumber = row.querySelector('.row-number');
			if (rowNumber) {
				rowNumber.textContent = `#${index + 1}`;
			}

			// Update field names and populate values
			row.querySelectorAll('input, select, textarea').forEach(field => {
				const originalName = field.name;
				const newName = `${fieldName}:${index}:${originalName}`;
				const newId = `${fieldName}-${index}-${originalName}-${field.value}`;

				// Update field identifiers
				field.name = newName;
				field.id = newId;

				// Update label
				const label = field.nextElementSibling;
				if (label && label.tagName === 'LABEL') {
					label.htmlFor = newId;
				}

				// Populate field value
				if (rowData[originalName] !== undefined) {
					this.populateRepeaterFieldValue(field, originalName, rowData[originalName]);
				}
			});

			container.appendChild(row);
		});
	}

	/**
	 * Populate individual repeater field value
	 */
	populateRepeaterFieldValue(field, fieldName, fieldValue) {
		switch (field.type) {
			case 'checkbox':
				field.checked = Boolean(fieldValue);
				break;
			case 'radio':
				field.checked = field.value === String(fieldValue);
				break;
			case 'select-one':
			case 'select-multiple':
				field.value = String(fieldValue || '');
				break;
			default:
				field.value = String(fieldValue || '');
		}
	}
}

// Make available globally
window.jvbPopulate = PopulateForm;