let selectedFiles = [];
let completedFiles = [];

// Constants
const MAX_AGE_DAYS = 2;
const MAX_AGE_MS = MAX_AGE_DAYS * 24 * 60 * 60 * 1000;

// Initialize the application
document.addEventListener('DOMContentLoaded', function () {
	cleanupOrphanedStorageEntries();
	setupEventListeners();
});

/**
 * Remove localStorage entries older than MAX_AGE_DAYS
 * This prevents orphaned entries from accumulating
 */
function cleanupOrphanedStorageEntries() {
	try {
		const storageData = JSON.parse(localStorage.getItem('uploadedFileData') || '{}');
		const now = Date.now();
		let cleaned = false;

		for (const id in storageData) {
			if (now - storageData[id].timestamp > MAX_AGE_MS) {
				delete storageData[id];
				cleaned = true;
			}
		}

		if (cleaned) {
			localStorage.setItem('uploadedFileData', JSON.stringify(storageData));
			console.log('Cleaned orphaned localStorage entries');
		}

		// Also clean legacy format if exists
		localStorage.removeItem('uploadedFileIds');
	} catch (e) {
		console.warn('Failed to cleanup localStorage:', e);
	}
}

function setupEventListeners() {
	const uploadSection = document.getElementById('upload-section');
	const fileInput = document.getElementById('file-input');
	const processButton = document.getElementById('process-button');
	const clearButton = document.getElementById('clear-button');
	const downloadButton = document.getElementById('download-button');

	// File upload events
	uploadSection.addEventListener('click', () => fileInput.click());
	uploadSection.addEventListener('dragover', handleDragOver);
	uploadSection.addEventListener('dragleave', handleDragLeave);
	uploadSection.addEventListener('drop', handleDrop);
	fileInput.addEventListener('change', handleFileSelect);

	// Button events
	processButton.addEventListener('click', processButtonFn);
	clearButton.addEventListener('click', clearAllFiles);
	downloadButton.addEventListener('click', downloadAllFiles);
}

function showMessage(message, type = 'error') {
	const errorMsg = document.getElementById('error-message');
	const successMsg = document.getElementById('success-message');

	// Hide both messages first
	errorMsg.style.display = 'none';
	successMsg.style.display = 'none';

	if (type === 'error') {
		errorMsg.textContent = message;
		errorMsg.style.display = 'block';
	} else {
		successMsg.textContent = message;
		successMsg.style.display = 'block';
	}

	// Auto-hide after 5 seconds
	setTimeout(() => {
		errorMsg.style.display = 'none';
		successMsg.style.display = 'none';
	}, 5000);
}

function handleDragOver(e) {
	e.preventDefault();
	e.currentTarget.classList.add('dragover');
}

function handleDragLeave(e) {
	e.preventDefault();
	e.currentTarget.classList.remove('dragover');
}

function handleDrop(e) {
	e.preventDefault();
	const uploadSection = e.currentTarget;
	uploadSection.classList.remove('dragover');

	const files = Array.from(e.dataTransfer.files);
	processFiles(files);
}

function handleFileSelect(e) {
	const files = Array.from(e.target.files);
	processFiles(files);
}

function generateUniqueId(file, length = 12) {
	let ext = "." + file.name.split(".")[file.name.split(".").length - 1]
	const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
	return Array.from({ length }, () => chars[Math.floor(Math.random() * chars.length)]).join('') + ext;
}

/**
 * Save file ID with timestamp to localStorage
 */
function saveFileIdToStorage(id) {
	const storageData = JSON.parse(localStorage.getItem('uploadedFileData') || '{}');
	if (!storageData[id]) {
		storageData[id] = {
			timestamp: Date.now()
		};
		localStorage.setItem('uploadedFileData', JSON.stringify(storageData));
	}
}

/**
 * Remove file ID from localStorage
 */
function removeFileIdFromStorage(id) {
	const storageData = JSON.parse(localStorage.getItem('uploadedFileData') || '{}');
	delete storageData[id];
	localStorage.setItem('uploadedFileData', JSON.stringify(storageData));
}

function processFiles(files) {
	files.forEach((file, index) => {
		const id = generateUniqueId(file); // generate unique ID
		const fileData = {
			id: id,
			file: file,
			name: file.name,
			size: formatFileSize(file.size),
			status: 'ready',
			preview: null
		};

		// Store file ID for potential server deletion later
		saveFileIdToStorage(id);

		// Create preview for images
		const reader = new FileReader();
		reader.onload = (e) => {
			fileData.preview = e.target.result;
			updateFileCard(fileData.id);
		};
		reader.readAsDataURL(file);

		selectedFiles.push(fileData);
	});

	updateUI();
}

function updateUI() {
	const filesPreview = document.getElementById('files-preview');
	const processButton = document.getElementById('process-button');

	if (selectedFiles.length > 0) {
		filesPreview.style.display = 'block';
		processButton.disabled = false;
		renderFileCards();
	} else {
		filesPreview.style.display = 'none';
		processButton.disabled = true;
	}
}

function renderFileCards() {
	const filesGrid = document.getElementById('files-grid');

	filesGrid.innerHTML = selectedFiles.map(file => {
		// Find completed file data for download URL
		const completedFile = completedFiles.find(cf => cf.id === file.id);
		// Check if metadata info exists and has content
		const hasMetadata = file.other_info && Object.keys(file.other_info).length > 0;
		// Calculate button positions based on page type
		const isMetadataPage = window.location.pathname == '/image/remove_metadata';
		const downloadTop = isMetadataPage ? '70px' : '40px';
		const viewTop = isMetadataPage ? '100px' : '70px';

		return `
        <div class="file-card" id="file-${file.id}">
            <button class="remove-button" onclick="removeFile('${file.id}')">×</button>
			${isMetadataPage && file.status === 'completed' ? `<button class="remove-button" style="top: 40px; background: #17a2b8;" onclick="showMetadata('${file.id}')" title="View removed metadata">i</button>` : ``}
			${file.status === 'error' && file.errorMessage ? `<button class="remove-button" style="top: 40px; background: #dc3545;" onclick="showError('${file.id}')" title="View error">!</button>` : ``}
			${file.status === 'completed' && completedFile ? `<button class="remove-button" style="top: ${downloadTop}; background: #28a745;" onclick="downloadFile('${file.id}')" title="Download">⬇</button>` : ``}
			${file.status === 'completed' && completedFile ? `<button class="remove-button" style="top: ${viewTop}; background: #6f42c1;" onclick="viewImage('${file.id}')" title="View image">👁</button>` : ``}
            
            <div class="file-preview">
                ${file.preview ? `<img src="${file.preview}" alt="${file.name}">` : '<span class="file-icon">🖼️</span>'}
            </div>
            
            <div class="file-info">
                <h4>${file.name}</h4>
                <p>${file.size}</p>
                
                <div class="file-status">
                    <div class="status-indicator ${file.status === 'processing' ? 'processing' : file.status === 'error' ? 'error' : file.status === 'completed' ? 'completed' : ''}"></div>
                    <span>${getStatusText(file.status)}</span>
                </div>
            </div>
        </div>
    `;
	}).join('');
}

function updateFileCard(fileId) {
	const file = selectedFiles.find(f => f.id === fileId);
	if (!file) return;

	const card = document.getElementById(`file-${fileId}`);
	if (!card) return;

	const preview = card.querySelector('.file-preview');
	if (file.preview && preview) {
		preview.innerHTML = `<img src="${file.preview}" alt="${file.name}">`;
	}
}

async function processButtonFn() {
	if (selectedFiles.length === 0) return;

	const progressSection = document.getElementById('progress-section');
	const progressBar = document.getElementById('progress-bar');
	const progressText = document.getElementById('progress-text');
	const processButton = document.getElementById('process-button');

	// Show progress section
	progressSection.style.display = 'block';
	processButton.disabled = true;
	const old_message = processButton.innerHTML;
	processButton.innerHTML = '🔄 Processing...';
	const settings = getSettingsData();
	completedFiles = [];

	for (let i = 0; i < selectedFiles.length; i++) {
		const file = selectedFiles[i];

		// Update file status
		file.status = 'uploading';
		renderFileCards();

		try {
			// Upload and process the file
			await upload(file);
			file.status = 'processing';
			renderFileCards();
			const processedFile = await secret_sauce(file, settings);
			file.status = 'completed';
			file.other_info = processedFile.other_info;
			renderFileCards();
			completedFiles.push(processedFile);
		} catch (error) {
			console.error('Processing error:', error);
			file.status = 'error';
			file.errorMessage = error.message;
			showMessage(`Error processing ${file.name}: ${error.message}`, 'error');
		}

		// Update progress
		const progress = Math.round(((i + 1) / selectedFiles.length) * 100);
		progressBar.style.width = progress + '%';
		progressText.textContent = `${progress}% complete (${i + 1}/${selectedFiles.length})`;

		renderFileCards();
	}

	// Completion
	processButton.disabled = false;
	processButton.innerHTML = old_message;

	const successfulProcessing = completedFiles.length;
	if (successfulProcessing > 0) {
		document.getElementById('download-button').style.display = 'inline-flex';
		showMessage(`Successfully processed ${successfulProcessing} image(s)!`, 'success');
	}

	setTimeout(() => {
		progressSection.style.display = 'none';
	}, 1000);
}

async function secret_sauce(file, settings) {
	const formData = new FormData();
	formData.append('id', file.id);
	for (let key of Object.keys(settings)) {
		if (settings[key]) {
			formData.append('to_format', settings[key]);
		}
	}

	try {
		const response = await fetch(secret_sauce_url(), {
			method: 'POST',
			body: formData
		});

		if (!response.ok) {
			const errorData = await response.json().catch(() => ({}));
			throw new Error(errorData.message || `HTTP error! status: ${response.status}`);
		}

		const result = await response.json();

		return {
			id: file.id,
			originalName: file.name,
			processedName: result.new_filename,
			url: "/image/download?id=" + result.new_filename,
			other_info: result.other_info
		};
	} catch (error) {
		throw new Error(`Failed to process ${file.name}: ${error.message}`);
	}
}

function downloadAllFiles() {
	if (completedFiles.length === 0) return;

	// Download each completedFiles file
	completedFiles.forEach((file, index) => {
		setTimeout(() => {
			const link = document.createElement('a');
			link.href = file.url;
			link.download = file.processedName;
			link.target = '_blank';
			document.body.appendChild(link);
			link.click();
			document.body.removeChild(link);
		}, index * 100);
	});
}

function formatFileSize(bytes) {
	if (bytes === 0) return '0 Bytes';
	const k = 1024;
	const sizes = ['Bytes', 'KB', 'MB', 'GB'];
	const i = Math.floor(Math.log(bytes) / Math.log(k));
	return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

function removeFile(fileId) {
	selectedFiles = selectedFiles.filter(file => file.id !== fileId);
	completedFiles = completedFiles.filter(file => file.id !== fileId);
	removeFileIdFromStorage(fileId);
	updateUI();

	if (selectedFiles.length === 0) {
		document.getElementById('download-button').style.display = 'none';
	}
}

async function clearAllFiles() {
	const storageData = JSON.parse(localStorage.getItem('uploadedFileData') || '{}');
	const fileIds = Object.keys(storageData);

	if (fileIds.length > 0) {
		try {
			await fetch('/image/delete', {
				method: 'POST',
				headers: {
					'Content-Type': 'application/json'
				},
				body: JSON.stringify({ ids: fileIds })
			});
		} catch (err) {
			console.error('Error sending delete request:', err);
		}
	}

	// Clear everything locally
	selectedFiles = [];
	completedFiles = [];
	updateUI();
	document.getElementById('download-button').style.display = 'none';
	document.getElementById('progress-section').style.display = 'none';
	localStorage.removeItem('uploadedFileData');
}

async function upload(file) {
	const formData = new FormData();
	formData.append('image', file.file);
	formData.append('id', file.id);

	try {
		const response = await fetch('/image/upload', {
			method: 'POST',
			body: formData
		});

		if (!response.ok) {
			const errorData = await response.json().catch(() => ({}));
			throw new Error(errorData.message || `HTTP error! status: ${response.status}`);
		}
		return true;
	} catch (error) {
		throw new Error(`Failed to upload ${file.name}: ${error.message}`);
	}
}

function getSettingsData() {
	return {
		to_format: document.getElementById('output-format')?.value
	};
}

function getStatusText(status) {
	switch (status) {
		case 'ready': return 'Ready';
		case 'uploading': return 'Uploading...';
		case 'processing': return window.location.pathname == '/image/remove_metadata' ? 'Removing metadata...' : 'Converting...';
		case 'completed': return 'Processed';
		case 'error': return 'Error';
		default: return 'Unknown';
	}
}
function showMetadata(fileId) {
	const file = selectedFiles.find(f => f.id === fileId);
	const contentEl = document.getElementById('metadata-content');
	if (file && file.other_info) {
		contentEl.textContent = JSON.stringify(file.other_info, null, 2);
		document.getElementById('metadata-modal').style.display = 'block';
		document.getElementById('modal-backdrop').style.display = 'block';
	} else {
		contentEl.textContent = 'No metadata removed or unavailable.';
		document.getElementById('metadata-modal').style.display = 'block';
		document.getElementById('modal-backdrop').style.display = 'block';
	}
}

function closeMetadataModal() {
	document.getElementById('metadata-modal').style.display = 'none';
	document.getElementById('modal-backdrop').style.display = 'none';
}

/**
 * Show error message for a file in a modal/alert
 */
function showError(fileId) {
	const file = selectedFiles.find(f => f.id === fileId);
	if (file && file.errorMessage) {
		// Use showMessage which displays at the top of the page
		showMessage(`Error: ${file.errorMessage}`, 'error');
	} else {
		showMessage('Unknown error occurred', 'error');
	}
}

/**
 * Download a single processed file
 */
function downloadFile(fileId) {
	const completedFile = completedFiles.find(f => f.id === fileId);
	if (completedFile) {
		const link = document.createElement('a');
		link.href = completedFile.url;
		link.download = completedFile.processedName;
		link.target = '_blank';
		document.body.appendChild(link);
		link.click();
		document.body.removeChild(link);
	}
}

/**
 * View the processed image in a modal popup
 */
function viewImage(fileId) {
	const completedFile = completedFiles.find(f => f.id === fileId);
	if (completedFile) {
		// Create modal if it doesn't exist
		let modal = document.getElementById('image-view-modal');
		let backdrop = document.getElementById('image-view-backdrop');

		if (!modal) {
			// Create backdrop
			backdrop = document.createElement('div');
			backdrop.id = 'image-view-backdrop';
			backdrop.style.cssText = 'position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); z-index: 9998; display: none;';
			backdrop.onclick = closeImageModal;
			document.body.appendChild(backdrop);

			// Create modal
			modal = document.createElement('div');
			modal.id = 'image-view-modal';
			modal.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 9999; display: none; max-width: 90%; max-height: 90%; background: white; border-radius: 10px; padding: 10px; box-shadow: 0 0 30px rgba(0,0,0,0.5);';
			modal.innerHTML = `
				<button onclick="closeImageModal()" style="position: absolute; top: -10px; right: -10px; width: 30px; height: 30px; border-radius: 50%; border: none; background: #dc3545; color: white; font-size: 18px; cursor: pointer; z-index: 10000;">×</button>
				<img id="image-view-content" style="max-width: 80vw; max-height: 80vh; display: block; border-radius: 5px;" />
			`;
			document.body.appendChild(modal);
		}

		// Show modal with image
		document.getElementById('image-view-content').src = completedFile.url;
		modal.style.display = 'block';
		backdrop.style.display = 'block';
	}
}

/**
 * Close image view modal
 */
function closeImageModal() {
	const modal = document.getElementById('image-view-modal');
	const backdrop = document.getElementById('image-view-backdrop');
	if (modal) modal.style.display = 'none';
	if (backdrop) backdrop.style.display = 'none';
}