{% extends "base.html" %}

{% block title %}Upload Files - Flask Files{% endblock %}

{% block extra_css %}
<link rel="stylesheet" href="{{ url_for('static', filename='css/upload.css') }}">
{% endblock %}

{% block content %}
<section class="upload-container">
    <div class="upload-header">
        <h2>Upload Files</h2>
        <div class="upload-location">
            <span>Uploading to:</span>
            {% if parent_folder %}
            <a href="{{ url_for('files.browser', folder_id=parent_folder.id) }}">{{ parent_folder.name }}</a>
            {% else %}
            <a href="{{ url_for('files.browser') }}">Root</a>
            {% endif %}
        </div>
    </div>

    <div class="upload-dropzone" id="dropzone">
        <div class="upload-icon-wrapper">
            <i class="fas fa-cloud-upload-alt upload-icon"></i>
        </div>
        <div class="upload-text">
            <p class="upload-primary-text">Drag & drop files or folders here</p>
            <p class="upload-secondary-text">or</p>
            <div class="upload-buttons">
                <label class="btn primary">
                    <i class="fas fa-file"></i> Select Files
                    <input type="file" name="files[]" multiple id="file-input" style="display: none">
                </label>
                <label class="btn">
                    <i class="fas fa-folder"></i> Select Folder
                    <input type="file" name="folders[]" webkitdirectory directory id="folder-input"
                        style="display: none">
                </label>
            </div>
            <p class="upload-hint">Files will upload automatically when dropped or selected</p>
        </div>
    </div>

    <div class="upload-progress-container" id="progress-container" style="display: none;">
        <h3>Upload Progress</h3>
        <div class="progress-overall">
            <div class="progress-header">
                <span>Overall Progress</span>
                <span id="progress-percentage">0%</span>
            </div>
            <div class="progress-bar-container">
                <div class="progress-bar" id="progress-bar"></div>
            </div>
        </div>

        <div class="upload-stats">
            <div class="stat-item">
                <i class="fas fa-tachometer-alt"></i>
                <span id="upload-speed">0 KB/s</span>
            </div>
            <div class="stat-item">
                <i class="fas fa-file-upload"></i>
                <span id="uploaded-size">0 KB / 0 KB</span>
            </div>
            <div class="stat-item">
                <i class="fas fa-clock"></i>
                <span id="time-remaining">calculating...</span>
            </div>
        </div>
    </div>

    <div class="upload-list" id="upload-list">
        <h3>Files (<span id="file-count">0</span>)</h3>
        <div id="file-items" class="file-items"></div>
        <div id="empty-message" class="empty-message">
            <p>No files selected yet</p>
        </div>
    </div>

    <div class="upload-actions">
        <a href="{{ url_for('files.browser', folder_id=parent_folder.id if parent_folder else None) }}" class="btn">
            Cancel
        </a>
        <button id="clear-button" class="btn" disabled>Clear All</button>
    </div>
</section>
{% endblock %}

{% block extra_js %}
<script>
    document.addEventListener('DOMContentLoaded', function () {
        // DOM Elements
        const dropzone = document.getElementById('dropzone');
        const fileInput = document.getElementById('file-input');
        const folderInput = document.getElementById('folder-input');
        const uploadList = document.getElementById('file-items');
        const emptyMessage = document.getElementById('empty-message');
        const fileCount = document.getElementById('file-count');
        const progressContainer = document.getElementById('progress-container');
        const progressBar = document.getElementById('progress-bar');
        const progressPercentage = document.getElementById('progress-percentage');
        const uploadSpeed = document.getElementById('upload-speed');
        const uploadedSize = document.getElementById('uploaded-size');
        const timeRemaining = document.getElementById('time-remaining');
        const clearButton = document.getElementById('clear-button');

        // Upload tracking
        let uploadQueue = [];
        let currentUploads = 0;
        let totalUploaded = 0;
        let totalSize = 0;
        let uploadStartTime = 0;
        let lastUploadedBytes = 0;
        let uploadUpdateInterval = null;
        const MAX_CONCURRENT_UPLOADS = 3;
        const folderId = {{ parent_folder.id if parent_folder else 'null' }
    };

    // Setup event listeners
    dropzone.addEventListener('dragover', function (e) {
        e.preventDefault();
        this.classList.add('highlight');
    });

    dropzone.addEventListener('dragleave', function (e) {
        e.preventDefault();
        this.classList.remove('highlight');
    });

    dropzone.addEventListener('drop', function (e) {
        e.preventDefault();
        this.classList.remove('highlight');

        // Handle dropped files
        const items = e.dataTransfer.items;
        if (items && items.length > 0) {
            // Check if this is a folder drop from file explorer
            const containsDirectories = Array.from(items).some(item => {
                return item.webkitGetAsEntry && item.webkitGetAsEntry().isDirectory;
            });

            if (containsDirectories) {
                processDroppedItems(items);
            } else {
                handleFiles(e.dataTransfer.files);
            }
        }
    });

    fileInput.addEventListener('change', function () {
        handleFiles(this.files);
    });

    folderInput.addEventListener('change', function () {
        handleFolderUpload(this.files);
    });

    clearButton.addEventListener('click', function () {
        resetUploadState();
    });

    function processDroppedItems(items) {
        const fileList = [];
        let pendingDirectories = 0;

        function traverseFileTree(entry, path = '') {
            if (entry.isFile) {
                entry.file(file => {
                    file.relativePath = path + file.name;
                    fileList.push(file);
                    if (pendingDirectories === 0 && entry.isFile) {
                        handleFiles(fileList);
                    }
                });
            } else if (entry.isDirectory) {
                pendingDirectories++;
                const dirReader = entry.createReader();
                const readEntries = () => {
                    dirReader.readEntries(entries => {
                        if (entries.length > 0) {
                            for (let i = 0; i < entries.length; i++) {
                                traverseFileTree(entries[i], path + entry.name + '/');
                            }
                            readEntries(); // Continue reading if there might be more entries
                        } else {
                            pendingDirectories--;
                            if (pendingDirectories === 0) {
                                handleFiles(fileList);
                            }
                        }
                    });
                };
                readEntries();
            }
        }

        for (let i = 0; i < items.length; i++) {
            const entry = items[i].webkitGetAsEntry();
            if (entry) {
                traverseFileTree(entry);
            }
        }
    }

    function handleFiles(files) {
        if (!files || files.length === 0) return;

        clearButton.disabled = false;
        emptyMessage.style.display = 'none';

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

            // Add to queue
            uploadQueue.push({
                file: file,
                relativePath: file.relativePath || null,
                status: 'queued',
                progress: 0
            });

            totalSize += file.size;

            // Add to UI
            const fileItem = document.createElement('div');
            fileItem.className = 'file-item';
            fileItem.dataset.index = uploadQueue.length - 1;

            // Determine icon based on file type
            const fileIcon = getFileIcon(file.name);

            fileItem.innerHTML = `
                <div class="file-icon">
                    <i class="fas ${fileIcon}"></i>
                </div>
                <div class="file-info">
                    <div class="file-name">${file.name}</div>
                    <div class="file-path">${file.relativePath || 'No path'}</div>
                    <div class="file-size">${formatSize(file.size)}</div>
                    <div class="file-progress">
                        <div class="progress-bar-small" style="width: 0%"></div>
                    </div>
                </div>
                <div class="file-status">
                    <span class="status-indicator queued">Queued</span>
                </div>
            `;

            uploadList.appendChild(fileItem);
        }

        fileCount.textContent = uploadQueue.length;

        // Start upload process
        startUpload();
    }

    function handleFolderUpload(files) {
        if (!files || files.length === 0) return;

        const fileArray = Array.from(files);
        for (let i = 0; i < fileArray.length; i++) {
            const file = fileArray[i];
            file.relativePath = file.webkitRelativePath;
        }

        handleFiles(fileArray);
    }

    function startUpload() {
        if (uploadQueue.length === 0 || currentUploads >= MAX_CONCURRENT_UPLOADS) return;

        if (currentUploads === 0) {
            // First upload - initialize tracking
            uploadStartTime = Date.now();
            lastUploadedBytes = 0;
            progressContainer.style.display = 'block';

            // Start progress update interval
            uploadUpdateInterval = setInterval(updateUploadStats, 500);
        }

        // Find next queued file
        const nextIndex = uploadQueue.findIndex(item => item.status === 'queued');
        if (nextIndex === -1) return;

        // Start uploading this file
        uploadQueue[nextIndex].status = 'uploading';
        currentUploads++;

        // Update UI
        const fileItem = document.querySelector(`.file-item[data-index="${nextIndex}"]`);
        const statusIndicator = fileItem.querySelector('.status-indicator');
        statusIndicator.className = 'status-indicator uploading';
        statusIndicator.textContent = 'Uploading';

        // Create FormData
        const formData = new FormData();
        formData.append('file', uploadQueue[nextIndex].file);
        formData.append('folder_id', folderId || '');

        if (uploadQueue[nextIndex].relativePath) {
            formData.append('relative_path', uploadQueue[nextIndex].relativePath);
        }

        // Create and configure XHR
        const xhr = new XMLHttpRequest();

        xhr.upload.addEventListener('progress', function (e) {
            if (e.lengthComputable) {
                const percentComplete = Math.round((e.loaded / e.total) * 100);

                // Update file progress
                uploadQueue[nextIndex].progress = percentComplete;

                // Update file UI
                const progressBar = fileItem.querySelector('.progress-bar-small');
                progressBar.style.width = percentComplete + '%';
            }
        });

        xhr.addEventListener('load', function () {
            if (xhr.status === 200) {
                try {
                    const response = JSON.parse(xhr.responseText);

                    if (response.success) {
                        // Upload successful
                        uploadQueue[nextIndex].status = 'complete';
                        statusIndicator.className = 'status-indicator complete';
                        statusIndicator.textContent = 'Complete';

                        totalUploaded += uploadQueue[nextIndex].file.size;
                    } else {
                        // Upload failed on server
                        uploadQueue[nextIndex].status = 'error';
                        statusIndicator.className = 'status-indicator error';
                        statusIndicator.textContent = 'Error: ' + (response.error || 'Server Error');
                    }
                } catch (e) {
                    // JSON parse error
                    uploadQueue[nextIndex].status = 'error';
                    statusIndicator.className = 'status-indicator error';
                    statusIndicator.textContent = 'Error: Invalid response';
                }
            } else {
                // HTTP error
                uploadQueue[nextIndex].status = 'error';
                statusIndicator.className = 'status-indicator error';
                statusIndicator.textContent = 'Error: ' + xhr.status;
            }

            // One upload completed
            currentUploads--;

            // Check if all uploads complete
            if (uploadQueue.every(item => item.status !== 'queued' && item.status !== 'uploading')) {
                // All uploads complete
                clearInterval(uploadUpdateInterval);

                // Show completion notification
                const successCount = uploadQueue.filter(item => item.status === 'complete').length;
                const errorCount = uploadQueue.filter(item => item.status === 'error').length;

                // Show notification message
                if (errorCount === 0) {
                    showNotification(`Successfully uploaded ${successCount} files`, 'success');
                } else {
                    showNotification(`Uploaded ${successCount} files, ${errorCount} failed`, 'warning');
                }
            } else {
                // Start next upload
                startUpload();
            }
        });

        xhr.addEventListener('error', function () {
            // Network error
            uploadQueue[nextIndex].status = 'error';
            statusIndicator.className = 'status-indicator error';
            statusIndicator.textContent = 'Error: Network error';

            currentUploads--;
            startUpload(); // Try the next file
        });

        // Send the request
        xhr.open('POST', '/files/upload_file');
        xhr.send(formData);

        // Try to start more uploads if possible
        startUpload();
    }

    function updateUploadStats() {
        if (currentUploads === 0) return;

        // Calculate overall progress
        let totalProgress = 0;

        uploadQueue.forEach(item => {
            if (item.status === 'complete') {
                totalProgress += item.file.size;
            } else if (item.status === 'uploading') {
                totalProgress += (item.file.size * (item.progress / 100));
            }
        });

        const overallPercentage = Math.round((totalProgress / totalSize) * 100);

        // Update progress bar
        progressBar.style.width = overallPercentage + '%';
        progressPercentage.textContent = overallPercentage + '%';

        // Calculate upload speed
        const elapsed = (Date.now() - uploadStartTime) / 1000; // seconds
        const bytesPerSecond = totalProgress / elapsed;

        uploadSpeed.textContent = formatSize(bytesPerSecond) + '/s';

        // Update uploaded size
        uploadedSize.textContent = `${formatSize(totalProgress)} / ${formatSize(totalSize)}`;

        // Calculate time remaining
        const remainingBytes = totalSize - totalProgress;
        if (bytesPerSecond > 0) {
            const secondsRemaining = Math.round(remainingBytes / bytesPerSecond);
            timeRemaining.textContent = formatTime(secondsRemaining);
        } else {
            timeRemaining.textContent = 'calculating...';
        }
    }

    function resetUploadState() {
        // Reset all upload tracking variables
        uploadQueue = [];
        currentUploads = 0;
        totalUploaded = 0;
        totalSize = 0;
        clearInterval(uploadUpdateInterval);

        // Reset UI
        uploadList.innerHTML = '';
        emptyMessage.style.display = 'block';
        progressContainer.style.display = 'none';
        fileCount.textContent = '0';
        progressBar.style.width = '0%';
        progressPercentage.textContent = '0%';
        uploadSpeed.textContent = '0 KB/s';
        uploadedSize.textContent = '0 KB / 0 KB';
        timeRemaining.textContent = 'calculating...';
        clearButton.disabled = true;
    }

    function showNotification(message, type) {
        // Create alerts container if it doesn't exist
        let alertsContainer = document.querySelector('.alerts');
        if (!alertsContainer) {
            alertsContainer = document.createElement('div');
            alertsContainer.className = 'alerts';
            document.body.appendChild(alertsContainer);
        }

        // Create alert
        const alert = document.createElement('div');
        alert.className = `alert ${type || 'info'}`;
        alert.innerHTML = `
            <div class="alert-content">${message}</div>
            <button class="close" aria-label="Close">&times;</button>
        `;

        // Add to container
        alertsContainer.appendChild(alert);

        // Setup dismiss
        const closeBtn = alert.querySelector('.close');
        closeBtn.addEventListener('click', function () {
            alert.classList.add('fade-out');
            setTimeout(() => {
                alert.remove();
            }, 300);
        });

        // Auto dismiss
        setTimeout(() => {
            if (alert.parentNode) {
                alert.classList.add('fade-out');
                setTimeout(() => {
                    if (alert.parentNode) {
                        alert.remove();
                    }
                }, 300);
            }
        }, 5000);
    }

    function formatSize(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 formatTime(seconds) {
        if (seconds < 60) {
            return seconds + ' seconds';
        } else if (seconds < 3600) {
            return Math.floor(seconds / 60) + ' minutes';
        } else {
            const hours = Math.floor(seconds / 3600);
            const minutes = Math.floor((seconds % 3600) / 60);
            return hours + ' hours ' + minutes + ' minutes';
        }
    }

    function getFileIcon(fileName) {
        const extension = fileName.split('.').pop().toLowerCase();

        // Images
        if (['jpg', 'jpeg', 'png', 'gif', 'bmp', 'svg', 'webp'].includes(extension)) {
            return 'fa-file-image';
        }
        // Videos
        else if (['mp4', 'avi', 'mov', 'wmv', 'flv', 'mkv', 'webm'].includes(extension)) {
            return 'fa-file-video';
        }
        // Audio
        else if (['mp3', 'wav', 'ogg', 'flac', 'm4a'].includes(extension)) {
            return 'fa-file-audio';
        }
        // Documents
        else if (['doc', 'docx', 'dot', 'dotx'].includes(extension)) {
            return 'fa-file-word';
        }
        else if (['xls', 'xlsx', 'csv'].includes(extension)) {
            return 'fa-file-excel';
        }
        else if (['ppt', 'pptx'].includes(extension)) {
            return 'fa-file-powerpoint';
        }
        else if (['pdf'].includes(extension)) {
            return 'fa-file-pdf';
        }
        // Archives
        else if (['zip', 'rar', '7z', 'tar', 'gz', 'bz2'].includes(extension)) {
            return 'fa-file-archive';
        }
        // Text
        else if (['txt', 'rtf', 'md', 'log'].includes(extension)) {
            return 'fa-file-alt';
        }
        // Code
        else if (['html', 'css', 'js', 'php', 'py', 'java', 'c', 'cpp', 'h', 'xml', 'json', 'sql'].includes(extension)) {
            return 'fa-file-code';
        }

        return 'fa-file';
    }
});
</script>
{% endblock %}