Implement enhanced loading progress display in DownloadManager and ImportManager. Introduce detailed progress updates and UI elements for current item and overall progress during downloads. Update LoadingManager to support dynamic progress visualization.

static/js/managers/LoadingManager.js

@@ -4,17 +4,22 @@ export class LoadingManager {
         this.overlay = document.getElementById('loading-overlay');
         this.progressBar = this.overlay.querySelector('.progress-bar');
         this.statusText = this.overlay.querySelector('.loading-status');
+        this.detailsContainer = null; // Will be created when needed
     }
 
     show(message = 'Loading...', progress = 0) {
         this.overlay.style.display = 'flex';
         this.setProgress(progress);
         this.setStatus(message);
+        
+        // Remove any existing details container
+        this.removeDetailsContainer();
     }
 
     hide() {
         this.overlay.style.display = 'none';
         this.reset();
+        this.removeDetailsContainer();
     }
 
     setProgress(percent) {
@@ -29,6 +34,101 @@ export class LoadingManager {
     reset() {
         this.setProgress(0);
         this.setStatus('');
+        this.removeDetailsContainer();
+    }
+
+    // Create a details container for enhanced progress display
+    createDetailsContainer() {
+        // Remove existing container if any
+        this.removeDetailsContainer();
+        
+        // Create new container
+        this.detailsContainer = document.createElement('div');
+        this.detailsContainer.className = 'progress-details-container';
+        
+        // Insert after the main progress bar
+        const loadingContent = this.overlay.querySelector('.loading-content');
+        if (loadingContent) {
+            loadingContent.appendChild(this.detailsContainer);
+        }
+        
+        return this.detailsContainer;
+    }
+    
+    // Remove details container
+    removeDetailsContainer() {
+        if (this.detailsContainer) {
+            this.detailsContainer.remove();
+            this.detailsContainer = null;
+        }
+    }
+    
+    // Show enhanced progress for downloads
+    showDownloadProgress(totalItems = 1) {
+        this.show('Preparing download...', 0);
+        
+        // Create details container
+        const detailsContainer = this.createDetailsContainer();
+        
+        // Create current item progress
+        const currentItemContainer = document.createElement('div');
+        currentItemContainer.className = 'current-item-progress';
+        
+        const currentItemLabel = document.createElement('div');
+        currentItemLabel.className = 'current-item-label';
+        currentItemLabel.textContent = 'Current file:';
+        
+        const currentItemBar = document.createElement('div');
+        currentItemBar.className = 'current-item-bar-container';
+        
+        const currentItemProgress = document.createElement('div');
+        currentItemProgress.className = 'current-item-bar';
+        currentItemProgress.style.width = '0%';
+        
+        const currentItemPercent = document.createElement('span');
+        currentItemPercent.className = 'current-item-percent';
+        currentItemPercent.textContent = '0%';
+        
+        currentItemBar.appendChild(currentItemProgress);
+        currentItemContainer.appendChild(currentItemLabel);
+        currentItemContainer.appendChild(currentItemBar);
+        currentItemContainer.appendChild(currentItemPercent);
+        
+        // Create overall progress elements if multiple items
+        let overallLabel = null;
+        if (totalItems > 1) {
+            overallLabel = document.createElement('div');
+            overallLabel.className = 'overall-progress-label';
+            overallLabel.textContent = `Overall progress (0/${totalItems} complete):`;
+            detailsContainer.appendChild(overallLabel);
+        }
+        
+        // Add current item progress to container
+        detailsContainer.appendChild(currentItemContainer);
+        
+        // Return update function
+        return (currentProgress, currentIndex = 0, currentName = '') => {
+            // Update current item progress
+            currentItemProgress.style.width = `${currentProgress}%`;
+            currentItemPercent.textContent = `${Math.floor(currentProgress)}%`;
+            
+            // Update current item label if name provided
+            if (currentName) {
+                currentItemLabel.textContent = `Downloading: ${currentName}`;
+            }
+            
+            // Update overall label if multiple items
+            if (totalItems > 1 && overallLabel) {
+                overallLabel.textContent = `Overall progress (${currentIndex}/${totalItems} complete):`;
+                
+                // Calculate and update overall progress
+                const overallProgress = Math.floor((currentIndex + currentProgress/100) / totalItems * 100);
+                this.setProgress(overallProgress);
+            } else {
+                // Single item, just update main progress
+                this.setProgress(currentProgress);
+            }
+        };
     }
 
     async showWithProgress(callback, options = {}) {