Refine Photo Picker Session UI and Logic

- Unified transfer session UI layout with instructions at the top and footer controls.
- Implemented side-by-side 'Re-open Popup' and 'Cancel' buttons with proper state management (disabled/enabled).
- Added dynamic service context to instructions (e.g., 'Importing from Google Photos').
- Refactored UI class to handle new DOM structure and button logic.
- Updated controller to support new UI interactions and improved cancellation flow.

src/MediaManager.html

@@ -439,14 +439,44 @@
       width: 6px;
     }
 
-    .log-content::-webkit-scrollbar-track {
-      background: transparent;
-    }
-
     .log-content::-webkit-scrollbar-thumb {
       background: #cbd5e1;
       border-radius: 3px;
     }
+
+    /* Transfer Session UI */
+    .transfer-session {
+      margin-top: 12px;
+      padding: 16px;
+      background: #f8fafc;
+      border: 1px solid var(--border);
+      border-radius: 8px;
+    }
+
+    .progress-track {
+      width: 100%;
+      height: 8px;
+      background: #e2e8f0;
+      border-radius: 4px;
+      overflow: hidden;
+      margin-top: 8px;
+    }
+
+    .progress-fill {
+      height: 100%;
+      background: var(--primary);
+      width: 0%;
+      transition: width 0.3s ease;
+    }
+
+    .transfer-footer {
+      display: flex;
+      gap: 8px;
+      justify-content: flex-end;
+      margin-top: 16px;
+      padding-top: 12px;
+      border-top: 1px solid #f1f5f9;
+    }
   </style>
 </head>
 
@@ -530,21 +560,36 @@
           </button>
         </div>
         <input type="file" id="file-input" multiple style="display:none" onchange="controller.handleFiles(this.files)">
-      </div>
+<!-- Unified Transfer Session UI -->
+<div id="transfer-session-ui" class="transfer-session" style="display:none;">
+  <!-- Instructions (Top) -->
+  <div id="transfer-desc" style="font-size:13px; color:var(--text); margin-bottom:12px; line-height:1.4;">
+    <!-- Dynamic Helper Text -->
+  </div>
 
-      <!-- Photos Session UI -->
-      <div id="photos-session-ui"
-        style="display:none; margin-top:12px; padding:12px; background:#f0f9ff; border-radius:8px; border:1px solid #bae6fd;">
-        <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:4px;">
-          <span style="font-weight:600; font-size:12px; color:#0369a1;">Photo Picker Session</span>
-          <button onclick="ui.closePhotoSession()"
-            style="background:none; border:none; color:#0369a1; cursor:pointer; font-size:16px;">×</button>
-        </div>
-        <a id="photos-session-link" href="#" target="_blank" class="btn"
-          style="background:#0ea5e9; text-decoration:none; margin-bottom:8px;">
-          Open Google Photos ↗
-        </a>
-        <div id="photos-session-status" style="font-size:11px; color:#64748b; text-align:center;">Initializing...</div>
+  <!-- Progress Section (Middle) -->
+  <div id="transfer-progress-container">
+    <div
+      style="display:flex; justify-content:space-between; font-size:11px; color:var(--text-secondary); margin-bottom: 4px;">
+      <span id="transfer-status-text">Processing...</span>
+      <span id="transfer-count"></span>
+    </div>
+    <div class="progress-track">
+      <div id="transfer-progress-bar" class="progress-fill"></div>
+    </div>
+    </div>
+    
+    <!-- Footer Buttons (Bottom) -->
+    <div class="transfer-footer">
+      <button id="btn-transfer-reopen" class="btn btn-secondary" style="font-size:12px;" disabled>
+        Re-open Popup ↗
+      </button>
+      <button id="btn-transfer-cancel" onclick="controller.cancelTransfer()" class="btn btn-secondary"
+        style="font-size:12px;">
+        Cancel
+      </button>
+    </div>
+    </div>
       </div>
     </div>
     <!-- Permanent Log Card -->
@@ -820,42 +865,81 @@
       this.saveBtn.innerText = enable ? "Save Changes" : "No Changes";
     };
 
-    UI.prototype.showPhotoSession = function (url) {
-      var uiEl = document.getElementById('photos-session-ui');
-      var link = document.getElementById('photos-session-link');
-      var status = document.getElementById('photos-session-status');
+              UI.prototype.showTransferSession = function (mode, serviceName) {
+                var el = document.getElementById('transfer-session-ui');
+                var desc = document.getElementById('transfer-desc');
+                var statusText = document.getElementById('transfer-status-text');
+                var bar = document.getElementById('transfer-progress-bar');
+                var btnReopen = document.getElementById('btn-transfer-reopen');
+                var btnCancel = document.getElementById('btn-transfer-cancel');
 
-      uiEl.style.display = 'block';
-      link.href = url;
-      // We also open it automatically in a popup
-      const width = 1200;
-      const height = 800;
-      const left = (screen.width - width) / 2;
-      const top = (screen.height - height) / 2;
+              el.style.display = 'block';
+              bar.style.width = '0%';
+              statusText.innerText = 'Initializing...';
+              document.getElementById('transfer-count').innerText = '';
 
-      // Attempt popup
-      const popup = window.open(url, 'googlePhotos', `width=${width},height=${height},top=${top},left=${left}`);
+              // Reset Buttons
+              btnCancel.disabled = false;
+              btnReopen.disabled = true; // Default
 
-      if (popup) {
-        link.innerText = "Re-open Popup ↗";
-        link.onclick = function (e) {
-          e.preventDefault();
-          window.open(url, 'googlePhotos', `width=${width},height=${height},top=${top},left=${left}`);
+              if (mode === 'waiting') {
+                desc.innerText = "Select items from " + (serviceName || "the service") + " in the popup window. Click 'Done' when finished.";
+                statusText.innerText = "Waiting for selection...";
+              } else {
+                desc.innerText = "Importing media from " + (serviceName || "source") + "...";
         }
+              };
+
+              UI.prototype.updateTransferProgress = function (current, total, statusMsg) {
+                var bar = document.getElementById('transfer-progress-bar');
+                var statusText = document.getElementById('transfer-status-text');
+                var countText = document.getElementById('transfer-count');
+
+                // Disable Reopen once transfer starts
+                const btnReopen = document.getElementById('btn-transfer-reopen');
+                if (btnReopen) btnReopen.disabled = true;
+
+                if (total > 0) {
+                  var pct = Math.round((current / total) * 100);
+                  bar.style.width = pct + '%';
+                  countText.innerText = current + ' / ' + total;
       } else {
-        link.innerText = "Open Google Photos ↗";
-        link.onclick = null; // Default href behavior
+                // Indeterminate
+                bar.style.width = '100%';
+                countText.innerText = '';
       }
 
-      status.innerText = "Waiting for selection in popup...";
+              if (statusMsg) statusText.innerText = statusMsg;
+
+              // If done, disable cancel
+              if (current === total && total > 0) {
+                const btnCancel = document.getElementById('btn-transfer-cancel');
+                if (btnCancel) btnCancel.disabled = true;
+              }
     };
 
-    UI.prototype.closePhotoSession = function () {
-      document.getElementById('photos-session-ui').style.display = 'none';
+            UI.prototype.hideTransferSession = function () {
+              document.getElementById('transfer-session-ui').style.display = 'none';
     };
 
-    UI.prototype.updatePhotoStatus = function (msg) {
-      document.getElementById('photos-session-status').innerText = msg;
+          UI.prototype.setupReopenButton = function (url) {
+            var btn = document.getElementById('btn-transfer-reopen');
+            if (!url) {
+              btn.disabled = true;
+              return;
+            }
+
+            const width = 1200;
+            const height = 800;
+            const left = (screen.width - width) / 2;
+            const top = (screen.height - height) / 2;
+            const params = `width=${width},height=${height},top=${top},left=${left}`;
+
+            btn.onclick = function (e) {
+              e.preventDefault();
+              window.open(url, 'googlePhotos', params);
+            };
+            btn.disabled = false;
     };
 
     UI.prototype.render = function (items) {
@@ -1268,11 +1352,6 @@
         // Start Polling
         this.startLogPolling(jobId);
 
-        // Expand Log Card
-        if (!ui.logCard.classList.contains('expanded')) {
-          ui.toggleLogExpand();
-        }
-
         // Filter out deleted items
         const activeItems = state.items.filter(i => !i._deleted);
 
@@ -1336,21 +1415,42 @@
 
       handleFiles(fileList) {
         if (!fileList || fileList.length === 0) return;
+
         this.setPickerState(true);
-        Array.from(fileList).forEach(file => {
+        this.initTransferState();
+        ui.showTransferSession('transferring', 'Your Computer');
+
+        const total = fileList.length;
+        let done = 0;
+
+        Array.from(fileList).forEach((file, i) => {
+          if (this.transferState.shouldCancel) return;
+
           const reader = new FileReader();
           reader.onload = (e) => {
+            if (this.transferState.shouldCancel) return;
+
             const data = e.target.result.split(',')[1]; // Base64
 
+            ui.updateTransferProgress(done, total, `Uploading ${file.name}...`);
+
             google.script.run
               .withSuccessHandler(() => {
-                this.loadMedia();
-                this.setPickerState(false);
+                if (this.transferState.shouldCancel) return;
+                done++;
+                ui.updateTransferProgress(done, total);
+
+                if (done === total) {
+                  ui.updateTransferProgress(total, total, "Done!");
+                  this.finishTransfer();
+                }
               })
               .withFailureHandler(err => {
                 console.error(err);
-                alert("Upload failed: " + err.message);
-                this.setPickerState(false);
+                // Allow continuing even if one fails
+                done++;
+                ui.updateTransferProgress(done, total, "Error on " + file.name);
+                if (done === total) this.finishTransfer();
               })
               .saveFileToDrive(state.sku, file.name, file.type, data);
           };
@@ -1375,6 +1475,8 @@
       openPicker() {
         if (!pickerApiLoaded) return alert("API Loading...");
         this.setPickerState(true);
+        // We don't show the full session UI for Drive picker config loading,
+        // just disable buttons. The picker is its own UI.
         google.script.run
           .withSuccessHandler(c => createPicker(c))
           .withFailureHandler(e => {
@@ -1385,53 +1487,119 @@
       },
 
       importFromPicker(fileId, mime, name, url) {
+        // Drive Picker Result
+        this.initTransferState();
+        ui.showTransferSession('transferring', 'Google Drive');
+
+        // Single Item, so 0/1 -> 1/1
+        ui.updateTransferProgress(0, 1, "Importing " + name + "...");
+
         google.script.run
           .withSuccessHandler(() => {
-            this.loadMedia();
-            this.setPickerState(false);
+            if (this.transferState.shouldCancel) return;
+            ui.updateTransferProgress(1, 1, "Done!");
+            this.finishTransfer();
           })
           .withFailureHandler(e => {
             alert("Import failed: " + e.message);
-            this.setPickerState(false);
+            this.finishTransfer(); // Cleanup
           })
           .importFromPicker(state.sku, fileId, mime, name, url);
       },
 
+      // --- Transfer State & Logic ---
+      transferState: {
+        isTransferring: false,
+        shouldCancel: false,
+        pollingId: null
+      },
+
+      initTransferState() {
+        this.transferState = { isTransferring: true, shouldCancel: false, pollingId: null };
+      },
+
+      cancelTransfer() {
+        this.transferState.shouldCancel = true;
+        this.transferState.isTransferring = false;
+
+        if (this.transferState.pollingId) {
+          clearTimeout(this.transferState.pollingId); // Note: using setTimeout in pollPhotoSession
+          this.transferState.pollingId = null;
+        }
+
+        ui.hideTransferSession();
+        this.setPickerState(false);
+        ui.logStatus('info', 'Transfer cancelled by user.', 'info');
+      },
+
+      finishTransfer() {
+        if (this.transferState.shouldCancel) return; // Already cleaned up
+        this.transferState.isTransferring = false;
+
+        this.loadMedia();
+        this.setPickerState(false);
+        setTimeout(() => ui.hideTransferSession(), 2000);
+      },
+      
+
       startPhotoSession() {
         this.setPickerState(true);
-        ui.updatePhotoStatus("Starting session...");
+        this.initTransferState();
+        ui.showTransferSession('waiting', 'Google Photos');
+
         google.script.run
           .withSuccessHandler(session => {
-            ui.showPhotoSession(session.pickerUri);
+            if (this.transferState.shouldCancel) return; // Cancelled during init
+
+            // Setup popup logic
+            const width = 1200, height = 800;
+            const left = (screen.width - width) / 2;
+            const top = (screen.height - height) / 2;
+            const params = `width=${width},height=${height},top=${top},left=${left}`;
+
+            // Auto open
+            window.open(session.pickerUri, 'googlePhotos', params);
+
+            // Setup reopen link
+            ui.setupReopenButton(session.pickerUri);
+
             this.pollPhotoSession(session.id);
           })
           .withFailureHandler(e => {
-            ui.updatePhotoStatus("Failed: " + e.message);
+            alert("Failed to start session: " + e.message);
             this.setPickerState(false);
+            ui.hideTransferSession();
           })
           .createPhotoSession();
       },
 
       pollPhotoSession(sessionId) {
-        let processing = false;
+        if (this.transferState.shouldCancel) return;
+
         const check = () => {
-          if (processing) return;
+          if (this.transferState.shouldCancel) return;
+
           google.script.run
             .withSuccessHandler(res => {
+              if (this.transferState.shouldCancel) return;
+
               if (res.status === 'complete') {
-                processing = true;
-                ui.updatePhotoStatus("Importing photos...");
+                // Transition to transferring
+                ui.updateTransferProgress(0, 0, "Importing photos...");
                 this.processPhotoItems(res.mediaItems);
               } else if (res.status === 'error') {
-                ui.updatePhotoStatus("Error: " + res.message);
-                this.setPickerState(false);
+                alert("Photo Picker Error: " + res.message);
+                this.cancelTransfer();
               } else {
-                setTimeout(check, 2000);
+                // Keep polling
+                this.transferState.pollingId = setTimeout(check, 2000);
               }
             })
             .withFailureHandler(e => {
-              ui.updatePhotoStatus("Error polling: " + e.message);
-              this.setPickerState(false);
+              console.error(e);
+              // Retry? Or fail. Let's fail after error.
+              alert("Polling Error: " + e.message);
+              this.cancelTransfer();
             })
             .checkPhotoSession(sessionId);
         };
@@ -1440,41 +1608,37 @@
 
       processPhotoItems(items) {
         let done = 0;
+        const total = items.length;
+
+        ui.updateTransferProgress(0, total, `Found ${total} items. Starting import...`);
+
+        // Process sequentially or parallel? Parallel is fine for GAS calls usually,
+        // but let's count them accurately.
+
         items.forEach(item => {
-          console.log("[MediaManager] Processing Item:", JSON.stringify(item));
+          if (this.transferState.shouldCancel) return;
 
-          // The API returns nested 'mediaFile' object for actual file details
           const mediaFile = item.mediaFile || item;
-
           const url = mediaFile.baseUrl || item.baseUrl;
           const filename = mediaFile.filename || item.filename;
           let mimeType = mediaFile.mimeType || item.mimeType;
 
-          console.log(`[MediaManager] Extracted: URL=${url ? 'Yes' : 'No'}, Mime=${mimeType}, Name=${filename}`);
-
-          // Force video mimeType if metadata indicates video (Critical for backend =dv param)
           if (item.mediaMetadata && item.mediaMetadata.video) {
-            console.log("[MediaManager] Metadata indicates VIDEO. Forcing video/mp4.");
             mimeType = 'video/mp4';
           }
 
           google.script.run
             .withSuccessHandler(() => {
+              if (this.transferState.shouldCancel) return;
               done++;
-              if (done === items.length) {
-                ui.updatePhotoStatus("Done!");
-                controller.loadMedia();
-                this.setPickerState(false);
-                setTimeout(() => ui.closePhotoSession(), 2000);
-              }
+              ui.updateTransferProgress(done, total);
+              if (done === total) this.finishTransfer();
             })
             .withFailureHandler(e => {
-              console.error("Import failed", e);
-              // If last one
+              console.error(e);
               done++;
-              if (done === items.length) {
-                this.setPickerState(false);
-              }
+              ui.updateTransferProgress(done, total, "Error importing item");
+              if (done === total) this.finishTransfer();
             })
             .importFromPicker(state.sku, null, mimeType, filename, url);
         });