2 files changed, 114 insertions, 5 deletions

diff --git a/ui/src/App.svelte b/ui/src/App.svelte
index 18ef5e5..0e14cb0 100644
--- a/ui/src/App.svelte
+++ b/ui/src/App.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
   import { invoke } from "@tauri-apps/api/core";
   import { onMount } from "svelte";
+  import DownloadMonitor from "./lib/DownloadMonitor.svelte";
 
   let status = "Ready";
 
@@ -48,8 +49,12 @@
   async function login() {
       if (currentAccount) {
          if (confirm("Logout " + currentAccount.username + "?")) {
-             currentAccount = null;
-             // Note: Backend state persists until restarted or overwritten.
+             try {
+                await invoke("logout");
+                currentAccount = null;
+             } catch(e) {
+                console.error("Logout failed:", e);
+             }
          }
          return;
       }
@@ -64,10 +69,21 @@
   }
 
   async function startGame() {
-    status = "Launching (Simulated)...";
-    console.log("Invoking start_game...");
+    if (!currentAccount) {
+        alert("Please login first!");
+        login();
+        return;
+    }
+
+    if (!selectedVersion) {
+        alert("Please select a version!");
+        return;
+    }
+
+    status = "Preparing to launch " + selectedVersion + "...";
+    console.log("Invoking start_game for version:", selectedVersion);
     try {
-        const msg = await invoke("start_game");
+        const msg = await invoke("start_game", { versionId: selectedVersion });
         console.log("Response:", msg);
         status = msg as string;
     } catch (e) {
@@ -110,6 +126,7 @@
 
   <!-- Main Content -->
   <main class="flex-1 flex flex-col relative min-w-0">
+    <DownloadMonitor />
     <!-- Top Bar (Window Controls Placeholder) -->
     <div class="h-8 w-full bg-zinc-900/50 absolute top-0 left-0 z-50 drag-region" data-tauri-drag-region>
         <!-- Windows/macOS controls would go here or be handled by OS -->
diff --git a/ui/src/lib/DownloadMonitor.svelte b/ui/src/lib/DownloadMonitor.svelte
new file mode 100644
index 0000000..b2751fe
--- /dev/null
+++ b/ui/src/lib/DownloadMonitor.svelte
@@ -0,0 +1,92 @@
+<script lang="ts">
+  import { listen } from "@tauri-apps/api/event";
+  import { onMount, onDestroy } from "svelte";
+
+  export let visible = false;
+
+  interface DownloadEvent {
+    file: string;
+    downloaded: number; // in bytes
+    total: number; // in bytes
+    status: string;
+  }
+
+  let currentFile = "";
+  let progress = 0; // percentage 0-100
+  let totalFiles = 0;
+  let statusText = "Preparing...";
+  let unlistenProgress: () => void;
+  let unlistenStart: () => void;
+  let unlistenComplete: () => void;
+  let downloadedBytes = 0;
+  let totalBytes = 0;
+
+  onMount(async () => {
+    unlistenStart = await listen<number>("download-start", (event) => {
+        visible = true;
+        totalFiles = event.payload;
+        progress = 0;
+        statusText = "Starting download...";
+        currentFile = "";
+    });
+
+    unlistenProgress = await listen<DownloadEvent>("download-progress", (event) => {
+        const payload = event.payload;
+        currentFile = payload.file;
+        
+        // Simple file progress for now. Global progress would require tracking all files.
+        // For single file (Client jar), this is accurate.
+        downloadedBytes = payload.downloaded;
+        totalBytes = payload.total;
+        
+        statusText = payload.status;
+        
+        if (payload.total > 0) {
+            progress = (payload.downloaded / payload.total) * 100;
+        }
+    });
+
+    unlistenComplete = await listen("download-complete", () => {
+        statusText = "Done!";
+        progress = 100;
+        setTimeout(() => { visible = false; }, 2000);
+    });
+  });
+
+  onDestroy(() => {
+    if (unlistenProgress) unlistenProgress();
+    if (unlistenStart) unlistenStart();
+    if (unlistenComplete) unlistenComplete();
+  });
+  
+  function formatBytes(bytes: number) {
+      if (bytes === 0) return '0 B';
+      const k = 1024;
+      const sizes = ['B', 'KB', 'MB', 'GB'];
+      const i = Math.floor(Math.log(bytes) / Math.log(k));
+      return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+  }
+</script>
+
+{#if visible}
+<div class="fixed bottom-28 right-8 z-50 w-80 bg-zinc-900/90 backdrop-blur-md border border-zinc-700 rounded-lg shadow-2xl p-4 animate-in slide-in-from-right-10 fade-in duration-300">
+    <div class="flex items-center justify-between mb-2">
+        <h3 class="text-white font-bold text-sm">Downloads</h3>
+        <span class="text-xs text-zinc-400">{statusText}</span>
+    </div>
+    
+    <div class="text-xs text-zinc-300 truncate mb-1" title={currentFile}>
+        {currentFile || "Waiting..."}
+    </div>
+
+    <!-- Progress Bar -->
+    <div class="w-full bg-zinc-800 rounded-full h-2 mb-2 overflow-hidden">
+        <div class="bg-gradient-to-r from-green-500 to-emerald-400 h-2 rounded-full transition-all duration-200" style="width: {progress}%"></div>
+    </div>
+
+    <div class="flex justify-between text-[10px] text-zinc-500 font-mono">
+        <span>{formatBytes(downloadedBytes)} / {formatBytes(totalBytes)}</span>
+        <span>{Math.round(progress)}%</span>
+    </div>
+</div>
+{/if}