feat: add offline account management and version fetching functionality

1 files changed, 51 insertions, 0 deletions

diff --git a/src-tauri/src/core/downloader.rs b/src-tauri/src/core/downloader.rs
new file mode 100644
index 0000000..8d717be
--- /dev/null
+++ b/src-tauri/src/core/downloader.rs
@@ -0,0 +1,51 @@
+use std::path::PathBuf;
+use tokio::sync::mpsc;
+use serde::{Serialize, Deserialize};
+
+#[derive(Debug, Clone)]
+pub struct DownloadTask {
+    pub url: String,
+    pub path: PathBuf,
+    pub sha1: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum DownloadProgress {
+    Started(String),
+    Progress { file: String, downloaded: u64, total: u64 },
+    Finished(String),
+    Error(String, String),
+}
+
+pub struct Downloader {
+    sender: mpsc::Sender<DownloadProgress>,
+}
+
+impl Downloader {
+    pub fn new(sender: mpsc::Sender<DownloadProgress>) -> Self {
+        Self { sender }
+    }
+
+    pub async fn download(&self, tasks: Vec<DownloadTask>) {
+        // TODO: Implement parallel download with limits
+        // Use futures::stream::StreamExt::buffer_unordered
+        
+        for task in tasks {
+            if let Err(_) = self.sender.send(DownloadProgress::Started(task.url.clone())).await {
+                break;
+            }
+
+            // Simulate download for now or implement basic
+            // Ensure directory exists
+            if let Some(parent) = task.path.parent() {
+                 let _ = tokio::fs::create_dir_all(parent).await;
+            }
+
+            // Real implementation would use reqwest here
+            
+            if let Err(_) = self.sender.send(DownloadProgress::Finished(task.url)).await {
+                break;
+            }
+        }
+    }
+}