Global/local chat history store in localstorage (#2428)

ui/desktop/src/utils/localMessageStorage.ts

@@ -0,0 +1,76 @@
+interface StoredMessage {
+  content: string;
+  timestamp: number;
+}
+
+const STORAGE_KEY = 'goose-chat-history';
+const MAX_MESSAGES = 500;
+const EXPIRY_DAYS = 30;
+
+export class LocalMessageStorage {
+  private static getStoredMessages(): StoredMessage[] {
+    try {
+      const stored = localStorage.getItem(STORAGE_KEY);
+      if (!stored) return [];
+
+      const messages = JSON.parse(stored) as StoredMessage[];
+      const now = Date.now();
+      const expiryTime = now - EXPIRY_DAYS * 24 * 60 * 60 * 1000;
+
+      // Filter out expired messages and limit to max count
+      const validMessages = messages
+        .filter((msg) => msg.timestamp > expiryTime)
+        .slice(-MAX_MESSAGES);
+
+      // If we filtered any messages, update storage
+      if (validMessages.length !== messages.length) {
+        this.setStoredMessages(validMessages);
+      }
+
+      return validMessages;
+    } catch (error) {
+      console.error('Error reading message history:', error);
+      return [];
+    }
+  }
+
+  private static setStoredMessages(messages: StoredMessage[]) {
+    try {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(messages));
+    } catch (error) {
+      console.error('Error saving message history:', error);
+    }
+  }
+
+  static addMessage(content: string) {
+    if (!content.trim()) return;
+
+    const messages = this.getStoredMessages();
+    const now = Date.now();
+
+    // Don't add duplicate of last message
+    if (messages.length > 0 && messages[messages.length - 1].content === content) {
+      return;
+    }
+
+    messages.push({
+      content,
+      timestamp: now,
+    });
+
+    // Keep only the most recent MAX_MESSAGES
+    const validMessages = messages.slice(-MAX_MESSAGES);
+
+    this.setStoredMessages(validMessages);
+  }
+
+  static getRecentMessages(): string[] {
+    return this.getStoredMessages()
+      .map((msg) => msg.content)
+      .reverse(); // Most recent first
+  }
+
+  static clearHistory() {
+    localStorage.removeItem(STORAGE_KEY);
+  }
+}