add chat message overlay

src/components/chat/ChatOverlay.tsx

@@ -0,0 +1,214 @@
+"use client";
+
+import { TranscriptionTile } from "@/transcriptions/TranscriptionTile";
+import { TrackReferenceOrPlaceholder } from "@livekit/components-react";
+import { useCallback, useEffect, useRef, useState } from "react";
+
+export interface ChatOverlayProps {
+  agentAudioTrack?: TrackReferenceOrPlaceholder;
+  accentColor: string;
+  inputDisabled?: boolean;
+  isVisible: boolean;
+  position: { x: number; y: number };
+  onPositionChange: (position: { x: number; y: number }) => void;
+  containerRef: React.RefObject<HTMLDivElement>;
+  onToggle: () => void;
+}
+
+export function ChatOverlay({
+  agentAudioTrack,
+  accentColor,
+  inputDisabled,
+  isVisible,
+  position,
+  onPositionChange,
+  containerRef,
+  onToggle,
+}: ChatOverlayProps) {
+  const overlayRef = useRef<HTMLDivElement>(null);
+  const headerRef = useRef<HTMLDivElement>(null);
+  const [isDragging, setIsDragging] = useState(false);
+  const dragOffset = useRef({ x: 0, y: 0 });
+
+  // Responsive sizing based on container size
+  const [containerSize, setContainerSize] = useState({ width: 360, height: 500 });
+
+  useEffect(() => {
+    const updateSize = () => {
+      if (containerRef.current) {
+        const rect = containerRef.current.getBoundingClientRect();
+        setContainerSize({ width: rect.width, height: rect.height });
+      }
+    };
+
+    updateSize();
+    const resizeObserver = new ResizeObserver(updateSize);
+    if (containerRef.current) {
+      resizeObserver.observe(containerRef.current);
+    }
+
+    return () => {
+      resizeObserver.disconnect();
+    };
+  }, [containerRef]);
+
+  // Calculate overlay size as percentage of container, with min/max constraints
+  // Width: larger (up to 95% of container)
+  const overlayWidth = Math.min(
+    Math.max(containerSize.width * 0.9, 280),
+    containerSize.width * 0.95
+  );
+  // Height: smaller (reduced from 60-85% to 40-60%)
+  const overlayHeight = Math.min(
+    Math.max(containerSize.height * 0.4, 250),
+    containerSize.height * 0.6
+  );
+
+  // Position overlay at center when first shown
+  const hasPositionedRef = useRef(false);
+  useEffect(() => {
+    if (isVisible && containerRef.current && containerSize.width > 0 && overlayWidth > 0 && overlayHeight > 0) {
+      // Calculate center position
+      const centerX = (containerSize.width - overlayWidth) / 2;
+      const centerY = (containerSize.height - overlayHeight) / 2;
+      
+      // Only auto-position on first show (when position is at origin)
+      if (!hasPositionedRef.current && position.x === 0 && position.y === 0) {
+        onPositionChange({ x: Math.max(0, centerX), y: Math.max(0, centerY) });
+        hasPositionedRef.current = true;
+      }
+    }
+  }, [isVisible, containerSize.width, containerSize.height, overlayWidth, overlayHeight, containerRef, position, onPositionChange]);
+
+  const handleDragStart = (e: React.MouseEvent | React.TouchEvent) => {
+    if (!overlayRef.current || !headerRef.current) return;
+    
+    // Only allow dragging from the header, but not from buttons
+    const target = e.target as HTMLElement;
+    if (!headerRef.current.contains(target)) return;
+    
+    // Don't drag if clicking on the close button
+    if (target.closest('button') || target.closest('svg')) return;
+
+    e.preventDefault();
+    e.stopPropagation();
+    setIsDragging(true);
+    
+    const clientX = 'touches' in e ? e.touches[0].clientX : e.clientX;
+    const clientY = 'touches' in e ? e.touches[0].clientY : e.clientY;
+    
+    dragOffset.current = {
+      x: clientX - position.x,
+      y: clientY - position.y,
+    };
+  };
+
+  const handleDragMove = useCallback((e: MouseEvent | TouchEvent) => {
+    if (!isDragging || !containerRef.current || !overlayRef.current) return;
+
+    e.preventDefault();
+    e.stopPropagation();
+
+    const containerRect = containerRef.current.getBoundingClientRect();
+    const overlayRect = overlayRef.current.getBoundingClientRect();
+
+    const clientX = 'touches' in e ? e.touches[0].clientX : e.clientX;
+    const clientY = 'touches' in e ? e.touches[0].clientY : e.clientY;
+
+    let newX = clientX - dragOffset.current.x;
+    let newY = clientY - dragOffset.current.y;
+
+    // Constrain within container bounds
+    const maxX = containerRect.width - overlayRect.width;
+    const maxY = containerRect.height - overlayRect.height;
+    const minY = 0; // Allow dragging to top
+
+    newX = Math.max(0, Math.min(newX, maxX));
+    newY = Math.max(minY, Math.min(newY, maxY));
+
+    onPositionChange({ x: newX, y: newY });
+  }, [isDragging, containerRef, overlayRef, onPositionChange]);
+
+  const handleDragEnd = useCallback(() => {
+    setIsDragging(false);
+  }, []);
+
+  useEffect(() => {
+    if (isDragging) {
+      window.addEventListener("mousemove", handleDragMove);
+      window.addEventListener("mouseup", handleDragEnd);
+      window.addEventListener("touchmove", handleDragMove, { passive: false });
+      window.addEventListener("touchend", handleDragEnd);
+    }
+    return () => {
+      window.removeEventListener("mousemove", handleDragMove);
+      window.removeEventListener("mouseup", handleDragEnd);
+      window.removeEventListener("touchmove", handleDragMove);
+      window.removeEventListener("touchend", handleDragEnd);
+    };
+  }, [isDragging, handleDragMove, handleDragEnd]);
+
+  return (
+    <div
+      ref={overlayRef}
+      className="absolute z-40 rounded-lg border border-white/20 shadow-2xl backdrop-blur-md transition-all duration-300 flex flex-col"
+      style={{
+        left: `${position.x}px`,
+        top: `${position.y}px`,
+        width: `${overlayWidth}px`,
+        height: `${overlayHeight}px`,
+        backgroundColor: 'rgba(0, 0, 0, 0.85)',
+        cursor: isDragging ? 'grabbing' : 'default',
+        display: isVisible ? 'flex' : 'none',
+      }}
+      onMouseDown={handleDragStart}
+      onTouchStart={handleDragStart}
+    >
+      {/* Header with drag handle and close button */}
+      <div
+        ref={headerRef}
+        className="flex items-center justify-between px-4 py-2 border-b border-white/10 cursor-move select-none"
+        style={{ backgroundColor: 'rgba(0, 0, 0, 0.3)' }}
+      >
+        <div className="flex items-center gap-2">
+          <div className="w-2 h-2 rounded-full bg-white/40"></div>
+          <span className="text-white text-xs font-medium">Chat</span>
+        </div>
+        <button
+          onClick={(e) => {
+            e.stopPropagation();
+            e.preventDefault();
+            onToggle();
+          }}
+          className="text-white hover:text-white transition-colors p-2 rounded hover:bg-white/10 flex items-center justify-center"
+          aria-label="Close chat overlay"
+          style={{ minWidth: '32px', minHeight: '32px' }}
+        >
+          <svg
+            className="w-5 h-5"
+            fill="none"
+            stroke="currentColor"
+            viewBox="0 0 24 24"
+            strokeWidth={2.5}
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              d="M6 18L18 6M6 6l12 12"
+            />
+          </svg>
+        </button>
+      </div>
+
+      {/* Chat content with padding */}
+      <div className="overflow-hidden flex flex-col px-2 py-2" style={{ height: `calc(100% - 40px)` }}>
+        <TranscriptionTile
+          agentAudioTrack={agentAudioTrack}
+          accentColor={accentColor}
+          inputDisabled={inputDisabled}
+        />
+      </div>
+    </div>
+  );
+}
+

src/components/playground/PhoneSimulator.tsx

@@ -13,8 +13,9 @@ import {
 } from "@livekit/components-react";
 import { ConnectionState, Track, LocalParticipant, Room } from "livekit-client";
 import { useEffect, useMemo, useState, useRef, useCallback } from "react";
-import { BatteryIcon, ImageIcon, MicIcon, MicOffIcon, PhoneIcon, PhoneOffIcon, WifiIcon, SwitchCameraIcon, VoiceIcon, CheckIcon } from "./icons";
+import { BatteryIcon, ImageIcon, MicIcon, MicOffIcon, PhoneIcon, PhoneOffIcon, WifiIcon, SwitchCameraIcon, VoiceIcon, CheckIcon, ChatIcon } from "./icons";
 import { useToast } from "@/components/toast/ToasterProvider";
+import { ChatOverlay } from "@/components/chat/ChatOverlay";
 
 export interface PhoneSimulatorProps {
     onConnect: () => void;
@@ -67,6 +68,8 @@ export function PhoneSimulator({
   const [interruptRejected, setInterruptRejected] = useState(false);
   const [isPushToTalkMode, setIsPushToTalkMode] = useState(true); // false = realtime mode, true = PTT mode (default)
   const pushToTalkButtonRef = useRef<HTMLButtonElement>(null);
+  const [showChatOverlay, setShowChatOverlay] = useState(false);
+  const [chatOverlayPosition, setChatOverlayPosition] = useState({ x: 0, y: 0 }); // Will be positioned at top-right by ChatOverlay component
 
   useEffect(() => {
     const voiceAttr = config.settings.attributes?.find(a => a.key === "voice");
@@ -852,6 +855,28 @@ export function PhoneSimulator({
         </div>
       </div>
 
+      {/* Chat Toggle Button - Top Right, aligned with audio visualizer */}
+      {roomState === ConnectionState.Connected && 
+       voiceAssistant.agent && 
+       phoneMode !== "important_message" && 
+       phoneMode !== "capture" && (
+        <button
+          className={`absolute right-2 z-50 p-3 rounded-full backdrop-blur-md transition-colors shadow-lg ${
+            showChatOverlay
+              ? "bg-blue-500/80 text-white"
+              : "bg-gray-800/70 text-white hover:bg-gray-800/90"
+          }`}
+          onClick={() => setShowChatOverlay(!showChatOverlay)}
+          title={showChatOverlay ? "Hide chat" : "Show chat"}
+          style={{
+            top: '56px', // Align with audio visualizer initial position
+            right: '8px',
+          }}
+        >
+          <ChatIcon className="w-5 h-5 md:w-6 md:h-6" />
+        </button>
+      )}
+
       {/* Main Content */}
       <div ref={phoneContainerRef} className="flex-grow relative bg-gray-950 w-full h-full overflow-hidden"
            style={{
@@ -1002,6 +1027,23 @@ export function PhoneSimulator({
           </div>
         )}
 
+      {/* Chat Overlay - Hidden during capture and important_message modes */}
+      {roomState === ConnectionState.Connected && 
+       voiceAssistant.agent && 
+       phoneMode !== "capture" && 
+       phoneMode !== "important_message" && (
+        <ChatOverlay
+          agentAudioTrack={voiceAssistant.audioTrack}
+          accentColor={config.settings.theme_color}
+          inputDisabled={phoneMode === "important_message" || phoneMode === "hand_off"}
+          isVisible={showChatOverlay}
+          position={chatOverlayPosition}
+          onPositionChange={setChatOverlayPosition}
+          containerRef={phoneContainerRef}
+          onToggle={() => setShowChatOverlay(!showChatOverlay)}
+        />
+      )}
+
       {/* Call Controls Overlay */}
       {roomState === ConnectionState.Connected && (
           phoneMode === "capture" ? (
@@ -1120,9 +1162,20 @@ export function PhoneSimulator({
 
               {/* Push-to-Talk Mode Layout */}
               {isPushToTalkMode && phoneMode !== "hand_off" && voiceAssistant.agent && (
-                <div className="w-full flex items-center justify-center gap-8">
+                <>
-                  {/* Mic Toggle and Camera Switch Buttons - Left (hidden in important_message mode) */}
+                  {/* Important Message Mode - Centered End Call Button */}
-                  {phoneMode !== "important_message" && (
+                  {phoneMode === "important_message" ? (
+                    <div className="w-full flex items-center justify-center">
+                      <button
+                        className="p-4 rounded-full bg-red-500 text-white hover:bg-red-600 transition-colors"
+                        onClick={handleDisconnect}
+                      >
+                        <PhoneOffIcon className="w-6 h-6" />
+                      </button>
+                    </div>
+                  ) : (
+                    <div className="w-full flex items-center justify-between gap-8">
+                      {/* Left side: Mic Toggle and Camera Switch Buttons */}
                       <div className="flex flex-col items-center gap-2">
                         {/* Mic Toggle Button */}
                         <button
@@ -1169,10 +1222,8 @@ export function PhoneSimulator({
                           )}
                         </div>
                       </div>
-                  )}
 
-                  {/* Large Push-to-Talk Button - Center (hidden in important_message mode) */}
+                      {/* Center: Large Push-to-Talk Button */}
-                  {phoneMode !== "important_message" && (
                       <button
                         ref={pushToTalkButtonRef}
                         className={`w-24 h-24 rounded-full backdrop-blur-md transition-all flex flex-col items-center justify-center gap-2 aspect-square select-none ${
@@ -1194,9 +1245,8 @@ export function PhoneSimulator({
                           {interruptRejected ? "不允许打断" : "按住说话"}
                         </span>
                       </button>
-                  )}
 
-                  {/* End Call Button - Right (always shown in PTT mode) */}
+                      {/* Right side: End Call Button */}
                       <button
                         className="p-4 rounded-full bg-red-500 text-white hover:bg-red-600 transition-colors"
                         onClick={handleDisconnect}
@@ -1205,11 +1255,26 @@ export function PhoneSimulator({
                       </button>
                     </div>
                   )}
+                </>
+              )}
 
               {/* Realtime Mode Layout */}
               {!isPushToTalkMode && (
-                <div className="w-full flex items-center justify-center gap-8">
+                <>
-                  {phoneMode !== "important_message" && phoneMode !== "hand_off" && (
+                  {/* Important Message Mode - Centered End Call Button */}
+                  {phoneMode === "important_message" ? (
+                    <div className="w-full flex items-center justify-center">
+                      <button
+                        className="p-4 rounded-full bg-red-500 text-white hover:bg-red-600 transition-colors"
+                        onClick={handleDisconnect}
+                      >
+                        <PhoneOffIcon className="w-6 h-6" />
+                      </button>
+                    </div>
+                  ) : (
+                    <div className="w-full flex items-center justify-between gap-8">
+                      {/* Left side: Mic Toggle */}
+                      {phoneMode !== "hand_off" && (
                         <button
                           className={`p-4 rounded-full backdrop-blur-md transition-colors ${
                             !isMicEnabled
@@ -1226,7 +1291,7 @@ export function PhoneSimulator({
                         </button>
                       )}
 
-                  {/* End Call Button */}
+                      {/* Right side: End Call Button */}
                       <button
                         className="p-4 rounded-full bg-red-500 text-white hover:bg-red-600 transition-colors"
                         onClick={handleDisconnect}
@@ -1235,6 +1300,8 @@ export function PhoneSimulator({
                       </button>
                     </div>
                   )}
+                </>
+              )}
 
               {/* Hand Off Mode - Show only End Call Button */}
               {phoneMode === "hand_off" && (

src/components/playground/icons.tsx

@@ -207,3 +207,20 @@ export const VoiceIcon = ({ className }: { className?: string }) => (
     <line x1="12" y1="19" x2="12" y2="22" />
   </svg>
 );
+
+export const ChatIcon = ({ className }: { className?: string }) => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="24"
+    height="24"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+    className={className}
+  >
+    <path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"></path>
+  </svg>
+);