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fusion/packages/dashboard/app/components/ChatView.tsx

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// ChatView.css is imported eagerly from App.tsx to avoid a flash of
// unstyled content when the lazy chunk loads. Do not re-import here.
import { memo, useCallback, useEffect, useMemo, useRef, useState, type CSSProperties, type ReactNode } from "react";
import ReactMarkdown from "react-markdown";
import remarkGfm from "remark-gfm";
import type { Components } from "react-markdown";
import {
MessageSquare,
Send,
Plus,
Search,
Trash2,
Archive,
ChevronLeft,
Bot,
Square,
Eye,
EyeOff,
Paperclip,
File,
Wrench,
} from "lucide-react";
import { useChat, type ChatMessageInfo, type ToolCallInfo } from "../hooks/useChat";
import { useViewportMode } from "./Header";
import { fetchAgents, fetchDiscoveredSkills, fetchModels, updateGlobalSettings } from "../api";
import type { Agent } from "@fusion/core";
import type { DiscoveredSkill } from "@fusion/dashboard";
import type { ModelInfo } from "../api";
import { CustomModelDropdown } from "./CustomModelDropdown";
import { AgentMentionPopup } from "./AgentMentionPopup";
import { FileMentionPopup } from "./FileMentionPopup";
import { useFileMention } from "../hooks/useFileMention";
import { useMobileKeyboard } from "../hooks/useMobileKeyboard";
import { useMobileScrollLock } from "../hooks/useMobileScrollLock";
export interface ChatViewProps {
projectId?: string;
addToast: (msg: string, type?: "success" | "error" | "warning") => void;
}
function formatRelativeTime(dateStr: string): string {
const date = new Date(dateStr);
const now = new Date();
const diffMs = now.getTime() - date.getTime();
const diffSecs = Math.floor(diffMs / 1000);
const diffMins = Math.floor(diffSecs / 60);
const diffHours = Math.floor(diffMins / 60);
const diffDays = Math.floor(diffHours / 24);
if (diffSecs < 60) return "just now";
if (diffMins < 60) return `${diffMins}m ago`;
if (diffHours < 24) return `${diffHours}h ago`;
if (diffDays < 7) return `${diffDays}d ago`;
return date.toLocaleDateString();
}
/**
* Format a model provider and ID into a human-readable tag.
* Returns null if provider or modelId is missing/empty.
*/
function formatModelTag(provider?: string | null, modelId?: string | null): string | null {
if (!provider || !modelId) return null;
// Handle known provider/model patterns
const normalizedModel = modelId.toLowerCase();
// Claude models: "claude-sonnet-4-5" -> "Claude Sonnet 4.5"
if (normalizedModel.includes("claude")) {
let formatted = modelId
.replace(/^claude[- ]/i, "Claude ")
.replace(/sonnet[- ](\d+)[- ](\d+)/i, "Sonnet $1.$2")
.replace(/sonnet[- ](\d+)/i, "Sonnet $1")
.replace(/haiku[- ](\d+)/i, "Haiku $1")
.replace(/opus[- ](\d+)/i, "Opus $1")
.replace(/sonnet/i, "Sonnet")
.replace(/haiku/i, "Haiku")
.replace(/opus/i, "Opus")
.replace(/-/g, " ")
.trim();
// Fix double spaces
formatted = formatted.replace(/\s+/g, " ");
return formatted.length > 30 ? formatted.slice(0, 30) + "…" : formatted;
}
// OpenAI models: "gpt-4o" -> "GPT-4o", "gpt-4-turbo" -> "GPT-4 Turbo"
if (normalizedModel.includes("gpt") || normalizedModel.includes("openai")) {
// Format GPT model names: handle special cases first, then capitalize
// Note: We don't replace hyphens globally because special cases preserve them
const formatted = modelId
.replace(/^gpt-4-turbo$/i, "GPT-4 Turbo")
.replace(/^gpt-4o-mini$/i, "GPT-4o Mini")
.replace(/^gpt-4o$/i, "GPT-4o")
.replace(/^gpt-4$/i, "GPT-4")
.replace(/^gpt-o1-preview$/i, "GPT-o1 Preview")
.replace(/^gpt-o1-mini$/i, "GPT-o1 Mini")
.replace(/^gpt-o1$/i, "GPT-o1")
.replace(/^gpt/i, "GPT") // Capitalize remaining GPT prefix
.trim();
return formatted.length > 30 ? formatted.slice(0, 30) + "…" : formatted;
}
// Gemini models: "gemini-2.5-pro" -> "Gemini 2.5 Pro"
if (normalizedModel.includes("gemini")) {
const formatted = modelId
.replace(/^gemini[- ]/i, "Gemini ")
.replace(/pro[- ](\d+)[- ](\d+)/i, "Pro $1.$2")
.replace(/pro[- ](\d+)/i, "Pro $1")
.replace(/-/g, " ")
.replace(/\s+/g, " ")
.trim();
return formatted.length > 30 ? formatted.slice(0, 30) + "…" : formatted;
}
// Generic fallback: capitalize first letter, replace hyphens with spaces
const formatted = modelId
.replace(/-/g, " ")
.replace(/^\w/, (c) => c.toUpperCase())
.replace(/\s+/g, " ")
.trim();
return formatted.length > 30 ? formatted.slice(0, 30) + "…" : formatted;
}
function truncateToolValue(value: string, maxLength: number): string {
if (value.length <= maxLength) return value;
return `${value.slice(0, maxLength)}`;
}
function formatToolArgsSummary(args?: Record<string, unknown>): string | null {
if (!args) return null;
const entries = Object.entries(args);
if (entries.length === 0) return null;
return entries
.map(([key, value]) => {
const stringValue =
typeof value === "string"
? value
: (() => {
try {
return JSON.stringify(value);
} catch {
return String(value);
}
})();
return `${key}=${truncateToolValue(stringValue, 50)}`;
})
.join(", ");
}
function formatToolResultSummary(result: unknown): string | null {
if (result === undefined) return null;
if (typeof result === "string") return truncateToolValue(result, 200);
try {
return truncateToolValue(JSON.stringify(result), 200);
} catch {
return truncateToolValue(String(result), 200);
}
}
function renderToolCalls(toolCalls?: ToolCallInfo[]): ReactNode {
if (!toolCalls || toolCalls.length === 0) return null;
const renderToolCallItem = (toolCall: ToolCallInfo, index: number) => {
const isRunning = toolCall.status === "running";
const isError = toolCall.status === "completed" && toolCall.isError;
const argsSummary = formatToolArgsSummary(toolCall.args);
const resultSummary = formatToolResultSummary(toolCall.result);
const summaryPreview = isRunning
? argsSummary
: resultSummary
? `result: ${resultSummary}`
: argsSummary
? `args: ${argsSummary}`
: null;
const statusLabel = isRunning ? "running" : isError ? "error" : "completed";
return (
<details
key={`${toolCall.toolName}-${index}`}
className={`chat-tool-call${isRunning ? " chat-tool-call--running" : ""}${isError ? " chat-tool-call--error" : ""}`}
open={isRunning}
>
<summary>
<span className="chat-tool-call-status-dot" aria-hidden="true" />
<span className="chat-tool-call-name">{toolCall.toolName}</span>
{summaryPreview && (
<span className="chat-tool-call-preview" title={summaryPreview}>
{summaryPreview}
</span>
)}
<span className="chat-tool-call-status-text">{statusLabel}</span>
</summary>
<div className="chat-tool-call-content">
{argsSummary && (
<div className="chat-tool-call-row">
<span className="chat-tool-call-label">args</span>
<span className="chat-tool-call-value">{argsSummary}</span>
</div>
)}
{resultSummary && (
<div className={`chat-tool-call-row${isError ? " chat-tool-call-row--error" : ""}`}>
<span className="chat-tool-call-label">result</span>
<span className="chat-tool-call-value">{resultSummary}</span>
</div>
)}
</div>
</details>
);
};
const className = "chat-tool-calls";
if (toolCalls.length === 1) {
return (
<div className={className} data-testid="chat-tool-calls">
<div className="chat-tool-calls-header">
<Wrench size={12} aria-hidden="true" />
<span>Tool calls</span>
</div>
{renderToolCallItem(toolCalls[0], 0)}
</div>
);
}
const runningCount = toolCalls.filter((toolCall) => toolCall.status === "running").length;
const errorCount = toolCalls.filter((toolCall) => toolCall.status === "completed" && toolCall.isError).length;
const hasRunning = runningCount > 0;
const uniqueNames = Array.from(new Set(toolCalls.map((toolCall) => toolCall.toolName)));
const visibleNames = uniqueNames.slice(0, 5);
const overflowCount = Math.max(0, uniqueNames.length - visibleNames.length);
const namesSummary = overflowCount > 0
? `${visibleNames.join(", ")}, +${overflowCount} more`
: visibleNames.join(", ");
const statusSummary = hasRunning
? `(${runningCount} running)`
: errorCount > 0
? `(${errorCount} ${errorCount === 1 ? "error" : "errors"})`
: null;
return (
<div className={className} data-testid="chat-tool-calls">
<details className="chat-tool-calls-group" data-testid="chat-tool-calls-group" open={hasRunning}>
<summary className="chat-tool-calls-group-summary">
<Wrench size={12} aria-hidden="true" />
<span>{toolCalls.length} tool calls</span>
<span className="chat-tool-calls-names" title={namesSummary}>{namesSummary}</span>
{statusSummary && <span className="chat-tool-calls-group-status">{statusSummary}</span>}
</summary>
{toolCalls.map((toolCall, index) => renderToolCallItem(toolCall, index))}
</details>
</div>
);
}
const chatMarkdownComponents: Components = {
pre: ({ children, ...props }) => (
<pre {...props} className="chat-markdown-pre">
{children}
</pre>
),
table: ({ children, ...props }) => (
<table {...props} className="chat-markdown-table">
{children}
</table>
),
};
/**
* Constant agent ID for the built-in fn agent.
* The chat system always uses createFnAgent with CHAT_SYSTEM_PROMPT regardless
* of the agentId stored on the session. This ID serves as metadata only.
*/
const FN_AGENT_ID = "__fn_agent__";
const CHAT_SIDEBAR_DEFAULT_WIDTH = 280;
const CHAT_SIDEBAR_MIN_WIDTH = 180;
const CHAT_SIDEBAR_MAX_WIDTH = 500;
const CHAT_SIDEBAR_STORAGE_KEY = "fusion:chat-sidebar-width";
interface PendingAttachment {
file: File;
previewUrl: string;
}
const ALLOWED_ATTACHMENT_TYPES = [
"image/png",
"image/jpeg",
"image/gif",
"image/webp",
"text/plain",
"application/json",
"text/yaml",
"text/markdown",
"text/csv",
"application/xml",
"text/x-log",
];
function getSkillTriggerMatch(value: string): { filter: string; start: number; end: number } | null {
const triggerMatch = /(^|[\s])\/([^\s]*)$/.exec(value);
if (!triggerMatch) {
return null;
}
const prefix = triggerMatch[1] ?? "";
const filter = triggerMatch[2] ?? "";
const start = triggerMatch.index + prefix.length;
return {
filter,
start,
end: value.length,
};
}
function getMentionTriggerMatch(
value: string,
cursorPos: number,
): { filter: string; start: number; end: number } | null {
const textBeforeCursor = value.slice(0, cursorPos);
const triggerMatch = /(^|[\s\n])@([\w-]*)$/.exec(textBeforeCursor);
if (!triggerMatch) {
return null;
}
const filter = triggerMatch[2] ?? "";
const start = textBeforeCursor.length - filter.length - 1;
return {
filter,
start,
end: cursorPos,
};
}
interface NewChatDialogProps {
projectId?: string;
onClose: () => void;
onCreate: (input: { agentId: string; modelProvider?: string; modelId?: string }) => void;
}
function NewChatDialog({ projectId, onClose, onCreate }: NewChatDialogProps) {
const [chatMode, setChatMode] = useState<"agent" | "model">("agent");
const [agents, setAgents] = useState<Agent[]>([]);
const [agentsLoading, setAgentsLoading] = useState(true);
const [selectedAgentId, setSelectedAgentId] = useState<string>("");
const [models, setModels] = useState<ModelInfo[]>([]);
const [modelsLoading, setModelsLoading] = useState(true);
const [selectedModel, setSelectedModel] = useState<string>("");
const [favoriteProviders, setFavoriteProviders] = useState<string[]>([]);
const [favoriteModels, setFavoriteModels] = useState<string[]>([]);
// Load agents on mount (project-scoped)
useEffect(() => {
let cancelled = false;
setAgentsLoading(true);
fetchAgents(undefined, projectId)
.then((response) => {
if (!cancelled) {
setAgents(response);
}
})
.catch(() => {
if (!cancelled) {
// Silently fail - show empty list
setAgents([]);
}
})
.finally(() => {
if (!cancelled) {
setAgentsLoading(false);
}
});
return () => {
cancelled = true;
};
}, [projectId]);
// Load models on mount
useEffect(() => {
setModelsLoading(true);
fetchModels()
.then((response) => {
setModels(response.models);
setFavoriteProviders(response.favoriteProviders);
setFavoriteModels(response.favoriteModels);
})
.catch(() => {
// Silently fail - show empty list
setModels([]);
setFavoriteProviders([]);
setFavoriteModels([]);
})
.finally(() => {
setModelsLoading(false);
});
}, []);
const handleToggleFavorite = useCallback(async (provider: string) => {
const currentFavorites = favoriteProviders;
const isFavorite = currentFavorites.includes(provider);
const newFavorites = isFavorite
? currentFavorites.filter((value) => value !== provider)
: [provider, ...currentFavorites];
setFavoriteProviders(newFavorites);
try {
await updateGlobalSettings({ favoriteProviders: newFavorites, favoriteModels });
} catch {
setFavoriteProviders(currentFavorites);
}
}, [favoriteProviders, favoriteModels]);
const handleToggleModelFavorite = useCallback(async (modelId: string) => {
const currentFavorites = favoriteModels;
const isFavorite = currentFavorites.includes(modelId);
const newFavorites = isFavorite
? currentFavorites.filter((value) => value !== modelId)
: [modelId, ...currentFavorites];
setFavoriteModels(newFavorites);
try {
await updateGlobalSettings({ favoriteProviders, favoriteModels: newFavorites });
} catch {
setFavoriteModels(currentFavorites);
}
}, [favoriteModels, favoriteProviders]);
const handleSubmit = (e: React.SyntheticEvent<HTMLFormElement>) => {
e.preventDefault();
if (chatMode === "agent") {
if (!selectedAgentId) return;
onCreate({ agentId: selectedAgentId });
return;
}
// model mode
if (!selectedModel) return;
const slashIdx = selectedModel.indexOf("/");
if (slashIdx <= 0) return;
const modelProvider = selectedModel.slice(0, slashIdx);
const modelId = selectedModel.slice(slashIdx + 1);
onCreate({ agentId: FN_AGENT_ID, modelProvider, modelId });
};
const isSubmitDisabled =
chatMode === "agent" ? !selectedAgentId : !selectedModel;
return (
<div className="chat-new-dialog-backdrop chat-view-dialog-backdrop" onClick={onClose} role="dialog" aria-modal="true">
<div className="chat-new-dialog chat-view-dialog" onClick={(e) => e.stopPropagation()}>
<h3>New Chat</h3>
<div className="chat-new-dialog-mode-toggle" data-testid="chat-new-dialog-mode-toggle">
<button
type="button"
className={`chat-new-dialog-mode-btn${chatMode === "agent" ? " chat-new-dialog-mode-btn--active" : ""}`}
data-testid="chat-new-dialog-mode-agent"
onClick={() => {
setChatMode("agent");
setSelectedModel("");
}}
>
Agent
</button>
<button
type="button"
className={`chat-new-dialog-mode-btn${chatMode === "model" ? " chat-new-dialog-mode-btn--active" : ""}`}
data-testid="chat-new-dialog-mode-model"
onClick={() => {
setChatMode("model");
setSelectedAgentId("");
}}
>
Model
</button>
</div>
<form onSubmit={handleSubmit}>
{chatMode === "agent" && (
<label className="chat-new-dialog-model-label">
Agent
{agentsLoading ? (
<div className="chat-new-dialog-loading">Loading agents...</div>
) : agents.length === 0 ? (
<div className="chat-new-dialog-empty">No agents available</div>
) : (
<div className="chat-new-dialog-agent-list">
{agents.map((agent) => (
<button
key={agent.id}
type="button"
className={`chat-new-dialog-agent-item${selectedAgentId === agent.id ? " chat-new-dialog-agent-item--selected" : ""}`}
onClick={() => setSelectedAgentId(agent.id)}
data-testid={`agent-option-${agent.id}`}
>
<Bot size={16} />
<span className="chat-new-dialog-agent-name">{agent.name}</span>
<span className="chat-new-dialog-agent-role">{agent.role}</span>
</button>
))}
</div>
)}
</label>
)}
{chatMode === "model" && (
<div className="chat-new-dialog-model-dropdown" data-testid="chat-new-dialog-model-section">
{modelsLoading ? (
<div className="chat-new-dialog-loading">Loading models...</div>
) : (
<CustomModelDropdown
models={models}
value={selectedModel}
onChange={setSelectedModel}
label="Model"
placeholder="Select a model"
favoriteProviders={favoriteProviders}
onToggleFavorite={handleToggleFavorite}
favoriteModels={favoriteModels}
onToggleModelFavorite={handleToggleModelFavorite}
/>
)}
</div>
)}
<div className="chat-new-dialog-actions">
<button type="button" className="btn btn-sm" onClick={onClose}>
Cancel
</button>
<button
type="submit"
className="btn btn-sm btn-primary"
disabled={isSubmitDisabled}
>
Create
</button>
</div>
</form>
</div>
</div>
);
}
interface ChatMessageItemProps {
message: ChatMessageInfo;
forcePlain: boolean;
agentName: string;
showAssistantModelTag: boolean;
activeModelTag: string | null;
activeSessionId: string | null;
mentionAgentsByName: Map<string, Agent>;
onToggleRender: (id: string) => void;
}
// Renders a single chat message bubble. Memoized so the streaming bubble's
// per-frame state churn does not re-render every prior message (each one
// would re-run ReactMarkdown over its full content otherwise).
const ChatMessageItem = memo(function ChatMessageItem({
message,
forcePlain,
agentName,
showAssistantModelTag,
activeModelTag,
activeSessionId,
mentionAgentsByName,
onToggleRender,
}: ChatMessageItemProps) {
const isAssistantMessage = message.role === "assistant";
const renderedUserContent = useMemo<ReactNode>(() => {
if (isAssistantMessage) return null;
const content = message.content;
const mentionRegex = /@([\w-]+)/g;
const parts: ReactNode[] = [];
let lastIndex = 0;
let match = mentionRegex.exec(content);
while (match) {
const [fullMatch, rawName = ""] = match;
const start = match.index;
if (start > lastIndex) parts.push(content.slice(lastIndex, start));
const normalizedName = rawName.replace(/_/g, " ").toLowerCase();
const mentionedAgent = mentionAgentsByName.get(normalizedName);
if (mentionedAgent) {
parts.push(
<span key={`${mentionedAgent.id}-${start}`} className="chat-mention-chip">
@{mentionedAgent.name.replace(/\s+/g, "_")}
</span>,
);
} else {
parts.push(fullMatch);
}
lastIndex = start + fullMatch.length;
match = mentionRegex.exec(content);
}
if (lastIndex < content.length) parts.push(content.slice(lastIndex));
return parts.length === 0 ? content : parts;
}, [isAssistantMessage, message.content, mentionAgentsByName]);
const renderedAttachments = useMemo<ReactNode>(() => {
const attachments = message.attachments;
if (!attachments || attachments.length === 0 || !activeSessionId) return null;
const attachmentUrlBase = `/api/chat/sessions/${encodeURIComponent(activeSessionId)}/attachments/`;
return (
<div className="chat-message-attachments">
{attachments.map((attachment) => {
const isImage = attachment.mimeType.startsWith("image/");
const key = attachment.id || attachment.filename;
const href = `${attachmentUrlBase}${encodeURIComponent(attachment.filename)}`;
if (isImage) {
return (
<a
key={key}
className="chat-message-attachment-link"
data-testid="chat-message-attachment"
href={href}
target="_blank"
rel="noopener noreferrer"
>
<img
className="chat-message-attachment"
src={href}
alt={attachment.originalName}
/>
</a>
);
}
return (
<a
key={key}
className="chat-message-attachment-file"
data-testid="chat-message-attachment"
href={href}
target="_blank"
rel="noopener noreferrer"
>
<File size={14} />
<span>{attachment.originalName}</span>
</a>
);
})}
</div>
);
}, [message.attachments, activeSessionId]);
const assistantBody = useMemo<ReactNode>(() => {
if (!isAssistantMessage) return null;
if (forcePlain) {
return <div className="chat-message-content chat-message-content--plain">{message.content}</div>;
}
return (
<div className="chat-message-content chat-message-content--markdown">
<ReactMarkdown remarkPlugins={[remarkGfm]} components={chatMarkdownComponents}>
{message.content}
</ReactMarkdown>
</div>
);
}, [isAssistantMessage, forcePlain, message.content]);
return (
<div
className={`chat-message chat-message--${message.role}`}
data-testid={`chat-message-${message.id}`}
>
{isAssistantMessage && (
<div className="chat-message-avatar">
<Bot size={14} />
<span>{agentName}</span>
{showAssistantModelTag && activeModelTag && <span className="chat-model-tag">{activeModelTag}</span>}
<button
type="button"
className={`chat-message-render-toggle${forcePlain ? " chat-message-render-toggle--plain" : ""}`}
data-testid="chat-message-render-toggle"
aria-label={forcePlain ? "Show rendered markdown" : "Show plain text"}
onClick={() => onToggleRender(message.id)}
>
{forcePlain ? <EyeOff size={14} /> : <Eye size={14} />}
</button>
</div>
)}
{isAssistantMessage
? assistantBody
: <div className="chat-message-content">{renderedUserContent}</div>}
{renderToolCalls(message.toolCalls)}
{message.thinkingOutput && (
<details className="chat-message-thinking">
<summary>Thinking</summary>
<pre className="chat-message-thinking-content">{message.thinkingOutput}</pre>
</details>
)}
{renderedAttachments}
<div className="chat-message-time">{formatRelativeTime(message.createdAt)}</div>
</div>
);
});
export function ChatView({ projectId, addToast }: ChatViewProps) {
const {
activeSession,
sessionsLoading,
messages,
messagesLoading,
isStreaming,
streamingText,
streamingThinking,
streamingToolCalls,
selectSession,
createSession,
archiveSession,
deleteSession,
sendMessage,
stopStreaming,
pendingMessage,
clearPendingMessage,
searchQuery,
setSearchQuery,
filteredSessions,
} = useChat(projectId, addToast);
const [showNewDialog, setShowNewDialog] = useState(false);
const [messageInput, setMessageInput] = useState("");
const [contextMenu, setContextMenu] = useState<{ sessionId: string; x: number; y: number } | null>(null);
const [confirmDelete, setConfirmDelete] = useState<string | null>(null);
const [sidebarVisible, setSidebarVisible] = useState(true);
const [sidebarWidth, setSidebarWidth] = useState(CHAT_SIDEBAR_DEFAULT_WIDTH);
const [agentsMap, setAgentsMap] = useState<Map<string, Agent>>(new Map());
const [discoveredSkills, setDiscoveredSkills] = useState<DiscoveredSkill[]>([]);
const [skillsLoading, setSkillsLoading] = useState(true);
const [showSkillMenu, setShowSkillMenu] = useState(false);
const [skillFilter, setSkillFilter] = useState("");
const [highlightedSkillIndex, setHighlightedSkillIndex] = useState(0);
const [mentionFilter, setMentionFilter] = useState("");
const [mentionPopupVisible, setMentionPopupVisible] = useState(false);
const [mentionHighlightIndex, setMentionHighlightIndex] = useState(0);
const [mentionStartPos, setMentionStartPos] = useState(-1);
const [plainTextMessageIds, setPlainTextMessageIds] = useState<Set<string>>(() => new Set());
// Attachment state mirrors QuickEntryBox: pending files selected before send.
const [pendingAttachments, setPendingAttachments] = useState<PendingAttachment[]>([]);
const [isDragOver, setIsDragOver] = useState(false);
// File mention state and hook
const [, setFileMentionPopupVisible] = useState(false);
const [fileMentionPosition, setFileMentionPosition] = useState({ top: 0, left: 0 });
const fileMention = useFileMention({ projectId });
// Calculate popup position based on caret position in textarea
const updateFileMentionPosition = useCallback((textarea: HTMLTextAreaElement | null) => {
if (!textarea || !fileMention.mentionActive) return;
// Get textarea position
const rect = textarea.getBoundingClientRect();
// Position above the textarea, using viewport coordinates
// The popup is absolutely positioned, so we use window coordinates
setFileMentionPosition({
top: rect.top - 260, // Popup appears above with gap (accounting for popup height)
left: rect.left + 8, // Small left offset
});
}, [fileMention.mentionActive]);
const messagesEndRef = useRef<HTMLDivElement>(null);
const hideSkillMenuTimeoutRef = useRef<number | null>(null);
const messagesContainerRef = useRef<HTMLDivElement>(null);
const inputRef = useRef<HTMLTextAreaElement>(null);
const preserveComposerFocusRef = useRef(false);
const handledMobileSendRef = useRef(false);
const fileInputRef = useRef<HTMLInputElement>(null);
const pendingAttachmentsRef = useRef<PendingAttachment[]>([]);
const mentionCursorPosRef = useRef(0);
const mode = useViewportMode();
const isMobile = mode === "mobile";
useEffect(() => {
try {
const rawWidth = localStorage.getItem(CHAT_SIDEBAR_STORAGE_KEY);
if (!rawWidth) return;
const parsedWidth = Number.parseInt(rawWidth, 10);
if (Number.isNaN(parsedWidth)) return;
const clampedWidth = Math.max(CHAT_SIDEBAR_MIN_WIDTH, Math.min(CHAT_SIDEBAR_MAX_WIDTH, parsedWidth));
setSidebarWidth(clampedWidth);
} catch {
// Ignore storage errors.
}
}, []);
const { keyboardOverlap, viewportHeight, viewportOffsetTop, keyboardOpen } = useMobileKeyboard({
enabled: isMobile && !!activeSession,
});
const threadKeyboardStyle: CSSProperties =
keyboardOpen
? ({
"--keyboard-overlap": `${keyboardOverlap}px`,
"--vv-offset-top": `${viewportOffsetTop}px`,
...(viewportHeight !== null ? { "--vv-height": `${viewportHeight}px` } : {}),
} as CSSProperties)
: {};
const filteredSkills = useMemo(() => {
const normalizedFilter = skillFilter.trim().toLowerCase();
const matchingSkills = normalizedFilter
? discoveredSkills.filter((skill) => skill.name.toLowerCase().includes(normalizedFilter))
: discoveredSkills;
return matchingSkills.slice(0, 10);
}, [discoveredSkills, skillFilter]);
const mentionAgents = useMemo(() => Array.from(agentsMap.values()), [agentsMap]);
const filteredMentionAgents = useMemo(() => {
const normalizedFilter = mentionFilter.trim().toLowerCase();
if (!normalizedFilter) {
return mentionAgents;
}
return mentionAgents.filter((agent) => agent.name.toLowerCase().includes(normalizedFilter));
}, [mentionAgents, mentionFilter]);
const mentionAgentsByName = useMemo(() => {
const byName = new Map<string, Agent>();
for (const agent of mentionAgents) {
byName.set(agent.name.toLowerCase(), agent);
}
return byName;
}, [mentionAgents]);
useEffect(() => {
setHighlightedSkillIndex(0);
}, [filteredSkills]);
useEffect(() => {
setMentionHighlightIndex(0);
}, [mentionFilter, mentionPopupVisible]);
useEffect(() => {
return () => {
if (hideSkillMenuTimeoutRef.current !== null) {
window.clearTimeout(hideSkillMenuTimeoutRef.current);
}
};
}, []);
// Scroll thread container to bottom on new messages or streaming.
// Avoid Element.scrollIntoView() here because on mobile Safari it can
// scroll the page viewport instead of only the chat thread.
useEffect(() => {
const messagesContainer = messagesContainerRef.current;
if (!messagesContainer) return;
messagesContainer.scrollTop = messagesContainer.scrollHeight;
}, [messages, streamingText, streamingThinking, isStreaming]);
useEffect(() => {
if (keyboardOverlap <= 0) {
return;
}
const messagesContainer = messagesContainerRef.current;
if (!messagesContainer) {
return;
}
messagesContainer.scrollTop = messagesContainer.scrollHeight;
}, [keyboardOverlap]);
// Lock body scroll on mobile while the keyboard is up so iOS can't shift
// the visual viewport (offsetTop > 0). Shared hook also restores
// window.scrollTo(0, 0) on cleanup to recover from any iOS drift.
useMobileScrollLock(isMobile && keyboardOpen);
// Close context menu on outside click
useEffect(() => {
const handleClick = () => setContextMenu(null);
if (contextMenu) {
document.addEventListener("click", handleClick);
return () => document.removeEventListener("click", handleClick);
}
}, [contextMenu]);
// Fetch agents on mount for name resolution (project-scoped with stale-request protection)
useEffect(() => {
let cancelled = false;
const currentProjectId = projectId;
fetchAgents(undefined, projectId)
.then((agents) => {
// Ignore response if project changed during fetch
if (cancelled || currentProjectId !== projectId) return;
const map = new Map<string, Agent>();
for (const agent of agents) {
map.set(agent.id, agent);
}
setAgentsMap(map);
})
.catch(() => {
// Silently fail - keep empty map
});
return () => {
cancelled = true;
};
}, [projectId]);
// Fetch discovered skills for slash command autocomplete
useEffect(() => {
let cancelled = false;
setSkillsLoading(true);
fetchDiscoveredSkills(projectId)
.then((skills) => {
if (!cancelled) {
setDiscoveredSkills(skills);
}
})
.catch(() => {
if (!cancelled) {
setDiscoveredSkills([]);
}
})
.finally(() => {
if (!cancelled) {
setSkillsLoading(false);
}
});
return () => {
cancelled = true;
};
}, [projectId]);
useEffect(() => {
pendingAttachmentsRef.current = pendingAttachments;
}, [pendingAttachments]);
useEffect(() => {
return () => {
for (const attachment of pendingAttachmentsRef.current) {
if (attachment.previewUrl) {
URL.revokeObjectURL(attachment.previewUrl);
}
}
};
}, []);
const handleAttachmentFiles = useCallback((files: FileList | File[] | null | undefined) => {
if (!files || files.length === 0) return;
const nextAttachments: PendingAttachment[] = [];
for (const file of Array.from(files)) {
if (!ALLOWED_ATTACHMENT_TYPES.includes(file.type)) {
continue;
}
const isImage = file.type.startsWith("image/");
nextAttachments.push({
file,
previewUrl: isImage ? URL.createObjectURL(file) : "",
});
}
if (nextAttachments.length > 0) {
setPendingAttachments((prev) => [...prev, ...nextAttachments]);
}
}, []);
const removeAttachment = useCallback((index: number) => {
setPendingAttachments((prev) => {
const attachment = prev[index];
if (attachment?.previewUrl) {
URL.revokeObjectURL(attachment.previewUrl);
}
return prev.filter((_, attachmentIndex) => attachmentIndex !== index);
});
}, []);
const handlePaste = useCallback((event: React.ClipboardEvent<HTMLTextAreaElement>) => {
const clipboardFiles = event.clipboardData?.files;
if (!clipboardFiles || clipboardFiles.length === 0) return;
const imageFiles = Array.from(clipboardFiles).filter((file) => file.type.startsWith("image/"));
if (imageFiles.length === 0) return;
handleAttachmentFiles(imageFiles);
}, [handleAttachmentFiles]);
// Handle create session
const handleCreateSession = useCallback(
async (input: { agentId: string; modelProvider?: string; modelId?: string }) => {
try {
await createSession(input);
setShowNewDialog(false);
// On mobile, hide sidebar after selecting
if (isMobile) setSidebarVisible(false);
} catch {
addToast("Failed to create chat session", "error");
}
},
[createSession, addToast, isMobile],
);
const clearComposerState = useCallback(() => {
setMessageInput("");
setShowSkillMenu(false);
setSkillFilter("");
setMentionPopupVisible(false);
setMentionFilter("");
setMentionStartPos(-1);
setPendingAttachments((prev) => {
for (const attachment of prev) {
if (attachment.previewUrl) {
URL.revokeObjectURL(attachment.previewUrl);
}
}
return [];
});
}, []);
// Handle send message including pending attachment uploads.
const handleSend = useCallback(() => {
const trimmed = messageInput.trim();
const files = pendingAttachments.map((attachment) => attachment.file);
if ((!trimmed && files.length === 0) || !activeSession) return;
if (trimmed === "/clear") {
clearComposerState();
stopStreaming();
clearPendingMessage();
void createSession({
agentId: activeSession.agentId,
modelProvider: activeSession.modelProvider ?? undefined,
modelId: activeSession.modelId ?? undefined,
}).catch(() => {
addToast("Failed to clear conversation", "error");
});
return;
}
clearComposerState();
sendMessage(trimmed, files);
}, [
messageInput,
pendingAttachments,
activeSession,
clearComposerState,
stopStreaming,
clearPendingMessage,
createSession,
addToast,
sendMessage,
]);
const focusComposerInput = useCallback(() => {
if (typeof window === "undefined") return;
if (window.innerWidth > 768) return;
const input = inputRef.current;
if (!input || input.disabled) return;
const previousScrollX = window.scrollX;
const previousScrollY = window.scrollY;
input.focus({ preventScroll: true });
// iOS can still jump layout viewport on focus changes even with preventScroll.
// Restore scroll position on the next frame to keep the thread anchored.
window.requestAnimationFrame(() => {
if (window.scrollX !== previousScrollX || window.scrollY !== previousScrollY) {
window.scrollTo(previousScrollX, previousScrollY);
}
});
}, []);
const markPreserveComposerFocus = useCallback(() => {
if (typeof window === "undefined") return;
if (window.innerWidth > 768) return;
preserveComposerFocusRef.current = true;
}, []);
const handleSkillSelect = useCallback(
(skill: DiscoveredSkill) => {
setMessageInput((currentInput) => {
const triggerMatch = getSkillTriggerMatch(currentInput);
if (!triggerMatch) {
return currentInput;
}
const replacement = `/skill:${skill.name} `;
const nextInput =
currentInput.slice(0, triggerMatch.start) + replacement + currentInput.slice(triggerMatch.end);
window.requestAnimationFrame(() => {
if (!inputRef.current) return;
inputRef.current.style.height = "auto";
inputRef.current.style.height = `${Math.min(inputRef.current.scrollHeight, 120)}px`;
inputRef.current.focus();
});
return nextInput;
});
setShowSkillMenu(false);
setSkillFilter("");
setHighlightedSkillIndex(0);
},
[],
);
const handleMentionSelect = useCallback(
(agent: Agent) => {
const textarea = inputRef.current;
if (!textarea || mentionStartPos < 0) {
return;
}
const selectionStart = textarea.selectionStart ?? mentionCursorPosRef.current;
const selectionEnd = textarea.selectionEnd ?? selectionStart;
const cursorPos = Math.max(selectionStart, selectionEnd);
const safeStart = Math.min(mentionStartPos, cursorPos);
const mentionText = `@${agent.name.replace(/\s+/g, "_")}`;
const replacement = `${mentionText} `;
const nextInput = messageInput.slice(0, safeStart) + replacement + messageInput.slice(cursorPos);
const nextCursorPos = safeStart + replacement.length;
setMessageInput(nextInput);
setMentionPopupVisible(false);
setMentionFilter("");
setMentionHighlightIndex(0);
setMentionStartPos(-1);
window.requestAnimationFrame(() => {
if (!inputRef.current) return;
inputRef.current.style.height = "auto";
inputRef.current.style.height = `${Math.min(inputRef.current.scrollHeight, 120)}px`;
inputRef.current.focus();
inputRef.current.setSelectionRange(nextCursorPos, nextCursorPos);
});
},
[mentionStartPos, messageInput],
);
// Handle input key down
const handleInputKeyDown = useCallback(
(e: React.KeyboardEvent<HTMLTextAreaElement>) => {
mentionCursorPosRef.current = e.currentTarget.selectionStart ?? mentionCursorPosRef.current;
// Handle file mention popup keyboard navigation first
if (fileMention.mentionActive && fileMention.files.length > 0) {
fileMention.handleKeyDown(e, messageInput);
if (e.key === "Enter" || e.key === "Tab") {
// Select the highlighted file
const file = fileMention.files[fileMention.selectedIndex];
if (file) {
const newText = fileMention.selectFile(file, messageInput);
setMessageInput(newText);
fileMention.dismissMention();
setFileMentionPopupVisible(false);
}
}
return;
}
if (mentionPopupVisible && e.key === "ArrowDown") {
e.preventDefault();
if (filteredMentionAgents.length > 0) {
setMentionHighlightIndex((prev) => (prev + 1) % filteredMentionAgents.length);
}
return;
}
if (mentionPopupVisible && e.key === "ArrowUp") {
e.preventDefault();
if (filteredMentionAgents.length > 0) {
setMentionHighlightIndex((prev) =>
prev === 0 ? filteredMentionAgents.length - 1 : prev - 1,
);
}
return;
}
if (mentionPopupVisible && e.key === "Enter") {
e.preventDefault();
const agentToSelect = filteredMentionAgents[mentionHighlightIndex] ?? filteredMentionAgents[0];
if (agentToSelect) {
handleMentionSelect(agentToSelect);
}
return;
}
if (mentionPopupVisible && e.key === "Escape") {
e.preventDefault();
setMentionPopupVisible(false);
setMentionFilter("");
setMentionStartPos(-1);
return;
}
if (showSkillMenu && e.key === "ArrowDown") {
e.preventDefault();
if (filteredSkills.length > 0) {
setHighlightedSkillIndex((prev) => (prev + 1) % filteredSkills.length);
}
return;
}
if (showSkillMenu && e.key === "ArrowUp") {
e.preventDefault();
if (filteredSkills.length > 0) {
setHighlightedSkillIndex((prev) =>
prev === 0 ? filteredSkills.length - 1 : prev - 1,
);
}
return;
}
if (showSkillMenu && (e.key === "Enter" || e.key === "Tab") && filteredSkills.length > 0) {
e.preventDefault();
const skillToSelect = filteredSkills[highlightedSkillIndex] ?? filteredSkills[0];
if (skillToSelect) {
handleSkillSelect(skillToSelect);
}
return;
}
if (showSkillMenu && e.key === "Escape") {
e.preventDefault();
setShowSkillMenu(false);
return;
}
if (e.key === "Enter" && !e.shiftKey) {
e.preventDefault();
void handleSend();
}
},
[
mentionPopupVisible,
filteredMentionAgents,
mentionHighlightIndex,
handleMentionSelect,
showSkillMenu,
filteredSkills,
highlightedSkillIndex,
handleSkillSelect,
handleSend,
fileMention,
messageInput,
],
);
const updateMentionState = useCallback((value: string, cursorPos: number) => {
const mentionTriggerMatch = getMentionTriggerMatch(value, cursorPos);
if (mentionTriggerMatch) {
setMentionPopupVisible(true);
setMentionFilter(mentionTriggerMatch.filter);
setMentionStartPos(mentionTriggerMatch.start);
return;
}
setMentionPopupVisible(false);
setMentionFilter("");
setMentionStartPos(-1);
}, []);
// Handle textarea resize
const handleInputChange = useCallback((e: React.ChangeEvent<HTMLTextAreaElement>) => {
const textarea = e.target;
const nextValue = textarea.value;
const cursorPos = textarea.selectionStart ?? nextValue.length;
mentionCursorPosRef.current = cursorPos;
setMessageInput(nextValue);
const skillTriggerMatch = getSkillTriggerMatch(nextValue);
if (skillTriggerMatch) {
setShowSkillMenu(true);
setSkillFilter(skillTriggerMatch.filter);
} else {
setShowSkillMenu(false);
setSkillFilter("");
}
updateMentionState(nextValue, cursorPos);
// Detect file mentions
fileMention.detectMention(nextValue, cursorPos);
setFileMentionPopupVisible(fileMention.mentionActive);
if (fileMention.mentionActive) {
updateFileMentionPosition(textarea);
}
textarea.style.height = "auto";
textarea.style.height = `${Math.min(textarea.scrollHeight, 120)}px`;
}, [updateMentionState]);
const handleInputSelectionChange = useCallback(
(e: React.SyntheticEvent<HTMLTextAreaElement>) => {
const textarea = e.currentTarget;
const cursorPos = textarea.selectionStart ?? textarea.value.length;
mentionCursorPosRef.current = cursorPos;
updateMentionState(textarea.value, cursorPos);
// Detect file mentions
fileMention.detectMention(textarea.value, cursorPos);
setFileMentionPopupVisible(fileMention.mentionActive);
if (fileMention.mentionActive) {
updateFileMentionPosition(textarea);
}
},
[updateMentionState, fileMention, updateFileMentionPosition],
);
const handleInputKeyUp = useCallback(
(e: React.KeyboardEvent<HTMLTextAreaElement>) => {
if (e.key === "Escape") {
return;
}
handleInputSelectionChange(e);
},
[handleInputSelectionChange],
);
const handleInputBlur = useCallback(() => {
if (preserveComposerFocusRef.current) {
window.requestAnimationFrame(() => {
focusComposerInput();
});
return;
}
if (hideSkillMenuTimeoutRef.current !== null) {
window.clearTimeout(hideSkillMenuTimeoutRef.current);
}
hideSkillMenuTimeoutRef.current = window.setTimeout(() => {
setShowSkillMenu(false);
setMentionPopupVisible(false);
setMentionFilter("");
setMentionStartPos(-1);
setFileMentionPopupVisible(false);
fileMention.dismissMention();
hideSkillMenuTimeoutRef.current = null;
}, 120);
}, [fileMention, focusComposerInput]);
const handleInputFocus = useCallback(() => {
if (hideSkillMenuTimeoutRef.current !== null) {
window.clearTimeout(hideSkillMenuTimeoutRef.current);
hideSkillMenuTimeoutRef.current = null;
}
}, []);
// Handle archive
const handleArchive = useCallback(
async (id: string) => {
setContextMenu(null);
try {
await archiveSession(id);
addToast("Conversation archived", "success");
} catch {
addToast("Failed to archive conversation", "error");
}
},
[archiveSession, addToast],
);
// Handle delete
const handleDelete = useCallback(
async (id: string) => {
setConfirmDelete(null);
setContextMenu(null);
try {
await deleteSession(id);
addToast("Conversation deleted", "success");
} catch {
addToast("Failed to delete conversation", "error");
}
},
[deleteSession, addToast],
);
const persistSidebarWidth = useCallback((width: number) => {
try {
localStorage.setItem(CHAT_SIDEBAR_STORAGE_KEY, String(width));
} catch {
// Ignore storage errors.
}
}, []);
const handleResizeStart = useCallback((event: React.PointerEvent<HTMLDivElement>) => {
if (isMobile) {
return;
}
event.preventDefault();
event.stopPropagation();
const resizeHandle = event.currentTarget;
if (typeof resizeHandle.setPointerCapture === "function") {
resizeHandle.setPointerCapture(event.pointerId);
}
const startX = event.clientX;
const startWidth = sidebarWidth;
let latestWidth = startWidth;
document.body.style.userSelect = "none";
const onPointerMove = (moveEvent: PointerEvent) => {
const deltaX = moveEvent.clientX - startX;
const nextWidth = Math.max(CHAT_SIDEBAR_MIN_WIDTH, Math.min(CHAT_SIDEBAR_MAX_WIDTH, startWidth + deltaX));
latestWidth = nextWidth;
setSidebarWidth(nextWidth);
persistSidebarWidth(nextWidth);
};
const onPointerUp = (upEvent: PointerEvent) => {
if (typeof resizeHandle.releasePointerCapture === "function") {
resizeHandle.releasePointerCapture(upEvent.pointerId);
}
document.body.style.userSelect = "";
document.removeEventListener("pointermove", onPointerMove);
document.removeEventListener("pointerup", onPointerUp);
persistSidebarWidth(latestWidth);
};
document.addEventListener("pointermove", onPointerMove);
document.addEventListener("pointerup", onPointerUp);
}, [isMobile, persistSidebarWidth, sidebarWidth]);
const handleResizeKeyDown = useCallback((event: React.KeyboardEvent<HTMLDivElement>) => {
if (isMobile) {
return;
}
if (event.key !== "ArrowLeft" && event.key !== "ArrowRight") {
return;
}
event.preventDefault();
const step = event.shiftKey ? 50 : 10;
const delta = event.key === "ArrowLeft" ? -step : step;
const nextWidth = Math.max(CHAT_SIDEBAR_MIN_WIDTH, Math.min(CHAT_SIDEBAR_MAX_WIDTH, sidebarWidth + delta));
setSidebarWidth(nextWidth);
persistSidebarWidth(nextWidth);
}, [isMobile, persistSidebarWidth, sidebarWidth]);
// Handle session click
const handleSessionClick = useCallback(
(id: string) => {
selectSession(id);
if (isMobile) setSidebarVisible(false);
},
[selectSession, isMobile],
);
// Handle back to sidebar (mobile)
const handleBack = useCallback(() => {
selectSession("");
setSidebarVisible(true);
}, [selectSession]);
// Render empty state (no active session)
const renderEmptyState = () => {
return (
<div className="chat-empty-state">
<MessageSquare size={48} strokeWidth={1.5} />
<h2>Start a new conversation</h2>
<button className="btn btn-primary" onClick={() => setShowNewDialog(true)}>
<Plus size={16} />
New Chat
</button>
</div>
);
};
const activeModelTag = formatModelTag(activeSession?.modelProvider, activeSession?.modelId);
const threadHeaderTitle = activeSession?.agentId === FN_AGENT_ID
? (activeModelTag ?? "Fusion")
: activeSession?.title || agentsMap.get(activeSession?.agentId ?? "")?.name || activeSession?.agentId || "Chat";
const showThreadHeaderModelTag = Boolean(activeModelTag && activeModelTag !== threadHeaderTitle);
const agentName =
agentsMap.get(activeSession?.agentId ?? "")?.name ||
(activeSession?.agentId === FN_AGENT_ID
? (activeModelTag ?? "Fusion")
: (activeSession?.agentId?.slice(0, 30) ?? "Fusion"));
const showAssistantModelTag = Boolean(activeModelTag && activeModelTag !== agentName);
const pendingPreview = pendingMessage.length > 50
? `${pendingMessage.slice(0, 50)}`
: pendingMessage;
const toggleMessageRenderMode = useCallback((messageId: string) => {
setPlainTextMessageIds((current) => {
const next = new Set(current);
if (next.has(messageId)) {
next.delete(messageId);
} else {
next.add(messageId);
}
return next;
});
}, []);
const renderAssistantContent = useCallback(
(content: string, forcePlain = false) => {
const showPlainText = forcePlain;
if (showPlainText) {
return <div className="chat-message-content chat-message-content--plain">{content}</div>;
}
return (
<div className="chat-message-content chat-message-content--markdown">
<ReactMarkdown remarkPlugins={[remarkGfm]} components={chatMarkdownComponents}>
{content}
</ReactMarkdown>
</div>
);
},
[],
);
return (
<div className="chat-view">
{/* Sidebar */}
<div
className={`chat-sidebar${!sidebarVisible ? " chat-sidebar--hidden" : ""}`}
style={isMobile ? undefined : { width: `${sidebarWidth}px` }}
>
{/* Search section */}
<div className="chat-sidebar-search">
<div className="chat-sidebar-search-wrapper">
<Search size={14} className="chat-sidebar-search-icon" />
<input
type="text"
className="chat-sidebar-search"
placeholder="Search conversations..."
value={searchQuery}
onChange={(e) => setSearchQuery(e.target.value)}
data-testid="chat-search-input"
/>
</div>
</div>
{/* Session list section */}
<div className="chat-session-list chat-sidebar-list">
{sessionsLoading ? (
<div style={{ padding: "12px", color: "var(--text-secondary)", fontSize: "13px" }}>
Loading...
</div>
) : filteredSessions.length === 0 ? (
<div style={{ padding: "12px", color: "var(--text-secondary)", fontSize: "13px" }}>
No conversations yet
</div>
) : (
filteredSessions.map((session) => (
<div
key={session.id}
className={`chat-session-item${activeSession?.id === session.id ? " chat-session-item--active" : ""}`}
onClick={() => handleSessionClick(session.id)}
onContextMenu={(e) => {
e.preventDefault();
setContextMenu({ sessionId: session.id, x: e.clientX, y: e.clientY });
}}
data-testid={`chat-session-${session.id}`}
>
<button
className="chat-session-delete-btn"
onClick={(e) => {
e.stopPropagation();
setConfirmDelete(session.id);
}}
data-testid="chat-session-delete-btn"
aria-label="Delete conversation"
>
<Trash2 size={14} />
</button>
<div className="chat-session-title">{session.title || "Untitled"}</div>
<div className="chat-session-preview">
{session.lastMessagePreview || "No messages"}
</div>
<div className="chat-session-meta">
<span>
{agentsMap.get(session.agentId)?.name ||
(session.agentId === FN_AGENT_ID
? (formatModelTag(session.modelProvider, session.modelId) ?? "Fusion")
: session.agentId.slice(0, 30))}
</span>
<span>{session.updatedAt ? formatRelativeTime(session.updatedAt) : ""}</span>
</div>
</div>
))
)}
</div>
{/* Mobile footer with New Chat action */}
<div className="chat-sidebar-footer">
<button
className="btn btn-sm btn-primary chat-sidebar-footer-btn"
onClick={() => setShowNewDialog(true)}
data-testid="chat-new-btn"
>
<Plus size={14} />
New Chat
</button>
</div>
</div>
{!isMobile && sidebarVisible && (
<div
className="chat-sidebar-resize-handle"
role="separator"
aria-orientation="vertical"
aria-valuemin={CHAT_SIDEBAR_MIN_WIDTH}
aria-valuemax={CHAT_SIDEBAR_MAX_WIDTH}
aria-valuenow={sidebarWidth}
aria-label="Resize chat sidebar"
tabIndex={0}
onPointerDown={handleResizeStart}
onKeyDown={handleResizeKeyDown}
/>
)}
{/* Context Menu */}
{contextMenu && (
<div
className="chat-session-context-menu"
style={{ top: contextMenu.y, left: contextMenu.x }}
onClick={(e) => e.stopPropagation()}
>
<button
onClick={() => handleArchive(contextMenu.sessionId)}
data-testid="chat-context-archive"
>
<Archive size={14} />
Archive
</button>
<button
onClick={() => {
setContextMenu(null);
setConfirmDelete(contextMenu.sessionId);
}}
data-testid="chat-context-delete"
>
<Trash2 size={14} />
Delete
</button>
</div>
)}
{/* Confirm Delete Dialog */}
{confirmDelete && (
<div className="chat-new-dialog-backdrop chat-view-dialog-backdrop" onClick={() => setConfirmDelete(null)}>
<div className="chat-new-dialog chat-view-dialog" onClick={(e) => e.stopPropagation()}>
<h3>Delete Conversation?</h3>
<p className="chat-view-delete-dialog-copy">
This action cannot be undone. All messages in this conversation will be permanently deleted.
</p>
<div className="chat-new-dialog-actions">
<button className="btn btn-sm" onClick={() => setConfirmDelete(null)}>
Cancel
</button>
<button
className="btn btn-sm btn-danger"
onClick={() => void handleDelete(confirmDelete)}
>
Delete
</button>
</div>
</div>
</div>
)}
{/* Thread */}
<div className="chat-thread" style={threadKeyboardStyle}>
{/* Header - always rendered in desktop/tablet, only rendered in mobile when viewing a thread */}
{(activeSession || !isMobile) && (
<div className="chat-thread-header">
{isMobile && activeSession && (
<button className="btn-icon" onClick={handleBack} data-testid="chat-back-btn">
<ChevronLeft size={16} />
</button>
)}
<Bot size={16} />
<span className="chat-thread-header-title">{threadHeaderTitle}</span>
{showThreadHeaderModelTag && <span className="chat-model-tag">{activeModelTag}</span>}
{!isMobile && (
<button
className="btn btn-sm btn-primary chat-thread-header-new-chat"
onClick={() => setShowNewDialog(true)}
data-testid="chat-thread-new-chat-btn"
>
<Plus size={14} />
New Chat
</button>
)}
</div>
)}
{/* Messages */}
<div className="chat-messages" ref={messagesContainerRef}>
{isStreaming ? (
<>
{messages.map((message) => (
<ChatMessageItem
key={message.id}
message={message}
forcePlain={plainTextMessageIds.has(message.id)}
agentName={agentName}
showAssistantModelTag={showAssistantModelTag}
activeModelTag={activeModelTag}
activeSessionId={activeSession?.id ?? null}
mentionAgentsByName={mentionAgentsByName}
onToggleRender={toggleMessageRenderMode}
/>
))}
<div className="chat-message chat-message--assistant chat-message--streaming">
<div className="chat-message-avatar">
<Bot size={14} />
<span>{agentName}</span>
{showAssistantModelTag && <span className="chat-model-tag">{activeModelTag}</span>}
<button
type="button"
className={`chat-message-render-toggle${plainTextMessageIds.has("__streaming__") ? " chat-message-render-toggle--plain" : ""}`}
data-testid="chat-message-render-toggle"
aria-label={plainTextMessageIds.has("__streaming__") ? "Show rendered markdown" : "Show plain text"}
onClick={() => toggleMessageRenderMode("__streaming__")}
>
{plainTextMessageIds.has("__streaming__") ? <EyeOff size={14} /> : <Eye size={14} />}
</button>
</div>
{streamingText ? (
renderAssistantContent(streamingText, plainTextMessageIds.has("__streaming__"))
) : (
<div className="chat-message-content chat-message-content--waiting">
{streamingThinking ? "Thinking…" : "Connecting…"}
</div>
)}
{renderToolCalls(streamingToolCalls)}
{streamingThinking && (
<details className="chat-message-thinking">
<summary>Thinking</summary>
<pre className="chat-message-thinking-content">{streamingThinking}</pre>
</details>
)}
<div className="chat-typing-indicator">
<span />
<span />
<span />
</div>
</div>
</>
) : messagesLoading ? (
<div style={{ color: "var(--text-secondary)", fontSize: "13px" }}>Loading messages...</div>
) : messages.length === 0 && !activeSession ? (
renderEmptyState()
) : messages.length === 0 && activeSession ? (
<div style={{ color: "var(--text-secondary)", fontSize: "13px" }}>
No messages yet. Start the conversation!
</div>
) : (
<>
{messages.map((message) => (
<ChatMessageItem
key={message.id}
message={message}
forcePlain={plainTextMessageIds.has(message.id)}
agentName={agentName}
showAssistantModelTag={showAssistantModelTag}
activeModelTag={activeModelTag}
activeSessionId={activeSession?.id ?? null}
mentionAgentsByName={mentionAgentsByName}
onToggleRender={toggleMessageRenderMode}
/>
))}
</>
)}
<div ref={messagesEndRef} />
</div>
{/* Input */}
{activeSession && (
<div className="chat-input-area">
<input
ref={fileInputRef}
type="file"
accept="image/*,.txt,.json,.yaml,.yml,.log,.csv,.xml,.md"
multiple
style={{ display: "none" }}
onChange={(event) => {
handleAttachmentFiles(event.target.files);
event.target.value = "";
}}
/>
{showSkillMenu && (
<div className="chat-skill-menu" data-testid="chat-skill-menu" role="listbox" aria-label="Skill suggestions">
{skillsLoading ? (
<div className="chat-skill-menu-empty">Loading skills</div>
) : filteredSkills.length === 0 ? (
<div className="chat-skill-menu-empty">
{skillFilter ? "No skills found" : "No skills available"}
</div>
) : (
filteredSkills.map((skill, index) => (
<button
key={skill.id}
type="button"
role="option"
aria-selected={index === highlightedSkillIndex}
className={`chat-skill-menu-item${index === highlightedSkillIndex ? " chat-skill-menu-item--highlighted" : ""}`}
onMouseDown={(e) => e.preventDefault()}
onMouseEnter={() => setHighlightedSkillIndex(index)}
onClick={() => handleSkillSelect(skill)}
>
<span className="chat-skill-menu-item-name">{skill.name}</span>
<span className="chat-skill-menu-item-description" title={skill.relativePath}>
{skill.relativePath}
</span>
</button>
))
)}
</div>
)}
{pendingAttachments.length > 0 && (
<div className="chat-attachment-previews" data-testid="chat-attachment-previews">
{pendingAttachments.map((attachment, index) => (
<div
key={attachment.previewUrl || `${attachment.file.name}-${index}`}
className="chat-attachment-preview"
data-testid={`chat-attachment-preview-${index}`}
>
{attachment.previewUrl ? (
<img src={attachment.previewUrl} alt={attachment.file.name} />
) : (
<span className="chat-attachment-preview-name">{attachment.file.name}</span>
)}
<button
type="button"
className="chat-attachment-remove"
onClick={() => removeAttachment(index)}
data-testid={`chat-attachment-remove-${index}`}
aria-label={`Remove ${attachment.file.name}`}
>
×
</button>
</div>
))}
</div>
)}
<div className="chat-input-row">
<button
type="button"
className="btn-icon chat-attach-btn"
data-testid="chat-attach-btn"
aria-label="Attach files"
onClick={() => fileInputRef.current?.click()}
>
<Paperclip size={16} />
</button>
<div
className={`chat-input-wrapper${isDragOver ? " chat-input-wrapper--dragover" : ""}`}
onDragOver={(event) => {
event.preventDefault();
setIsDragOver(true);
}}
onDragLeave={() => setIsDragOver(false)}
onDrop={(event) => {
event.preventDefault();
setIsDragOver(false);
handleAttachmentFiles(event.dataTransfer.files);
}}
>
<textarea
ref={inputRef}
className="chat-input-textarea"
placeholder="Type a message..."
value={messageInput}
onChange={handleInputChange}
onKeyDown={handleInputKeyDown}
onKeyUp={handleInputKeyUp}
onClick={handleInputSelectionChange}
onBlur={handleInputBlur}
onFocus={handleInputFocus}
onPaste={handlePaste}
onTouchStart={(event) => {
if (typeof window === "undefined") return;
if (window.innerWidth > 768) return;
if (document.activeElement === event.currentTarget) return;
event.preventDefault();
event.currentTarget.focus({ preventScroll: true });
}}
rows={1}
data-testid="chat-input"
/>
<AgentMentionPopup
agents={mentionAgents}
filter={mentionFilter}
highlightedIndex={mentionHighlightIndex}
visible={mentionPopupVisible}
onSelect={handleMentionSelect}
position="below"
/>
<FileMentionPopup
visible={fileMention.mentionActive && !mentionPopupVisible}
position={fileMentionPosition}
files={fileMention.files}
selectedIndex={fileMention.selectedIndex}
onSelect={(file) => {
const newText = fileMention.selectFile(file, messageInput);
setMessageInput(newText);
fileMention.dismissMention();
setFileMentionPopupVisible(false);
inputRef.current?.focus();
}}
loading={fileMention.loading}
/>
{pendingMessage && (
<div className="chat-pending-message" data-testid="chat-pending-indicator">
<span>{`Queued: ${pendingPreview}`}</span>
<button
type="button"
className="chat-pending-message-dismiss"
aria-label="Dismiss queued message"
data-testid="chat-pending-dismiss"
onClick={clearPendingMessage}
>
×
</button>
</div>
)}
</div>
{isStreaming ? (
<button
className="chat-input-stop"
onClick={stopStreaming}
aria-label="Stop generation"
data-testid="chat-stop-btn"
>
<Square size={14} />
</button>
) : (
<button
type="button"
className="chat-input-send"
onPointerDown={(event) => {
if (typeof window === "undefined" || window.innerWidth > 768) return;
event.preventDefault();
if (event.pointerType && event.pointerType !== "mouse") {
handledMobileSendRef.current = true;
markPreserveComposerFocus();
focusComposerInput();
void handleSend();
window.setTimeout(() => {
preserveComposerFocusRef.current = false;
}, 1500);
}
}}
onTouchStart={(event) => {
if (typeof window === "undefined" || window.innerWidth > 768) return;
event.preventDefault();
handledMobileSendRef.current = true;
markPreserveComposerFocus();
focusComposerInput();
void handleSend();
window.setTimeout(() => {
preserveComposerFocusRef.current = false;
}, 1500);
}}
onMouseDown={(event) => {
if (typeof window === "undefined" || window.innerWidth > 768) return;
event.preventDefault();
}}
onClick={() => {
if (handledMobileSendRef.current) {
handledMobileSendRef.current = false;
return;
}
void handleSend();
}}
disabled={!messageInput.trim() && pendingAttachments.length === 0}
data-testid="chat-send-btn"
>
<Send size={16} />
</button>
)}
</div>
</div>
)}
</div>
{/* New Chat Dialog (rendered at root level) */}
{showNewDialog && (
<NewChatDialog
projectId={projectId}
onClose={() => setShowNewDialog(false)}
onCreate={handleCreateSession}
/>
)}
</div>
);
}