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import { ScrollArea } from "@/components/ui/scroll-area";
import { Button } from "@/components/ui/button";
import { Trash2, Monitor } from "lucide-react";
import type { OutputLine } from "@shared/schema";
interface SerialMonitorProps {
readonly output: OutputLine[];
readonly isConnected: boolean;
readonly isSimulationRunning: boolean;
readonly onSendMessage: (message: string) => void;
readonly onClear: () => void;
readonly showMonitor?: boolean;
readonly autoScrollEnabled?: boolean;
readonly headerActions?: ReactNode;
readonly showHeader?: boolean;
}
interface ProcessedLine {
text: string;
incomplete: boolean;
}
const ROW_HEIGHT = 20; // Exact line height in pixels (matches Monaco editor: 14px font + 20px line-height)
const OVERSCAN_COUNT = 10; // Extra lines above/below viewport for smooth scrolling
const ENABLE_VIRTUAL_SCROLL = true; // Feature flag for virtual scrolling
const ENABLE_RAF_BATCHING = typeof process !== 'undefined' && process.env.NODE_ENV !== 'test'; // Disable rAF in tests
// Simple ANSI escape code processor
// NOTE: Backspace (\b) is handled separately in applyBackspaceAcrossLines for cross-line support
function processAnsiCodes(text: string): string {
const ESC = String.fromCodePoint(0x1b);
const ESC_2J = `${ESC}[2J`;
const ESC_H = `${ESC}[H`;
const ESC_K = `${ESC}[K`;
const ANSI_COLOR_RE = new RegExp(String.raw`${ESC}\[[0-9;]*m`, "g");
let processed = text.replaceAll(ESC_2J, "").replaceAll(ESC_H, "");
processed = processed.replaceAll(ESC_K, "").replaceAll(ANSI_COLOR_RE, "");
// Backspace within the SAME chunk: apply locally
// (Cross-chunk backspaces are handled in applyBackspaceAcrossLines)
if (processed.includes("\b")) {
let out = "";
for (const ch of processed) {
if (ch === "\b") {
out = out.slice(0, -1);
} else {
out += ch;
}
}
processed = out;
}
// Expand tabs to 4 spaces
if (processed.includes("\t")) {
processed = processed.replaceAll("\t", " ");
}
// Bell character: replace with visible marker (so it's not silently dropped)
if (processed.includes("\x07")) {
processed = processed.replaceAll("\x07", "␇");
}
// Form feed and vertical tab => normalize to newline
if (processed.includes("\f") || processed.includes("\v")) {
processed = processed.replaceAll("\f", "\n").replaceAll("\v", "\n");
}
return processed;
}
/**
* Strips leading backspace characters from text and removes corresponding
* characters from the last incomplete line.
*/
function consumeLeadingBackspaces(
lines: Array<{ text: string; incomplete: boolean }>,
text: string,
): string {
let idx = 0;
while (idx < text.length && text[idx] === "\b") {
idx++;
}
if (idx === 0) return text;
const lastLine = lines.at(-1);
if (!lastLine?.incomplete) return text;
lastLine.text = lastLine.text.slice(
0,
Math.max(0, lastLine.text.length - idx),
);
return text.slice(idx);
}
// Exported for unit testing and reuse inside the hook
export function applyBackspaceAcrossLines(
lines: Array<{ text: string; incomplete: boolean }>,
text: string,
isComplete: boolean,
): string | null {
// Handle backspaces at the start of text
if (text.includes("\b")) {
text = consumeLeadingBackspaces(lines, text);
}
// If there's still text to process and we have an incomplete line, append to it
if (text) {
const lastLine = lines.at(-1);
if (lastLine?.incomplete) {
const cleanText = processAnsiCodes(text);
Eif (cleanText) {
lastLine.text += cleanText;
lastLine.incomplete = !isComplete;
}
return null; // already handled
}
}
// No text left after backspace processing, or no incomplete line to append to
if (!text) {
return null;
}
// Text remains: caller should handle it (new line or other processing)
return text;
}
function hasControlChars(text: string) {
return {
hasClearScreen: text.includes("\x1b[2J") || text.includes("\u001b[2J"),
hasCursorHome: text.includes("\x1b[H") || text.includes("\u001b[H"),
hasCarriageReturn: text.includes("\r"),
};
}
/**
* Handles carriage-return overwrite logic for a single output line.
* Returns true if the line was fully handled (caller should skip normal processing).
*/
function processCarriageReturnLine(
lines: ProcessedLine[],
text: string,
lineComplete: boolean,
): boolean {
const parts = text.split("\r");
const cleanParts = parts.map((p) => processAnsiCodes(p));
Iif (cleanParts.length <= 1) return false;
const finalText = cleanParts.at(-1) ?? "";
const lastLine = lines.at(-1);
Iif (lastLine?.incomplete) {
lines[lines.length - 1] = { text: finalText, incomplete: !lineComplete };
} else {
lines.push({ text: finalText, incomplete: !lineComplete });
}
return true;
}
function processLineWithControls(
lines: ProcessedLine[],
text: string,
controls: ReturnType<typeof hasControlChars>,
shouldClear: boolean,
lineComplete: boolean,
): { text: string; shouldClear: boolean; handled: boolean } {
let newShouldClear = shouldClear;
let newText = text;
if (controls.hasClearScreen) {
newShouldClear = true;
lines.length = 0;
}
if (controls.hasCursorHome && newShouldClear) {
lines.length = 0;
newShouldClear = false;
}
const backspaceResult = applyBackspaceAcrossLines(lines, newText, lineComplete);
Iif (backspaceResult === null) {
return { text: "", shouldClear: newShouldClear, handled: true };
}
newText = backspaceResult;
if (controls.hasCarriageReturn && processCarriageReturnLine(lines, newText, lineComplete)) {
return { text: "", shouldClear: newShouldClear, handled: true };
}
return { text: newText, shouldClear: newShouldClear, handled: false };
}
export function SerialMonitor({
output,
isConnected: _isConnected,
isSimulationRunning: _isSimulationRunning = false,
onSendMessage: _onSendMessage,
onClear: _onClear,
showMonitor = true,
autoScrollEnabled = true,
headerActions,
showHeader = true,
}: SerialMonitorProps) {
const outputRef = useRef<HTMLDivElement | null>(null);
const containerRef = useRef<HTMLDivElement | null>(null);
const shouldAutoScrollRef = useRef(true);
const lastScrollTopRef = useRef(0);
const [scrollTop, setScrollTop] = useState(0);
const [containerHeight, setContainerHeight] = useState(600); // Default height
const rafIdRef = useRef<number | null>(null);
useEffect(() => {
// enable/disable autoscroll according to parent prop
shouldAutoScrollRef.current = !!autoScrollEnabled;
}, [autoScrollEnabled]);
// Measure container height for virtual scrolling
useEffect(() => {
Iif (!containerRef.current) return;
// Check if ResizeObserver is available (not available in some test environments)
Eif (globalThis.ResizeObserver === undefined) {
setContainerHeight(600); // Fallback height for tests
return;
}
const observer = new ResizeObserver((entries) => {
for (const entry of entries) {
setContainerHeight(entry.contentRect.height);
}
});
observer.observe(containerRef.current);
return () => observer.disconnect();
}, []);
// Process output lines with rAF batching
const processedLines = useMemo(() => {
const lines: ProcessedLine[] = [];
let shouldClear = false;
output.forEach((line) => {
let text = line.text;
const controls = hasControlChars(text);
const { text: processedText, shouldClear: newShouldClear, handled } = processLineWithControls(
lines,
text,
controls,
shouldClear,
line.complete ?? true,
);
shouldClear = newShouldClear;
if (!handled && processedText) {
const cleanText = processAnsiCodes(processedText);
if (cleanText) {
lines.push({ text: cleanText, incomplete: !line.complete });
}
}
});
return lines;
}, [output]);
// Calculate visible range for virtual scrolling
const { visibleLines, visibleStart, totalHeight, offsetY } = useMemo(() => {
Eif (!ENABLE_VIRTUAL_SCROLL || processedLines.length < 100) {
// Don't virtualize for small lists
return {
visibleLines: processedLines,
visibleStart: 0,
totalHeight: processedLines.length * ROW_HEIGHT,
offsetY: 0,
};
}
const visibleStart = Math.max(0, Math.floor(scrollTop / ROW_HEIGHT) - OVERSCAN_COUNT);
const visibleEnd = Math.min(
processedLines.length,
Math.ceil((scrollTop + containerHeight) / ROW_HEIGHT) + OVERSCAN_COUNT
);
return {
visibleLines: processedLines.slice(visibleStart, visibleEnd),
visibleStart,
totalHeight: processedLines.length * ROW_HEIGHT,
offsetY: visibleStart * ROW_HEIGHT,
};
}, [processedLines, scrollTop, containerHeight]);
// Render visible lines with rAF batching (disabled in tests for synchronous rendering)
useEffect(() => {
const el = outputRef.current;
if (!el) return;
const renderContent = () => {
el.innerHTML = "";
if (processedLines.length === 0) {
const placeholder = document.createElement("div");
placeholder.className = "text-muted-foreground italic";
placeholder.textContent = "Serial output will appear here...";
el.appendChild(placeholder);
I} else if (ENABLE_VIRTUAL_SCROLL && processedLines.length >= 100) {
// Virtual scrolling mode (only for large outputs)
const viewport = document.createElement("div");
viewport.style.height = `${totalHeight}px`;
viewport.style.position = "relative";
const content = document.createElement("div");
content.style.transform = `translateY(${offsetY}px)`;
content.style.willChange = "transform";
visibleLines.forEach((ln) => {
const div = document.createElement("div");
div.className = "text-foreground whitespace-pre-wrap break-words";
div.style.height = `${ROW_HEIGHT}px`;
div.style.lineHeight = `${ROW_HEIGHT}px`;
div.style.fontSize = "var(--fs-code-base)"; // Scales with global --ui-font-scale
div.textContent = ln.text;
content.appendChild(div);
});
viewport.appendChild(content);
el.appendChild(viewport);
} else {
// Standard rendering mode (for small outputs or when virtualization disabled)
processedLines.forEach((ln) => {
const div = document.createElement("div");
div.className = "text-foreground whitespace-pre-wrap break-words";
div.style.fontSize = "var(--fs-code-base)"; // Scales with global --ui-font-scale
div.style.lineHeight = "var(--lh-code-base)"; // Scales with global --ui-font-scale
div.textContent = ln.text;
el.appendChild(div);
});
}
// Auto-scroll to bottom if enabled
if (shouldAutoScrollRef.current && el) {
el.scrollTop = el.scrollHeight;
lastScrollTopRef.current = el.scrollTop;
}
};
// Use rAF batching in production, immediate rendering in tests
Iif (ENABLE_RAF_BATCHING) {
if (rafIdRef.current) {
cancelAnimationFrame(rafIdRef.current);
}
rafIdRef.current = requestAnimationFrame(() => {
renderContent();
rafIdRef.current = null;
});
} else {
renderContent();
}
}, [visibleLines, visibleStart, totalHeight, offsetY, processedLines]);
// Cleanup rAF on unmount
useEffect(() => {
return () => {
Iif (rafIdRef.current) {
cancelAnimationFrame(rafIdRef.current);
}
};
}, []);
const handleScroll = useCallback(() => {
const el = outputRef.current;
if (!el) return;
const currentScrollTop = el.scrollTop;
setScrollTop(currentScrollTop); // Update scroll position for virtual scrolling
const maxScrollTop = el.scrollHeight - el.clientHeight;
if (currentScrollTop < lastScrollTopRef.current - 5) {
shouldAutoScrollRef.current = false;
}
if (maxScrollTop - currentScrollTop < 20) {
shouldAutoScrollRef.current = true;
}
lastScrollTopRef.current = currentScrollTop;
}, []);
return (
<div className="h-full flex flex-col" data-testid="serial-monitor" ref={containerRef}>
{/* Header - Consistent with other panel headers */}
{showHeader && (
<div className="flex items-center justify-between px-[var(--header-padding-x)] h-[var(--ui-header-height)] bg-muted border-b border-border flex-shrink-0">
<div className="flex items-center gap-2">
<Monitor className="h-4 w-4 text-muted-foreground mr-1" strokeWidth={1.5} />
<span className="font-semibold tracking-wide uppercase text-muted-foreground/80" style={{ fontSize: "var(--fs-body-xs)" }}>Serial Monitor</span>
</div>
<div className="flex items-center gap-1">
{headerActions}
<Button
variant="ghost"
size="sm"
className="h-[var(--ui-button-height)] w-[var(--ui-button-height)] p-0 flex items-center justify-center"
onClick={() => _onClear()}
title="Clear serial output"
>
<Trash2 size={16} />
</Button>
</div>
</div>
)}
{/* Content area - flex-1 for remaining space */}
<div className="flex-1 min-h-0">
{showMonitor ? (
<ScrollArea
className="h-full"
viewportRef={outputRef}
viewportTestId="serial-output"
viewportProps={{ onScroll: handleScroll }}
viewportClassName="p-3 font-mono"
thumbClassName="bg-status-success"
/>
) : (
<div className="h-full" />
)}
</div>
</div>
);
}
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