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import type { OutputLine } from "@shared/schema";
import { SerialCharacterRenderer } from "@/utils/serial-character-renderer";
import { emitSerialOutput } from "./use-external-api";
export function useSerialIO() {
const [serialOutput, setSerialOutput] = useState<OutputLine[]>([]);
const [serialViewMode, setSerialViewMode] = useState<"monitor" | "plotter" | "both">("monitor");
const [autoScrollEnabled, setAutoScrollEnabled] = useState<boolean>(true);
const [serialInputValue, setSerialInputValue] = useState("");
// Baudrate-simulated rendering
const [renderedSerialText, setRenderedSerialText] = useState<string>("");
const rendererRef = useRef<SerialCharacterRenderer | null>(null);
const emitDebounceRef = useRef<NodeJS.Timeout | null>(null);
const pendingOutputRef = useRef<string>("");
// Convert renderedSerialText to OutputLine[] format for SerialMonitor
const renderedSerialOutput = useMemo<OutputLine[]>(() => {
if (!renderedSerialText) return [];
const lines = renderedSerialText.split('\n');
return lines.map((line, index) => ({
text: line,
complete: index < lines.length - 1, // All lines except last are complete
}));
}, [renderedSerialText]);
// Initialize renderer once and cleanup on unmount
useEffect(() => {
const renderer = new SerialCharacterRenderer((char: string) => {
setRenderedSerialText((prev) => prev + char);
});
rendererRef.current = renderer;
return () => {
renderer.clear();
// Clean up debounce timer on unmount
if (emitDebounceRef.current !== null) {
clearTimeout(emitDebounceRef.current);
}
};
}, []);
const showSerialMonitor = serialViewMode !== "plotter";
const showSerialPlotter = serialViewMode !== "monitor";
const cycleSerialViewMode = useCallback(() => {
setSerialViewMode((prev) => {
if (prev === "monitor") return "both";
if (prev === "both") return "plotter";
return "monitor";
});
}, []);
const clearSerialOutput = useCallback(() => {
setSerialOutput([]);
Eif (rendererRef.current) {
rendererRef.current.clear();
// Re-enable rendering so the next serial output is displayed.
// clear() pauses the renderer (to stop current animation), but we must
// resume() so that data arriving after the clear is not silently dropped.
rendererRef.current.resume();
}
setRenderedSerialText("");
// Clean up any pending debounced emit
Iif (emitDebounceRef.current !== null) {
clearTimeout(emitDebounceRef.current);
emitDebounceRef.current = null;
}
pendingOutputRef.current = "";
}, []);
// Baudrate rendering methods
const appendSerialOutput = useCallback((text: string) => {
const isTestMode =
globalThis.window !== undefined && (globalThis as any).__PLAYWRIGHT_TEST__;
if (isTestMode) {
// in tests we bypass baudrate rendering to make output appear instantly
setRenderedSerialText((prev) => prev + text);
} else {
rendererRef.current?.enqueue(text);
}
// Emit serial output event to parent frame for dashboard monitoring (debounced to 100ms)
pendingOutputRef.current += text;
Iif (emitDebounceRef.current !== null) {
clearTimeout(emitDebounceRef.current);
}
emitDebounceRef.current = setTimeout(() => {
Eif (pendingOutputRef.current) {
emitSerialOutput(pendingOutputRef.current);
pendingOutputRef.current = "";
}
emitDebounceRef.current = null;
}, 100);
}, []);
const setBaudrate = useCallback((baud: number | undefined) => {
const isTestMode =
globalThis.window !== undefined && (globalThis as any).__PLAYWRIGHT_TEST__;
rendererRef.current?.setBaudrate(isTestMode ? 0 : baud);
}, []);
const pauseRendering = useCallback(() => {
rendererRef.current?.pause();
}, []);
const resumeRendering = useCallback(() => {
rendererRef.current?.resume();
}, []);
/**
* Stop rendering and clear the renderer queue.
* Used on STOP to prevent old data from leaking into the next simulation.
* Unlike pauseRendering(), this discards all pending characters.
*/
const stopRendering = useCallback(() => {
rendererRef.current?.clear();
}, []);
/**
* Inject text directly into rendered output, bypassing the baudrate renderer.
* Used for system messages ("--- Simulation paused ---" etc.) that must
* appear instantly regardless of baudrate.
*/
const appendRenderedText = useCallback((text: string) => {
setRenderedSerialText((prev) => {
// Ensure injected text starts on a new line if current output
// doesn't end with one (e.g., partial serial line was rendering)
if (prev.length > 0 && !prev.endsWith('\n')) {
return prev + '\n' + text;
}
return prev + text;
});
}, []);
return {
// Existing API (unchanged - for backward compatibility and Plotter)
serialOutput,
setSerialOutput,
serialViewMode,
setSerialViewMode,
autoScrollEnabled,
setAutoScrollEnabled,
serialInputValue,
setSerialInputValue,
showSerialMonitor,
showSerialPlotter,
cycleSerialViewMode,
clearSerialOutput,
// New baudrate rendering API
renderedSerialText,
renderedSerialOutput, // OutputLine[] format for SerialMonitor
appendSerialOutput,
setBaudrate,
pauseRendering,
resumeRendering,
stopRendering,
appendRenderedText,
};
}
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