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import functionPlot from "function-plot";
import { Box, TextField, Button, MenuItem, ToggleButton, ToggleButtonGroup, Typography, Alert, Stack } from "@mui/material";
import {
CALCULUS_MODES,
DEFAULT_VIEWPORT,
validateCalculusInput,
buildDerivativeConfig,
buildIntegralConfig,
definiteIntegral,
} from "./functionPlotConfig";
import { getAvailableExportFormats, canExport, exportCalculusGraph, buildExportFilename } from "./calculusExport";
/**
* EI-3152 — Calculus Visualization tool.
*
* Teacher enters f(x) and either a point x₀ (derivative → curve + tangent line)
* or bounds [a, b] (integral → curve + shaded area). A live function-plot preview
* renders on every valid change. Export is disabled until a format (SVG/PNG) is
* chosen (EI-TC-2654). `onInsert` receives the export payload + the calculus spec
* so the graph editor can embed it into the question.
*/
export default function CalculusPanel({ onInsert } = {}) {
const [mode, setMode] = useState(CALCULUS_MODES.DERIVATIVE);
const [fn, setFn] = useState("x^2");
const [x0, setX0] = useState("1");
const [a, setA] = useState("0");
const [b, setB] = useState("2");
const [format, setFormat] = useState(""); // empty → Export disabled (EI-TC-2654)
const [renderError, setRenderError] = useState(null);
const plotRef = useRef(null);
const validation = useMemo(() => validateCalculusInput({ mode, fn, x0, a, b }), [mode, fn, x0, a, b]);
const integralValue = useMemo(() => {
if (mode !== CALCULUS_MODES.INTEGRAL || !validation.valid) return null;
try {
return definiteIntegral(fn, a, b);
} catch {
return null;
}
}, [mode, fn, a, b, validation.valid]);
useEffect(() => {
const target = plotRef.current;
Iif (!target) return;
if (!validation.valid) {
target.innerHTML = "";
return;
}
try {
const cfg =
mode === CALCULUS_MODES.DERIVATIVE
? buildDerivativeConfig({ fn, x0 })
: buildIntegralConfig({ fn, a, b });
functionPlot({ ...cfg, target, width: 560, height: 360 });
setRenderError(null);
} catch {
setRenderError("Could not render this function — check the expression.");
}
}, [mode, fn, x0, a, b, validation.valid]);
const exportable = canExport(format) && validation.valid;
const handleExport = async () => {
if (!exportable) return;
const svg = plotRef.current?.querySelector("svg");
try {
const result = await exportCalculusGraph(svg, format, { width: 560, height: 360 });
onInsert?.({
...result,
filename: buildExportFilename(mode, format),
spec: {
type: "calculus",
mode,
fn,
point: { x0: Number(x0) },
bounds: { a: Number(a), b: Number(b) },
viewport: DEFAULT_VIEWPORT,
version: "1.0",
},
});
} catch {
setRenderError("Export failed — try again.");
}
};
return (
<Box id="calculus-panel" sx={{ p: 2 }}>
<Typography variant="h6" sx={{ mb: 1 }}>
Calculus Visualization
</Typography>
<ToggleButtonGroup
exclusive
value={mode}
onChange={(_e, v) => v && setMode(v)}
size="small"
sx={{ mb: 2 }}
>
<ToggleButton id="calculus-mode-derivative" value={CALCULUS_MODES.DERIVATIVE}>
Derivative
</ToggleButton>
<ToggleButton id="calculus-mode-integral" value={CALCULUS_MODES.INTEGRAL}>
Integral
</ToggleButton>
</ToggleButtonGroup>
<Stack direction="row" spacing={2} sx={{ mb: 2 }} flexWrap="wrap">
<TextField
id="calculus-fn-input"
label="f(x)"
value={fn}
onChange={(e) => setFn(e.target.value)}
inputProps={{ name: "fn" }}
size="small"
/>
{mode === CALCULUS_MODES.DERIVATIVE ? (
<TextField
id="calculus-x0-input"
label="Point x₀"
value={x0}
onChange={(e) => setX0(e.target.value)}
inputProps={{ name: "x0" }}
size="small"
/>
) : (
<>
<TextField
id="calculus-a-input"
label="Lower bound a"
value={a}
onChange={(e) => setA(e.target.value)}
inputProps={{ name: "a" }}
size="small"
/>
<TextField
id="calculus-b-input"
label="Upper bound b"
value={b}
onChange={(e) => setB(e.target.value)}
inputProps={{ name: "b" }}
size="small"
/>
</>
)}
</Stack>
{!validation.valid && (
<Alert id="calculus-validation-error" severity="warning" sx={{ mb: 2 }}>
{validation.error}
</Alert>
)}
{renderError && (
<Alert id="calculus-render-error" severity="error" sx={{ mb: 2 }}>
{renderError}
</Alert>
)}
{integralValue != null && (
<Typography id="calculus-integral-value" variant="body2" sx={{ mb: 1 }}>
∫ from {a} to {b} of {fn} dx ≈ {integralValue.toFixed(4)}
</Typography>
)}
<Box
id="calculus-plot"
ref={plotRef}
sx={{ border: "1px solid #e0e0e0", borderRadius: 1, minHeight: 360, mb: 2, bgcolor: "#fff" }}
/>
<Stack direction="row" spacing={2} alignItems="center">
<TextField
id="calculus-format-select"
select
label="Export format"
value={format}
onChange={(e) => setFormat(e.target.value)}
size="small"
sx={{ minWidth: 160 }}
inputProps={{ name: "format" }}
>
<MenuItem value="">
<em>Select a format…</em>
</MenuItem>
{getAvailableExportFormats().map((f) => (
<MenuItem key={f.value} value={f.value} id={`calculus-format-${f.value}`}>
{f.label}
</MenuItem>
))}
</TextField>
<Button
id="calculus-export-btn"
variant="contained"
disabled={!exportable}
onClick={handleExport}
>
Export
</Button>
</Stack>
</Box>
);
}
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