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import l10n from "shared/lib/lang/l10n";
import styled from "styled-components";
import { CheckboxField } from "ui/form/CheckboxField";
import { Knob } from "ui/form/Knob";
import { Label } from "ui/form/Label";
interface InstrumentWaveEnvelopeEditorProps {
volume: number;
length: number | null;
onChangeVolume: (value: number) => void;
onChangeLength: (value: number | null) => void;
}
const StyledEnvelopeForm = styled.div`
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 5px;
align-items: end;
padding: 0 10px;
padding-bottom: 10px;
`;
const StyledEnvelopeField = styled.div`
display: grid;
grid-template-rows: 1fr auto;
gap: 6px;
> *:first-child {
align-self: end;
align-items: center;
text-align: center;
justify-content: center;
height: auto;
}
&:first-child > *:first-child {
position: relative;
top: -1px;
}
> *:last-child {
width: 100%;
}
`;
const mapInput = (input: number): number => {
Iif (input === 0) {
return 0;
} else if (input === 1) {
return 100;
} else Eif (input === 2) {
return 50;
} else {
return 25;
}
};
const waveVolumeDisplays = [0, 25, 50, 100] as const;
const waveVolumeDisplayToStored = {
0: 0,
25: 3,
50: 2,
100: 1,
} as const;
const mapDisplayValueToStoredVolume = (
value: number,
currentDisplayValue: number,
): number => {
const closestDisplayValue = waveVolumeDisplays.reduce(
(closest, candidate) => {
const closestDistance = Math.abs(value - closest);
const candidateDistance = Math.abs(value - candidate);
if (candidateDistance !== closestDistance) {
return candidateDistance < closestDistance ? candidate : closest;
}
Iif (value > currentDisplayValue) {
return candidate;
}
return closest;
},
);
return waveVolumeDisplayToStored[closestDisplayValue];
};
export const InstrumentWaveEnvelopeEditor = ({
volume,
length,
onChangeVolume,
onChangeLength,
}: InstrumentWaveEnvelopeEditorProps) => {
const lastRequestedDisplayValueRef = useRef(mapInput(volume));
const lastResolvedStoredVolumeRef = useRef(volume);
useEffect(() => {
lastResolvedStoredVolumeRef.current = volume;
}, [volume]);
const fixedOnChangeVolume = useCallback(
(value: number) => {
const previousRequestedDisplayValue =
lastRequestedDisplayValueRef.current;
const nextStoredVolume =
value === 75 && previousRequestedDisplayValue === 75
? lastResolvedStoredVolumeRef.current
: mapDisplayValueToStoredVolume(value, previousRequestedDisplayValue);
lastRequestedDisplayValueRef.current = value;
lastResolvedStoredVolumeRef.current = nextStoredVolume;
onChangeVolume(nextStoredVolume);
},
[onChangeVolume],
);
const formatValue = useCallback(() => {
return `${mapInput(lastResolvedStoredVolumeRef.current)}%`;
}, []);
return (
<StyledEnvelopeForm>
<StyledEnvelopeField>
<CheckboxField
label={l10n("FIELD_LENGTH")}
name="length"
checked={length !== null}
onChange={(e) => {
const value = e.target.checked;
if (!value) {
onChangeLength(null);
} else {
onChangeLength(32);
}
}}
/>
<Knob
name="length"
value={length ?? 0}
min={1}
max={256}
onChange={onChangeLength}
/>
</StyledEnvelopeField>
<StyledEnvelopeField>
<Label htmlFor="initialVolume">{l10n("FIELD_VOLUME")}</Label>
<Knob
name="initialVolume"
value={mapInput(volume)}
min={0}
max={100}
step={25}
onChange={fixedOnChangeVolume}
formatValue={formatValue}
/>
</StyledEnvelopeField>
</StyledEnvelopeForm>
);
};
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