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OCTAVE_SIZE,
TRACKER_CHANNEL_FIELDS,
TRACKER_NUM_CHANNELS,
TRACKER_PATTERN_LENGTH,
TRACKER_ROW_SIZE,
} from "consts";
import { createPatternCell } from "shared/lib/uge/song";
import { Pattern, PatternCell, SequenceItem, Song } from "shared/lib/uge/types";
import { toValidChannelId } from "shared/lib/uge/editor/helpers";
import { transposeNoteValue } from "shared/lib/uge/display";
interface AbsRowPosition {
sequenceId: number;
rowId: number;
}
/** Converts a (sequenceId, rowId) pair to a single absolute row index. */
export const toAbsRow = (sequenceId: number, rowId: number) =>
sequenceId * TRACKER_PATTERN_LENGTH + rowId;
/** Splits an absolute row index back into its (sequenceId, rowId) components. */
export const fromAbsRow = (absRow: number): AbsRowPosition => ({
sequenceId: Math.floor(absRow / TRACKER_PATTERN_LENGTH),
rowId: absRow % TRACKER_PATTERN_LENGTH,
});
interface ResolvedAbsRow extends AbsRowPosition {
patternId: number;
}
/**
* Resolves an absolute row index against the song sequence, returning the
* sequenceId, rowId, and patternId. Returns null when the sequence slot is
* out of bounds.
*/
export const resolveAbsRow = (
sequence: SequenceItem[],
absRow: number,
channelId: number,
): ResolvedAbsRow | null => {
const { sequenceId, rowId } = fromAbsRow(absRow);
const patternId = sequence[sequenceId]?.channels[channelId];
if (patternId === undefined) {
return null;
}
return { sequenceId, rowId, patternId };
};
export const getPatternBlockCount = (patterns: Pattern[] | undefined): number =>
Math.ceil((patterns?.length ?? 0) / TRACKER_NUM_CHANNELS);
export const getSequenceChannelPatternId = (
song: Song,
sequenceId: number,
channelId: number,
): number | undefined => song.sequence[sequenceId]?.channels[channelId];
export const getSequenceChannelCell = (
song: Song,
sequenceId: number,
channelId: number,
rowId: number,
): { patternId: number; cell: PatternCell } | null => {
const patternId = getSequenceChannelPatternId(song, sequenceId, channelId);
Iif (patternId === undefined) {
return null;
}
const cell = song.patterns[patternId]?.[rowId];
Iif (!cell) {
return null;
}
return { patternId, cell };
};
export const createPatternMatrix = (): PatternCell[][] =>
Array.from({ length: TRACKER_PATTERN_LENGTH }, () => [
createPatternCell(),
createPatternCell(),
createPatternCell(),
createPatternCell(),
]);
export const buildSequencePattern = (
song: Song,
sequenceId: number,
): PatternCell[][] => {
const pattern = createPatternMatrix();
for (let rowId = 0; rowId < TRACKER_PATTERN_LENGTH; rowId++) {
for (let channelId = 0; channelId < TRACKER_NUM_CHANNELS; channelId++) {
const resolved = getSequenceChannelCell(
song,
sequenceId,
channelId,
rowId,
);
pattern[rowId][channelId] = resolved
? { ...resolved.cell }
: createPatternCell();
}
}
return pattern;
};
interface ResolvedTrackerPosition {
rowIndex: number;
channelIndex: 0 | 1 | 2 | 3;
}
interface ResolvedTrackerPositionField extends ResolvedTrackerPosition {
fieldIndex: number;
}
export const resolveUniqueTrackerPositions = (
selectedTrackerFields: number[],
): ResolvedTrackerPosition[] => {
const seen = new Set<string>();
const resolvedCells: ResolvedTrackerPosition[] = [];
for (const field of selectedTrackerFields) {
const rowIndex = Math.floor(field / TRACKER_ROW_SIZE);
const channelIndex = toValidChannelId(
Math.floor(field / TRACKER_CHANNEL_FIELDS) % TRACKER_NUM_CHANNELS,
);
const key = `${rowIndex}:${channelIndex}`;
if (seen.has(key)) {
continue;
}
seen.add(key);
resolvedCells.push({
rowIndex,
channelIndex,
});
}
return resolvedCells;
};
export const resolveTrackerFieldPositions = (
selectedTrackerFields: number[],
): ResolvedTrackerPositionField[] => {
const seen = new Set<string>();
const resolvedCells: ResolvedTrackerPositionField[] = [];
for (const field of selectedTrackerFields) {
const rowIndex = Math.floor(field / TRACKER_ROW_SIZE);
const channelIndex = toValidChannelId(
Math.floor(field / TRACKER_CHANNEL_FIELDS) % TRACKER_NUM_CHANNELS,
);
const fieldIndex = field % TRACKER_CHANNEL_FIELDS;
const key = `${rowIndex}:${channelIndex}:${fieldIndex}`;
Iif (seen.has(key)) {
continue;
}
seen.add(key);
resolvedCells.push({
rowIndex,
channelIndex,
fieldIndex,
});
}
return resolvedCells;
};
/**
* Mutates a PatternCell's note in-place by transposing it by `noteDelta`
* semitones. No-ops when the cell is undefined or its note is null.
*/
export const transposePatternCellNote = (
cell: PatternCell | undefined,
noteDelta: number,
) => {
if (!cell) {
return;
}
if (cell.note === null) {
return;
}
cell.note = transposeNoteValue(cell.note, noteDelta);
};
/**
* Returns the semitone delta for a transpose operation.
* "octave" uses ±12 semitones; "note" uses ±1.
*/
export const getTransposeNoteDelta = (
direction: "up" | "down",
size: "note" | "octave",
) => {
const deltaBase = direction === "up" ? 1 : -1;
return size === "octave" ? deltaBase * OCTAVE_SIZE : deltaBase;
};
interface ResolvedTrackerCell {
patternId: number;
rowIndex: number;
channelIndex: 0 | 1 | 2 | 3;
}
/**
* Converts a list of tracker field indices into unique (patternId, rowIndex,
* channelIndex) tuples, deduplicating fields that map to the same cell.
*/
export const resolveUniqueTrackerCells = (
patternId: number,
selectedTrackerFields: number[],
): ResolvedTrackerCell[] => {
const seen = new Set<string>();
const resolvedCells: ResolvedTrackerCell[] = [];
for (const field of selectedTrackerFields) {
const rowIndex = Math.floor(field / TRACKER_ROW_SIZE);
const channelIndex = toValidChannelId(
Math.floor(field / TRACKER_CHANNEL_FIELDS) % TRACKER_NUM_CHANNELS,
);
const key = `${patternId}:${rowIndex}:${channelIndex}`;
if (seen.has(key)) {
continue;
}
seen.add(key);
resolvedCells.push({
patternId,
rowIndex,
channelIndex,
});
}
return resolvedCells;
};
interface ResolvedTrackerCellField {
patternId: number;
rowIndex: number;
channelIndex: number;
fieldIndex: number;
}
/**
* Converts a list of tracker field indices into unique (patternId, rowIndex,
* channelIndex, fieldIndex) tuples, preserving individual cell field granularity
* and deduplicating exact field positions.
*/
export const resolveTrackerCellFields = (
patternId: number,
selectedTrackerFields: number[],
): ResolvedTrackerCellField[] => {
const seen = new Set<string>();
const resolvedCells: ResolvedTrackerCellField[] = [];
for (const field of selectedTrackerFields) {
const rowIndex = Math.floor(field / TRACKER_ROW_SIZE);
const channelIndex =
Math.floor(field / TRACKER_CHANNEL_FIELDS) % TRACKER_NUM_CHANNELS;
const fieldIndex = field % TRACKER_CHANNEL_FIELDS;
const key = `${patternId}:${rowIndex}:${channelIndex}:${fieldIndex}`;
if (seen.has(key)) {
continue;
}
seen.add(key);
resolvedCells.push({
patternId,
rowIndex,
channelIndex,
fieldIndex,
});
}
return resolvedCells;
};
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