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import {ClockEncoder} from '../../../../json-crdt-patch/codec/clock/ClockEncoder';
import {CrdtWriter} from '../../../../json-crdt-patch/util/binary/CrdtWriter';
import {type ITimestampStruct, Timestamp} from '../../../../json-crdt-patch/clock';
import {CborEncoder} from '@jsonjoy.com/json-pack/lib/cbor/CborEncoder';
import {SESSION} from '../../../../json-crdt-patch/constants';
import {CRDT_MAJOR_OVERLAY} from './constants';
import type {Model} from '../../../model';
export class Encoder extends CborEncoder<CrdtWriter> {
protected clockEncoder: ClockEncoder = new ClockEncoder();
protected time: number = 0;
protected doc!: Model;
constructor(writer?: CrdtWriter) {
super(writer || new CrdtWriter());
}
public encode(doc: Model<any>): Uint8Array {
this.doc = doc;
const writer = this.writer;
writer.reset();
if (doc.clock.sid === SESSION.SERVER) this.encodeServer(doc);
else this.encodeLogical(doc);
return writer.flush();
}
public encodeLogical(model: Model): void {
const writer = this.writer;
this.ts = this.tsLogical;
this.clockEncoder.reset(model.clock);
writer.ensureCapacity(4);
const x0 = writer.x0;
const x = writer.x;
writer.x += 4;
this.cRoot(model.root);
this.encodeClockTable(x0, x);
}
public encodeServer(model: Model): void {
this.ts = this.tsServer;
const writer = this.writer;
writer.u8(0b10000000);
writer.vu57((this.time = model.clock.time));
this.cRoot(model.root);
}
protected encodeClockTable(x0: number, x: number) {
const writer = this.writer;
const shift = writer.x0 - x0;
writer.view.setUint32(writer.x0 + (x - x0), writer.x - x - shift - 4);
const clockEncoder = this.clockEncoder!;
const table = clockEncoder.table;
const length = table.size;
writer.vu57(length);
table.forEach(this.cTableEntry);
}
protected readonly cTableEntry = (entry: {clock: ITimestampStruct}) => {
const clock = entry.clock;
const writer = this.writer;
writer.vu57(clock.sid);
writer.vu57(clock.time);
};
protected readonly tsLogical = (ts: ITimestampStruct): void => {
const relativeId = this.clockEncoder!.append(ts);
this.writer.id(relativeId.sessionIndex, relativeId.timeDiff);
};
protected readonly tsServer = (ts: ITimestampStruct): void => {
this.writer.vu57(ts.time);
};
protected ts: (ts: ITimestampStruct) => void = this.tsLogical;
protected cRoot(root: nodes.RootNode): void {
const val = root.val;
if (val.sid === SESSION.SYSTEM) this.writer.u8(0);
else this.cNode(root.node());
}
protected writeTL(majorOverlay: CRDT_MAJOR_OVERLAY, length: number): void {
const writer = this.writer;
if (length < 0b11111) writer.u8(majorOverlay | length);
else {
writer.u8(majorOverlay | 0b11111);
writer.vu57(length);
}
}
protected cNode(node: nodes.JsonNode): void {
// TODO: PERF: use a switch?
if (node instanceof nodes.ConNode) this.cCon(node);
else if (node instanceof nodes.ValNode) this.cVal(node);
else if (node instanceof nodes.StrNode) this.cStr(node);
else if (node instanceof nodes.ObjNode) this.cObj(node);
else if (node instanceof nodes.VecNode) this.cVec(node);
else if (node instanceof nodes.ArrNode) this.cArr(node);
else if (node instanceof nodes.BinNode) this.cBin(node);
}
protected cCon(node: nodes.ConNode): void {
const val = node.val;
this.ts(node.id);
if (val instanceof Timestamp) {
this.writer.u8(1); // this.writeTL(CRDT_MAJOR_OVERLAY.CON, 1);
this.ts(val as Timestamp);
} else {
this.writer.u8(0); // this.writeTL(CRDT_MAJOR_OVERLAY.CON, 0);
this.writeAny(val);
}
}
protected cVal(node: nodes.ValNode): void {
this.ts(node.id);
this.writer.u8(0b00100000); // this.writeTL(CRDT_MAJOR_OVERLAY.VAL, 0);
this.cNode(node.node());
}
protected cObj(node: nodes.ObjNode): void {
this.ts(node.id);
const keys = node.keys;
this.writeTL(CRDT_MAJOR_OVERLAY.OBJ, keys.size);
keys.forEach(this.cKey);
}
protected readonly cKey = (val: ITimestampStruct, key: string) => {
this.writeStr(key);
this.cNode(this.doc.index.get(val)!);
};
protected cVec(node: nodes.VecNode): void {
const elements = node.elements;
const length = elements.length;
this.ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.VEC, length);
const index = this.doc.index;
for (let i = 0; i < length; i++) {
const elementId = elements[i];
if (!elementId) this.writer.u8(0);
else this.cNode(index.get(elementId)!);
}
}
protected cStr(node: nodes.StrNode): void {
const ts = this.ts;
ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.STR, node.count);
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
if (chunk.del) this.writeUInteger(chunk.span);
else this.writeStr(chunk.data!);
}
}
protected cBin(node: nodes.BinNode): void {
const ts = this.ts;
const writer = this.writer;
ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.BIN, node.count);
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
const length = chunk.span;
const deleted = chunk.del;
writer.b1vu56(~~deleted as 0 | 1, length);
if (deleted) continue;
writer.buf(chunk.data!, length);
}
}
protected cArr(node: nodes.ArrNode): void {
const ts = this.ts;
const writer = this.writer;
ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.ARR, node.count);
const index = this.doc.index;
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
const span = chunk.span;
const deleted = chunk.del;
writer.b1vu56(~~deleted as 0 | 1, span);
if (deleted) continue;
const nodes = chunk.data!;
for (let i = 0; i < span; i++) this.cNode(index.get(nodes[i])!);
}
}
}
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