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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 '../../structural/binary/constants';
import {sort} from '@jsonjoy.com/util/lib/sort/insertion';
import {UNDEFINED} from '../../../model/Model';
import type {Model} from '../../../model';
export class Encoder {
protected clockEncoder: ClockEncoder = new ClockEncoder();
protected time: number = 0;
protected doc!: Model;
protected readonly viewEncoder: CborEncoder<CrdtWriter> = new CborEncoder(new CrdtWriter());
protected readonly metaEncoder: CborEncoder<CrdtWriter> = new CborEncoder(new CrdtWriter());
protected index: number = 0;
public encode(doc: Model<any>): [view: Uint8Array, meta: Uint8Array] {
this.doc = doc;
this.index = 0;
this.metaEncoder.writer.reset();
this.encodeLogical(doc);
return [this.viewEncoder.writer.flush(), this.metaEncoder.writer.flush()];
}
public encodeLogical(model: Model): void {
const writer = this.metaEncoder.writer;
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);
}
protected encodeClockTable(x0: number, x: number) {
const writer = this.metaEncoder.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.metaEncoder.writer;
writer.vu57(clock.sid);
writer.vu57(clock.time);
};
protected readonly ts = (ts: ITimestampStruct): void => {
const relativeId = this.clockEncoder!.append(ts);
this.metaEncoder.writer.id(relativeId.sessionIndex, relativeId.timeDiff);
};
protected cRoot(root: nodes.RootNode): void {
const val = root.val;
Iif (val.sid === SESSION.SYSTEM) this.metaEncoder.writer.u8(0);
else this.cNode(root.node());
}
protected writeTL(majorOverlay: CRDT_MAJOR_OVERLAY, length: number): void {
const writer = this.metaEncoder.writer;
if (length < 24) writer.u8(majorOverlay + length);
else if (length <= 0xff) writer.u16(((majorOverlay + 24) << 8) + length);
else if (length <= 0xffff) writer.u8u16(majorOverlay + 25, length);
else Ewriter.u8u32(majorOverlay + 26, 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);
const metaEncoder = this.metaEncoder;
if (val instanceof Timestamp) {
this.viewEncoder.writeNull();
metaEncoder.writer.u8(1); // this.writeTL(CRDT_MAJOR_OVERLAY.CON, 1);
this.ts(val);
} else {
this.viewEncoder.writeAny(val);
metaEncoder.writer.u8(0); // this.writeTL(CRDT_MAJOR_OVERLAY.CON, 0);
}
}
protected cVal(node: nodes.ValNode): void {
this.ts(node.id);
this.metaEncoder.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 = sort([...node.keys.keys()]);
const size = keys.length;
this.writeTL(CRDT_MAJOR_OVERLAY.OBJ, size);
const viewEncoder = this.viewEncoder;
viewEncoder.writeObjHdr(size);
for (let i = 0; i < size; i++) {
const key = keys[i];
viewEncoder.writeStr(key);
this.cNode(node.get(key)!);
}
}
protected cVec(node: nodes.VecNode): void {
this.ts(node.id);
const elements = node.elements;
const length = elements.length;
this.writeTL(CRDT_MAJOR_OVERLAY.VEC, length);
this.viewEncoder.writeArrHdr(length);
const index = this.doc.index;
for (let i = 0; i < length; i++) {
const elementId = elements[i];
if (!elementId) this.cCon(UNDEFINED);
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);
this.viewEncoder.writeStr(node.view());
const writer = this.metaEncoder.writer;
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
writer.b1vu56(~~chunk.del as 0 | 1, chunk.span);
}
}
protected cBin(node: nodes.BinNode): void {
const ts = this.ts;
ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.BIN, node.count);
this.viewEncoder.writeBin(node.view());
const writer = this.metaEncoder.writer;
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
writer.b1vu56(~~chunk.del as 0 | 1, chunk.span);
}
}
protected cArr(node: nodes.ArrNode): void {
const ts = this.ts;
ts(node.id);
this.writeTL(CRDT_MAJOR_OVERLAY.ARR, node.count);
this.viewEncoder.writeArrHdr(node.length());
const writer = this.metaEncoder.writer;
const index = this.doc.index;
for (let chunk = node.first(); chunk; chunk = node.next(chunk)) {
ts(chunk.id);
const deleted = chunk.del;
const span = chunk.span;
writer.b1vu56(~~deleted as 0 | 1, span);
if (!deleted) {
const elements = chunk.data!;
const elementsLength = elements.length;
for (let i = 0; i < elementsLength; i++) this.cNode(index.get(elements[i])!);
}
}
}
}
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