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import {CrdtReader} from '../../../../json-crdt-patch/util/binary/CrdtReader';
import type {ITimestampStruct} from '../../../../json-crdt-patch/clock';
import {Model, UNDEFINED} from '../../../model/Model';
import {CborDecoderBase} from '@jsonjoy.com/json-pack/lib/cbor/CborDecoderBase';
import * as nodes from '../../../nodes';
import {CRDT_MAJOR} from '../../structural/binary/constants';
import {sort} from '@jsonjoy.com/util/lib/sort/insertion';
import {SESSION} from '../../../../json-crdt-patch/constants';
export class Decoder {
protected doc!: Model;
protected clockDecoder?: ClockDecoder = undefined;
protected time: number = -1;
protected readonly decoder: CborDecoderBase<CrdtReader> = new CborDecoderBase<CrdtReader>(new CrdtReader());
public decode(view: unknown, meta: Uint8Array): Model {
this.clockDecoder = undefined;
this.time = -1;
this.decoder.reader.reset(meta);
this.decodeClockTable();
const clock = this.clockDecoder!.clock;
this.doc = Model.withLogicalClock(clock);
this.doc.root = new nodes.RootNode(this.doc, this.cRoot(view).id);
this.clockDecoder = undefined;
return this.doc;
}
protected decodeClockTable(): void {
const reader = this.decoder.reader;
const clockTableOffset = reader.u32();
const offset = reader.x;
reader.x += clockTableOffset;
const length = reader.vu57();
const sessionId = reader.vu57();
const time = reader.vu57();
this.clockDecoder = new ClockDecoder(sessionId, time);
for (let i = 1; i < length; i++) {
const sid = reader.vu57();
const time = reader.vu57();
this.clockDecoder.pushTuple(sid, time);
}
reader.x = offset;
}
protected ts(): ITimestampStruct {
const decoderTime = this.time!;
const [sessionIndex, timeDiff] = this.decoder.reader.id();
return this.clockDecoder!.decodeId(sessionIndex, timeDiff);
}
protected cRoot(view: unknown): nodes.JsonNode {
const reader = this.decoder.reader;
const peek = reader.uint8[reader.x];
return !peek ? UNDEFINED : this.cNode(view);
}
protected cNode(view: unknown): nodes.JsonNode {
const reader = this.decoder.reader;
const id = this.ts();
const octet = reader.u8();
const major = octet >> 5;
const minor = octet & 0b11111;
const length = minor < 24 ? minor : minor === 24 ? reader.u8() : minor === 25 ? reader.u16() : reader.u32();
switch (major) {
case CRDT_MAJOR.CON:
return this.cCon(view, id, length);
case CRDT_MAJOR.VAL:
return this.cVal(view, id);
case CRDT_MAJOR.OBJ:
return this.cObj(view, id, length);
case CRDT_MAJOR.VEC:
return this.cVec(view, id, length);
case CRDT_MAJOR.STR:
return this.cStr(view, id, length);
case CRDT_MAJOR.BIN:
return this.cBin(view, id, length);
case CRDT_MAJOR.ARR:
return this.cArr(view, id, length);
}
throw new Error('UNKNOWN_NODE');
}
protected cCon(view: unknown, id: ITimestampStruct, length: number): nodes.ConNode {
const doc = this.doc;
const node = new nodes.ConNode(id, length ? this.ts() : view);
doc.index.set(id, node);
return node;
}
protected cVal(view: unknown, id: ITimestampStruct): nodes.ValNode {
const child = this.cNode(view);
const doc = this.doc;
const node = new nodes.ValNode(doc, id, child.id);
doc.index.set(id, node);
return node;
}
protected cObj(view: unknown, id: ITimestampStruct, length: number): nodes.ObjNode {
const obj = new nodes.ObjNode(this.doc, id);
Iif (!view || typeof view !== 'object') throw new Error('INVALID_OBJ');
const keys = sort(Object.keys(view));
Iif (keys.length !== length) throw new Error('INVALID_OBJ');
const objKeys = obj.keys;
for (let i = 0; i < length; i++) {
const key = keys[i];
const childNode = this.cNode((view as any)[key]);
objKeys.set(key, childNode.id);
}
this.doc.index.set(id, obj);
return obj;
}
protected cVec(view: unknown, id: ITimestampStruct, length: number): nodes.VecNode {
const obj = new nodes.VecNode(this.doc, id);
Iif (!Array.isArray(view) || view.length !== length) throw new Error('INVALID_VEC');
const elements = obj.elements;
const reader = this.decoder.reader;
for (let i = 0; i < length; i++) {
const child = this.cNode(view[i]);
const childId = child.id;
if (childId.sid === SESSION.SYSTEM) elements.push(undefined);
else elements.push(childId);
}
this.doc.index.set(id, obj);
return obj;
}
protected cStr(view: unknown, id: ITimestampStruct, length: number): nodes.StrNode {
Iif (typeof view !== 'string') throw new Error('INVALID_STR');
const node = new nodes.StrNode(id);
const reader = this.decoder.reader;
let offset = 0;
node.ingest(length, (): nodes.StrChunk => {
const id = this.ts();
const [deleted, span] = reader.b1vu56();
if (deleted) return new nodes.StrChunk(id, span, '');
const text = view.slice(offset, offset + span);
offset += span;
return new nodes.StrChunk(id, text.length, text);
});
this.doc.index.set(id, node);
return node;
}
protected cBin(view: unknown, id: ITimestampStruct, length: number): nodes.BinNode {
Iif (!(view instanceof Uint8Array)) throw new Error('INVALID_BIN');
const node = new nodes.BinNode(id);
const reader = this.decoder.reader;
let offset = 0;
node.ingest(length, (): nodes.BinChunk => {
const id = this.ts();
const [deleted, span] = reader.b1vu56();
if (deleted) return new nodes.BinChunk(id, span, undefined);
const slice = view.slice(offset, offset + span);
offset += span;
return new nodes.BinChunk(id, slice.length, slice);
});
this.doc.index.set(id, node);
return node;
}
protected cArr(view: unknown, id: ITimestampStruct, length: number): nodes.ArrNode {
Iif (!Array.isArray(view)) throw new Error('INVALID_ARR');
const obj = new nodes.ArrNode(this.doc, id);
const reader = this.decoder.reader;
let i = 0;
obj.ingest(length, (): nodes.ArrChunk => {
const id = this.ts();
const [deleted, span] = reader.b1vu56();
if (deleted) return new nodes.ArrChunk(id, span, undefined);
const ids: ITimestampStruct[] = [];
for (let j = 0; j < span; j++) ids.push(this.cNode(view[i++]).id);
return new nodes.ArrChunk(id, span, ids);
});
this.doc.index.set(id, obj);
return obj;
}
}
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