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import {ClockDecoder} from '../../../../json-crdt-patch/codec/clock/ClockDecoder';
import {type ITimestampStruct, Timestamp} from '../../../../json-crdt-patch/clock';
import {Model, UNDEFINED} from '../../../model/Model';
import {JsonCrdtDataType, SESSION} from '../../../../json-crdt-patch/constants';
import type * as t from './types';
export class Decoder {
protected time?: number;
protected clockDecoder?: ClockDecoder;
public decode(doc: t.JsonCrdtCompactDocument): Model {
const [time, root] = doc;
const isServerTime = typeof time === 'number';
if (isServerTime) {
this.time = time;
} else {
this.clockDecoder = ClockDecoder.fromArr(time as number[]);
}
const model = isServerTime
? Model.withServerClock(time as number)
: Model.withLogicalClock(this.clockDecoder!.clock);
const val = root ? this.decNode(model, root) : UNDEFINED;
model.root = new nodes.RootNode(model, val.id);
return model;
}
protected ts(x: t.JsonCrdtCompactTimestamp): ITimestampStruct {
if (typeof x === 'number') {
return new Timestamp(SESSION.SERVER, this.time! - x);
} else {
const [sid, time] = x as [number, number];
if (sid < 0) {
return this.clockDecoder!.decodeId(-sid, time);
} else E{
return new Timestamp(sid, time);
}
}
}
protected decNode(model: Model, node: t.JsonCrdtCompactNode): nodes.JsonNode {
switch (node[0]) {
case JsonCrdtDataType.con:
return this.decCon(model, node);
case JsonCrdtDataType.val:
return this.decVal(model, node);
case JsonCrdtDataType.obj:
return this.decObj(model, node);
case JsonCrdtDataType.vec:
return this.decVec(model, node);
case JsonCrdtDataType.str:
return this.decStr(model, node);
case JsonCrdtDataType.bin:
return this.decBin(model, node);
case JsonCrdtDataType.arr:
return this.decArr(model, node);
}
throw new Error('UNKNOWN_NODE');
}
protected decCon(doc: Model, node: t.JsonCrdtCompactCon): nodes.ConNode {
const id = this.ts(node[1]);
let data: unknown | undefined | Timestamp = node[2];
if (node.length > 3) {
const specialData = node[3] as unknown;
if (!specialData) data = undefined;
else data = this.ts(specialData as t.JsonCrdtCompactTimestamp);
}
const obj = new nodes.ConNode(id, data);
doc.index.set(id, obj);
return obj;
}
protected decVal(doc: Model, node: t.JsonCrdtCompactVal): nodes.ValNode {
const id = this.ts(node[1]);
const child = this.decNode(doc, node[2]);
const obj = new nodes.ValNode(doc, id, child.id);
doc.index.set(id, obj);
return obj;
}
protected decObj(model: Model, node: t.JsonCrdtCompactObj): nodes.ObjNode {
const id = this.ts(node[1]);
const obj = new nodes.ObjNode(model, id);
const map = node[2] as t.JsonCrdtCompactObj[2];
const keys = Object.keys(map);
const length = keys.length;
for (let i = 0; i < length; i++) {
const key = keys[i];
const val = this.decNode(model, map[key]);
obj.put(key, val.id);
}
model.index.set(id, obj);
return obj;
}
protected decVec(model: Model, node: t.JsonCrdtCompactVec): nodes.VecNode {
const id = this.ts(node[1]);
const obj = new nodes.VecNode(model, id);
const map = node[2] as t.JsonCrdtCompactVec[2];
const elements = obj.elements;
const length = map.length;
for (let i = 0; i < length; i++) {
const item = map[i];
if (!item) elements.push(undefined);
else {
const child = this.decNode(model, item);
elements.push(child.id);
}
}
model.index.set(id, obj);
return obj;
}
protected decStr(doc: Model, node: t.JsonCrdtCompactStr): nodes.StrNode {
const id = this.ts(node[1]);
const obj = new nodes.StrNode(id);
const chunks = node[2] as t.JsonCrdtCompactStr[2];
const size = chunks.length;
let i = 0;
obj.ingest(size, () => {
const chunk = chunks[i++];
const chunkId = this.ts(chunk[0]);
const content = chunk[1];
if (typeof content === 'number') return new nodes.StrChunk(chunkId, content, '');
return new nodes.StrChunk(chunkId, (content as string).length, content as string);
});
doc.index.set(id, obj);
return obj;
}
protected decBin(doc: Model, node: t.JsonCrdtCompactBin): nodes.BinNode {
const id = this.ts(node[1]);
const obj = new nodes.BinNode(id);
const chunks = node[2] as t.JsonCrdtCompactBin[2];
const size = chunks.length;
let i = 0;
obj.ingest(size, () => {
const chunk = chunks[i++];
const chunkId = this.ts(chunk[0]);
const content = chunk[1];
if (typeof content === 'number') return new nodes.BinChunk(chunkId, content, undefined);
return new nodes.BinChunk(chunkId, content.length, content);
});
doc.index.set(id, obj);
return obj;
}
protected decArr(doc: Model, node: t.JsonCrdtCompactArr): nodes.ArrNode {
const id = this.ts(node[1]);
const obj = new nodes.ArrNode(doc, id);
const chunks = node[2] as t.JsonCrdtCompactArr[2];
const size = chunks.length;
let i = 0;
obj.ingest(size, () => {
const chunk = chunks[i++];
const chunkId = this.ts(chunk[0]);
const content = chunk[1];
if (typeof content === 'number') return new nodes.ArrChunk(chunkId, content, undefined);
const ids = (content as t.JsonCrdtCompactNode[]).map((c) => this.decNode(doc, c).id);
return new nodes.ArrChunk(chunkId, content.length, ids);
});
doc.index.set(id, obj);
return obj;
}
}
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