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import {fromBase64} from '@jsonjoy.com/base64/lib/fromBase64';
import {type ITimestampStruct, ts, ClockVector} from '../../../../json-crdt-patch/clock';
import {Model} from '../../../model';
import {SESSION} from '../../../../json-crdt-patch/constants';
import type * as types from './types';
export class Decoder {
public decode({time, root}: types.JsonCrdtVerboseDocument): Model {
const isServerClock = typeof time === 'number';
const doc = isServerClock ? Model.withServerClock(time) : Model.withLogicalClock(this.cClock(time));
this.cRoot(doc, root);
return doc;
}
protected cClock(timestamps: types.JsonCrdtVerboseLogicalTimestamp[]): ClockVector {
const [stamp] = timestamps;
const vectorClock = new ClockVector(stamp[0], stamp[1]);
const length = timestamps.length;
for (let i = 1; i < length; i++) {
const stamp = timestamps[i];
const [sessionId, time] = stamp;
vectorClock.observe(ts(sessionId, time), 1);
}
return vectorClock;
}
protected cTs(stamp: types.JsonCrdtVerboseTimestamp): ITimestampStruct {
const isServerClock = typeof stamp === 'number';
return isServerClock ? ts(SESSION.SERVER, stamp) : ts(stamp[0], stamp[1]);
}
protected cRoot(doc: Model, {value}: types.JsonCrdtVerboseVal): void {
const val = value ? this.cNode(doc, value) : new nodes.ConNode(doc.clock.tick(0), null);
const root = new nodes.RootNode(doc, val.id);
doc.root = root;
}
protected cNode(doc: Model, node: types.JsonCrdtNode): nodes.JsonNode {
switch (node.type) {
case 'obj':
return this.cObj(doc, node);
case 'arr':
return this.cArr(doc, node);
case 'str':
return this.cStr(doc, node);
case 'val':
return this.cVal(doc, node);
case 'con':
return this.cCon(doc, node);
case 'vec':
return this.cVec(doc, node);
case 'bin':
return this.cBin(doc, node);
}
throw new Error('UNKNOWN_NODE');
}
protected cObj(doc: Model, node: types.JsonCrdtVerboseObj): nodes.ObjNode {
const id = this.cTs(node.id);
const obj = new nodes.ObjNode(doc, id);
const map = node.map;
const keys = Object.keys(map);
for (const key of keys) {
const keyNode = map[key];
obj.put(key, this.cNode(doc, keyNode).id);
}
doc.index.set(id, obj);
return obj;
}
protected cVec(doc: Model, node: types.JsonCrdtVerboseVec): nodes.VecNode {
const id = this.cTs(node.id);
const obj = new nodes.VecNode(doc, id);
const elements = obj.elements;
const map = node.map;
const length = map.length;
for (let i = 0; i < length; i++) {
const component = map[i];
if (!component) elements.push(undefined);
else elements.push(this.cNode(doc, component).id);
}
doc.index.set(id, obj);
return obj;
}
protected cArr(doc: Model, node: types.JsonCrdtVerboseArr): nodes.ArrNode {
const id = this.cTs(node.id);
const rga = new nodes.ArrNode(doc, id);
const chunks = node.chunks;
const length = chunks.length;
if (length) {
let i = 0;
rga.ingest(length, () => {
const c = chunks[i++];
const id = this.cTs(c.id);
if (typeof (c as types.JsonCrdtVerboseTombstone).span === 'number')
return new nodes.ArrChunk(id, (c as types.JsonCrdtVerboseTombstone).span, undefined);
else {
const ids = (c as types.JsonCrdtVerboseArrChunk).value.map((n) => this.cNode(doc, n).id);
return new nodes.ArrChunk(id, ids.length, ids);
}
});
}
doc.index.set(id, rga);
return rga;
}
protected cStr(doc: Model, node: types.JsonCrdtVerboseStr): nodes.StrNode {
const id = this.cTs(node.id);
const rga = new nodes.StrNode(id);
const chunks = node.chunks;
const length = chunks.length;
if (length) {
let i = 0;
rga.ingest(length, () => {
const c = chunks[i++];
const id = this.cTs(c.id);
if (typeof (c as types.JsonCrdtVerboseTombstone).span === 'number')
return new nodes.StrChunk(id, (c as types.JsonCrdtVerboseTombstone).span, '');
else {
const value = (c as types.JsonCrdtVerboseStrChunk).value;
return new nodes.StrChunk(id, value.length, value);
}
});
}
doc.index.set(id, rga);
return rga;
}
protected cBin(doc: Model, node: types.JsonCrdtVerboseBin): nodes.BinNode {
const id = this.cTs(node.id);
const rga = new nodes.BinNode(id);
const chunks = node.chunks;
const length = chunks.length;
if (length) {
let i = 0;
rga.ingest(length, () => {
const c = chunks[i++];
const id = this.cTs(c.id);
if (typeof (c as types.JsonCrdtVerboseTombstone).span === 'number')
return new nodes.BinChunk(id, (c as types.JsonCrdtVerboseTombstone).span, undefined);
else {
const value = (c as types.JsonCrdtVerboseBinChunk).value;
const buf = fromBase64(value);
return new nodes.BinChunk(id, buf.length, buf);
}
});
}
doc.index.set(id, rga);
return rga;
}
protected cVal(doc: Model, node: types.JsonCrdtVerboseVal): nodes.ValNode {
const id = this.cTs(node.id);
const val = this.cNode(doc, node.value);
const obj = new nodes.ValNode(doc, id, val.id);
doc.index.set(id, obj);
return obj;
}
protected cCon(doc: Model, node: types.JsonCrdtVerboseCon): nodes.ConNode {
const id = this.cTs(node.id);
const val = node.timestamp ? this.cTs(node.value as types.JsonCrdtVerboseLogicalTimestamp) : node.value;
const obj = new nodes.ConNode(id, val);
doc.index.set(id, obj);
return obj;
}
}
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